PVC (polyvinyl chloride) film coiling machine

Abstract

The utility model discloses a PVC (polyvinyl chloride) film coiling machine and belongs to the technical field of film coiling devices. The device mainly comprises a rack, the rack is sequentially and rotationally connected with a guide roller set, a tensioning and smoothing roller set, a friction roller and an air expansion shaft from front to back, a film passing channel of the tensioning and smoothing roller set is lower than a film passing channel of the guide roller set and the upper end of the friction roller, and a cutting mechanism is arranged on the upper portion between the guide roller set and the tensioning and smoothing roller set. The tensioning and smoothing roller set comprises an upper smoothing roller and a lower smoothing roller which are arranged up and down, the two ends of the upper smoothing roller are rotationally connected with automatic tensioning mechanisms respectively, and the automatic tensioning mechanisms are fixedly connected with the rack. According to the utility model, the tensioning and smoothing roller group and the friction roller are arranged behind the cutting mechanism, so that the tensioning and smoothing roller group can smooth wrinkles generated in the conveying and cutting processes before the PVC film is wound, and the winding quality of the PVC film is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of film winding devices, and more specifically, it relates to a PVC film winding machine. Background Technology

[0002] PVC film, short for polyvinyl chloride film, has good weather resistance and chemical corrosion resistance, as well as good heat insulation. It can be used for a long time in outdoor environments without being affected, and its application is quite widespread.

[0003] Patent No. CN222118330U discloses a PVC film winding device. By adjusting the mechanism, the output end of the motor is rotated, which drives the lead screw to rotate, thereby controlling the movement of the upper pressure block. It can adjust the squeezing pressure of the two rollers in the upper and lower pressure blocks on the edge skirt of the PVC film. When the PVC film moves, it drives the two rollers to roll and squeeze the PVC film, so that the edge skirt can be straightened during the winding process, effectively preventing wrinkles from forming on the edge skirt of the PVC film during the winding process.

[0004] However, the winding device still has the following problems: 1. During the PVC film winding process, it is not enough to control the side skirt wrinkles alone. Usually, there are multiple sets of auxiliary rollers between the conveying roller and the take-up roller. Therefore, a speed difference will occur when the PVC film is conveyed, resulting in the conveying speed being sometimes fast and sometimes slow. At this time, wrinkles will occur on the PVC film on the take-up roller; 2. During the cutting process, the pulling of the cutting blade will also cause wrinkles in the PVC film; 3. After the film roll is wound up, changing the roll is time-consuming and laborious. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a PVC film winding machine, which is equipped with a tensioning and smoothing roller group and a friction roller behind the cutting mechanism. Before the PVC film is wound up, the tensioning and smoothing roller group will smooth out the wrinkles generated during the transmission and cutting process, thereby improving the winding quality of the PVC film.

[0006] The PVC film winding machine includes a frame, from which a guide roller group, a tensioning and smoothing roller group, a friction roller and an air shaft are rotatably connected in sequence from front to back. The height of the film passage of the tensioning and smoothing roller group is lower than the height of the film passage of the guide roller group and the upper end of the friction roller. A cutting mechanism is provided at the upper part between the guide roller group and the tensioning and smoothing roller group. The tensioning and smoothing roller group includes an upper smoothing roller and a lower smoothing roller arranged vertically. An automatic tensioning mechanism is rotatably connected to both ends of the upper smoothing roller. The automatic tensioning mechanism is fixedly connected to the frame.

[0007] Preferably, the upper smoothing roller and the lower smoothing roller are staggered, and soft brush rollers for contacting the PVC film are fixedly connected to the upper smoothing roller and the lower smoothing roller respectively, and the two ends of the lower smoothing roller are rotatably connected to the frame.

[0008] Preferably, the automatic tensioning mechanism includes a tensioning seat, which is fixedly connected to the frame. Guide rails are fixedly connected to both sides of the tensioning seat, and a sliding seat is slidably connected between the two guide rails. A bearing that cooperates with the upper smoothing roller is provided in the sliding seat, and a spring is provided between the upper end of the sliding seat and the tensioning seat.

