CN219345323U

CN219345323U - Self-locking device

Info

Publication number: CN219345323U
Application number: CN202223364014.0U
Authority: CN
Inventors: 刘韶华; 于韶红; 尹强; 王收民
Original assignee: QINGDAO HAOMAI XINGLI ELECTRIC POWER EQUIPMENT CO Ltd
Current assignee: QINGDAO HAOMAI XINGLI ELECTRIC POWER EQUIPMENT CO Ltd
Priority date: 2022-12-15
Filing date: 2022-12-15
Publication date: 2023-07-14
Anticipated expiration: 2032-12-15

Abstract

The utility model discloses a self-locking device, which comprises a main body unit and a cam unit, wherein a first through pin shaft hole is formed in the upper edge of the main body unit, and a first key slot is formed in the first through pin shaft hole; the wheel unit comprises a cam, a cam pin shaft, a return spring and a cam torsion spring; the cam is provided with a second through pin shaft hole along the horizontal direction, and a second key groove is formed in the second through pin shaft hole; the cam pin shaft passes through the first through pin shaft hole and the second through pin shaft hole; a key extending along the axial direction of the cam pin shaft is formed on the first end of the cam pin shaft; the cam torsion spring is used for ejecting the cam pin shaft from the first through pin shaft hole and the second through pin shaft hole under the state of no pretightening force; and under the condition that the pretightening force is applied to the cam torsion spring, the cam and the guide rail are in a separated state, and the key is connected in the first key groove and the second key groove. The horizontal guide rail locking device can slide smoothly left and right along the horizontal guide rail when passing through the horizontal guide rail, and automatically restore the locking function when passing through the vertical guide rail.

Description

Self-locking device

Technical Field

The utility model belongs to the technical field of engineering construction tools, and particularly relates to a self-locking device.

Background

The self-locking device is a device capable of locking, and is commonly used for sliding and locking equipment on a vertical rail. Vertical guide rails are arranged in the ultra-high voltage transmission line engineering iron tower, so that safety protection effect is achieved for personnel on the upper tower and the lower tower; the engineering iron tower is provided with a cross arm along the horizontal direction, and the cross arm can be made of steel strands or horizontal guide rails. In the process of overhauling the ultra-high voltage transmission line engineering iron tower, operators have various working conditions, including climbing to the position of a cross arm in the middle of the iron tower from the bottom through a self-locking device along a vertical guide rail on the same tower position, and turning to the position of the cross arm for working; and moving to another tower position along the lead for operation, and then lowering the tower from the vertical guide rail after the operation is completed.

If the operation personnel only carry out the operation on same tower position to the cross arm adopts the horizontal guide to make, under this kind of operation circumstances, the auto-lock ware that is commonly used at present can realize its locking with vertical guide, but when removing along horizontal guide, can't smooth and easy horizontal slip, need dismantle the auto-lock ware from vertical guide.

Therefore, the self-locking device is developed, when the self-locking device passes through the horizontal guide rail, the self-locking device can slide smoothly left and right along the horizontal guide rail, and when the self-locking device passes through the vertical guide rail, the locking function can be automatically recovered, so that the self-locking device is convenient to operate, and the self-locking device is a technical problem to be solved urgently.

Disclosure of Invention

The utility model aims to provide a self-locking device which can smoothly slide left and right along a horizontal guide rail when passing through the horizontal guide rail and can automatically restore a locking function when passing through a vertical guide rail, so that convenient operation is realized.

