Self-locking device and self-locking equipment

By installing a self-locking device on the shelf and using the linkage mechanism to drive the lifting and lowering of the barrier lever, the problem of frequent use of aluminum alloy baffles is solved, and the safe limit and efficient loading of the transfer box are achieved.

CN222664168UActive Publication Date: 2025-03-25GAC TOYOTA MOTOR
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Patent Information

Application Number
CN202421010816.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-10
Publication Date
2025-03-25
Estimated Expiration
2034-05-10

AI Technical Summary

Technical Problem

In the prior art, frequent use of aluminum alloy baffles during loading can easily lead to fall off, causing safety hazards for the drop of the transport box, and reducing loading efficiency.

Method used

A self-locking device is designed, including a shelf, a mount, a linkage mechanism and a barrier rod. The linkage mechanism drives the lifting and lowering of the barrier lever to achieve limiting and releasing the transfer box, and avoid falling off caused by frequent operations.

Benefits of technology

It effectively avoids the transfer box falling from the shelves, improves loading efficiency, and extends service life.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a self-locking device and self-locking equipment, and relates to the technical field of automobile manufacturing. The self-locking device comprises a goods shelf, a mounting seat, a linkage mechanism and a blocking rod, wherein the goods shelf is used for placing a transfer box; the mounting seat is arranged on the edge of the goods shelf; the linkage mechanism is arranged on the mounting seat; the blocking rod is arranged on the linkage mechanism, and the linkage mechanism is used for driving the blocking rod to move up and down; when the blocking rod ascends, the transfer box is blocked, and when the blocking rod descends, the transfer box is released. According to the technical scheme, operation is convenient, the loading efficiency is improved, meanwhile, the transfer box is limited in a lifting mode, frequent buckling is avoided, and the service life is prolonged.
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Description

Technical Field

[0001] The utility model relates to the technical field of automobile manufacturing, in particular to a self-locking device and a self-locking equipment. Background Art

[0002] At present, in the SPS line operation, the operator is loading the airbag on the SPS line. The SPS line side shelf is used to store the transfer box, and the shelf exit baffle is made of aluminum alloy pipes. During the loading process, the trolley needs to be moved to the edge of the shelf and the transfer box on the shelf needs to be moved onto the trolley.

[0003] However, due to the high frequency of use of the shelves, loading must be done on the shelves every 12 minutes. The durability of the aluminum alloy baffles is not high. Frequent loading can easily cause the fasteners to fall off, and the transfer boxes to fall from the shelves, posing a safety hazard. At the same time, frequent operation of the baffles also reduces loading efficiency. Utility Model Content

[0004] The main purpose of the utility model is to provide a self-locking device and a self-locking equipment, aiming to solve the technical problem in the prior art that the aluminum alloy baffle is easily caused to fall off due to frequent use during the loading process.

[0005] In order to achieve the above object, the utility model provides a self-locking device, which comprises:

[0006] A shelf, wherein the shelf is used to place the transfer box;

[0007] A mounting seat, the mounting seat being arranged at an edge of the shelf;

[0008] A linkage mechanism, wherein the linkage mechanism is arranged on the mounting seat;

[0009] A blocking rod, wherein the blocking rod is arranged on the linkage mechanism, and the linkage mechanism is used to drive the blocking rod to move up and down;

[0010] Wherein, the blocking rod is raised to block the transfer box, and the blocking rod is lowered to allow the transfer box to pass.

[0011] In one embodiment, the linkage mechanism comprises:

[0012] A guide rod, wherein the mounting seat is provided with a guide hole, and the guide rod is inserted into the guide hole;

[0013] An abutment plate, the abutment plate being arranged on one side of the mounting seat and connected to the guide rod;

[0014] A lifting assembly, wherein the lifting assembly is arranged on the other side of the mounting seat, and the blocking rod is arranged on the lifting assembly;

[0015] A guide assembly, one end of which is connected to the lifting assembly, and the other end of which is connected to the abutment plate;

[0016] When the abutment plate moves toward or away from the mounting seat, the lifting assembly is driven to move up and down by the guide assembly.

