KR200467011Y1 - Up/down micro limiter mechanism in the hoist - Google Patents

Abstract

The present invention relates to a hoist over-wound device with a compact structure, which is easy to manufacture and can be applied to a narrow space, and provides more stable operability by reducing operation error.
The load chain 40 is hoisted / retracted under the guidance of the load sheave 50 connected to the drive motor 60 in the main body 10 to move the work suspended on the bottom hook 30 of the load chain 40 up and down. In the hoist configured to make, the holder (5, 5 ') which is operated by the over-wound of the load chain 40 while installing the lifting guide of the load chain 40 in the lower portion of the load sheave 50 of the main body 10 The holders 5 and 5 'are connected to the holders 5 and 5' and connected to the cam levers 4 which are lifted up together with the holders 5 and 5 'to over-wound the rod chain 40. Due to the upward movement of the holders 5 and 5 ', the cam lever 4 connected to the holders 5 and 5' contacts the limit switches 7 and 7 'to detect the over-wound signal A There is a point in constructing).

Description

Hoist over-wound prevention device {UP / DOWN MICRO LIMITER MECHANISM IN THE HOIST}

The present invention relates to a hoist over-wound device, more specifically, the compact structure is easy to manufacture and can be applied to a narrow space, and can provide more stable operation by reducing operation error It is related with the hoisting prevention device of hoist equipped with.

Hoists that are used for various purposes and purposes in various industries are used to lift heavy materials and move them vertically and horizontally. These hoists are equipped with an over-wound device to prevent over-wound by misoperation.

Looking at the over-wound prevention apparatus of the existing hoist as follows.

Installed in the interior of the Republic of Korea Utility Model Publication No. 20-2010-0009677 and prevents the hoist over-wound by shutting off the power by detecting when the hoisting position of the hook rises above the highest point and the highest point by the rotation of the lever. A limit switch is provided to make this possible.

In Korea Utility Model Publication No. 20-0335390, a crane is installed in the lifting control central limit of the crane lifting section to prevent over-wounding, so that the impact can be reduced when contacting the central limit, and the damage and wear can be minimized. The lifting control center limit of the lifting part is disclosed.

The Republic of Korea Utility Model Publication No. 20-0186835 is configured to display the height of the hoist by section through the display means according to the position of the wire rope wound on the rope drum, so that the driver easily detects the height of the hoist through the display means There is a ceiling crane that prevents lifting or over-lifting.

In Korea Registered Utility Model Publication No. 20-0120792, the displacement detection rod is installed in the torsion of the jib, and the overwinding of the tower crane that can prevent the overloading of the hoisting motor by interacting with a plurality of proximity switches installed in the jib. Preventive devices are listed.

In the Republic of Korea Utility Model Publication No. 20-1997-0038928, the operation wire rope is connected to the body through which the main wire rope is passed, and the upper end is connected to the scroll limit switch, and the lower end is connected to the body, and the upper end is connected to the power limit switch. The crane and hoist over-wound prevention device, which is composed of connected power wires and makes an emergency stop when over-wound occurs, is listed.

Korean Patent Registration No. 10-0953796 discloses an over-wound prevention device for a crane that can prevent over-wound while performing both a transmitter, a limit switch, and a weight with a simple structure.

According to Korean Patent Laid-Open Publication No. 10-2006-0024750, the load value generated simultaneously on a single or two drums by one load detecting means by setting the total load value generated in a plurality of drums in the hoisting operation to the rated load value The overload protection device of double lifter is provided to stop the operation of lifter when the lifting load exceeds the proper load value.

Overload cut-off, which blocks the transmission of driving force from the drive motor when the load sheave side is overloaded with a load sheave between the rod sheave and the rotary drive motor for hoisting and lowering the chain in Korean Utility Model Publication No. 20-1998-014754. An over-wound prevention chain hoist is disclosed, which is configured to include a clutch device for enabling over-prevention.

On the other hand, the chain hoist is a load chain connecting the top hook, the bottom hook, and the bottom hook, a load sheave for hoisting and lowering the load chain, a drive motor for rotating the load sheave, a reducer installed between the drive motor and the load sheave. The load chain is hoisted and lowered by the load sheave, which is composed of fishermen, and is driven by the driving motor to lift and lower the workpiece hooked on the bottom hook of the load chain.

