Intelligent warehousing system and material carrying equipment based on robot automation

Abstract

The invention relates to the technical field of robot warehousing and carrying, in particular to an intelligent warehousing system and material carrying equipment based on robot automation, which comprises a robot main body, a bearing mechanism is arranged above the robot main body, and a support frame is mounted above the robot main body through a moving mechanism; two sets of supporting plates are installed on one side of the supporting frame in a sliding mode through a driving mechanism, two sets of clamps are arranged between the two sets of supporting plates, protrusions are fixedly installed on the adjacent sides of the two sets of clamps, limiting blocks are installed above the clamps in a sliding mode, and the clamps are connected with the supporting plates through lifting mechanisms. According to the intelligent warehousing system based on robot automation and the material carrying equipment, under the cooperation of the clamp and the limiting block, the periphery of a material can be limited, the stability of the material in the carrying process is improved, the center position of the material can be determined, and the robot body can move to the bottom of the material.

Description

Technical Field

[0001] The present invention relates to the technical field of robot warehousing and handling, and specifically to an intelligent warehousing system and material handling equipment based on robot automation. Background Technique

[0002] A robot is an automated machine with some intelligent capabilities similar to those of humans or living beings, such as perception ability, planning ability, motion ability, and cooperation ability. The diversity, wide application, and great potential for future development of robots. With the continuous progress of technology, robots will play an important role in more fields. When robots are used for warehousing and handling, generally, they handle materials with sufficient space between the bottom and the ground for the robot to enter. For materials with a small space between the bottom and the ground or materials that are in contact with the ground at the bottom, manual labor is required to move the materials onto the robot, which affects the handling efficiency and increases the workload of the staff. Or, a handling tool is inserted into the bottom of the material from the side, and then the material is lifted and handled. During this process, the material is prone to tilting, posing certain safety hazards. Summary of the Invention

[0003] The purpose of the present invention is to provide an intelligent warehousing system and material handling equipment based on robot automation to solve the problems raised in the above background technique.

[0004] To achieve the above purpose, the present invention provides the following technical solution: An intelligent warehousing system and material handling equipment based on robot automation, including a robot main body. Above the robot main body, a supporting mechanism is provided. Above the robot main body, a support frame is installed through a moving mechanism. On one side of the support frame, two groups of support plates are slidably installed through a driving mechanism. Between the two groups of support plates, two groups of clamps are provided. On the adjacent sides of the two groups of clamps, protrusions are fixedly installed. Above the clamps, a limiting block is slidably installed. The clamps are connected to the support plates through a lifting mechanism.

[0005] Preferably, the supporting mechanism includes a load-bearing plate and an electric push rod. The electric push rod is fixedly installed above the robot main body. The electric push rod is vertically arranged, and the output end of the electric push rod is fixedly connected to the load-bearing plate.

[0006] Preferably, the moving mechanism includes cross beams. The number of cross beams is two groups. Both groups of cross beams are located between the two groups of support plates. The cross beams are parallel to the support plates. The cross beams are fixedly connected to the robot main body. Above the cross beams, installation grooves are provided. The installation grooves are slidably connected to the support frame. Above the cross beams, a power assembly is provided.

[0007] Preferably, the power assembly includes a rotatable gear, the gear is rotatably installed inside the support frame through a rotating structure, a rack is arranged above the cross beam through an adjusting structure, and the gear meshes with the rack.

[0008] Preferably, the rotating structure includes a threaded rod and a motor. The threaded rod is rotatably inserted inside the support frame. The threaded rod is horizontally arranged, and the axial direction of the threaded rod is perpendicular to the length direction of the cross beam. The threaded rod is fixedly connected to the gear. The motor is fixedly installed on the side of the support frame, and the output end of the motor is fixedly connected to one end of the threaded rod.

[0009] Preferably, the adjusting structure includes a groove body and an elastic sheet. The groove body is opened above the cross beam. The groove body is slidably connected to the rack. The elastic sheet is installed inside the groove body, and the elastic sheet is fixedly connected to the rack.

