High-speed bidirectional flying knife cutting device

Abstract

This invention discloses a high-speed bidirectional flying knife cutting device for winding, comprising a frame, a boom rotation device mounted on the frame, a pressure roller lifting device connected to the power output end of the boom rotation device, a fixed frame fixed to the motion output end of the pressure roller lifting device, a cutting knife device fixed to the fixed frame, a horizontal pressure roller mounted below the boom rotation device on the frame, a cross rotating arm mounted on one side of the frame, a guide roller device mounted on the cross rotating arm, and the center of the cross rotating arm and the axis of the horizontal pressure roller being on the same horizontal plane. This invention's bidirectional flying knife cutting device employs a double-blade outward pulling cutting technology, effectively avoiding the wrinkling problem of single-blade cutting; effectively preventing unilateral stretching deformation of the uncut portion of the film due to increased stress; ensuring the flatness of the bottom of the new roll tube; and improving the product yield.

Description

Technical Field

[0001] This invention belongs to the technical field of precision coating equipment, specifically relating to a high-speed bidirectional flying knife cutting device for winding. Background Technology

[0002] In recent years, the domestic lithium battery aluminum-plastic film industry has been booming, and domestic customers have increasingly higher requirements for coating machines used in the production of lithium battery aluminum-plastic films. Aluminum-plastic film requires extremely high flatness at the bottom of the winding tube; there must be no wrinkles at the bottom. Aluminum-plastic film is a composite film composed of aluminum film and plastic film or nylon material; wrinkles or indentations render it unusable. Currently, when existing lithium battery aluminum-plastic film coating machines are wound and cut, unevenness at the bottom of the winding tube directly leads to indentations on several or even dozens of turns of aluminum-plastic film material, rendering it unusable and causing significant losses and waste. Summary of the Invention

[0003] The purpose of this invention is to provide a high-speed bidirectional flying knife cutting device for winding, which solves the problem of uneven bottom of the winding tube during winding and cutting in existing lithium battery aluminum-plastic film coating machines.

[0004] The technical solution adopted in this invention is: a high-speed bidirectional flying knife cutting device for winding, including a frame, a large arm rotation device installed on the frame, a pressure roller lifting device connected to the power output end of the large arm rotation device, a fixed frame fixed to the motion output end of the pressure roller lifting device, a cutting knife device fixed to the fixed frame, a horizontal pressure roller installed below the large arm rotation device on the frame, a cross rotating arm installed on one side of the frame, a guide roller device installed on the cross rotating arm, and the center of the cross rotating arm and the axis of the horizontal pressure roller being on the same horizontal plane.

[0005] The invention is further characterized by:

[0006] The boom rotation device includes two symmetrically arranged boom cylinders. Both boom cylinders are fixed to the frame via boom cylinder rear supports. The output shafts of both boom cylinders are pin-connected to cylinder swing arms. The ends of the two cylinder swing arms away from the boom cylinders are connected to the cutting boom arms. The cylinder swing arms and the cutting boom arms are fixed together on the same rotation shaft. The end of the cutting boom arm away from the cylinder swing arms is connected to the pressure roller lifting device.

[0007] A cross brace is fixed between the two cutting blade arms.

[0008] The pressure roller lifting device includes a pair of parallel pressure roller cylinders. Each pair of pressure roller cylinders has a connecting support fixedly connected to its output shaft. Both connecting supports are fixedly connected to a fixed frame. The pressure roller cylinders are fixedly connected to the boom rotation device, and the bottom of the connecting supports is connected to the cutting device.

[0009] The mounting bracket is a C-type mounting bracket.

[0010] The cutting device includes a flying knife cylinder fixed to one side of the fixed frame. Two cylinder mounting plates are mounted on the slide of the flying knife cylinder. The two cylinder mounting plates are connected and located on the same plane. The flying knife cylinder drives the two cylinder mounting plates to perform opposite reciprocating motions. Blade cylinders are fixedly connected to the two cylinder mounting plates near the connection point. The output end of the blade cylinder is connected to a blade holder. Blades are fixedly connected to the blade holder. The two blades are located on the same plane. The flying knife cylinder is also connected to an air circuit device.

