CN104852344A - Electric connection/lap joint component of European-style cable branch box - Google Patents

Abstract

The invention discloses a European-style cable branch box live connection/lapping member, which includes at least one butt joint and lead joint, several continuous joints and a sealing joint, and the butt joint, lead joint and sealing joint are connected in sequence to form a branch connection/ The overlapping components or the adjacent lead joints are connected by continuous joints and butt joints, the front end of the first lead joint is connected to the butt joint, and the rear end of the last lead joint is connected to the sealing joint to form a multi-branch connection/lap joint member; The joints are integral parts integrating the internal conductor and the external hard insulating sleeve. The connection ends of the internal conductors of each joint adopt a threaded connection structure. In the arc extinguishing chamber. After the joints are connected, the inner conductors are connected as a whole, and the outside is insulated and sealed by a hard insulating sleeve. When connecting, the operator contacts are all hard insulators. It can realize the continuous expansion of multiple continuous joints and lead joints.

Description

European-style cable branch box with electrical connection/bonding member

technical field

The present invention relates to a European-style cable branch box connector, in particular to a European-style cable branch box live connection/lapping member.

Background technique

The current European-style cable branch box uses the wall bushing as the connecting busbar, and then realizes cable branching or transfer through the connecting member connected with the wall bushing. However, at present, the metal conductors in the butt joints, lead joints and other joints of the connecting members are separate from the external insulator, and there are the following problems when connecting: (1) The connection between the conductor part and the external insulating part needs to be carried out one by one. It is cumbersome; (2) When connecting, the power must be cut off, and the live connection cannot be made, which will affect the reliability of power supply and cause economic losses.

Contents of the invention

The object of the present invention is to provide a European-style cable branch box live connection/lapping member which is easy to operate and can connect branch wires live.

The invention discloses a live connection/lap joint member of a European-style cable branch box, comprising at least one butt joint and a lead joint, several continuous joints and a sealing joint, and the butt joints, lead joints and sealing joints are sequentially connected to form a branch connection assembly or Adjacent lead joints are connected by continuous joints and butt joints. The front end of the first lead joint is connected to the butt joint, and the rear end of the last lead joint is connected to the sealing joint to form a multi-branch connection assembly; each joint is an internal conductor and an external conductor. The integral part of the hard insulating sleeve is integrated, and the connection ends of the internal conductors of each joint adopt a threaded connection structure; after the joints are connected, the internal conductors are connected as a whole, and the outside is insulated and sealed by the hard insulating sleeve; when installing and disassembling, rotate the butt joint Or continue the connector.

The structures of butt joints, lead joints, extension joints and sealing joints are as follows: said butt joints include butt joint internal conductors and butt joint hard insulating sleeves, butt joint internal conductors are the front section screw and the rear section screw with opposite screw threads at both ends. The overall part of the tube, the outer diameter of the coil section is larger than the outer diameter of the screw section, and the outer wall has a convex positioning ring, the hard insulating sleeve of the butt joint is tapered conical, the front section is a conical arc extinguishing chamber, and the rear section is cylindrical In the arc extinguishing chamber, the middle section of the outer wall of the hard insulating sleeve of the butt joint is a wrench holding section; the length of the screw section of the internal conductor of the butt joint is less than the depth of the conical arc extinguishing chamber, and the internal conductor of the butt joint extends into the conical arc extinguishing chamber with the screw section The indoor and coil sections are located in the cylindrical arc extinguishing chamber and embedded in the axial center of the hard insulating sleeve of the butt joint; the lead joint includes the inner conductor of the lead joint and the hard insulating sleeve of the butt joint; the inner conductor of the lead joint is threaded at both ends The integral part of the front screw and the rear coil in the opposite direction of rotation, the outer diameter of the coil segment is larger than the outer diameter of the screw segment, and the outer wall has an outwardly protruding positioning ring, and the hard insulating sleeve of the lead joint is a T-shaped three-way sleeve. Its upper end casing is tapered conical with an axial central through hole inside. The front section of the through hole is an arc extinguishing chamber matching the rear section of the hard insulating sleeve of the butt joint, and the rear section is a round hole. There is a positioning groove on the upper side of the hole wall for the positioning of the terminal. The outer wall of the lower end of the T-shaped tee bushing is screwed to a hard insulating cover. The length of the screw of the inner conductor of the lead joint is less than the depth of the conical interrupter. The internal conductor of the lead joint extends into the arc extinguishing chamber with a screw section, and is embedded in the front of the positioning groove on the upper side of the axial through hole in the upper sleeve body; the continuous joint includes the internal conductor of the continuous joint and the hard insulating sleeve of the continuous joint. The internal conductor is an integral part of the front screw and the rear coil with opposite screw threads at both ends. The outer diameter of the screw tube is larger than the outer diameter of the screw segment, and the outer wall has an outwardly protruding positioning ring. The hard insulating sleeve of the continuous joint is tapered. The middle section of the outer wall is a wrench clamping section, the internal conductor of the continuous joint extends from the front end of the hard insulating sleeve of the continuous joint with the screw section and the front part of the coil section, and the rear end of the spiral tube section is flat with the rear end of the hard insulating sleeve of the continuous joint Embedded in the axial center of the hard insulating sleeve of the continuous joint, the front end of the hard insulating sleeve of the continuous joint has a groove corresponding to the outer diameter of the inner conductor boss section; the sealing joint includes the internal conductor of the sealing joint and the sealing joint Rigid insulating sleeve, the internal conductor of the sealing head is embedded in the axial center of the sealing head’s rigid insulating sleeve; the internal conductor of the sealing head includes the screw section and the straight rod section at the rear end, and the outer wall of the straight rod section has an outwardly protruding positioning ring. The front part of the screw section and the straight rod section protrude out of the front end of the hard insulating sleeve of the sealing head, and the axial center of the hard insulating sleeve of the sealing head has a blind hole from the front end to the rear for installing the inner conductor of the sealing head. The rear end of the outer wall of the insulating sleeve is a hexagonal wrench clamping section, and the front end of the hard insulating sleeve of the sealing joint has a groove corresponding to the outer diameter of the inner conductor boss section.

