CN217024606U

CN217024606U - Printing paper feeding device

Info

Publication number: CN217024606U
Application number: CN202220505454.4U
Authority: CN
Inventors: 阮燕春; 黄建强
Original assignee: Hunan Wenrui Education Printing Co ltd
Current assignee: Hunan Wenrui Education Printing Co ltd
Priority date: 2022-03-10
Filing date: 2022-03-10
Publication date: 2022-07-22
Anticipated expiration: 2032-03-10

Abstract

The utility model discloses a printing paper feeding device, relates to the technical field of printing, and aims to solve the problems that the existing printing equipment feeding device cannot supplement paper during working and is low in working efficiency. The paper adding device is novel in structure, paper can be added to the device in the working process through the matching of the bearing mechanism and the lifting device, the paper adding is not required to be stopped, the working efficiency is improved, and the practicability of the device is improved.

Description

Printing paper loading attachment

Technical Field

The utility model relates to the technical field of printing, in particular to a printing paper feeding device.

Background

Printing is a technique of transferring ink to the surface of a material such as paper, fabric, or leather by plate making, inking, and pressing an original such as a character, a picture, or a photograph, and thereby mass-transferring the content of the original.

In the traditional paper printing process, a printing machine is often used for printing the surface of paper, paper printing equipment usually transports the paper through a feeding device, but the feeding device of the existing printing equipment cannot supplement the paper during working, and the working efficiency is low. Therefore, in order to solve the above problems, we propose a printing sheet feeding device.

SUMMERY OF THE UTILITY MODEL

The printing paper feeding device provided by the utility model solves the problems that the existing printing equipment feeding device cannot supplement paper during working and the working efficiency is low.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a printing paper feeding device comprises a workbench and a support plate, wherein a printing plate is fixedly mounted at the top end of the workbench, a support plate is fixedly mounted on one side of the workbench, a controller is fixedly mounted on one side of the support plate, a mounting box is fixedly mounted at the top end of the support plate, a support block is slidably mounted in the mounting box and is in a convex shape, the support block penetrates through the mounting box in a sliding manner and is close to one side of the workbench, a driving device is arranged on the side wall of the support block, the support plate is fixedly mounted at one end of the support block penetrating through the mounting box, a first air cylinder is fixedly mounted at the top end of the support plate, a first air cylinder piston rod penetrates through the support plate in a sliding manner, a lifting plate is fixedly mounted at one end of the first air cylinder piston rod penetrating through the support plate, an adsorption device is arranged between the support plate and the lifting plate, a pressing structure is arranged on one side of the support plate, and a base is fixedly mounted on one side of the workbench, and a groove is formed in the top end of the base, a lifting device is arranged in the groove, a containing groove is formed in one side, close to the base, of the workbench, and a bearing mechanism is arranged in the containing groove.

Through the scheme, when the equipment is used, a worker places paper on the top end of the lifting device, the height of the paper is adjusted through the lifting device, subsequent feeding of the equipment is facilitated, after the paper is placed, the supporting block is driven by the driving device to slide in the mounting box, the supporting block drives the supporting plate to move towards the top end of the base, when the supporting plate is located at the top end of the base, the lifting plate is driven by the first air cylinder to descend, the paper is adsorbed by the adsorption device, the effect of clamping the paper is achieved, subsequent paper transportation of the equipment is facilitated, after the paper is adsorbed by the adsorption device, the supporting block is driven by the driving device to drive the supporting plate to move towards the direction away from the base, the paper is placed at the top end of the printing plate, the lifting plate is driven by the first air cylinder to descend, the paper is placed at the top end of the printing plate, and after the paper is placed at the top end of the printing plate, the paper is rolled and pressed by the pressing structure, play the effect of leveling the paper, improved the printing quality of product, and this equipment passes through elevating gear and receiving mechanism's cooperation, makes equipment can add the paper at the printing in-process, has improved work efficiency.

Preferably, drive arrangement includes threaded rod, protection box and gear motor, the threaded rod is installed to the mounting box internal rotation, just the mounting box is close to base one side fixed mounting and has the protection box, fixed mounting has gear motor in the protection box, just the threaded rod runs through the supporting shoe near protection box one end screw thread, the threaded rod is close to gear motor one end and runs through the protection box, just the threaded rod runs through protection box one end and gear motor output shaft tip fixed connection.

