CN113154212A

CN113154212A - Transposition system for camera and control method thereof

Info

Publication number: CN113154212A
Application number: CN202110361854.2A
Authority: CN
Inventors: 邱东; 陆壮志
Original assignee: General Designing Institute of Hubei Space Technology Academy
Current assignee: General Designing Institute of Hubei Space Technology Academy
Priority date: 2021-04-02
Filing date: 2021-04-02
Publication date: 2021-07-23
Anticipated expiration: 2041-04-02
Also published as: CN113154212B

Abstract

The application relates to a transposition system for a camera and a control method thereof, wherein the transposition system comprises: a mounting box body, wherein a transposition space is arranged in the mounting box body; the rotor is rotationally arranged on the mounting box body, the bottom of the rotor extends into the transposition space, and the rotor is connected with a single-sided magnet; the top of the rotor is used for connecting the camera body; the first electromagnet is positioned in the transposition space and outside the motion track of the single-sided magnet, and the first electromagnet is used for electrifying and attracting the single-sided magnet and driving the rotor to drive the camera body to rotate. The rotor is rotated in place for the first time by utilizing the magnetic force between the first electromagnet and the single-sided magnet, and the rotor is pushed to finally complete transposition by matching with a pressing block of the locking assembly, so that the rotor is small in size and does not occupy space; the problems of processing difficulty and difficulty in size miniaturization caused by the use of a small motor, a fluted disc or a worm and the like are solved; in addition, the structure for completing rotation and locking is simple, so that the cost is relatively low.

Description

Transposition system for camera and control method thereof

Technical Field

The application relates to the field of aerospace observation, in particular to a transposition system for a camera and a control method thereof.

Background

With the progress of scientific technology, the aerospace technology is developed more and more, and a great deal of life is added to people regardless of the aerospace technology for mysterious exploration in the universe space and the aerospace technology for facilitating the travel of people, wherein the camera can be used for observing the operation process of a spacecraft, such as the separation of a satellite on a rocket, the separation of bullets on a shrapnel and the like.

In some related technologies, a common camera usually has a fixed focusing range, and its field of view is affected by the focusing range, and in order to expand the field of view, a manner of increasing the number of cameras or increasing an indexing structure to rotate the cameras is adopted, but the following problems exist:

(1) the existing transposition structure for the camera is usually driven by a small motor and is locked by matching with a positioning pin, a worm or a fluted disc; on one hand, the camera is generally light and small, and in order to realize rotation of light load, a small motor, a fluted disc or a worm and the like used for reducing the size need to be subjected to finish machining and modulus control, so that the difficulty is high, the size is generally difficult to machine to be smaller, and the market products of the small motor cannot meet the requirements generally; on the other hand, the transmission structure among the motor, the positioning pin, the worm or the fluted disc is complex, and the matched driving and locking structure of the motor, the positioning pin, the worm or the fluted disc requires considerable cost.

(2) The mode of adding the number of cameras not only occupies space, but also needs to be equipped with corresponding circuits, electroplates and the like, thereby increasing the cost.

In other related technologies, in a separation environment in an atmosphere, a high-temperature airflow is introduced into a cabin section in a separation process, thermal shock of a camera mounted in the cabin section is caused, and a protective cover needs to be arranged on the camera for thermal protection, but the following defects exist:

(1) the camera is influenced by the field range of the camera, and the size of the protective cover on the camera is limited, so that the field range of the camera is reduced; for example, the field angle of a general camera is ± 35 °, and the field angle is reduced to ± 30 ° by partial shielding of the heat shield.

Disclosure of Invention

The embodiment of the application provides an indexing system for a camera and a control method thereof, and aims to solve the problem that the indexing system in the related art is small and difficult to meet the rotation requirement of a light load of the camera.

In a first aspect, there is provided an indexing system for a camera head, comprising:

a mounting box body, wherein a transposition space is arranged in the mounting box body;

the rotor is rotationally arranged on the mounting box body, the bottom of the rotor extends into the transposition space, and the rotor is connected with a single-sided magnet; the top of the rotor is used for connecting the camera body;

the first electromagnet is positioned in the transposition space and positioned outside the motion trail of the single-sided magnet, and the first electromagnet is used for attracting the single-sided magnet and driving the rotor to rotate on the mounting box body around the axis of the rotor when being electrified to generate a magnetic field so as to drive the camera body to rotate.

