Unhooking prevention device

Abstract

The utility model discloses an anti-unhooking device, and relates to the technical field of hoisting. The mounting block is sleeved with the top end of the lifting hook; positioning protrusions are arranged on the surfaces, positioning holes are formed in the lateral surfaces, positioning grooves are formed in the surfaces of the connecting plates, positioning holes are formed in the inner surfaces of the positioning grooves, and first through grooves are formed in the surfaces of the connecting plates after the positioning protrusions extend into the positioning grooves till the positioning holes are aligned; the anti-falling plate is nested on the outer surface of the connecting plate, the anti-falling plate moves linearly along the outer surface of the connecting plate, a second through groove is formed in the surface of the anti-falling plate, the first through groove and the second through groove are partially overlapped and aligned and then movably connected through a bolt, and the end of the anti-falling plate extends out of the connecting plate and abuts against the surface of the lifting hook. By means of the linear motion design of the sliding strip and the sliding groove, the device does not depend on spring torsion any more, the force needed by operation is reduced, the device is particularly suitable for large-tonnage lifting hook scenes, the working efficiency is improved, and the probability of safety accidents caused by the fact that workers remove the anti-unhooking device due to troublesome use is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hoisting technical field, and specifically relates to a kind of anti-unhooking device. BACKGROUND

[0002] The hook is a hook ring or hook with chain or rope, and is often suspended on the steel wire rope of the lifting mechanism by means of a pulley block and other components in the hoisting machinery, and is suitable for various use scenarios such as factories, mines, petroleum, chemical industry and ship wharf.

[0003] The anti-unhooking device for hook is a device for protecting the hoisting steel wire rope from unhooking. It can prevent the falling accident of hoisted objects, especially when hoisting long objects or special objects. The conventional anti-unhooking device generally has a shaft of a anti-unhooking plate hinged to the hooking part of the hook, and then relies on the torsional force of a spring to tightly abut the anti-unhooking plate against the hook to achieve the effect of preventing unhooking. When the rigging or object needs to be taken out, the anti-unhooking plate is manually pressed to create a certain distance between the anti-unhooking plate and the hook, and then the rigging can be taken out.

[0004] However, in use, a large force is needed to overcome the torsional force of the spring during use, which is laborious, especially for large-tonnage hooks, which makes the operation inconvenient and affects the work efficiency, so workers are reluctant to install the anti-unhooking device. In addition, the anti-unhooking device is usually made of thin steel plate and is directly installed at the hook opening of the hook. During work, deformation and extrusion often occur, which leads to damage of the anti-unhooking device.

[0005] According to the search, the invention with publication number CN117864945A provides an anti-unhooking device and a using method thereof. The anti-unhooking device comprises a base, one end of the base is a connecting end movably connected with the hook, the other end of the base is a free end, the connecting end of the base has a blocking part, and the free end is provided with a accommodating groove along the length direction. An anti-unhooking strip is arranged in the accommodating groove, one end of the anti-unhooking strip extends out of the base and abuts against the hook. The invention uses a limiting part to abut against the anti-unhooking strip, and uses gravity for natural limiting. Since no spring is installed, the problem of inconvenient operation is solved. However, due to the lack of protection measures, deformation is likely to occur during use, and the anti-unhooking strip is difficult to replace after deformation. SUMMARY

[0006] In order to solve the problems of inconvenient operation and lack of protection device leading to deformation of the traditional anti-unhooking device for hook, the utility model provides an anti-unhooking device to solve the above problems.

[0007] An anti-unhooking device comprises a mounting block, the mounting block is sleeved with the top end of the hook, a positioning protrusion is arranged on the surface of the mounting block, and a positioning hole is arranged on the lateral surface of the positioning protrusion.

[0008] The connecting plate is movably connected with the mounting block, and a first through groove is formed in a surface of the connecting plate away from the positioning groove.

[0009] The anti-disengagement plate is nested on an outer surface of the connecting plate, linearly moves along the outer surface of the connecting plate, and is movably connected with the connecting plate through bolts after the first through groove and a second through groove formed in the anti-disengagement plate are partially overlapped and aligned.

[0010] The anti-disengagement plate is nested on an outer surface of the connecting plate, linearly moves along the outer surface of the connecting plate, and is movably connected with the connecting plate through bolts after the first through groove and a second through groove formed in the anti-disengagement plate are partially overlapped and aligned.