[0010] Preferably, the driving mechanism includes a threaded block. The threaded block is slidably inserted inside the support frame. The threaded block is threadedly connected to the threaded rod. The threaded block is fixedly connected to the support plate. The threaded block is connected to the rack through a pushing structure.

[0011] Preferably, the pushing structure includes a groove. The groove is opened inside the support frame. An adjusting member is slidably inserted inside the groove through an elastic member. The adjusting member is in contact and cooperation with the rack. One end face of the adjusting member close to the rack is inclined. A first magnet is fixedly installed at one end of the adjusting member away from the rack. A second magnet is fixedly installed on one side of the threaded block close to the adjusting member. The first magnet and the second magnet attract each other.

[0012] Preferably, the lifting mechanism includes a pushing member, a mounting plate and a sleeve. The sleeve is slidably sleeved on one side of the mounting plate close to the support plate. The sleeve is fixedly connected to the support plate. One end of the pushing member is rotatably connected to one end of the mounting plate away from the sleeve. The other end of the pushing member is rotatably connected to the fixture. The lifting mechanism further includes a supporting structure.

[0013] Preferably, the supporting structure includes a cross plate. Two groups of push plates are rotatably installed on one side of the cross plate close to the fixture. One end of the push plate away from the cross plate is rotatably installed with a slider. The slider is fixedly connected to the limiting block. A chute is opened inside the fixture. A rod is fixedly inserted inside the chute. The rod is slidably connected to the slider. A first spring is movably sleeved on the outside of the rod. The first spring is fixedly connected to the two groups of sliders. A guide groove is opened on one side of the cross plate away from the push plate. A guide block is slidably inserted inside the guide groove. A cross bar is fixedly installed on one side of the guide block close to the support plate. The cross bar is slidably connected to the support plate. A second spring is movably sleeved on the outside of the cross bar. The second spring is located between the guide block and the support plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the fixture, with the cooperation of the limit block, it is possible to limit the four sides of the material, increase the stability of the material during handling, and determine the central position of the material, so that when the robot body moves to the bottom of the material, it is no longer necessary to confirm the central position of the material, making the load more evenly distributed during handling and facilitating the improvement of handling efficiency.

[0015] 2. By setting the fixture, with the cooperation of the lifting mechanism, it is possible to lift the material to a certain extent, enabling the robot body to move to the bottom of the material for handling, making the device more widely applicable.

[0016] 3. By setting the fixture, with the cooperation of the limit block, it is possible to adjust the position of the support plate, so that when the fixture moves upward, the force received by the material is at the central position of the side of the material, and when the material is lifted, the material is not prone to tilting, which is beneficial to improving the safety of handling the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure from another perspective of the present invention; Figure 3 is of the present invention Figure 2 an enlarged view of part A; Figure 4 is a sectional view of the structure of the present invention; Figure 5 is a schematic diagram of a part of the structure of the present invention; Figure 6 is a sectional view of a part of the structure of the present invention; Figure 7 is a sectional view of a local structure of the present invention; Figure 8 is of the present invention Figure 7 a sectional view of a part of the structure.

[0018] In the accompanying drawings, the list of components represented by each reference numeral is as follows: 1. Robot body; 2. Load-bearing plate; 3. Electric push rod; 4. Fixture; 5. Protrusion; 6. Limit block; 7. Slide groove; 8. Slide block; 9. Rod member; 10. First spring; 11. Cross plate; 12. Push plate; 13. Support plate; 14. Cross bar; 15. Second spring; 16. Pushing member; 17. Mounting plate; 18. Sleeve; 19. Guide groove; 20. Guide block; 21. Support frame; 22. Threaded block; 23. Threaded rod; 24. Motor; 25. Gear; 26. Rack; 27. Groove; 28. Adjusting member; 29. Elastic member; 30. First magnet; 31. Second magnet; 32. Cross beam; 33. Mounting groove; 34. Groove body; 35. Elastic sheet. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-8 , in the figure, an intelligent warehousing system and a material handling device based on robot automation, including a robot body 1, a supporting mechanism is arranged above the robot body 1, a support frame 21 is installed above the robot body 1 through a moving mechanism, two groups of support plates 13 are slidably installed on one side of the support frame 21 through a driving mechanism, two groups of fixtures 4 are arranged between the two groups of support plates 13, protrusions 5 are fixedly installed on adjacent sides of the two groups of fixtures 4, a limit block 6 is slidably installed above the fixture 4, and the fixture 4 is connected to the support plate 13 through a lifting mechanism.