Or the structure of the butt joint, the lead joint, the extension joint and the sealing joint is as follows: the butt joint includes the inner conductor of the butt joint and the hard insulating sleeve of the butt joint, and the inner conductor of the butt joint is a double-ended screw with opposite screw threads at both ends , the middle section is a cylindrical section whose outer diameter is larger than the outer diameter of the two ends of the screw, and the outer wall of the cylindrical section has a convex positioning ring; the two ends of the double-ended screw are covered with rubber pads; the two ends of the hard insulating sleeve of the butt joint Both are conical arc extinguishing chambers, and the middle section is a concave spanner holding section; the length of the screw section of the inner conductor of the butt joint is less than the depth of the conical arc extinguishing chamber, and the cylindrical section of the inner conductor of the butt joint corresponds to the hard insulating sleeve of the butt joint The middle section and the screw rods at both ends extend into the corresponding conical arc extinguishing chamber and are embedded in its axial center; the lead joint includes the inner conductor of the lead joint and the hard insulating sleeve of the butt joint; the inner conductor of the lead joint is connected to the pair The two ends of the internal conductor of the joint are matched with internally threaded tubes with opposite screw threads. The outer wall has a convex positioning ring. The hard insulating sleeve of the lead joint is a T-shaped three-way sleeve. The rear part of the insulating sleeve is matched with a gradually expanding conical shape, and the upper side of the inner axial through hole has a positioning groove for the positioning of the terminal. The outer wall of the lower part of the T-shaped tee sleeve has a grounding lead connection hole, and the lower end is connected by a screw thread. There is a hard insulating cover, and the internal conductor of the lead joint is located in the front face of the upper sleeve body with the front end, and the rear end is located in the front part of the positioning groove, and is embedded in the axial through hole of the upper sleeve body; the extension joint includes an extension joint The internal conductor and the rigid insulating sleeve of the continuous joint. The internal conductor of the continuous joint is a screw section, a boss section, a straight bar section and a coil section from the front to the back. The convex positioning ring, the hard insulating sleeve of the continuous joint is tapered conical, the middle section of the outer wall is a hexagonal wrench holding section, and the axial center of the hard insulating sleeve of the continuous joint has a shape from the straight rod section of the inner conductor to the The mounting hole corresponding to the shape of the coil section, the boss section and the screw section of the internal conductor of the continuous joint are located outside the front end of the hard insulating sleeve of the continuous joint, and the front end of the hard insulating sleeve of the continuous joint corresponds to the periphery of the outer diameter of the boss section of the internal conductor. Groove, the external thread of the screw section of the internal conductor of the continuous joint matches the internal thread of the internal conductor of the lead joint, the internal thread of the coil tube section matches the external thread of the screw section of the internal conductor of the butt joint; the sealing joint includes the internal conductor of the sealing joint and the sealing joint Hard insulating sleeve, the inner conductor of the sealing head is screw section, boss section and straight bar section from front to back, and the outer wall of the straight bar section has an outwardly protruding positioning ring; wherein the screw section is connected to the rear section of the inner conductor of the lead joint Connection; the axial center of the hard insulating sleeve of the sealing head has a blind hole from the front face to the rear, and the rear end of the outer wall is a hexagonal wrench holding section, and the front end of the hard insulating sleeve of the sealing head corresponds to its internal conductor boss section There are grooves on the periphery of the outer diameter; the inner conductor of the sealing head is embedded in the blind hole with its screw rod section and boss section located outside the front end of the hard insulating sleeve of the sealing head.

Or the structure of the butt joint, the lead joint, the extension joint and the sealing joint of the technical scheme three is as follows: the said butt joint includes the inner conductor of the butt joint and the hard insulating sleeve of the butt joint, and the inner conductor of the butt joint is a double thread with opposite helical directions at both ends. Head screw, the middle section is a cylindrical section whose outer diameter is larger than the outer diameter of the two ends of the screw, the outer wall of the cylindrical section has a convex positioning ring, the front section of the hard insulating sleeve of the butt joint is a conical arc extinguishing chamber, and the middle section is a hexagonal Body-shaped wrench clamping section, the rear section is a cylindrical arc extinguishing chamber with connecting threads on the inner wall, the length of the inner conductor of the butt joint is less than the length of the hard insulating sleeve of the butt joint, and the inner conductor of the butt joint is insulated with the cylindrical section corresponding to the hard insulation of the butt joint The middle section of the sleeve and the screw rods at both ends respectively extend into the arc extinguishing chamber at both ends of the hard insulating sleeve of the butt joint, and are embedded in the axial center of the hard insulating sleeve of the butt joint, which can move radially; the lead joint includes a lead wire The internal conductor of the joint and the hard insulating sleeve of the lead joint. The internal conductor of the lead joint is an internal thread tube with opposite screw threads at both ends matching the inner conductor of the pair of joints. The outer wall has an outwardly protruding positioning ring, and the lead joint is hard insulated. The sleeve is a T-shaped three-way sleeve, and the outer wall of the front section of the upper end sleeve body has an external thread that matches the inner wall thread of the cylindrical arc extinguishing inner wall of the rear section of the hard insulating sleeve of the butt joint, and the upper side of the axial through hole in the upper end sleeve body is useful. The positioning groove for the positioning of the terminal, the outer wall of the lower part of the T-shaped tee sleeve has a grounding lead connection hole, and the lower end is screwed to a hard insulating cover. The front end of the internal conductor of the lead connector is flush with the front end of the upper sleeve The rear end is located in front of the positioning groove and is embedded in the axial through hole of the upper casing; the extension joint includes an inner conductor of the extension joint and a hard insulating sleeve of the extension joint, and the inner conductor of the extension joint is a screw section, a convex section from front to back. The table section, the straight rod section and the spiral pipe section, the thread direction of the screw rod section and the spiral pipe section are opposite. The prism-shaped wrench holding section, the axial center of the rigid insulating sleeve of the continuous joint has a mounting hole corresponding to the shape of the inner conductor straight bar section to the spiral tube section, the boss section and the screw section of the internal conductor of the joint joint are located on the hard joint of the joint joint Outside the front end of the hard insulating sleeve, there is a groove on the front end of the hard insulating sleeve of the continuous joint corresponding to the outer diameter of the boss section of the internal conductor, and the external thread of the screw section of the internal conductor of the continuous joint matches the internal thread of the internal conductor of the lead joint , The internal thread of the coil pipe section matches the external thread of the screw section of the internal conductor of the butt joint; the sealing joint includes the internal conductor of the sealing joint and the hard insulating sleeve of the sealing joint, and the internal conductor of the sealing joint is embedded in the hard insulating sleeve of the sealing joint Axial center; the internal conductor of the sealing head includes a screw section and a straight rod section at the rear end, the outer wall of the straight rod section has an outwardly protruding positioning ring, and the front part of the screw section and the straight rod section protrudes from the front end of the hard insulating sleeve of the sealing head In addition, there is a blind hole in the axial center of the hard insulating sleeve of the sealing head from the front face to the rear for installing the inner conductor of the sealing head. The rear end of the outer wall of the hard insulating sleeve of the sealing head is a hexagonal wrench holding section. The front end of the insulating sleeve has a groove corresponding to the outer diameter of the inner conductor boss section outer diameter.