[0011] The anti-disengagement plate is nested on an outer surface of the connecting plate, linearly moves along the outer surface of the connecting plate, and is movably connected with the connecting plate through bolts after the first through groove and a second through groove formed in the anti-disengagement plate are partially overlapped and aligned.

[0012] The anti-disengagement plate is nested on an outer surface of the connecting plate, linearly moves along the outer surface of the connecting plate, and is movably connected with the connecting plate through bolts after the first through groove and a second through groove formed in the anti-disengagement plate are partially overlapped and aligned.

[0013] The anti-disengagement plate is nested on an outer surface of the connecting plate, linearly moves along the outer surface of the connecting plate, and is movably connected with the connecting plate through bolts after the first through groove and a second through groove formed in the anti-disengagement plate are partially overlapped and aligned.

[0014] The anti-disengagement plate is nested on an outer surface of the connecting plate, linearly moves along the outer surface of the connecting plate, and is movably connected with the connecting plate through bolts after the first through groove and a second through groove formed in the anti-disengagement plate are partially overlapped and aligned.

[0015] The anti-disengagement plate is nested on an outer surface of the connecting plate, linearly moves along the outer surface of the connecting plate, and is movably connected with the connecting plate through bolts after the first through groove and a second through groove formed in the anti-disengagement plate are partially overlapped and aligned.

[0016] The anti-disengagement plate is nested on an outer surface of the connecting plate, linearly moves along the outer surface of the connecting plate, and is movably connected with the connecting plate through bolts after the first through groove and a second through groove formed in the anti-disengagement plate are partially overlapped and aligned.

[0017] The anti-disengagement plate is nested on an outer surface of the connecting plate, linearly moves along the outer surface of the connecting plate, and is movably connected with the connecting plate through bolts after the first through groove and a second through groove formed in the anti-disengagement plate are partially overlapped and aligned.

[0018] The anti-disengagement plate is nested on an outer surface of the connecting plate, linearly moves along the outer surface of the connecting plate, and is movably connected with the connecting plate through bolts after the first through groove and a second through groove formed in the anti-disengagement plate are partially overlapped and aligned.

[0019] The anti-falling plate is in a C-shaped structure, and the inner wall is provided with a first limiting block and a second limiting block, which form a sliding groove. After the sliding bar is embedded in the sliding groove, the anti-falling plate can slide linearly along the sliding groove.

[0020] The side surface of the connecting plate is provided with a sliding bar matched with the sliding groove of the anti-falling plate, so that the anti-falling plate moves linearly and is prevented from deviating and being stuck.

[0021] The anti-falling plate is provided with a counterweight at the bottom, and the counterweight is a magnet.

[0022] The magnet counterweight is installed at the bottom to increase the weight of the anti-falling plate, and the position is further fixed under the adsorption of the magnet layer of the blocking part to prevent accidental displacement in the shaking working condition.

[0023] The mounting block, the connecting plate and the anti-falling plate are covered with a rust-proof coating. The rust-proof coating covers the key components, prolongs the service life of the device in a humid and corrosive environment, and reduces the failure caused by rust.

[0024] A use method of the anti-falling hook device, comprising the following steps:

[0025] S1, installation preparation:

[0026] Check the cleanliness of the surface of the hook to ensure that there is no oil stain or rust to avoid affecting the stability of the sleeve connection of the mounting block. Select a suitable mounting block according to the size of the hook, sleeve it on the top end of the hook, and ensure that the anti-collision side plate is symmetrically attached to both sides of the hook neck.

[0027] S2, connecting plate and mounting block assembly: align the positioning groove of the connecting plate with the positioning protrusion of the mounting block, slowly push it in until the positioning holes are completely aligned; insert the fixed pin through the positioning hole, and tighten the fixed head to complete the connection.

[0028] S3, anti-falling plate installation and adjustment: align the sliding groove of the anti-falling plate with the sliding bar of the connecting plate, push it in along a straight line until the end of the anti-falling plate abuts against the inner wall of the hook mouth, adjust the position of the anti-falling plate so that the first through slot and the second through slot partially overlap, insert the bolt and tighten it, fix the relative position of the anti-falling plate and the connecting plate, check whether the magnet counterweight at the bottom of the anti-falling plate is adsorbed tightly with the magnet layer of the blocking part, and if necessary, slightly adjust the angle of the anti-falling plate. After completion, loosen the bolt to the extent that the anti-falling plate can move along the surface of the connecting plate, and the nut of the bolt uses two nuts with opposite threads.