In some embodiments, the rotor comprises:

the shaft envelope is connected to the mounting box body and is internally provided with an accommodating space;

a shaft sealing cover which is arranged at the bottom of the shaft sealing sleeve and seals the accommodating space;

the rotating shaft structure is provided with a bearing, and the bearing is fixed in the accommodating space; the rotating shaft structure is rotatably connected to the mounting box body through the bearing, and the bottom of the rotating shaft structure extends into the mounting space;

the rotating wheel is arranged at the bottom of the rotating shaft structure, and the single-face magnet is connected to the bottom of the rotating wheel.

In some embodiments, a locking assembly is further included and is mounted within the indexing space and is used to compress or release the rotor.

In some embodiments, the number of the single-sided magnets is three, and the single-sided magnets are distributed along the circumferential direction of the rotating wheel at 120 degrees;

the rotating wheel is in a Lailou triangle shape;

and with the rotating wheel as the center of a circle, the first electromagnet attracts one of the single-sided magnets to rotate, wherein the central angle of the single-sided magnet is greater than or equal to one half of the central angle between two adjacent single-sided magnets.

In some embodiments, a locking assembly is further included and is mounted within the indexing space and is configured to lock or urge the rotor.

In some embodiments, the locking assembly includes a pressing block for locking or pushing the rotor, the pressing block is an arc-shaped pressing block, and the radius of an arc surface of the pressing block contacting with the rotating wheel is equal to the radius of an arc edge of the rotating wheel.

In some embodiments, further comprising:

a heat shield, comprising:

a cylinder having a mounting space therein and a mounting groove formed at a top thereof;

-a connection base, which is hermetically connected to the bottom of the cylinder, the installation box being located in the installation space and being connected to the connection base; the rotor and the first electromagnet are both positioned in the mounting space;

the visual piece is arranged in the mounting groove and is used for being vertical to the central axis of the camera body;

and the pressing ring is ballasted on the visual sheet and is connected with the barrel.

In some embodiments, the top of the cylinder body is provided with three inclined planes which are uniformly distributed at intervals of 120 degrees along the circumferential direction of the cylinder body;

the intersection on inclined plane, and be located the central detachable connection at barrel top has the switching piece that is used for connecting the clamping ring, be equipped with on the switching piece with three the inclined plane corresponds parallelly, and is located the three connection face in the coplanar.

In a second aspect, a control method for an indexing system of a camera is provided, comprising the steps of:

electrifying the locking assembly to enable the pressing block to be far away from the rotating wheel until the pressing block is unlocked in place;

electrifying the first electromagnet to enable the rotating wheel to rotate by a first rotating angle;

powering off the locking assembly, and continuously electrifying the first electromagnet to enable the pressing block to be close to the rotating wheel until the pressing block is contacted with the rotating wheel;

continuing to cut off the power of the first electromagnet, and enabling the pressing block to push the rotating wheel to rotate by a second rotation angle until the cambered surface of the pressing block is overlapped with the cambered edge of the rotating wheel;

and completing one transposition and locking the rotating wheel.

In a third aspect, a camera is provided, which includes:

an indexing system; and the number of the first and second groups,

a camera body disposed on the indexing system;

the heat protection cover is characterized by comprising a closed heat protection cover, wherein an installation space is arranged in the heat protection cover, a visual sheet is obliquely arranged on the heat protection cover, and the transposition system and the camera body are installed in the installation space.

The beneficial effect that technical scheme that this application provided brought includes:

the embodiment of the application provides an indexing system, because the rotor is arranged on the installation box body, can rotate and is matched with the single-face magnet at the bottom of the rotor and the first electromagnet, when the first electromagnet is electrified to generate a magnetic field, the single-face magnet spaced from the first electromagnet is close to the first electromagnet under the action of the magnetic field force, so that the rotor connected with the single-face magnet also rotates along with the first electromagnet, the rotor is rotated by the structure by utilizing the magnetic force between the first electromagnet and the single-face magnet, and the indexing system is simple in structure, easy to process, small in size and free of occupying space; the problems of processing difficulty and difficulty in size miniaturization caused by the use of a small motor, a fluted disc or a worm and the like are solved; in addition, the structure for completing rotation and locking is simple, so that the cost is relatively low, and therefore, the indexing system achieves the purpose of low cost and miniaturization.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic perspective view of a camera with a heat shield according to an embodiment of the present disclosure;

fig. 2 is a schematic cross-sectional view of a camera with a heat shield according to an embodiment of the present disclosure;

