Bagging, self-sealing and stacking all-in-one machine

The bagging and self-sealing palletizing machine automates clothing packaging by integrating machines for bag opening, material movement, and palletizing, enhancing efficiency by eliminating manual steps.

CN222247923UActive Publication Date: 2024-12-27合肥华普动力数控科技有限公司
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Patent Information

Application Number
CN202421166581.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-27
Publication Date
2024-12-27
Estimated Expiration
2034-05-27

AI Technical Summary

Technical Problem

Existing clothing packaging systems lack automation in bagging, sealing, and palletizing processes, requiring manual auxiliary operations and resulting in low work efficiency.

Method used

A bagging and self-sealing palletizing machine integrating a glue peeling and packaging machine, air blowing bag opening machine, material grabbing and horizontally moving mechanical arm, and palletizing machine, which automates the process by blowing open packaging bags, moving materials, and stacking them on a palletizer.

Benefits of technology

Achieves full automation of bagging, sealing, and palletizing with high efficiency by using the integrated machine, eliminating the need for manual operations.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a bagging self-sealing stacking all-in-one machine which comprises a glue tearing packaging machine, a blowing type bag opening machine, a material grabbing horizontal moving type mechanical arm and a stacking machine, the feeding end of the glue tearing packaging machine is provided with the blowing type bag opening machine, and material movement is achieved through the material grabbing horizontal moving type mechanical arm. A stacker crane is mounted at the discharging end of the glue tearing and packaging machine; the air blowing type bag opening machine is used for blowing air to packaging bags, folded clothes are put into the packaging bags, then the material grabbing horizontal moving type mechanical arm is used for moving the packaging bags to the glue tearing and packaging machine to complete glue tearing and packaging operation, finally, the packaging bags are stacked on the stacking machine, overall automation of bagging, sealing and stacking is achieved, and the working efficiency is high.
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Description

Technical Field

[0001] The utility model relates to the technical field of clothing packaging, in particular to a bagging, self-sealing and palletizing integrated machine. Background Art

[0002] During the clothing packaging process, the clothing packaging operation is completed through bagging, sealing, and storage and transfer.

[0003] A glue peeling and packaging machine with patent application number 202221203137.3 completes the sealing of packaging bags. It cannot realize the overall automation of bagging, sealing, storage and stacking, and thus requires manual auxiliary operations, resulting in low work efficiency. Utility Model Content

[0004] The utility model solves the problem of providing a bagging, self-sealing and palletizing integrated machine, thereby solving the above-mentioned technical problems.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The invention discloses a bagging and self-sealing palletizing machine, comprising a glue peeling and packaging machine, an air blowing bag opening machine, a material grabbing and horizontally moving mechanical arm and a palletizing machine. The feeding end of the glue peeling and packaging machine is equipped with an air blowing bag opening machine, and the material movement is achieved by the material grabbing and horizontally moving mechanical arm. The discharging end of the glue peeling and packaging machine is equipped with a palletizing machine.

[0007] Preferably, the air blowing bag opening machine comprises a stand, a built-in groove, and a carrying plate, the stand is provided with a built-in groove, a carrying plate is rotatably installed inside the built-in groove, side limit seats are symmetrically installed on both sides of the carrying plate, a bottom limit seat is installed between the two side limit seats, a blowing seat is installed in the middle of the inner side of the built-in groove and above the carrying plate, a sealing plate is installed above the blowing seat, and clamping seats are installed on the inner side of the built-in groove and on both sides of the blowing seat;

[0008] A protrusion is provided in the middle of the blowing seat, a blowing hole facing the supporting plate is provided on the bottom side of the protrusion, an air inlet hole is provided on the blowing seat, an air groove is provided on the blowing seat, and both ends of the air groove are respectively connected to the air inlet hole and the blowing hole.

[0009] Preferably, a support frame is installed inside the platform, a connecting arm is symmetrically installed at one end of the support frame, the connecting arm is connected to one end of the supporting plate through an inserted shaft, a first pneumatic cylinder is installed on the bottom side of the middle part of the support frame, an ear seat is installed on the telescopic end of the first pneumatic cylinder, and the ear seat is connected to the U-shaped seat in the middle of the bottom side of the supporting plate through an inserted shaft.