[0029] S4, anti-falling function verification:

[0030] Manually pull the anti-falling plate and slide it to the maximum stroke along the sliding groove to simulate the movement state of the anti-falling plate in the hoisting process, ensure that there is no jamming or looseness, load the test load, and observe whether the anti-falling plate remains in close abutment with the hook body when the hook is stressed, and whether the magnetic attraction force is sufficient to resist shaking.

[0031] S5, maintenance and replacement: regular cleaning of the chute and the impurities between the slide, smear of grease, to ensure smooth sliding, if the anti-off plate deformation, only need to loosen the bolts, along the chute out of the old plate, replace the new plate after re-fixing, without disassembling the entire device.

[0032] Compared with the prior art, the utility model has the following beneficial effects:

[0033] 1. Convenient operation and efficient maintenance

[0034] Through the chute-slip mechanical structure and spring-free design, the operation force is significantly reduced, and the anti-off plate can be opened and closed with one hand, especially suitable for large tonnage hook scenes. Modular design makes maintenance more convenient, the connecting plate and the anti-off plate are connected through the positioning hole, bolts and other detachable structures, damaged parts can be replaced independently, greatly reducing downtime.

[0035] 2. Impact resistance and durability optimization

[0036] High-strength alloy steel anti-collision side plates and round corner structures are adopted to effectively disperse collision stress and resist lifting impact. The surface of the key components is covered with a double-layer anti-rust coating, the slide and the chute are made of hardened steel and polyethylene lining, which has wear resistance and corrosion resistance, and is suitable for high-corrosion environments such as offshore and chemical industries.

[0037] 3. Safety protection and full working condition adaptation

[0038] Physical limiting and magnetic attraction double protection mechanism ensure safety: the end of the anti-off plate rigidly blocks the sling from coming out, and the magnet counterweight and the blocking part magnetic layer work together to resist shaking. The length of the chute is adjustable, the positioning protrusions are adapted in distance, and the gravity self-adaptive design makes it still stable and close to the hook in complex working conditions such as inclination and vibration.

[0039] 4. Economic benefits and comprehensive advantages

[0040] Modular design reduces the cost of replacing parts, reduces maintenance costs, prolongs the service life of the device, and reduces the need for frequent replacement. From operation efficiency, safety to environmental adaptability, this device fully solves the pain points of traditional anti-off hook devices, and provides an integrated solution that is efficient, durable and economical for mine, port, offshore platform and other scenes. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0042] Figure 1 It is a working state structure schematic diagram of an anti-off hook device.

[0043] Figure 2 is Figure 1 is an enlarged view of the middle B part;

[0044] Figure 3 is another working state structure diagram of the anti-unhooking device;

[0045] Figure 4 is Figure 3 is an enlarged view of the middle A part;

[0046] Figure 5 is a working state front view of the anti-unhooking device;

[0047] Figure 6 is a perspective view of the mounting block;

[0048] Figure 7 is a perspective view of the connecting plate;

[0049] Figure 8 is a perspective view of the anti-unhooking plate.

[0050] in the figure:

[0051] 1, the hook body;

[0052] 2, the mounting block;201, the anti-collision side plate;202, the positioning protrusion;203, the mounting hole;204, the positioning hole;

[0053] 3, the fixing pin;

[0054] 4, the fixing head;

[0055] 6, the connecting plate;602, the sliding bar;603, the positioning groove;604, the first through groove;

[0056] 7, the anti-unhooking plate;701, the first limiting block;702, the second limiting block;703, the second through groove;

[0057] 8, the blocking part. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0059] The application principle of the present application will be further described below in combination with the drawings and specific embodiments.

[0060] Embodiment 1

[0061] As Figures 1-5As shown, an anti-disengagement device includes a mounting block 2; the mounting block 2 is sleeved with the top of the hook; the surface of the mounting block 2 is provided with a positioning protrusion 202, and the side surface of the positioning protrusion 202 is provided with a positioning hole 204;

[0062] A connecting plate 6 is provided with a positioning groove 603 on its surface. A positioning hole 204 is provided on the inner surface of the positioning groove 603. The positioning protrusion 202 extends into the positioning groove 603 until the positioning hole 204 is aligned. The connecting plate 6 is movably connected to the mounting block 2. A first through groove 604 is provided on the side of the connecting plate 6 away from the positioning groove 603.

