Film cutting device

Abstract

The present invention relates to a film material slitting device, in which a material belt of the film material enters a feeding mechanism at a constant speed and is fed in a preset direction driven by a conveyor belt. Then, the transfer mechanism gradually accelerates, while the conveyor belt decelerates synchronously until the conveyor belt is stationary relative to a frame. At this time, the cutting mechanism, the conveyor belt and the material belt are relatively stationary, and the cutting mechanism performs a cutting action to obtain a sheet of film material. After completing one slitting, the transfer mechanism drives the feeding mechanism to reset, and the conveyor belt speed is restored to an initial state, ready for the next slitting. In the above process, the combined speed of the moving speed of the frame and the feeding speed of the conveyor belt remains unchanged, so the material belt can always maintain a constant speed feed. Moreover, since the cutting mechanism, the conveyor belt and the material belt are relatively stationary when the cutting action is performed, the cutting position is relatively stationary with the conveyor belt, which is conducive to improving the stability of the cutting process, thereby improving the cutting accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of automated processing, and in particular to a film material slitting device. Background Art

[0002] During the production and processing, it is often necessary to cut the strip or roll membrane into membrane sheets. For example, in the production and processing of fuel cells, it is necessary to first cut the bonded MEA (Membrane Electrode Assemblies) strip into sheets. In order to improve efficiency, MEA bonding is generally done by roller pressing. Since roller pressing is a continuous operation, the MEA cannot stay on the hot pressing roller for too long, so the bonded strip needs to be continuously transported forward.

[0003] Therefore, when slitting the MEA strip, a follow-up slitting device is required. The common follow-up slitting device uses a conveyor belt to receive the MEA strip after roller pressing and convey it to the cutter. The cutter moves in sync with the conveyor belt to cut. After cutting, the cutter returns to the origin and performs a periodic cycle. The sheet MEA obtained by slitting will be placed on the next conveyor belt to transport the sheet MEA out.

[0004] During the follow-up cutting process, although the material belt and the cutter are relatively stationary, the conveyor belt is still running, so the cutting point is moving relative to the conveyor belt. In this way, the stability of the cutting process will be affected, resulting in low cutting accuracy. Summary of the invention

[0005] Based on this, it is necessary to provide a film material slitting device that can improve the cutting accuracy in order to solve the problem that the existing slitting device has low cutting accuracy.

[0006] A film material slitting device, comprising:

[0007] Transfer mechanism;

[0008] A feeding mechanism, comprising a frame and a conveyor belt, wherein the frame is mounted on the transfer mechanism and is movable along a preset direction under the drive of the transfer mechanism, a cutting station is provided on the frame, and the conveyor belt is mounted on the frame and is used to transport the film material along the preset direction; and

[0009] The cutting mechanism is arranged at the cutting station to cut the film material passing through the cutting station, and the cutting mechanism can move synchronously with the feeding mechanism along the preset direction.

[0010] In one embodiment, the transfer mechanism includes a slide rail and a linear motor, the frame is slidably mounted on the slide rail, and the driving end of the linear motor is transmission-connected to the frame.

[0011] In one embodiment, the conveyor belt includes a belt and a plurality of rollers, the belt is sleeved on the plurality of rollers and tensioned, and the belt forms a feed section and a discharge section spaced apart from each other under the guidance of the plurality of rollers, and the gap between the feed section and the discharge section is opposite to the cutting station.

[0012] In one of the embodiments, the conveyor belt further includes a destaticizing brush fixed to the frame, and the belt passes through the destaticizing brush.

[0013] In one embodiment, the conveyor belt is a vacuum conveyor belt.

[0014] In one embodiment, the cutting mechanism is fixed to the frame.

[0015] In one embodiment, the cutting mechanism includes a bracket, a cutter and a driving member, the cutter extends in a direction perpendicular to the feeding direction of the conveyor belt, and the driving member can drive the cutter to rise and fall in a direction perpendicular to the surface of the conveyor belt.

