CN114572751A

CN114572751A - Film cutting bundling device

Info

Publication number: CN114572751A
Application number: CN202210348786.0A
Authority: CN
Inventors: 李拓托
Original assignee: Anqing Kangmingna Packaging Co ltd
Current assignee: Anqing Kangmingna Packaging Co ltd
Priority date: 2022-04-01
Filing date: 2022-04-01
Publication date: 2022-06-03
Anticipated expiration: 2042-04-01
Also published as: CN114572751B

Abstract

The invention provides a film cutting and roll dividing device, which comprises: the frame, unreel subassembly, rolling subassembly, cut subassembly and tensioning assembly, the rolling subassembly includes many axles that rise, and the one end of axle that rises is provided with the drive wheel, and first motor passes through the drive belt and drives each drive wheel synchronous rotation. The driving wheel comprises an inner wheel and an outer wheel, the outer wheel and the inner wheel form a ratchet mechanism, a second motor is arranged on the rack, and a rotating shaft of the second motor is connected with the inner wheel. The tensioning assemblies are arranged on the rack, correspond to the tensioning shafts in quantity one to one, are located between the cutting assemblies and the winding assemblies and are used for tensioning the cut films respectively. According to the invention, when the tensioning assembly fails, the corresponding second motor is started to accelerate the rotation of the inner wheel and simultaneously drive the corresponding tensioning assembly to reset, and then the second motor stops running. Therefore, no matter how many turns of winding of the winding barrel are, the device can ensure the compactness of the film roll which is separated and wound, and has a wider application range.

Description

Film cutting bundling device

Technical Field

The invention relates to the technical field of film production, in particular to a film cutting and roll dividing device.

Background

When producing medical paper-plastic packaging bags, the transparent film is one of the indispensable raw materials. The width of the film as a raw material is generally large, and it is necessary to cut and roll the film so that the width thereof reaches a predetermined size.

In general, when a film is cut and wound, a film material is separated into a plurality of film rolls. In the prior art, when a film raw material is cut and split, a plurality of winding barrels are generally sleeved on a tension shaft, one end of the film raw material is split into a plurality of films through a splitting assembly, the end parts of the split films are fixed on the corresponding winding barrels, and the tension shaft sleeved with the winding barrels rotates synchronously, so that the winding barrels rotate synchronously, and the effect of synchronous winding is achieved. However, since the roll material cylinder is usually a paper cylinder, the outer circumference of the roll material cylinder is not exactly the same, and the amount of change of the outer circumference is also different under the expansion force of the expansion shaft. Therefore, the winding lengths of the film winding barrels are different in the same rotation cycle, the difference value is gradually accumulated along with the number of rotating turns, finally, the film windings which are respectively wound are different in compactness, even part of the film windings are loosened and collapsed and cannot be used, and the film windings can only be used through independent secondary winding.

In the prior art, although a film cutting and winding device with a tensioning function appears, because the difference value of the winding length is gradually accumulated along with the number of turns of rotation, the device is only suitable for the condition that the number of the winding turns of the winding barrel is small, and the application range is limited.

Disclosure of Invention

The invention mainly aims to provide a film cutting and winding device which can ensure the compactness of a film roll which is wound and has a wide application range.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a film cutting and roll dividing apparatus comprising:

a frame;

the unwinding assembly is arranged at one end of the rack and used for discharging the film raw material;

the winding assembly is arranged at the other end of the rack and comprises a plurality of expanding shafts, one ends of the expanding shafts are respectively provided with a driving wheel, a first motor is arranged on the rack and drives the driving wheels to synchronously rotate through a driving belt;

the driving wheels comprise an inner wheel and an outer wheel, the outer wheel and the inner wheel form a ratchet mechanism, a second motor is arranged at the position of the rack corresponding to each driving wheel, and a rotating shaft of the second motor is connected with the inner wheel and used for accelerating the rotation of the inner wheel;

the cutting assembly is arranged on the rack, is positioned between the unwinding assembly and the winding assembly and is used for cutting the film raw material;

the tensioning assemblies are arranged on the rack, correspond to the tensioning shafts in quantity one to one, are located between the cutting assemblies and the winding assemblies and are used for tensioning the cut films respectively.

Furthermore, the outer wheel comprises at least one pawl arranged in the outer wheel, the inner wheel is provided with at least one ratchet groove matched with the pawl, and the inner wheel can accelerate to rotate along the rotation direction of the outer wheel under the driving of external force.