[0063] Anti-detachment plate 7 is nested on the outer surface of the connecting plate 6. The anti-detachment plate 7 moves linearly along the outer surface of the connecting plate 6. A second through groove 703 is provided on the surface of the anti-detachment plate 7. The first through groove 604 and the second through groove 703 are partially overlapped and aligned and then connected by bolts. The end of the anti-detachment plate 7 extends out of the connecting plate 6 and abuts against the surface of the hook.

[0064] By using the movable connection plate 6 and anti-detachment plate 7, and utilizing the linear motion design of the slide bar 602 and the slide groove, the reliance on spring torque is eliminated, reducing the force required for operation. This is especially suitable for large-tonnage hook scenarios, improving work efficiency and reducing the probability of safety accidents caused by workers removing the anti-detachment device due to its inconvenience.

[0065] Each component is connected by a detachable structure such as positioning holes 204 and sliding grooves. If the anti-detachment plate 7 is damaged, it can be replaced individually without the need for overall disassembly, thus reducing maintenance costs.

[0066] It also includes at least one blocking part 8, which is fixedly installed on the surface of the hook, and the surface of the blocking part 8 is provided with a magnet layer.

[0067] It is fixed to the inside of the hook opening and covered with a magnetic layer. When the end of the anti-detachment plate 7 abuts against the hook, the magnetic attraction helps to keep the anti-detachment plate tightly attached to the hook body, forming a double anti-detachment protection.

[0068] Example 2

[0069] like Figures 1-6 As shown, based on Embodiment 1, the positioning protrusion 202 is symmetrically arranged along the central axis of the connecting plate 6, and the positioning hole 204 is symmetrically distributed along the central axis of the connecting plate 6.

[0070] It also includes a crash protection side plate 201, which is fixedly installed on the surface of the mounting block 2. The crash protection side plate 201 is symmetrically distributed on both sides of the positioning protrusion 202, and the edge of the crash protection side plate 201 away from the positioning protrusion 202 is rounded.

[0071] Both sides of the fixed anti-collision side plate 201, using high strength alloy material, edge round treatment, reduce the stress concentration caused by collision in the process of lifting, protect the integrity of the positioning convex structure.

[0072] Embodiment 3

[0073] As Figures 1-8 shown, an anti-unhooking device, comprising a mounting block 2; the mounting block 2 is sleeved with the top end of the hook; the surface of the mounting block 2 is provided with a positioning convex 202, and the lateral surface of the positioning convex 202 is provided with a positioning hole 204;

[0074] A connecting plate 6, the surface of the connecting plate 6 is provided with a positioning groove 603, the inner surface of the positioning groove 603 is provided with a positioning hole 204, the positioning convex 202 extends into the positioning groove 603 until the positioning hole 204 is aligned, the connecting plate 6 is movably connected with the mounting block 2, and the surface of the side of the connecting plate 6 away from the positioning groove 603 is provided with a first through groove 604;

[0075] An anti-unhooking plate 7, the anti-unhooking plate 7 is nested on the outer surface of the connecting plate 6, the anti-unhooking plate 7 moves linearly along the outer surface of the connecting plate 6, the surface of the anti-unhooking plate 7 is provided with a second through groove 703, the first through groove 604 and the second through groove 703 are partially overlapped and aligned, and are movably connected through bolts, and the end of the anti-unhooking plate 7 extends out of the connecting plate 6 and abuts against the surface of the hook.

[0076] Through the movably connected connecting plate 6 and the anti-unhooking plate 7, the linear motion design of the slide bar 602 and the slide groove is used, the dependence on the spring torsion force is reduced, the required force for operation is reduced, it is especially suitable for large-tonnage hook scenes, the working efficiency is improved, and the probability of safety accidents caused by the removal of the anti-unhooking device due to the trouble of use is reduced.

[0077] The components are connected through the positioning hole 204 and the slide groove and the like detachable structure, the anti-unhooking plate 7 can be replaced individually without the need for overall disassembly, and the maintenance cost is reduced.