[0016] In one embodiment, the cutting mechanism further includes a mounting plate and a pressing plate, the cutter is fixed to the mounting plate, the pressing plates are distributed on both sides of the cutter and are mounted on the mounting plate through elastic members, and when the elastic members are in a natural state, the cutter retracts into a gap formed by the pressing plates on both sides.

[0017] In one embodiment, the cutting mechanism further includes a balancing cylinder, two ends of which are respectively connected to the bracket and the mounting plate, and provide a pulling force to the mounting plate.

[0018] In one embodiment, the cutting mechanism further includes an eccentric shaft, the driving member is a motor, the cutter is mounted on the eccentric shaft, and the eccentric shaft is drivingly connected to a rotating shaft of the motor.

[0019] In the above-mentioned film material slitting device, the material belt of the film material enters the feeding mechanism at a constant speed, and is fed in a preset direction driven by the conveyor belt. Then, the transfer mechanism gradually accelerates, and the conveyor belt decelerates synchronously until the conveyor belt is stationary relative to the frame. At this time, the cutting mechanism, the conveyor belt and the material belt are relatively stationary, and the cutting mechanism performs the cutting action to obtain the sheet of film material. After completing one slitting, the transfer mechanism drives the feeding mechanism to reset, and the conveyor belt speed returns to the initial state, ready to perform the next slitting. In the above process, the combined speed of the moving speed of the frame and the feeding speed of the conveyor belt remains unchanged, so the material belt can always maintain a constant speed feed. Moreover, since the cutting mechanism, the conveyor belt and the material belt are relatively stationary when the cutting action is performed, the cutting position is relatively stationary with the conveyor belt, which is conducive to improving the stability of the cutting process, thereby improving the cutting accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a front view of the film material slitting device in a preferred embodiment of the present invention;

[0022] Figure 2 for Figure 1 A side view of the cutting mechanism in the film slitting device shown. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0029] See also Figure 1 The film slitting device 10 in the preferred embodiment of the present invention includes a transfer mechanism 100 , a feeding mechanism 200 and a cutting mechanism 300 .

[0030] The transfer mechanism 100 supports and drives the feeding mechanism 200 and the cutting mechanism 300 to move along a preset direction. Specifically in this embodiment, the transfer mechanism 100 includes a slide rail 110 and a linear motor 120. The feeding mechanism 200 and the cutting mechanism 300 can be slidably mounted on the slide rail 110 through a slider, and the linear motor 120 is used to provide a driving force, so that the driving action can be performed faster and more stably.

[0031] It should be noted that in other embodiments, the transfer mechanism 100 may also be driven in other ways, such as a motor combined with a ball screw pair structure, a cylinder, etc.

[0032] The feeding mechanism 200 includes a frame 210 and a conveyor belt 220. The frame 210 is mounted on the transfer mechanism 100 and can move along a preset direction under the drive of the transfer mechanism 100. Specifically, the frame 210 can be slidably mounted on the slide rail 110, and the driving end of the linear motor 120 is transmission-connected to the frame 210. The installation of the slide rail 110 can reduce the friction force to which the feeding mechanism 200 is subjected during the movement, thereby ensuring its smooth movement.

[0033] The conveyor belt 220 is installed on the frame 210 and is used to convey the film material along a preset direction. The film material can be a single layer or composite film material such as a plastic film, a proton film, an MEA film, etc. that needs to be cut. The feeding direction of the conveyor belt 220 is consistent with the moving direction of the feeding mechanism 200. Figure 1 As shown in the example, the preset direction refers to the horizontal direction.

[0034] Specifically, in this embodiment, the conveyor belt 220 is used to convey both the strip material to be cut and the sheet material after cutting. In this way, the synchronous feeding of the strip material and the sheet material can be ensured, thereby preventing the strip material from slipping or wrinkling on the surface of the conveyor belt 220, which is conducive to improving the quality of the sheet material obtained by cutting. In other embodiments, two sets of conveyor belts can be used to convey the strip material and the sheet material respectively. Moreover, the feeding directions of the two sets of conveyor belts are consistent and need to be kept synchronous.