[0010] Preferably, the material grabbing horizontal movable mechanical arm comprises a support plate, a reducer, a motor, a first swing arm shell and a second swing arm shell, the reducer is installed on the top side of the support plate, the reducer input end is connected to the motor output end, the reducer output end is fixedly connected to one end of the first swing arm shell, the other end of the first swing arm shell is penetrated by a first rotating shaft for rotation, one end of the first rotating shaft is fixedly connected to one end of the second swing arm shell, the other end of the second swing arm shell is penetrated by a second rotating shaft for rotation, a mounting frame is fixedly sleeved on the second rotating shaft, a second pneumatic cylinder is installed on the side wall of the mounting frame, an adjusting frame is installed on the telescopic end of the second pneumatic cylinder, support tubes are symmetrically installed on the bottom sides of both ends of the adjusting frame, and a suction cup is installed on the bottom end of the support tube;

[0011] The first tumble arm housing, the second tumble arm housing and the second rotating shaft rotate synchronously, and the first tumble arm housing and the second tumble arm housing rotate in opposite directions, while the first tumble arm housing and the second rotating shaft rotate in the same direction.

[0012] Preferably, a first shaft seat is installed on the outside of the reducer, the reducer output end passes through the first shaft seat, and the first shaft seat is connected to the reducer output end through a bearing, and a first large sprocket is mounted on one end of the first shaft seat and located on the outside of the reducer output end.

[0013] Preferably, a second small sprocket is installed at the other end of the first rotating shaft, and the second small sprocket is connected to the first large sprocket via a chain transmission.

[0014] Preferably, a second shaft seat is installed on the outer side of the other end of the first swing arm shell, the second rotating shaft passes through the second shaft seat, and the second rotating shaft and the second shaft seat are connected through a bearing, and a first small synchronous wheel is mounted on the end of the second shaft seat and located on the outer side of the second rotating shaft.

[0015] Preferably, the other end of the second rotating shaft is located in the second rotating arm shell and a second large synchronous wheel is installed therein, the first small synchronous wheel and the second large synchronous wheel are connected through a synchronous belt transmission, a third shaft seat is installed on the outer side of the other end of the second rotating arm shell, the second rotating shaft passes through the third shaft seat, and the second rotating shaft and the third shaft seat are connected through a bearing.

[0016] Preferably, the palletizer comprises a frame, a third rotating shaft is symmetrically mounted on a feeding opening on the top side of the frame, and a feeding plate is mounted on the third rotating shaft.

[0017] Preferably, a third pneumatic cylinder is vertically installed in the frame, and a U-shaped lifting seat is installed at the telescopic end of the top of the third pneumatic cylinder. Two first connecting rods arranged in a V shape are rotatably installed in the lifting seat, the top ends of the two first connecting rods are respectively rotatably connected to one end of the third connecting rod, the other end of the third connecting rod is rotatably connected to the bottom end of the fourth connecting rod, and the top end of the fourth connecting rod is connected to the third rotating shaft, the middle parts of the two first connecting rods are respectively rotatably connected to the bottom ends of the second connecting rods, and the top ends of the two second connecting rods are respectively rotatably connected to the middle part of the frame.

[0018] The beneficial effects of the utility model are as follows: air is blown into the packaging bag by the air-blowing bag opener to put the folded clothes into the packaging bag, and then the packaging bag is moved to the glue-tearing and packaging machine by the material-grabbing horizontal movable mechanical arm to complete the glue-tearing and packaging operation, and finally the packaging bag is stacked on the palletizer to realize the automation of bagging, sealing and palletizing as a whole, with high work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the utility model

[0020] Figure 2 This is a schematic diagram of the overall structure of the air-blowing bag opening machine of the utility model;

[0021] Figure 3 For this utility model Figure 2 A partial enlarged view of the middle A area;

[0022] Figure 4 This is a schematic diagram of the internal structure of the test stand of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the blowing seat of the utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the material grabbing horizontal movable mechanical arm of the utility model;

[0025] Figure 7 This is a schematic diagram of the internal structure of the material grabbing horizontal movable mechanical arm of the utility model;

[0026] Figure 8 This is a side view of the palletizer of the utility model;

[0027] Fig. 9 This is a schematic diagram of the installation structure of the rotating shaft and the blanking plate of the utility model.