[0078] Further comprising at least one blocking part 8, the blocking part 8 is fixedly installed on the surface of the hook, and the surface of the blocking part 8 is provided with a magnet layer.

[0079] The blocking part 8 is fixedly installed on the inner side of the hook mouth, and the surface is covered with a magnet layer. When the end of the anti-unhooking plate 7 abuts against the hook, the magnetic attraction force helps to keep the anti-unhooking plate close to the hook body, forming double anti-unhooking protection.

[0080] The positioning convex 202 is symmetrically arranged along the central axis of the connecting plate 6, and the positioning holes 204 are symmetrically distributed along the central axis of the connecting plate 6.

[0081] Further comprising anti-collision side plates 201 fixedly installed on the surface of the mounting block 2, which are symmetrically distributed on both sides of the positioning protrusions 202, and the edge of the side of the anti-collision side plates 201 away from the positioning protrusions 202 is rounded.

[0082] The anti-collision side plates 201 on both sides are made of high-strength alloy material and are rounded at the edges to reduce stress concentration caused by collision during hoisting and protect the integrity of the positioning protrusion structure.

[0083] Two blocking portions 8 are arranged, and the end of the anti-falling plate 7 is located between the two blocking portions 8 and abuts against the surface of the hook body 1 during work, or extends into the opening inside the hook body 1 and abuts against the surface of the innermost blocking portion 8 or the surface of the hook body 1.

[0084] The lateral surface of the connecting plate 6 is provided with a sliding strip 602.

[0085] The anti-falling plate 7 is in a C shape, the opening edge of the C shape is provided with a first limiting block 701, and the inner surface of the C shape is provided with a second limiting block 702 close to one side of the opening, and the first limiting block 701 and the second limiting block 702 form a sliding groove, and when the anti-falling plate 7 is connected with the connecting plate 6, the sliding strip 602 extends into the sliding groove and moves linearly along the inner surface of the sliding groove.

[0086] The anti-falling plate is in a C shape, and the inner wall is provided with a first limiting block 701 and a second limiting block 702, which form a sliding groove. After the sliding strip 602 is embedded in the sliding groove, the anti-falling plate can slide linearly along the sliding groove.

[0087] The lateral surface of the connecting plate is provided with a sliding strip 602, which cooperates with the sliding groove of the anti-falling plate 7 to ensure that the anti-falling plate moves linearly and avoids deviation and jamming.

[0088] The anti-falling plate 7 is provided with a counterweight at the bottom, and the counterweight is a magnet.

[0089] The magnet counterweight is installed at the bottom to increase the weight of the anti-falling plate, and further fix the position under the adsorption of the magnet layer of the blocking portion 8 to prevent accidental displacement under the working condition of shaking.

[0090] The mounting block 2, the connecting plate 6 and the anti-falling plate 7 are covered with a rust-proof coating; the rust-proof coating covers the key components, prolongs the service life of the device in humid and corrosive environments, and reduces failure caused by rust.

[0091] Embodiment 4

[0092] A use method of the anti-falling hook device, comprising the following steps:

[0093] S1, installation preparation:

[0094] Check the surface cleanliness of the hook, make sure there is no oil or rust, to avoid affecting the stability of the mounting block 2. According to the size of the hook, select the appropriate mounting block 2, and then sleeve it on the top end of the hook, and make sure that the anti-collision side plate 201 is symmetrically attached to both sides of the hook neck.

[0095] S2, connect the plate 6 and the mounting block 2: align the positioning groove 603 of the connecting plate 6 with the positioning protrusion 202 of the mounting block 2, and slowly push it in until the positioning hole 204 is completely aligned; insert the fixing pin 3 through the positioning hole 204, and tighten the fixing head 4 to complete the connection.

[0096] S3, anti-dropping plate 7 installation and adjustment: align the sliding groove of the anti-dropping plate 7 with the sliding bar 602 of the connecting plate 6, push it in along a straight line until the end of the anti-dropping plate 7 abuts against the inner wall of the hook mouth, adjust the position of the anti-dropping plate 7 so that the first through slot 604 partially overlaps with the second through slot 703, insert the bolt and tighten it, fix the relative position of the anti-dropping plate 7 and the connecting plate 6, check whether the magnet counterweight at the bottom of the anti-dropping plate 7 is tightly attracted to the magnet layer of the blocking part 8, and if necessary, slightly adjust the angle of the anti-dropping plate, and after completion, loosen the bolt to the point where the anti-dropping plate 7 can move along the surface of the connecting plate 6, and the nut of the bolt uses two nuts with opposite threads.

