A spring cold rolling forming equipment

Abstract

The invention relates to the field of spring cold rolling forming, and discloses a spring cold rolling forming device, comprising a conveying seat and a cold rolling roller, wherein a conveying structure is arranged in the conveying seat, a bracket is fastened with bolts at a position close to the right side of the conveying seat, and a vertical cold rolling structure is arranged on the bracket, and the cold rolling roller can be used to cold roll the spring by rotating the cold rolling roller vertically arranged on the vertical cold rolling structure and moving the cold rolling roller downward, and after cold rolling, the cold rolling roller moves up and resets, and during the resetting process, the cold rolling roller drives the top end of the formed spring to press against the bracket, and as the cold rolling roller continues to move up, under the shielding effect of the bracket on the spring and in cooperation with the gravity of the spring itself, the spring can be automatically pushed down from the cold rolling roller for unloading while the cold rolling roller is reset, so that the resetting time of the cold rolling roller is fully utilized, and the unloading operation of the spring is more labor-saving and convenient.

Description

Technical Field

[0001] The invention relates to the technical field of spring cold rolling forming, in particular to a spring cold rolling forming device. Background Art

[0002] A spring is a mechanical part that uses elasticity to work. A part made of elastic material deforms under external force and returns to its original shape after the external force is removed. It is also called a "spring". It is generally made of spring steel. There are many types of springs. According to their shapes, they mainly include helical springs, scroll springs, leaf springs, special-shaped springs, etc. When cold-rolling a spring, cold-rolling equipment is required.

[0003] The spring cold roll forming equipment in the prior art fixes the iron wire on one end of the fixed rod near the clamping head, starts the rotating clamping head, makes the rotating clamping head rotate at a high speed, and uses the movement of the slider on the slide rod to drive the iron wire to be evenly wound around the fixed rod, so as to quickly form the iron wire into a spiral shape on the fixed rod;

[0004] However, after the spring is formed, the equipment in the prior art needs to rotate the slide rod in the opposite direction to drive the slider to move in the opposite direction and reset on the slide rod before the next spring can be formed. The reset time of the slider is not fully utilized. At the same time, after the spring is formed, it is necessary to manually remove the formed spring from the fixed rod, which is time-consuming and laborious. Therefore, there is room for improvement. Summary of the invention

[0005] In order to solve the problems raised in the above background technology, the present invention provides a spring cold rolling forming device.

[0006] The present invention provides a spring cold roll forming device adopts the following technical solution:

[0007] A spring cold roll forming device comprises a conveying seat and a cold roll roller, wherein a conveying structure is arranged in the conveying seat, a bracket is fastened with bolts at a position close to the right side of the conveying seat, a vertical cold roll structure is arranged on the bracket, a U-shaped plate is connected to the middle of the right side of the bracket, a guide structure is arranged in the middle of the lower side of the U-shaped plate, and a lifting and cutting structure is arranged in the middle of the upper side of the U-shaped plate;

[0008] The vertical cold coil structure includes a cold coil roller which moves vertically through the middle of the bracket, a limiting structure is arranged at the bottom end of the cold coil roller, an annular groove is opened at the position near the top of the side surface of the cold coil roller, a movable sleeve in the annular groove is provided with a lifting sleeve, two first protrusions are installed at the lower part of the side surface of the lifting sleeve, a hydraulic cylinder is installed at the position below the two first protrusions on the bracket, the top end of the hydraulic cylinder output shaft is connected to the first protrusion, two second protrusions are connected at the upper position of the side surface of the lifting sleeve, a support rod is connected at the upper part of the two second protrusions, a mounting plate is installed between the top ends of the two support rods, a first motor is installed at the upper part of the mounting plate, and the bottom end of the output shaft of the first motor is connected to the top end of the cold coil roller.

[0009] Preferably, the limiting structure includes a lifting cylinder arranged below the cold coil roller, and the lifting cylinder is installed on the cold coil roller through a lifting transmission structure. Two openings are opened on the side of the lifting cylinder, and the two openings are distributed in the radial direction of the lifting cylinder. Two limiting blocks are arranged in the lifting cylinder, and the two "L"-shaped limiting blocks are movably inserted into the openings.

