Film slitting device

Abstract

The utility model relates to a film slitting device which comprises a rack and a slitting mechanism, one end of the rack is a feeding end, the other end of the rack is a discharging end, the feeding end of the rack is connected to an unwinding device, the slitting mechanism is erected between the feeding end and the discharging end of the rack, and the slitting mechanism is used for slitting a film unwound by the unwinding device. The slitting mechanism comprises a cut-off assembly, the cut-off assembly comprises a plurality of slitting knives, the slitting knives are arranged on the rack in the width direction of the rack in a sliding mode, and the distance between any slitting knife and the adjacent slitting knife is adjustable. And the multiple slitting knives are used for slitting the thin film roll into multiple sets of thin film rolls of different sizes at the same time. The thin film slitting device has the effect of improving the thin film slitting convenience.

Description

Technical Field

[0001] The present application relates to the field of adhesive tape production, and in particular to a film slitting device. Background Art

[0002] Plastic film has the advantages of being light, flexible, corrosion-resistant and highly plastic. It is widely used in food packaging, agricultural covering, medical use, building insulation, electronic product protection, industrial production and other fields, providing effective protection, packaging and isolation functions.

[0003] During the film production process, the film size that can be produced by the extruder is fixed. However, in the actual production process, according to the design requirements, the final film size values ​​are diverse, so the film roll produced by the extruder has to be slit, that is, the film roll produced by the extruder is placed in a slitting machine, the film roll is unrolled through the unwinding device, and the film roll is cut by the slitting machine's knife head controlled by the slitting machine controller, thereby forming several film rolls of different sizes.

[0004] However, in the existing production line, the film roll can only be cut into two groups at a time, and then the already cut film roll is cut again until the size meets the design requirements. The operation is complicated and there is room for improvement. Utility Model Content

[0005] In order to improve the convenience of film slitting, the present application provides a film slitting device.

[0006] The film slitting device provided in this application adopts the following technical solution:

[0007] A film slitting device comprises a frame and a slitting mechanism, wherein one end of the frame is a loading end and the other end is a discharging end, the loading end of the frame is connected to a reeling device, the slitting mechanism is arranged between the loading end and the discharging end of the frame, the slitting mechanism is used to slitting the film unrolled by the reeling device, the slitting mechanism comprises a cutting assembly, the cutting assembly comprises a plurality of slitting knives, the plurality of slitting knives are slidably arranged on the frame along the width direction of the frame, and the distance between any slitting knife and the adjacent slitting knife is adjustable, and the plurality of slitting knives are used to simultaneously slit a film roll into a plurality of groups of film rolls of different sizes.

[0008] By adopting the above technical scheme, the operator adjusts the spacing between several slitting knives, and can slit the film roll into different widths by adjusting the spacing between several slitting knives, and unwinds the film roll to be cut through the unwinding device. When the film roll to be cut reaches the slitting mechanism, films of different sizes are simultaneously slit by several component slitting knives. Compared with the method of slitting the film roll into two groups at a time, the present application has a higher efficiency in slitting the film roll, and can produce several groups or film rolls of different sizes at the same time, which plays a positive guiding role in improving the convenience of film slitting.

[0009] Preferably, the slitting mechanism also includes an adjusting component, which includes a slide rail and a plurality of locking sliders, the slide rail is arranged on the frame along the width direction of the frame, a plurality of locking sliders are slidably arranged on the slide rail, and the number of the plurality of locking sliders is the same as the number of the plurality of slitting knives, the slitting knife is detachably arranged on the locking slider, and the blade head of the slitting knife is arranged downward in the vertical direction.

[0010] By adopting the above technical scheme, several locking blocks can move smoothly along the slide rail through the slide rail. At the same time, because the locking slider itself has a locking function, when the spacing between several groups of locking sliders is adjusted, the locking slider is locked on the slide rail at the current position, thereby reducing the swing of the slitting knife carried by the locking slider during operation, which plays a positive guiding role in improving the cutting accuracy, and the slitting knife is detachably arranged on the locking slider to facilitate the replacement or maintenance of the slitting knife.