FIG. 3 is an exploded view of a camera with a heat shield according to an embodiment of the present application;

fig. 4 is a schematic overall structure diagram of an indexing system equipped with a camera body according to an embodiment of the present disclosure;

fig. 5 is an exploded view of an indexing system with a camera body according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a locking assembly provided in an embodiment of the present application;

fig. 7 is a schematic view of a single-sided magnet according to an embodiment of the present application in a state of completing one complete rotation;

fig. 8 is a schematic view of a single-sided magnet according to an embodiment of the present application in a state of completing one complete rotation;

fig. 9 is a single-sided magnet of another configuration provided by an embodiment of the present application;

fig. 10 is a flowchart of a control method for an indexing system of a camera according to an embodiment of the present disclosure.

In the figure: 1. installing a box body; 2. a rotor; 20. a rotating shaft structure; 21. a rotating wheel; 22. a shaft envelope; 23. a shaft seal cover; 3. a camera body; 4. a single-sided magnet; 5. a first electromagnet; 6. a locking assembly; 60. a second electromagnet; 61. a movable rod; 62. a compression spring; 63. briquetting; 7. a thermal shield; 70. a barrel; 71. connecting a base; 72. a switching block slot; 73. a transfer block; 8. a connection base; 9. a visible sheet; 10. mounting grooves; 11. pressing a ring; 12. and a controller.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a transposition system for a camera and a control method thereof, and aims to solve the problem that the transposition system in the related art is small and difficult to meet the rotation requirement of a light load of the camera.

Referring to fig. 4-9 and fig. 2, an indexing system for a camera includes a mounting case 1, a rotor 2, a single-sided magnet 4 and a first electromagnet 5;

the mounting box body 1 is internally provided with a transposition space, the rotor 2 is rotatably arranged on the mounting box body 1, the bottom of the rotor 2 extends into the transposition space, the single-sided magnet 4 is arranged at the bottom of the rotor 2, and the top of the rotor 2 is used for being connected with the camera body 3; the first electromagnet 5 is positioned in the indexing space, and the first electromagnet 5 is positioned outside the motion track of the single-sided magnet 4 on the rotor 2, so that the first electromagnet 5 is prevented from blocking or limiting the rotation of the single-sided magnet 4; when the first electromagnet 5 is electrified to generate a magnetic field, the first electromagnet 5 attracts the single-face magnet 4, and the driving rotor 2 drives the camera body 3 to rotate.

Through the structure, the rotor 2 is driven by the magnetic force of the magnetic field generated by the first electromagnet 5, the structure is relatively simple, the processing is easy, the size can meet the miniaturization requirement of the rotation of the light load of the camera, and the problems of processing difficulty and difficulty in size miniaturization caused by the use of a small motor, a fluted disc or a worm and the like are avoided; in addition, the structure for completing rotation and locking is simple, so that the cost is relatively low.

In addition, when in use, the single-sided magnet 4 is ensured to be positioned in the magnetic field, the rotor 2 can be driven to rotate by the magnetic force, and a certain distance area is required between the single-sided magnet 4 and the first electromagnet 5, wherein the distance is the distance area through which the rotor 2 rotates; after the first electromagnet 5 attracts the single-sided magnet 4 to the right position, the distance between the first electromagnet 5 and the rotor 2 is closest, the magnetic field force is maximum, and the attraction force is strongest, so that after the single-sided magnet 4 is in the right position, the rotor 2 cannot deviate or rotate, the effect of stopping the rotor 2 is achieved, and the miniaturization design requirement of driving the rotor 2 to rotate is met by the structure;

the single-sided magnet 4 may be one or more, and is provided according to an angle at which the camera body 3 is to be indexed.

In some preferred embodiments, when the single-sided magnet 4 is used, the magnetic side is facing the first electromagnet 5, the single-sided magnet 4 is shielded, and the unshielded side is strengthened in magnetic property, that is, the magnetic property facing the first electromagnet 5 is strengthened, so as to facilitate the rotation of the rotor 2.