[0035] The frame 210 can be made of metal plates and frames, and supports the entire feeding mechanism 200. A cutting station is provided on the frame 210. The cutting mechanism 300 is provided at the cutting station to cut the film material passing through the cutting station. The conveyor belt 220 can drive the belt material through the cutting station, and the cutting mechanism 300 cuts the sheet material. Moreover, the cutting mechanism 300 can move synchronously with the feeding mechanism 200 along a preset direction. In other words, the relative position of the cutting mechanism 300 and the feeding mechanism 200 always remains unchanged.

[0036] The cutting mechanism 300 can be directly mounted on the feeding mechanism 200, or mounted on the transfer mechanism 100, and driven synchronously by the transfer mechanism 100. Specifically, in this embodiment, the cutting mechanism 300 is fixed to the frame 210. In this way, the cutting mechanism 300 will move with the movement of the feeding mechanism 200, so as to maintain a high degree of synchronization with the feeding mechanism 200.

[0037] Among them, the combined speed of the moving speed of the feeding mechanism 200 and the feeding speed of the conveyor belt 220 can be kept constant. The feeding speed of the conveyor belt 220 refers to the speed of the conveyor belt 220 relative to the frame 210. Since the feeding mechanism 200 is movable as a whole, and the conveyor belt 220 can be fed at the same time. Therefore, the actual feeding speed of the belt material is the combined speed of the moving speed of the feeding mechanism 200 and the feeding speed of the conveyor belt 220. During the processing, the belt material needs to be fed at a constant speed all the time. Therefore, by synchronously controlling the moving speed of the feeding mechanism 200 and the feeding speed of the conveyor belt 220, the combined speed of the two can be kept constant, thereby ensuring that the material is fed at a constant speed.

[0038] The working process of the above-mentioned film slitting device 10 is roughly divided into the following stages:

[0039] Stage 1: The feeding mechanism 200 is located at the initial position, the film material belt enters the conveyor belt 220 from the feeding end, and the conveyor belt 220 feeds at a constant speed;

[0040] Stage 2: The transfer mechanism 100 drives the feeding mechanism 200 to gradually accelerate, while the conveyor belt 220 decelerates synchronously until the conveyor belt 220 is stationary relative to the frame 210. That is, the feeding speed of the conveyor belt 220 drops to 0, while the moving speed of the feeding mechanism 200 reaches the above-mentioned constant speed. At this time, the cutting mechanism 300, the conveyor belt 220 and the material belt are relatively stationary;

[0041] Stage 3: The cutting mechanism 300 performs the cutting action to obtain the film sheet, and the sheet is output from the discharging end. Since the cutting mechanism 300, the conveyor belt 220 and the material belt are relatively stationary during the cutting action, the cutting position is relatively stationary with respect to the conveyor belt 220, which is conducive to improving the stability of the cutting process, thereby improving the cutting accuracy;

[0042] Stage 4: The transfer mechanism 100 drives the feeding mechanism 200 to first decelerate, then accelerate in the reverse direction, then decelerate to 0 and return to the initial position. During this process, the feeding speed of the conveyor belt 220 is synchronously accelerated, then accelerated, then decelerated and restored to the above-mentioned constant speed. In the above process, the combined speed of the moving speed of the frame 210 and the feeding speed of the conveyor belt 220 remains unchanged, so the material belt can always maintain a constant speed feed.

[0043] By repeating the second, third and fourth steps, the strip film material can be continuously cut into sheets.

[0044] In this embodiment, the conveyor belt 220 includes a belt 221 and multiple rollers 223. The belt 221 is sleeved on the multiple rollers 223 and tensioned. Under the guidance of the multiple rollers 223, the belt 221 forms a feed section 2212 and a discharge section 2214 that are spaced apart from each other. The gap between the feed section 2212 and the discharge section 2214 is opposite to the cutting station.

[0045] Some of the multiple rollers 223 are used to drive the belt 221 to rotate, and some are used to tension the belt 221. The multiple rollers 223 are arranged according to preset positions, so that the belt 221 extends according to the preset path to obtain the feed section 2212 and the discharge section 2214. The feed section 2212 is used to carry and convey the belt material, while the discharge section 2214 is used to carry and convey the sheet material. Since the feed section 2212 and the discharge section 2214 are just different areas on the same belt 221. Therefore, the feed section 2212 and the discharge section 2214 can maintain complete synchronization.