[0017] In one embodiment, the guide assembly comprises:

[0018] A support seat, the support seat is arranged on the lifting assembly;

[0019] A pulley, wherein the pulley is arranged on the support seat;

[0020] A guide plate, one end of which is connected to the abutment plate, and the other end of which abuts on the pulley;

[0021] An elastic member, wherein the bottom of the elastic member is arranged on the lifting assembly, the side wall of the elastic member is arranged on the mounting seat, and the blocking rod is connected to the elastic member;

[0022] When the abutment plate moves toward the side close to the mounting seat, it drives the guide plate to slide on the pulley, so as to press down the lifting assembly through the guide plate; when the abutment plate moves toward the side away from the mounting seat, it drives the guide plate to slide on the pulley, and the lifting assembly rebounds and rises through the elastic member.

[0023] In one embodiment, the guide plate includes a first guide portion and a second guide portion connected to the first guide portion, and an angle is formed between the first guide portion and the second guide portion;

[0024] One end of the first guide portion is connected to the abutment plate, one end of the second guide portion is connected to the other end of the first guide portion, and the other end of the second guide portion extends to a side away from the mounting seat and abuts against the pulley.

[0025] In one embodiment, the support seat includes two support plates arranged opposite to each other, the bottom of the support plates is connected to the lifting assembly, a connecting shaft is provided between the two support plates, and the pulley is provided on the connecting shaft.

[0026] In one embodiment, the elastic member is a spring.

[0027] In one embodiment, the lifting assembly comprises:

[0028] A connecting plate, the connecting plate being arranged on a side of the mounting seat away from the abutting plate, and the elastic member and the supporting seat being arranged on the connecting plate;

[0029] A limiting member is arranged on the mounting seat, and a limiting hole is provided on the limiting member. One end of the blocking rod is arranged on the connecting plate, and the other end can be raised and lowered and arranged in the limiting hole.

[0030] In one embodiment, the elastic member is disposed in the limiting member, and flanges are provided on the top and bottom of the limiting member, and two ends of the elastic member are respectively in contact with the flanges at two ends of the limiting member.

[0031] In one embodiment, the number of the blocking rods is two, and the two blocking rods are respectively arranged on both sides of the linkage mechanism.

[0032] In addition, in order to solve the above problems, the utility model also proposes a self-locking device, which includes a trolley and the self-locking device as described above, and the trolley is used to abut against the linkage mechanism when approaching the shelf, so that the blocking rod releases the transfer box;

[0033] The trolley is also used for blocking the transfer box when the linkage mechanism drives the blocking rod to rise when the trolley is away from the shelf.

[0034] The technical solution of the utility model limits the transfer box on the shelf through the blocking rod, or allows the transfer box to be transferred from the shelf. During loading, the lifting and lowering of the blocking rod can be achieved by pressing the linkage mechanism. By pressing the linkage mechanism to open the blocking rod, the transfer box slides from the shelf into the trolley. After the loading is completed, the linkage mechanism is released, and the blocking rod rises synchronously, effectively preventing the transfer box from falling from the shelf. The operation is convenient and the loading efficiency is improved. At the same time, the transfer box is limited by the lifting method to avoid frequent buckling and increase the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of the structure of the self-locking device provided by the utility model;

[0037] Figure 2 The present invention is a schematic structural diagram of a linkage mechanism in a self-locking device provided by the present invention.

[0038] Description of Figure Numbers:

[0039]

[0040]

[0041] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0044] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0045] The utility model discloses a self-locking device, which includes a shelf 10, a mounting seat 20, a linkage mechanism 30 and a blocking rod 40, wherein the shelf 10 is used to place a transfer box 50; the mounting seat 20 is arranged at the edge of the shelf 10; the linkage mechanism 30 is arranged on the mounting seat 20; the blocking rod 40 is arranged on the linkage mechanism 30, and the linkage mechanism 30 is used to drive the blocking rod 40 to move up and down; wherein, the blocking rod 40 blocks the transfer box 50 when it rises, and releases the transfer box 50 when it descends.

