Tab cutting and shaping device

Abstract

The invention provides a tab cutting and shaping device, and relates to the technical field of tab processing. A servo motor is mounted at the bottom of the conveying main body, a shaping lower fixed roller is mounted in the conveying main body, and the servo motor is in transmission connection with the shaping lower fixed roller; a shaping upper action roller is installed in the conveying body and located over the shaping lower fixed roller, the top of the conveying body is connected with a movable lower pressing frame, and the two ends of the bottom of the movable lower pressing frame are connected with the shaping upper action roller. And the movable pressing frame is influenced by the thrust of the spring to drive the shaping upper action roller to move downwards, so that the bottom of the shaping upper action roller is in contact with the top of the tab raw material, the tab raw material is rolled to be flat and shaped, and then tab cutting operation is performed. The problems that when an existing cutting device for tab machining is applied, tab raw materials are generally in a roll shape, after the device finishes cutting, tabs have certain arc degrees, the tabs need to be conveyed into shaping equipment to be subjected to leveling treatment, and the process is tedious are solved.

Description

Technical Field

[0001] The invention relates to the technical field of tab processing, and in particular to a tab cutting and shaping device. Background Art

[0002] The battery is divided into positive and negative poles. The tabs are metal conductors that lead the positive and negative poles out of the battery cell. Generally speaking, the tabs on the positive and negative poles of the battery are the contact points during charging and discharging; this contact point is not the copper sheet we see on the outside of the battery, but a connection inside the battery; the tabs are divided into three types of materials. The positive pole of the battery uses aluminum material, the negative pole uses nickel material, and the negative pole also has copper-plated nickel material. They are all composed of two parts: film and metal strip; the tabs need to be cut and shaped during the processing to ensure the quality of the tabs.

[0003] For example, the Chinese patent "CN109894660B Tab cutting device and battery cell tab processing system" includes a bracket, a detector, a controller and a bracket drive mechanism; the bracket is equipped with an upper knife and a lower knife, and the upper knife and the lower knife are used to move relative to each other in the up and down directions to perform height cutting on a single tab to be cut; the detector is used to detect the position of a single tab to be cut in the direction of pole piece movement and the height of the tab before cutting; the controller is used to receive the detection information output by the detector and output control information to the bracket drive mechanism; the bracket drive mechanism is a servo drive mechanism, which is connected to the bracket drive, and drives the bracket to move with the upper knife and the lower knife to the corresponding cutting position according to the received control information.

[0004] When the existing cutting device for processing the tabs is used, since the tab materials are usually in a roll shape, the tabs will have a certain amount of curvature after the device has finished cutting, which makes it difficult to meet the high quality requirements. Therefore, the tabs need to be transported to the shaping equipment for leveling, which is a relatively cumbersome process. Summary of the invention

[0005] The present invention relates to a tab cutting and shaping device, which solves the problem that, when the existing cutting device for tab processing is used, since the tab raw material is usually in a roll shape, the tab will have a certain amount of arc after the device has finished cutting, which makes it difficult to meet high quality requirements. Therefore, the tab needs to be transported to the shaping equipment for flattening, which is a relatively cumbersome process.

[0006] In the first aspect of the present disclosure, a tab cutting and shaping device is provided, which specifically includes: a conveying body, a servo motor, a shaping lower fixed roller, a shaping upper movable roller, a movable lower pressure frame, a force-bearing strip, an adjusting hand wheel, a supporting rear frame, a lower cutting knife, a lifting knife seat, an upper cutting knife and a double-axis cylinder; a servo motor is installed at the bottom of the conveying body, a shaping lower fixed roller is installed inside the conveying body, and the servo motor is connected to the shaping lower fixed roller in a transmission manner; a shaping upper movable roller is installed inside the conveying body, and the shaping upper movable roller is located directly above the shaping lower fixed roller, and a movable lower pressure frame is connected to the top of the conveying body. A movable lower pressure frame, the two ends of the bottom of the movable lower pressure frame are connected to the upper shaping movable roller; the top of the movable lower pressure frame is connected to a force-bearing strip, the middle part of the force-bearing strip is connected to an adjusting hand wheel, and the top of the conveying body is connected to the movable lower pressure frame and the adjusting hand wheel; a supporting rear frame is installed near the rear end of the top of the conveying body, and a lower cutting knife is installed at the rear of the conveying body; a lifting knife seat is installed outside the supporting rear frame, and an upper cutting knife is connected outside the lifting knife seat, and the upper cutting knife is located on the top of the lower cutting knife; a double-axis cylinder is installed outside the supporting rear frame, and the double-axis cylinder is connected to the lifting knife seat.