[0011] One cylinder mounting plate has a V-groove at one end, and the other cylinder mounting plate has a V-shaped platform that matches the V-groove.

[0012] The cutting device also includes a guide roller connecting plate. A guide roller fixing plate is provided at the bottom of the guide roller connecting plate. The guide roller fixing plate and the guide roller connecting plate are connected by a shoulder screw, and a spring is sleeved on the shoulder screw. A pressure roller and a guide roller are fixedly connected in parallel between the two guide roller fixing plates along the material film conveying direction. Two blades are located between the pressure roller and the guide roller and are parallel to the pressure roller and the guide roller. The blade tip position is not lower than the lowest point of the guide roller and the pressure roller. The guide roller connecting plate is fixedly connected to the pressure roller lifting device.

[0013] The guide roller device includes guide rollers set at both ends of the vertical arm of the cross rotating arm and air expansion shafts set at both ends of the horizontal arm of the cross rotating arm. When the cutting device rotates to the working position, the pressure roller is located directly above the air expansion shaft at the end of the horizontal arm near the horizontal pressure roller and abuts against the air expansion shaft.

[0014] The air circuit device includes an air tank. The flying knife cylinder is connected to the air tank through a triplet. The air tank is connected to the main air circuit through an air circuit. A pressure boosting valve and an oil mist filter are sequentially installed on the air circuit connecting the air tank and the main air circuit. The triplet is connected to the head air port and the tail air port of the flying knife cylinder through an air circuit. A solenoid valve a is installed on the air circuit connecting the head air port and the triplet. A solenoid valve b is installed on the air circuit connecting the tail air port and the triplet.

[0015] The beneficial effects of this invention are:

[0016] 1. The high-speed bidirectional flying knife cutting device of the present invention adopts double-blade outward pulling cutting technology, which can effectively avoid the wrinkling problem of single-blade cutting;

[0017] 2. The high-speed bidirectional flying knife cutting device of the present invention maintains the width of the uncut part of the film on both sides at all times during the double-knife outward pulling cutting process, effectively avoiding the unilateral stretching deformation of the uncut part of the film due to increased stress.

[0018] 3. The high-speed bidirectional flying knife cutting device of the present invention divides the cutting action into multiple steps, effectively reducing the hole that the knife punctures the aluminum-plastic film, ensuring that there is no edge flipping at the opening, and ensuring the flatness of the bottom of the new rolled tube.

[0019] 4. The high-speed bidirectional flying knife cutting device of the present invention has a double cutting knife cutting time that is half that of a single cutting knife, ensuring that the film is cut in a very short time.

[0020] 5. The high-speed bidirectional flying knife cutting device of the present invention is equipped with a high-pressure high-speed air circuit device, which effectively reduces the cutting time of the film and reduces the length of the zero-speed receiving and storage rack, thus saving costs; the high-pressure air circuit can also provide a large thrust to the cutting knife to meet the cutting requirements of thick materials.

[0021] 6. In the high-speed bidirectional flying knife cutting device of the present invention, the spring device inside the cutting device plays a buffering role when the pressure roller contacts the material film, so as to avoid stretching of the aluminum-plastic film caused by the asynchronous movement of the two sides of the upper arm during the falling process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the high-speed bidirectional flying knife cutting device for winding according to the present invention;

[0023] Figure 2 This is a structural diagram of the pressure roller lifting device in the high-speed bidirectional flying knife cutting device of the present invention;

[0024] Figure 3 This is a structural diagram of the boom rotation device in the high-speed bidirectional flying knife cutting device of the present invention;

[0025] Figure 4 This is a structural diagram of the cylinder mounting plate in the high-speed bidirectional flying knife cutting device of the present invention;