In some preferred embodiments, a plurality of single-sided magnets 4 are used, and multiple indexing is performed, which is specifically set forth below:

firstly, the method comprises the following steps: because of the plurality of single-sided magnets 4, the single-sided magnets 4 are sequentially acted with the first electromagnet 5 in the indexing process, and when one single-sided magnet 4 is attracted to the first electromagnet 5, the other single-sided magnets 4 cannot be attracted to the first electromagnet 5 or may be located in a magnetic field range, but due to the influence of the distance, the received magnetic field force is not enough to influence the rotation of the single-sided magnet 4, and the next indexing can be ensured to be carried out, so that the single-sided magnets 4 are the single-sided magnets 4 and are uniformly distributed in the circumferential direction by taking the rotor 2 as the center of a circle.

Secondly, the method comprises the following steps: after each indexing, the first electromagnet 5 can attract the next single-sided magnet 4, does not affect the previous attracted single-sided magnet 4, and drives the rotor 2 to rotate, and the following design is carried out:

when the rotor 2 stops rotating, one single-sided magnet 4 is positioned in the magnetic field section, and the magnetic surface of the single-sided magnet 4 faces the first electromagnet 5, so that after each rotation, the next single-sided magnet 4 can enter the magnetic field section, and the rotor 2 can rotate circularly. .

In some preferred embodiments, as shown in fig. 5, the structure of the rotor 2 is configured to include a rotating shaft structure 20 and a rotating wheel 21, two bearings are provided on the rotating shaft structure 20, a groove matched with the bearings is provided on the mounting box body 1, the rotating shaft structure 20 is rotatably connected to the mounting box body 1 through the bearings and the groove, the bottom of the rotating shaft structure extends into the indexing space, the top of the rotating shaft structure is used for being connected to the camera body 3, the bottom of the rotating shaft structure 20 is coaxially connected to the rotating wheel 21 through a screw, and the bottom of the rotating wheel 21 is connected to a plurality of single-sided magnets 4, so that the rotating wheel 21 and the rotating shaft structure 20 rotate.

Further, be convenient for installation, fixed, support pivot structure 20 to and prevent that pivot structure 20 from droing, add bearing seal cover 22 and axle closing cap 23, specifically do:

connecting a shaft sleeve 22 on the mounting box body 1, wherein an accommodating space is arranged in the shaft sleeve 22; a shaft sealing cover 23 arranged at the bottom of the shaft sealing sleeve 22 and sealing the accommodating space;

the rotating shaft structure 20 is provided with two bearings, and the bearings are fixed in the accommodating space; the rotating shaft structure 20 is rotatably connected to the mounting box body 1 through a bearing, and the bottom of the rotating shaft structure extends into the mounting space; the runner 21 is installed at the bottom of the spindle structure 20, and the single-sided magnet 4 is attached to the bottom of the runner 21.

In some preferred embodiments, the locking assembly 6 is added in the indexing space for pressing or releasing the wheel 21, and the locking assembly 6 can be an existing locking assembly 6, such as a ratchet structure, a power-off brake and the like, but considering the requirements of miniaturization and low cost, the following arrangement is made for the locking assembly 6:

the electromagnetic switch comprises a second electromagnet 60, a movable rod 61, a compression spring 62 and a pressing block 63 capable of being attracted by magnetic force, wherein the pressing block 63 can be made of aluminum alloy, the second electromagnet 60 is fixed on the inner wall of the installation box body 1, the movable rod 61 penetrates through the second electromagnet 60 and can move along the second electromagnet 60, the pressing block 63 is connected to one end, far away from the second electromagnet 60, of the movable rod 61, and the compression spring 62 is sleeved on the movable rod 61 and is positioned between the second electromagnet 60 and the pressing block 63;

in use, when the second electromagnet 60 is energized, the pressing piece 63 and the movable rod 61 are attracted to approach to each other, the compression spring 62 is compressed, and at this time, the pressing piece 63 releases the rotating wheel 21, and the rotating shaft structure 20 can rotate.

After the second electromagnet 60 is powered off, the magnetic force disappears, and the elastic potential energy of the compression spring 62 is released, so that the movable rod 61 and the pressing block 63 approach the rotating wheel 21 and press the rotating wheel 21, and the rotating shaft structure 20 is locked.

In some preferred embodiments, as shown in fig. 7 and 8, the rotating wheel 21 is a reuleaux triangle, that is, the corresponding central angle of each arc edge is 120 °, and the center of each arc edge is at the triangular end point opposite to the arc edge, the single-sided magnets 4 are three, and are uniformly distributed at 120 ° around the rotating wheel 21, and in the initial position, only one single-sided magnet 4 faces the first electromagnet 5; and the pressing piece 63 is designed as an arc-shaped pressing piece and has an arc radius in contact with the runner 21 equal to the arc radius of the runner 21, shown as Ra in the drawing.