[0007] Furthermore, the shaping lower fixed roller is rotatably connected to the conveying body, the top of the shaping lower fixed roller is flush with the conveying plane at the top of the conveying body, a small gear is arranged on the driving shaft of the servo motor, a large gear is arranged at the end of the shaping lower fixed roller, and the small gear is meshed with the large gear for transmission.

[0008] Furthermore, an arched bracket is provided on the top of the conveying body, movable holes are provided on both sides of the arched bracket, the end of the shaping upper movable roller is slidably connected to the movable hole provided in the arched bracket, the movable lower pressure frame is in sliding contact with the arched bracket, and the end of the shaping upper movable roller is rotatably connected to the movable lower pressure frame.

[0009] Furthermore, a vertical stud is provided on the top of the arch bracket, and a guide through hole is provided in the middle of the movable lower pressure frame. The vertical stud passes through the guide through hole provided on the movable lower pressure frame, and the vertical stud and the guide through hole slide together to guide the movement of the movable lower pressure frame.

[0010] Furthermore, the adjusting hand wheel is rotatably connected to the force-bearing strip, a screw hole is provided inside the adjusting hand wheel, and the vertical stud is threadedly connected to the screw hole provided in the adjusting hand wheel.

[0011] Furthermore, vertical guide holes are provided at both ends of the stressed strip, and a vertical guide column is provided on the top of the movable lower pressure frame. The vertical guide column slides through the vertical guide holes provided in the stressed strip, and the vertical guide column and the vertical guide hole slide and cooperate with each other to guide the movement of the stressed strip.

[0012] Furthermore, a spring is mounted on the outside of the vertical guide column of the movable lower pressure frame, the top of the spring contacts the bottom of the stress-bearing strip, and the bottom of the spring contacts the top of the movable lower pressure frame, and the servo motor drives the shaping lower fixed roller to rotate to convey the tab raw material. When the tab raw material passes through the top of the shaping lower fixed roller, the movable lower pressure frame is affected by the thrust of the spring to drive the shaping upper movable roller to move downward, so that the bottom of the shaping upper movable roller contacts the top of the tab raw material, and the tab raw material is rolled flat and shaped. According to the thickness of the tab raw material, the adjusting hand wheel is rotated to drive the stress-bearing strip to move up and down, thereby changing the distance between the stress-bearing strip and the movable lower pressure frame and changing the spring compression ratio, thereby achieving the effect of increasing or decreasing the shaping pressure.

[0013] Furthermore, the lifting knife seat is in sliding contact with the supporting rear frame, a limiting column is arranged on the outside of the supporting rear frame, a sliding hole is arranged on the inside of the lifting knife seat, the limiting column is slidably connected to the sliding hole provided in the lifting knife seat, the end of the limiting column is in contact with the outer side of the lifting knife seat, and the lifting knife seat is limited in up and down movement distance by the limiting column and the sliding hole.

[0014] Furthermore, the cylinder body of the double-axis cylinder is fixedly connected to the supporting rear frame, the piston rod of the double-axis cylinder is fixedly connected to the lifting knife seat, the bottom blade of the upper cutter is in sliding contact with the lower cutter, and when the shaped tab raw material arrives, according to the different lengths of the processed tabs, the double-axis cylinder drives the lifting knife seat to move downward, and the lifting knife seat drives the upper cutter to move synchronously, so that the bottom blade of the upper cutter is in contact with the tab raw material, thereby realizing the cutting operation of tabs of different lengths.