[0046] In one embodiment, please refer to Figure 1 and Figure 2 The shelf 10 has multiple layers for placing transfer boxes 50. The layers are inclined and have tracks, so that the transfer boxes 50 can automatically slide out of the shelf 10 under the action of gravity, reducing the work intensity of the operators.

[0047] The blocking bar 40 is installed on the layer plate and is located at the end position of the track sliding direction. In the initial state, the part of the blocking bar 40 protrudes from the top of the layer plate to realize that the transfer box 50 slides out of the shelf 10 when not loaded.

[0048] Specifically, a mounting seat 20 can be installed on the layer plate to provide support for the linkage mechanism 30 and the blocking rod 40. The layer plate can be a grid-shaped metal layer plate, so that the blocking rod 40 protrudes from the top of the layer plate through the hollow structure of the grid. It can also be achieved by providing an avoidance groove at the position of the layer plate corresponding to the blocking rod 40.

[0049] When loading is required, the blocking rod 40 is driven down through the linkage mechanism 30 so that the blocking rod 40 is lowered to the bottom of the layer plate, thereby releasing the transfer box 50 and allowing the transfer box 50 to slide out from the shelf 10.

[0050] In one embodiment, in order to further improve the loading efficiency, the linkage mechanism 30 can be installed on the side of the shelf 10. When loading, the trolley is moved to dock with the shelf 10. During the docking process, the linkage mechanism 30 is pressed by the trolley, so that the linkage mechanism 30 drives the blocking rod 40 to rise and fall.

[0051] In one embodiment, a bridge may be further provided on the trolley, one end of which may be rotatably set on the edge of the trolley, and the other end of the bridge is provided with a hook. When loading, the hook of the bridge is overlapped on the shelf 10, thereby maintaining the relative fixity between the trolley and the shelf 10 and preventing the transfer box 50 from falling during the loading process.

[0052] The technical solution of the utility model limits the transfer box 50 on the shelf 10 through the blocking rod 40, or allows the transfer box 50 to be transferred from the shelf 10. During loading, the lifting and lowering of the blocking rod 40 can be achieved by pressing the pressing linkage mechanism 30. By pressing the linkage mechanism 30 to open the blocking rod 40, the transfer box 50 slides from the shelf 10 into the trolley. After the loading is completed, the linkage mechanism 30 is released, and the blocking rod 40 rises synchronously, effectively preventing the transfer box 50 from falling from the shelf 10. The operation is convenient, the loading efficiency is improved, and the transfer box 50 is limited by the lifting method, which avoids frequent buckling and improves the service life.

[0053] In one embodiment, the linkage mechanism 30 includes a guide rod 31, an abutment plate 32, a lifting assembly 34, and a guide assembly 33. The mounting seat 20 is provided with a guide hole, and the guide rod 31 is inserted into the guide hole; the abutment plate 32 is arranged on one side of the mounting seat 20, and the abutment plate 32 is connected to the guide rod 31; the lifting assembly 34 is arranged on the other side of the mounting seat 20, and the blocking rod 40 is arranged on the lifting assembly 34; one end of the guide assembly 33 is connected to the lifting assembly 34, and the other end is connected to the abutment plate 32; wherein, when the abutment plate 32 moves toward or away from the mounting seat 20, the lifting assembly 34 is driven to move up and down through the guide assembly 33.

[0054] The abutment plate 32 protrudes from the side wall of the shelf 10 and is used to abut against the trolley. When the abutment plate 32 contacts the trolley, the trolley presses the abutment plate 32 to move toward one side of the shelf 10, and the guide rod 31 moves in the guide hole to prevent the abutment plate 32 from shifting.