Through foretell scheme, when equipment uses, rotate through gear motor drive threaded rod, threaded rod drive supporting shoe slides in the mounting box, makes supporting shoe drive extension board and lifter plate remove, the equipment transportation paper of being convenient for.

Preferably, adsorption equipment includes aspirator pump, air duct, connecting pipe and sucking disc, extension board top fixed mounting have the aspirator pump, just the equal fixed mounting in four corners in lifter plate top has the connecting pipe, the lifter plate all runs through in the connecting pipe bottom, just the connecting pipe runs through the equal fixed mounting in lifter plate one end and has the sucking disc, be equipped with between the one side that connecting pipe top and aspirator pump are relative and be connected with the air duct, just the air duct is close to and all is flexible form with one section of group's connecting pipe.

Through foretell scheme, after the extension board is located the base top, descend through first cylinder drive lifter plate, make the lifter plate take the sucking disc to descend, make sucking disc and paper contact, after the sucking disc contacts with the paper, through the cooperation of aspirator pump, air duct, connecting pipe and sucking disc, reach the effect of adsorbing the paper, and the connecting pipe hypomere all is flexible form, and the lifter plate of being convenient for descends.

Preferably, four second cylinders that are the symmetric distribution are installed on the lifter plate top, just the equal slip of second cylinder piston rod runs through the lifter plate, second cylinder piston rod runs through one section equal fixed mounting of lifter plate and has the rubber pad.

Through foretell scheme, after the sucking disc firmly the paper, through second cylinder drive with the group rubber pad activity from top to bottom, make the rubber pad act on the paper, reach the effect of patting the paper, help avoiding adsorption equipment to adsorb two papers, improved work efficiency.

Preferably, press the structure and include mounting panel, an electric telescopic handle, installing frame and press roll, the lifter plate is kept away from the equal fixed mounting in base one side and is two mounting panels that are the symmetric distribution, and two the mounting panel all is the L type, two the equal fixed mounting in mounting panel horizontal segment bottom has an electric telescopic handle, and two electric telescopic handle bottoms all with installing frame top fixed connection, the press roll is installed to the installing frame internal rotation.

Through foretell scheme, after adsorption equipment adsorbs the paper, it rises to cross adsorption equipment and paper through first cylinder drive extension board, it removes to be located the mounting box through drive arrangement drive supporting shoe, make the paper be located the printing plate top, descend through first cylinder drive lifter plate, make the paper arrange the printing plate top in, at this moment, descend through first electric telescopic handle drive mounting frame and press roller, make press roller and printing plate top contact, rethread drive supporting shoe takes the lifter plate to remove to the base direction, make the lifter plate drive press the roller to be located the rolling of printing plate top, reach the effect of leveling the paper, the printing quality of product has been improved.

Preferably, the lifting device comprises a third cylinder, a fixing plate and a placing plate, the third cylinder is fixedly mounted on the inner wall of the bottom end of the groove, the fixing plate is fixedly mounted at the top end of a piston rod of the third cylinder, and the placing plate is placed at the top end of the fixing plate.

Through foretell scheme, before the equipment uses, the staff will place the board and place the fixed plate top in, and the staff places the paper in again and places the board top, places the completion back when the paper, and the staff starts third cylinder drive fixed plate area through the controller and places the board and rise, and the equipment transportation material loading of being convenient for has improved the practicality of equipment.

Preferably, the supporting mechanism includes second electric telescopic handle, catch bar, bearing plate and infrared sensor, it has second electric telescopic handle to accomodate the groove and keep away from base one side inner wall fixed mounting, just it has the catch bar to accomodate inslot slidable mounting, base one side and second electric telescopic rod tip fixed connection are kept away from to the catch bar, just the catch bar is close to base one side fixed mounting has the bearing plate that is sharp distribution, place the board top and seted up with bearing plate assorted slot, just the workstation is close to base one side fixed mounting and has infrared sensor.