Or the structure of the butt joint, the lead joint, the extension joint and the sealing joint is as follows: the butt joint includes the inner conductor of the butt joint and the hard insulating sleeve of the butt joint. The integral part of the screw tube, the outer diameter of the screw tube section is larger than the outer diameter of the screw section, and the outer wall has a convex positioning ring; the front section of the hard insulating sleeve of the butt joint is a conical arc extinguishing chamber, the middle section is a wrench holding section, and the rear section The section is a hollow cylindrical section whose outer diameter is smaller than the outer diameter of the small diameter end of the previous section, and the outer wall has connecting threads. The length of the screw section of the inner conductor of the butt joint is less than the depth of the conical arc extinguishing chamber, and the inner conductor of the butt joint is extended into the conical arc extinguishing chamber by the screw section. In the room, the rear end of the coil section is flush with the rear end of the hard insulating sleeve of the butt joint, and can be embedded in the axial center of the hard insulating sleeve of the butt joint in the radial direction; the lead joint includes the inner conductor of the lead joint and the lead wire A hard insulating sleeve for the joint, the internal conductor of the lead joint is an integral part of the front screw and the rear coil matched with the internal conductor of the butt joint, the outer diameter of the screw tube section is larger than that of the screw section, and the outer wall has a convex positioning The hard insulating sleeve of the lead wire joint is a T-shaped three-way sleeve, and the front section of the upper end sleeve is a cylindrical arc extinguishing chamber. The internal thread matched with the thread, the upper side of the axial through hole in the upper end sleeve has a positioning groove for the positioning of the terminal; the outer wall of the lower sleeve of the T-shaped three-way sleeve has a grounding lead connection hole, and the lower end is connected with a hard insulation through a thread The cover, the internal conductor of the lead joint extends into the cylindrical arc extinguishing chamber with a screw section and is embedded in the front of the positioning groove on the upper side of the axial through hole in the upper casing; the continuous joint includes the internal conductor of the continuous joint and the hard Insulation sleeve, the internal conductor of the continuous joint is a screw section, a boss section, a straight bar section and a coil section from the front to the back. The hard insulating sleeve has a tapered conical shape, and the middle section of the outer wall is a wrench holding section. The axial center of the hard insulating sleeve of the continuous joint has a mounting hole corresponding to the shape of the inner conductor straight rod section to the spiral tube section. The boss section and the screw section of the conductor are located outside the front end of the rigid insulating sleeve of the continuous joint. The thread matches the internal thread of the internal conductor of the lead joint, and the internal thread of the coil section matches the external thread of the screw section of the internal conductor of the butt joint; the sealing joint includes the internal conductor of the sealing joint and the hard insulating sleeve of the sealing joint, and the sealing joint The inner conductor is embedded in the axial center of the hard insulating sleeve of the sealing head; the inner conductor of the sealing head includes the screw section and the straight rod section at the rear end, and the outer wall of the straight rod section has an outwardly protruding positioning ring. The front part protrudes out of the front end of the hard insulating sleeve of the sealing head, and the axial center of the hard insulating sleeve of the sealing head has a blind hole from the front face to the rear for installing the inner conductor of the sealing head, and the rear end of the outer wall of the hard insulating sleeve of the sealing head is The hexagonal wrench clamping section has grooves on the front end of the hard insulating sleeve of the sealing head corresponding to the outer diameter of the inner conductor boss section.

The live connection/lap joint member of the European-style cable branch box disclosed by the present invention creates the first batch of live connection members of the cable branch box. It realizes branch cable connection with different needs of one branch and multi-branch, and has a wide range of applications. It can realize live lapping, remove power supply, reduce the scope of power failure, and improve social and economic benefits.

Each joint is designed with the connecting conductor and the hard insulating sleeve as an integrated integral part, and each connecting conductor is embedded in the corresponding hard insulating sleeve, and the connecting ends of the inner conductors of each joint adopt a threaded connection structure, and the connecting conductors The connection points are all in the arc extinguishing chamber. When docking, the operator contacts are all hard insulating sleeves. After the joints are connected, all the connecting conductors are insulated and sealed, so the live working purpose of the present invention can be realized, and the operation is simple, reliable and safe. The design of the continuous joint can realize the continuous expansion of multiple continuous joints and lead joints, and improve the flexibility of branching.

In order to make the docking operation faster, a hexagonal clamping section is provided on the outer wall of the hard insulating sleeve of the butt joint, the extension joint and the sealing joint.

In order to ensure the waterproof and moisture-proof performance of each joint after connection and prevent the loosening of each joint, rubber pads are provided between adjacent joints and between the butt joints and the butt sleeves of the cable branch box.

Description of drawings

Fig. 1 is a schematic diagram of an explosion structure of Embodiment 1 of the present invention.

Fig. 2 is a schematic diagram of the explosion structure of Embodiment 2 of the present invention.

Fig. 3 is a schematic diagram of the explosion structure of Embodiment 3 of the present invention.

Fig. 4 is a schematic diagram of the explosion structure of Embodiment 4 of the present invention.

Fig. 5 is a schematic diagram of the explosion structure of Embodiment 5 of the present invention.

Fig. 6 is a schematic diagram of the explosion structure of Embodiment 6 of the present invention.

Fig. 7 is a schematic diagram of the explosion structure of Embodiment 7 of the present invention.

Fig. 8 is a schematic diagram of the explosion structure of Embodiment 8 of the present invention.

Detailed ways

Embodiment 1. This embodiment is applied to a European-style cable branch box live connection/lapping member that only needs to connect one branch wire. As shown in FIG. 1 , the connector includes a butt joint 1 , a lead joint 2 and a sealing joint 3 arranged in sequence, and the outer end of the butt joint 1 is screwed to a butt joint 4 . The butt joint 1 includes a butt joint connecting conductor 11 and a butt joint hard insulating sheath 12 integrated therewith. The inner conductor 11 of the butt joint is an integral part of the front section screw and the back section helical tube with opposite screw threads at both ends. The outer diameter of the screw tube section is larger than the outer diameter of the screw section, and the outer wall has an outwardly protruding positioning ring. The hard insulating sleeve 12 of the butt joint is tapered conical, the front section of which is a conical arc extinguishing chamber 13, and the rear section has an axial central hole. The middle section of the outer wall of the hard insulating sleeve 12 of the butt joint is a wrench clamping section 14 . The length of the screw section of the internal conductor 11 of the butt joint is smaller than the depth of the conical arc extinguishing chamber 13 . The inner conductor 11 of the butt joint extends into the conical interrupter 13 with a screw rod, and the rear end of the coil section is located at the rear end face of the axial center hole in the rear section of the hard insulating sleeve 12 of the butt joint, and is embedded in the hard insulating sleeve of the butt joint 12, the rear end of the butt joint forms a cylindrical arc extinguishing chamber 15. The lead joint 2 includes a lead joint connection conductor 21 and a lead joint rigid insulating sheath 22 integrated therewith. The inner conductor 21 of the lead joint is an integral part of a front screw and a rear coil with opposite helical directions at both ends. The outer diameter of the screw segment is larger than that of the screw segment, and the outer wall has an outwardly protruding positioning ring. The hard insulating sleeve 22 of the lead joint is a T-shaped three-way sleeve, and its upper end sleeve body is tapered conical with an axial center through hole inside. The arc extinguishing chamber 222 and the back section of the arc hole are circular holes, and the upper side of the circular hole has a positioning groove 221 for positioning the terminal, and the outer wall of the lower end of the T-shaped tee sleeve is threadedly connected with a hard insulating cover 23. The length of the screw section of the inner conductor 21 of the lead joint is smaller than the depth of the arc extinguishing chamber 222 . The inner conductor 21 of the lead joint extends into the conical arc extinguishing chamber with a screw section and is embedded in the front of the positioning groove 221 on the upper side of the axial through hole in the upper casing. The sealing head 3 includes a sealing head connecting conductor 31 and a sealing head hard insulating sheath 32 integrated therewith. The inner conductor 31 of the sealing head is embedded in the axial center of the hard insulating sleeve 32 of the sealing head. The internal conductor 31 of the sealing head includes a screw section and a straight rod section at the rear end thereof. The outer wall of the straight rod section has an outwardly protruding positioning ring. , the axial center of the hard insulating sleeve 32 of the sealing head has a blind hole from the front face to the rear for installing the inner conductor 31 of the sealing head, and the rear end of the outer wall of the hard insulating sleeve 32 of the sealing head is a hexagonal wrench holding section, The front end of the hard insulating sheath 32 of the sealing head has a groove corresponding to the outer diameter of the inner conductor boss section outer diameter.