In addition, the distance from the pressing block 63 to the center of the rotor 21 in the form of the Lelo triangle is c, c is greater than the radius Rb of the circular track of the rotor 21 in the form of the Lelo triangle, and c is greater than Rb3 mm-5 mm, so that the normal rotation of the rotor 21 can be ensured, and the safe distance and the tolerance redundancy can be ensured.

The above design is to consider that when the indexing angle of the rotor 2 is too large, the magnetic force generated by the first electromagnet 5 is difficult to rotate the rotor 2 in place; and the rotor 2 is guaranteed to rotate each time and the setting is accurate in place, and when the rotor rotates, the matching motion of each structure is as follows:

in the first step, the second electromagnet 60 is energized, the pressing block 63 is in a released state, the center of the rotating wheel 21 is used as a center of a circle, the center angle corresponding to the track where the first electromagnet 5 attracts one of the single-sided magnets 4 to rotate is θ e, the center angle between two adjacent single-sided magnets 4 is θ d, and θ d is 120 °, where θ e is greater than 0.5 θ d, and θ e is 75 °.

And secondly, moving the pressing block 63 to the rotating wheel 21, powering off the first electromagnet 5 after the pressing block 63 is in place, pushing the rotating wheel 21 to rotate until the arc surface of the pressing block 63 is opposite to the arc edge of the Lelo triangle and completely attached, and finally completing one-time transposition and locking the rotating wheel 21.

In the above cooperation motion, the locking assembly 6 not only has the function of pressing or releasing the rotating wheel 21, but also has the function of pushing the rotating wheel 21 to assist the rotating wheel 21 to rotate in place.

In the above steps, θ e > 0.5 θ d is to ensure that the end angle of the wheel 21 in the form of a lyocell triangle rotates through the symmetry axis of the pressing block 63, and can push the wheel 21 to rotate, such as counterclockwise rotation in fig. 7 and 8, or clockwise rotation; through twice rotation, complete transposition is finally completed, and in this way, when the big angle of transposition is avoided, the magnetic force of the first electromagnet 5 can not enable the first electromagnet to rotate in place, and the rotation and the locking are more convenient to control, and the utilized structure is simpler, and the requirements of miniaturization and low cost are met.

The symmetry axis may divide the pressing block 63 into two halves, for example, an included angle θ f is formed between an end angle and the symmetry axis, θ f is 15 °, and an angle of the pressing block 63 pushing the rotating wheel 21 to rotate is 0.5 θ d- θ f is 45 °.

The power on and off of the first electromagnet 5 and the second electromagnet 60 are provided and controlled through a controller 12, and the controller 12 is arranged in the transposition space and is electrically connected with the first electromagnet 6 and the second electromagnet 60; the controller 12 energizes the first electromagnet 5 to control the current, and the current is controlled in a small-large-small sequence to realize the stability of in-place and adjust the length of indexing time.

The arrangement of the above structure enables the indexing system to control rotation and locking by utilizing the generated magnetic field force, wherein the indexing can be carried out without detecting a magnetic sensitive element, and the cost is low; and the generated magnetic field force is utilized to rotate, and in the process of pushing and rotating the position by the locking mechanism, the operation and design requirements on the rotating speed and the rotating in-place precision are strict.

In some preferred embodiments, the indexing system further comprises a heat shield 7, and the specific structure of the heat shield 7 is as follows as designed in a camera head using the indexing system.

As shown in fig. 1-3, the present application also provides a camera head using an indexing system, which includes a camera head body 3, a heat shield 7, an indexing system, and a vision sheet 9; be equipped with installation space in the inclosed heat protection casing 7 to the visual piece 9 of slope installation on the heat protection casing 7, transposition system and camera body 3 are installed in installation space.

Wherein camera body 3 passes through linking base 8 and transposition systematic connection, and 8 slopes of linking base set up, make the surface of the visual piece 9 of center pin perpendicular to of camera body 3, can look the slope installation angle of piece 9 and the inclination of camera body 3 equal, and the camera body 3 of being convenient for is aimed at visual piece 9 and is observed, avoids being sheltered from. The heat protection cover 7 is made of glass steel, the visual sheet 9 is made of high-temperature-resistant quartz glass, a hydrophobic film is plated on one surface facing the outer side of the whole machine, or double-layer glass is arranged on one surface facing the outer side of the whole machine for preventing fog, and the whole machine provides an installation position and a space for the camera.