[0021] The supporting mechanism includes a load-bearing plate 2 and an electric push rod 3. The electric push rod 3 is fixedly installed above the robot body 1. The electric push rod 3 is arranged vertically, and the output end of the electric push rod 3 is fixedly connected to the load-bearing plate 2.

[0022] In the initial state, the fixture 4 is located above the robot body 1. The robot body 1 moves to the side of the material to be carried. The moving mechanism drives the support frame 21 to move above the robot body 1, driving the fixture 4 to move synchronously, so that the two sets of fixtures 4 can move to both sides of the material. The two sets of fixtures 4 clamp the material from both sides. The limit block 6 can further clamp the material and can determine the center of gravity position of the material. Under the action of the lifting mechanism, the fixture 4 can drive the material to move upward. The robot body 1 can move to the lower part of the material. The electric push rod 3 is connected to an external power supply. The electric push rod 3 drives the bearing plate 2 to move up and down. The bearing plate 2 moves upward to contact the bottom of the material, so that the robot body 1 can support the material from below, facilitating the handling of the material.

[0023] The moving mechanism includes cross beams 32. The number of cross beams 32 is two. The two cross beams 32 are both located between the two support plates 13. The cross beams 32 are parallel to the support plates 13. The cross beams 32 are fixedly connected to the robot body 1. An installation groove 33 is formed above the cross beam 32. The installation groove 33 is slidably connected to the support frame 21. A power component is arranged above the cross beam 32.

[0024] The power component includes a rotatable gear 25. The gear 25 is rotatably installed inside the support frame 21 through a rotating structure. A rack 26 is arranged above the cross beam 32 through an adjusting structure. The gear 25 meshes with the rack 26.

[0025] The rotating structure includes a threaded rod 23 and a motor 24. The threaded rod 23 is rotatably inserted inside the support frame 21. The threaded rod 23 is horizontally arranged. The axial direction of the threaded rod 23 is perpendicular to the length direction of the cross beam 32. The threaded rod 23 is fixedly connected to the gear 25. The motor 24 is fixedly installed on the side of the support frame 21. The output end of the motor 24 is fixedly connected to one end of the threaded rod 23.

[0026] Specifically, connect the motor 24 to an external power supply. Under the action of the support frame 21, the motor 24 drives the threaded rod 23 to rotate, thereby driving the gear 25 to rotate. Since the gear 25 meshes with the rack 26, when the gear 25 rotates, it can drive the rack 26 to move. The rack 26 drives the robot body 1 to move synchronously through the cross beam 32. At this time, the installation groove 33 is slidably connected to the support frame 21.

[0027] The adjusting structure includes a groove body 34 and a spring piece 35. The groove body 34 is formed above the cross beam 32. The groove body 34 is slidably connected to the rack 26. The spring piece 35 is installed inside the groove body 34. The spring piece 35 is fixedly connected to the rack 26.

[0028] The driving mechanism includes a threaded block 22, which is slidably inserted inside the support frame 21. The threaded block 22 is threadedly connected to the threaded rod 23. The threaded block 22 is fixedly connected to the support plate 13. The threaded block 22 is connected to the rack 26 through a pushing structure.

[0029] The pushing structure includes a groove 27, which is opened inside the support frame 21. An adjusting member 28 is slidably inserted inside the groove 27 through an elastic member 29. The adjusting member 28 is in contact and cooperation with the rack 26. One end face of the adjusting member 28 close to the rack 26 is inclined. A first magnet 30 is fixedly installed at one end of the adjusting member 28 away from the rack 26. A second magnet 31 is fixedly installed on the side of the threaded block 22 close to the adjusting member 28. The first magnet 30 and the second magnet 31 attract each other.

