A high-shelf picking device for logistics

Abstract

The present invention relates to the field of logistics goods picking, and particularly to a high-shelf goods picking device for logistics, which includes a shelf. At least one storage bin is provided inside the shelf, and a pipe picking mechanism and a sorting mechanism are arranged inside the shelf; pipes are placed inside the storage bin, and a push plate is horizontally slidably arranged inside the storage bin, and the push plate is used for sorting the pipes; the sorting mechanism includes a constant force mechanism and a pulling rope. The constant force mechanism is vertically slidably connected to the shelf, and the constant force mechanism is connected to the push plate through the pulling rope; the purpose of the present invention is to overcome the deficiencies of the prior art and provide a high-shelf goods picking device for logistics, which can pick and place specified pipes and can sort the remaining pipes.

Description

Technical Field

[0001] The present invention relates to the field of logistics goods picking, and in particular, to a high-shelf goods picking device for logistics. Background Art

[0002] Goods picking in logistics is an essential part of the logistics transportation process, mainly used to pick out specified goods for transportation. Usually, manual identification and selection of the required goods are needed in logistics goods picking, and then the goods are manually taken out for transportation. However, it is difficult and inefficient for manual goods picking of goods with a relatively high storage position and a relatively large volume.

[0003] In the prior art, for the logistics goods picking of high shelves, a forklift driven by a human or an intelligent transfer vehicle is usually used to identify and carry the goods. For the former, the transfer of goods requires a forklift driven by a human for operation. When placing the goods, space for the forklift to travel needs to be reserved. When picking up the goods, the goods need to be manually identified and the forklift needs to be lifted to pick up the goods. This method not only requires reserving more space for the forklift to travel, but also has low picking efficiency. For the latter, the picking efficiency is relatively high. However, a specific shelf needs to be installed, and the volume of the goods that can be picked up is limited, and it is impossible to pick up goods that are too long or too wide. For the problem of picking up pipes on high shelves, neither of the two can solve it well. Therefore, it is necessary to pick up pipes on high shelves according to the shape of the pipes.

[0004] For the existing pipe picking, usually a forklift driven by a human is used to pick up a whole bundle of pipes, the required pipes are picked up according to the needs, the pipes are re-tied, and then a forklift driven by a human places the re-tied pipes on the shelf. The operation is cumbersome and the efficiency is low. Therefore, how to design a device that is convenient for picking up pipes on high shelves, can pick up and place specified pipes, and can organize the remaining pipes has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to overcome the deficiencies of the prior art and provide a high-shelf goods picking device for logistics, which can pick up and place specified pipes and can organize the remaining pipes.

[0006] To solve the above technical problems, the technical solution of the present invention is:

[0007] A high-shelf picking device for logistics, comprising a shelf. At least one storage bin is provided inside the shelf. A pipe picking mechanism and a sorting mechanism are arranged inside the shelf. Pipes are placed inside the storage bin. A push plate is horizontally slidably arranged inside the storage bin, and the push plate is used for sorting the pipes. The sorting mechanism includes a constant force mechanism and a pulling rope. The constant force mechanism is vertically slidably connected to the shelf, and the constant force mechanism is connected to the push plate through the pulling rope. The pipe picking mechanism takes out the pipes from the storage bin, and the pipes fall. The force during the falling process of the pipes is converted into a constant pulling force by the constant force mechanism and drives the push plate to slide through the pulling rope, thereby realizing the sorting of the pipes.

[0008] Compared with the prior art, the advantages of the present invention are as follows:

[0009] The present invention uses the pipe picking mechanism to take out the pipes from the storage bin. There is more empty space inside the storage bin. The pipes scatter under the action of gravity. The pipe picking mechanism drives the pipes to fall. The force generated during the falling process of the pipes is converted into a constant pulling force by the constant force mechanism. The constant force mechanism drives the push plate to move with a constant pulling force through the pulling rope. The push plate slides horizontally inside the storage bin, and the push plate pushes the scattered pipes to fill the empty space inside the storage bin, and the sorting of the pipes is completed.