Wherein the connection base 8 can be connected with the top of the shaft structure 20 of the indexing system through screws or threads; the vertical plane of the central axis of the rotating shaft structure 20 is parallel to the installation plane of the whole machine.

Through above structure, make camera body 3 carry out the transposition of a plurality of angles when can be heat-resisting, enlarge the field of view scope to heat protection casing 7 can not shelter from camera body 3, influences the field of view scope.

In some preferred embodiments, the vision sheet 9 can be provided as an integral lens made of a high temperature resistant quartz glass material having an area equal to the top of the heat shield 7, but the vision sheet 9 is divided into a plurality of parts and uniformly provided on the top of the heat shield 7 in consideration of heat insulation and cost; the number of the visual sheets can be set according to the indexing angles of the indexing system, for example, three visual sheets 9 in fig. 1 and 2 can be provided, the indexing system can perform 120-degree indexing once, and the visual field observation at three positions can be realized.

In some preferred embodiments, to facilitate the installation of the visual sheets 9, taking three visual sheets 9 as an example, the following settings are made:

the heat shield 7 comprises a cylinder 70 and a connecting base 71 which is hermetically installed at the bottom of the cylinder, the heat shield is made of glass fiber reinforced plastic, the top of the cylinder 70 is an inclined plane with three axisymmetrics, the top of the cylinder is distributed along the circumferential direction of the top of the cylinder at 120 degrees evenly, the angle of the inclined plane is equal to the inclined angle of the connecting base 8, even if the central axis of the camera body 3 is perpendicular to the visual piece 9, the visual piece 9 can be parallel to the camera body 3, no matter how the size of the visual piece 9 changes, and the camera body 3 can be observed through the visual piece 9.

The three-bevel face is integrally milled, before the three-bevel face is machined, a switching block groove 72 is arranged at the center of the top of the cylinder 70, a switching block 73 is installed in the switching block groove 72 through internal threads, and the threads are installed at the center of the top of the heat shield 7; then, the whole milling process is carried out to form the inclined planes, so that the transfer block 73 is positioned at the intersection of the three inclined planes, and the connection surfaces parallel to the three inclined planes are also formed on the transfer block 73, thereby facilitating the respective installation and disassembly.

Meanwhile, considering that a camera with a large angle of view may have a partial shielding factor due to the existence of the adapter block 73 near the central axis of the whole camera, in order to increase the visible range, the area of the visible sheet 9 near the top peripheral side of the cylinder 70 is larger.

The cylinder 70 and the connecting base 71 are installed through screws/nuts, and the installation points are located on the periphery of the flange faces of the cylinder 70 and the connecting base 71, so that the cylinder 70 and the connecting base 71 need to be installed outwards through holes which are opposite to each other in order to ensure the outward installation of the whole machine.

The outline of the visual sheet 9 is parallelogram, four corners are rounded off, the three slopes provide mounting grooves 10 of the visual sheet 9, the size of the mounting grooves 10 is slightly larger than the mounting cross section of the visual sheet 9, support steps are provided, then the visual sheet 9 is pressed tightly by the pressing ring 11 and is connected with the cylinder 70 through screws or bolts, so that the visual sheet 9 is fixed.

The size of the middle cavity of the pressing ring 11 is the same as the inner size of the step, the size of the pressing ring 11 is the same as that of the inclined plane, the pressing ring 11 is provided with 4 installation through holes, three installation through holes on the arc edge of the pressing ring 11 are installed on the inclined plane through screws/nuts, and the other installation through holes are installed on the transfer block 73 through screws/nuts, so that the visual piece 9 is ballasted in the installation groove 10 and is fixed.

Furthermore, in consideration of the sealing performance of the quartz glass and the glass fiber reinforced plastic during connection and the prevention of high-temperature burning loss of the visual piece 9, a high-temperature-resistant sealant or a high-temperature-resistant sealing piece is coated at the gap between the visual piece 9 and the installation groove 10, and the size of the sealing piece is the same as the installation section of the visual piece 9.