However, the over-wound prevention device applied to the existing chain hoist also has a complicated structure such as a limit switch and its subsidiary circuits, which requires a high manufacturing cost, and the rod chain or the bottom hook is directly in contact with the limit switch. Direct damage could not be prevented, and there was a problem such as the occurrence of malfunction and shortening of the life of the hoist, and there was a problem such that it was difficult to install in a narrow space due to the excessive volume caused by the complicated components.

In order to solve this problem, the reducer of the driving motor detects and overloads the overload of the load sheave, which the lifting chain is hoisted and recommended in the Korean Utility Model Publication No. 20-1998-014754 already mentioned above. The over-wounding prevention device configured by the fisherman is shown.

However, the over-wound prevention device detects an overload from the drive motor of the rod sheave and operates through the overload clutch of the reduction gear which is controlled therefrom, thereby preventing the over-wound bottom hook from hitting the main body. Sex cannot be guaranteed. In addition, since the reduction gear part and the overload clutch are composed of a plurality of reduction gears, the complexity of the structure cannot be distinguished from the existing, and the volume of the reduction gear must be large, thereby increasing the total volume of the hoist.

Therefore, in the present invention, it is possible to configure the over-wound prevention device with a simple structure and to reduce the volume to increase the assemblability as well as to install in a narrow space.

More specifically, the simple and compact structure makes it possible to apply in a narrow space, and by applying a limit switch, it is possible to control at an exact point, thereby reducing the electric operation error, and the limit switch is contacted by a cam lever. It is intended to prevent the direct damage of the limit switch by making it sensed.

In addition, by simply adjusting and selecting the distance between the cam lever and the limit switch, the control (detection) range can be adjusted and applied according to the purpose and use.

The present invention for solving the above problems;

According to the invention described in [claim 1]; The lifting chain is guided to the lower part of the load sheave connected to the driving motor of the main body, and the holder is configured to be lifted up by over-winding of the load chain. In the hoist over-wound prevention device configured to detect the over-wound signal by the cam lever is in contact with the limit switch, the holder is coupled to the lifting operation to the operating hole on both sides of the plate central shaft assembled to the lower part of the body and the lever is formed on the shaft The coupling protrusion of the holder is coupled to the long hole of the lever, and the holder is connected to both sides of the lever, and the cam lever is coupled to the shaft of the lever by interlocking with the rotating shaft by the left and right lifting operation of the lever, and the limit switch is disposed on both sides of the cam lever. The cam lever is formed by protruding sensing projections on both sides of the cam lever, It is characterized in that the sensing protrusion is configured to contact the limit switch.

According to the invention as set forth in claim 2, the sensing projection of the cam lever is characterized in that it is possible to adjust the over-wound detection range according to the lifting width of the holder by varying the protruding length.

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The present invention provides a compact over-wound prevention device with a simple structure, which can be applied to a narrow space, as well as assembly, and can reduce the total volume of the hoist, thereby eliminating the concern of direct damage of the limit switch. Electrical operation errors can be reduced to ensure stable operation.

In addition, the present invention has the advantage that can be applied to a variety of hoists with a compatibility that is not limited to the structure of the hoist, and can be expected a lot of benefits and advantages such as economic benefits that can reduce the manufacturing cost in a compact structure.

1 is an overall sectional view of a hoist to which an embodiment of the present invention is applied.
Figure 2 is a cross-sectional view of the main portion to which an embodiment of the present invention is applied.
Figure 3 is a perspective view of the subject innovation over-wound device.
Figure 4 is a plan view of the subject innovation over-wound device.
Figure 5 is a perspective view of the operating state of the present invention over-wound device.
Figure 6 is an operation state diagram of the present invention over-wound prevention device.

The present invention is characterized in that the over-wound prevention unit is mounted on the lower portion of the hoist of the hoist to operate the limit switch with the cam lever to detect and control the over-wound / lower.

The hoist is formed with a top hook for installing on the ceiling at the top of the main body, and a bottom hook for hanging up and down the work is connected to the load chain at the bottom of the main body. The load sheave is installed inside the main body to raise and lower the load chain. The load sheave is connected to the drive motor and the reduction gear, and the load chain is hoisted and lowered under the guidance of the load sheave rotated by the drive motor. It is configured to move up and down the work suspended from the bottom hook.

The hoist is one of the chain hoists, and the configuration of the hoist is general, and the present invention has a compact structure of an over-wound preventing device such as a cam lever and a limit switch under the load sheave of the hoist.