[0028] Legend:

[0029] 1. Glue peeling and packaging machine; 2. Air blowing bag opening machine; 3. Material grabbing horizontal moving mechanical arm; 4. Palletizer;

[0030] 201, stand; 202, built-in groove; 203, bearing plate; 204, side limit seat; 205, bottom limit seat; 206, blowing seat; 207, sealing plate; 208, holder; 209, support frame; 210, first pneumatic cylinder; 211, U-shaped seat; 212, ear seat; 213, connecting arm; 214, protrusion; 215, air inlet hole; 216, air blowing hole; 217, air groove;

[0031] 301, support plate; 302, reducer; 303, motor; 304, first shaft seat; 305, first swing arm shell; 306, second shaft seat; 307, second swing arm shell; 308, third shaft seat; 309, first rotating shaft; 310, second rotating shaft; 311, mounting frame; 312, second pneumatic cylinder; 313, adjusting frame; 314, support pipe; 315, suction cup; 316, first large chain tooth; 317, second small chain tooth; 318, chain; 319, first small synchronous wheel; 320, second large synchronous wheel; 321, synchronous belt;

[0032] 401, frame; 402, third rotating shaft; 403, blanking plate; 404, third pneumatic cylinder; 405, lifting seat; 406, first connecting rod; 407, second connecting rod; 408, third connecting rod; 409, fourth connecting rod. DETAILED DESCRIPTION

[0033] 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.

[0034] Specific examples are given below.

[0035] See also Figures 1 to 9 The invention discloses a bagging and self-sealing palletizing machine, comprising a glue tearing and packaging machine 1, an air-blowing bag opening machine 2, a material grabbing and horizontally moving mechanical arm 3 and a palletizer 4. The feeding end of the glue tearing and packaging machine 1 is equipped with an air-blowing bag opening machine 2, and the material movement is realized by the material grabbing and horizontally moving mechanical arm 3. The discharging end of the glue tearing and packaging machine 1 is equipped with a palletizer 4. The packaging bag is blown by the air-blowing bag opening machine 2 to put the folded clothes into the packaging bag. Then, the packaging bag is moved to the glue tearing and packaging machine 1 by the material grabbing and horizontally moving mechanical arm 3 to complete the glue tearing and packaging operation. Finally, the packaging bag is palletized on the palletizer 4.

[0036] The air blowing bag opening machine 2 includes a stand 201, a built-in groove 202, and a bearing plate 203. The stand 201 is provided with a built-in groove 202, and a bearing plate 203 is rotatably installed inside the built-in groove 202. Side limit seats 204 are symmetrically installed on both sides of the bearing plate 203, and a bottom limit seat 205 is installed between the two side limit seats 204. A blowing seat 206 is installed in the middle of the inner side of the built-in groove 202 and above the bearing plate 203, and a sealing plate 207 is installed above the blowing seat 206. A clamping seat 208 is installed on the inner side of the built-in groove 202 and on both sides of the blowing seat 206. A protrusion 214 is provided in the middle of the blowing seat 206, and the bottom side of the protrusion 214 is provided with a protrusion 214. A blowing hole 216 is provided toward the carrying plate 203, an air inlet hole 215 is provided on the blowing seat 206, an air groove 217 is provided on the blowing seat 206, and both ends of the air groove 217 are respectively connected with the air inlet hole 215 and the blowing hole 216, a support frame 209 is installed inside the stand 201, a connecting arm 213 is symmetrically installed at one end of the support frame 209, the connecting arm 213 is connected to one end of the carrying plate 203 through an inserted shaft, a first pneumatic cylinder 210 is installed at the bottom side of the middle part of the support frame 209, an ear seat 212 is installed at the telescopic end of the first pneumatic cylinder 210, and the ear seat 212 is connected to the U-shaped seat 211 in the middle of the bottom side of the carrying plate 203 through an inserted shaft;

[0037] A plurality of clothing packaging bags are stacked and placed on the carrying plate 203, and are limited by the side limit seat 204 and the bottom limit seat 205. The ear seat 212 is driven to move by the first pneumatic cylinder 210, and cooperates with the U-shaped seat 211 to drive the carrying plate 203 to rotate and move upward with the insertion axis of the connecting arm 213 as the center. The air pump works, and the air passes through the air inlet hole 215 and the air groove 217, and finally blows toward the clothing packaging bag from the blowing hole 216 of the protrusion 214 on the blowing seat 206, so as to expand and open the clothing packaging bag, making it easy to put the clothes into the packaging bag.