[0015] The present invention provides a tab cutting and shaping device, which has the following beneficial effects: When the present invention is in use, the vertical stud and the guide through hole slide in cooperation, thereby playing a guiding effect on the movement of the movable lower pressure frame, and the vertical guide column and the vertical guide hole slide in cooperation, thereby playing a guiding effect on the movement of the stressed strip plate; the servo motor drives the shaping lower fixed roller to rotate, and the tab raw material is conveyed. When the tab raw material passes through the top of the shaping lower fixed roller, the movable lower pressure frame is influenced by the spring thrust to drive the shaping upper movable roller to move downward, so that the bottom of the shaping upper movable roller contacts the top of the tab raw material, and the tab raw material is rolled flat, thereby playing a shaping effect on the tab raw material and ensuring the flatness of the tab.

[0016] In addition, according to the different thicknesses of the tab raw materials, the adjusting hand wheel can be turned to drive the stressed strip to move up and down, thereby changing the distance between the stressed strip and the movable lower pressure frame. When the stressed strip moves downward, the shaping pressure applied by the shaping upper movable roller on the tab raw materials increases. When the stressed strip moves upward, the shaping pressure applied by the shaping upper movable roller on the tab raw materials decreases, thereby changing the spring compression ratio to achieve the effect of increasing or decreasing the shaping pressure, thereby better satisfying the shaping and flattening effect of tabs of different thicknesses.

[0017] In addition, the limit column and the sliding hole slide in cooperation to limit the up and down movement distance of the lifting knife seat. When the shaped tab raw material reaches the lower cutting knife position, the dual-axis cylinder drives the lifting knife seat to move downward according to the different lengths of the processed tabs, and the lifting knife seat drives the upper cutting knife to move synchronously, so that the bottom blade of the upper cutting knife contacts the tab raw material, thereby realizing the cutting operation of tabs of different lengths.

[0018] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0020] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0021] In the attached picture: Figure 1 The overall front-axle structural schematic diagram of the tab cutting and shaping device of the present application is shown; Figure 2 The overall rear axle side structural schematic diagram of the tab cutting and shaping device of the present application is shown; Figure 3 The overall bottom axis side structure schematic diagram of the tab cutting and shaping device of the present application is shown; Figure 4 A schematic diagram of the connection structure of the conveying body, the servo motor and the shaping lower fixed roller of the tab cutting and shaping device of the present application is shown; Figure 5 A schematic diagram of the connection structure of the shaping upper movable roller, the movable lower pressing frame, the stress-bearing strip, the adjusting hand wheel and the spring of the tab cutting and shaping device of the present application is shown; Figure 6 A schematic diagram of the disassembly structure of the movable lower pressing frame, the stress-bearing strip plate and the adjusting hand wheel of the tab cutting and shaping device of the present application is shown; Figure 7 A schematic diagram of the connection structure of the supporting rear frame, the lifting knife seat, the upper cutting knife and the double-axis cylinder of the tab cutting and shaping device of the present application is shown; Figure 8 A schematic diagram of the split structure of the supporting rear frame, the lifting knife seat and the upper cutting knife of the tab cutting and shaping device of the present application is shown.