[0010] Preferably, the lifting transmission structure includes a first electric telescopic rod installed on the bottom end of the cold coil roller, the bottom end of the output shaft of the first electric telescopic rod is connected to the lifting cylinder, radial grooves are provided at positions corresponding to the two openings on the lower inner wall of the lifting cylinder, a first moving block is slidably arranged in the radial groove, a first driving plate is installed on the top of each of the first moving blocks, the two limit blocks are respectively connected to the upper parts of the two first driving plates away from each other on one side, a first guide groove is provided on each of the first driving plates, the first guide groove is in an "S" shape, a through rod is movably passed through the top of each of the first guide grooves, and the top end of the through rod is connected to the cold coil roller.

[0011] Preferably, the conveying structure includes rollers rotatably connected to the left and right ends of the inner walls on the front and rear sides of the conveying seat, and conveyor belts are tightly sleeved on the two rollers. A second motor is installed on the left side of the front side of the conveying seat, and one end of the output shaft of the second motor is connected to the corresponding rollers. The front and rear edges of the conveying seat are vertically connected with shielding edges.

[0012] Preferably, the guide structure includes a guide frame installed in the middle of the lower side of the U-shaped plate, an insertion slot is provided in the middle of the upper side of the guide frame, the insertion slot is connected to the guide frame, a baffle is installed on the right side of the guide frame, a through opening is provided on the baffle, an outlet slot is provided on the left side of the guide frame at a position corresponding to the through opening, fixed plates are connected to the inner walls on both sides of the front and rear of the guide frame, and guide wheels are installed at the ends of the two fixed plates close to each other.

[0013] Preferably, the lifting and cutting structure includes a cutting frame arranged at the U-shaped plate directly above the insertion slot, the outer diameter of the cutting frame is the same as the inner diameter of the insertion slot, a third motor is installed on the right inner wall of the cutting frame, a cutting knife is installed on one end of the output shaft of the third motor, the cutting knife extends out from the bottom of the cutting frame, second electric telescopic rods are installed on both sides of the cutting frame on the U-shaped plate, the top end of the output shaft of the second electric telescopic rod is connected to the cutting frame, and a driving structure is arranged between the cutting frame and the baffle.

[0014] Preferably, the driving structure includes a longitudinal groove opened in the middle of the right side surface of the U-shaped plate, a second movable block is slidably arranged in the longitudinal groove, a second driving plate is connected to the upper side of the second movable block, a second guide groove is opened on the second driving plate, the second guide groove is in an "S" shape, a driving rod is connected to the position of the right side surface of the cutting frame corresponding to the second guide groove, the driving rod moves through the top end of the second guide groove, a connecting strip is connected to the lower side of the second movable block, and one end of the connecting strip is connected to the baffle.

[0015] In summary, the present invention includes the following beneficial technical effects:

[0016] The present invention provides a vertical cold rolling structure on the bracket, utilizes the rotation of the cold rolling roller vertically arranged on the vertical cold rolling structure, and the downward movement of the cold rolling roller, so that the cold rolling roller can perform cold rolling forming work on the spring, and after cold rolling, the cold rolling roller moves up and resets, and in the process of resetting, the cold rolling roller drives the top end of the formed spring to press against the bracket, and as the cold rolling roller continues to move up, under the shielding effect of the bracket on the spring and in cooperation with the gravity of the spring itself, the spring can be automatically pushed down from the cold rolling roller for unloading while the cold rolling roller is reset, so that the resetting time of the cold rolling roller is fully utilized, and the unloading operation of the spring is more labor-saving and convenient; and a conveying structure is provided on the conveying seat, and the unloading spring can fall onto the conveying belt of the conveying structure, and the conveying work can be automatically performed by utilizing the rotation of the conveying belt;

[0017] The present invention provides a limiting structure and a lifting transmission structure at the bottom end of the cold coil roller. By using the limiting structure and the lifting transmission structure, two limiting blocks can be moved upward at the bottom end of the cold coil roller to push open, so as to limit one end of the spring, thereby facilitating cold coiling. At the same time, when moving downward, the limiting block can be driven to move downward and close the two limiting blocks, thereby preventing the limiting block from interfering with the normal material feeding work of the spring.