[0055] The contact plate 32 drives the guide assembly 33 to move synchronously during the movement, and the guide assembly 33 drives the lifting assembly 34 to move upward and downward during the movement, and the blocking rod 40 moves upward and downward synchronously with the lifting assembly 34 .

[0056] For details, please refer to Figure 2 The guide assembly 33 includes a support seat 331, a pulley 333, a guide plate 332, and an elastic member, wherein the support seat 331 is arranged on the lifting assembly 34; the pulley 333 is arranged on the support seat 331; one end of the guide plate 332 is connected to the abutment plate 32, and the other end abuts on the pulley 333; the bottom of the elastic member is arranged on the lifting assembly 34, the side wall of the elastic member is arranged on the mounting seat 20, and the blocking rod 40 is connected to the elastic member; when the abutment plate 32 moves toward the side close to the mounting seat 20, it drives the guide plate 332 to slide on the pulley 333 to press down the lifting assembly 34 through the guide plate 332; when the abutment plate 32 moves toward the side away from the mounting seat 20, it drives the guide plate 332 to slide on the pulley 333, and the lifting assembly 34 rebounds and rises through the elastic member.

[0057] The lifting assembly 34 includes a connecting plate 341 and a limiting member 342. The connecting plate 341 is arranged on the side of the mounting seat 20 away from the abutment plate 32, and the elastic member and the support seat 331 are both arranged on the connecting plate 341; the limiting member 342 is arranged on the mounting seat 20, and a limiting hole is provided on the limiting member 342. One end of the blocking rod 40 is arranged on the connecting plate 341, and the other end can be raised and lowered and arranged in the limiting hole.

[0058] The side wall of the stopper 342 is fixed to the mounting seat 20 by screws, and the connecting plate 341 is lifted and lowered under the action of the guide assembly 33, and drives the blocking rod 40 to move in the stopper 342 during the lifting and lowering process, thereby preventing the blocking rod 40 from being offset. At the same time, the connection stability of the blocking rod 40 is improved, and the impact of the transfer box 50 on the blocking rod 40 is reduced.

[0059] In order to save installation space, the elastic member is installed in the limiter 342. The top and bottom of the limiter 342 are both provided with flanges, and the elastic member can be a spring, and the two ends of the elastic member are respectively in contact with the flanges at the two ends of the limiter 342.

[0060] In the initial state, any part of the blocking rod 40 located in the limiting member 342 is connected to any position of the elastic member. When the connecting plate 341 is raised or lowered, the blocking rod 40 is driven to be raised or lowered synchronously.

[0061] For details, please refer to Figure 2 The guide plate 332 includes a first guide portion 3322 and a second guide portion 3322 connected to the first guide portion 3321, and an angle is formed between the first guide portion 3321 and the second guide portion 3322; one end of the first guide portion 3321 is connected to the abutment plate 32, one end of the second guide portion 3322 is connected to the other end of the first guide portion 3321, and the other end of the second guide portion 3322 extends to a side away from the mounting seat 20 and abuts against the pulley 333.

[0062] When the contact plate 32 moves toward the side of the shelf 10, the second guide portion 3322 moves toward the side of the shelf 10. As the second guide portion 3322 approaches the side of the shelf 10, the second guide portion 3322 is tilted, and the contact position with the pulley 333 is gradually lowered, thereby generating downward pressure on the pulley 333 and the support seat 331. When the pressure is greater than the elastic force of the elastic member, the connecting plate 341 and the blocking rod 40 are pressed downward, thereby achieving the descent of the blocking rod 40.

[0063] When the contact plate 32 moves away from the shelf 10 , the contact position between the second guide portion 3322 and the pulley 333 rises, and under the action of the spring, the connecting plate 341 is reset with the blocking rod 40 , thereby achieving the rise of the blocking rod 40 .