[0011] Preferably, distance detection sensors are respectively provided on several locking sliders, the detection ends of the distance detection sensors are arranged in the same direction, and any one of the distance detection sensors is oriented toward the locking slider adjacent to it, and any one of the distance detection sensors is electrically connected to the controller.

[0012] By adopting the above technical solution, the distance between the two groups of locking slides is detected by a distance detection sensor, and the detection signal is sent to the controller. The controller processes the detection signal, thereby indirectly measuring the distance between two adjacent slitting knives, so that the operator can adjust the distance between the two slitting knives relatively accurately and reduce the dimensional error during cutting.

[0013] Preferably, a supporting assembly is provided on the frame, and the supporting assembly includes a supporting roller and two groups of return springs. The supporting roller is slidably arranged on the frame between the adjusting assembly and the unwinding device along the vertical direction, and the supporting roller is used to press the film tightly. The two groups of return springs are arranged at both ends of the frame along the width direction of the frame, and the free ends of the two groups of return springs are in contact with the roller axes of the supporting rollers. The return springs are used to provide an upward elastic force to the supporting roller along the vertical direction.

[0014] By adopting the above technical scheme, after the film roll is unwound by the unwinding device, the supporting effect of the supporting roller can make the film in a straight state when the film is unwound, thereby reducing the probability of uneven cutting surface caused by the unevenness of the film when the unwound film reaches several cutting knives; at the same time, through the elastic force provided by the reset spring, when the tension on the film is too large, the supporting roller is subjected to downward pressure in the vertical direction, so that the reset spring is compressed. Through the above process, the probability of deformation or tearing of the film due to excessive tension during the cutting process is reduced.

[0015] Preferably, sliding grooves are provided at both ends of the frame along the width direction, the sliding grooves are arranged along the vertical direction, the supporting rollers slide in cooperation with the sliding grooves, the fixed ends of the two groups of the return springs are arranged at the bottom ends of the sliding grooves, and the contour of the sliding grooves is the same as the external contour of the return springs.

[0016] By adopting the above technical solution, the movement path of the supporting roller is limited by the sliding groove, thereby reducing the swing of the supporting roller when moving in the vertical direction, which plays a positive guiding role in improving the overall stability. At the same time, the bending degree of the return spring when the return spring is subjected to pressure is limited by the sliding groove, thereby reducing the probability of the return spring popping out due to the excessive bending angle of the return spring.

[0017] Preferably, it also includes a winding mechanism, which includes an air-expanding shaft, a positioning assembly and a driving assembly. The air-expanding shaft is detachable and rotatably supported on the discharge end of the frame. The driving assembly is arranged on the frame on one side of the air-expanding shaft. The air-expanding shaft is used to sleeve the reel. The positioning assembly is used to realize the installation and positioning of the air-expanding shaft. The driving assembly is used to drive the air-expanding shaft to rotate along the frame.

[0018] By adopting the above technical solution, the operator sets the reel for winding on the air expansion shaft. When the air expansion shaft is in working state, the reel is stably fixed on the air expansion shaft, and the swing of the reel on the air expansion shaft when the driving component drives the air expansion shaft to rotate is reduced, so that the film after cutting can be wound in an orderly manner, and the air expansion shaft is installed and positioned by the positioning component, so that the air expansion shaft can be disassembled or installed along the frame.

[0019] Preferably, the positioning assembly comprises a positioning pulley, the air expansion shaft is rotatably carried inside the positioning pulley, and the positioning slide is clamped on the frame along the width direction of the frame.

[0020] By adopting the above technical solution, the gas expansion shaft is rotatably carried in the positioning pulley, and the gas expansion shaft can be taken out along the frame by disassembling the positioning pulley, thereby simplifying the mechanical structure and facilitating operators to replace or maintain the gas expansion shaft.