[0018] The present invention provides a guide structure, a lifting and cutting structure and a driving structure on the U-shaped plate. The guide structure can guide the iron rod during the spring forming process. The lifting and cutting structure and the driving structure can drive the rotating cutting knife to move up and down to cut the iron rod. The guide frame and the cutting frame can be used to block the debris generated during the cutting process, thereby improving the quality of the working environment. The driving structure can also be used to drive the baffle to move and block the cutting frame when the cutting frame moves downward to drive the cutting knife to cut. When the cutting frame moves upward, the baffle can be automatically opened to facilitate cleaning of the debris collected in the guide frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a spring cold roll forming device in an embodiment of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the conveying structure in an embodiment of the present invention;

[0021] Figure 3 is a schematic structural diagram of a bracket in an embodiment of the present invention;

[0022] Figure 4 is a schematic structural diagram of a U-shaped plate in an embodiment of the present invention;

[0023] Figure 5 is a schematic diagram of the structure inside the cutting frame in an embodiment of the present invention;

[0024] Figure 6 It is a structural schematic diagram of the lifting cylinder in an embodiment of the present invention;

[0025] Figure 7 Schematic diagram of the internal structure of the lifting cylinder in an embodiment of the present invention;

[0026] Figure 8 In the embodiment of the present invention Figure 7 A magnified view of the structure at A.

[0027] Description of reference numerals: 1. conveying seat; 2. bracket; 3. cold roll roller; 4. annular groove; 5. lifting sleeve; 6. first protrusion; 7. hydraulic cylinder; 8. second protrusion; 9. support rod; 10. mounting plate; 11. first motor; 12. lifting cylinder; 13. first driving plate; 14. limit block; 15. opening; 16. through rod; 17. first moving block; 18. radial groove; 19. first guide groove; 20. first electric telescopic rod; 21. conveyor belt; 22. Roller; 23. Second motor; 24. Blocking edge; 25. U-shaped plate; 26. Guide frame; 27. Fixed plate; 28. Guide wheel; 29. ​​Baffle; 30. Through-hole; 31. Out-of-hole; 32. Second electric telescopic rod; 33. Cutting frame; 34. Third motor; 35. Cutting knife; 36. Insertion slot; 37. Driving rod; 38. Second driving plate; 39. Second guide slot; 40. Second moving block; 41. Longitudinal slot; 42. Connecting strip. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-Figure 8 The present invention is described in further detail.

[0029] Reference Figure 1-Figure 8 The embodiment of the present invention discloses a spring cold roll forming device, comprising a conveying seat 1 and a cold roll roller 3, wherein a conveying structure is arranged in the conveying seat 1, a bracket 2 is fastened by bolts at a position close to the right side of the conveying seat 1, a vertical cold roll structure is arranged on the bracket 2, a U-shaped plate 25 is connected to the middle of the right side of the bracket 2, a guide structure is arranged in the middle of the lower side of the U-shaped plate 25, and a lifting and cutting structure is arranged in the middle of the upper side of the U-shaped plate 25;

[0030] The vertical cold coil structure includes a cold coil roller 3 that vertically moves through the middle of the bracket 2, a limiting structure is arranged at the bottom end of the cold coil roller 3, an annular groove 4 is opened at the position near the top of the side of the cold coil roller 3, a lifting sleeve 5 is arranged on the movable sleeve in the annular groove 4, two first protrusions 6 are installed at the lower part of the side of the lifting sleeve 5, a hydraulic cylinder 7 is installed on the bracket 2 at the lower part of the two first protrusions 6, the top end of the output shaft of the hydraulic cylinder 7 is connected to the first protrusion 6, two second protrusions 8 are connected at the upper part of the side of the lifting sleeve 5, a support rod 9 is connected at the upper part of the two second protrusions 8, a mounting plate 10 is installed between the top ends of the two support rods 9, a first motor 11 is installed at the upper part of the mounting plate 10, and the bottom end of the output shaft of the first motor 11 is connected to the top end of the cold coil roller 3;

[0031] The conveying structure includes rollers 22 rotatably connected to the left and right ends of the inner walls on both sides of the conveying seat 1, and a conveyor belt 21 is tightly sleeved on the two rollers 22. A second motor 23 is installed on the left side of the front of the conveying seat 1. One end of the output shaft of the second motor 23 is connected to the corresponding roller 22. The front and rear edges of the conveying seat 1 are vertically connected with a shielding edge 24. When the cold spring is rolled on the cold roll 3, the mounting plate 10 is first started, and the first motor 11 on it drives the cold roll 3 to rotate. At the same time, the hydraulic cylinder 7 is started to drive the cold roll 3 and the first motor 11 to move downward as a whole, so that the cold spring is evenly rolled on the cold roll 3. After the spring is formed, the hydraulic cylinder 7 is started to drive the cold roll 3 to move up and reset. During the upward movement of the cold roll 3, the spring can be automatically pushed down from the cold roll 3 by the shielding of the spring by the bracket 2 for unloading. In this way, the reset time of the cold roll 3 can be fully utilized to improve work efficiency. The spring after unloading falls onto the rotating conveyor belt 21, and the rotating conveyor belt 21 performs the feeding work.