[0010] The sorting mechanism includes a guiding side plate. The guiding side plate is fixedly arranged on the front end face of the shelf. A buffer sliding groove is arranged inside the guiding side plate. A right-angle hook is slidably arranged inside the buffer sliding groove. The buffer sliding groove is slidably connected to the right-angle hook. One end of the right-angle hook is fixedly provided with a blocking block. A buffer compression spring is further arranged inside the buffer sliding groove to buffer the sliding of the right-angle hook.

[0011] The constant force mechanism includes a reset damping shaft. A rope pulley is fixedly arranged on the outer side of the reset damping shaft. A pulling rope is wound around the outer side of the rope pulley. One end of the pulling rope away from the rope pulley is fixedly provided with a slider. The slider is fixedly connected to the push plate, realizing the conversion of external pressure into a constant pulling force.

[0012] A ratchet tooth groove is arranged inside the inner wall of the storage bin. Ratchet teeth are fixedly arranged on the inner wall of the ratchet tooth groove. The ratchet tooth groove is slidably connected to the slider. A ratchet shaft is fixedly arranged inside the slider. A ratchet rod is rotatably arranged on the outer side of the ratchet shaft. One end of the ratchet rod abuts against the slider. A ratchet rod spring is arranged on the outer side of the ratchet shaft. Both ends of the ratchet rod spring are fixedly connected to the ratchet rod and the slider respectively, realizing the one-way sliding of the slider inside the ratchet tooth groove.

[0013] The tube-taking mechanism includes a positioning component, which includes a driving motor and a threaded sleeve. The driving motor is embedded inside the shelf. The driving motor controls a driving motor shaft, and a lead screw is fixedly provided at one end of the driving motor shaft. The lead screw is threadedly connected to the threaded sleeve. A tube-feeding component is provided outside the threaded sleeve, and the movement of the tube-feeding component is controlled by the positioning component.

[0014] The positioning component further includes a radio frequency detector, which is embedded inside the threaded sleeve. An electronic tag is embedded inside the slider. The radio frequency detector is used to detect the position and internal information of the electronic tag to accurately locate the specified slider.

[0015] The tube-feeding component includes a limit base, inside which a stepping motor is embedded. The stepping motor controls a stepping motor shaft, and the stepping motor shaft is fixedly connected to the threaded sleeve. The rotation of the limit base is controlled by the stepping motor.

[0016] A tube-taking motor is embedded inside the limit base. A guiding through hole is provided on the upper side of the limit base. The tube-taking motor controls a tube-taking motor shaft, and a tube-taking wheel is fixedly provided on the outside of the tube-taking motor shaft. The tube-taking wheel is in frictional connection with the pipeline. The pipeline is taken out by the tube-taking motor and guided by the guiding through hole.

[0017] The tube-feeding component further includes a flipping seat, which is rotatably connected to the limit base. A guiding hole is provided at the upper end of the flipping seat, and a limiting hole is also provided at the upper end of the flipping seat. The limiting hole is located on both sides of the guiding hole. A check shaft is rotatably provided on the inner wall of the guiding hole at the upper end of the flipping seat. The check shaft is rotatably connected to a check rod. A stop block is fixedly provided on the inner wall of the guiding hole. A check torsion spring is provided on the outside of the check shaft, and both ends of the check torsion spring are fixedly connected to the check shaft and the check rod respectively. At least one check rod is provided, and a friction block is fixedly provided at one end of the check rod. The one-way movement of the pipeline is restricted by the friction block.

[0018] A torsion shaft is rotatably provided at one end of the limit base, and the torsion shaft is rotatably connected to the flipping seat. A flipping torsion spring is provided on the outside of the torsion shaft, and both ends of the flipping torsion spring are fixedly connected to the flipping seat and the limit base respectively. The rotation of the pipeline by a specified angle is controlled by the limit base. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is a front sectional schematic view of the present invention;

[0021] Figure 3 is Figure 2Enlarged schematic view of part A;

[0022] Figure 4 is Figure 2 Enlarged schematic view of part B;

[0023] Figure 5 is Figure 2 Schematic view in the C-C direction of;

[0024] Figure 6 is Figure 5 Enlarged schematic view of part D;

[0025] Figure 7 is Figure 6 Schematic view in the F-F direction of;

[0026] Figure 8 is Figure 5 Enlarged schematic view of part E;

[0027] Figure 9 is Figure 8 Schematic view in the G-G direction of;

[0028] Figure 10 is Figure 8 Enlarged schematic view of part H;

[0029] Figure 11 is Figure 10 Schematic view in the I-I direction of.