When assembling the docking operation, first insert the terminal of the crimped cable into the positioning groove of the upper end sleeve of the lead joint, then put a rubber pad on the screw of the sealing joint, insert the screw of the sealing joint into the lead joint and pass the wiring The connecting hole on the terminal is connected to the screw tube of the lead joint connecting the conductor, and then an insulating wrench is used to clamp the hexagonal segment of the sealing head to rotate the sealing head, and the screw rod of the sealing head is fastened to the screw tube of the lead joint connecting conductor, so that The sealing head and the lead joint are assembled into one; then put the large diameter end of the hard insulating sleeve of the butt joint on the outside of the butt sleeve, insert the small diameter end into the large diameter end of the hard insulating sleeve of the lead joint, and clamp the butt joint with an insulating wrench The hexagonal segment on the hard insulating sleeve rotates the butt joint so that the two ends of the butt joint connecting conductor are threaded and fastened to the conductor in the butt sleeve and the lead joint connecting conductor at the same time.

Note that before butt jointing, put rubber pads on the screw heads of the connecting conductors of the butt joint and the lead joint. The rubber pad is waterproof, moisture-proof and loose-proof. After the joints are connected, the inner conductors are connected as a whole, and the outside is insulated and sealed by a hard insulating sleeve. When disassembling, only need to reversely rotate the butt joint to separate the connecting piece from the butt sleeve on the cable branch box.

Embodiment 2, this embodiment is applied to the live connection/lapping member of the European-style cable branch box that needs to connect two branch wires. As shown in FIG. 2 , this embodiment includes butt joints 1 , lead joints 2 , extension joints 6 , lead joints 2 and sealing joints 3 arranged in sequence. The outer end of the first butt joint 1 is screwed to the butt sleeve 4 .

The continuous joint 6 comprises a continuous joint connection conductor 61 and a continuous joint hard insulating sleeve 62 integrated therewith. The continuous joint hard insulating sleeve 62 is a tapered conical shape, and there is an axial center through hole in it, and its length is less than its length. The length of the inner continuous joint connection conductor 61, the screw rod and the helical tube front portion of the continuous joint connection conductor 61 stretch out outside the hard insulating sleeve 62 of the joint joint. The middle section of the outer wall of the connector rigid insulating sleeve 62 has a concave hexagonal wrench holding section 621 . The screw section of the internal conductor 61 of the continuous joint is threadedly connected to the rear section of the internal conductor 21 of the previous lead joint, and the coil section is threadedly connected to the front section of the internal conductor 21 of the subsequent joint. The structures of the butt joint 1 , the lead joint 2 and the sealing joint 3 in this embodiment are the same as those in the first embodiment.

In this embodiment, the adjacent two lead joints are connected as a whole through a continuous joint. When connecting, firstly connect the two lead joints with the branch wires, and then connect the two ends of the continuous joint with the lead joints respectively, and then use an insulating wrench to Rotate the splice to connect the two lead joints, then connect the rear end of the second lead joint to the sealing head, and finally connect the aforementioned integral part to the butt sleeve on the cable branch box through the butt joint: connect the two ends of the butt joint Butt with the butt sleeve of the cable branch box and the first lead joint respectively, and then use an insulating wrench to rotate the butt joint so that both ends are connected to the butt sleeve and the lead joint at the same time.

When connecting multiple branch wires, the two branch wires are analogized, and the last lead joint is closed with a sealing joint.

Embodiment 3, as shown in FIG. 3 , the difference between this embodiment and Embodiment 1 is that the connecting conductor 11 of the butt joint is a double-ended screw with opposite screw threads at both ends, and the middle section is a cylinder whose outer diameter is larger than the outer diameter of the screw. segment, and the outer wall of the cylindrical segment has an outwardly convex positioning ring. Both ends of the rigid insulating sleeve 12 of the butt joint are tapered arc extinguishing chambers 13 . The butt joint connection conductor 11 has a cylindrical section corresponding to the middle section of the butt joint hard insulating sleeve 12 , and the screw rods at both ends respectively extend into the corresponding conical arc extinguishing chamber 13 and are embedded in the axial center of the butt joint hard insulating sleeve 12 . The connecting conductor 21 of the lead joint is an internally threaded tube that matches the inner double-ended screw of the butt joint, and has opposite helical directions at both ends. The front section of the upper end casing body of the hard insulating sleeve 22 of the lead joint is a gradually expanding conical shape matched with the rear section of the hard insulating sleeve 12 of the butt joint. The lead joint connecting conductor 21 is embedded in the axial through hole of the upper casing with its front end located in the front surface of the upper casing and its rear end positioned in front of the positioning groove 221 .

The connecting conductor 31 of the sealing head is successively composed of a screw section, a boss section and a straight bar section from front to back, and the outer wall of the straight bar section has an outwardly protruding positioning ring, wherein the screw section is threadedly connected with the rear section of the lead joint connecting conductor 21; the sealing head The axial center of the hard insulating sleeve 32 has a blind hole from the front end to the rear, and the rear end of its outer wall is a hexagonal wrench clamping section. The front end of the hard insulating sleeve 32 of the sealing head has grooves corresponding to the periphery of the outer diameter of the boss section of the connecting conductor 31 of the sealing head. The connecting conductor 31 of the sealing head is embedded in the blind hole with its screw rod section and boss section located outside the front end of the hard insulating sleeve 32 of the sealing head. The assembly operation of each joint in this embodiment refers to the first embodiment.