[0026] Figure 5 This is a structural diagram of the cutting device in the high-speed bidirectional flying knife cutting device of the present invention;

[0027] Figure 6 This is a schematic diagram of the air path in the high-speed bidirectional flying knife cutting device of the present invention;

[0028] Figure 7 This is a schematic diagram of the boom of the high-speed bidirectional flying knife cutting device of the present invention after it has descended;

[0029] Figure 8 This is a schematic diagram of the high-speed bidirectional flying knife cutting device of the present invention after the pressure roller is pressed down;

[0030] Figure 9 This is a schematic diagram of the blade of the high-speed bidirectional flying knife cutting device of the present invention after being pressed down.

[0031] In the diagram, 1. Frame, 2. Boom rotation device, 3. Pressure roller lifting device, 4. Cutting device, 5. Horizontal pressure roller, 6. Guide roller device, 7. Boom cylinder rear support, 8. Boom cylinder, 9. Cylinder swing arm, 10. Cutting arm, 11. Pressure roller cylinder, 12. Connecting support, 13. Fixing frame, 14. Cross brace, 15. Flying knife cylinder, 16. V-groove, 17. Cylinder mounting plate, 18. Blade cylinder, 19. Guide roller connecting plate, 20. Guide roller fixing plate, 21. Guide roller, 22. Shoulder screw, 23. Blade holder, 24. Blade, 25. Pressure roller, 26. Spring, 27. Oil mist filter, 28. Pressure booster valve, 29. Air tank, 30. Tri-unit, 31. Solenoid valve a, 32. Solenoid valve b. Detailed Implementation

[0032] The present invention will now be described in detail with reference to specific embodiments.

[0033] The high-speed bidirectional flying knife cutting device for winding of the present invention has the following structure: Figure 1 As shown, the machine includes a frame 1, on which a boom rotation device 2, a horizontal pressure roller 5, and a guide roller 6 are mounted. The boom rotation device 2 is connected to a pressure roller lifting device 3, which is connected to a C-shaped fixing frame 13. A cutting device 4 is fixedly connected to the inner side of the C-shaped fixing frame 13, completing the entire high-speed bidirectional flying knife automatic cutting action, ensuring the neatness of the material film cutting, improving the flying knife running speed, and reducing cutting time. The horizontal pressure roller 5 is mounted on the frame 1 via a linear slide rail. A cross rotating arm is fixedly connected to one side of the frame 1 at the horizontal pressure roller 5. The axis of the horizontal pressure roller 5 and the center of the cross rotating arm are on the same horizontal plane. The cross rotating arm can rotate 360 ​​degrees. The guide roller device 6 includes guide rollers screwed to both ends of the vertical arm of the cross rotating arm and air shafts set at both ends of the horizontal arm of the cross rotating arm. The boom rotation device 2 controls the rotation of the cutting device 4 to reach the working position and to leave the working position. Figure 8 and Figure 9 As shown, when the cutting device 4 reaches the working position, the pressure roller 25 is located directly above the air expansion shaft at the left end of the horizontal wall of the cross rotating wall and abuts against the air expansion shaft before the cutting work is carried out.

[0034] like Figure 1 As shown, the boom rotation device 2 includes two boom cylinder rear supports 7 symmetrically arranged on the frame 1. Each boom cylinder rear support 7 is equipped with a boom cylinder 8. The output shafts of the boom cylinder 8 are connected to the cylinder swing arm 9 via pins. The cylinder swing arm 9 and the cutting blade boom 10 are fixed together on the same rotation axis. Figure 3 As shown, the two ends of the cross brace 14 are fixed to the two cutting blade arms 10 by screws respectively. The two cutting blade arms 10 are fixed into a whole by the cross brace 14. The cutting blade arms 10 are rotated by the extension and retraction of the output shaft of the arm cylinder 8, so that the cutting blades can rotate to the working position and move out of the working position.