[0046] Moreover, when the cutting mechanism 300 performs the cutting action, the gap between the feed section 2212 and the discharge section 2214 can form a clearance for the cutting mechanism 300, thereby helping to quickly cut off the belt material. At the same time, the cutting mechanism 300 can also be prevented from damaging the belt 221.

[0047] It should be noted that in other embodiments, the feed section 2212 and the discharge section 2214 may be distributed on the same belt extending in the horizontal direction and there may be no gap between them. Moreover, a protective coating may be provided on the surface of the belt to provide a substrate for the cutting action of the cutting mechanism 300, which can also ensure that the cutting action is completed smoothly.

[0048] Furthermore, in the present embodiment, the conveyor belt 220 further includes a destaticizing brush 225 fixed to the frame 210 , and the belt 221 passes through the destaticizing brush 225 .

[0049] Specifically, during the continuous operation of the belt 221, static electricity is generated due to the continuous friction with the film material. Under the adsorption of static electricity, the belt material on the belt 221 is prone to wrinkles. Moreover, after the static electricity is transmitted to the belt material, the various regions of the belt material attract each other, resulting in the belt material not being able to be spread out flat. Moreover, the cut sheets may also be unable to be smoothly separated from the belt 221 and discharged due to the adsorption of static electricity.

[0050] When the belt 221 passes through the anti-static brush 225, various areas of the belt 221 can continuously come into contact with the anti-static brush 225 during operation, thereby removing the static electricity accumulated on the belt 221, thereby effectively avoiding the occurrence of the above situation.

[0051] In this embodiment, the conveyor belt 220 is a vacuum conveyor belt 220. When the conveyor belt 220 is vacuumed, negative pressure is formed on the surface of the conveyor belt 220. Under the action of the negative pressure, the film material is closely attached to the surface of the conveyor belt 220, thereby running along with the conveyor belt 220. Moreover, the film material is fixed by vacuum adsorption, and the damage caused is small. When the sheet material is discharged, the vacuum can be broken so that the sheet material can be smoothly separated from the surface of the conveyor belt 220, which is convenient for discharge.

[0052] Specifically, the conveyor belt 220 further includes a vacuum chamber 227, which is fixed to the frame 220 and disposed on one side of the belt 221. The belt 221 is provided with adsorption holes (not shown). When the vacuum chamber 227 is evacuated, negative pressure can be formed on the surface of the belt 221. In this embodiment, there are two vacuum chambers 227, which are respectively disposed below the feeding section 2212 and the discharging section 2214.

[0053] Please also read Figure 2 In this embodiment, the cutting mechanism 300 includes a bracket 310 , a cutter 320 and a driving member 330 .

[0054] The bracket 310 is generally a metal frame structure, which supports the entire cutting mechanism 300. The bracket 310 can be fixed to the frame 210 by welding, threaded fastening, etc. The cutter 320 extends in a direction perpendicular to the feeding direction of the conveyor belt 220. The cutter 320 is in a long strip shape, and its blade extends in the longitudinal direction, and the length of the blade is generally greater than the width of the strip. The driving member 330 can drive the cutter 320 to rise and fall in a direction perpendicular to the surface of the conveyor belt 220. When the cutter 320 descends to contact the strip on the surface of the conveyor belt 220, the strip can be cut. Therefore, the cutting speed of the cutting mechanism 300 is faster.

[0055] In addition, in order to improve the cutting accuracy, a position sensor can be provided at the front end of the cutter 320 to detect whether the position of the cutter 320 deviates from the predetermined cutting position. If there is a deviation, the position sensor can upload the relevant deviation data to the host computer, and the host computer can then control the corresponding servo mechanism to fine-tune the position of the cutter 320.

[0056] Furthermore, in this embodiment, the cutting mechanism 300 further includes an eccentric shaft 370 , the driving member 330 is a motor, the cutter 320 is mounted on the eccentric shaft 370 , and the eccentric shaft 370 is drivingly connected to the rotating shaft of the motor.

