Metal wire hot rolling equipment

Abstract

The utility model discloses hot rolling equipment for metal wires, which relates to the field of butt-welding machines and comprises a mounting cabinet and a mounting frame, the top end of the mounting cabinet is fixedly connected with a bottom frame, the upper end of the bottom frame is fixedly connected with a welding plate, the upper end of the welding plate is fixedly connected with a reset component, and the top end of the reset component is fixedly connected with a limiting plate. The reset assembly comprises a sleeve fixedly connected with the welding plate, the inner side surface of the sleeve is slidably connected with a sliding push head, the top end in the sliding push head is fixedly connected with a fixing piece, the fixing piece is connected with a limiting sliding plate through a first shock absorber, and the inner side surface of the fixing piece is fixedly connected with a limiting spring rod. And the other ends of the limiting spring rods are fixedly connected with Y-shaped frames, the inner side surfaces of the Y-shaped frames are rotationally connected with lateral rolling wheels, telescopic rods are fixedly connected between the opposite faces of the adjacent Y-shaped frames, and the problems that rolling position deviation occurs, parts are damaged due to vibration, and a welding head is difficult to replace rapidly are solved.

Description

Technical Field

[0001] The utility model relates to the field of rolling machines, in particular to a metal wire hot rolling device. Background Art

[0002] In the processing of metal wire, one end of the metal wire needs to be hot-rolled in a ring shape. Generally, butt welding is used during hot rolling. Butt welding uses the high-temperature arc generated when the positive and negative poles are short-circuited to melt the two materials to be welded, so that the two separated metal atoms are close to the lattice distance to form a metal bond, and a sufficient amount of common grains are generated on the bonding surface to obtain a weld, weld or butt joint. During the use of existing hot rolling equipment, the wire material and the terminal need to be rolled quickly and multiple times, which often leads to rolling position deviation and vibration damage to parts. At the same time, the welding head is often damaged first. It is difficult to quickly replace the welding head with existing hot rolling equipment, affecting the overall use effect. Utility Model Content

[0003] In order to solve the above technical problems, a metal wire hot rolling equipment is provided. This technical solution solves the problems of rolling position deviation, vibration damage to parts and difficulty in rapid replacement of welding heads raised in the above background technology.

[0004] In order to achieve the above purpose, the technical solution adopted by this utility model is:

[0005] A metal wire hot rolling equipment includes an installation cabinet and a mounting frame, wherein the top of the installation cabinet is fixedly connected to a base frame, the upper end of the base frame is fixedly connected to a welding plate, the upper end of the welding plate is fixedly connected to a reset assembly, and the top end of the reset assembly is fixedly connected to a limit plate;

[0006] The reset assembly includes a sleeve fixedly connected to the welding plate, the inner surface of the sleeve is slidably connected to a sliding push head, the inner top end of the sliding push head is fixedly connected to a fixing member, the bottom top end of the fixing member is fixedly connected to a first shock absorber, the other end of the first shock absorber is fixedly connected to a limiting slide, the outer surface of the limiting slide is slidably connected to the outer surface of the sliding push head and the inner surface of the sleeve respectively, the inner surface of the fixing member is fixedly connected to a limiting spring rod, the other end of the limiting spring rod is fixedly connected to a Y-shaped frame, the inner surface of the Y-shaped frame is rotatably connected to a lateral roller, a telescopic rod is fixedly connected between the opposite surfaces of adjacent Y-shaped frames, the bottom end of the fixing member is fixedly connected to a connecting spring, and the other end of the connecting spring is fixedly connected to the inner bottom end of the welding plate.

[0007] Preferably, the bottom end of the limit plate is fixedly connected to a cutting tool, the left bottom end of the limit plate is fixedly connected to a second shock absorber, the other end of the second shock absorber is fixedly connected to a conductive component, and the bottom end of the conductive component is fixedly connected to a welding head.