[0097] S4, anti-dropping function verification:

[0098] Manually pull the anti-dropping plate 7 and slide it to the maximum stroke along the sliding groove, simulate the movement state of the anti-dropping plate 7 during hoisting, ensure that there is no jamming or looseness, hang the test load, and observe whether the anti-dropping plate 7 remains in close abutment with the hook body 1 when the hook is under stress, and whether the magnetic attraction force is sufficient to resist shaking.

[0099] S5, maintenance and replacement: regularly clean the impurities between the sliding groove and the sliding bar, apply lubricating grease to ensure smooth sliding, if the anti-dropping plate 7 is deformed, simply loosen the bolt, pull out the old plate along the sliding groove, replace the new plate and re-fix it without disassembling the entire device.

[0100] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalents of the essential elements of the claims are intended to be embraced therein.

[0101] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature described. The specification can include implicit combinations of explicitly mentioned features and / or explicit combinations of implicitely mentioned features. Each embodiment depends on the explicit combinations of features and / or the implicit combinations of features made specifically within that embodiment, and each such embodiment can be combined with every other such embodiment to create further embodiments.

Claims

1. An anti-disengagement device, characterized in that: Mounting block (2); the mounting block (2) is sleeved with the top of the hook; the mounting block (2) has a positioning protrusion (202) on its surface, and the positioning protrusion (202) has a positioning hole (204) on its lateral surface; A connecting plate (6) is provided with a positioning groove (603) on its surface. A positioning hole (204) is opened on the inner surface of the positioning groove (603). When the positioning protrusion (202) extends into the positioning groove (603), the positioning hole (204) is aligned. The connecting plate (6) is movably connected to the mounting block (2). A first through groove (604) is opened on the side of the connecting plate (6) away from the positioning groove (603). Anti-detachment plate (7) is nested on the outer surface of the connecting plate (6). The surface of the anti-detachment plate (7) is provided with a second through groove (703). When the first through groove (604) and the second through groove (703) partially overlap and align, they are movably connected by bolts. When the end of the anti-detachment plate (7) extends out of the connecting plate (6), the end of the anti-detachment plate (7) abuts against the surface of the hook.

2. The anti-disengagement device according to claim 1, characterized in that: It also includes at least one blocking part (8), which is fixedly installed on the surface of the hook, and the surface of the blocking part (8) is provided with a magnet layer.

3. The anti-disengagement device according to claim 1, characterized in that: The positioning protrusions (202) are symmetrically arranged along the central axis of the connecting plate (6), and the positioning holes (204) are symmetrically distributed along the central axis of the connecting plate (6).

4. The anti-disengagement device according to claim 3, characterized in that: It also includes anti-collision side plates (201), which are fixedly installed on the surface of the mounting block (2) and are symmetrically distributed on both sides of the positioning protrusion (202).

5. The anti-disengagement device according to claim 4, characterized in that: The edge of the anti-collision side plate (201) away from the positioning protrusion (202) is rounded.

6. The anti-disengagement device according to claim 1, characterized in that: The connecting plate (6) is provided with a sliding strip (602) on its lateral surface, and the anti-detachment plate (7) moves linearly along the outer surface of the connecting plate (6).

7. The anti-disengagement device according to claim 6, characterized in that: The anti-detachment plate (7) is C-shaped, and a first limiting block (701) is provided at the edge of the opening of the C-shape, and a second limiting block (702) is provided on the inner surface of the C-shape near the opening.

8. The anti-disengagement device according to claim 7, characterized in that: A groove is formed between the first limiting block (701) and the second limiting block (702). When the anti-detachment plate (7) is connected to the connecting plate (6), the slide bar (602) extends into the groove and moves linearly along the inner surface of the groove.

9. The anti-disengagement device according to claim 8, characterized in that: The bottom of the anti-detachment plate (7) is equipped with a counterweight, which is a magnet.

10. The anti-disengagement device according to claim 1, characterized in that: The mounting block (2), connecting plate (6), and anti-detachment plate (7) are covered with an anti-rust coating.

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