[0057] The rotating shaft of the motor drives the eccentric shaft 370 to rotate, and each time the eccentric shaft 370 rotates one circle, the cutter 320 connected thereto performs a lifting movement. By adjusting the initial height of the cutter 320, the cutter 320 can perform a cutting action each time it is lifted and lowered. Since the motor can rotate at a high speed, the cutting mechanism 300 can achieve high-speed cutting.

[0058] It should be noted that, in other embodiments, the cutter 320 may also be driven by a high-speed cylinder to perform high-speed cutting.

[0059] In this embodiment, the cutting mechanism 300 also includes a mounting plate 340 and a pressing plate 350. The cutter 320 is fixed to the mounting plate 340. The pressing plate 350 is distributed on both sides of the cutter 320 and is installed on the mounting plate 340 through an elastic member 351. When the elastic member 351 is in a natural state, the cutter 320 retracts into the gap formed by the pressing plates 350 on both sides.

[0060] Specifically, the mounting plate 340 is generally also in a long strip shape and is consistent with the extension direction of the cutter 320. The mounting plate 340 is generally a metal component with high strength. The pressing plate 350 extends along the cutting direction, and the elastic member 351 can be a spring, a spring sheet, etc., which can be compressed and stretched. Therefore, by applying a force to the pressing plate 350, the distance between the pressing plate 350 and the mounting plate 340 can be adjusted.

[0061] That is to say, when the driving member 330 drives the cutter 320 to press down, the pressing plates 350 on both sides will contact the film material on the conveyor belt 220 before the cutter 320. At this time, the cutter 320 has not been pressed down to the right position, and the driving member 330 will continue to drive the cutter 320 to press down. As the cutter 320 continues to press down, the elastic member 351 will be gradually compressed, so that the pressing plates 350 will gradually move closer to the mounting plate 340 until the cutter 320 is exposed.

[0062] At this time, the elastic member 351 applies elastic force to the pressing plate 350, and the pressing plate 350, under the action of the elastic force, presses the film material on both sides of the cutter 320. In this way, when the cutter 320 performs the cutting action, the film material to be cut can be kept stable, thereby preventing the edge of the cutting seam from bending, wrinkling, burrs, etc., and effectively improving the cutting effect.

[0063] Furthermore, in the present embodiment, the cutting mechanism 300 further includes a balancing cylinder 360 , two ends of which are respectively connected to the bracket 310 and the mounting plate 340 , and provide a pulling force to the mounting plate 340 .

[0064] In order to ensure a good cutting effect, the cutting mechanism 300 will be made relatively solid and heavy as a whole, so as to ensure stable knife retracting and knife out movements. However, if the mounting plate 340 and the cutter 320 are too heavy, the response speed of the cutter 320 may be slow. In view of this, a balancing cylinder 360 is provided. The balancing cylinder 360 can provide a pulling force to the mounting plate 340, thereby offsetting part of the gravity of the mounting plate 340 and the cutter 320, so as to improve the response speed of the cutter 320.

[0065] like Figure 2 As shown, in order to support balance, there are two balancing cylinders 360, which are respectively arranged at both ends of the cutter mounting plate 340.

[0066] Furthermore, in this embodiment, a plurality of guide posts 311 are provided on the bracket 310, and the extension direction of the guide posts 311 is consistent with the lifting direction of the cutter 320 in performing the cutting action. The mounting plate 340 can be sleeved on the guide posts 311 through a guide sleeve (not shown). Therefore, the guide posts 311 can play a lateral limiting role on the mounting plate 340, so that the cutter 320 can be lifted and lowered more smoothly.