[0032] See also Figure 1 , Figure 3 , Figure 6 , Figure 7 and Figure 8 The limiting structure includes a lifting cylinder 12 arranged below the cold coil roller 3. The lifting cylinder 12 is installed on the cold coil roller 3 through a lifting transmission structure. Two openings 15 are provided on the side of the lifting cylinder 12. The two openings 15 are distributed in the radial direction of the lifting cylinder 12. Two limiting blocks 14 are arranged in the lifting cylinder 12. The two "L"-shaped limiting blocks 14 are movably inserted into the openings 15.

[0033] The lifting transmission structure includes a first electric telescopic rod 20 installed on the bottom end of the cold roll 3, the bottom end of the output shaft of the first electric telescopic rod 20 is connected to the lifting cylinder 12, and radial grooves 18 are provided at the positions of the two openings 15 corresponding to the lower inner wall of the lifting cylinder 12. A first moving block 17 is slidably arranged in the radial groove 18, and a first driving plate 13 is installed on the top of each first moving block 17. Two limit blocks 14 are respectively connected to the upper part of the two first driving plates 13 away from one side. A first guide groove 19 is provided on each first driving plate 13, and the first guide groove 19 is in an "S" shape. The top of each first guide groove 19 is movable The lifting cylinder 12 is movable through a through rod 16, and the top end of the through rod 16 is connected to the cold coil roller 3. During cold coiling, the first electric telescopic rod 20 is started to drive the lifting cylinder 12 to move upward, so as to drive the first driving plate 13 to move upward on the through rod 16. The through rod 16 squeezes the groove wall of the first guide groove 19 to push the limit blocks 14 on the two first driving plates 13 out of the opening 15. When the lifting cylinder 12 moves up and presses against the cold coil roller 3, the limit block 14 moves up to the end of the cold coil roller 3, so that one end of the iron rod can be inserted between one of the limit blocks 14 and the cold coil roller 3, and the cold coil forming work can be smoothly performed on the rotating cold coil roller 3.

[0034] See also Figure 1 , Figure 6 and Figure 8 The guide structure includes a guide frame 26 installed in the middle of the lower side of the U-shaped plate 25, an insertion slot 36 is provided in the middle of the upper side of the guide frame 26, and the insertion slot 36 is connected to the guide frame 26. A baffle 29 is installed on the right side of the guide frame 26, and a through hole 30 is provided on the baffle 29. A through slot 31 is provided on the left side of the guide frame 26 at a position corresponding to the through hole 30. The inner walls of the front and rear sides of the guide frame 26 are connected to fixing plates 27, and guide wheels 28 are installed at the ends of the two fixing plates 27 close to each other.

[0035] The lifting and cutting structure includes a cutting frame 33 arranged at the U-shaped plate 25 just above the insertion slot 36, the outer diameter of the cutting frame 33 is the same as the inner diameter of the insertion slot 36, a third motor 34 is installed on the right inner wall of the cutting frame 33, a cutting knife 35 is installed on one end of the output shaft of the third motor 34, and the cutting knife 35 extends out from the bottom of the cutting frame 33, and second electric telescopic rods 32 are installed on both sides of the cutting frame 33 on the U-shaped plate 25, the top end of the output shaft of the second electric telescopic rod 32 is connected to the cutting frame 33, and a driving structure is arranged between the cutting frame 33 and the baffle 29;