Through the scheme, when printed paper needs to be replenished, the placing plate is detected through the infrared sensor, the second electric telescopic rod drives the pushing plate to be positioned in the accommodating groove to slide, the pushing plate drives the bearing plate to move towards the base direction, the bearing plate is driven to be positioned in the slot formed in the top end of the placing plate, the third air cylinder can be controlled to drive the fixing plate to drive the placing plate to descend, so that a worker can place the paper on the placing plate again, the bearing plates are matched to play a role in supporting residual paper, after the paper is replenished, the fixing plate is driven to ascend through the third air cylinder to drive the replenished paper to be contacted with the bottom end of the residual paper, and then the second electric telescopic rod drives the pushing plate to drive the bearing plate to move towards the accommodating groove, so that the replenished paper and the original paper are stacked, the effect of replenishing the paper can be achieved, and the replenishment is not required, the working efficiency is improved, and the practicability of the equipment is improved.

Preferably, the equal fixed mounting in slurcam both sides has the stopper, just accomodate groove both sides inner wall and all seted up with the homonymy stopper assorted spacing groove.

Through foretell scheme, when the catch bar was located to accomodate the inslot and slides, the catch bar area both sides stopper was located homonymy spacing inslot and slides, has improved the gliding stability of catch bar.

The beneficial effects of the utility model are as follows:

1. through elevating gear's setting, it rises to place the board through the drive of third cylinder, the equipment material loading of being convenient for, when infrared sensor detects and places the board, setting through accepting the mechanism, remove to the base direction through second electric telescopic handle drive catch plate and bearing plate, make the bearing plate with place the slot block that the board top was seted up, can accept the paper of placing the board top and come, afterwards, make through elevating gear and place the board decline, the staff of being convenient for places the paper, cooperation through elevating gear and bearing mechanism, make equipment can add the paper in the course of the work, and the work efficiency is improved.

2. Through adsorption equipment's setting, through the cooperation of aspiration pump, air duct and sucking disc, can play the effect of adsorbing the paper, and pat the paper of adsorbing through the cooperation of second cylinder and rubber pad, help avoiding equipment to adsorb two or more paper, improved the practicality of equipment, and through the setting of pressing the structure, the paper is placed on the printing plate, rolls on the paper through pressing the compression roller once, can play the effect of leveling the paper, has improved the processingquality of product.

To sum up, this equipment novel structure through load-carrying members and elevating gear's cooperation, makes equipment also can add the paper in the course of the work, need not to shut down and adds, has improved work efficiency, and has improved the practicality of equipment.

Drawings

FIG. 1 is a schematic diagram of a first perspective of the present invention;

FIG. 2 is an enlarged view of A of FIG. 1 according to the present invention;

FIG. 3 is a schematic diagram of a second perspective of the present invention;

FIG. 4 is a cross-sectional top view of the present invention;

FIG. 5 is an exploded view of the driving device, the suction device and the pressing structure of the present invention;

fig. 6 is an exploded view of the lifting device of the present invention.

Reference numbers in the figures: 1. a work table; 2. a printing plate; 3. mounting a plate; 4. a support plate; 5. a gas-guide tube; 6. a getter pump; 7. a first cylinder; 8. a lifting plate; 9. a second cylinder; 10. a connecting pipe; 11. a suction cup; 12. a threaded rod; 13. mounting a box; 14. a protective case; 15. a support plate; 16. a controller; 17. a receiving groove; 18. a bearing plate; 19. placing the plate; 20. inserting slots; 21. a base; 22. a groove; 23. a third cylinder; 24. a fixing plate; 25. an infrared sensor; 26. a first electric telescopic rod; 27. installing a frame; 28. pressing the roller; 29. a supporting block; 30. a reduction motor; 31. a second electric telescopic rod; 32. a push plate; 33. limiting block

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.