Form a plate coupled to the lower body of the load sheave, such as an assembly piece, and constitutes an over-wound prevention device on the plate. The plate is provided with a working hole on both sides, and the holder to which the load chain is guided is rocked and operated by a lever. As the holder to which the load chain is guided is raised, the cam lever interlocked with the holder contacts the limit switch so that an over-wound It is configured to be detectable.

Looking at the embodiment of the present invention in detail as follows.

1 is an overall cross-sectional view of the hoist to which one embodiment of the present invention is applied, FIG. 2 is an excerpted cross-sectional view of an essential part to which an embodiment of the present invention is applied, FIG. 3 is a perspective view of an over-wound prevention device of the present invention, and FIG. Top view of the device, Figure 5 is a perspective view of the operating state of the present invention over-wound prevention apparatus, Figure 6 is an operating state diagram of the present invention over-wound prevention apparatus.

The hoist is formed with a top hook 20 for installing the ceiling on the upper portion of the main body 10, and the bottom hook 30 for lifting and lowering the work is connected to the load chain 40 at the lower portion of the main body 10. do. In the main body 10, a load sheave 50 for lifting and lowering the load chain 40 is installed, and the load sheave 50 is connected to the drive motor 60 and the reduction gear unit 70 to drive the motor 60. The load chain 40 is moved up and down by being guided by the rotating rod sheave 50, and is configured to move the work suspended from the bottom hook 30 of the load chain 40 up and down.

Hoists of this configuration are common.

The present invention is to configure the over-wound prevention device (A) with a cam lever (6) and limit switches (7, 7 ') and the like under the load sheave (50) of the hoist.

The operation holes 3 and 3 'are formed at both sides of the central shaft 2 in the plate 10 assembled under the load sheave 50 of the main body 10.

The shaft (2) is integrally formed with a lever (4) and the operating holes (3, 3 ') holder (5, 5') for guiding the rod chain 40 to be wound up / down on the load sheave 50 Are coupled to the left and right to the lever (4) formed integrally with the shaft (2). The center shaft 2 of the lever 4 is idlely coupled to the plate 1 such that the rotation of the shaft 2 causes the lever 4 left and right to move up and down (SEESAW movement up and down) about the shaft 2. .

Long holes 41 and 41 'are formed on the left and right sides of the lever 4 of the shaft 2 and coupled to the assembling protrusions 51 of the holders 5 and 5'. , 5 ') can be lifted in conjunction with the lifting operation of the lever (4). Therefore, when the holders 5 and 5 'are lifted and operated, the lever 4 is raised and lowered.

The cam lever 6 is coupled to the shaft 2 having the lever 4 integrally coupled to the cam lever 6 so that the cam lever 6 is rotated together by the rotation of the shaft 2.

The cam lever 6 protrudes to both sides the sensing protrusions 61 and 61 'contacting the limit switches 7 and 7', and both sides of the cam lever 6 on which the sensing protrusions 61 and 61 'are formed. Limit switches (7, 7 ') are installed in the cam lever (6) by the lifting operation of the holder (5, 5'), and the detection projection (61, 61 ') of the cam lever (6) is the limit switch (7). , 7 ') causes the over-wound signal to be detected and detected.

To this end, the lower ends of the holders 5 and 5 'are configured to protrude below the operating holes 3 and 3' of the plate 1 so that the actuator 80 of the load chain 40 contacts the lower part of the plate 1. In the sensing projections 61 and 61 'of the cam lever 6, the cam lever 6 rotates in the ascending direction of the holders 5 and 5' and the lever 4 as shown in the example. 7,7 ') protrudes from the lower part of the shaft 4 with respect to the center line of the shaft 4 so as to contact the limit switches 7,7' while rotating in the upward direction.

On the other hand, the holder (5, 5 ') is formed as a complete tube or as shown in the example shown in the load chain 40 to form a + -shaped guide hole 52 to guide the load chain 40 by aligning It will be described later, which will be described in detail later. In addition, between the holders 5 and 5 'and the rod sheave 50, a buffer member 8 and 8' made of spring or the like is provided to protect the load sheave 50 from excessive rise of the holder 5 and 5 '. do.

The over-wound prevention device (A) of the above-described configuration is the actuator 80 of the bottom hook 30 is connected to the load chain 40 when the over-wound occurs in the process of the load chain 40 is hoisted on the load sheave 50 ) Raises holders 5 and 5 'and cam lever 6 contacts limit switches 7 and 7' to detect signals and detect over-wound by stopping the drive motor 60 to prevent over-wound. It is.