[0030] Specifically, the threaded rod 23 is threadedly connected to the threaded block 22. When the threaded rod 23 rotates, it can drive the threaded block 22 to move inside the support frame 21. In the initial state, the adjusting member 28 is in contact with the rack 26, so that the rack 26 is not engaged with the gear 25. The threaded rod 23 drives the two threaded blocks 22 to approach each other. When the threaded block 22 moves to a certain extent, the threaded block 22 is no longer threadedly connected to the threaded rod 23, and the threaded block 22 stops moving. At this time, the first magnet 30 and the second magnet 31 attract each other. The second magnet 31 can drive the adjusting member 28 to move inside the groove 27 through the first magnet 30. At this time, the elastic member 29 is deformed by force. The adjusting member 28 is no longer in contact with the rack 26. Under the action of the elastic piece 35, the elastic piece 35 pushes the rack 26 to move inside the groove body 34 towards the gear 25, so that the gear 25 and the rack 26 are engaged, and thus the gear 25 can drive the rack 26 to move.

[0031] The lifting mechanism includes a pushing member 16, a mounting plate 17 and a sleeve 18. The sleeve 18 is slidably sleeved on the side of the mounting plate 17 close to the support plate 13. The sleeve 18 is fixedly connected to the support plate 13. One end of the pushing member 16 is rotatably connected to the end of the mounting plate 17 away from the sleeve 18. The other end of the pushing member 16 is rotatably connected to the clamp 4. The lifting mechanism also includes a support structure.

[0032] The support structure includes a cross plate 11. On one side of the cross plate 11 close to the fixture 4, two groups of push plates 12 are rotatably installed. At one end of the push plate 12 away from the cross plate 11, a slider 8 is rotatably installed. The slider 8 is fixedly connected to the limit block 6. A chute 7 is opened inside the fixture 4. A rod 9 is fixedly inserted inside the chute 7. The rod 9 is slidably connected to the slider 8. A first spring 10 is movably sleeved outside the rod 9. The first spring 10 is fixedly connected to the two groups of sliders 8. A guide groove 19 is opened on the side of the cross plate 11 away from the push plate 12. A guide block 20 is slidably inserted inside the guide groove 19. On the side of the guide block 20 close to the support plate 13, a cross bar 14 is fixedly installed. The cross bar 14 is slidably connected to the support plate 13. A second spring 15 is movably sleeved outside the cross bar 14. The second spring 15 is located between the guide block 20 and the support plate 13.

[0033] Specifically, when the two groups of support plates 13 approach each other, they can drive the fixture 4 to move synchronously. The fixture 4 contacts both sides of the material. Under the action of the protrusion 5, the friction between the fixture 4 and the material can be increased. After the fixture 4 stops moving, the support plate 13 drives the cross plate 11 to move towards the fixture 4. Under the action of the push plate 12, the push plate 12 can drive the two groups of limit blocks 6 to approach each other through the slider 8. At this time, the slider 8 slides inside the chute 7. Under the action of the rod 9, the first spring 10 is compressed by force. When one of the limit blocks 6 contacts the material and the other limit block 6 does not contact the material, under the mutual cooperation of the cross plate 11 and the push plate 12, the two groups of limit blocks 6 can drive the cross plate 11 to move along the length direction of the rod 9, so as to confirm the center point of the material.

[0034] When the two groups of limit blocks 6 stop moving, the support plate 13 continues to move towards the fixture 4. The support plate 13 slides outside the cross bar 14, and the second spring 15 deforms under force. The support plate 13 drives the sleeve 18 to move synchronously. When the sleeve 18 moves to a certain position outside the mounting plate 17, the sleeve 18 drives the mounting plate 17 to move synchronously. The mounting plate 17 drives the pushing member 16 to rotate. When the pushing member 16 rotates, it can drive the fixture 4 to move upward, so as to lift the material. At the same time, the fixture 4 drives the cross plate 11 to move upward synchronously, so that the guide block 20 can slide inside the guide groove 19.

[0035] Working principle: Connect the motor 24 to an external power supply. Under the action of the support frame 21, the motor 24 drives the threaded rod 23 to rotate. The threaded rod 23 is threadedly connected to the threaded block 22. When the threaded rod 23 rotates, it can drive the threaded block 22 to move inside the support frame 21. The threaded block 22 drives the support plate 13 to move.