Furthermore, the tensioning assembly comprises a rotating rod, a connecting rod and a tensioning roller, two ends of the rotating rod are rotatably connected with the rack, and two ends of the tensioning roller are connected with the rotating rod through the connecting rod;

the top that is located the dwang of frame rotates and installs two and changes the roller, and the bottom that the tensioning roller was passed respectively from the top of one of them commentaries on classics roller to the film of cutting, then wears out to reach on the corresponding roll up feed cylinder from the top of another commentaries on classics roller.

Further, one end of the rotating rod is provided with a protruding block, two proximity sensors are arranged at the positions of the corresponding rotating rods of the rack, a controller is further arranged on the rack and connected with the two proximity sensors, and the controller is used for controlling the start and stop of each second motor.

Furthermore, a clamping plate and a pushing part are arranged on the rack corresponding to one end, away from the driving wheel, of the expansion shaft, the clamping plate is arranged on the rack in a sliding mode, a clamping groove is formed in the position, corresponding to the end portion of the expansion shaft, of the clamping plate, and the pushing part pushes the clamping plate to move towards and away from the direction of the expansion shaft, so that the end portion of the expansion shaft enters and exits in the clamping groove.

Further, unreel the subassembly and include unreeling roller and be located the lift layer board of unreeling roller below.

Furthermore, the unwinding assembly also comprises a position monitoring device for monitoring whether the position of the discharged film raw material relative to the frame deviates or not;

the unwinding roller comprises a first roller body and a second roller body, the second roller body and the first roller body are coaxial and are sleeved outside the first roller body, and the second roller body can only rotate relative to the first roller body;

a screw rod penetrates through the first roller body in a spiral mode, two ends of the screw rod penetrate through the first roller body respectively, a driving assembly is arranged on one side of the rack and connected with one end of the screw rod for driving the screw rod to rotate;

the first roller body is also provided with a braking component for preventing the first roller body from rotating relative to the frame;

the position monitoring device is connected with a controller, and the controller can control the driving assembly to drive the screw rod to rotate forwards and reversely.

Furthermore, two ends of the screw rod are respectively and rotatably provided with a fixture block, the fixture blocks are clamped on the rack, and one end of the screw rod penetrates through the fixture blocks to be detachably connected with the driving assembly;

the brake component is a polished rod which is arranged on the first roller body in a sliding penetrating mode, and two ends of the polished rod are respectively fixed on clamping blocks at two ends of the screw rod.

Further, the driving assembly comprises a first gear, a second gear meshed with the first gear and a third motor for driving the second gear to rotate;

the first gear is detachably connected with one end of the screw rod and drives the screw rod to rotate, the third motor is fixed on the rack, and the second gear is installed on an output shaft of the third motor.

The invention has the beneficial effects that:

according to the invention, when the difference value between the winding lengths of the film of each winding barrel is larger, so that the corresponding tensioning component fails, the corresponding second motor is started to accelerate the rotation of the inner wheel, so that the winding speed of the corresponding winding barrel is accelerated, meanwhile, the corresponding tensioning component is driven to reset, then the second motor stops running, and the inner wheel continues to rotate along with the outer wheel until the tensioning component fails again. Therefore, no matter how many turns of winding of the winding barrel are wound, the device can ensure the compactness of the film roll which is separated and wound, and has a wider application range.

Drawings

In the drawings:

FIG. 1 is a view of the overall structure of a film cutting and roll separating device according to the present invention;

FIG. 2 is a schematic view of another perspective of the film cutting and roll separating device according to the present invention;

FIG. 3 is a left side view of the film cutting and roll separating device according to the present invention;

FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;

FIG. 5 is a half sectional view of the film cutting and roll separating device according to the present invention;

fig. 6 is a structural view of the driving wheel according to the present invention.

Description of reference numerals:

1-frame, 11-catch plate, 111-catch groove, 12-pushing part, 2-unwinding assembly, 21-unwinding roller, 211-first roller, 212-second roller, 213-screw, 214-braking part, 215-catch block, 22-lifting pallet, 23-position monitoring device, 3-rising shaft, 31-driving wheel, 311-inner wheel, 312-outer wheel, 313-pawl, 314-ratchet groove, 32-winding barrel, 4-first motor, 41-driving belt, 5-second motor, 6-slitting assembly, 7-tensioning assembly, 71-rotating rod, 711-lug, 72-connecting rod, 73-tensioning roller, 74-rotating roller, 75-proximity sensor, 8-driving assembly, 81-first gear, 82-second gear, 83-third motor.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, and it should be understood that the described examples are only a part of the examples of the invention, and not all of the examples. The embodiments and features of the embodiments in the present application may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, "a plurality" means two or more. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the invention.