[0022] Reference numerals list 1. Conveying body; 101. Arched bracket; 1011. Movable hole; 1012. Vertical stud; 2. Servo motor; 201. Small gear; 3. Shaping lower fixed roller; 301. Large gear; 4. Shaping upper movable roller; 5. Movable lower pressure frame; 501. Guide through hole; 502. Vertical guide column; 6. Force-bearing strip; 601. Vertical guide hole; 7. Adjusting hand wheel; 701. Screw hole; 8. Spring; 9. Support rear frame; 901. Limiting column; 10. Lower cutting knife; 11. Lifting knife seat; 1101. Sliding hole; 12. Upper cutting knife; 13. Double-axis cylinder. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example 1: Please refer to Figures 1 to 8 : The present invention proposes a tab cutting and shaping device, comprising: a conveying body 1, a servo motor 2, a shaping lower fixed roller 3, a shaping upper movable roller 4, a movable lower pressure frame 5, a force-bearing strip plate 6, an adjusting hand wheel 7, a supporting rear frame 9, a lower cutting knife 10, a lifting knife seat 11, an upper cutting knife 12 and a double-axis cylinder 13; a servo motor 2 is installed at the bottom of the conveying body 1, a shaping lower fixed roller 3 is installed inside the conveying body 1, and the servo motor 2 is connected to the shaping lower fixed roller 3 in a transmission manner; a shaping upper movable roller 4 is installed inside the conveying body 1, and the shaping upper movable roller 4 is located directly above the shaping lower fixed roller 3; a movable lower pressure frame 5 is connected to the top of the conveying body 1, and the two ends of the bottom of the movable lower pressure frame 5 are connected to the shaping upper movable roller 4; a force-bearing strip plate 6 is connected to the top of the movable lower pressure frame 5, and an adjusting hand wheel 7 is connected to the middle part of the force-bearing strip plate 6, and the top of the conveying body 1 is connected to the movable lower pressure frame 5 and the adjusting hand wheel 7; a supporting rear frame 9 is installed near the rear end of the top of the conveying body 1, and the conveying body 1 is provided with a lower cutter 10 at the rear; a lifting knife seat 11 is provided on the outside of the supporting rear frame 9, and an upper cutter 12 is connected to the outside of the lifting knife seat 11, and the upper cutter 12 is located at the top of the lower cutter 10; a double-axis cylinder 13 is provided on the outside of the supporting rear frame 9, and the double-axis cylinder 13 is connected to the lifting knife seat 11; the shaping lower fixed roller 3 is rotatably connected with the conveying body 1, and the top of the shaping lower fixed roller 3 is flush with the conveying plane at the top of the conveying body 1, a small gear 201 is provided on the driving shaft of the servo motor 2, and a large gear 301 is provided at the end of the shaping lower fixed roller 3, and the small gear 201 and the large gear 301 are meshed and driven; an arch bracket 101 is provided on the top of the conveying body 1, and movable holes 1011 are provided on both sides of the arch bracket 101, and the end of the shaping upper movable roller 4 is slidably connected in the movable hole 1011 provided in the arch bracket 101, and the movable lower pressing frame 5 is in sliding contact with the arch bracket 101, and the end of the shaping upper movable roller 4 is rotatably connected with the movable lower pressing frame 5.

[0025] In the disclosed embodiment, a vertical stud 1012 is provided at the top of the arch bracket 101, a guide through hole 501 is provided at the middle part of the movable lower pressure frame 5, the vertical stud 1012 passes through the guide through hole 501 provided on the movable lower pressure frame 5, the adjusting hand wheel 7 is rotatably connected with the force-bearing strip 6, a screw hole 701 is provided inside the adjusting hand wheel 7, the vertical stud 1012 is threadedly connected to the screw hole 701 provided on the adjusting hand wheel 7, vertical guide holes 601 are provided at both ends of the force-bearing strip 6, a vertical guide column 502 is provided at the top of the movable lower pressure frame 5, the vertical guide column 502 slides through the vertical guide hole 601 provided on the force-bearing strip 6, the vertical guide column 502 provided on the movable lower pressure frame 5 is provided with a spring 8 on the outside, the top of the spring 8 contacts the bottom of the force-bearing strip 6, and the bottom of the spring 8 contacts the top of the movable lower pressure frame 5; By adopting the above technical solution, the vertical stud 1012 slides with the guide through hole 501 to guide the movement of the movable lower pressure frame 5, and the vertical guide column 502 slides with the vertical guide hole 601 to guide the movement of the force-bearing strip 6; The servo motor 2 drives the shaping lower fixed roller 3 to rotate and transport the tab raw material. When the tab raw material passes through the top of the shaping lower fixed roller 3, the movable lower pressing frame 5 is affected by the thrust of the spring 8 to drive the shaping upper movable roller 4 to move downward, so that the bottom of the shaping upper movable roller 4 contacts the top of the tab raw material, and the tab raw material is rolled flat, which has a shaping effect on the tab raw material and ensures the flatness of the tab. According to the different thicknesses of the tab raw materials, the adjusting hand wheel 7 can be turned, and the adjusting hand wheel 7 drives the stressed strip 6 to move up and down, changing the distance between the stressed strip 6 and the movable lower pressure frame 5. The stressed strip 6 moves downward, and the shaping pressure applied by the shaping upper movable roller 4 on the tab raw materials increases. The stressed strip 6 moves upward, and the shaping pressure applied by the shaping upper movable roller 4 on the tab raw materials decreases, and the compression ratio of the spring 8 is changed to achieve the effect of increasing or decreasing the shaping pressure, so as to better meet the shaping and flattening effect of tabs of different thicknesses.