[0036] When the two sets of support plates 13 move closer to each other, they can drive the fixture 4 to move synchronously. The fixture 4 contacts both sides of the material. Under the action of the protrusion 5, the friction between the fixture 4 and the material can be increased. After the fixture 4 stops moving, the support plate 13 drives the cross plate 11 to move towards the fixture 4. Under the action of the push plate 12, the push plate 12 can drive the two sets of limit blocks 6 to move closer to each other through the slider 8. At this time, the slider 8 slides inside the chute 7. Under the action of the rod 9, the first spring 10 is compressed. When one set of limit blocks 6 contacts the material and the other set of limit blocks 6 does not contact the material, under the mutual cooperation of the cross plate 11 and the push plate 12, the two sets of limit blocks 6 can drive the cross plate 11 to move along the length direction of the rod 9, so as to confirm the center point of the material.

[0037] When the two sets of limit blocks 6 stop moving, the support plate 13 continues to move towards the fixture 4. The support plate 13 slides outside the cross bar 14, and the second spring 15 deforms under force. The support plate 13 drives the sleeve 18 to move synchronously. When the sleeve 18 moves to a certain position outside the mounting plate 17, the sleeve 18 drives the mounting plate 17 to move synchronously. The mounting plate 17 drives the pushing member 16 to rotate. When the pushing member 16 rotates, it can drive the fixture 4 to move upward, so as to lift the material. At the same time, the fixture 4 drives the cross plate 11 to move upward synchronously, so that the guide block 20 can slide inside the guide groove 19.

[0038] In the initial state, the adjusting member 28 contacts the rack 26, so that the rack 26 does not mesh with the gear 25. The threaded rod 23 drives the two sets of threaded blocks 22 to move closer to each other. When the threaded blocks 22 move to a certain extent, the threaded blocks 22 are no longer threadedly connected to the threaded rod 23, and the threaded blocks 22 stop moving. At this time, the first magnet 30 and the second magnet 31 attract each other. The second magnet 31 can drive the adjusting member 28 to move inside the groove 27 through the first magnet 30. At this time, the elastic member 29 deforms under force. The adjusting member 28 does not contact the rack 26. Under the action of the elastic piece 35, the elastic piece 35 pushes the rack 26 to move towards the gear 25 inside the groove body 34, so that the gear 25 and the rack 26 mesh, and thus the gear 25 can drive the rack 26 to move. The rack 26 drives the robot main body 1 to move synchronously through the cross beam 32. At this time, the installation groove 33 is slidably connected to the support frame 21.

[0039] The robot main body 1 can move to the lower part of the material. The electric push rod 3 is connected to an external power supply. The electric push rod 3 drives the bearing plate 2 to move up and down. The bearing plate 2 moves upward to contact the bottom of the material, so that the robot main body 1 can support the material from below, which is convenient for handling the material.

[0040] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0041] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent warehousing system and material handling equipment based on robot automation, including a robot main body (1), characterized in that: Above the robot main body (1), a supporting mechanism is provided. Above the robot main body (1), a support frame (21) is installed through a moving mechanism. On one side of the support frame (21), two sets of support plates (13) are slidably installed through a driving mechanism. Between the two sets of support plates (13), two sets of clamps (4) are provided. On the adjacent sides of the two sets of clamps (4), protrusions (5) are fixedly installed. Above the clamps (4), a limiting block (6) is slidably installed. The clamps (4) are connected to the support plates (13) through a lifting mechanism.

2. The intelligent warehousing system and material handling equipment based on robot automation according to claim 1, wherein: The supporting mechanism includes a load-bearing plate (2) and an electric push rod (3). The electric push rod (3) is fixedly installed above the robot main body (1). The electric push rod (3) is arranged vertically, and the output end of the electric push rod (3) is fixedly connected to the load-bearing plate (2).

3. The intelligent warehousing system and material handling equipment based on robot automation according to claim 1, characterized in that: The moving mechanism includes cross beams (32). The number of the cross beams (32) is two. Both of the two cross beams (32) are located between the two sets of support plates (13). The cross beams (32) are parallel to the support plates (13). The cross beams (32) are fixedly connected to the robot main body (1). An installation groove (33) is opened above the cross beams (32). The installation groove (33) is slidably connected to the support frame (21). A power assembly is arranged above the cross beams (32).