[0009] Preferably, a sleeve is fixed to the upper end of the sliding seat, a limit ring is fixed to the upper end of the sleeve, a guide rod is threadedly connected to the tensioning seat, the lower end of the guide rod is an optical shaft structure, and a boss that cooperates with the limit ring is provided at the bottom of the guide rod. The guide rod is slidably connected to the sleeve, and a spring is fitted on the sleeve and the guide rod.

[0010] Preferably, the cutting mechanism includes a fixed base and a lifting cylinder. The lifting cylinder is fixedly connected to the frame, and the extended end of the lifting cylinder is connected to the fixed base. A rodless cylinder is fixedly connected inside the fixed base. A sliding block is provided on the rodless cylinder, and a T-shaped seat is fixedly connected to the sliding block. A cutting blade is fixedly connected to the T-shaped seat through a fixed plate, and the cutting blade is inclined.

[0011] Preferably, the guide roller assembly includes an upper guide roller and a lower guide roller arranged vertically. The upper guide roller and the lower guide roller are rotatably connected to both sides of the frame. One end of the upper guide roller and the lower guide roller are respectively fixedly connected to a first gear and a second gear that mesh with each other. The other end of the lower guide roller is fixedly connected to a transmission wheel. A reduction motor is fixedly connected to the frame. The output end of the reduction motor is provided with a transmission wheel that cooperates with the transmission wheel.

[0012] Preferably, a film roll removal mechanism is provided behind the friction roller. The film roll removal mechanism includes a connecting shaft, a removal cylinder, and two swing rods. The lower ends of the two swing rods are fixedly connected to the connecting shaft, and the upper ends of the swing rods are provided with U-shaped grooves that cooperate with the air expansion shaft. The extended end of the removal cylinder is rotatably connected to the middle part of the swing rod, and the other end of the removal cylinder is rotatably connected to the frame.

[0013] Preferably, the rear end of the film roll removal mechanism is provided with an auxiliary roll changing mechanism. The auxiliary roll changing mechanism includes a rotating shaft, which is rotatably connected to the frame. Two roll changing support rods corresponding to the swing rod are fixedly connected to the rotating shaft. The upper end of the roll changing support rod is provided with an arc-shaped groove that cooperates with the air expansion shaft. One end of the rotating shaft is fixedly connected to a connecting rod, and the other end of the connecting rod is rotatably connected to a roll changing cylinder, which is rotatably connected to the frame.

[0014] Preferably, the two ends of the frame are respectively provided with limiting components that cooperate with the roll changing support rod. The limiting components include swing blocks, the middle of the swing blocks is rotatably connected to the frame, the upper end of the swing blocks is opposite to the arc groove, the lower end of the swing blocks is connected to a second spring, the other end of the second spring is connected to a fixed shaft, and a limiting block is provided on the side of the lower end of the swing blocks near the roll changing support rod. The limiting block and the fixed shaft are respectively fixedly connected to the frame.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model sets up a tensioning and smoothing roller group and a friction roller behind the cutting mechanism. Before the PVC film is wound up, the tensioning and smoothing roller group will smooth out the wrinkles generated during the transmission and cutting process, which improves the winding quality of the PVC film. In addition, the tensioning and smoothing roller group works with the automatic tensioning mechanism to achieve automatic adjustment of tension while smoothing wrinkles, making the transmission of PVC film smoother and improving the smoothing effect of the tensioning and smoothing roller group.

[0017] 2. The cutting mechanism is driven by a rodless cylinder, which has high cutting accuracy and faster cutting speed. The cutting blade is fixed between the fixed plate and the T-shaped seat. The fixed plate is easy to disassemble and replace the cutting blade, making it convenient to use. The bottom of the fixed seat is equipped with anti-scratch optical shafts on both sides, which can prevent scratches on the PVC film during cutting and protect the cutting blade.