The self-locking device is used for being connected with or locked on a guide rail in a sliding mode and comprises a main body unit and a cam unit, wherein a first through pin shaft hole is formed in the main body unit, and a first key groove is formed in the first through pin shaft hole; the wheel unit comprises a cam, a cam pin shaft, a return spring and a cam torsion spring; the cam is provided with a second penetrating pin shaft hole, a second key groove is formed in the second penetrating pin shaft hole, and the cam is used for propping against or separating from the guide rail; the cam pin shaft passes through the first through pin shaft hole and the second through pin shaft hole; a key extending along the axial direction of the cam pin shaft is formed on the first end of the cam pin shaft; the two ends of the cam torsion spring are respectively connected with the cam and the main body unit, and the cam torsion spring is used for applying pretightening force between the cam and the main body unit; the cam torsion spring is used for ejecting the cam pin shaft from the first through pin shaft hole and the second through pin shaft hole in a state without pretightening force; and in a state that the pretightening force is applied to the cam torsion spring, the cam and the guide rail are in a separated state, and the key is connected in the first key groove and the second key groove.

In some embodiments of the present application, the first end of the cam pin is formed with a first annular stop; the reset spring is sleeved outside the first end of the cam pin shaft, one end of the reset spring is connected with the first annular stop, and the other end of the reset spring is connected with the main body unit.

In some embodiments of the present application, the cam torsion spring is sleeved outside the second end of the cam pin shaft; one end of the cam torsion spring is connected with the main body unit, and the other end of the cam torsion spring is connected with the cam.

In some embodiments of the present application, the locking device further comprises a locking block unit, wherein the locking block unit comprises two locking blocks, and the two locking blocks are oppositely arranged at two sides of the main body unit.

In some embodiments of the present application, a sliding groove is formed on a side, close to the main body unit, of the locking block; the chute is movable along the guide rail.

In some embodiments of the present application, a first guide wheel and a second guide wheel are rotatably connected at the side surface of the chute; the first guide wheel and the second guide wheel are rotatably connected with the side surfaces of the guide rail.

In some embodiments of the present application, a third guide wheel is rotatably connected to the main body unit, and the third guide wheel is in contact with the outer surface of the guide rail.

In some embodiments of the present application, a limiting portion is formed on the first guide wheel, and the limiting portion is used for rolling contact with an inner surface of the guide rail.

Compared with the prior art, the utility model has the advantages and positive effects that:

the cam, the main body unit and the cam pin shaft are connected through keys, a cam torsion spring is arranged between the cam and the main body unit, a return spring is arranged between the cam pin shaft and the main body unit, the return spring ejects the cam pin shaft under the state that the cam torsion spring has no pretightening force, and the angle locking of the cam is released, so that an operator can rotate the cam to lock the self-locking device on the guide rail in the moving process along the vertical guide rail; under the state that the pretightning force is exerted to the cam torsional spring, can guarantee the cam round pin axle and cam, the stable connection of main part unit, realize the angle locking of cam in the position that does not contact with the guide rail for at the operating personnel in the in-process of moving along horizontal guide rail, can smooth and easy removal.

Other features and advantages of the present utility model will become apparent upon review of the detailed description of the utility model in conjunction with the drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of an embodiment of a self-locking device according to the present utility model;

FIG. 2 is a top view of one embodiment of a self-locking device according to the present utility model;

FIG. 3 is a cross-sectional view at A-A in FIG. 2;

FIG. 4 is a cross-sectional view at B-B in FIG. 2;

FIG. 5 is a cross-sectional view at C-C in FIG. 2;

FIG. 6 is a side view of one embodiment of a self-locking device in accordance with the present utility model;

FIG. 7 is a front view of one embodiment of a self-locking device in accordance with the present utility model;

FIG. 8 is a schematic diagram showing the overall structure of a main body unit of an embodiment of a self-locking device according to the present utility model;

FIG. 9 is a schematic view of the overall structure of a cam of an embodiment of a self-locking device according to the present utility model;

FIG. 10 is a schematic view of the overall structure of a cam pin of an embodiment of a self-locking device according to the present utility model;

FIG. 11 is a top view of a self-locking device according to the present utility model, not including a locking clip spring unit;

FIG. 12 is a front view of a self-locking device according to the present utility model, not including a locking clip spring unit;

in the drawing the view of the figure,

100, a main body unit;

110, penetrating the locking hole;

120, connecting holes;

121, an annular baffle ring;

1211, a second channel;

