CN114537810A

CN114537810A - Quilt folding machine

Info

Publication number: CN114537810A
Application number: CN202210174932.2A
Authority: CN
Inventors: 陈媛媛
Original assignee: Individual
Current assignee: Taizhou Luqiao Jiangnan Internal Combustion Engine Parts Factory
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2022-05-27
Anticipated expiration: 2042-02-24
Also published as: CN114537810B

Abstract

The invention discloses a quilt folding machine, which comprises a workbench, wherein the lower end of the workbench is symmetrically provided with supporting bases for supporting, a fixed back plate is arranged on the workbench, and the lower end of the workbench is provided with a connecting plate; further comprising: the guide plate is arranged at the upper end of the first electric telescopic rod and is of a square plate-shaped structure; the first sliding block is in sliding connection with the fixed back plate through a groove formed in the fixed back plate. This quilt folding machine, through the rotation of first conveyer belt and second conveyer belt to the quilt pay-off, the rotation through rotating the screw rod realizes changing the position of first slider, the realization changes the position of first movable plate, can carry out the pay-off to the quilt of different thickness, realize twining the rolling to the quilt through the dead lever and the carriage release lever that set up on the drive plate, and through pressing the clamp plate not only can effectually avoid the in-process quilt of bagging-off the loose condition can also be convenient for more overlap the quilt after folding.

Description

Quilt folding machine

Technical Field

The invention relates to the technical field of quilt folding machines, in particular to a quilt folding machine.

Background

The quilt is a common bedding, mainly has the function of keeping warm for a human body when a user sleeps, is made of cotton or cotton wool wrapped by a quilt cover, can be produced by an automatic machine along with the development of science and technology, and is then wrapped after being folded manually.

The publication number is: CN 213921809U's simple and easy type quilt folding device, including the support that is cuboid frame form, be equipped with the dead lever that fixes and be square shape on it on the support, the dead lever is located the left side of support top center department, dead lever right side limit cover is equipped with three folding returning face plate pivot, three folding returning face plate pivot is articulated with the left side limit of three folding returning face plate, three folding returning face plate also is square shape and is located the right side of support top center department, the tip of three folding returning face plate pivot is connected with three folding pivot positive and negative motor through belt and belt pulley, three folding pivot positive and negative motor are located on the support, and are located the below of three folding returning face plate, drive three returning face plates through setting up positive and negative motor again, have realized that the quilt machinery is automatic folding, and the device simple structure, area is little, easily makes and low in manufacturing cost, is particularly useful for small-size enterprise, Hotel and hospital use; still set up the movable expansion board that can change the area size on the returning face plate, be applicable to not unidimensional quilt, the practicality is good, is worth extensively promoting, all is equipped with supplementary lug on the returning face plate, avoids the quilt to restore to the throne along with the returning face plate, guarantees that the quilt breaks away from the returning face plate smoothly and folds, improves folding efficiency.

However, the above-mentioned device also has some problems in the process of using, for example, the above-mentioned device can only be folded to less quilts, that is, the above-mentioned device work efficiency is lower, so that it can't fold the mass production quilts, so that the production efficiency is affected, and the above-mentioned device folds the quilt into square, in the process of subsequent packing, it needs to be manually inserted into the packing bag, so it is very time-consuming and labor-consuming, and in the process of inserting the packing bag, the quilt is easy to be loose, so it needs to be folded again, so it is very inconvenient, and in order to solve the above-mentioned problems, it is urgently needed to be innovated and designed on the basis of the original quilt folding machine.

Disclosure of Invention

The invention aims to provide a quilt folding machine to solve the problem that quilts produced in batches cannot be folded and need to be manually stuffed into a packing bag in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the quilt folding machine comprises a workbench, wherein support bases for supporting are symmetrically arranged at the lower end of the workbench, a fixed back plate is arranged on the workbench, a connecting plate is arranged at the lower end of the workbench, and 2 first electric telescopic rods are symmetrically arranged on the connecting plate;

further comprising:

the guide plate is arranged at the upper end of the first electric telescopic rod and is of a square plate-shaped structure;

the first sliding block is in sliding connection with the fixed back plate through a groove formed in the fixed back plate, and the fixed back plate is composed of an n-shaped plate-shaped structure and an inverted L-shaped plate-shaped structure;