[0035] like Figure 2 As shown, the pressure roller lifting device 3 includes a pressure roller cylinder 11, which is mounted on the cutting blade arm 10 by screws. The connecting support 12 is connected to the output shaft of the pressure roller cylinder 11 by screws. The C-shaped fixing frame 13 is mounted on one side of the connecting support 12 by screws. The extension and retraction of the output shaft of the pressure roller cylinder 11 can drive the C-shaped fixing frame 13 to rise and fall.

[0036] like Figure 5 As shown, the cutting device 4 includes a flying knife cylinder 15, which is fixed to a C-shaped bracket 13 by screws. Two cylinder mounting plates 17 are screwed onto the slide of the flying knife cylinder 15. Each of the two cylinder mounting plates 17 is equipped with a blade cylinder 18. The output end of the blade cylinder 18 is connected to a blade holder 23, and a blade 24 is fixedly attached to the blade holder 23. The blade 24 is lifted and lowered by the blade cylinder 18 to cut the material film. Figure 4 As shown, the two cylinder mounting plates 17 are provided with matching V-grooves 16 and V-shaped platforms at the connection point. The two cylinder mounting plates 17 are positioned by the cooperation of the V-grooves 16 and V-shaped platforms to ensure that the left and right blades 24 are on the same plane when they are in the initial position. This can avoid problems such as excessively large holes and uneven edges caused by the two blades 24 being uneven when the blades 24 are pressed down to puncture the material film.

[0037] like Figure 5 As shown, the cutting device 4 also includes a guide roller connecting plate 19, which is fixed to the bottom of the connecting support 12 in the pressure roller lifting device 3 by screws. The guide roller fixing plate 20 is fixed to the guide roller connecting plate 19 by shoulder screws 22, and the spring 26 is sleeved on the shoulder screws 22. The pressure roller 25 and the guide roller 21 are arranged sequentially between the two guide roller fixing plates 20 along the material film conveying direction. The pressure roller 25 and the guide roller 21 are parallel and both ends are fixed on the two guide roller fixing plates 20 respectively. The two blades 24 are located between the pressure roller 25 and the guide roller 21 and are parallel to the pressure roller 25 and the guide roller 21. When the guide roller 21 and the pressure roller 25 are subjected to pressure, the spring 26 will be compressed through the guide roller fixing plate 20. The entire cutting device 4 can be raised and lowered by the pressure roller cylinder 11 in the pressure roller lifting device 3. When the cutting device 4 falls to the working position through the pressure roller cylinder 11, the guide roller 21 and pressure roller 25 will contact the material film, while the two blades 24 will not. When the material film squeezes the guide roller 21 and pressure roller 25, it drives the two guide roller fixing plates 20 to press the spring 26 upward, and the guide roller 21 and pressure roller 25 will rise slightly. Because the pressure roller cylinders 11 on both sides cannot fall completely synchronously, the spring 26 will also play a buffering role to prevent the material film from being stretched and deformed due to uneven force.

[0038] The guide roller 21 and pressure roller 25 contact the film in advance. Conventional equipment only has one roller, pressure roller 25. As a result, the blade 24 will puncture the film during the rotation of the cutting arm 10 or the descent of the pressure roller lifting device 3. This will cause the film to have larger holes. After the holes are punctured, the edges will turn up, causing wrinkles at the bottom of the winding tube. This will result in several or even dozens of turns of aluminum-plastic film material at the bottom of the tube being indented and unusable, causing great losses and waste.

[0039] When the cutting device 4 starts working, the two flying knife cylinders 15 drive the extension and retraction ends of the blade cylinders 18 on the cylinder mounting plate 17 to press down the two blades 24. The two flying knife cylinders 15 then drive the cylinder mounting plate 17 to move from the center to both sides, thereby moving the two blades 24 from the center of the film to both ends of the film. This can effectively avoid the wrinkling problem of cutting with a single blade 24. During the outward pulling cutting process of the two blades 24, the width of the uncut part of the film on both sides is kept equal at all times, effectively preventing the uncut part of the film from being stretched and deformed on one side due to increased stress. The outward pulling cutting time of the two blades 24 is half that of a single cutter, ensuring that the film is cut in a very short time, which can reduce the length of the zero-speed winding and receiving storage rack.