130, a first rail;

131, a second stop;

140, a lock block spring first connecting hole;

150, a third guide wheel;

160, a first through pin bore;

161, a first keyway;

200, a cam unit;

210, a cam;

211, a second through pin hole;

212, a second keyway;

213, working holes;

220, cam pin shafts;

221, a key;

222, a second annular stop;

223, a first annular stop;

230, a return spring;

240, cam torsion springs;

300, a locking block unit;

310, a locking piece assembly;

311, locking blocks;

3111, a third guide slot;

3112, a first stop;

3113, chute;

3114, first guide wheels;

3115, second guide wheels;

3116 a limit portion;

312, locking block springs;

400, locking a clamp spring unit;

410, locking the clamp spring assembly;

411, locking the snap spring sleeve;

4111, a first guide slot;

412, locking the jump ring spring piece;

420, locking the jump ring starting assembly;

4121 a locking portion;

4122 a pushing part;

421, a start button;

4211, annular stop;

422, a return spring.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be mechanically coupled, directly coupled, or indirectly coupled via an intermediate medium. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.

The existing common self-locking device cannot be applied to all the working conditions, operators need to prepare various self-locking devices, different self-locking devices are selected according to different working environments, and meanwhile, temporary burst tasks cannot be responded quickly.

In this embodiment, relate to a self-locking device, can deal with multiple operation condition, can enough follow the convenient dismantlement on the vertical guide rail, can realize simultaneously moving to the vertical guide rail along the horizontal guide rail on the automatic re-setting of self-locking device, improve the commonality of self-locking device.

In this embodiment, as shown in fig. 1, 2, 3, 4, 5, 6, 7, 11, and 12, the self-locker includes a main body unit 100, a cam unit 200, a lock block unit 300, and a locking clip unit 400.

In order to ensure that an operator can smoothly move in the process of moving along the horizontal guide rail, and the self-locking device can realize the automatic recovery locking function after moving to the vertical guide rail after passing through the steering gear,

as shown in fig. 8, 10, 11, and 12, a first through-pin shaft hole 160 is formed in the main body unit 100, and a first key groove 161 is formed in the first through-pin shaft hole 160.

The first key groove 161 is provided along an axial extension of the first through pin shaft hole 160.

The cam unit 200 includes a cam 210, a cam pin 220, a return spring 230, and a cam torsion spring 240.

As shown in fig. 9, the cam 210 is provided with a second through pin hole 211, and the second through pin hole 211 is provided with a second key groove 212.

The second key groove 212 is provided to extend in the axial direction of the second through pin hole 211.

A key 221 extending in the axial direction of the cam pin 220 is formed on a first end of the cam pin 220.

The cam pin 220 passes through the first and second through

pin holes

160 and 211.

By rotating the cam 210 relative to the main body unit 100, the cam 210 is abutted against or separated from the guide rail, and locking and unlocking of the self-locking device and the rail are realized.

Both ends of the cam torsion spring 240 are connected with the cam pin 220 and the body unit 200, respectively.

The cam torsion spring 240 may form a pre-tightening force between the cam pin 220 and the body unit 100.

The cam torsion spring 240 may also be connected between the cam pin 220 and the body unit 100 without a preload force.

The first end of the cam pin 220 is formed with a first annular stop 223.

A second end of the cam pin 220 is formed with a second annular stop 222.

The return spring 230 is sleeved outside the first end of the cam pin 220. One end of the return spring 230 is connected to the first annular stopper 223, and the other end of the return spring 230 is connected to the body unit 100.

The cam torsion spring 240 is sleeved outside the second end of the cam pin 220. One end of the cam torsion spring 240 is connected to the cam 210, and the other end of the cam torsion spring 240 is connected to the body unit 100.

The return spring 230 pushes the cam pin 220 to pop out from the first and second through

pin holes

160 and 211 in a state that the cam torsion spring 240 is in a state of no pre-tightening force.