[0018] 3. The addition of a film roll removal mechanism and an auxiliary roll changing mechanism allows the roll and air shaft to be automatically removed from the frame after winding, making it easier for operators to replace the empty roll and greatly improving work efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a partial structural diagram of the present invention. Figure 1 ;

[0021] Figure 3 for Figure 2 A magnified view of part A in the middle;

[0022] Figure 4 This is a partial structural diagram of the present invention. Figure 2 ;

[0023] Figure 5 This is a partial structural diagram of the front side of this utility model;

[0024] Figure 6 This is a schematic diagram of the automatic tensioning mechanism;

[0025] Figure 7 This is a schematic diagram of the upper smoothing roller structure;

[0026] Figure 8 This is a schematic diagram of the cutting mechanism installation.

[0027] Figure 9 This is a partial structural diagram of the cutting mechanism;

[0028] Figure 10This is a diagram showing the installation of the cutting blade;

[0029] Figure 11 This is a reference diagram showing the usage state of this utility model.

[0030] In the diagram, 1. Frame; 101. Support beam; 102. Support plate; 2. Cutting mechanism; 201. Fixed seat; 202. Anti-scratch optical shaft; 203. Rodless cylinder; 204. Cutting blade; 205. T-shaped seat; 206. Fixed plate; 207. Lifting cylinder; 3. Guide roller assembly; 301. Upper guide roller; 302. Lower guide roller; 303. First gear; 304. Second gear; 305. Transmission wheel one; 306. Transmission wheel two; 307. Gear motor one; 4. Tensioning and smoothing roller assembly; 401. Upper smoothing roller; 402. Lower smoothing roller; 5. Friction roller; 501. Gear motor two; 6. 7. Air shaft; 8. Film roll removal mechanism; 9. Removal cylinder; 10. Swing rod; 11. Limit bolt; 12. Limit bolt; 13. Auxiliary roll changing mechanism; 14. Rotary shaft; 15. Roll changing support rod; 16. Arc groove; 17. Connecting rod; 18. Roll changing cylinder; 19. Swing block; 10. Limit block; 11. Spring; 12. Fixed shaft; 10. Automatic tensioning mechanism; 11. Tensioning seat; 12. Guide rail; 13. Sliding seat; 14. Spring; 15. Guide rod; 16. Adjusting nut; 17. Bearing; 18. Buffer pad. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings:

[0032] The directional terms used in the detailed description paragraphs are only for the convenience of those skilled in the art to understand the technical solutions described in this application based on the visual orientation shown in the accompanying drawings. Unless otherwise expressly specified and limited, the terms "setting," "installation," "connection," etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] like Figures 1 to 11As shown, a PVC film winding machine includes a frame 1. The frame 1 includes two upright plates, which are fixedly connected by multiple support beams 101. A guide roller group 3, a tensioning and smoothing roller group 4, a friction roller 5, and an air shaft 6 are rotatably connected sequentially from front to back between the two upright plates of the frame 1. The height of the film passage of the tensioning and smoothing roller group 4 is lower than the height of the film passage of the guide roller group 3 and the upper end of the friction roller 5. The film passage is the gap between the upper and lower roller shafts of the guide roller group 3 and the tensioning and smoothing roller group 4, which is the channel through which the PVC film passes. A cutting mechanism 2 is provided at the upper part between the guide roller group 3 and the tensioning and smoothing roller group 4. The cutting mechanism 2 is used to automatically cut the wound PVC film. The tensioning and smoothing roller group 4 includes an upper smoothing roller 401 and a lower smoothing roller 402 arranged vertically. The two ends of the lower smoothing roller 402 are rotatably connected to the frame 1 through bearing seats. Automatic tensioning mechanisms 9 are rotatably connected to both ends of the upper smoothing roller 401, and the automatic tensioning mechanisms 9 are fixedly connected to the frame 1. The tensioning and smoothing roller assembly 4, located at the front end of the PVC film winding, smooths out wrinkles generated during transmission, improving the winding quality of the PVC film. The tensioning and smoothing roller assembly 4, in conjunction with the automatic tensioning mechanisms 9, provides automatically adjusted tension while smoothing wrinkles, making the PVC film transmission smoother and improving the smoothing effect of the tensioning and smoothing roller assembly 4.