[0038] The material grabbing horizontal movable mechanical arm 3 includes a support plate 301, a reducer 302, a motor 303, a first arm shell 305 and a second arm shell 307. The reducer 302 is installed on the top side of the support plate 301, the input end of the reducer 302 is connected to the output end of the motor 303, the output end of the reducer 302 is fixedly connected to one end of the first arm shell 305, the other end of the first arm shell 305 is penetrated and rotatably installed with a first rotating shaft 309, one end of the first rotating shaft 309 is fixedly connected to one end of the second arm shell 307, the other end of the second arm shell 307 is penetrated and rotatably installed with a second rotating shaft 310, a mounting frame 311 is fixedly sleeved on the second rotating shaft 310, a second pneumatic cylinder 312 is installed on the side wall of the mounting frame 311, an adjusting frame 313 is installed on the telescopic end of the second pneumatic cylinder 312, support tubes 314 are symmetrically installed on the bottom sides of both ends of the adjusting frame 313, and a suction cup 315 is installed on the bottom end of the support tube 314;

[0039] The first arm housing 305, the second arm housing 307 and the second rotating shaft 310 rotate synchronously, and the first arm housing 305 and the second arm housing 307 rotate in opposite directions, and the first arm housing 305 and the second rotating shaft 310 rotate in the same direction;

[0040] A first shaft seat 304 is installed outside the reducer 302, the output end of the reducer 302 passes through the first shaft seat 304, and the first shaft seat 304 is connected to the output end of the reducer 302 through a bearing, and a first large sprocket 316 is installed at one end of the first shaft seat 304 and outside the output end of the reducer 302;

[0041] A second small sprocket 317 is installed at the other end of the first rotating shaft 309, and the second small sprocket 317 and the first large sprocket 316 are connected by a chain 318;

[0042] A second shaft seat 306 is installed on the outer side of the other end of the first rotating arm housing 305, and the second rotating shaft 310 passes through the second shaft seat 306. The second rotating shaft 310 and the second shaft seat 306 are connected through a bearing. A first small synchronous wheel 319 is mounted on the end of the second shaft seat 306 and located on the outer side of the second rotating shaft 310;

[0043] The other end of the second rotating shaft 310 is located in the second rotating arm housing 307 and is installed with a second large synchronous wheel 320. The first small synchronous wheel 319 and the second large synchronous wheel 320 are connected by a synchronous belt 321. The other end of the second rotating arm housing 307 is installed on the outer side of the third shaft seat 308. The second rotating shaft 310 passes through the third shaft seat 308, and the second rotating shaft 310 and the third shaft seat 308 are connected by a bearing.

[0044] The motor 303 works, the speed reducer 302 is adjusted, and then the first shaft 309 is driven to rotate, so as to realize the rotation of the first arm shell 305. When the first arm shell 305 rotates, the first large sprocket 316 is fixed. At this time, the second small sprocket 317 rotates with the rotation of the first arm shell 305, in cooperation with the chain 318 and the first large sprocket 316, to realize the rotation of the first shaft 309. The first shaft 309 drives the second arm shell 307 to rotate, and the first small synchronous wheel 319 is fixed. At this time, the second large synchronous wheel 320 rotates with the rotation of the second arm shell 307, in cooperation with the synchronous belt 321 and the first small synchronous wheel 319. The second rotating shaft 310 drives the mounting frame 311 to rotate with the cooperation of the synchronous wheel 319, and the adjusting frame 313 is driven to rise and fall through the operation of the second pneumatic cylinder 312 to ensure that the suction cup 315 is adsorbed on the clothing material. With the rotation and cooperation of the first rotating arm shell 305, the second rotating arm shell 307 and the mounting frame 311, the clothing material is translated, and the grasping translation of the clothing material is realized. When the first rotating arm shell 305 and the mounting frame 311 rotate clockwise, the second rotating arm shell 307 rotates counterclockwise. When the first rotating arm shell 305 and the mounting frame 311 rotate counterclockwise, the second rotating arm shell 307 rotates clockwise.