Use last adapter block 73 and clamping ring 11 to set up for the aluminum alloy, the form of adopting the aluminum alloy is installed, adapter block 73 is the aluminum alloy, can set up the screw hole in adapter block 73, strengthen being connected with clamping ring 11, the hole that adapter block 73 will be connected with three clamping ring 11 in addition, concentrate on together, avoid directly offering the through-hole that three are close mutually in the central part of barrel 70, reduce the degree of difficulty of trompil, and the through-hole that three are close mutually probably causes the barrel 70 top central part of glass steel, structural force can not reach the installation requirement and the risk of rupture.

The clamping ring 11 is made of aluminum alloy, and the visual piece 9 is conveniently and firmly installed by utilizing the heat dissipation and the strength of the clamping ring under the condition of ensuring the thermal protection.

As shown in fig. 10, a control method for an indexing system of a camera, which is described with reference to an embodiment in which a runner 21 is a reuleaux triangle, three times of indexing are performed, three observation positions are converted into an example, an angle of each rotation is 120 °, a central angle between two adjacent single-sided magnets 4 is θ d, and θ d is 120 °, and the method includes the following steps:

in the initial state, the pressing block 63 presses the rotating wheel 21, and the arc surface of the pressing block 63 is superposed with the arc edge of the rotating wheel 21;

electrifying the second electromagnet 60 by using the controller 12, so that the pressing block 63 is attracted by the second electromagnet 60, and the pressing block 63 moves in the direction away from the rotating wheel 21 until the pressing block 63 is unlocked in place;

the controller 12 is used for electrifying the first electromagnet 5, the second electromagnet 60 is continuously electrified, and the electromagnetic force generated by the first electromagnet 5 drives the single-sided magnet 4 facing the first electromagnet 5 in the magnetic field range to approach the first electromagnet 5 until the single-sided magnet 4 reaches the maximum position of the electromagnetic force, wherein the position of the single-sided magnet 4 is closest to the position of the first electromagnet 5; the rotating wheel 21 rotates for the first time in the process of rotating the single-sided magnet 4, and the rotating angle is a first rotating angle; the first rotation angle is the central angle θ e corresponding to the track of the first electromagnet 5 attracting one of the single-sided magnets 4 to rotate; θ e > 0.5 θ d, θ e is 75 °.

The controller 12 is used for powering off the second electromagnet 60, the first electromagnet 5 is continuously powered on, and the compression spring 62 pushes the pressing block 63 to be close to the rotating wheel 21 until the pressing block contacts the rotating wheel 21; the first electromagnet 5 is continuously energized to ensure that the runner 21 remains stable after the first rotation angle is rotated and does not deviate from its position due to inertia. At this time, the end angle of the trochoid-shaped rotor 21 rotates through the symmetry axis of the pressure piece 63, and the end angle and the symmetry axis form an included angle θ f, and θ f is 15 °.

The controller 12 is used for continuously powering off the first electromagnet 5, the pressing block 63 pushes the rotating wheel 21 to rotate for the second time, and the rotating angle is the second rotating angle until the arc surface of the pressing block 63 is overlapped with the arc edge of the rotating wheel 21; the second rotation angle is 0.5 θ d- θ f equal to 45 °.

Finally, 120-degree transposition is completed, the position II is observed from the observation position I, and the rotating wheel 21 is locked.

According to the control method of one transposition, the transposition of the remaining two observation positions is performed, and after the three transposition operations are completed, the camera body 3 completes one circulation and returns to the initial position.

In conclusion, the camera with the transposition system has the following advantages:

(1) the thermal protection cover 7 is utilized to meet the thermal protection requirement of aerospace observation.

(2) The transposition system is utilized to observe a plurality of positions while performing thermal protection, so that the field range is enlarged, and the purpose of observing a plurality of key points is realized.

(3) The transposition system drives the camera body 3 on the rotor 2 to rotate by utilizing magnetic force, so that the requirements of low cost and miniaturization of a rotating structure are met; the pressing block 63 is pushed by magnetic force to be locked and unlocked, and the requirements of low cost and miniaturization of the locking structure are met.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An indexing system for a camera head, comprising:

a mounting box body (1) provided with a transposition space therein;

the rotor (2) is rotatably arranged on the mounting box body (1), the bottom of the rotor extends into the transposition space, and a single-sided magnet (4) is connected to the rotor; the top of the rotor (2) is used for connecting the camera body (3);

the first electromagnet (5) is located in the transposition space, the first electromagnet (5) is located outside the motion track of the single-face magnet (4), and the first electromagnet (5) is used for attracting the single-face magnet (4) when being electrified to generate a magnetic field, so that the rotor (2) is driven to rotate on the installation box body (1) around the axis of the rotor so as to drive the camera body (3) to rotate.