[0008] Preferably, the conductive component includes an upper pressure plate fixedly connected to the bottom end of the second shock absorber, the inner surface of the upper pressure plate is slidably connected to a conductive plate, the bottom end of the conductive plate is fixedly connected to the upper end of the welding head, the inner surface of the upper pressure plate is fixedly connected to a U-shaped frame, a slide rail is provided inside the U-shaped frame, the inner surface of the slide rail is slidably connected to a rack, the U-shaped frame and the inner surface of the upper pressure plate are rotatably connected to a rotating rod, the middle outer surface of the rotating rod is fixedly connected to a ring gear, the outer surface of the ring gear is meshed with the outer surface of the rack, the left end of the rotating rod is fixedly connected to a knob, the right end of the rack is fixedly connected to a reset spring rod, and the other end of the reset spring rod is fixedly connected to the inner surface of the U-shaped frame.

[0009] Preferably, a welder is fixedly connected to the upper left end of the mounting frame, the output end of the welder is fixedly connected to the front end of the welding plate and the front end of the conductive component respectively, and the bottom end of the cutting tool matches the size of the groove on the welding plate.

[0010] Preferably, the end edge of the base frame is fixedly connected to the support frame, the upper inner side of the support frame is fixedly connected to the first motor, the output end of the first motor is transmission-connected to the bevel gear, the right end of the bevel gear is fixedly connected to the cam, the outer surface of the cam abuts the movable frame, the outer surface of the movable frame is slidably connected to the inner surface of the support frame, and the bottom end of the movable frame is fixedly connected to the top of the limit plate.

[0011] Preferably, the outer side of the support frame is fixedly connected to a terminal plate frame, the rear side of the support frame is fixedly connected to an arc plate, the rear side of the base frame is fixedly connected to a roller, the bottom outer surface of the support frame is fixedly connected to a second motor, and the output end of the second motor passes through the support frame and is fixedly connected to a limiting roller.

[0012] Preferably, the upper bottom end of the mounting frame is fixedly connected to a first electric push rod, the output end of the first electric push rod is fixedly connected to a fixing frame, the front end of the fixing frame is fixedly connected to a third motor, the output end of the third motor is fixedly connected to a rotating frame, the top end of the rotating frame is fixedly connected to a wire feeding frame, the front end of the wire feeding frame is fixedly connected to an airbag assembly, and the wire feeding frame and the inner surface of the airbag assembly are slidably connected with linear raw materials.

[0013] Preferably, the top and bottom ends of the mounting frame are fixedly connected to a fixed plate, the inner side of the fixed plate is fixedly connected to a second electric push rod, the output end of the second electric push rod is fixedly connected to a sliding frame, the bottom end of the sliding frame is fixedly connected to a fourth motor, and the output end of the fourth motor is fixedly connected to a limiting roller.

[0014] Compared with the prior art, the present invention provides a metal wire hot rolling equipment with the following beneficial effects:

[0015] The utility model is provided with a first shock absorber and a limiting slide plate, which can provide a certain degree of shock absorption to the upper and lower parts during pressing and rolling. In addition, the coaxiality of the sleeve and the sliding push head can be improved through the connecting rod action of the limiting spring rod, the Y-shaped frame and the telescopic rod, thereby ensuring the accurate rolling of the upper and lower parts and improving the overall reliability and accuracy.

[0016] The utility model can limit the U-shaped frame by twisting the knob under the meshing action of the ring gear and the rack, which is convenient for the installation and replacement of the U-shaped frame and the welding head, and improves the overall practicality. In addition, a reset spring rod is provided to ensure that the U-shaped frame will not loosen when the rack limits the U-shaped frame, and the stability of the limit can be guaranteed, thereby improving the overall reliability and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0019] Figure 3 A three-dimensional diagram from another perspective of the present invention;

[0020] Figure 4 It is a schematic diagram of some parts of the utility model;

[0021] Figure 5 An exploded view of a conductive component;

[0022] Figure 6 It is a schematic diagram of some parts of the conductive component;

[0023] Figure 7 Schematic diagram of the internal structure of the conductive component;

[0024] Figure 8 is a cross-sectional view of the reset assembly;

[0025] Figure 9 This is a diagram of the internal structure of the reset component.