the upper end of the first moving plate is symmetrically provided with first sliding blocks, the first moving plate is connected with rotating wheels on the belt pulley set through threaded rotating shafts, the belt pulley set is composed of 2 rotating wheels and a belt, and meanwhile, the other rotating wheel on the belt pulley set is connected with a rotating screw;

the first motor is arranged in a groove formed in the fixed back plate;

a second motor disposed on the first moving plate;

a third motor disposed on the plate-like structure mounted on the stationary backplate;

the third electric telescopic rod is mutually connected with the fixed back plate, a first fixed plate is arranged at the lower end of the third electric telescopic rod, and fixed sleeves are symmetrically arranged at the lower end of the first fixed plate;

the damping spring is arranged inside the fixed sleeve and is mutually connected with the connecting rod, the connecting rod and the fixed sleeve form sliding connection, and a second fixed plate is arranged at the lower end of the connecting rod;

and the fourth motor is arranged on the fixed back plate, the output end of the fourth motor is connected with the third rotating shaft, and the third rotating shaft and the fixed back plate form a rotating mechanism through a bearing arranged on the fixed back plate.

Preferably, rotate and install on the screw rod and rotate the wheel, just rotate the screw rod and pass through the bearing of installation on the fixed backplate with fixed backplate constitutes slewing mechanism, and rotate the screw rod through the tapped hole of seting up on the first slider with first slider interconnect, simultaneously rotate the screw rod with the output interconnect of first motor, through above-mentioned structure, be convenient for not influence the rotation of rotating the screw rod when supporting rotating the screw rod, and along with rotating the rotation of screw rod, realize changing from top to bottom the position of first slider.

Preferably, the rotating wheel is meshed with the positioning plate through a wheel tooth structure arranged on the positioning plate, a second electric telescopic rod is installed on the positioning plate, the second electric telescopic rod is installed on the fixed back plate, and the rotating wheel is meshed and limited through the positioning plate.

Preferably, the second slider is installed at the lower end of the positioning plate, the outer surface of the second slider is smooth, the second slider is in sliding connection with the fixed back plate through the groove formed in the fixed back plate, and the movement range of the positioning plate is limited through the second slider.

Preferably, a first rotating shaft is installed at an output end of the second motor, a first conveying belt is installed on the first rotating shaft, the first rotating shaft and the first moving plate form a rotating mechanism through a bearing installed on the first moving plate, and the first rotating shaft is installed on the second moving plate.

Preferably, a second rotating shaft is installed at the output end of the third motor, a second conveying belt is installed on the second rotating shaft, the second rotating shaft passes through a bearing installed on the fixed back plate and forms a rotating mechanism with the fixed back plate, and meanwhile the outer surfaces of the second conveying belt and the first conveying belt are both set to be fog surfaces.

Preferably, the connecting rod is symmetrically provided with a bearing slider, the outer surface of the bearing slider is smooth, the bearing slider is in sliding connection with the fixed sleeve through a groove formed in the fixed sleeve, the connecting rod is connected with the pressing plate through a second fixed plate, the pressing plate is in an arc-shaped plate structure, and the folded quilt is pressed and fixed through the pressing plate.

Preferably, the third axis of rotation is last to install the action wheel, just the action wheel is connected with the meshing of drive board through the teeth of a cogwheel structure that sets up on the drive board, through above-mentioned structure, is convenient for through the rotation of action wheel, drives the drive board and rotates.

Preferably, the driving plate further includes:

the fixed rod is arranged on the driving plate, and the outer surface of the fixed rod is smooth;

the movable rod is in sliding connection with the driving plate;

the fourth electric telescopic rod is arranged on the driving plate and is mutually connected with the movable rod;

and the limiting rod is arranged on the moving rod and is in sliding connection with the driving plate.