[0040] like Figure 6 As shown, the flying knife cylinder 15 is also connected to an air circuit device, including a main air circuit. The main air circuit sequentially connects to an oil mist filter 27, a pressure boosting valve 28, an air tank 29, and a triplet 30. Solenoid valves a31 and b32 are installed near the air ports at the head and tail of the flying knife cylinder 15, respectively. The head air port connects to solenoid valve a31 and the triplet 30, while the tail air port connects to solenoid valve b32 and the triplet 30. This allows air to enter the flying knife cylinder 15 at one end, while the other end's air port directly connects to the atmosphere, avoiding the need for exhaust through a section of air pipe at the other end. Impeded exhaust creates resistance, hindering the sliding of the flying knife cylinder 15 from moving from one end to the other. The maximum air pressure in conventional equipment is 0.6 MPa, which is insufficient to reach the maximum operating pressure of the cylinder and thus the maximum speed. The pressure boosting valve 28 in the air circuit can increase the maximum cylinder pressure to 1 MPa, increasing the thrust generated by the cylinder. High-pressure, high-speed air circuit effectively reduces film cutting time and shortens the length of the zero-speed reel for winding, saving costs.

[0041] The working process of the high-speed bidirectional flying knife cutting device of this invention is as follows: When performing bidirectional flying knife cutting on the film, such as... Figure 7 As shown, the output shaft of the boom cylinder 8 is connected to the cylinder swing arm 9 via a pin. The cylinder swing arm 9 and the cutting boom 10 are fixed on the same rotating shaft. The extension and retraction of the output shaft of the boom cylinder 8 controls the rotation of the cutting boom 10. The cutting device 4 is installed on the cutting boom 10. The cutting device 4 is driven by the boom cylinder 8 to rotate and fall to the working position. At this time, the tip of the blade 24 is still above the lowest point of the guide roller 21 and the pressure roller 25, and the blade 24 cannot yet contact the material film; Figure 8 As shown, the output shaft of the pressure roller cylinder 11 in the pressure roller lifting device 3 extends, driving the cutting device 4 to press vertically downwards, causing the pressure roller 25 in the cutting device 4 to press onto the paper core. During the downward pressing process, the guide roller 21 and the pressure roller 25 will contact the paper film. When the paper film squeezes the guide roller 21 and the spring 26 of the pressure roller 25, the guide roller 21 and the pressure roller 25 will rise slightly. Because the pressure roller cylinders 11 on both sides cannot fall completely synchronously, the spring 26 also plays a buffering role to prevent the paper film from being stretched and deformed due to uneven force. Figure 9 As shown, the blade 24 extends through the output shaft of the blade cylinder 18 and presses down vertically to puncture the material film; finally, the blade 24 is driven by the flying knife cylinder 15 to fly from the middle of the material film to both ends and cut the material film.

[0042] The working process of the air circuit includes: oil mist filter 27, pressure booster valve 28, air tank 29, triplet 30, solenoid valve one 31, solenoid valve two 32, and fly knife cylinder 15. Figure 6 As shown in the diagram, the components are connected via air pipes according to the air circuit schematic. Compressed air is first filtered through an oil mist filter 27. The filtered air then passes through a booster valve 28, increasing the compressed air pressure from 0.6 MPa to 1 MPa. This high-pressure air is stored in an air tank 29 to prevent insufficient high-pressure air supply when the fly knife cylinder 15 operates. The high-pressure air then passes through a triplet 30, which filters the air and adjusts the air pressure entering the fly knife cylinder 15. Solenoid valves a31 and b32 are installed near the head and tail air ports of the fly knife cylinder 15, respectively. The program controls whether solenoid valves a31 or b32 are for air intake or exhaust. When the fly knife cylinder 15 drives the blade 24 to cut the material film, solenoid valve a31 controls the intake of air into the fly knife cylinder 15, while solenoid valve b32 simultaneously controls the exhaust of air from the fly knife cylinder 15; both solenoid valves operate simultaneously.