[0021] Preferably, the driving assembly includes a driving motor and a power transmission component, the driving motor is arranged on the frame on one side of the pneumatic shaft, the transmission component includes a driving wheel and a driven wheel, the driven wheel is coaxially fixed with the pneumatic shaft, the driven wheel is coaxially fixed with the output shaft of the driving motor, and the driving wheel is meshed with the driven wheel.

[0022] By adopting the above technical solution, the driving motor drives the active gear to rotate, thereby causing the driven gear meshing with the active gear to rotate, and then driving the air shaft to rotate. The power of the driving motor can be efficiently transmitted to the air shaft, which simplifies the mechanical structure and improves the transmission efficiency of the driving motor to a certain extent, reducing energy loss.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. Compared with the method of only slitting the film roll into two groups at a time, the present application has a higher efficiency in slitting the film roll, and can produce several groups or film rolls of different sizes at the same time, which plays a positive guiding role in improving the convenience of film slitting;

[0025] 2. Through the detection function of the distance detection sensor, it is convenient for the operator to adjust the distance between the two slitting knives relatively accurately, reducing the size error during cutting;

[0026] 3. The movement path of the support roller is limited by the sliding groove, thereby reducing the swing of the support roller when moving in the vertical direction, which plays a positive guiding role in improving the overall stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of a film slitting device in an embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the overall structure of a film slitting device after the unwinding device is hidden in an embodiment of the present application.

[0029] Figure 3 yes Figure 1 Enlarged schematic diagram of part A.

[0030] Figure 4 This is a schematic diagram of a film slitting device in an embodiment of the present application correcting a detection result through a controller.

[0031] Explanation of the accompanying drawings: 1. Frame; 2. Slitting mechanism; 21. Cutting assembly; 211. Slitting knife; 22. Adjusting assembly; 221. Slide rail; 222. Locking slider; 3. Unwinding device; 4. Distance detection sensor; 5. Supporting assembly; 51. Reset spring; 52. Supporting roller; 6. Slide groove; 7. Load-bearing plate; 8. Rewinding mechanism; 81. Air shaft; 82. Positioning assembly; 821. Positioning pulley; 822. Fixing bolt; 83. Driving assembly; 831. Driving motor; 832. Power transmission member; 8321. Driving wheel; 8322. Driven wheel; 9. U-shaped opening. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-3 This application is described in further detail.

[0033] The present application embodiment discloses a film slitting device. Figure 1 and Figure 3 A film slitting device includes a frame 1, a slitting mechanism 2 and a winding mechanism 8. One end of the frame 1 is a feeding end, and the other end is a discharging end. The feeding end of the frame 1 is connected to the unwinding device 3. The slitting mechanism 2 is arranged between the feeding end and the discharging end of the frame 1. The slitting mechanism 2 is used to slit the film of the unwinding device 3. The winding mechanism 8 is arranged at the discharging end of the frame 1. The winding mechanism 8 is used to rewind the film after slitting by the slitting mechanism 2.

[0034] Among them, the unwinding device 3 is the unwinding component of the existing slitting machine, including an unwinding roller and a driving source. The unwinding roller is rotatably carried on the unwinding device 3, and the driving source is installed on the unwinding device 3. The unwinding roller is driven to rotate by the driving source, so that the film roll placed on the unwinding roller can be unwound. It is an existing device, and its specific composition and working principle will not be repeated here.

[0035] Furthermore, the slitting mechanism 2 includes a cutting assembly 21, which includes a plurality of slitting knives 211. The plurality of slitting knives 211 are slidably arranged on the frame 1 along the width direction of the frame 1, and the distance between any slitting knife 211 and the adjacent slitting knife 211 is adjustable. The plurality of slitting knives 211 are used to slit the film roll into a plurality of groups of film rolls of different sizes.