[0036] The driving structure includes a longitudinal groove 41 provided in the middle of the right side of the U-shaped plate 25, a second moving block 40 is slidably arranged in the longitudinal groove 41, a second driving plate 38 is connected to the upper part of the second moving block 40, a second guide groove 39 is provided on the second driving plate 38, and the second guide groove 39 is in an "S" shape. A driving rod 37 is connected to the position corresponding to the second guide groove 39 on the right side of the cutting frame 33, and the driving rod 37 moves through the top end of the second guide groove 39. A connecting strip 42 is connected to the lower part of the second moving block 40, and one end of the connecting strip 42 is connected to the baffle 29. After the spring is formed, when the next spring needs to be formed, the second electric telescopic rod 32 on the U-shaped plate 25 can be started to drive The cutting frame 33 moves downward, and at the same time, the third motor 34 on the inner wall of the cutting frame 33 is started to drive the cutting knife 35 to rotate, so that when the cutting frame 33 is inserted into the guide frame 26, the rotating cutting knife 35 can be driven to automatically cut the iron rod in the guide frame 26, and the cutting frame 33 and the guide frame 26 can be used to shield the debris generated in the cutting process, thereby improving the quality of the working environment, and the downward movement of the cutting frame 33 drives the driving rod 37 to move downward in the second guide groove 39, pushing the second driving plate 38 to drive the baffle 29 to close to the guide frame 26, and when the cutting frame 33 moves upward, the baffle 29 can be automatically opened on the guide frame 26, so that the debris shielded in the guide frame 26 can be cleaned up.

[0037] The implementation principle of a spring cold roll forming device according to an embodiment of the present invention is as follows: first, the first electric telescopic rod 20 at the bottom end of the cold roll roller 3 is started to drive the lifting cylinder 12 to move upward, thereby driving the first driving plate 13 to move upward on the through rod 16, and the through rod 16 is used to squeeze the first guide groove 19 groove wall on the first driving plate 13, so as to push the two first driving plates 13 to drive the first moving block 17 to move in the radial groove 18, thereby automatically pushing out the limit block 14 from the two openings 15, and when the lifting cylinder 12 moves up and presses against the cold roll roller 3, the limit block 14 moves up to the end of the cold roll roller 3, and then one end of the iron rod is inserted between one of the limit blocks 14 and the cold roll roller 3, and the first motor 11 on the mounting plate 10 is started to drive the cold roll roller 3 to rotate, and at the same time, the hydraulic cylinder 7 is started to drive the lifting sleeve 5 to move downward, thereby driving the rotating cold roll roller 3 to move downward, and the spring is cold rolled. During the forming process, when the forming is almost completed, the second electric telescopic rod 32 on the U-shaped plate 25 is started to drive the cutting frame 33 to move downward. At the same time, the third motor 34 in the cutting frame 33 is started to drive the cutting knife 35 to rotate. In this way, when the cutting frame 33 moves downward and is inserted into the guide frame 26, the rotating cutting knife 35 can be used to cut the iron rod. Then the cold rolling roller 3 continues to rotate to cold roll the iron rod, and one end of the cut iron rod is pulled out from the outlet groove 31. When the spring is completed, the first electric telescopic rod 20 drives the lifting cylinder 12 to move downward and reset, and drives the two limit blocks 14 to be re-stored in the opening 15. Finally, the hydraulic cylinder 7 drives the cold rolling roller 3 to move upward and reset. During the upward movement, the spring is automatically pushed out on the cold rolling roller 3 for unloading by using the bracket 2 to block the spring. The unloaded spring falls to the rotating conveyor belt 21, and the formed spring is transported by the rotating conveyor belt 21.