[0030] Reference numerals: 10, shelf; 11, warehouse; 13, push plate; 14, slider; 15, electronic tag; 16, pull rope; 17, ratchet groove; 18, driving motor; 19, driving motor shaft; 20, lead screw; 21, threaded sleeve; 22, RF detector; 23, buffer chute; 24, buffer compression spring; 25, rope pulley; 26, reset damping shaft; 27, right-angle hook; 28, limit base; 29, torsion shaft; 30, flip torsion spring; 31, flip seat; 32, check rod; 33, friction block; 34, check shaft; 35, check torsion spring; 36, stepper motor; 37, stepper motor shaft; 38, tube-taking motor; 39, tube-taking motor shaft; 40, tube-taking wheel; 41, through slot; 42, ratchet rod; 43, ratchet shaft; 44, ratchet rod spring; 45, positioning assembly; 46, tube-taking mechanism; 47, sorting mechanism; 48, guiding side plate; 49, guiding through hole; 50, guiding hole; 60, ratchet teeth. Detailed implementation manners

[0031] The following further details the specific implementation manners of the present invention with reference to the accompanying drawings, so that the technical solutions of the present invention are easier to understand and master.

[0032] Refer to Figure 2 , Figure 3 and Figure 5As shown, this embodiment provides a high-shelf picking device for logistics, which can pick and place pipes for a specified pipeline and can also organize the remaining pipes.

[0033] It includes a shelf 10, and at least one storage bin 11 is provided inside the shelf 10. It is characterized in that a pipe picking mechanism 46 and an organizing mechanism 47 for picking pipes are provided inside the shelf 10; pipes are placed inside the storage bin 11, and a push plate 13 is horizontally slidably arranged inside the storage bin 11, and the push plate 13 is used to organize the pipes; the organizing mechanism 47 includes a constant force mechanism and a pulling rope 16. The constant force mechanism is vertically slidably connected to the shelf 10, and the constant force mechanism is connected to the push plate 13 through the pulling rope 16. The pipe picking mechanism 46 takes out the pipes from the storage bin 11, and the pipes fall. The force during the falling process of the pipes is converted into a constant pulling force by the constant force mechanism and drives the push plate 13 to slide through the pulling rope 16, thereby realizing the organization of the pipes.

[0034] Specifically:

[0035] Combined with Figure 2 and Figure 4 As shown, the organizing mechanism 47 includes a guiding side plate 48, the guiding side plate 48 is fixedly arranged on the front end face of the shelf 10, a buffer sliding groove 23 is provided inside the guiding side plate 48, a right-angle hook 27 is slidably arranged inside the buffer sliding groove 23, the buffer sliding groove 23 is slidably connected to the right-angle hook 27, a stop block is fixedly arranged at one end of the right-angle hook 27, and a buffer compression spring 24 is further provided inside the buffer sliding groove 23 to buffer the sliding of the right-angle hook 27;

[0036] The constant force mechanism includes a reset damping shaft 26, a rope pulley 25 is fixedly arranged on the outside of the reset damping shaft 26, a pulling rope 16 is wound around the outside of the rope pulley 25, a slider 14 is fixedly arranged at the end of the pulling rope 16 away from the rope pulley 25, and the slider 14 is fixedly connected to the push plate 13 to convert the external pressure into a constant pulling force through the constant force mechanism;

[0037] A ratchet tooth groove 17 is provided inside the inner wall of the storage bin 11, ratchet teeth 60 are fixedly arranged on the inner wall of the ratchet tooth groove 17, the ratchet tooth groove 17 is slidably connected to the slider 14, a ratchet shaft 43 is fixedly arranged inside the slider 14, a ratchet rod 42 is rotatably arranged on the outside of the ratchet shaft 43, one end of the ratchet rod 42 abuts against the slider 14, and a ratchet rod spring 44 is arranged on the outside of the ratchet shaft 43. Both ends of the ratchet rod spring 44 are fixedly connected to the ratchet rod 42 and the slider 14 respectively to realize the one-way sliding of the slider 14 inside the ratchet tooth groove 17.