[0064] It should be noted that the angle between the first guide portion 3321 and the second guide portion 3322 can be adjusted, wherein the larger the angle, the faster the blocking rod 40 descends, and the blocking rod 40 is triggered more sensitively when the trolley is docked with the shelf 10. On the contrary, the triggering speed is slower, and the angle can be adjusted according to the on-site production needs, which is not limited here.

[0065] In one embodiment, the support seat 331 includes two oppositely arranged support plates 3311 , the bottom of the support plates 3311 is connected to the lifting assembly 34 , a connecting shaft 3312 is provided between the two support plates 3311 , and the pulley 333 is provided on the connecting shaft 3312 .

[0066] The pulley 333 can rotate on the connecting shaft 3312, thereby reducing the friction between the pulley 333 and the guide plate 332, preventing the guide plate 332 from getting stuck during the movement, and improving the stability of the overall structure during operation.

[0067] In one embodiment, the number of the blocking rods 40 is two, and the two blocking rods 40 are respectively arranged on the linkage mechanism 30. By arranging a blocking rod 40 on each of the left and right sides, the abutting plate 32 and the connecting plate 341 are positioned in the horizontal and vertical directions to avoid position deviation and improve reliability.

[0068] Furthermore, in order to solve the above-mentioned problem, the utility model also proposes a self-locking device, which includes a trolley and the self-locking device as mentioned above, and the trolley is used to abut against the linkage mechanism when approaching the shelf 10 so that the blocking rod 40 releases the transfer box 50; the trolley is also used to move away from the shelf, and the linkage mechanism 30 drives the blocking rod 40 to rise to block the transfer box 50.

[0069] In one embodiment, please refer to Figure 1 and Figure 2 The shelf 10 has multiple layers for placing transfer boxes 50. The layers are inclined and have tracks, so that the transfer boxes 50 can automatically slide out of the shelf 10 under the action of gravity, reducing the work intensity of the operators.

[0070] The blocking bar 40 is installed on the layer plate and is located at the end position of the track sliding direction. In the initial state, the part of the blocking bar 40 protrudes from the top of the layer plate to realize that the transfer box 50 slides out of the shelf 10 when not loaded.

[0071] Specifically, a mounting seat 20 can be installed on the layer plate to provide support for the linkage mechanism 30 and the blocking rod 40. The layer plate can be a grid-shaped metal layer plate, so that the blocking rod 40 protrudes from the top of the layer plate through the hollow structure of the grid. It can also be achieved by providing an avoidance groove at the position of the layer plate corresponding to the blocking rod 40.

[0072] When loading is required, the blocking rod 40 is driven down through the linkage mechanism 30 so that the blocking rod 40 is lowered to the bottom of the layer plate, thereby releasing the transfer box 50 and allowing the transfer box 50 to slide out from the shelf 10.

[0073] In one embodiment, in order to further improve the loading efficiency, the linkage mechanism 30 can be installed on the side of the shelf 10. When loading, the trolley is moved to dock with the shelf 10. During the docking process, the linkage mechanism 30 is pressed by the trolley, so that the linkage mechanism 30 drives the blocking rod 40 to rise and fall.

[0074] In one embodiment, a bridge may be further provided on the trolley, one end of which may be rotatably set on the edge of the trolley, and the other end of the bridge is provided with a hook. When loading, the hook of the bridge is overlapped on the shelf 10, thereby maintaining the relative fixity between the trolley and the shelf 10 and preventing the transfer box 50 from falling during the loading process.

[0075] The technical solution of the utility model limits the transfer box 50 on the shelf 10 through the blocking rod 40, or allows the transfer box 50 to be transferred from the shelf 10. During loading, the lifting and lowering of the blocking rod 40 can be achieved by pressing the pressing linkage mechanism 30. By pressing the linkage mechanism 30 to open the blocking rod 40, the transfer box 50 slides from the shelf 10 into the trolley. After the loading is completed, the linkage mechanism 30 is released, and the blocking rod 40 rises synchronously, effectively preventing the transfer box 50 from falling from the shelf 10. The operation is convenient, the loading efficiency is improved, and the transfer box 50 is limited by the lifting method, which avoids frequent buckling and improves the service life.