[0038] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A spring cold roll forming device, comprising a conveying seat (1) and a cold roll roller (3), characterized in that: A conveying structure is provided in the conveying seat (1); a bracket (2) is fastened with bolts at a position close to the right side of the conveying seat (1); a vertical cold roll structure is provided on the bracket (2); a U-shaped plate (25) is connected to the middle of the right side of the bracket (2); a guide structure is provided at the middle of the lower side of the U-shaped plate (25); and a lifting and cutting structure is provided at the middle of the upper side of the U-shaped plate (25); The vertical cold coil structure comprises a cold coil roller (3) which moves vertically through the middle of the bracket (2); a limiting structure is arranged at the bottom end of the cold coil roller (3); an annular groove (4) is provided at a position near the top end of the side of the cold coil roller (3); a lifting sleeve (5) is provided in a movable sleeve in the annular groove (4); two first protrusions (6) are installed at the lower part of the side of the lifting sleeve (5); a hydraulic cylinder (7) is installed on the bracket (2) at a position below the two first protrusions (6); the top end of the output shaft of the hydraulic cylinder (7) is connected to the first protrusion (6); two second protrusions (8) are connected at a position above the side of the lifting sleeve (5); support rods (9) are connected at the upper part of the two second protrusions (8); a mounting plate (10) is installed between the top ends of the two support rods (9); a first motor (11) is installed at the upper part of the mounting plate (10); the bottom end of the output shaft of the first motor (11) is connected to the top end of the cold coil roller (3); The limiting structure comprises a lifting cylinder (12) arranged below the cold coil roller (3), the lifting cylinder (12) being installed on the cold coil roller (3) via a lifting transmission structure, two openings (15) being provided on the side of the lifting cylinder (12), the two openings (15) being distributed in the radial direction of the lifting cylinder (12), two limiting blocks (14) being arranged inside the lifting cylinder (12), the two "L"-shaped limiting blocks (14) being movably inserted into the openings (15); The lifting transmission structure comprises a first electric telescopic rod (20) mounted on the bottom end of the cold coil roller (3), the bottom end of the output shaft of the first electric telescopic rod (20) is connected to the lifting cylinder (12), radial grooves (18) are provided at positions of the lower inner wall of the lifting cylinder (12) corresponding to the two openings (15), a first moving block (17) is slidably arranged in the radial groove (18), a first driving plate (13) is installed on the top of each of the first moving blocks (17), two limit blocks (14) are respectively connected to the upper parts of the two first driving plates (13) away from one side, each of the first driving plates (13) is provided with a first guide groove (19), the first guide groove (19) is in an "S" shape, a through rod (16) is movably passed through the top end of each of the first guide grooves (19), and the top end of the through rod (16) is connected to the cold coil roller (3).

2. A spring cold roll forming device according to claim 1, characterized in that: The conveying structure comprises rollers (22) rotatably connected to the left and right ends of the inner walls on both sides of the conveying seat (1), and the two rollers (22) are tightly sleeved with a conveying belt (21). A second motor (23) is installed on the left side of the front face of the conveying seat (1), and one end of the output shaft of the second motor (23) is connected to the corresponding roller (22). The front and rear edges of the conveying seat (1) are both vertically connected to shielding edges (24).

3. The spring cold roll forming equipment according to claim 1, characterized in that: The guide structure comprises a guide frame (26) mounted in the middle of the lower side of the U-shaped plate (25); an insertion slot (36) is provided in the middle of the upper side of the guide frame (26); the insertion slot (36) is communicated with the guide frame (26); a baffle (29) is mounted on the right side of the guide frame (26); a through opening (30) is provided on the baffle (29); a through slot (31) is provided on the left side of the guide frame (26) at a position corresponding to the through opening (30); fixed plates (27) are connected to the inner walls on both the front and rear sides of the guide frame (26); guide wheels (28) are mounted at the ends of the two fixed plates (27) close to each other.

4. The spring cold roll forming equipment according to claim 1, characterized in that: The lifting and cutting structure comprises a cutting frame (33) arranged on the U-shaped plate (25) just above the insertion slot (36); the outer diameter of the cutting frame (33) is the same as the inner diameter of the insertion slot (36); a third motor (34) is mounted on the right inner wall of the cutting frame (33); a cutting knife (35) is mounted on one end of the output shaft of the third motor (34); the cutting knife (35) extends out from the bottom of the cutting frame (33); second electric telescopic rods (32) are mounted on both sides of the cutting frame (33) on the U-shaped plate (25); the top end of the output shaft of the second electric telescopic rod (32) is connected to the cutting frame (33); and a driving structure is arranged between the cutting frame (33) and the baffle (29).

5. A spring cold roll forming device according to claim 4, characterized in that: The driving structure comprises a longitudinal groove (41) provided in the middle of the right side of the U-shaped plate (25), a second moving block (40) being slidably arranged in the longitudinal groove (41), a second driving plate (38) being connected to the upper side of the second moving block (40), a second guide groove (39) being provided on the second driving plate (38), the second guide groove (39) being in an "S" shape, a driving rod (37) being connected to the right side of the cutting frame (33) at a position corresponding to the second guide groove (39), the driving rod (37) being movable through the top end of the second guide groove (39), a connecting strip (42) being connected to the lower side of the second moving block (40), one end of the connecting strip (42) being connected to the baffle plate (29).

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