[0036] Therefore, the implementation principle of a film slitting device in an embodiment of the present application is: an operator adjusts the spacing between a plurality of slitting knives 211, and can slit a film roll into different widths by adjusting the spacing between a plurality of slitting knives 211, and unwinds the film roll to be cut through the unwinding device 3. When the film roll to be cut reaches the slitting mechanism 2, films of different sizes are simultaneously slit through a plurality of group slitting knives 211. Compared with the method of slitting a film roll into two groups at a time, the present application has a higher efficiency in slitting a film roll, and can produce several groups or film rolls of different sizes at the same time, which plays a positive guiding role in improving the convenience of film slitting.

[0037] Reference Figure 2 and Figure 3 A supporting assembly 5 is provided on the frame 1, and the supporting assembly 5 includes a supporting roller 52 and two sets of return springs 51. The supporting roller 52 is slidably provided on the frame 1 between the adjusting assembly 22 and the unwinding device 3 along the vertical direction, and the supporting roller 52 is used to press against the film. The two sets of return springs 51 are provided at both ends of the frame 1 along the width direction of the frame 1, and the free ends of the two sets of return springs 51 are in contact with the roller shafts of the supporting roller 52. The return springs 51 are used to provide an upward elastic force to the supporting roller 52 along the vertical direction.

[0038] Its function is that after the film roll is unwound by the unwinding device 3, the supporting effect of the supporting roller 52 allows the film to be in a straight state when it is unwound, thereby reducing the probability of uneven cutting surfaces caused by the unevenness of the film when the unwound film reaches several cutting knives; at the same time, through the elastic force provided by the reset spring 51, when the tension on the film is too large, the supporting roller 52 is subjected to downward pressure in the vertical direction, so that the reset spring 51 is compressed, and the above process is completed.

[0039] Similarly, when the tension on the film is too small, it means that the film is in a relaxed state when passing along the supporting roller 52. At this time, the reset spring 51 will release the elastic potential energy, thereby pushing the supporting roller 52 to move upward along the sliding groove 6, so that the film is in a taut state, thereby reducing the probability of the film being deformed or torn due to excessive tension during the cutting process, or the probability of the film being subjected to insufficient tension, resulting in an uneven cutting surface when the slitting knife 211 slits the film.

[0040] Furthermore, sliding grooves 6 are provided at both ends of the frame 1 along the width direction, and the sliding grooves 6 are opened along the vertical direction. The supporting rollers 52 slide in cooperation with the sliding grooves 6, and the fixed ends of the two sets of return springs 51 are arranged at the bottom ends of the sliding grooves 6, and the contour of the sliding grooves 6 is the same as the external contour of the return springs 51.

[0041] Correspondingly, the free ends of the two groups of return springs 51 are respectively installed with supporting plates 7, which slide with the sliding groove 6. At the same time, bearings are respectively installed at both ends of the roller shaft of the supporting roller 52. When the supporting roller 52 is placed in the sliding groove 6, the bearings on the roller shaft at both ends of the supporting roller 52 are both located in the sliding groove 6, so that the supporting roller 52 can rotate smoothly along the frame 1 to reduce the resistance encountered when the film roll is unwound.

[0042] Therefore, the sliding groove 6 is used to limit the movement path of the supporting roller 52, thereby reducing the swing of the supporting roller 52 when moving in the vertical direction, which plays a positive guiding role in improving the overall stability. At the same time, the sliding groove 6 is used to limit the bending degree of the return spring 51 when the return spring 51 is subjected to pressure, thereby reducing the probability of the return spring 51 popping out due to the excessive bending angle of the return spring 51.

[0043] Reference Figure 2 and Figure 3 The slitting mechanism 2 also includes an adjusting component 22, which includes a slide rail 221 and a plurality of locking sliders 222. The slide rail 221 is arranged on the frame 1 along the width direction of the frame 1, and a plurality of locking sliders 222 are slidably arranged on the slide rail 221. The number of the plurality of locking sliders 222 is the same as the number of the plurality of slitting knives 211. The slitting knife 211 is detachably arranged on the locking slider 222, and the blade head of the slitting knife 211 is arranged downward in the vertical direction.