[0026] The numbers in the figure are:

[0027] 1. Mounting cabinet; 2. Mounting frame; 3. Base frame; 4. Welding plate; 5. Reset assembly; 501. Sleeve; 502. Sliding pusher; 503. Fixing piece; 504. First shock absorber; 505. Limiting slide plate; 506. Limiting spring rod; 507. Y-shaped frame; 508. Lateral roller; 509. Telescopic rod; 510. Connecting spring; 6. Limiting plate; 7. Cutting tool; 8. Second shock absorber; 9. Conductive assembly; 901. Upper pressure plate; 902. Conductive plate; 903. U-shaped frame; 904. Slide rail; 905. Rack; 906. Rotating rod; 907. Ring gear; 908. Knob; 909. Return spring rod; 10. Welding head; 11. Welding machine; 12. Support frame; 13. First motor; 14. Bevel gear; 15. Cam; 16. Moving frame; 17. Terminal plate frame; 18. Arc plate; 19. Roller; 20. Second motor; 21. Limit roller; 22. First electric push rod; 23. Fixed frame; 24. Third motor; 25. Rotating frame; 26. Wire feeding frame; 27. Airbag assembly; 28. Linear material; 29. Fixed plate; 30. Second electric push rod; 31. Sliding frame; 32. Fourth motor; 33. Limit roller. DETAILED DESCRIPTION

[0028] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0029] Reference Figures 1 to 9As shown, a metal wire hot rolling equipment includes a mounting cabinet 1 and a mounting frame 2, the top of the mounting cabinet 1 is fixedly connected to a base frame 3, the upper end of the base frame 3 is fixedly connected to a welding plate 4, the upper end of the welding plate 4 is fixedly connected to a reset component 5, the top of the reset component 5 is fixedly connected to a limiting plate 6, the reset component 5 includes a sleeve 501 fixedly connected to the welding plate 4, the inner surface of the sleeve 501 is slidably connected to a sliding push head 502, the inner top of the sliding push head 502 is fixedly connected to a fixing member 503, the bottom top of the fixing member 503 is fixedly connected to a first shock absorber 504, the other end of the first shock absorber 504 is fixedly connected to a limiting slide 505, the outer surface of the limiting slide 505 slides with the outer surface of the sliding push head 502 and the inner surface of the sleeve 501 respectively. The inner surface of the fixing member 503 is fixedly connected to a limit spring rod 506, and the other end of the limit spring rod 506 is fixedly connected to a Y-shaped frame 507. The inner surface of the Y-shaped frame 507 is rotatably connected to a lateral roller 508. A telescopic rod 509 is fixedly connected between the opposite surfaces of the adjacent Y-shaped frames 507. The bottom end of the fixing member 503 is fixedly connected to a connecting spring 510, and the other end of the connecting spring 510 is fixedly connected to the inner bottom end of the welding plate 4. The bottom end of the limit plate 6 is fixedly connected to a cutting tool 7. The left bottom end of the limit plate 6 is fixedly connected to a second shock absorber 8, which can reduce the vibration between the limit plate 6 and the second shock absorber 8. The other end of the second shock absorber 8 is fixedly connected to a conductive component 9, and the bottom end of the conductive component 9 is fixedly connected to a welding head 10.The conductive component 9 includes an upper pressing plate 901 fixedly connected to the bottom end of the second shock absorber 8, a conductive plate 902 is slidably connected to the inner surface of the upper pressing plate 901, the bottom end of the conductive plate 902 is fixedly connected to the upper end of the welding head 10, a U-shaped frame 903 is fixedly connected to the inner surface of the upper pressing plate 901, a slide rail 904 is provided inside the U-shaped frame 903, a rack 905 is slidably connected to the inner surface of the slide rail 904, and the U-shaped frame 903 and the inner surface of the upper pressing plate 901 rotate A rotating rod 906 is connected, and a ring gear 907 is fixedly connected to the outer surface of the middle part of the rotating rod 906. The outer surface of the ring gear 907 is meshed with the outer surface of the rack 905. The left end of the rotating rod 906 is fixedly connected to a knob 908. The right end of the rack 905 is fixedly connected to a return spring rod 909. The other end of the return spring rod 909 is fixedly connected to the inner surface of the U-shaped frame 903. The upper left end of the mounting frame 2 is fixedly connected to the welding machine 11. The output of the welding machine 11 The ends are fixedly connected to the front end of the welding plate 4 and the front end of the conductive component 9 respectively. The bottom end of the cutting tool 7 matches the size of the groove on the welding plate 4, which can ensure the integrity of the terminal cutting in the groove. By providing a first shock absorber 504 and a limiting slide 505, a certain degree of shock absorption can be performed on the upper and lower parts during pressing and rolling. The connecting rod effect of the limiting spring rod 506, the Y-shaped frame 507 and the telescopic rod 509 can improve the coaxiality of the sleeve 501 and the sliding push head 502 to ensure the rolling of the upper and lower parts. The system is accurate, improving overall reliability and precision. By twisting the knob 908, the meshing action of the ring gear 907 and the rack 905 drives the rack 905 to limit the position of the U-shaped frame 903, facilitating the installation and replacement of the U-shaped frame 903 and the welding head 10, and improving overall practicality. A return spring rod 909 is provided to ensure that the U-shaped frame 903 does not become loose when the rack 905 limits the position of the U-shaped frame 903, ensuring stable positioning and improving overall reliability and stability.