[0034] The upper smoothing roller 401 and the lower smoothing roller 402 can be vertically distributed. In this case, the upper smoothing roller 401 plays the main smoothing role, while the lower smoothing roller 402 plays an auxiliary role. Alternatively, the upper smoothing roller 401 and the lower smoothing roller 402 can be staggered. In this embodiment, it is preferable that the upper smoothing roller 401 and the lower smoothing roller 402 are staggered, so that the upper smoothing roller 401 and the lower smoothing roller 402 can play a dual smoothing role. Specifically, soft brush rollers for contacting the PVC film are fixedly connected to the upper smoothing roller 401 and the lower smoothing roller 402 respectively. Through the soft brush rollers, the upper smoothing roller 401 and the lower smoothing roller 402 contact the upper and lower end faces of the PVC film respectively. Even if wrinkles are generated after the cutting mechanism 2 cuts the PVC film, the upper smoothing roller 401 and the lower smoothing roller 402 can smooth them before winding.

[0035] like Figure 6As shown, the automatic tensioning mechanism 9 includes a rectangular tensioning seat 901, which is fixedly connected to the frame 1. Guide rails 902 are fixedly connected to both sides of the tensioning seat 901. A sliding seat 903 is slidably connected between the two guide rails 902. A bearing 907 is provided inside the sliding seat 903. The two ends of the upper smoothing roller 401 are respectively installed in the bearing 907. A spring 904 is provided between the upper end of the sliding seat 903 and the tensioning seat 901. Specifically, a sleeve is fixed to the upper end of the sliding seat 903, and a limit ring is fixed inside the upper end of the sleeve. A guide rod 905 is threadedly connected to the tensioning seat 901 through an adjusting nut 906. The adjusting nut 906 is fixed to the tensioning seat 901. The lower end of the guide rod 905 is a smooth shaft structure, and the bottom of the guide rod 905 is provided with a boss that cooperates with the limit ring. The lower end of the guide rod 905 is slidably connected to the sleeve. A spring 904 is sleeved on the sleeve and the guide rod 905. The bottom of the tensioning seat 901 is provided with a buffer pad 908 that cooperates with the bottom of the sliding seat 903 to prevent the sliding seat 903 from making hard contact with the tensioning seat 901. During use, by rotating the guide rod 905, the position of the sliding seat 903 and bearing 907 can be finely adjusted under the pulling action of the boss, thus adapting to the use of PVC films of various specifications and thicknesses. During the PVC film transmission process, the PVC film contacts the bottom of the upper smoothing roller 401. The tension of the PVC film can be automatically adjusted by the elastic force of the spring 904 to avoid the PVC film being too tight or too loose, thereby improving the stability of PVC film transmission and the smoothing effect of the upper smoothing roller 401.

[0036] like Figures 8 to 10 As shown, the cutting mechanism 2 includes a fixed base 201 and two lifting cylinders 207. The two lifting cylinders 207 are fixedly connected to the support plate 102 on the top of the frame 1. The extended ends of the lifting cylinders 207 are connected to the fixed base 201. A rodless cylinder 203 is fixedly connected inside the fixed base 201. The longitudinal section of the fixed base 201 is an inverted U-shaped structure, which can better protect the rodless cylinder 203. The rodless cylinder 203 has a built-in sliding block, which is located at the bottom of the rodless cylinder 203. A T-shaped seat 205 is fixedly connected to the sliding block. A cutting blade 204 is fixedly connected to the T-shaped seat 205 through a fixed plate 206, and the cutting blade 204 is inclined. The fixed plate 206 is threadedly connected to the side of the T-shaped seat 205. The fixed plate 206 facilitates the disassembly and replacement of the cutting blade 204, making it convenient to use. Anti-scratch optical shafts 202 are fixed on both sides of the bottom of the mounting base 201. The outer surface of the anti-scratch optical shafts 202 is smooth, which can prevent the PVC film from being scratched during cutting, and can also protect the cutting blade 204.