[0044] Specifically, the number of the slitting knives 211 can be set to three, four, etc., and can also be adjusted according to the actual number of slitting groups. In this embodiment, five slitting knives 211 are provided, and five corresponding locking slide blocks 222 are synchronously provided. The five slitting knives 211 and the five locking slide blocks 222 are installed on the locking slide blocks 222 in a one-to-one correspondence through bolts.

[0045] Its function is that as the slitting knife 211 is used for a longer time, the blade of the slitting knife 211 will experience irreversible mechanical wear, thereby reducing the sharpness of the blade of the slitting knife 211. Therefore, the slitting knife 211 can be disassembled along the locking slider 222 to facilitate maintenance or replacement of the cutting knife.

[0046] At the same time, the slide rail 221 is used to enable several locking blocks to move smoothly along the slide rail 221. At the same time, since the locking slider 222 itself has a locking function, when the spacing between several groups of locking sliders 222 is adjusted, the locking slider 222 is locked on the slide rail 221 at the current position, thereby reducing the swing of the slitting knife 211 carried by the locking slider 222 during operation, which plays a positive guiding role in improving the cutting accuracy, and the slitting knife 211 is detachably arranged on the locking slider 222 to facilitate the replacement or maintenance of the slitting knife 211.

[0047] It should be noted here that a locking nut is provided on the locking slider 222, and the locking nut penetrates the locking slider 222 along the thickness direction of the locking slider 222. When it is necessary to adjust the position of the locking slider 222 along the slide rail 221, the locking nut can be loosened, so that the locking slider 222 can be smoothly adjusted along the length direction of the slide rail 221. It is an existing component, and its specific composition and working principle will not be described in detail here.

[0048] Reference Figure 2 and Figure 3 A distance detection sensor 4 is respectively provided on a plurality of locking slide blocks 222 , and the distance detection sensor 4 is used to detect the distance between two locking slide blocks 222 , and the distance detection sensor 4 is electrically connected to the controller.

[0049] Specifically, in the present embodiment, five groups of distance detection sensors 4 are provided, and the five groups of distance detection sensors 4 are installed on the locking slider 222. Thus, the distance detection sensor 4 on the locking slider 222 at one end along the length direction of the slide rail 221 can be used as a zero position sensor, and the detection end of the zero position sensor is horizontally directed toward the frame 1.

[0050] Furthermore, the distance between the two groups of locking sliders 222 is detected by the distance detection sensor 4, and the detection signal is sent to the controller. The controller processes the detection signal, thereby indirectly measuring the distance between the two adjacent slitting knives 211, so that the operator can adjust the distance between the two slitting knives 211 relatively accurately and reduce the dimensional error during cutting.

[0051] It should be noted here that the controller is the controller of the slitting machine, which can be a PLC (Programmable Logic Controller) with programming capabilities and a human-computer interaction interface. The operator can observe the operating status of each component in real time through the human-computer interaction interface. It is an existing device, and the specific composition and working principle will not be repeated here.

[0052] Its working principle is that, for example, there is a roll of film with a width of 1010mm (international unit, millimeter). According to production requirements, it needs to be cut into four sizes of 500mm, 250mm, 125mm, and 125mm. The operator adjusts the distance between the locking slider 222 installed with the zero position sensor and the frame 1, and sets the zero position sensor to zero through the controller. Then, the distance between the locking sliders 222 located behind the zero position sensor is adjusted in sequence through the human-computer interaction interface of the controller, so that the distance between two adjacent locking sliders 222 is 500mm, 250mm, 125mm, and 125mm, respectively, that is, the distance between two adjacent slitting knives 211 is 500mm, 250mm, 125mm, and 125mm, respectively.

[0053] It should be noted here that, refer to Figure 4 In actual application, there is a transition distance between the slitting knife 211 on any locking slider 222 and the detection end of the distance detection sensor 4 of the current locking slider 222, so the detection result needs to be corrected by the controller.