See fig. 1-6.

A film cutting and roll separating device, comprising:

a frame 1;

the unwinding assembly 2 is arranged at one end of the rack 1 and used for discharging the reel-shaped film raw material;

the winding assembly is arranged at the other end of the rack 1 and comprises a plurality of expanding shafts 3, one ends of the expanding shafts 3 are respectively provided with a driving wheel 31, each driving wheel 31 is connected with a first motor 4 through a driving belt 41, and the first motor 4 drives each driving wheel 31 to synchronously rotate through the driving belt 41. The driving wheel 31 comprises an inner wheel 311 and an outer wheel 312, the outer wheel 312 and the inner wheel 311 form a ratchet mechanism, the outer wheel 312 drives the inner wheel 311 to rotate, and the inner wheel 311 drives the expanding shaft 3 to rotate. A second motor 5 is arranged at the position of each driving wheel 31 of the frame 1, and the rotating shaft of the second motor 5 is connected with the inner wheel 311 and is used for accelerating the rotation of the inner wheel 311;

the cutting assembly 6 is arranged on the rack 1, is positioned between the unreeling assembly 2 and the reeling assembly and is used for cutting the film raw materials;

and the tensioning assemblies 7 are arranged on the rack 1, correspond to the tensioning shafts 3 in quantity one to one, are positioned between the slitting assemblies 6 and the winding assemblies and are used for tensioning the slit films respectively.

In a specific implementation, the first motor 4 drives each driving wheel 31 to rotate synchronously through the driving belt 41, each driving wheel 31 drives the corresponding expanding shaft 3 to rotate, the material winding barrels 32 are respectively sleeved on the corresponding positions of each expanding shaft 3, one end of each cut film is fixed on the corresponding material winding barrel 32, and the material winding barrels 32 rotate along with the expanding shafts 3 and respectively wind each cut film. When the winding lengths of the film of the winding barrels 32 are different, the tensioning degree of the corresponding film is ensured through the tensioning assembly 7, and the compactness of the winding barrels 32 is ensured. When the difference value of the winding lengths is large, the tensioning assembly 7 is close to failure, the corresponding second motor 5 is started at the moment, the rotation of the inner wheel 311 is accelerated, the corresponding expanding shaft 3 is driven to rotate accelerated, the winding speed of the corresponding material winding barrel 32 is accelerated, the corresponding tensioning assembly 7 is driven to reset, then the second motor 5 stops running, and the inner wheel 311 continues to rotate along with the outer wheel 312 until the tensioning assembly 7 fails again. Therefore, no matter how many turns of the winding barrel 32 are wound, the device can ensure the compactness of the film roll which is separated and wound, and has a wide application range. The tensioning assembly 7 and the slitting assembly 6 can adopt tensioning components and slitting components commonly used in the prior art, and therefore, the details are not described herein.

In one embodiment, the outer wheel 312 includes at least one pawl 313 disposed within the outer wheel 312, and the inner wheel 311 is provided with at least one ratchet groove 314 that engages the pawl 313. The outer wheel 312 drives the inner wheel 311 to rotate through the matching of the pawl 313 and the ratchet groove 314, and meanwhile, the inner wheel 311 can accelerate to rotate along the rotation direction of the outer wheel 312 under the driving of external force. Design like this, rational in infrastructure satisfies the functional requirement to the driving wheel.

In an embodiment, each tensioning assembly 7 comprises a rotating rod 71, a connecting rod 72 and a tensioning roller 73. The both ends of dwang 71 are rotated with frame 1 and are connected, and the both ends of tensioning roller 73 pass through connecting rod 72 and dwang 71 fixed connection, and frame 1's the top that is located dwang 71 is rotated and is installed two and change roller 74, and two change roller 74 are in same height and degree parallel to each other, and the bottom that tensioning roller 73 was passed from the top of one of them commentaries on classics roller 74 respectively to the film of cutting, then wear out to reach on the corresponding coil stock section of thick bamboo 32 from the top of another commentaries on classics roller 74. The tension roller 73 is rotated downward around the rotating rod 71 by gravity, and pulls the film passing through the portion downward.