[0030] In another embodiment provided by the present invention, Figures 1 to 9As shown, the end edge of the base frame 3 is fixedly connected to the support frame 12, and the upper inner side of the support frame 12 is fixedly connected to the first motor 13, and the output end of the first motor 13 is transmission-connected to the bevel gear 14, and the right end of the bevel gear 14 is fixedly connected to the cam 15, and the outer surface of the cam 15 abuts against the movable frame 16, and the outer surface of the movable frame 16 is slidably connected to the inner surface of the support frame 12, and the bottom end of the movable frame 16 is fixedly connected to the top of the limit plate 6, and is provided with a first motor 13. Through the bevel gear 14 and the cam 15, and under the resetting action of the resetting component 5, it can drive the cutting tool 7 on the limit plate 6 to automatically cut the terminal strip, which can ensure that the size of each terminal section is consistent, improve the stability and reliability of the finished product, and at the same time, with the cooperation of the second shock absorber 8, it can complete the first touch welding and then cutting, thereby improving the overall work efficiency and adaptability.

[0031] In another embodiment provided by the present invention, Figures 1 to 9 As shown, the outer side of the support frame 12 is fixedly connected to a terminal disk frame 17, the rear side of the support frame 12 is fixedly connected to an arc plate 18, and the rear side of the base frame 3 is fixedly connected to a roller 19, which is convenient for unfolding and stably conveying the terminal strip. The bottom outer surface of the support frame 12 is fixedly connected to a second motor 20, and the output end of the second motor 20 passes through the support frame 12 and is fixedly connected to a limiting roller 21. The outer surface of the limiting roller 21 abuts the terminal strip, which can extrude the shape of the terminal to complete the shaping and conveying of the terminal. The bottom upper end of the mounting frame 2 is fixedly connected to a first electric push rod 22, and the output end of the first electric push rod 22 is fixedly connected to a fixed frame 23. The front end of the fixed frame 23 is fixedly connected to a third motor 24, and the output end of the third motor 24 is fixedly connected to a rotating frame 25. The top of the rotating frame 25 is fixedly connected to a wire feeding frame 26, and the front end of the wire feeding frame 26 is fixedly connected to an airbag assembly 27. The airbag assembly 27 consists of a sleeve and a connection to an external air pressure controller. The airbag can adjust the clamping and loosening of the linear raw material 28 by changing the ventilation volume to ensure the stability of the wire feeding. The wire feeding frame 26 is slidably connected to the inner surface of the airbag assembly 27 with the linear raw material 28. By providing a first electric push rod 22 and a third motor 24, the height and angle of the wire feeding frame 26 can be adjusted to accurately align the linear raw material 28 between the groove on the welding plate 4 and the limiting roller 33, so as to improve the accuracy of butt welding and the stability of wire feeding. The top and bottom ends of the mounting frame 2 are fixedly connected to a fixed plate 29, and the inner side of the fixed plate 29 is fixedly connected to a second electric push rod 30. The output end of the second electric push rod 30 is fixedly connected to a sliding frame 31, and the bottom end of the sliding frame 31 is fixedly connected to a fourth motor 32. The output end of the fourth motor 32 is fixedly connected to a limiting roller 33. The second electric push rod 30 and the fourth motor 32 can drive the limiting roller 33 to automatically straighten the wire feeding of the linear raw material 28, thereby improving the efficiency and stability of wire feeding.