[0054] Assume that: the thickness of the slitting knife 211 is N, the distance between the side wall of the slitting knife 211 and the distance detection sensor 4 is M, the distance between the two locking sliders 222 detected by the distance detection sensor 4 is L, the thickness of the distance detection sensor 4 is H, and the distance displayed on the human-computer interaction interface of the controller is K. When actually programming the controller, K=N+2M+L+H, and K is the actual distance between the two adjacent slitting knives 211.

[0055] Reference Figure 1-Figure 3 The winding mechanism 8 includes an air-expanding shaft 81, a positioning assembly 82 and a driving assembly 83. The air-expanding shaft 81 is detachable and rotatably carried on the discharge end of the frame 1. The driving assembly 83 is arranged on the frame 1 on one side of the air-expanding shaft 81. The air-expanding shaft 81 is used to sleeve the reel. The positioning assembly 82 is used to realize the installation and positioning of the air-expanding shaft 81. The driving assembly 83 is used to drive the air-expanding shaft 81 to rotate along the frame 1. The operator sleeves the reel for winding on the air-expanding shaft 81. When the air-expanding shaft 81 is in a working state, the reel is stably fixed on the air-expanding shaft 81, and the swing of the reel on the air-expanding shaft 81 when the driving assembly 83 drives the air-expanding shaft 81 to rotate is reduced, so that the film after cutting is orderly wound up, and the air-expanding shaft 81 is installed and positioned by the positioning assembly 82, so that the air-expanding shaft 81 can be disassembled or installed along the frame 1.

[0056] Reference Figure 2 and Figure 3The positioning assembly 82 includes a positioning pulley 821 and a fixing bolt 822 . The air shaft 81 is rotatably carried in the positioning pulley 821 . The positioning pulley 821 is clamped on the frame 1 along the width direction of the frame 1 .

[0057] Specifically, two groups of positioning pulleys 821 and fixing bolts 822 are provided, and U-shaped openings 9 are provided on both groups of positioning pulleys 821. At the same time, U-shaped openings 9 are provided at the front end of the discharging end of the frame 1, and the positioning pulleys 821 are slidably provided on the frame 1 along the U-shaped openings.

[0058] Furthermore, two sets of fixing bolts 822 are respectively threadedly inserted into the two U-shaped openings 9 along the upper ends of the two U-shaped openings 9. When the fixing bolts 822 are tightened, the tail ends of the fixing bolts 822 abut against the positioning pulley 821. Due to the friction force, the positioning pulley 821 is relatively stably parked in the U-shaped opening 9. The fixing bolts 822 are loosened, and the tail ends of the fixing bolts 822 are separated from the positioning pulley 821. The positioning pulley 821 can slide along the U-shaped opening 9, thereby achieving the purpose of disassembling or installing the air expansion shaft 81 along the frame 1.

[0059] Reference Figure 2 The driving assembly 83 includes a driving motor 831 and a power transmission member 832. The driving motor 831 is arranged on the frame 1 on one side of the gas expansion shaft 81. The transmission member includes a driving wheel 8321 and a driven wheel 8322. The driven wheel 8322 is coaxially fixed with the gas expansion shaft 81, and the driven wheel 8322 is coaxially fixed with the output shaft of the driving motor 831. The driving wheel 8321 is meshed with the driven wheel 8322. The driving motor 831 drives the driving gear to rotate, thereby rotating the driven gear meshed with the driving gear, thereby driving the gas expansion shaft 81 to rotate. The power of the driving motor 831 can be efficiently transmitted to the gas expansion shaft 81, which simplifies the mechanical structure and improves the transmission efficiency of the driving motor 831 to a certain extent, reducing energy loss.

[0060] Finally, the reel is a component used to collect the film after slitting. The interior of the reel is hollow and is used to be sleeved on the air inflation shaft 81. The size of the reel is compatible with the size of the film to be slit, which is explained here.