[0076] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A self-locking device, characterized in that: The self-locking device comprises: A shelf, wherein the shelf is used to place the transfer box; A mounting seat, the mounting seat being arranged at an edge of the shelf; A linkage mechanism, wherein the linkage mechanism is arranged on the mounting seat; A blocking rod, wherein the blocking rod is arranged on the linkage mechanism, and the linkage mechanism is used to drive the blocking rod to move up and down; Wherein, the blocking rod is raised to block the transfer box, and the blocking rod is lowered to allow the transfer box to pass.

2. The self-locking device according to claim 1, characterized in that: The linkage mechanism comprises: A guide rod, wherein the mounting seat is provided with a guide hole, and the guide rod is inserted into the guide hole; An abutment plate, the abutment plate being arranged on one side of the mounting seat and connected to the guide rod; A lifting assembly, wherein the lifting assembly is arranged on the other side of the mounting seat, and the blocking rod is arranged on the lifting assembly; A guide assembly, one end of which is connected to the lifting assembly, and the other end of which is connected to the abutment plate; When the abutment plate moves toward or away from the mounting seat, the lifting assembly is driven to move up and down by the guide assembly.

3. The self-locking device according to claim 2, characterized in that: The guide assembly comprises: A support seat, the support seat is arranged on the lifting assembly; A pulley, wherein the pulley is arranged on the support seat; A guide plate, one end of which is connected to the abutment plate, and the other end of which abuts on the pulley; An elastic member, wherein the bottom of the elastic member is arranged on the lifting assembly, the side wall of the elastic member is arranged on the mounting seat, and the blocking rod is connected to the elastic member; When the abutment plate moves toward the side close to the mounting seat, it drives the guide plate to slide on the pulley, so as to press down the lifting assembly through the guide plate; when the abutment plate moves toward the side away from the mounting seat, it drives the guide plate to slide on the pulley, and the lifting assembly rebounds and rises through the elastic member.

4. The self-locking device according to claim 3, characterized in that: The guide plate includes a first guide portion and a second guide portion connected to the first guide portion, and an angle is formed between the first guide portion and the second guide portion; One end of the first guide portion is connected to the abutment plate, one end of the second guide portion is connected to the other end of the first guide portion, and the other end of the second guide portion extends to a side away from the mounting seat and abuts against the pulley.

5. The self-locking device according to claim 3, characterized in that: The support seat comprises two support plates arranged opposite to each other, the bottom of the support plates is connected to the lifting assembly, a connecting shaft is provided between the two support plates, and the pulley is arranged on the connecting shaft.

6. The self-locking device according to claim 3, characterized in that: The elastic member is a spring.

7. The self-locking device according to claim 3, characterized in that: The lifting assembly comprises: A connecting plate, the connecting plate being arranged on a side of the mounting seat away from the abutting plate, and the elastic member and the supporting seat being arranged on the connecting plate; A limiting member is arranged on the mounting seat, and a limiting hole is provided on the limiting member. One end of the blocking rod is arranged on the connecting plate, and the other end can be raised and lowered and arranged in the limiting hole.

8. The self-locking device according to claim 7, characterized in that: The elastic member is arranged in the limiting member, and flanges are provided on the top and the bottom of the limiting member, and two ends of the elastic member are respectively in contact with the flanges at two ends of the limiting member.

9. The self-locking device according to claim 1, characterized in that: The number of the blocking rods is two, and the two blocking rods are respectively arranged on the sides of the linkage mechanism.

10. A self-locking device, characterized in that: The self-locking device comprises a trolley and a self-locking device as claimed in any one of claims 1 to 9, wherein the trolley is used to abut against the linkage mechanism when approaching the shelf so that the blocking rod releases the transfer box; The trolley is also used for blocking the transfer box when the linkage mechanism drives the blocking rod to rise when the trolley is away from the shelf.