In specific implementation, under normal conditions, the tension generated when the film is wound by the winding barrel 32 is balanced with the downward rotation force of the corresponding tension roller 73, and the tension roller 73 is kept in a fixed position. When the winding lengths of the films among the material winding barrels 32 are different, the material discharging lengths of the film raw materials are equal, so that the tension force of the material winding barrel 32 which winds the films slowly is reduced, and at the moment, the tension roller 73 on the tension assembly 7 corresponding to the material winding barrel 32 rotates downwards by taking the rotating rod 71 as a center to drive the films passing through the part to be stretched downwards, so that the tension force of the material winding barrel 32 is maintained. Because the winding length difference of the film is gradually accumulated along with the number of rotation turns, the tensioning roller 73 corresponding to the winding barrel 32 continuously rotates downwards by taking the rotating rod 71 as a center.

When the tensioning roller 73 is about to rotate to the rotating rod 71, the second motor 5 corresponding to the material winding barrel 32 is started at the moment, the corresponding expanding shaft 3 is driven to rotate at an increased speed, the material winding barrel 32 is accelerated to wind the film, and the force generated by the film below the tensioning roller 73 can lift the tensioning roller 73 to rotate upwards by taking the rotating rod 71 as the circle center due to the fact that the winding speed of the film is accelerated. When the tension roller 73 is reset, the second motor 5 stops rotating, and the rotating speed of the expanding shaft 3 returns to normal.

In an embodiment, a protrusion 711 is disposed at one end of the rotating rod 71, the protrusion 711 rotates with the rotating rod 71, two proximity sensors 75 are disposed at positions of the corresponding rotating rod 71 of the rack 1, and a controller (not shown in the figure) is further disposed on the rack 1, and the two proximity sensors 75 are connected to the controller, and the controller is configured to control start and stop of each second motor 5.

In a specific implementation, when the tension roller 73 is about to rotate to a position right below the rotating rod 71, at this time, the protrusion 711 rotates to a position close to one of the proximity sensors 75 along with the rotating rod 71, the proximity sensor 75 transmits a signal to the controller, and the controller controls the corresponding second motor 5 to start. When the tension roller 73 is reset, the bump 711 is rotated with the rotating rod 71 to a position close to the other proximity sensor 75, the proximity sensor 75 transmits a signal to the controller, and the controller controls the corresponding second motor 5 to be turned off.

In an embodiment, a clamping plate 11 and a pushing component 12 are arranged on the rack 1 corresponding to one end of the expanding shaft 3 far from the driving wheel 31, the clamping plate 11 is slidably arranged on the rack 1, the pushing component 12 can push the clamping plate 11 to move towards and away from the expanding shaft 3, a clamping groove 111 is formed in the position of the end portion of the corresponding expanding shaft 3 of the clamping plate 11, and after the pushing component 12 pushes the clamping plate 11 to move in place towards the expanding shaft 3, the end portion of the expanding shaft 3 is clamped by the clamping groove 111. When the pushing component 12 drives the clamping plate 11 to move to a position far away from the expanding shaft 3, the end part of the expanding shaft 3 is moved out of the clamping groove 111. The design is convenient for establish the coil stock section of thick bamboo cover on the axle that rises that corresponds, is convenient for take off the film book that the bundling is good from rising the axle simultaneously.

Preferably, a pneumatic clamping claw is further arranged in the clamping groove 111, the position of the end part of the expansion shaft relative to the clamping groove can be fixed, and the end part of the expansion shaft is prevented from displacing in the rotating process.

Preferably, the pushing member 12 may be a pneumatic or hydraulic telescopic member as in the prior art.

In one embodiment, the unwinding assembly 2 includes an unwinding roller 21 and a lifting blade 22 located below the unwinding roller 21.

In the concrete implementation, not only be convenient for go up the unloading to the film raw materials through setting up lifting support plate 22, moreover under initial condition, tensioning roller 73 is located dwang 71 under, through making lifting support plate 22 rebound, support the film raw materials, make it unable rotation blowing, be convenient for under initial debugging condition, reset each tensioning roller 73, treat the tensioning roller 73 back that resets, lifting support plate 22 downstream removes, removes the restraint to the film raw materials, make the film raw materials can carry out the blowing.

Preferably, the lifting pallet 22 includes a lifting member and a pallet on top of the lifting member, and the lifting member drives the pallet to move up and down. Wherein the lifting component can be a pneumatic telescopic component or a hydraulic telescopic component or an electric telescopic component in the prior art.