[0038] With the above device, the right-angle hook 27 supports the pipeline. When the pipeline drops, it drives the right-angle hook 27 to slide. The buffer compression spring 24 buffers the right-angle hook 27. During the dropping process of the pipeline, it drives the reset damping shaft 26 and the rope pulley 25 to move downward. The pulling rope 16 unfolds outside the rope pulley 25. The internal tension of the pulling rope 16 is the same as the damping force of the reset damping shaft 26. The pulling rope 16 drives the push plate 13 to slide with a constant pulling force, and the push plate 13 arranges the pipeline with a constant pushing force.

[0039] Combined Figure 2 As shown, the pipe taking mechanism 46 includes a positioning component 45. The positioning component 45 includes a driving motor 18 and a threaded sleeve 21. The driving motor 18 is embedded inside the shelf 10. The driving motor 18 controls a driving motor shaft 19. One end of the driving motor shaft 19 is fixedly provided with a lead screw 20. The lead screw 20 is threadedly connected to the threaded sleeve 21. A pipe feeding component is arranged outside the threaded sleeve 21. The pipe feeding component is controlled to move by the positioning component 45.

[0040] The positioning component 45 further includes a radio frequency detector 22. The radio frequency detector 22 is embedded inside the threaded sleeve 21. An electronic tag 15 is embedded inside the slider 14. The radio frequency detector 22 is used to detect the position and internal information of the electronic tag 15 to accurately find the specified slider 14.

[0041] With the above device, the driving motor 18 controls the movement of the lead screw 20 through the driving motor shaft 19. The threaded sleeve 21 drives the pipe feeding component and the radio frequency detector 22 to move. After the radio frequency detector 22 detects the specified electronic tag 15, the pipe feeding component takes out the pipeline.

[0042] In order to control the rotation of the pipeline, the pipe feeding component includes a limiting base 28. A stepping motor 36 is embedded inside the limiting base 28. The stepping motor 36 controls a stepping motor shaft 37. The stepping motor shaft 37 is fixedly connected to the threaded sleeve 21. The rotation of the limiting base 28 is controlled by the stepping motor 36.

[0043] In order to guide the pipeline, a pipe taking motor 38 is embedded inside the limiting base 28. A guiding through hole 49 is opened on the upper side of the limiting base 28. The pipe taking motor 38 controls a pipe taking motor shaft 39. A pipe taking wheel 40 is fixedly arranged outside the pipe taking motor shaft 39. The pipe taking wheel 40 is in frictional connection with the pipeline. The pipeline is taken out by the pipe taking motor 38 and guided by the guiding through hole 49.

[0044] To control the unidirectional movement of the pipeline, the pipe feeding assembly further includes a flipping base 31, which is rotatably connected to the limiting base 28. A guiding hole 50 is formed in the upper end of the flipping base 31, and a limiting hole is also formed in the upper end of the flipping base 31. The limiting holes are located on both sides of the guiding hole 50. A check shaft 34 is rotatably arranged on the inner wall of the guiding hole 50 at the upper end of the flipping base 31. The check shaft 34 is rotatably connected to a check rod 32. A stop block is fixedly arranged on the inner wall of the guiding hole 50. A check torsion spring 35 is arranged on the outer side of the check shaft 34. Two ends of the check torsion spring 35 are respectively fixedly connected to the check shaft 34 and the check rod 32. At least one check rod 32 is provided. A friction block 33 is fixedly arranged at one end of the check rod 32. The unidirectional movement of the pipeline is restricted by the friction block 33;

[0045] To realize the reset of the limiting base 28 after it is separated from the pipeline, a torsion shaft 29 is rotatably arranged at one end of the limiting base 28. The torsion shaft 29 is rotatably connected to the flipping base 31. A flipping torsion spring 30 is arranged on the outer side of the torsion shaft 29. Two ends of the flipping torsion spring 30 are respectively fixedly connected to the flipping base 31 and the limiting base 28. The reset of the limiting base 28 after it is separated from the pipeline is realized through the limiting base 28.