[0045] The palletizer 4 includes a frame 401, a third rotating shaft 402 is symmetrically rotatably installed at the top side of the unloading port of the frame 401, a blanking plate 403 is installed on the third rotating shaft 402, a third pneumatic cylinder 404 is vertically installed in the frame 401, a U-shaped lifting seat 405 is installed at the top telescopic end of the third pneumatic cylinder 404, and two first connecting rods 406 arranged in a V shape are rotatably installed in the lifting seat 405, the top ends of the two first connecting rods 406 are respectively rotatably connected to one end of the third connecting rod 408, the other end of the third connecting rod 408 is rotatably connected to the bottom end of the fourth connecting rod 409, and the top end of the fourth connecting rod 409 is rotatably connected to the third connecting rod 408. The rotating shaft 402 is connected, the middle parts of the two first connecting rods 406 are rotatably connected to the bottom ends of the second connecting rods 407, and the top ends of the two second connecting rods 407 are rotatably connected to the middle parts of the frame 401, and the lifting seat 405 is driven to move by the extension of the third pneumatic cylinder 404. At this time, the first connecting rod 406, the second connecting rod 407, the third connecting rod 408 and the fourth connecting rod 409 cooperate to realize the synchronous reverse rotation of the two third rotating shafts 402 and the rotation of the blanking plate 403. When the packaging bags are located on the blanking plate 403, the blanking plate 403 rotates downward, and the packaging bags automatically fall down for stacking.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. The integrated bagging and self-sealing palletizing machine is characterized by: The invention comprises a glue peeling and packaging machine (1), an air blowing bag opening machine (2), a material grabbing and horizontally movable mechanical arm (3) and a palletizer (4); the glue peeling and packaging machine (1) is provided with an air blowing bag opening machine (2) at the feeding end, and material movement is achieved by means of the material grabbing and horizontally movable mechanical arm (3); and the glue peeling and packaging machine (1) is provided with a palletizer (4) at the discharging end.

2. The bagging, self-sealing and palletizing integrated machine according to claim 1, characterized in that: The air-blowing bag opening machine (2) comprises a stand (201), a built-in groove (202), and a bearing plate (203); the stand (201) is provided with a built-in groove (202); a bearing plate (203) is rotatably mounted inside the built-in groove (202); side limit seats (204) are symmetrically mounted on both sides of the bearing plate (203); a bottom limit seat (205) is mounted between the two side limit seats (204); a blowing seat (206) is mounted in the middle of the inner side of the built-in groove (202) and above the bearing plate (203); a sealing plate (207) is mounted above the blowing seat (206); and a clamping seat (208) is mounted on the inner side of the built-in groove (202) and on both sides of the blowing seat (206); A protrusion (214) is provided in the middle of the air blowing seat (206); a blowing hole (216) facing the supporting plate (203) is provided on the bottom side of the protrusion (214); an air inlet hole (215) is provided on the air blowing seat (206); an air groove (217) is provided on the air blowing seat (206), and two ends of the air groove (217) are respectively connected to the air inlet hole (215) and the air blowing hole (216).

3. The bagging, self-sealing and palletizing integrated machine according to claim 2, characterized in that: A support frame (209) is installed inside the platform (201), a connecting arm (213) is symmetrically installed at one end of the support frame (209), and the connecting arm (213) is connected to one end of the bearing plate (203) through an insertion shaft. A first pneumatic cylinder (210) is installed on the bottom side of the middle part of the support frame (209), and an ear seat (212) is installed at the telescopic end of the first pneumatic cylinder (210), and the ear seat (212) is connected to a U-shaped seat (211) in the middle of the bottom side of the bearing plate (203) through an insertion shaft.