The actuator 80 of the bottom hook 30 is implemented with a cushion rubber (Cushion Rubber) or a spring (Spring). Below is a look at the operation of the over-wound prevention device (A) according to the present invention.

In a normal work situation (a general situation in which no over-wound occurs), the load chain 40 moves up and down along the guide hole 52 of the hold 5, 5 ′, and at this time, the holder in which the load chain 40 moves up and down is guided. 5, 5 ′ does not carry any physical load from the rod chain 40, so the holders 5, 5 ′ on the left and right sides of the lever 4 remain horizontal with the lever 4.

In the above normal situation, when the load chain 40 is over-wound and the bottom hook 30 comes into contact with the hoist main body 10, the actuator 80 of the raised load chain 40 becomes a holder on either side. (5,5 ') pushes the lower end and thus one side of the lever (4) connected with the holder (5,5') is raised.

As a result, one side of the cam lever 6 coupled to the lever 4 and the shaft 2 coaxially moves up and down in the same direction as the upward direction of the holders 5 and 5 'while the raised side of the cam lever 6 is raised. The sensing protrusions 61 and 61 'contact one side limit switches 7 and 7' to detect over-wound and stop the driving motor 60 with the detected signal to prevent over-wound.

As described above, the present invention detects the over-wound through the limit switch (7,7 ') by the holder (5, 5') of the symmetrical structure of the left and right ascending by the over-wound generated in the rod chain 40 Its compact structure makes it possible to apply to a narrow space. From this, it can be expected to reduce the production cost along with the volume reduction of the hoist.

In addition, the present invention in the above process is because the over-wound is detected by the rise of the holder (5, 5 '), the load chain 40 is excessively raised so that the bottom hook (30) hoist body 10, as well as the load sheave 50 It is possible to fundamentally prevent damage to the limit switch and the limit switch (7, 7 ') is not in direct contact with the load chain 40 and the like to protect the limit switch (7, 7') to ensure a stable operability .

On the other hand, the guide hole 52 formed in a + shape on the holder (5, 5 ') guides the load chain 40 by aligning the load chain 40 to operate the load sheave 50, the lifting and lifting of the load chain 40 It can be stably achieved and can further contribute to the operational stability by blocking unnecessary contact between the rod chain 40 and the over-wound prevention device.

In addition, since the protruding degree (length) of the sensing protrusions 61 and 61 'of the cam lever 6 is determined in proportion to the lifting width of the holders 5 and 5', the sensing protrusions 61 and 61 'are detected. By varying the protruding length of ') it is possible to adjust the over-wound detection range according to the lifting width of the holder (5,5'). Therefore, the over-wound detection range can be selectively adjusted according to various purposes and uses only by replacing the lever (6).

Looking at the symbols used in the accompanying drawings in order to explain the embodiments of the present invention in detail as follows.
10: main body 20: TOP HOOK
30: BOTTOM HOOK 40: LOAD CHAIN
50: LOAD SHEAVE 60: DRIVE MOTOR
70: reduction gear 80: actuator
1: Plate 2: Shaft
3,3 '; Operator 4: LEVER
HOLDER 6: CAM LEVER
7,7 ': limit switch 8: buffer member
The terminology described in the detailed description and claims of the present invention, including the description of the above signs, is used to describe the present invention in the best way, and the description is made in the entire description including the detailed description and claims as well as the drawings. It should be interpreted as meanings and concepts that correspond to ideas, but not necessarily in terms of dictionary meanings, so as not to obscure the meanings and concepts of terms used.

Claims (3)

The lifting chain is guided to the lower part of the load sheave connected to the driving motor of the main body, and the holder is configured to be lifted up by over-winding of the load chain. In the hoist over-wound prevention device configured to detect the over-wound signal by the cam lever is in contact with the limit switch,
The holder is coupled to the lifting operation of the plate central shaft both side operation holes are assembled to the lower part of the main body, and forms a lever on the shaft to couple the engaging projection of the holder to the long hole of the lever to connect the holder to both sides of the lever,
The cam lever is coupled to the shaft of the lever to be interlocked with the shaft rotated by the left and right lifting operation of the lever, and the limit switch is disposed on both sides of the cam lever.
The cam lever on both sides of the cam protrusion protruding sensing projections, characterized in that the upward rotation detection projection of the cam lever is configured to contact the limit switch. The method of claim 1,
The overhang prevention device of the hoist, characterized in that the sensing projection of the cam lever to adjust the over-wound detection range according to the lifting width of the holder by changing the protruding length. delete

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