4. The intelligent warehousing system and material handling equipment based on robot automation according to claim 3, characterized in that: The power assembly includes a rotatable gear (25). The gear (25) is rotatably installed inside the support frame (21) through a rotating structure. Above the cross beams (32), a rack (26) is arranged through an adjusting structure. The gear (25) meshes with the rack (26).

5. The intelligent warehousing system and material handling equipment based on robot automation according to claim 4, characterized in that: The rotating structure includes a threaded rod (23) and a motor (24). The threaded rod (23) is rotatably inserted into the support frame (21). The threaded rod (23) is horizontally arranged. The axial direction of the threaded rod (23) is perpendicular to the length direction of the cross beams (32). The threaded rod (23) is fixedly connected to the gear (25). The motor (24) is fixedly installed on the side of the support frame (21). The output end of the motor (24) is fixedly connected to one end of the threaded rod (23).

6. The intelligent warehousing system and material handling equipment based on robot automation according to claim 4, wherein: The adjusting structure includes a groove body (34) and an elastic sheet (35). The groove body (34) is opened above the cross beams (32). The groove body (34) is slidably connected to the rack (26) through the elastic sheet (35). The elastic sheet (35) is installed inside the groove body (34). The elastic sheet (35) is fixedly connected to the rack (26).

7. The intelligent warehousing system and material handling equipment based on robot automation according to claim 5, characterized in that: The driving mechanism includes a threaded block (22). The threaded block (22) is slidably inserted into the support frame (21). The threaded block (22) is threadedly connected to the threaded rod (23). The threaded block (22) is fixedly connected to the support plate (13). The threaded block (22) is connected to the rack (26) through a pushing structure.

8. The intelligent warehousing system and material handling equipment based on robot automation according to claim 7, characterized in that: The pushing structure includes a groove (27) which is opened inside the support frame (21). An adjusting member (28) is slidably inserted into the groove (27) through an elastic member (29). The adjusting member (28) is in contact and cooperation with the rack (26). One end face of the adjusting member (28) close to the rack (26) is inclined. A first magnet (30) is fixedly installed at one end of the adjusting member (28) away from the rack (26). A second magnet (31) is fixedly installed on one side of the threaded block (22) close to the adjusting member (28). The first magnet (30) and the second magnet (31) attract each other.

9. The intelligent warehousing system and material handling equipment based on robot automation according to claim 1, wherein: The lifting mechanism includes a pushing member (16), a mounting plate (17) and a sleeve (18). The sleeve (18) is slidably sleeved on one side of the mounting plate (17) close to the support plate (13). The sleeve (18) is fixedly connected to the support plate (13). One end of the pushing member (16) is rotatably connected to the end of the mounting plate (17) away from the sleeve (18). The other end of the pushing member (16) is rotatably connected to the fixture (4). The lifting mechanism further includes a support structure.

10. The intelligent warehousing system and material handling equipment based on robot automation according to claim 9, characterized in that: The support structure includes a cross plate (11). Two groups of push plates (12) are rotatably installed on one side of the cross plate (11) close to the fixture (4). A slider (8) is rotatably installed at one end of the push plate (12) away from the cross plate (11). The slider (8) is fixedly connected to the limit block (6). A chute (7) is opened inside the fixture (4). A rod member (9) is fixedly inserted into the chute (7). The rod member (9) is slidably connected to the slider (8). A first spring (10) is movably sleeved on the outer portion of the rod member (9). The first spring (10) is fixedly connected to the two groups of sliders (8). A guide groove (19) is opened on one side of the cross plate (11) away from the push plates (12). A guide block (20) is slidably inserted into the guide groove (19). A cross bar (14) is fixedly installed on one side of the guide block (20) close to the support plate (13). The cross bar (14) is slidably connected to the support plate (13). A second spring (15) is movably sleeved on the outer portion of the cross bar (14). The second spring (15) is located between the guide block (20) and the support plate (13).

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