[0037] like Figure 5As shown, the guide roller assembly 3 includes an upper guide roller 301 and a lower guide roller 302 arranged vertically. A film passage is provided between the upper guide roller 301 and the lower guide roller 302. The upper guide roller 301 and the lower guide roller 302 are rotatably connected to both sides of the frame 1 through bearing seats. Both ends of the upper guide roller 301 and the lower guide roller 302 pass through the frame 1, and one end of the upper guide roller 301 and the lower guide roller 302 are respectively fixedly connected to a meshing first gear 303 and a second gear 304. The other end of the lower guide roller 302 is fixedly connected to a transmission wheel 305. A geared motor 307 is fixedly connected to the frame 1. The output end of the geared motor 307 is provided with a transmission wheel 306 that cooperates with the transmission wheel 305. The transmission wheel 305 and the transmission wheel 306 are preferably synchronous belt pulleys, and the transmission wheel 306 is connected to the transmission wheel 306 through a synchronous belt.

[0038] like Figure 2 As shown, a film roll removal mechanism 7 is provided behind the friction roller 5. The film roll removal mechanism 7 includes a connecting shaft, a removal cylinder 701, and two swing rods 702. Both ends of the connecting shaft are rotatably connected to the frame 1. The lower ends of the two swing rods 702 are fixedly connected to the connecting shaft, and the upper ends of the swing rods 702 are provided with U-shaped grooves that cooperate with the air shaft 6. The extended end of the removal cylinder 701 is rotatably connected to the middle of the swing rod 702, and the other end of the removal cylinder 701 is rotatably connected to the frame 1. When the removal cylinder 701 is activated, it can drive the swing rods 702 to swing around the connecting shaft, thereby removing the air shaft 6. The air shaft 6 is existing technology, and its two ends are provided with bearings that rotatably cooperate with the frame 1.

[0039] The rear end of the film roll removal mechanism 7 is equipped with an auxiliary roll changing mechanism 8. The auxiliary roll changing mechanism 8 includes a rotating shaft 801, with both ends of the rotating shaft 801 passing through the frame 1 and rotatably connected to the bottom of the frame 1 via bearings. Two roll changing support rods 802 corresponding to the swing rod 702 are fixedly connected to the rotating shaft 801. The upper end of the roll changing support rod 802 is provided with an arc-shaped groove 8021 that cooperates with the air shaft 6. One end of the rotating shaft 801 is fixedly connected to a connecting rod 803, and the other end of the connecting rod 803 is rotatably connected to a roll changing cylinder 804. The roll changing cylinder 804 is rotatably connected to the frame 1. The roll changing cylinder 804 can drive the rotating shaft 801 and the roll changing support rods 802 to rotate synchronously through the connecting rod 803.

[0040] Both ends of the frame 1 are equipped with limiting components that cooperate with the rewinding support rod 802. These limiting components are located at the front end of the auxiliary rewinding mechanism 8 to prevent the air shaft 6 from moving forward after connecting to the auxiliary rewinding mechanism 8. The limiting components include a swing block 805, the middle of which is rotatably connected to the frame 1. The upper end of the swing block 805 corresponds to the arc-shaped groove 8021. A second spring 807 is connected to the lower end of the swing block 805, and the other end of the second spring 807 is connected to a fixed shaft 808. A limiting block 806 is located on the lower end of the swing block 805 near the rewinding support rod 802. The limiting block 806 and the fixed shaft 808 are fixedly connected to the frame 1. Under the action of the limiting block 806, the swing block 805 can only rotate backward (towards the rewinding support rod 802) and cannot rotate forward, thus achieving a limiting function.