[0043] The working principle of the high-speed bidirectional flying knife cutting device of the present invention is as follows: After the old roll is fully wound, the film needs to be cut and attached to the new paper core for continued winding. The cutting arm 10 drives the entire cutting device 4 to rotate and fall through the arm cylinder 8. The blade 24 is located between the guide roller 21 and the pressure roller 25 and is higher than the lowest point of the guide roller 21 and the pressure roller 25. This avoids the blade 24 prematurely contacting and puncturing the film during the rotation of the cutting arm 10 or the descent of the pressure roller lifting device 3. Since the blade 24 also rotates with the cutting arm 10, the size and regularity of the hole in the film are uncontrollable. After the hole is punctured, the film will flip up, causing wrinkles at the bottom of the winding tube. This results in several or even dozens of circles of aluminum-plastic film material at the bottom of the tube being indented and unusable, causing great loss and waste. The new high-speed bidirectional flying knife cutting device ensures that the cut surface of the film is neat and flat when attached to the new paper core. The blade 24 is pressed down by the blade cylinder 18 to puncture the film, and then the air circuit controls the flying knife cylinder 15 to drive the blade 24 from the middle of the film to both ends to cut the film. During the outward pulling cutting process of the two blades 24, the width of the uncut part of the film on both sides is kept equal at all times, which effectively avoids the uncut part of the film from being stretched and deformed on one side due to increased stress. The outward pulling cutting time of the two blades 24 is half that of the single cutting blade, which effectively reduces the film cutting time, reduces the length of the zero-speed winding and receiving storage rack, and saves costs.

[0044] Working principle of the air circuit: The maximum air pressure in conventional equipment is 0.6 MPa, which is insufficient to reach the maximum pressure required for the cylinder to achieve maximum speed. The booster valve 28 in the air circuit can increase the maximum cylinder pressure to 1 MPa. This increased pressure also increases the thrust generated by the cylinder, allowing for increased operating speed in the flying knife cylinder 15. Solenoid valves a31 and b32 are installed near the head and tail air ports of the flying knife cylinder 15, respectively. This allows air to enter from one end of the flying knife cylinder 15 while the exhaust port at the other end directly connects to the atmosphere through the solenoid valve outlet. This avoids the need for exhaust through a section of air pipe at the other end, which would create resistance and hinder the movement of the flying knife cylinder 15 slide from one end to the other. This high-pressure, high-speed air circuit effectively reduces film cutting time, shortens the length of the zero-speed take-up and storage rack, and saves costs.

Claims

1. A high-speed bidirectional flying knife cutting device for winding, characterized in that, Includes a frame (1), on which a boom rotation device (2) is installed, the power output end of the boom rotation device (2) is connected to a pressure roller lifting device (3), the motion output end of the pressure roller lifting device (3) is fixedly connected to a fixed frame (13), a cutter device (4) is fixedly connected to the fixed frame (13), a horizontal pressure roller (5) is installed below the boom rotation device (2) on the frame (1), a cross rotating arm is installed on one side of the frame (1), a guide roller device (6) is installed on the cross rotating arm, and the center of the cross rotating arm and the axis of the horizontal pressure roller (5) are on the same horizontal plane; The pressure roller lifting device (3) includes a pair of parallel pressure roller cylinders (11). Each pair of pressure roller cylinders (11) has a connecting support (12) fixedly connected to its output shaft. Both connecting supports (12) are fixedly connected to the fixed frame (13). The pressure roller cylinders (11) are fixedly connected to the boom rotation device (2). The bottom of the connecting support (12) is connected to the cutting device (4). The cutting device (4) includes a flying knife cylinder (15) fixed to one side of the fixed frame (13). Two cylinder mounting plates (17) are installed on the slide of the flying knife cylinder (15). The two cylinder mounting plates (17) are connected and located on the same plane. The flying knife cylinder (15) drives the two cylinder mounting plates (17) to perform opposite reciprocating motions. Blade cylinders (18) are fixedly connected to the two cylinder mounting plates (17) near the connection point. The output end of the blade cylinder (18) is connected to a blade holder (23). Blade (24) is fixedly connected to the blade holder (23). The two blades (24) are located on the same plane. The flying knife cylinder (15) is also connected to an air circuit device.