Referring to fig. 1-4, the printing paper feeding device comprises a workbench 1 and a support plate 4, a printing plate 2 is fixedly installed at the top end of the workbench 1, a support plate 15 is fixedly installed at one side of the workbench 1, a controller 16 is fixedly installed at one side of the support plate 15, a mounting box 13 is fixedly installed at the top end of the support plate 15, a support block 29 is slidably installed in the mounting box 13, the support block 29 is in a convex shape, the support block 29 is slidably penetrated through the mounting box 13 at the side close to the workbench 1, a driving device is arranged on the side wall of the support block 29 and comprises a threaded rod 12, a protection box 14 and a speed reducing motor 30, the threaded rod 12 is rotatably installed in the mounting box 13, the protection box 14 is fixedly installed at the side close to a base 21 of the mounting box 13, the speed reducing motor 30 is fixedly installed in the protection box 14, one end of the threaded rod 12 close to the protection box 14 is penetrated through the support block 29, one end of the threaded rod 12 close to the speed reducing motor 30 is penetrated through the protection box 14, and the threaded rod 12 penetrates one end of the protection box 14 and is fixedly connected with the end part of the output shaft of the speed reducing motor 30, when the device is used, the threaded rod 12 is driven to rotate by the speed reducing motor 30, the threaded rod 12 drives the supporting block 29 to slide in the mounting box 13, the supporting block 29 is driven to drive the supporting plate 4 and the lifting plate 8 to move, and paper is convenient to transport by the device.

Referring to fig. 3-5, a support plate 4 is fixedly mounted at one end of a support block 29 penetrating through a mounting box 13, a first cylinder 7 is fixedly mounted at the top end of the support plate 4, a piston rod of the first cylinder 7 penetrates through the support plate 4 in a sliding manner, a lifting plate 8 is fixedly mounted at one end of the piston rod of the first cylinder 7 penetrating through the support plate 4 in a sliding manner, an adsorption device is arranged between the support plate 4 and the lifting plate 8 and comprises a getter pump 6, an air duct 5, a connecting pipe 10 and a suction cup 11, the getter pump 6 is fixedly mounted at the top end of the support plate 4, the connecting pipes 10 are fixedly mounted at four corners of the top end of the lifting plate 8, the lifting plate 8 is penetrated at the bottom end of the connecting pipe 10, the suction cup 11 is fixedly mounted at one end of the connecting pipe 10 penetrating through the lifting plate 8, an air duct 5 is arranged between the top end of the connecting pipe 10 and one side opposite to the getter pump 6, sections of the air duct 5 close to the connecting pipes 10 in the same group are all in a telescopic shape, when the support plate 4 is positioned at the top end of a base 21, through the 8 decline of 7 drive lifter plates of first cylinder, make lifter plates 8 take sucking disc 11 to descend, make sucking disc 11 and paper contact, after sucking disc 11 and paper contact, through aspirator pump 6, air duct 5, connecting pipe 10 and sucking disc 11's cooperation, reach the effect of adsorbing the paper, and the connecting pipe 10 hypomere all is flexible form, and the lifter plates 8 of being convenient for descend.

Referring to fig. 1, four second cylinders 9 that are the symmetric distribution are installed on 8 tops of lifter plate, and the equal slip of second cylinder 9 piston rod runs through lifter plate 8, and the equal fixed mounting of one section of second cylinder 9 piston rod runs through lifter plate 8 has the rubber pad, adsorbs the back when sucking disc 11 with the paper, through the upper and lower activity of the same group rubber pad of second cylinder 9 drive, makes the rubber pad be used in on the paper, reaches the effect of patting the paper, helps avoiding adsorption equipment to adsorb two papers, has improved work efficiency.

Referring to fig. 1-5, a pressing structure is arranged on one side of the support plate 4, the pressing structure includes a mounting plate 3, a first electric telescopic rod 26, a mounting frame 27 and a pressing roller 28, two symmetrically distributed mounting plates 3 are fixedly mounted on one side of the lifting plate 8 away from the base 21, the two mounting plates 3 are both L-shaped, a first electric telescopic rod 26 is fixedly mounted at the bottom end of the horizontal section of each of the two mounting plates 3, the bottom ends of the two first electric telescopic rods 26 are fixedly connected with the top end of the mounting frame 27, the pressing roller 28 is rotatably mounted in the mounting frame 27, after the paper is adsorbed by the adsorbing device, the support plate 4 is driven by the first air cylinder 7 to lift the adsorbing device and the paper, the support block 29 is driven by the driving device to move in the mounting box 13 to make the paper be located above the printing plate 2, the lifting plate 8 is driven by the first air cylinder 7 to descend to make the paper be located at the top end of the printing plate 2, at this time, the first electric telescopic rod 26 drives the mounting frame 27 and the pressing roller 28 to descend, so that the pressing roller 28 is contacted with the top end of the printing plate 2, the driving device drives the supporting block 29 to drive the lifting plate 8 to move towards the base 21, so that the lifting plate 8 drives the pressing roller 28 to be located at the top end of the printing plate 2 to roll, the effect of leveling paper is achieved, and the printing quality of a product is improved.