[0032] Working principle: During installation, the terminal disk is installed on the terminal disk rack 17, and one end of the terminal strip is fed from the outside of the arc plate 18 and the roller 19 into the groove on the welding plate 4. The outer surface of the limiting roller 21 abuts against the terminal strip, which can squeeze the terminal strip, complete the shaping and conveying of the terminal strip, and improve work efficiency. The linear material 28 passes through the airbag assembly 27 and passes out from the rear end of the wire feeding frame 26. When in use, start the first electric push rod 22 and the third motor 24, adjust the height and angle of the wire feeding frame 26, drive the linear material 28 between the limiting roller 33, and start the second electric push rod 30. Drive the limiting roller 33 to clamp the linear material 28, then start the fourth motor 32 to rotate, complete the straightening and feeding of the linear material 28, and after completion, start the airbag assembly 27 to fix the linear material 28, start the second electric push rod 30 and the fourth motor 32 to drive the limiting roller 33 to release the linear material 28, start the first electric push rod 22 and the third motor 24 to drive the linear material 28 to abut against the groove on the welding plate 4, start the second motor 20, drive the terminal strip to abut against the linear material 28, start the first motor 13, and the output end of the first motor 13 is connected through the bevel gear 14 The cam 15 drives the conductive component 9 and the welding head 10 to contact the linear raw material 28 and the terminal strip, and starts the welding machine 11 to complete the welding of the linear raw material 28 and the terminal strip, and at the same time drives the cutting tool 7 to complete the cutting of the terminal strip. Through the first shock absorber 504 and the limiting slide 505, a certain degree of shock absorption can be performed on the upper and lower parts during pressing and rolling, and the connecting rod action of the limiting spring rod 506, the Y-shaped frame 507 and the telescopic rod 509 can improve the coaxiality of the sleeve 501 and the sliding push head 502, thereby ensuring the accurate rolling of the upper and lower parts and improving the overall reliability and accuracy; start The first electric push rod 22 and the third motor 24 deliver the finished product and complete the butt welding. When the U-shaped frame 903 is replaced, by twisting the knob 908, the rack 905 can be driven to limit the U-shaped frame 903 under the meshing action of the ring gear 907 and the rack 905, so as to facilitate the installation and replacement of the U-shaped frame 903 and the welding head 10, thereby improving the overall practicality. A reset spring rod 909 is provided to ensure that the U-shaped frame 903 will not become loose when the rack 905 limits the U-shaped frame 903, thereby ensuring the stability of the limit and improving the overall reliability and stability.

[0033] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed for the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal wire hot rolling equipment, characterized in that, The invention comprises an installation cabinet (1) and an installation frame (2), wherein the top end of the installation cabinet (1) is fixedly connected to a base frame (3), the upper end of the base frame (3) is fixedly connected to a welding plate (4), the upper end of the welding plate (4) is fixedly connected to a reset assembly (5), and the top end of the reset assembly (5) is fixedly connected to a limit plate (6); The reset assembly (5) comprises a sleeve (501) fixedly connected to the welding plate (4); the inner surface of the sleeve (501) is slidably connected to a sliding push head (502); the inner top of the sliding push head (502) is fixedly connected to a fixing member (503); the bottom top of the fixing member (503) is fixedly connected to a first shock absorber (504); the other end of the first shock absorber (504) is fixedly connected to a limiting slide (505); the outer surface of the limiting slide (505) is respectively in contact with the outer surface of the sliding push head (502) and the sleeve (501). The inner surface of the fixing member (503) is slidably connected, the inner surface of the fixing member (503) is fixedly connected to a limiting spring rod (506), the other end of the limiting spring rod (506) is fixedly connected to a Y-shaped frame (507), the inner surface of the Y-shaped frame (507) is rotatably connected to a lateral roller (508), and a telescopic rod (509) is fixedly connected between the opposite surfaces of adjacent Y-shaped frames (507), the bottom end of the fixing member (503) is fixedly connected to a connecting spring (510), and the other end of the connecting spring (510) is fixedly connected to the inner bottom end of the welding plate (4).