[0046] Implementation principle: When a pipe needs to be taken out, the model of the pipe to be taken out is manually sent to the radio frequency detector 22. The driving motor 18 controls the rotation of the lead screw 20 through the driving motor shaft 19. The lead screw 20 drives the threaded sleeve 21, and the threaded sleeve 21 drives the limit base 28 and the radio frequency detector 22 to move. The limit base 28 drives the pipe taking wheel 40 to move through the pipe taking motor 38 and the pipe taking motor shaft 39. The radio frequency detector 22 detects the information of the electronic tag 15. After the radio frequency detector 22 detects the specified information, the radio frequency detector 22 is directly below the electronic tag 15. At the same time, the pipe taking wheel 40 contacts the lower end face of the pipe. The pipe taking motor 38 controls the rotation of the pipe taking wheel 40 through the pipe taking motor shaft 39, and the pipe taking wheel 40 drives the pipe to be disengaged from the inside of the storage bin 11. The pipe passes through the guiding through hole 49 on the upper side of the limit base 28, and then the pipe passes through the limit hole and the guiding hole 50 to push the check rod 32 to turn over, and the check torsion spring 35 is compressed. Due to the friction of the friction block 33 and the fact that the check rod 32 can only turn over in one direction, the pipe passes through the guiding hole 50 unidirectionally. After the pipe is completely disengaged from the inside of the storage bin 11, the stepping motor 36 controls the limit base 28 to rotate 90 degrees relative to the threaded sleeve 21 through the stepping motor shaft 37. The driving motor 18 controls the rotation of the lead screw 20 through the driving motor shaft 19. The lead screw 20 drives the threaded sleeve 21, and the threaded sleeve 21 drives the limit base 28 and the pipe to move to the right. One end of the pipe abuts against the guiding side plate 48 on the front end face of the shelf 10. Due to the friction of the friction block 33 and the restriction of the stop block on one side of the check rod 32, the position of the pipe relative to the guiding hole 50 remains unchanged. The pipe drives the turning seat 31 to rotate 90 degrees under the restricting action of the guiding side plate 48, and the turning torsion spring 30 is compressed. The pipe abuts against the right-angle hook 27, and the pipe falls under the action of gravity. The pipe drives the reset damping shaft 26 and the rope wheel 25 to move downward through the right-angle hook 27, and the buffer compression spring 24 is compressed. The rope wheel 25 drives the slider 14 to move through the pull rope 16, and the slider 14 drives the ratchet shaft 43 and the ratchet lever 42 to move. Under the torsional force of the ratchet lever spring 44, the ratchet lever 42 abuts against the ratchet teeth 60 on the inner wall of the ratchet tooth groove 17. The slider 14 drives the push plate 13 to press the pipe tightly. When the pressure between the push plate 13 and the pipe is equal to the damping force between the reset damping shaft 26 and the right-angle hook 27, the pull rope 16 unfolds on the outer side of the rope wheel 25. After the pipe drives the right-angle hook 27 to slide to the bottom of the ratchet tooth groove 17, the pipe is manually taken off, and each mechanism of the equipment is reset. Due to the ratchet lever 42 abutting against the ratchet teeth 60 on the inner wall of the ratchet tooth groove 17, the push plate 13 will not drive the slider 14 to move to the right under the pressure of the pipe inside the storage bin 11.