Compared with the prior art, the invention has the beneficial effects that:

(1) the quilt folding machine is provided with the first conveying belt and the second conveying belt, the processed quilts placed in the machine can be fed through the rotation of the first conveying belt and the second conveying belt, and the quilts are pressed in the feeding process, so that the quilts can be conveniently folded and rolled subsequently, and the folding effect can be effectively ensured;

(2) the quilt folding machine is provided with the first sliding block, the first moving plate and the rotating screw rod, the position of the first sliding block is changed up and down through the rotation of the rotating screw rod, and the position of the first moving plate can be changed at the moment, so that quilts with different thicknesses can be fed, the using range of the device is wider, the feeding effect can be effectively ensured, and the mechanical fault caused by the fact that the quilts are clamped between the first conveying belt and the second conveying belt due to the fact that the quilts are thick is avoided;

(3) this folding machine is provided with the driving plate and presses the clamp plate, through the rotation of driving the clamp plate to realize twining the rolling to the quilt through the dead lever that sets up on the driving plate and carriage release lever, and press the quilt through pressing the clamp plate after the rolling, and through pressing the clamp plate not only can effectually avoid the in-process quilt of bagging-off the loose condition can also be convenient for more overlap the quilt after the fifty percent discount and bag.

Drawings

FIG. 1 is a schematic front sectional view of a guide plate according to the present invention;

FIG. 2 is a schematic front sectional view of a first movable plate according to the present invention;

FIG. 3 is a rear view cross-sectional schematic view of the driving plate according to the present invention;

FIG. 4 is a schematic side sectional view of a first conveyor belt according to the present invention;

FIG. 5 is a side cross-sectional view of the travel bar of the present invention;

FIG. 6 is a schematic side sectional view of the pressing plate according to the present invention;

FIG. 7 is an enlarged view of the structure at A in FIG. 1 according to the present invention;

FIG. 8 is an enlarged view of the structure at B in FIG. 2 according to the present invention;

FIG. 9 is a perspective view of the pressing plate according to the present invention.

In the figure: 1. a work table; 2. a support base; 3. fixing the back plate; 4. a connecting plate; 5. a first electric telescopic rod; 6. a guide plate; 7. a first slider; 8. a first moving plate; 9. a pulley set; 10. rotating the screw; 11. a rotating wheel; 12. positioning a plate; 13. a second electric telescopic rod; 14. a second slider; 15. a first motor; 16. a second motor; 17. a first rotating shaft; 18. a first conveyor belt; 19. a second moving plate; 20. a third motor; 21. a second rotating shaft; 22. a second conveyor belt; 23. a third electric telescopic rod; 24. a first fixing plate; 25. fixing the sleeve; 26. a damping spring; 27. a connecting rod; 28. carrying the sliding block; 29. a second fixing plate; 30. a pressing plate; 31. a fourth motor; 32. a third rotating shaft; 33. a driving wheel; 34. driving the plate; 3401. fixing the rod; 3402. a travel bar; 3403. a fourth electric telescopic rod; 3404. a limiting rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-9, the present invention provides the following technical solutions: the quilt folding machine comprises a workbench 1, wherein support bases 2 for supporting are symmetrically arranged at the lower end of the workbench 1, a fixed back plate 3 is arranged on the workbench 1, a connecting plate 4 is arranged at the lower end of the

workbench

1, and 2 first electric telescopic rods 5 are symmetrically arranged on the connecting plate 4;

further comprising:

the guide plate 6 is arranged at the upper end of the first electric telescopic rod 5, and the guide plate 6 is of a square plate-shaped structure;

the first sliding block 7 is in sliding connection with the fixed back plate 3 through a groove formed in the fixed back plate 3, and the fixed back plate 3 consists of an n-shaped plate-shaped structure and an inverted L-shaped plate-shaped structure;

the upper end of the first moving plate 8 is symmetrically provided with first sliding blocks 7, the first moving plate 8 is connected with rotating wheels on the belt pulley set 9 through threaded rotating shafts, the belt pulley set 9 is composed of 2 rotating wheels and a belt, and meanwhile, the other rotating wheel on the belt pulley set 9 is connected with a rotating screw 10;

the first motor 15 is arranged in a groove formed in the fixed back plate 3;

a second motor 16 provided on the first moving plate 8;

a third motor 20 provided on a plate-like structure mounted on the stationary backplate 3;

the third electric telescopic rod 23 is connected with the fixed back plate 3, a first fixed plate 24 is arranged at the lower end of the third electric telescopic rod 23, and fixed sleeves 25 are symmetrically arranged at the lower end of the first fixed plate 24;