2. The high-speed bidirectional flying knife cutting device according to claim 1, characterized in that, The boom rotation device (2) includes two symmetrically arranged boom cylinders (8). Both boom cylinders (8) are fixed on the frame (1) by boom cylinder rear support (7). The output shafts of the two boom cylinders (8) are pin-connected to cylinder swing arms (9). The ends of the two cylinder swing arms (9) away from the boom cylinders (8) are connected to cutting blade arms (10). The cylinder swing arms (9) and cutting blade arms (10) are fixed together on the same rotation shaft. The end of the cutting blade arms (10) away from the cylinder swing arms (9) is connected to the pressure roller lifting device (3).

3. The high-speed bidirectional flying knife cutting device according to claim 2, characterized in that, A cross brace (14) is fixed between the two cutting blade arms (10).

4. The high-speed bidirectional flying knife cutting device according to claim 1, characterized in that, The fixing frame (13) is a C-type fixing frame.

5. The high-speed bidirectional flying knife cutting device according to claim 1, characterized in that, One of the cylinder mounting plates (17) has a V-groove (16) at one end, and the other cylinder mounting plate (17) has a V-shaped platform that matches the V-groove (16).

6. The high-speed bidirectional flying knife cutting device according to claim 1, characterized in that, The cutting device (4) also includes a guide roller connecting plate (19). A guide roller fixing plate (20) is provided at the bottom of the guide roller connecting plate (19). The guide roller fixing plate (20) and the guide roller connecting plate (19) are connected by a shoulder screw (22), and a spring (26) is sleeved on the shoulder screw (22). A pressure roller (25) and a guide roller (21) are fixedly connected in parallel between the two guide roller fixing plates (20) along the material film conveying direction. Two blades (24) are located between the pressure roller (25) and the guide roller (21) and are parallel to the pressure roller (25) and the guide roller (21). The blade tip position of the two blades (24) is not lower than the lowest point of the guide roller (21) and the pressure roller (25). The guide roller connecting plate (19) is fixedly connected to the pressure roller lifting device (3).

7. The high-speed bidirectional flying knife cutting device according to claim 6, characterized in that, The guide roller device (6) includes guide rollers at both ends of the vertical arm of the cross rotating arm and air expansion shafts at both ends of the horizontal arm of the cross rotating arm. When the cutting device (4) rotates to the working position, the pressure roller (25) is located directly above the air expansion shaft at the end of the horizontal arm near the horizontal pressure roller (5) and abuts against the air expansion shaft.

8. The high-speed bidirectional flying knife cutting device for winding according to claim 1, characterized in that, The air circuit device includes an air tank (29). The flying knife cylinder (15) is connected to the air tank (29) through a triplet (30). The air tank (29) is connected to the main air circuit through an air circuit. A booster valve (28) and an oil mist filter (27) are sequentially arranged on the air circuit connecting the air tank (29) and the main air circuit. The triplet (30) is connected to the head air port and the tail air port of the flying knife cylinder (15) through an air circuit. A solenoid valve a (31) is arranged on the air circuit connecting the head air port and the triplet (30). A solenoid valve b (32) is arranged on the air circuit connecting the tail air port and the triplet (30).

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