[0026] In the disclosed embodiment, the lifting knife seat 11 is in sliding contact with the supporting rear frame 9, a limiting column 901 is provided on the outside of the supporting rear frame 9, a sliding hole 1101 is provided inside the lifting knife seat 11, the limiting column 901 is slidably connected in the sliding hole 1101 provided on the lifting knife seat 11, the end of the limiting column 901 is in contact with the outer side of the lifting knife seat 11, the cylinder body of the double-axis cylinder 13 is fixedly connected to the supporting rear frame 9, the piston rod of the double-axis cylinder 13 is fixedly connected to the lifting knife seat 11, and the bottom end of the upper cutting knife 12 is in sliding contact with the lower cutting knife 10; By adopting the above technical solution, the limit column 901 and the sliding hole 1101 are slidably matched to limit the up and down moving distance of the lifting knife seat 11. When the shaped pole ear raw material reaches the position of the lower cutting knife 10, according to the different lengths of the processed pole ears, the dual-axis cylinder 13 drives the lifting knife seat 11 to move downward, and the lifting knife seat 11 drives the upper cutting knife 12 to move synchronously, so that the bottom blade of the upper cutting knife 12 contacts the pole ear raw material, thereby realizing the cutting operation of pole ears of different lengths.

[0027] The working principle of this embodiment is as follows: first, according to the different thicknesses of the tab raw materials, the adjusting hand wheel 7 is turned, and the adjusting hand wheel 7 drives the force strip 6 to move up and down, and changes the distance between the force strip 6 and the movable lower pressure frame 5. The force strip 6 moves downward, and the shaping pressure applied by the shaping upper movable roller 4 on the tab raw materials increases. The force strip 6 moves upward, and the shaping pressure applied by the shaping upper movable roller 4 on the tab raw materials decreases, and the compression ratio of the spring 8 is changed to achieve the effect of increasing or decreasing the shaping pressure; next, the servo motor 2 drives the shaping lower fixed roller 3 to rotate, and the tab raw materials are pressed. During transportation, when the tab material passes through the top of the shaping lower fixed roller 3, the movable lower pressure frame 5 is affected by the thrust of the spring 8 and drives the shaping upper movable roller 4 to move downward, so that the bottom of the shaping upper movable roller 4 contacts the top of the tab material, and the tab material is rolled flat, which has a shaping effect on the tab material; finally, the tab material reaches the position of the lower cutting knife 10, and according to the different lengths of the processed tabs, the double-axis cylinder 13 drives the lifting knife seat 11 to move downward, and the lifting knife seat 11 drives the upper cutting knife 12 to move synchronously, so that the bottom blade of the upper cutting knife 12 contacts the tab material, thereby realizing the cutting operation of tabs of different lengths.