2. The metal wire hot rolling equipment according to claim 1, characterized in that: The bottom end of the limiting plate (6) is fixedly connected to a cutting tool (7), the left bottom end of the limiting plate (6) is fixedly connected to a second shock absorber (8), the other end of the second shock absorber (8) is fixedly connected to a conductive component (9), and the bottom end of the conductive component (9) is fixedly connected to a welding head (10).

3. The metal wire hot rolling equipment according to claim 2, characterized in that: The conductive assembly (9) comprises an upper pressing plate (901) fixedly connected to the bottom end of the second shock absorber (8), a conductive plate (902) is slidably connected to the inner surface of the upper pressing plate (901), the bottom end of the conductive plate (902) is fixedly connected to the upper end of the welding head (10), a U-shaped frame (903) is fixedly connected to the inner surface of the upper pressing plate (901), a slide rail (904) is provided inside the U-shaped frame (903), a rack (905) is slidably connected to the inner surface of the slide rail (904), and the U-shaped frame (903) is fixedly connected to the inner surface of the upper pressing plate (901). ) and the inner surface of the upper pressure plate (901) are rotatably connected to a rotating rod (906), the outer surface of the middle part of the rotating rod (906) is fixedly connected to a ring gear (907), the outer surface of the ring gear (907) is meshed with the outer surface of the rack (905), the left end of the rotating rod (906) is fixedly connected to a knob (908), the right end of the rack (905) is fixedly connected to a return spring rod (909), the other end of the return spring rod (909) is fixedly connected to the inner surface of the U-shaped frame (903).

4. The metal wire hot rolling equipment according to claim 2, characterized in that: A welder (11) is fixedly connected to the upper left end of the mounting frame (2), and the output end of the welder (11) is fixedly connected to the front end of the welding plate (4) and the front end of the conductive component (9), respectively. The bottom end of the cutting tool (7) matches the size of the groove on the welding plate (4).

5. The metal wire hot rolling equipment according to claim 1, characterized in that: The end edge of the base frame (3) is fixedly connected to a support frame (12), the upper inner side of the support frame (12) is fixedly connected to a first motor (13), the output end of the first motor (13) is transmission-connected to a bevel gear (14), the right end of the bevel gear (14) is fixedly connected to a cam (15), the outer surface of the cam (15) is in contact with a moving frame (16), the outer surface of the moving frame (16) is slidably connected to the inner surface of the support frame (12), and the bottom end of the moving frame (16) is fixedly connected to the top end of the limiting plate (6).

6. The metal wire hot rolling equipment according to claim 5, characterized in that: The outer side of the support frame (12) is fixedly connected to a terminal disk frame (17), the rear side of the support frame (12) is fixedly connected to an arc plate (18), the rear side of the base frame (3) is fixedly connected to a roller (19), the outer bottom surface of the support frame (12) is fixedly connected to a second motor (20), and the output end of the second motor (20) passes through the support frame (12) and is fixedly connected to a limiting roller (21).

7. The metal wire hot rolling equipment according to claim 1, characterized in that: The upper end of the bottom of the mounting frame (2) is fixedly connected to a first electric push rod (22), the output end of the first electric push rod (22) is fixedly connected to a fixing frame (23), the front end of the fixing frame (23) is fixedly connected to a third motor (24), the output end of the third motor (24) is fixedly connected to a rotating frame (25), the top end of the rotating frame (25) is fixedly connected to a wire feeding frame (26), the front end of the wire feeding frame (26) is fixedly connected to an airbag assembly (27), and the inner side surface of the wire feeding frame (26) and the airbag assembly (27) is slidably connected to a linear material (28).

8. The metal wire hot rolling equipment according to claim 1, characterized in that: The bottom end of the top of the mounting frame (2) is fixedly connected to a fixing plate (29), the inner side of the fixing plate (29) is fixedly connected to a second electric push rod (30), the output end of the second electric push rod (30) is fixedly connected to a sliding frame (31), the bottom end of the sliding frame (31) is fixedly connected to a fourth motor (32), and the output end of the fourth motor (32) is fixedly connected to a limiting roller (33).

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