[0061] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A film slitting device, characterized in that: The invention comprises a frame (1) and a slitting mechanism (2), wherein one end of the frame (1) is a loading end and the other end is a discharging end, the loading end of the frame (1) is connected to a reeling device (3), the slitting mechanism (2) is arranged between the loading end and the discharging end of the frame (1), the slitting mechanism (2) is used for slitting the film unrolled by the reeling device (3), the slitting mechanism (2) comprises a cutting assembly (21), the cutting assembly (21) comprises a plurality of slitting knives (211), the plurality of slitting knives (211) are slidably arranged on the frame (1) along the width direction of the frame (1), and the distance between any slitting knife (211) and the adjacent slitting knife (211) is adjustable, and the plurality of slitting knives (211) are used for simultaneously slitting a film roll into a plurality of groups of film rolls of different sizes.

2. A film slitting device according to claim 1, characterized in that: The slitting mechanism (2) further comprises an adjusting component (22), the adjusting component (22) comprising a slide rail (221) and a plurality of locking sliders (222), the slide rail (221) being arranged on the frame (1) along the width direction of the frame (1), a plurality of locking sliders (222) being slidably arranged on the slide rail (221), and the number of the plurality of locking sliders (222) being the same as the number of the plurality of slitting knives (211), the slitting knives (211) being detachably arranged on the locking slider (222), and the blade head of the slitting knife (211) being arranged downward in the vertical direction.

3. A film slitting device according to claim 2, characterized in that: A distance detection sensor (4) is respectively arranged on a plurality of locking slide blocks (222). The distance detection sensor (4) is used to detect the distance between two locking slide blocks (222). The distance detection sensor (4) is electrically connected to the controller.

4. A film slitting device according to claim 3, characterized in that: The frame (1) is provided with a supporting assembly (5), the supporting assembly (5) comprising a supporting roller (52) and two groups of return springs (51), the supporting roller (52) being slidably arranged on the frame (1) between the adjusting assembly (22) and the unwinding device (3) along the vertical direction, the supporting roller (52) being used to press against the film, the two groups of return springs (51) being arranged at both ends of the frame (1) along the width direction of the frame (1), the free ends of the two groups of return springs (51) being in contact with the roller shafts of the supporting rollers (52), the return springs (51) being used to provide the supporting rollers (52) with an upward elastic force along the vertical direction.

5. A film slitting device according to claim 4, characterized in that: The frame (1) is provided with sliding grooves (6) at both ends along the width direction, and the sliding grooves (6) are arranged along the vertical direction. The supporting roller (52) is slidingly matched with the sliding grooves (6), and the fixed ends of the two groups of return springs (51) are arranged at the bottom ends of the sliding grooves (6). The profile of the sliding grooves (6) is the same as the external profile of the return springs (51).

6. A film slitting device according to claim 5, characterized in that: The invention also comprises a winding mechanism (8), wherein the winding mechanism (8) comprises an air-expanding shaft (81), a positioning assembly (82) and a driving assembly (83); the air-expanding shaft (81) is detachably and rotatably supported on the discharge end of the frame (1); the driving assembly (83) is arranged on the frame (1) on one side of the air-expanding shaft (81); the air-expanding shaft (81) is used for sleeve-mounting a reel; the positioning assembly (82) is used for realizing the installation and positioning of the air-expanding shaft (81); and the driving assembly (83) is used for driving the air-expanding shaft (81) to rotate along the frame (1).

7. A film slitting device according to claim 6, characterized in that: The positioning assembly (82) comprises a positioning pulley (821), the air expansion shaft (81) is rotatably carried inside the positioning pulley (821), and the positioning slide is clamped on the frame (1) along the width direction of the frame (1).

8. A film slitting device according to claim 7, characterized in that: The driving assembly (83) comprises a driving motor (831) and a power transmission member (832); the driving motor (831) is arranged on the frame (1) on one side of the air expansion shaft (81); the transmission member comprises a driving wheel (8321) and a driven wheel (8322); the driven wheel (8322) is coaxially fixed to the air expansion shaft (81); the driven wheel (8322) is coaxially fixed to the output shaft of the driving motor (831); and the driving wheel (8321) is meshed with the driven wheel (8322).

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