Embodiment 4, as shown in Figure 4, this embodiment includes a butt joint 1, a lead joint 2, a continuous joint 6, a butt joint 1, a lead joint 2 and a sealing joint 3 connected in sequence, and the outer end of the first butt joint 1 It is threadedly connected with the docking sleeve 4. The connector 6 includes a connector connecting conductor 61 and a connector rigid insulator 62 integrated therewith. The inner conductor 61 of the continuous joint is sequentially composed of a screw section, a boss section, a straight section and a coil section from front to back. The rigid insulating sleeve 62 of the continuous joint is tapered and conical, and the middle section of the outer wall is a wrench clamping section. The axial center of the hard insulating sleeve 62 of the continuous joint has a mounting hole corresponding to the shape of the inner conductor straight rod section to the coil section. , the boss section and the screw section of the inner conductor 61 of the extension joint are located outside the front end of the hard insulating sleeve 62 of the extension joint, and the front end of the hard insulation sleeve 62 of the extension joint has grooves corresponding to the outer diameter of the outer diameter of the boss section of the inner conductor 61 of the extension joint. . The screw section of the internal conductor 61 of the extension joint is connected to the rear section of the inner threaded pipe inside the lead joint 2 , and the coil section is connected to the front section screw of the inner conductor 11 of the butt joint. The structures of the butt joint 1, the lead joint 2 and the sealing joint 3 in this embodiment are the same as those in the third embodiment, and the assembly and docking operations between the joints are referred to in the second embodiment.

Embodiment 5, as shown in FIG. 5 , this embodiment includes a butt joint 1 , a lead joint 2 and a sealing joint 3 connected in sequence, and the outer end of the butt joint 1 is threadedly connected with the butt sleeve 4 . The butt joint internal conductor 11 of the butt joint 1 is a double-ended screw with opposite screw threads at both ends, and the middle section is a cylindrical section with an outer diameter larger than that of the two ends of the screw, and the outer wall of the cylindrical section has an outwardly convex positioning ring. The front section of the hard insulating sleeve 12 of the butt joint is a conical arc extinguishing chamber 13, the middle section is a hexagonal wrench holding section 14, and the rear section is a cylindrical arc extinguishing chamber 15 whose outer diameter is larger than that of the small diameter end of the front section. The inner wall of the arc extinguishing chamber 15 has connecting threads. The connecting conductor 11 of the butt joint corresponds to the middle section of the hard insulating sleeve 12 of the butt joint, and the screw rods at both ends extend into the arc extinguishing chamber at both ends of the hard insulating sleeve 12 of the butt joint and are embedded in the hard insulating sleeve 12 of the butt joint. In the axial center, there is a radial movement space of about 1 mm between the inner conductor 11 of the butt joint and the hard insulating sleeve 12 of the butt joint. The lead joint internal conductor 21 of the lead joint 2 is an internally threaded tube with opposite screw threads at both ends matching the butt joint internal conductor 11 , and an externally protruding positioning ring is provided on its outer wall. The outer wall of the front section of the upper end sleeve of the lead joint rigid insulating sleeve 22 is threadedly connected with the rear section inner wall of the hard insulating sleeve 12 of the butt joint, and the upper side of the inner axial through hole has a positioning groove 221 for terminal positioning. The outer wall of the lower part of the T-shaped tee sleeve has a connection hole for grounding leads, and the lower end is threadedly connected with a hard insulating cover 23. The inner conductor 21 of the lead joint is embedded in the axial through hole of the upper casing with the front end flush with the front end of the upper casing and the rear end positioned in front of the positioning groove 221 . The sealing head 3 includes a sealing head connecting conductor 31 and a sealing head hard insulating sheath 32 integrated therewith. The inner conductor 31 of the sealing head is embedded in the axial center of the hard insulating sleeve 32 of the sealing head. The internal conductor 31 of the sealing head includes a screw section and a straight rod section at the rear end thereof. The outer wall of the straight rod section has an outwardly protruding positioning ring. , the axial center of the hard insulating sleeve 32 of the sealing head has a blind hole from the front face to the rear for installing the internal conductor 31 of the sealing head, and the rear end of the outer wall of the hard insulating sleeve 32 of the sealing head is a hexagonal wrench holding section, The front end of the hard insulating sheath 32 of the sealing head has a groove corresponding to the outer diameter of the inner conductor boss section outer diameter.

In order to improve the strength of this embodiment to adapt to the transfer of branch wires with higher voltage levels, threaded connections are used between the inner conductors of the butt joint and the lead joint and the hard insulating sleeve; The conductor can move within a small range along the radial direction. The assembly and docking operations of the joints in this embodiment refer to the first embodiment.

Embodiment 6, as shown in Figure 6, this embodiment includes a butt joint 1, a lead joint 2, a continuous joint 6, a butt joint 1, a lead joint 2 and a sealing joint 3 connected in sequence, and the outer end of the first butt joint 1 It is threadedly connected with the docking sleeve 4. The connector 6 includes a connector connecting conductor 61 and a connector rigid insulator 62 integrated therewith. The inner conductor 61 of the continuous joint is sequentially composed of a screw section, a boss section, a straight section and a coil section from front to back. The rigid insulating sleeve 62 of the continuous joint is tapered conical, and the middle section of the outer wall is a hexagonal wrench clamping section 621, and its axial center has a mounting hole corresponding to the shape of the inner conductor straight rod section to the spiral tube section, continued The boss section and the screw section of the inner conductor 61 of the joint are located outside the front end of the hard insulating sleeve 62 of the joint. A rubber pad 5 is embedded in the groove. The screw section of the internal conductor 61 of the extension joint is threadedly connected to the rear section of the internal conductor 21 of the lead joint, and the coil section is threadedly connected to the front section of the internal conductor 11 of the butt joint. The structures of the butt joint 1 , the lead joint 2 and the sealing joint 3 in this embodiment are the same as in the fifth embodiment, and the assembly and docking operations between the joints refer to the second embodiment.