a damping spring 26 installed inside the fixing sleeve 25, wherein the damping spring 26 and the connecting rod 27 are connected with each other, the connecting rod 27 and the fixing sleeve 25 form a sliding connection, and a second fixing plate 29 is installed at the lower end of the connecting rod 27;

a fourth motor 31 disposed on the fixed backplate 3, wherein an output end of the fourth motor 31 is connected to a third rotating shaft 32, and the third rotating shaft 32 forms a rotating mechanism with the fixed backplate 3 through a bearing mounted on the fixed backplate 3;

in this example, the rotating wheel 11 is installed on the rotating screw 10, the rotating screw 10 forms a rotating mechanism with the fixed back plate 3 through a bearing installed on the fixed back plate 3, the rotating screw 10 is connected with the first slider 7 through a threaded hole formed in the first slider 7, and meanwhile, the rotating screw 10 is connected with the output end of the first motor 15; the rotating wheel 11 is engaged with the positioning plate 12 through a wheel tooth structure arranged on the positioning plate 12, a second electric telescopic rod 13 is arranged on the positioning plate 12, and the second electric telescopic rod 13 is arranged on the fixed back plate 3; the lower end of the positioning plate 12 is provided with a second sliding block 14, the outer surface of the second sliding block 14 is smooth, and the second sliding block 14 is in sliding connection with the fixed back plate 3 through a groove formed in the fixed back plate 3; a first rotating shaft 17 is mounted at the output end of the second motor 16, a first conveyor belt 18 is mounted on the first rotating shaft 17, the first rotating shaft 17 and the first moving plate 8 form a rotating mechanism through a bearing mounted on the first moving plate 8, and the first rotating shaft 17 is mounted on a second moving plate 19; a second rotating shaft 21 is installed at the output end of the third motor 20, a second conveyor belt 22 is installed on the second rotating shaft 21, the second rotating shaft 21 and the fixed back plate 3 form a rotating mechanism through a bearing installed on the fixed back plate 3, and meanwhile, the outer surfaces of the second conveyor belt 22 and the first conveyor belt 18 are both set to be fog surfaces;

when a quilt with different thicknesses needs to be folded, the second electric telescopic rod 13 in fig. 8 starts to work, because the positioning plate 12 is installed on the second electric telescopic rod 13, at this time, the second electric telescopic rod starts to move in the direction away from the rotating wheel 11 under the action of the second sliding block 14 until the positioning plate 12 is not meshed with the rotating wheel 11, then the first motor 15 starts to work, because the output end of the first motor 15 is provided with the rotating screw 10, the rotating screw 10 starts to rotate, because the belt pulley set 9 installed on the rotating screw 10 is connected with the threaded hole formed in the first sliding block 7 through the threaded structure arranged at the upper end of the rotating screw 10, the first sliding block 7 starts to move up and down along with the rotation of the rotating screw 10, and because the first sliding block 7 of the moving plate is connected with the first sliding block 8, at this time, the first moving plate 8 starts to move up and down, at this time, the distance between the first conveyor belt 18 and the second conveyor belt 22 arranged on the first moving plate 8 starts to be changed, so that the quilts with different thicknesses can be fed, that is, the second motor 16 and the third motor 20 in fig. 4 both start to work, that is, the first rotating shaft 17, the first conveyor belt 18, the second rotating shaft 21 and the second conveyor belt 22 are respectively driven to rotate (the first conveyor belt 18 and the second conveyor belt 22 are driven to reversely rotate, that is, the first conveyor belt 18 rotates counterclockwise, and the second conveyor belt 22 rotates clockwise), and at this time, the quilts are fed;

the connecting rod 27 is symmetrically provided with the bearing sliding blocks 28, the outer surfaces of the bearing sliding blocks 28 are smooth, the bearing sliding blocks 28 are in sliding connection with the fixed sleeve 25 through grooves formed in the fixed sleeve 25, the connecting rod 27 is mutually connected with the pressing plate 30 through the second fixed plate 29, and the pressing plate 30 is in an arc-shaped plate structure; a driving wheel 33 is arranged on the third rotating shaft 32, and the driving wheel 33 is meshed with the driving plate 34 through a gear tooth structure arranged on the driving plate 34; the driving plate 34 is also provided with: a fixing rod 3401 installed on the driving plate 34, and an outer surface of the fixing rod 3401 is set to be smooth; a movable rod 3402 which is connected with the driving plate 34 in a sliding way; a fourth electric telescopic bar 3403 installed on the driving plate 34, and the fourth electric telescopic bar 3403 and the moving bar 3402 are connected to each other; the limiting rod 3404 is arranged on the movable rod 3402, and the limiting rod 3404 is in sliding connection with the driving plate 34;