Referring to fig. 1 and 6, 1 one side fixed mounting of workstation has base 21, and the base 21 top has seted up recess 22, be equipped with elevating gear in the recess 22, elevating gear includes third cylinder 23, fixed plate 24 and places board 19, recess 22 bottom inner wall fixed mounting has third cylinder 23, and third cylinder 23 piston rod top fixed mounting has fixed plate 24, place board 19 has been placed on fixed plate 24 top, before the equipment use, the staff will place board 19 and place the 24 tops of fixed plate, the staff places the paper in and places board 19 top again, after the paper is placed and is accomplished, the staff starts third cylinder 23 drive fixed plate 24 through controller 16 and takes to place board 19 and rise, the transportation of equipment material loading of being convenient for, the practicality of equipment has been improved.

Referring to fig. 1 and 4, and workstation 1 is close to base 21 one side and is equipped with and accomodates groove 17, it is equipped with supporting mechanism in the groove 17 to accomodate, supporting mechanism includes second electric telescopic handle 31, push plate 32, bearing plate 18 and infrared sensor 25, it has second electric telescopic handle 31 to accomodate groove 17 and keep away from base 21 one side inner wall fixed mounting, and accomodate in-groove 17 slidable mounting have push plate 32, base 21 one side and second electric telescopic handle 31 tip fixed connection are kept away from to push plate 32, and push plate 32 is close to base 21 one side fixed mounting and has bearing plate 18 that is sharp distribution, place 19 tops of board and offer with bearing plate 18 assorted slot 20, and workstation 1 is close to base 21 one side fixed mounting has infrared sensor 25.

When the printed paper needs to be replenished, the placing plate 19 is detected by the infrared sensor 25, the pushing plate 32 is driven by the second electric telescopic rod 31 to be positioned in the accommodating groove 17 to slide, the pushing plate 32 is driven to drive the bearing plate 18 to move towards the base 21, the bearing plate 18 is driven to be positioned in the slot 20 formed in the top end of the placing plate 19, the third air cylinder 23 can be controlled to drive the fixing plate 24 to drive the placing plate 19 to descend, so that a worker can place the paper on the placing plate 19 again, the bearing plates 18 are matched to play a role in supporting the residual paper, after the replenishment of the paper is completed, the fixing plate 24 is driven to ascend by the third air cylinder 23 to drive the replenished paper to be contacted with the bottom end of the residual paper, and then the pushing plate 32 is driven by the second electric telescopic rod 31 to drive the bearing plate 18 to move towards the accommodating groove 17, so that the replenished paper is stacked with the original paper, can achieve the effect of paper supplementation without shutdown supplementation, improve the working efficiency and improve the practicability of equipment

The equal fixed mounting in slurcam 32 both sides has stopper 33, and accomodate groove 17 both sides inner wall and all seted up with homonymy stopper 33 assorted spacing groove, and slurcam 32 is located accomodates the inslot 17 when sliding, slurcam 32 takes stopper 33 of both sides to be located homonymy spacing inslot and slides, has improved the gliding stability of slurcam 32.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the utility model concepts of the present invention in the scope of the present invention.

Claims

1. The printing paper feeding device comprises a workbench (1) and a support plate (4) and is characterized in that a printing plate (2) is fixedly mounted at the top end of the workbench (1), a support plate (15) is fixedly mounted on one side of the workbench (1), a controller (16) is fixedly mounted on one side of the support plate (15), a mounting box (13) is fixedly mounted at the top end of the support plate (15), a support block (29) is slidably mounted in the mounting box (13), the support block (29) is in a convex shape, the support block (29) is slidably penetrated through the mounting box (13) on the side close to the workbench (1), a driving device is arranged on the side wall of the support block (29), the support plate (4) is fixedly mounted at one end of the support block (29) penetrating through the mounting box (13), a first air cylinder (7) is fixedly mounted at the top end of the support plate (4), a piston rod of the first air cylinder (7) slidably penetrates through the support plate (4), just first cylinder (7) piston rod slides and runs through extension board (4) one end fixed mounting has lifter plate (8), be equipped with adsorption equipment between extension board (4) and lifter plate (8), just extension board (4) one side is equipped with presses down the structure, workstation (1) one side fixed mounting has base (21), just base (21) top is seted up flutedly (22), be equipped with elevating gear in recess (22), just workstation (1) is close to base (21) one side and is equipped with and accomodates groove (17), be equipped with receiving mechanism in accomodating groove (17).