[0041] like Figure 11 As shown, in use, a roll is fitted onto the air shaft 6 and fixed after inflation. The roll abuts against the friction roller 5, and through friction, the friction roller 5 drives the roll and air shaft 6 to rotate. During winding, the PVC film passes sequentially between the upper guide roller 301 and the lower guide roller 302, the upper end of the lower smoothing roller 402, the lower end of the upper smoothing roller 401, and the upper end of the friction roller 5. The first reduction motor 307 and the second reduction motor 501 are activated. The first reduction motor 307 drives the lower guide roller 302 and the second gear 304 to rotate. The second gear 304 meshes with the first gear 303, thereby causing the upper guide roller 301 and the lower guide roller 302 to rotate relative to each other. 2 plays a guiding and driving role in the transmission of PVC film. At the same time, the geared motor 501 drives the friction roller 5 to rotate. The PVC film is finally wound on the roll. During this process, the lower smoothing roller 402 contacts the lower end of the PVC film and the upper smoothing roller 401 contacts the upper end of the PVC film. Under the action of friction, the PVC film drives the upper smoothing roller 401 and the lower smoothing roller 402 to rotate. During the rotation, the upper smoothing roller 401 and the lower smoothing roller 402 smooth the wrinkles on the outer soft PVC film.

[0042] The automatic tensioning mechanism 9, under the elastic force of spring 904, always resists the PVC film, thus automatically adjusting the tension. During the roll winding process, the telescopic rod of the removal cylinder 701 moves passively according to the thickness of the roll. When the roll reaches the required thickness, the lifting cylinder 207 in the cutting mechanism 2 is activated, driving the fixed seat 201 to descend, so that the cutting blade 204 is positioned at one end of the PVC film. Then, the rodless cylinder 203 is activated, driving the cutting blade 204 to quickly cut the PVC film. The roll continues to wind up, and the upper smoothing roller 401 and lower smoothing roller 402 can continue to smooth the cut part of the PVC film to avoid wrinkles. After winding is completed, the removal cylinder 701 is activated, driving the swing rod 702 and the air shaft 6 to rotate backward. The frame 1 is equipped with limit bolts 703 and 704 to limit the swing angle of the swing rod 702, making the swing more stable.

[0043] During this process, both ends of the air shaft 6 are always rotatably connected to the upper end of the frame 1. When the air shaft 6 moves to the swing block 805, the upper end of the swing block 805 rotates backward under the thrust of the air shaft 6, causing the air shaft 6 to pass over the swing block 805 and enter the arc groove 8021. The forward swing angle of the roll changing support rod 802 is limited by the limit bolt three. At this time, the swing block 805 rotates in the opposite direction under the reset action of the spring two 807 until the bottom abuts against the limit block 806. The upper end of the swing block 805 protrudes above the frame 1 to prevent the air shaft 6 from moving out of the arc groove 8021. Then the roll changing cylinder 804 is started, driving the roll changing support rod 802 to rotate away from the friction roller 5, causing the air shaft 6 to move out of the frame 1. At this time, the roll can be removed and a new empty roll can be installed to continue the winding operation.

[0044] Finally, although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A PVC film winding machine, comprising a frame (1), characterized in that: The frame (1) is rotatably connected from front to back to the guide roller group (3), the tensioning and smoothing roller group (4), the friction roller (5) and the air shaft (6). The height of the film passage of the tensioning and smoothing roller group (4) is lower than the height of the film passage of the guide roller group (3) and the upper end of the friction roller (5). A cutting mechanism (2) is provided on the upper part between the guide roller group (3) and the tensioning and smoothing roller group (4). The tensioning and smoothing roller group (4) includes an upper smoothing roller (401) and a lower smoothing roller (402) arranged vertically. An automatic tensioning mechanism (9) is rotatably connected to both ends of the upper smoothing roller (401). The automatic tensioning mechanism (9) is fixedly connected to the frame (1).

2. The PVC film winding machine according to claim 1, characterized in that: The upper smoothing roller (401) and the lower smoothing roller (402) are staggered. The upper smoothing roller (401) and the lower smoothing roller (402) are respectively fixedly connected with soft brush rollers for contacting the PVC film. The two ends of the lower smoothing roller (402) are rotatably connected to the frame (1).