In one embodiment, the unwinding assembly 2 further comprises a position monitoring device 23 for monitoring whether the position of the discharged film material with respect to the frame 1 is deviated. The unreeling roller 21 comprises a first roller body 211 and a second roller body 212, the second roller body 212 is coaxial with the first roller body 211 and is sleeved outside the first roller body 211, and the second roller body 212 can only rotate relative to the first roller body 211. The screw rod 213 is spirally arranged in the first roller body 211 in a penetrating manner, two ends of the screw rod 213 respectively penetrate through the first roller body 211 to be rotatably connected with the frame 1, the driving component 8 is arranged on one side of the frame 1, and the driving component 8 is connected with one end of the screw rod 213 and used for driving the screw rod 213 to rotate. The first roller body 211 is further provided with a brake member 214 for preventing the first roller body 211 from rotating relative to the frame 1. The position monitoring device 23 is connected to a controller (not shown in the figure), and the controller can control the driving assembly 8 to drive the screw 213 to rotate forward and backward.

In the concrete implementation, the reel form film raw materials cover is established outside second roll body 212, the film raw materials receive to pull and drive the rotation of second roll body 212 first roll body 211 relatively and carry out the blowing, when monitoring the material that emits and take place the skew to one side, controller control drive assembly 8 drives screw rod 213 corotation, because of under the effect of brake part 214, first roll body 211 can't rotate, so screw rod 213 when rotating, can make first roll body 211 remove to one side of axis direction, the removal of first roll body 211 can drive second roll body 212 and together remove, and then rectify. When detecting that the discharged material is shifted to the other side, the controller controls the driving component 8 to drive the screw rod 213 to rotate reversely, and the first roller body 211 drives the second roller body 212 to move to the other side of the axis direction for deviation correction. In this way, the trajectory of the film raw material is consistent, and no deviation occurs, so that the winding barrel 32 sleeved on each expansion shaft 3 winds the film regularly.

The position monitoring device 23 is a conventional device, and for example, a photoelectric sensor in the conventional device can be used to perform position monitoring.

In an embodiment, two ends of the screw rod 213 are respectively rotatably provided with a fixture block 215, the fixture block 215 is clamped on the frame 1, and one end of the screw rod 213 passes through the fixture block 215 to be detachably connected with the driving assembly 8. The braking member 214 is a polish rod slidably disposed on the first roller 211, and two ends of the polish rod are respectively fixed to the locking blocks 215 at two ends of the screw 213. Design like this, wear to establish screw rod and polished rod simultaneously on the first roll body, and screw rod and polished rod disalignment, so first roll body can't rotate. Wear to establish on first roll body through making the polished rod slide, the polished rod can not influence first roll body like this and remove along the direction of its axis, and the polished rod can also play the effect of supporting first roll body simultaneously, and the power on the screw rod is applyed to first roll body of sharing. Through making the screw rod be connected with the driving component in a separable way, the film raw material is convenient to replace and is more reasonably designed

In one embodiment, the driving assembly 8 includes a first gear 81, a second gear 82 engaged with the first gear 81, and a third motor 83 for rotating the second gear 82. The first gear 81 is detachably connected to one end of the screw 213 and drives the screw 213 to rotate. The third motor 83 is fixed to the frame 1, and the second gear 82 is mounted on an output shaft of the third motor 83. By the design, the controller drives the second gear and the first gear to rotate by controlling the third motor, so that the screw rod rotates, and the first roller body drives the second roller body to move in the axis direction.

Preferably, the end of the screw rod 213 is provided with a plug, and one surface of the first gear 81 corresponding to the screw rod 213 is provided with a jack which is in plug-in fit with the plug, so that when the plug is inserted into the jack, the first gear 81 can drive the screw rod 213 to rotate. With such a design, the first gear 81 can be connected to and separated from the screw 213 only by moving the first gear 81 in the axial direction of the first gear 81, and the operation is simple and practical.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A film cutting and roll separating device, comprising:

a frame (1);

the unwinding assembly (2) is arranged at one end of the rack (1) and is used for discharging the film raw material;

the winding assembly is arranged at the other end of the rack (1) and comprises a plurality of expansion shafts (3), one ends of the expansion shafts (3) are respectively provided with a driving wheel (31), the rack (1) is provided with a first motor (4), and the first motor (4) drives each driving wheel (31) to synchronously rotate through a driving belt (41);

the driving wheels (31) comprise an inner wheel (311) and an outer wheel (312), the outer wheel (312) and the inner wheel (311) form a ratchet mechanism, a second motor (5) is arranged at the position of the rack (1) corresponding to each driving wheel (31), and a rotating shaft of the second motor (5) is connected with the inner wheel (311) and used for accelerating the rotation of the inner wheel (311);

the cutting assembly (6) is arranged on the rack (1), is positioned between the unreeling assembly (2) and the reeling assembly and is used for cutting the film raw materials;

tensioning assembly (7), set up in frame (1), quantity and the quantity one-to-one of axle (3) that rises, and be located between subassembly (6) and the rolling subassembly of cutting for carry out the tensioning respectively to each good film of cutting.