The key 221 is connected to the first key groove 161 and the second key groove 212 in a state where the cam torsion spring 240 is in a state where a preload is applied. At this time, the cam 210 is not in contact with the guide rail.

The cam 210 can apply a force to the body unit 200 through the cam pin 220 due to the pre-tightening force of the cam torsion spring 240. The key 221 abuts against the first key groove 161 and the second key groove 212, and prevents the cam pin 220 from being pushed out of the first through pin shaft hole 160 and the second through pin shaft hole 211 by the return spring 230.

During the operation of the operator along the horizontal guide rail, the cam pin 220 is pushed into the first and second through pin shaft holes 160 and 211 so that the key 221 is connected in the first and second key grooves 161 and 212, in this state, the cam 210 is not in contact with the guide rail, the cam torsion spring 240 is in a pre-loaded state, and the angle of the cam 210 with respect to the main body unit 100 is locked.

Because the operator is connected with the operation hole 213 formed on the cam 210 through the safety rope, the operator applies force to the cam 210 through the safety rope in the process of moving along the horizontal guide rail, if the safety rope lifts the cam 210 relative to the main body unit 100, the pretightening force of the cam torsion spring 240 is released, the cam torsion spring 240 is in a state without pretightening force, at this time, the cam pin 220 pops out from the first through pin hole 160 and the second through pin hole 211, and the position locking of the cam 210 fails, at this time, if the operator continuously moves along the direction of lifting the cam 210, at this time, the cam 210 is in an unlocked state relative to the guide rail, and the operator can freely and smoothly move. At this time, when the operator moves in a direction to push down the cam 210 with respect to the main body unit 100, the cam 210 is locked on the guide rail, and therefore, at this time, the cam pin 220 needs to be pushed into the first through pin hole 160 and the second through pin hole 211 again, so that the key 221 is connected into the first key groove 161 and the second key groove 212, the cam torsion spring 240 regains the pre-tightening force, and the position of the cam 210 is locked, and at this time, the cam 210 is separated from the guide rail. Thereby, the cam 210 and the guide rail keep an unlocked state in the process that the operator continuously moves along the direction of pressing down the cam 210, and smooth movement of the operator is ensured. Thus, the operator can smoothly move the cam 210 by applying forces in different directions to the cam via the safety rope, regardless of the movement of the operator along the horizontal guide rail.

When an operator turns the horizontal guide rail to the vertical guide rail through the diverter, the operator is connected to the working hole 213 of the cam 210 through the safety rope, and the self-locker moves downwards relative to the operator along the vertical direction under the action of gravity, so that the safety rope lifts the cam 210 up through the working hole 213, the pretightening force of the cam torsion spring 240 disappears, and the reset spring 230 can push the first end of the cam pin 220 to pop out from the first through pin shaft hole 160 and the second through pin shaft hole 211. Thereby, the key 221 is ejected from the first key groove 161 and the second key groove 212, and the locking connection between the key 221 and the first key groove 161 and the second key groove 212 is released. Thereby enabling the cam 210 to rotate with respect to the body unit 100. In this state, when the self-locker is coupled to the vertical rail, the cam 210 resumes the locking function due to the gravity. Therefore, when the operator turns the vertical rail from the horizontal rail through the steering gear, the locking function of the self-locking gear is restored.

In other embodiments, to enable the self-locking device to be easily removed from a rail and easily reinstalled on another rail, the lock block unit 300 is designed to include two lock block assemblies 310, with the two lock block assemblies 310 being slidably coupled to both sides of the body unit 100.

The locking clamp spring unit 400 is designed to include two locking clamp spring assemblies 410, and the locking block assemblies 310 on two sides of the two locking clamp spring assemblies 410 can be respectively located away from the main body unit 100, so that the position locking of the two locking clamp spring assemblies 410 and the main body unit 100 is released.

The two locking block assemblies 310 are respectively pushed towards the direction of the main body unit 100, so that the two locking clamp spring assemblies 410 can be pushed to move close to the main body unit 100 until the two locking clamp spring assemblies 410 are locked with the main body unit 100.