[0047] The above are only typical examples of the present invention. In addition, the present invention can also have many other specific implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A high-shelf picking device for logistics, comprising a shelf (10), wherein at least one cargo compartment (11) is provided inside the shelf (10), and it is characterized in that , inside the shelf (10), there is a pipe-taking mechanism (46) and an organizing mechanism (47) for taking pipes; inside the storage bin (11), pipes are placed, and a push plate (13) is horizontally slidably arranged inside the storage bin (11), and the push plate (13) is used for organizing the pipes; the organizing mechanism (47) includes a constant-force mechanism and a pulling rope (16), the constant-force mechanism is vertically slidably connected to the shelf (10), the constant-force mechanism is connected to the push plate (13) through the pulling rope (16), the pipe-taking mechanism (46) takes out the pipes from the storage bin (11), the pipes fall, and the force during the falling process of the pipes is converted into a constant pulling force by the constant-force mechanism and drives the push plate (13) to slide through the pulling rope (16) so as to realize organizing the pipes; the organizing mechanism (47) includes a guiding side plate (48), the guiding side plate (48) is fixedly arranged on the front end face of the shelf (10), a buffer sliding groove (23) is opened inside the guiding side plate (48), and a right-angle hook (27) is slidably arranged inside the buffer sliding groove (23); the constant-force mechanism includes a reset damping shaft (26), a rope pulley (25) is fixedly arranged on the outer side of the reset damping shaft (26), the pulling rope (16) is wound around the outer side of the rope pulley (25), a slider (14) is fixedly arranged at one end of the pulling rope (16) far away from the rope pulley (25), and the slider (14) is fixedly connected to the push plate (13); the pipe-taking mechanism (46) includes a positioning component (45), the positioning component (45) includes a driving motor (18) and a threaded sleeve (21), and a pipe-feeding component is arranged on the outer side of the threaded sleeve (21); the pipe-feeding component includes a limiting base (28), a stepping motor (36) is embedded inside the limiting base (28), the stepping motor (36) controls a stepping motor shaft (37), and the stepping motor shaft (37) is fixedly connected to the threaded sleeve (21); the pipe-feeding component further includes a flipping seat (31), the flipping seat (31) is rotatably connected to the limiting base (28), a guiding hole (50) is opened at the upper end of the flipping seat (31), a check shaft (34) is rotatably arranged on the inner wall of the guiding hole (50) at the upper end of the flipping seat (31), the check shaft (34) is rotatably connected to a check rod (32), a stop block is fixedly arranged on the inner wall of the guiding hole (50), a check torsion spring (35) is arranged on the outer side of the check shaft (34), and two ends of the check torsion spring (35) are respectively fixedly connected to the check shaft (34) and the check rod (32), at least one check rod (32) is provided, and a friction block (33) is fixedly arranged at one end of the check rod (32).

2. The high-shelf picking device for logistics according to claim 1, characterized in that, the buffer sliding groove (23) is slidably connected to the right-angle hook (27), a stop block is fixedly arranged at one end of the right-angle hook (27), and a buffer compression spring (24) is further arranged inside the buffer sliding groove (23).

3. The high-shelf picking device for logistics according to claim 1, characterized in that, The inner wall of the storage bin (11) is internally provided with a ratchet tooth groove (17). The inner wall of the ratchet tooth groove (17) is fixedly provided with ratchet teeth (60). The ratchet tooth groove (17) is slidably connected to the slider (14). A ratchet shaft (43) is fixedly arranged inside the slider (14). A ratchet rod (42) is rotatably arranged on the outer side of the ratchet shaft (43). One end of the ratchet rod (42) abuts against the slider (14). A ratchet rod spring (44) is arranged on the outer side of the ratchet shaft (43). Both ends of the ratchet rod spring (44) are fixedly connected to the ratchet rod (42) and the slider (14) respectively.

4. A high-shelf picking device for logistics according to claim 1, characterized in that, The driving motor (18) is embedded inside the shelf (10). The driving motor (18) controls a driving motor shaft (19). One end of the driving motor shaft (19) is fixedly provided with a lead screw (20). The lead screw (20) is in threaded connection with the threaded sleeve (21).

5. The high-shelf picking device for logistics according to claim 1, wherein The positioning component (45) further includes a radio frequency detector (22). The radio frequency detector (22) is embedded inside the threaded sleeve (21). An electronic tag (15) is embedded inside the slider (14). The radio frequency detector (22) is used to detect the position and internal information of the electronic tag (15).

6. The high-shelf picking device for logistics according to claim 1, wherein A tube-taking motor (38) is embedded inside the limiting base (28). A guiding through hole (49) is formed in the upper side of the limiting base (28). The tube-taking motor (38) controls a tube-taking motor shaft (39). A tube-taking wheel (40) is fixedly arranged on the outer side of the tube-taking motor shaft (39). The tube-taking wheel (40) is in frictional connection with the pipeline.

7. A high-shelf picking device for logistics according to claim 1, characterized in that, A limiting hole is further formed in the upper end of the flipping seat (31). The limiting hole is located on both sides of the guiding hole (50).

8. The high-shelf picking device for logistics according to claim 1, characterized in that, One end of the limiting base (28) is rotatably provided with a torsion shaft (29). The torsion shaft (29) is rotatably connected to the flipping seat (31). A flipping torsion spring (30) is arranged on the outer side of the torsion shaft (29). Both ends of the flipping torsion spring (30) are fixedly connected to the flipping seat (31) and the limiting base (28) respectively.

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