Embodiment 7, as shown in FIG. 7 , this embodiment includes a butt joint 1 , a lead joint 2 and a sealing joint 3 connected in sequence, and the outer end of the butt joint 1 is threadedly connected with the butt sleeve 4 . The butt joint 1 includes a butt joint connecting conductor 11 and a butt joint hard insulating sheath 12 integrated therewith. The inner conductor 11 of the butt joint is an integral part of the front section screw and the back section helical tube with opposite screw threads at both ends. The outer diameter of the screw tube section is larger than that of the screw section, and its outer wall has an outwardly protruding positioning ring. The front section of the hard insulating sleeve 12 of the butt joint is a conical interrupter 13, the middle section is a hexagonal wrench holding section 14, and the rear section is a hollow cylindrical section with an outer diameter smaller than the outer diameter of the small diameter end of the front section. The outer wall of the rear section has Connection thread. The inner conductor 11 of the butt joint extends into the conical arc extinguishing chamber 13 of the hard insulating sleeve 12 of the butt joint with a screw section and is embedded in the axial center of the hard insulating sleeve 12 of the butt joint, so that the inner conductor 11 of the butt joint is in contact with the hard insulating sleeve of the butt joint. There is a radial movement space of about 1mm between the quality insulating sleeves 12. The lead joint 2 includes a lead joint connection conductor 21 and a lead joint rigid insulating sheath 22 integrated therewith. The inner conductor 21 of the lead joint is an integral part of the front screw rod and the rear coil tube matched with the butt joint inner conductor 11. The outer diameter of the screw tube segment is larger than the outer diameter of the screw rod segment, and the outer wall has an outwardly protruding positioning ring. The hard insulating sleeve 22 of the lead joint is a T-shaped three-way sleeve, and the front section of the upper end of the sleeve is a cylindrical arc extinguishing chamber 22, and the inner wall of the cylindrical arc extinguishing chamber 222 has an outer wall with the outer wall of the rear section of the hard insulating sleeve 12 of the butt joint. The thread matches the internal thread, and the upper side of the axial through hole in the upper sleeve has a positioning groove 221 for positioning the terminal. The outer wall of the lower part of the T-shaped tee sleeve has a connection hole for grounding leads, and the lower end is threadedly connected with a hard insulating cover 23. The inner conductor 21 of the lead joint extends into the cylindrical arc extinguishing chamber 221 with a screw section and is embedded in the front of the positioning groove on the upper side of the axial through hole in the upper casing body. The sealing head 3 includes a sealing head connecting conductor 31 and a sealing head hard insulating sheath 32 integrated therewith. The inner conductor 31 of the sealing head is embedded in the axial center of the hard insulating sleeve 32 of the sealing head. The internal conductor 31 of the sealing head includes a screw section and a straight rod section at the rear end thereof. The outer wall of the straight rod section has an outwardly protruding positioning ring. , the axial center of the hard insulating sleeve 32 of the sealing head has a blind hole from the front face to the rear for installing the internal conductor 31 of the sealing head, and the rear end of the outer wall of the hard insulating sleeve 32 of the sealing head is a hexagonal wrench holding section, The front end of the hard insulating sheath 32 of the sealing head has a groove corresponding to the outer diameter of the inner conductor boss section outer diameter.

In order to improve the strength of this embodiment to adapt to the transfer of branch wires with higher voltage levels, threaded connections are used between the inner conductors of the butt joint and the lead joint and the hard insulating sleeve; The conductor can move within a small range along the radial direction. The assembly and docking operations of the joints in this embodiment refer to the first embodiment.

Embodiment 8, as shown in FIG. 8 , this embodiment includes a butt joint 1, a lead joint 2, a continuous joint 6, a butt joint 1, a lead joint 2 and a sealing joint 3 connected in sequence, and the outer end of the first butt joint is connected to the Butt sleeve 4 threaded connection. The connector 6 includes a connector connecting conductor 61 and a connector rigid insulator 62 integrated therewith. The inner conductor 61 of the continuous joint is sequentially composed of a screw section, a boss section, a straight section and a coil section from front to back. The rigid insulating sleeve 62 of the connector is tapered conical, and the middle section is a hexagonal wrench holding section 621 . The axial center of the rigid insulating sleeve 62 of the continuous joint has a mounting hole whose shape corresponds to the shape of the inner conductor straight bar section to the coil section, and the boss section and the screw section of the internal conductor 61 of the joint joint are located outside the front end of the hard insulating sleeve 62 , the front end of the splice hard insulating sleeve 62 has grooves corresponding to the periphery of the outer diameter of the splice inner conductor 61 boss section. The screw section of the internal conductor 61 of the extension joint is threadedly connected to the rear section of the internal conductor 21 of the lead joint, and the coil section is threadedly connected to the front section of the internal conductor 11 of the butt joint. The structures of the butt joint 1, the lead joint 2 and the sealing joint 3 in this embodiment are the same as those in the seventh embodiment, and the assembly and docking operations between the joints are referred to in the second embodiment.

Each joint is designed with the connecting conductor and the hard insulating sleeve as an integrated integral part, and each connecting conductor is embedded in the corresponding hard insulating sleeve, and the connecting ends of the inner conductors of each joint adopt a threaded connection structure, and the connecting conductors The connection points are all in the arc extinguishing chamber. When docking, the operator contacts are all hard insulating sleeves. After the joints are connected, all the connecting conductors are insulated and sealed, so the live working purpose of the present invention can be realized, and the operation is simple, reliable and safe. The design of the continuous joint can realize the continuous expansion of multiple continuous joints and lead joints, and improve the flexibility of branching.

Claims (6)