[0067] In the above-mentioned film material slitting device 10, the material belt of the film material enters the feeding mechanism 200 at a constant speed and is fed in a preset direction driven by the conveyor belt 220. Then, the transfer mechanism 100 gradually accelerates, while the conveyor belt 220 decelerates synchronously until the conveyor belt 220 is stationary relative to the frame 210. At this time, the cutting mechanism 300, the conveyor belt 220 and the material belt are relatively stationary, and the cutting mechanism 300 performs a cutting action to obtain a sheet of film material. After completing one slitting, the transfer mechanism 100 drives the feeding mechanism 200 to reset, and the speed of the conveyor belt 220 is restored to the initial state, ready to perform the next slitting. In the above process, the combined speed of the moving speed of the frame 210 and the feeding speed of the conveyor belt 220 remains unchanged, so the material belt can always maintain a constant speed feeding. Moreover, since the cutting mechanism 300, the conveyor belt 220 and the material belt are relatively stationary when the cutting action is performed, the cutting position is relatively stationary with respect to the conveyor belt 220, which is conducive to improving the stability of the cutting process, thereby improving the cutting accuracy.

[0068] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A film material slitting device, characterized in that: include: Transfer mechanism; The feeding mechanism comprises a frame and a conveyor belt, wherein the frame is mounted on the transfer mechanism and is movable along a preset direction under the drive of the transfer mechanism, a cutting station is arranged on the frame, and the conveyor belt is mounted on the frame and is used to transport the film material along the preset direction; and A cutting mechanism, arranged at the cutting station, to cut the film material passing through the cutting station, and the cutting mechanism can move synchronously with the feeding mechanism along the preset direction; The working process of the film slitting device includes the following stages: Stage 1: the feeding mechanism is located at the initial position, the film material belt enters the conveyor belt from the feeding end, and the conveyor belt feeds at a constant speed; Stage 2: the transfer mechanism drives the feeding mechanism to gradually accelerate, while the conveyor belt decelerates synchronously, until the conveyor belt is stationary relative to the frame; Stage 3: The cutting mechanism performs a cutting action to obtain a sheet of film material, and the sheet is output from the discharge end; Stage 4: The transfer mechanism drives the feeding mechanism to first decelerate, then accelerate in the reverse direction, then decelerate to 0 and return to the initial position. During this process, the feeding speed of the conveyor belt is synchronously accelerated, then accelerated, then decelerated and restored to the constant speed. During the above process, the combined speed of the moving speed of the frame and the feeding speed of the conveyor belt remains unchanged, and the material belt can always maintain the constant speed feeding.

2. The film slitting device according to claim 1, characterized in that: The transfer mechanism comprises a slide rail and a linear motor. The frame is slidably mounted on the slide rail, and a driving end of the linear motor is transmission-connected to the frame.

3. The film material slitting device according to claim 1, characterized in that: The conveyor belt includes a belt and a plurality of rollers, wherein the belt is sleeved on the plurality of rollers and tensioned, and under the guidance of the plurality of rollers, the belt forms a feed section and a discharge section spaced apart from each other, and a gap between the feed section and the discharge section is opposite to the cutting station.

4. The film slitting device according to claim 3, characterized in that: The conveyor belt further comprises a destaticizing brush fixed to the frame, and the belt passes through the destaticizing brush.

5. The film slitting device according to claim 1, characterized in that: The conveyor belt is a vacuum conveyor belt.

6. The film slitting device according to claim 1, characterized in that: The cutting mechanism is fixed to the frame.

7. The film slitting device according to claim 1, characterized in that: The cutting mechanism comprises a bracket, a cutter and a driving member. The cutter extends in a direction perpendicular to the feeding direction of the conveyor belt. The driving member can drive the cutter to rise and fall in a direction perpendicular to the surface of the conveyor belt.

8. The film slitting device according to claim 7, characterized in that: The cutting mechanism also includes a mounting plate and a pressing plate, the cutter is fixed to the mounting plate, the pressing plates are distributed on both sides of the cutter and are mounted on the mounting plate through elastic members, and when the elastic members are in a natural state, the cutter retracts into a gap formed by the pressing plates on both sides.

9. The film slitting device according to claim 8, characterized in that: The cutting mechanism further comprises a balancing cylinder, two ends of which are respectively connected to the bracket and the mounting plate, and provide a pulling force to the mounting plate.

10. The film slitting device according to claim 7, characterized in that: The cutting mechanism further comprises an eccentric shaft, the driving member is a motor, the cutter is mounted on the eccentric shaft, and the eccentric shaft is drivingly connected to a rotating shaft of the motor.

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