In this embodiment, a through locking hole 110 is formed in the main body unit 100 along a horizontal direction, and the through locking hole 110 is used for installing two locking clip assemblies 410. Two locking circlip assemblies 410 are slidably coupled within through-lock aperture 110.

In this embodiment, the lock hole unit 300 further includes a lock clip activation assembly 420. The latch spring actuation assembly 420 pushes the two latch block assemblies 310 out of position locking with the main body unit 100 and moves the two latch hole assemblies 310 away from the main body unit 100.

In order to install the locking clip starting assembly 420, a connection hole 120 is formed in the main unit 100.

The connection hole 120 communicates with the through-locking hole 110.

The latch spring activation assembly 420 pushes the two latch spring assemblies 410 slidably coupled within the through-lock hole 110 through the coupling hole 120.

In this embodiment, the latch clip assembly 410 includes a latch clip sleeve 411 and a latch clip spring piece 412.

Two locking snap spring sleeves 411 are respectively installed in the through-locking hole 110 from both ends of the through-locking hole 110.

The end of the locking snap spring sleeve 411 remote from the main body unit 100 is connected to the adjacent locking block assembly 310 by bolts.

A first guide groove 4111 is formed in the locking clip sleeve 411 so as to extend from a position near the center of the main body unit 100 in the longitudinal direction of the locking clip sleeve 411.

The lock spring piece 412 has a lock portion 4121 formed at an end portion near the center of the main body unit 100, and a push portion 4122 formed at an end portion far from the center of the main body unit 100.

Two locking portions 4121 are located at the communication between the connection hole 120 and the through-locking hole 110.

An annular baffle ring 121 is formed on the inner wall of the connection hole 120, and the connection hole 120 is communicated with the through-locking hole 110 after passing through the annular baffle ring 121.

A second guide groove 1211 is provided on the annular stopper ring 121 at a position corresponding to the two first guide grooves 4111.

After the locking portion 4121 passes through the first guide groove 4111 and extends out of the locking clamp spring sleeve 411 and passes through the second guide groove 1211, the locking portion 4121 abuts against the inner wall of the connecting hole 120, so that the locking clamp spring piece 412 and the main body unit 100 are locked in position.

In this embodiment, the latch spring activation assembly 420 includes an activation button 421 and a return spring 422.

The middle of the start button 421 is formed with a ring-shaped stopper 4211. The lower end of the return spring 422 from the starting button 421 is sleeved outside the starting button 421, and the upper end of the return spring 422 abuts against the annular stop 4211. The lower end of the return spring 422 is attached to the annular retainer 121.

The lower end of the actuation button 421 protrudes from the annular stop 4211 into the through-lock hole 110. When the operator pushes the start button 421, the lower end of the start button 421 abuts against the two locking portions 4121, and the locking portions 4121 are pushed to unlock the main body unit 100.

After the unlocking, the two lock jump ring spring pieces 412 move to both sides, and the pushing portions 4122 on both sides push the lock block assemblies 310 on both sides, respectively. The two lock block assemblies 310 move away from their centers with respect to the main body unit 100.

To enable the lock block assembly 310 to be ejected with respect to both sides of the body unit 100, a lock block 311 and a plurality of lock block springs 312 are included in the lock block assembly 310.

A lock block spring 312 is installed between the lock block 311 and the body unit 100, and the lock block spring 312 urges the lock block 311 to pop up when the lock block 311 is away from the center of the body unit 100 with respect to the body unit 100.

Specifically, the plurality of lock springs 312 are disposed at intervals along the length direction of the body unit 100.

In the present embodiment, in order to achieve the installation of the lock block spring 312, lock block spring first connection holes 140 are provided at intervals on both sides of the main body unit 100.

The locking block spring 312 is installed in the locking block spring first connecting hole 140, and two ends of the locking block spring 312 are respectively connected with the locking block spring first connecting hole 140 and the locking block 311.