2. The film cutting and winding device according to claim 1, wherein the outer wheel (312) comprises at least one pawl (313) arranged in the outer wheel (312), the inner wheel (311) is provided with at least one ratchet groove (314) matched with the pawl (313), and the inner wheel (311) can be accelerated to rotate along the rotating direction of the outer wheel (312) under the driving of an external force.

3. The film cutting and roll dividing device according to claim 1 or 2, wherein the tensioning assembly (7) comprises a rotating rod (71), a connecting rod (72) and a tensioning roller (73), two ends of the rotating rod (71) are rotatably connected with the frame (1), and two ends of the tensioning roller (73) are connected with the rotating rod (71) through the connecting rod (72);

two rotating rollers (74) are rotatably mounted above the rotating rod (71) of the rack (1), the cut film respectively penetrates through the bottom of the tensioning roller (73) from the upper part of one of the rotating rollers (74), and then penetrates out from the upper part of the other rotating roller (74) to reach the corresponding winding barrel (32).

4. The film cutting and separating device according to claim 3, wherein a protrusion (711) is arranged at one end of the rotating rod (71), two proximity sensors (75) are arranged at the positions of the corresponding rotating rods (71) of the rack (1), a controller is further arranged on the rack (1), and the two proximity sensors (75) are connected with the controller, and the controller is used for controlling the start and stop of each second motor (5).

5. The film cutting and roll dividing device according to claim 1 or 2, wherein a clamping plate (11) and a pushing component (12) are arranged on the rack (1) corresponding to one end of the expansion shaft (3) far away from the driving wheel (31), the clamping plate (11) is slidably arranged on the rack (1), a clamping groove (111) is formed in the position of the end of the corresponding expansion shaft (3) of the clamping plate (11), and the pushing component (12) pushes the clamping plate (11) to move towards the direction close to and far away from the expansion shaft (3) so that the end of the expansion shaft (3) can come in and go out in the clamping groove (111).

6. The film cutting and separating device according to claim 1 or 2, wherein the unwinding assembly (2) comprises an unwinding roller (21) and a lifting pallet (22) positioned below the unwinding roller (21).

7. The film cutting and unwinding device according to claim 6, wherein said unwinding assembly (2) further comprises position monitoring means (23) for monitoring whether the position of the unwound film stock with respect to the frame (1) is deviated;

the unwinding roller (21) comprises a first roller body (211) and a second roller body (212), the second roller body (212) and the first roller body (211) are coaxial and are sleeved outside the first roller body (211), and the second roller body (212) can only rotate relative to the first roller body (211);

a screw rod (213) penetrates through the first roller body (211) in a spiral mode, two ends of the screw rod (213) penetrate through the first roller body (211) respectively, a driving assembly (8) is arranged on one side of the rack (1), and the driving assembly (8) is connected with one end of the screw rod (213) and used for driving the screw rod (213) to rotate;

the first roller body (211) is also provided with a braking component (214) for preventing the first roller body (211) from rotating relative to the frame (1);

the position monitoring device (23) is connected with a controller, and the controller can control the driving component (8) to drive the screw rod (213) to rotate positively and negatively.

8. The film cutting and separating device according to claim 7, wherein two ends of the screw rod (213) are respectively provided with a fixture block (215) in a rotating manner, the fixture blocks (215) are clamped on the frame (1), and one end of the screw rod (213) passes through the fixture blocks (215) and is detachably connected with the driving assembly (8);

the braking component (214) is a polish rod which is arranged on the first roller body (211) in a sliding mode, and two ends of the polish rod are respectively fixed on clamping blocks (215) at two ends of the screw rod (213).

9. The film cutting and roll-dividing device according to claim 7, characterized in that the driving assembly (8) comprises a first gear (81), a second gear (82) engaged with the first gear (81), and a third motor (83) for driving the second gear (82) to rotate;

the first gear (81) is detachably connected with one end of the screw rod (213) and drives the screw rod (213) to rotate, the third motor (83) is fixed on the frame (1), and the second gear (82) is installed on an output shaft of the third motor (83).