4. The bagging, self-sealing and palletizing integrated machine according to claim 1, characterized in that: The material grabbing horizontal movable mechanical arm (3) comprises a support plate (301), a reducer (302), a motor (303), a first rotating arm shell (305) and a second rotating arm shell (307). The reducer (302) is installed on the top side of the support plate (301). The input end of the reducer (302) is connected to the output end of the motor (303). The output end of the reducer (302) is fixedly connected to one end of the first rotating arm shell (305). The other end of the first rotating arm shell (305) is penetrated by a first rotating shaft (309) for rotation. The first rotating shaft One end of the housing (309) is fixedly connected to one end of the second arm housing (307); the other end of the second arm housing (307) is penetrated by a second rotating shaft (310) for rotation; a mounting frame (311) is fixedly mounted on the second rotating shaft (310); a second pneumatic cylinder (312) is mounted on the side wall of the mounting frame (311); an adjusting frame (313) is mounted on the telescopic end of the second pneumatic cylinder (312); support tubes (314) are symmetrically mounted on the bottom sides of both ends of the adjusting frame (313); a suction cup (315) is mounted on the bottom end of the support tube (314); The first rotating arm housing (305), the second rotating arm housing (307) and the second rotating shaft (310) rotate synchronously, and the first rotating arm housing (305) and the second rotating arm housing (307) rotate in opposite directions, while the first rotating arm housing (305) and the second rotating shaft (310) rotate in the same direction.

5. The bagging, self-sealing and palletizing integrated machine according to claim 4, characterized in that: A first shaft seat (304) is installed on the outside of the reducer (302), the output end of the reducer (302) passes through the first shaft seat (304), and the first shaft seat (304) is connected to the output end of the reducer (302) through a bearing, and a first large sprocket (316) is mounted on one end of the first shaft seat (304) and located on the outside of the output end of the reducer (302).

6. The bagging, self-sealing and palletizing integrated machine according to claim 5, characterized in that: A second small sprocket (317) is installed at the other end of the first rotating shaft (309), and the second small sprocket (317) and the first large sprocket (316) are connected by a chain (318).

7. The bagging, self-sealing and palletizing integrated machine according to claim 6, characterized in that: A second shaft seat (306) is installed on the outer side of the other end of the first rotating arm housing (305), the second rotating shaft (310) passes through the second shaft seat (306), and the second rotating shaft (310) and the second shaft seat (306) are connected via a bearing, and a first small synchronous wheel (319) is sleeved on the end of the second shaft seat (306) and located on the outer side of the second rotating shaft (310).

8. The bagging, self-sealing and palletizing integrated machine according to claim 7, characterized in that: The other end of the second rotating shaft (310) is located in the second rotating arm housing (307) and is installed with a second large synchronous wheel (320); the first small synchronous wheel (319) and the second large synchronous wheel (320) are connected by a synchronous belt (321); a third shaft seat (308) is installed on the outer side of the other end of the second rotating arm housing (307); the second rotating shaft (310) passes through the third shaft seat (308), and the second rotating shaft (310) and the third shaft seat (308) are connected by a bearing.

9. The bagging, self-sealing and palletizing integrated machine according to claim 1, characterized in that: The palletizer (4) comprises a frame (401), a third rotating shaft (402) is symmetrically mounted on a material discharge port on the top side of the frame (401), and a material discharge plate (403) is mounted on the third rotating shaft (402).

10. The bagging, self-sealing and palletizing integrated machine according to claim 9, characterized in that: A third pneumatic cylinder (404) is vertically installed in the frame (401), and a U-shaped lifting seat (405) is installed at the top telescopic end of the third pneumatic cylinder (404). Two first connecting rods (406) arranged in a V shape are rotatably installed in the lifting seat (405), and the top ends of the two first connecting rods (406) are respectively rotatably connected to one end of the third connecting rod (408), and the other end of the third connecting rod (408) is rotatably connected to the bottom end of the fourth connecting rod (409), and the top end of the fourth connecting rod (409) is connected to the third rotating shaft (402), and the middle parts of the two first connecting rods (406) are respectively rotatably connected to the bottom ends of the second connecting rods (407), and the top ends of the two second connecting rods (407) are respectively rotatably connected to the middle part of the frame (401).