when the quilt needs to be folded, the quilt is fed through the first conveyor belt 18 and the second conveyor belt 22, then the quilt is attached to the fixed rod 3401 and the movable rod 3402 through the guide plate 6 in fig. 1 (the quilt is attached to the upper end of the fixed rod 3401 and the lower end of the movable rod 3402), the quilt is clamped at this time, then the fourth motor 31 in fig. 6 starts to work, the output end of the fourth motor 31 is connected with the third rotating shaft 32, the quilt starts to rotate at this time, the driving wheel 33 is installed on the third rotating shaft 32, the driving wheel 33 starts to rotate at this time, namely, the driving plate 34 meshed and connected with the driving wheel 33 starts to rotate under the action of the 4 'T' -shaped sliding blocks arranged at equal angles outside the driving plate 34 in fig. 3, and the fixed rod 3401 and the movable rod 3402 installed on the driving plate 34 start to rotate at this time, therefore, the quilt is driven to rotate, the quilt is rolled and folded, after the folding is completed, the fourth motor 31 in fig. 6 stops working, meanwhile, the third electric telescopic rod 23 starts working by combining fig. 1 and fig. 7, the third electric telescopic rod 23 drives the first fixing plate 24, the fixing sleeve 25, the damping spring 26, the connecting rod 27, the receiving sliding block 28, the second fixing plate 29 and the pressing plate 30 to move downwards until the lower end of the pressing plate 30 is tightly attached to the quilt, the quilt is pressed and fixed through the pressing plate 30 at the moment, the loose condition of the quilt can be effectively avoided, then the packing bag is sleeved outside the pressing plate 30 (the lower end of the packing bag is attached to the quilt, and the upper end of the packing bag is attached to the pressing plate 30), and then the bag packing of the folded quilt can be rapidly realized.

The working principle is as follows: when the device needs to be used, a quilt is placed between the first conveyor belt 18 and the second conveyor belt 22 in fig. 1, then the second motor 16 and the third motor 20 in fig. 4 are started to work, at this time, the first conveyor belt 18 and the second conveyor belt 22 are driven to rotate, so that the quilt is fed until the quilt enters between the fixed rod 3401 and the movable rod 3402, then the fourth motor 31 in fig. 6 is started to work, at this time, the third rotating shaft 32, the driving wheel 33 and the driving plate 34 all start to rotate, at this time, the fixed rod 3401 and the movable rod 3402 mounted on the driving plate 34 start to rotate, so that the quilt is wound and folded, at this time, the third electric telescopic rod 23 in fig. 7 drives the first fixed plate 24, the fixed sleeve 25, the connecting rod 27 and the second fixed plate 29 to move downwards, at this time, the pressing plate 30 in fig. 1 also starts to move downwards, until the pressing plate 30 is tightly attached to the quilt, and finally the quilt is sleeved with a packaging bag, which is the working principle of the quilt folding machine.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The quilt folding machine comprises a workbench (1), wherein supporting bases (2) for supporting are symmetrically arranged at the lower end of the workbench (1), a fixed back plate (3) is installed on the workbench (1), a connecting plate (4) is installed at the lower end of the workbench (1), and 2 first electric telescopic rods (5) are symmetrically arranged on the connecting plate (4);

it is characterized by also comprising:

the guide plate (6) is installed at the upper end of the first electric telescopic rod (5), and the guide plate (6) is of a square plate-shaped structure;

the first sliding block (7) is in sliding connection with the fixed back plate (3) through a groove formed in the fixed back plate (3), and the fixed back plate (3) is composed of an n-shaped plate structure and an inverted L-shaped plate structure;

the upper end of the first moving plate (8) is symmetrically provided with first sliding blocks (7), the first moving plate (8) is connected with rotating wheels on the belt pulley set (9) through threaded rotating shafts, the belt pulley set (9) is composed of 2 rotating wheels and a belt, and meanwhile, the other rotating wheel on the belt pulley set (9) is connected with a rotating screw (10);