2. The printing paper feeding device according to claim 1, wherein the driving device comprises a threaded rod (12), a protection box (14) and a speed reducing motor (30), the threaded rod (12) is rotatably mounted in the mounting box (13), the protection box (14) is fixedly mounted on one side, close to the base (21), of the mounting box (13), the speed reducing motor (30) is fixedly mounted in the protection box (14), one end, close to the protection box (14), of the threaded rod (12) penetrates through the supporting block (29), one end, close to the speed reducing motor (30), of the threaded rod (12) penetrates through the protection box (14), and one end, close to the speed reducing motor (30), of the threaded rod (12) penetrates through the protection box (14) and is fixedly connected with the end of an output shaft of the speed reducing motor (30).

3. The printing paper feeding device according to claim 1, wherein the adsorption device comprises a getter pump (6), an air guide tube (5), a connecting tube (10) and a suction cup (11), the getter pump (6) is fixedly mounted at the top end of the support plate (4), the connecting tube (10) is fixedly mounted at four corners of the top end of the lifting plate (8), the bottom end of the connecting tube (10) penetrates through the lifting plate (8), the suction cup (11) is fixedly mounted at one end of the connecting tube (10) penetrating through the lifting plate (8), the air guide tube (5) is connected between the top end of the connecting tube (10) and the side opposite to the getter pump (6), and the air guide tube (5) is telescopic near the connecting tube (10) in the same group.

4. The printing paper feeding device according to claim 1, wherein four symmetrically distributed second cylinders (9) are installed at the top end of the lifting plate (8), piston rods of the second cylinders (9) penetrate through the lifting plate (8) in a sliding manner, and rubber pads are fixedly installed on sections of the piston rods of the second cylinders (9) penetrating through the lifting plate (8).

5. The printing paper feeding device according to claim 1, wherein the pressing structure comprises a mounting plate (3), a first electric telescopic rod (26), a mounting frame (27) and a pressing roller (28), two mounting plates (3) which are symmetrically distributed are fixedly mounted on one side, away from the base (21), of the lifting plate (8), two mounting plates (3) are L-shaped, two first electric telescopic rods (26) are fixedly mounted at the bottom ends of the horizontal sections of the two mounting plates (3), the bottom ends of the two first electric telescopic rods (26) are fixedly connected with the top end of the mounting frame (27), and the pressing roller (28) is rotatably mounted in the mounting frame (27).

6. The printing paper feeding device according to claim 1, wherein the lifting device comprises a third cylinder (23), a fixing plate (24) and a placing plate (19), the third cylinder (23) is fixedly mounted on the inner wall of the bottom end of the groove (22), the fixing plate (24) is fixedly mounted on the top end of a piston rod of the third cylinder (23), and the placing plate (19) is placed on the top end of the fixing plate (24).

7. Printing sheet feeding device according to claim 6, characterised in that the receiving means comprise a second electric telescopic rod (31), a push plate (32), a bearing plate (18) and an infrared sensor (25), a second electric telescopic rod (31) is fixedly arranged on the inner wall of one side of the accommodating groove (17) far away from the base (21), a pushing plate (32) is arranged in the accommodating groove (17) in a sliding manner, one side of the pushing plate (32) far away from the base (21) is fixedly connected with the end part of the second electric telescopic rod (31), and one side of the pushing plate (32) close to the base (21) is fixedly provided with a bearing plate (18) which is linearly distributed, the top end of the placing plate (19) is provided with a slot (20) matched with the bearing plate (18), and an infrared sensor (25) is fixedly arranged on one side of the workbench (1) close to the base (21).

8. The printing paper feeding device according to claim 7, wherein limiting blocks (33) are fixedly mounted on two sides of the pushing plate (32), and limiting grooves matched with the limiting blocks (33) on the same side are formed in inner walls of two sides of the accommodating groove (17).