1. A European-style cable branch box live connection/lapping member is characterized in that it includes at least one butt joint and lead joint, several continuous joints and a sealing joint, and the butt joint, lead joint and sealing joint are connected in sequence to form a branch The connection components or adjacent lead joints are connected by continuous joints and butt joints. The front end of the first lead joint is connected to the butt joint, and the rear end of the last lead joint is connected to the sealing joint to form a multi-branch connection assembly; each joint is internal The integral part of the conductor and the external hard insulating sleeve is integrated, and the connection ends of the internal conductors of each joint adopt a threaded connection structure; after each joint is connected, the internal conductor is connected as a whole, and the outside is insulated and sealed by the hard insulating sleeve; when installing and disassembling Rotary butt joint or continuous joint is enough. 2. The European-style cable branch box live connection/lapping member according to claim 1, wherein the butt joint includes an inner conductor of the butt joint and a hard insulating sleeve of the butt joint, and the inner conductor of the butt joint is a threaded screw at both ends. The integral part of the opposite front section screw and rear section coil, the outer diameter of the coil section is larger than the outer diameter of the screw section, and the outer wall has a convex positioning ring, the hard insulating sleeve of the butt joint is tapered conical, and the front section is Conical interrupter, the rear section is a cylindrical interrupter, the middle section of the outer wall of the hard insulating sleeve of the butt joint is a wrench holding section; the length of the screw section of the internal conductor of the butt joint is less than the depth of the conical interrupter, and the inner conductor of the butt joint The screw section extends into the conical arc extinguishing chamber, and the coil section is located in the cylindrical arc extinguishing chamber and is embedded in the axial center of the hard insulating sleeve of the butt joint; The lead joint includes the inner conductor of the lead joint and the hard insulating sleeve of the butt joint; the inner conductor of the lead joint is an integral part of the front screw and the rear coil with opposite screw threads at both ends, and the outer diameter of the coil section is larger than the outer diameter of the screw section The diameter and the outer wall have an outwardly protruding positioning ring. The hard insulating sleeve of the lead connector is a T-shaped three-way sleeve. The arc extinguishing chamber matched with the rear section of the hard insulating sleeve of the butt joint, the rear section is a round hole, the upper side of the hole wall of the round hole has a positioning groove for the positioning of the terminal, and the outer wall of the lower end of the T-shaped tee bushing passes through the The threaded connection has a hard insulating cover. The length of the screw of the inner conductor of the lead joint is less than the depth of the conical arc extinguishing chamber. The inner conductor of the lead joint extends into the arc extinguishing chamber with a screw section and is embedded in the upper side of the axial through hole in the upper sleeve. the front of the positioning groove; The extension joint includes the inner conductor of the extension joint and the hard insulating sleeve of the extension joint. The inner conductor of the extension joint is an integral part of the front screw and the rear coil with opposite screw threads at both ends, and the outer diameter of the coil section is larger than the outer diameter of the screw section. The diameter and the outer wall have outwardly protruding positioning rings, the hard insulating sleeve of the continuous joint is tapered conical, the middle section of the outer wall is a wrench clamping section, and the internal conductor of the continuous joint protrudes from the front part of the screw section and the coil section. The front end of the insulating sleeve, the rear end of the coil section, and the rear end of the rigid insulating sleeve of the continuous joint are flush and embedded in the axial center of the rigid insulating sleeve of the continuous joint, and the front end of the hard insulating sleeve of the continuous joint corresponds to the outside of the boss section of the internal conductor There are grooves on the periphery of the diameter; The sealing head includes an inner conductor of the sealing head and a hard insulating sleeve of the sealing head, the inner conductor of the sealing head is embedded in the axial center of the hard insulating sleeve of the sealing head; the inner conductor of the sealing head includes a screw section and a straight rod section at its rear end, The outer wall of the straight rod section has an outwardly protruding positioning ring, and the front parts of the screw rod section and the straight rod section protrude from the front end of the hard insulating sleeve of the sealing head, and the axial center of the hard insulating sleeve of the sealing head has a blind hole from the front end to the rear It is used to install the internal conductor of the sealing head. The rear end of the outer wall of the hard insulating sleeve of the sealing head is a hexagonal wrench holding section, and the front end of the hard insulating sleeve of the sealing head corresponds to the outer diameter of the boss section of the inner conductor. . 3. The European-style cable branch box live connection/lapping member according to claim 1, characterized in that: the butt joint includes an inner conductor of the butt joint and a hard insulating sleeve of the butt joint, and the inner conductor of the butt joint has two ends Double-ended screw with opposite helical direction, the middle section is a cylindrical section whose outer diameter is larger than the outer diameter of the two ends of the screw, and the outer wall of the cylindrical section has an outwardly convex positioning ring; the two ends of the double-ended screw are covered with rubber pads; Both ends of the hard insulating sleeve of the joint are conical arc extinguishing chambers, and the middle section is a concave wrench holding section; the length of the screw section of the internal conductor of the joint is less than the depth of the conical arc extinguishing chamber, and the internal conductor of the joint is cylindrical The section corresponds to the middle section of the hard insulating sleeve of the butt joint, and the screw rods at both ends extend into the corresponding conical arc extinguishing chamber and are embedded in its axial center; The lead joint includes the internal conductor of the lead joint and the hard insulating sleeve of the butt joint; the internal conductor of the lead joint is an internal threaded tube with opposite screw threads at both ends matching the inner conductor of the butt joint, and its outer wall has a protruding The positioning ring and the hard insulating sleeve of the lead joint are T-shaped three-way sleeves. The positioning groove for the positioning of the terminal, the outer wall of the lower part of the T-shaped tee sleeve has a grounding lead connection hole, and the lower end is screwed to a hard insulating cover. The rear end is located in the front of the positioning groove and is embedded in the axial through hole of the upper sleeve; The extension joint includes the inner conductor of the extension joint and the hard insulating sleeve of the extension joint. The inner conductor of the extension joint is a screw section, a boss section, a straight bar section and a coil section in sequence from front to back, and the helical directions of the screw section and the coil section are opposite. , there is a protruding positioning ring on the straight rod section, the hard insulating sleeve of the continuous joint is tapered conical, the middle section of the outer wall is a hexagonal wrench holding section, and the axial center of the hard insulating sleeve of the continuous joint has a shape The installation hole corresponds to the shape of the inner conductor straight rod section to the coil section. The boss section and the screw section of the inner conductor of the extension joint are located outside the front end of the hard insulation sleeve of the extension joint. The front end of the hard insulation sleeve of the extension joint corresponds to the protrusion of the inner conductor. There is a groove on the periphery of the outer diameter of the table section, the external thread of the screw section of the internal conductor of the continuous joint matches the internal thread of the internal conductor of the lead joint, and the internal thread of the spiral tube section matches the external thread of the screw section of the internal conductor of the butt joint; The sealing head includes an inner conductor of the sealing head and a hard insulating sleeve of the sealing head. The inner conductor of the sealing head is a screw section, a boss section and a straight bar section in sequence from front to back, and the outer wall of the straight bar section has an outwardly protruding positioning ring; wherein The screw section is connected to the back section of the inner conductor of the lead joint; the hard insulating sleeve of the sealing joint has a blind hole from the front end to the rear in the axial center, and the rear end of the outer wall is a hexagonal wrench holding section, and the sealing joint is hard. The front end of the hard insulating sleeve has a groove corresponding to the outer diameter of the boss section of the internal conductor; the inner conductor of the sealing head is embedded in the blind hole with its screw section and the boss section located outside the front end of the hard insulating sleeve of the sealing head. 4. The European-style cable branch box live connection/lapping member according to claim 1, characterized in that: the butt joint includes an inner conductor