the first motor (15) is arranged in a groove formed in the fixed back plate (3);

a second motor (16) provided on the first moving plate (8);

a third motor (20) arranged on a plate-like structure mounted on the stationary backplate (3);

the third electric telescopic rod (23) is connected with the fixed back plate (3), a first fixed plate (24) is arranged at the lower end of the third electric telescopic rod (23), and fixed sleeves (25) are symmetrically arranged at the lower end of the first fixed plate (24);

the damping spring (26) is installed inside the fixed sleeve (25), the damping spring (26) and the connecting rod (27) are connected with each other, the connecting rod (27) and the fixed sleeve (25) are in sliding connection, and the lower end of the connecting rod (27) is provided with a second fixed plate (29);

the fourth motor (31) is arranged on the fixed back plate (3), the output end of the fourth motor (31) is connected with the third rotating shaft (32), and the third rotating shaft (32) and the fixed back plate (3) form a rotating mechanism through a bearing arranged on the fixed back plate (3).

2. A quilt folder as defined in claim 1, wherein: the rotating mechanism is characterized in that a rotating wheel (11) is mounted on the rotating screw rod (10), the rotating screw rod (10) and the fixed back plate (3) form a rotating mechanism through a bearing mounted on the fixed back plate (3), the rotating screw rod (10) is connected with the first sliding block (7) through a threaded hole formed in the first sliding block (7), and meanwhile the rotating screw rod (10) is connected with the output end of the first motor (15).

3. A quilt folder as defined in claim 2, wherein: the rotating wheel (11) is meshed with the positioning plate (12) through a wheel tooth structure arranged on the positioning plate (12), a second electric telescopic rod (13) is installed on the positioning plate (12), and the second electric telescopic rod (13) is installed on the fixed back plate (3).

4. A quilt folder as defined in claim 3, wherein: a second sliding block (14) is mounted at the lower end of the positioning plate (12), the outer surface of the second sliding block (14) is smooth, and the second sliding block (14) is in sliding connection with the fixed back plate (3) through a groove formed in the fixed back plate (3).

5. A quilt folder as defined in claim 1, wherein: the output end of the second motor (16) is provided with a first rotating shaft (17), the first rotating shaft (17) is provided with a first conveying belt (18), the first rotating shaft (17) and the first moving plate (8) form a rotating mechanism through a bearing arranged on the first moving plate (8), and meanwhile the first rotating shaft (17) is arranged on a second moving plate (19).

6. A quilt folder as claimed in claim 5, wherein: a second rotating shaft (21) is installed at the output end of the third motor (20), a second conveying belt (22) is installed on the second rotating shaft (21), the second rotating shaft (21) and the fixed back plate (3) form a rotating mechanism through a bearing installed on the fixed back plate (3), and meanwhile the outer surfaces of the second conveying belt (22) and the first conveying belt (18) are both set to be fog surfaces.

7. A quilt folder as defined in claim 1, wherein: the connecting rod (27) is symmetrically provided with bearing sliding blocks (28), the outer surfaces of the bearing sliding blocks (28) are smooth, the bearing sliding blocks (28) are in sliding connection with the fixed sleeve (25) through grooves formed in the fixed sleeve (25), the connecting rod (27) is connected with the pressing plate (30) through a second fixed plate (29), and the pressing plate (30) is of an arc-shaped plate structure.

8. A folding machine according to claim 1, characterized in that: and a driving wheel (33) is installed on the third rotating shaft (32), and the driving wheel (33) is meshed and connected with the driving plate (34) through a gear tooth structure arranged on the driving plate (34).

9. A quilt folder as defined in claim 8, wherein: the driving plate (34) is further provided with:

a fixing bar (3401) installed on the driving plate (34), and an outer surface of the fixing bar (3401) is smooth;

a travel bar (3402) slidably connected to the driving plate (34);

a fourth electric telescopic link (3403) installed on the driving plate (34), the fourth electric telescopic link (3403) and the moving bar (3402) being connected to each other;

the limiting rod (3404) is installed on the moving rod (3402), and the limiting rod (3404) is in sliding connection with the driving plate (34).