In the present embodiment, in order to achieve the sliding connection between the lock block 311 and the main body unit 100, a third guide groove 3111 is provided along the length direction thereof on the side of the lock block 311 near the main body unit 100, and a first stopper 3112 is provided on the side of the third guide groove 3111 near the center of the main body unit 100. The two sides of the main body unit 100 are provided with first guide rails 130 along the length direction, and one side of the first guide rails 130 far away from the main body unit 100 is provided with a second stop 131.

The first guide rail 130 is installed in the third guide groove 3111, and the second stopper 131 is located in the third guide groove 3111. The first stopper 3112 can prevent the second stopper 131 from sliding out of the third guide groove 3111, thereby functioning as a relative position between the lock block 311 and the main body unit 100.

Specifically, the first connecting hole 140 of the locking block spring is formed in the third guide groove 3111.

The first connecting hole 140 of the locking block spring is formed on the first guide rail 130.

In order to connect the locking block 311 with the guide rail, a chute 3113 is formed on a side of the locking block 311 near the main body unit 100.

The slide grooves 3113 formed in the two lock blocks 311 can move along the guide rail.

To reduce friction between the two lock blocks 311 and the chute 3113, a first guide wheel 3114 and a second guide wheel 3115 are rotatably connected at the side of the chute 3113.

The first guide wheel 3114 and the second guide wheel 3115 are rotatable along guide rails.

The first guide wheel 3114 is formed with a stopper 3116, and the stopper 3116 contacts an inner surface of the guide rail.

A third guide wheel 150 is rotatably connected to the surface of the main body unit 100 near the guide rail, and the third guide wheel 150 is in rolling contact with the outer side surface of the guide rail.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims

1. A self-locking device for sliding connection or locking on a guide rail, comprising:

the main body unit is provided with a first through pin shaft hole, and a first key groove is formed in the first through pin shaft hole;

a cam unit, comprising:

a cam, on which a second through pin shaft hole is formed, a second key slot being formed on the second through pin shaft hole, the cam being for abutting against or separating from the guide rail;

-a cam pin passing through the first through pin hole, the second through pin hole; a key extending along the axial direction of the cam pin shaft is formed on the first end of the cam pin shaft;

-a return spring;

the two ends of the cam torsion spring are respectively connected with the cam and the main body unit, and the cam torsion spring is used for applying pretightening force between the cam and the main body unit;

the cam torsion spring is used for ejecting the cam pin shaft from the first through pin shaft hole and the second through pin shaft hole in a state without pretightening force; and in a state that the pretightening force is applied to the cam torsion spring, the cam and the guide rail are in a separated state, and the key is connected in the first key groove and the second key groove.

2. The self-locking device according to claim 1, wherein,

a first annular stop is formed at the first end of the cam pin shaft; the reset spring is sleeved outside the first end of the cam pin shaft, one end of the reset spring is connected with the first annular stop, and the other end of the reset spring is connected with the main body unit.

3. The self-locking device according to claim 1, wherein,

the cam torsion spring is sleeved outside the second end of the cam pin shaft; one end of the cam torsion spring is connected with the main body unit, and the other end of the cam torsion spring is connected with the cam.

4. The self-locker of claim 1, further comprising a locking block unit comprising two locking blocks, the two locking blocks being oppositely disposed on both sides of the main body unit.

5. The self-locking device according to claim 4, wherein,

a chute is formed in one side, close to the main body unit, of the locking block;

the chute is movable along the guide rail.

6. The self-locker of claim 5, wherein a first guide wheel and a second guide wheel are rotatably connected at the side of the chute; the first guide wheel and the second guide wheel are rotatably connected with the side surfaces of the guide rail.

7. The self-locking device according to claim 5, wherein a third guide wheel is rotatably connected to the main body unit, and the third guide wheel is in contact with an outer surface of the guide rail.

8. The self-locker of claim 6, wherein the first guide wheel is formed with a limit portion for rolling contact with an inner surface of the guide rail.