[0028] In this article, there are a few points to note: 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0029] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0030] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A tab cutting and shaping device, comprising: A conveying body (1), a servo motor (2), a shaping lower fixed roller (3), a shaping upper movable roller (4), a movable lower pressure frame (5), a force-bearing strip (6), an adjusting hand wheel (7), a supporting rear frame (9), a lower cutting knife (10), a lifting knife seat (11), an upper cutting knife (12) and a double-axis cylinder (13); characterized in that a servo motor (2) is installed at the bottom of the conveying body (1), a shaping lower fixed roller (3) is installed inside the conveying body (1), and the servo motor (2) is connected to the shaping lower fixed roller (3) by transmission; a shaping upper movable roller (4) is installed inside the conveying body (1), and the shaping upper movable roller (4) is located directly above the shaping lower fixed roller (3); a movable lower pressure frame (5) is connected to the top of the conveying body (1), and the movable lower pressure frame ( 5) The two ends of the bottom are connected to the shaping upper movable roller (4); the top of the movable lower pressure frame (5) is connected to a force-bearing strip (6), the middle part of the force-bearing strip (6) is connected to an adjusting hand wheel (7), and the top of the conveying body (1) is connected to the movable lower pressure frame (5) and the adjusting hand wheel (7); a supporting rear frame (9) is installed near the rear end of the top of the conveying body (1), and a lower cutting knife (10) is installed at the rear of the conveying body (1); a lifting knife seat (11) is installed on the outside of the supporting rear frame (9), and an upper cutting knife (12) is connected to the outside of the lifting knife seat (11), and the upper cutting knife (12) is located on the top of the lower cutting knife (10); a double-axis cylinder (13) is installed on the outside of the supporting rear frame (9), and the double-axis cylinder (13) is connected to the lifting knife seat (11).

2. The tab cutting and shaping device according to claim 1, characterized in that: The shaping lower fixed roller (3) is rotatably connected to the conveying body (1), the top of the shaping lower fixed roller (3) is flush with the conveying plane at the top of the conveying body (1), a small gear (201) is arranged on the driving shaft of the servo motor (2), a large gear (301) is arranged at the end of the shaping lower fixed roller (3), and the small gear (201) and the large gear (301) are meshed for transmission.

3. The terminal ear cutting and shaping device according to claim 1, characterized in that: An arch support (101) is provided on the top of the conveying body (1), movable holes (1011) are provided on both sides of the arch support (101), the end of the shaping upper movable roller (4) is slidably connected to the movable hole (1011) provided in the arch support (101), the movable lower pressing frame (5) is in sliding contact with the arch support (101), and the end of the shaping upper movable roller (4) is rotatably connected to the movable lower pressing frame (5).

4. The tab cutting and shaping device according to claim 1, characterized in that: A vertical stud (1012) is provided at the top of the arch support (101), a guide through hole (501) is provided at the middle of the movable lower pressing frame (5), and the vertical stud (1012) passes through the guide through hole (501) provided on the movable lower pressing frame (5).

5. The terminal ear cutting and shaping device according to claim 1, characterized in that: The adjusting hand wheel (7) is rotatably connected to the force bearing strip plate (6), a screw hole (701) is provided inside the adjusting hand wheel (7), and the vertical stud (1012) is threadedly connected to the screw hole (701) provided in the adjusting hand wheel (7).

6. The terminal ear cutting and shaping device according to claim 1, characterized in that: The two ends of the stress-bearing strip plate (6) are provided with vertical guide holes (601), and the top of the movable lower pressure frame (5) is provided with a vertical guide column (502), and the vertical guide column (502) slides through the vertical guide holes (601) provided on the stress-bearing strip plate (6).

7. The terminal ear cutting and shaping device according to claim 6, characterized in that: The vertical guide column (502) provided on the movable lower pressing frame (5) is sleeved with a spring (8) on the outside, the top of the spring (8) contacts the bottom of the force-bearing strip plate (6), and the bottom of the spring (8) contacts the top of the movable lower pressing frame (5).

8. The tab cutting and shaping device according to claim 1, characterized in that: The lifting knife seat (11) is in sliding contact with the supporting rear frame (9); a limiting column (901) is arranged outside the supporting rear frame (9); a sliding hole (1101) is arranged inside the lifting knife seat (11); the limiting column (901) is slidably connected to the sliding hole (1101) provided in the lifting knife seat (11); and the end of the limiting column (901) is in contact with the outer side of the lifting knife seat (11).

9. The tab cutting and shaping device according to claim 1, characterized in that: The cylinder body of the double-axis cylinder (13) is fixedly connected to the supporting rear frame (9), the piston rod of the double-axis cylinder (13) is fixedly connected to the lifting knife seat (11), and the bottom end blade of the upper cutting knife (12) is in sliding contact with the lower cutting knife (10).

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