2. An indexing system for a camera head according to claim 1, wherein the rotor (2) comprises:

a shaft sleeve (22) which is connected to the mounting box body (1) and is internally provided with an accommodating space;

a shaft sealing cover (23) which is arranged at the bottom of the shaft sealing cover (22) and seals the accommodating space;

the rotating shaft structure (20) is provided with a bearing, and the bearing is fixed in the accommodating space; the rotating shaft structure (20) is rotatably connected to the mounting box body (1) through the bearing, and the bottom of the rotating shaft structure extends into the mounting space;

a rotating wheel (21) which is arranged at the bottom of the rotating shaft structure (20), and the single-sided magnet (4) is connected to the bottom of the rotating wheel (21).

3. An indexing system for a camera head as claimed in claim 1, wherein:

and the locking assembly (6) is installed in the indexing space and used for pressing or loosening the rotor (2).

4. An indexing system for a camera head as claimed in claim 2, wherein:

the number of the single-sided magnets (4) is three, and the single-sided magnets are distributed along the circumferential direction of the rotating wheel (21) at an angle of 120 degrees;

the rotating wheel (21) is of a Lelo triangle shape;

and with the rotating wheel (21) as the center of a circle, the first electromagnet (5) attracts one of the single-sided magnets (4) to rotate, wherein the central angle of the rotation of one of the single-sided magnets (4) is greater than or equal to one half of the central angle between two adjacent single-sided magnets (4).

5. An indexing system for a camera according to claim 4, wherein:

and the locking assembly (6) is arranged in the indexing space and used for locking or pushing the rotor (2).

6. An indexing system for a camera according to claim 5, wherein:

the locking assembly (6) comprises a pressing block (63) used for locking or pushing the rotor (2), the pressing block (63) is an arc-shaped pressing block, and the radius of an arc surface of the pressing block (63) contacted with the rotating wheel (21) is equal to the radius of an arc edge of the rotating wheel (21).

7. An indexing system for a camera head as claimed in claim 1, further comprising:

a heat shield (7) comprising:

-a cylinder (70) having an installation space therein and a mounting groove (10) at the top thereof;

-a connection base (71) sealingly connected to the bottom of the cartridge (70), the mounting cartridge (1) being located in the mounting space and being connected to the connection base (71); the rotor (2) and the first electromagnet (5) are both positioned in the mounting space;

the visual piece (9) is arranged in the mounting groove (10) and is used for being vertical to the central axis of the camera body (3);

a clamping ring (11) which is pressed on the visual sheet (9) and is connected with the cylinder (70).

8. An indexing system for a camera according to claim 7, wherein:

the top of the cylinder (70) is provided with three inclined planes which are uniformly distributed at intervals of 120 degrees along the circumferential direction;

the intersection on inclined plane, and be located the central authorities releasable connection at barrel (70) top has switching piece (73) that are used for connecting clamping ring (11), be equipped with on switching piece (73) with three the inclined plane corresponds parallelly, and is located the three connection face in the coplanar.

9. A control method for an indexing system for a camera head according to claim 6, comprising the steps of:

electrifying the locking assembly (6) to enable the pressing block (63) to be far away from the rotating wheel (21) until the pressing block (63) is unlocked in place;

electrifying the first electromagnet (5) to enable the rotating wheel (21) to rotate by a first rotating angle;

powering off the locking assembly (6), continuously energizing the first electromagnet (5), and enabling the pressing block (63) to be close to the rotating wheel (21) until the pressing block contacts the rotating wheel (21);

continuing to cut off the power of the first electromagnet (5), and enabling the pressing block (63) to push the rotating wheel (21) to rotate by a second rotation angle until the cambered surface of the pressing block (63) is overlapped with the cambered edge of the rotating wheel (21);

completing one indexing and locking the rotating wheel (21).

10. A camera, characterized in that it comprises:

the indexing system of claim 1; and the number of the first and second groups,

a camera body (3) disposed on the indexing system;

the heat protection device comprises a closed heat protection cover (7), wherein an installation space is arranged in the heat protection cover (7), a visual sheet (9) is obliquely arranged on the heat protection cover (7), and the transposition system and the camera body (3) are installed in the installation space.