3. A PVC film winding machine according to claim 2, characterized in that: The automatic tensioning mechanism (9) includes a tensioning seat (901), which is fixedly connected to the frame (1). Guide rails (902) are fixedly connected to both sides of the tensioning seat (901). A sliding seat (903) is slidably connected between the two guide rails (902). A bearing (907) that cooperates with the upper smoothing roller (401) is provided in the sliding seat (903). A spring (904) is provided between the upper end of the sliding seat (903) and the tensioning seat (901).

4. A PVC film winding machine according to claim 3, characterized in that: The upper end of the sliding seat (903) is fixed with a sleeve, and the upper end of the sleeve is fixed with a limit ring. The tensioning seat (901) is threaded with a guide rod (905). The lower end of the guide rod (905) is an optical shaft structure, and the bottom of the guide rod (905) is provided with a boss that cooperates with the limit ring. The guide rod (905) is slidably connected to the sleeve, and the spring (904) is sleeved on the sleeve and the guide rod (905).

5. A PVC film winding machine according to claim 1, characterized in that: The cutting mechanism (2) includes a fixed base (201) and a lifting cylinder (207). The lifting cylinder (207) is fixedly connected to the frame (1). The extended end of the lifting cylinder (207) is connected to the fixed base (201). A rodless cylinder (203) is fixedly connected inside the fixed base (201). A sliding block is provided on the rodless cylinder (203). A T-shaped seat (205) is fixedly connected on the sliding block. A cutting blade (204) is fixedly connected to the T-shaped seat (205) through a fixed plate (206). The cutting blade (204) is inclined.

6. A PVC film winding machine according to claim 1, characterized in that: The guide roller group (3) includes an upper guide roller (301) and a lower guide roller (302) arranged vertically. The upper guide roller (301) and the lower guide roller (302) are rotatably connected to both sides of the frame (1). One end of the upper guide roller (301) and the lower guide roller (302) is fixedly connected to a meshing first gear (303) and a second gear (304). The other end of the lower guide roller (302) is fixedly connected to a transmission wheel (305). A reduction motor (307) is fixedly connected to the frame (1). The output end of the reduction motor (307) is provided with a transmission wheel (306) that cooperates with the transmission wheel (305).

7. A PVC film winding machine according to any one of claims 1 to 6, characterized in that: The friction roller (5) is provided with a film roll removal mechanism (7). The film roll removal mechanism (7) includes a connecting shaft, a removal cylinder (701) and two swing rods (702). The lower ends of the two swing rods (702) are fixedly connected to the connecting shaft. The upper end of the swing rod (702) is provided with a U-shaped groove that cooperates with the air expansion shaft (6). The extended end of the removal cylinder (701) is rotatably connected to the middle part of the swing rod (702). The other end of the removal cylinder (701) is rotatably connected to the frame (1).

8. A PVC film winding machine according to claim 7, characterized in that: The rear end of the film roll removal mechanism (7) is provided with an auxiliary roll changing mechanism (8). The auxiliary roll changing mechanism (8) includes a rotating shaft (801), which is rotatably connected to the frame (1). Two roll changing support rods (802) corresponding to the swing rod (702) are fixedly connected on the rotating shaft (801). An arc groove (8021) that cooperates with the air expansion shaft (6) is opened at the upper end of the roll changing support rod (802). A connecting rod (803) is fixedly connected to one end of the rotating shaft (801), and a roll changing cylinder (804) is rotatably connected to the other end of the connecting rod (803). The roll changing cylinder (804) is rotatably connected to the frame (1).

9. A PVC film winding machine according to claim 8, characterized in that: The frame (1) is provided with limiting components at both ends that cooperate with the roll changing support rod (802). The limiting components include a swing block (805). The middle part of the swing block (805) is rotatably connected to the frame (1). The upper end of the swing block (805) is opposite to the arc groove (8021). The lower end of the swing block (805) is connected to a second spring (807). The other end of the second spring (807) is connected to a fixed shaft (808). The lower end of the swing block (805) is provided with a limiting block (806) on the side near the roll changing support rod (802). The limiting block (806) and the fixed shaft (808) are fixedly connected to the frame (1).

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