of the butt joint and a hard insulating sleeve of the butt joint, and the inner conductor of the butt joint is a threaded screw at both ends. The opposite direction of the double-ended screw, the middle section is a cylindrical section with an outer diameter larger than the outer diameter of the two ends of the screw, the outer wall of the cylindrical section has a convex positioning ring, the front section of the hard insulating sleeve of the butt joint is a conical arc extinguishing chamber, and the middle The section is a hexagonal wrench clamping section, and the rear section is a cylindrical arc extinguishing chamber with connecting threads on the inner wall. The length of the inner conductor of the butt joint is less than the length of the hard insulating sleeve of the butt joint, and the inner conductor of the butt joint is corresponding to the cylindrical section. The middle section of the rigid insulating sleeve of the joint and the screw rods at both ends respectively extend into the arc extinguishing chamber at both ends of the rigid insulating sleeve of the butt joint, and are embedded in the axial center of the hard insulating sleeve of the butt joint, which can move along the radial direction; The lead joint includes an internal conductor of the lead joint and a hard insulating sleeve of the lead joint. The internal conductor of the lead joint is an internally threaded tube with opposite screw threads at both ends matching the internal conductor of the butt joint, and an externally protruding positioning ring is provided on its outer wall. , the hard insulating sleeve of the lead joint is a T-shaped three-way sleeve, and the outer wall of the front section of the upper end sleeve body has an external thread matching the inner wall thread of the cylindrical arc extinguishing inner wall of the rear section of the hard insulating sleeve of the butt joint, and the shaft in the upper end sleeve body There is a positioning groove for the positioning of the terminal on the upper side of the through hole. The outer wall of the lower part of the T-shaped tee sleeve has a grounding lead connection hole, and the lower end is connected with a hard insulating cover through threads. The front end of the sleeve body is flush, and the rear end is located in front of the positioning groove and embedded in the axial through hole of the upper end sleeve body; The extension joint includes the inner conductor of the extension joint and the hard insulating sleeve of the extension joint. The inner conductor of the extension joint is a screw section, a boss section, a straight bar section and a coil section in sequence from front to back, and the helical directions of the screw section and the coil section are opposite. , there is a convex positioning ring on the straight rod section; the hard insulating sleeve of the continuous joint is tapered conical, the middle section of the outer wall is a hexagonal wrench holding section, and the axial center of the hard insulating sleeve of the continuous joint has a shape The installation hole corresponds to the shape of the inner conductor straight rod section to the coil section. The boss section and the screw section of the inner conductor of the extension joint are located outside the front end of the hard insulation sleeve of the extension joint. The front end of the hard insulation sleeve of the extension joint corresponds to the protrusion of the inner conductor. There is a groove on the periphery of the outer diameter of the table section, the external thread of the screw section of the internal conductor of the continuous joint matches the internal thread of the internal conductor of the lead joint, and the internal thread of the coil tube section matches the external thread of the screw section of the internal conductor of the butt joint; The sealing head includes an inner conductor of the sealing head and a hard insulating sleeve of the sealing head, the inner conductor of the sealing head is embedded in the axial center of the hard insulating sleeve of the sealing head; the inner conductor of the sealing head includes a screw section and a straight rod section at its rear end, The outer wall of the straight rod section has an outwardly protruding positioning ring, and the front parts of the screw rod section and the straight rod section protrude from the front end of the hard insulating sleeve of the sealing head, and the axial center of the hard insulating sleeve of the sealing head has a blind hole from the front end to the rear It is used to install the internal conductor of the sealing head. The rear end of the outer wall of the hard insulating sleeve of the sealing head is a hexagonal wrench holding section, and the front end of the hard insulating sleeve of the sealing head corresponds to the outer diameter of the boss section of the inner conductor. . 5. The European-style cable branch box live connection/lapping member according to claim 1, wherein the butt joint includes an inner conductor of the butt joint and a hard insulating sleeve of the butt joint, and the inner conductor of the butt joint is a threaded screw at both ends. The integral part of the opposite front screw and rear coil, the outer diameter of the screw segment is larger than the outer diameter of the screw segment, and the outer wall has a convex positioning ring; the front part of the hard insulating sleeve of the butt joint is a conical arc extinguishing chamber, The section is a wrench holding section, the rear section is a hollow cylindrical section with an outer diameter smaller than that of the small diameter end of the front section, and the outer wall has connecting threads. The length of the screw section of the internal conductor of the joint is less than the depth of the conical interrupter. The screw section extends into the conical arc extinguishing chamber, the rear end of the coil section is flush with the rear end of the hard insulating sleeve of the butt joint, and can be moved radially and embedded in the axial center of the hard insulating sleeve of the butt joint; The lead joint includes an inner conductor of the lead joint and a hard insulating sleeve of the lead joint. The inner conductor of the lead joint is an integral part of a front screw and a rear coil matched with the inner conductor of the butt joint, and the outer diameter of the coil section is larger than that of the screw. The outer diameter and outer wall of the section have an outwardly protruding positioning ring; the hard insulating sleeve of the lead wire joint is a T-shaped three-way sleeve, and the front section of the upper end sleeve is a cylindrical arc extinguishing chamber, and the inner wall of the cylindrical arc extinguishing chamber has the same The external thread of the outer wall of the rear section of the hard insulating sleeve of the butt joint matches the internal thread, and the upper side of the axial through hole in the upper end sleeve has a positioning groove for the positioning of the terminal; the outer wall of the lower sleeve of the T-shaped three-way sleeve has a grounding lead The connection hole, the lower end is connected with a hard insulating cover by thread, and the internal conductor of the lead joint extends into the cylindrical arc extinguishing chamber with a screw section and is embedded in the front of the positioning groove on the upper side of the axial through hole in the upper casing; The extension joint includes the inner conductor of the extension joint and the hard insulating sleeve of the extension joint. The inner conductor of the extension joint is a screw section, a boss section, a straight bar section and a coil section in sequence from front to back, and the helical directions of the screw section and the coil section are opposite. , there is a protruding positioning ring on the straight rod section; the hard insulating sleeve of the continuous joint is tapered conical, the middle section of the outer wall is a wrench holding section, and the axial center of the hard insulating sleeve of the continuous joint has a shape that is in direct contact with the internal conductor. The installation hole corresponding to the shape of the rod section to the coil section, the boss section and the screw section of the internal conductor of the continuous joint are located outside the front end of the hard insulating sleeve of the joint joint, and the front end of the hard insulating sleeve of the joint joint corresponds to the outer diameter of the boss section of the internal conductor There is a groove on the periphery of the connector, the external thread of the screw section of the internal conductor of the continuous joint matches the internal thread of the internal conductor of the lead joint, and the internal thread of the coil tube section matches the external thread of the screw section of the internal conductor of the butt joint; The sealing head includes an inner conductor of the sealing head and a hard insulating sleeve of the sealing head, the inner conductor of the sealing head is embedded in the axial center of the hard insulating sleeve of the sealing head; the inner conductor of the sealing head includes a screw section and a straight rod section at its rear end, The outer wall of the straight rod section has an outwardly protruding positioning ring, and the front parts of the screw rod section and the straight rod section protrude from the front end of the hard insulating sleeve of the sealing head, and the axial center of the hard insulating sleeve of the sealing head has a blind hole from the front end to the rear It is used to install the internal conductor of the sealing head. The rear end of the outer wall of the hard insulating sleeve of the sealing head is a hexagonal wrench holding section, and the front end of the hard insulating sleeve of the sealing head corresponds to the outer diameter of the boss section of the inner conductor. . 6. The live connection/overlap member of the European-style cable branch box according to claim 1, characterized in that: when the joints are connected, they are matched with corresponding rubber pads.