Constant-force automatic winding device for film roll

Abstract

The invention relates to the technical field of plastic film winding devices, and discloses a film roll constant-force automatic winding device which comprises a supporting frame base, a cross beam, a movable roller, a fixed roller and a winding roller, a supporting frame is arranged on the supporting frame base, after a blow molding machine completes film blowing, a formed plastic film is conveyed to the fixed roller through a guide roller and is wound through the winding roller, and the cross beam is arranged on the supporting frame base. The cross beam is arranged on the supporting frame and moves up and down along the supporting frame, the lower portion of the cross beam is connected with the winding strip, the winding strip can be collected into a base of the supporting frame, pulling force can be generated on the cross beam in the collecting process, the movable roller is arranged on the cross beam, the fixed roller is arranged above the supporting frame and fixed in position, and the fixed roller and the movable roller are arranged in a staggered mode. A plastic film sequentially bypasses the fixed rollers and the movable rollers, a pause assembly is arranged between the fixed rollers and the winding roller, the plastic film bypasses the last fixed roller and then penetrates through the pause assembly to be wound by the winding roller, and when the winding roller cuts off the plastic film, the pause assembly can provide pulling force for the plastic film located in the fixed rollers and the movable rollers.

Description

Technical Field

[0001] The invention relates to the technical field of plastic film winding devices, in particular to a constant-force automatic winding device for a film roll. Background Art

[0002] As a professional plastic film production equipment, the film blowing machine covers the entire process from the melting of plastic particles to the final film winding. At the beginning of production, the film blowing machine will first heat the plastic particles to a molten state through an extruder to form continuous film bubbles. This link is extremely critical to temperature control to ensure that the plastic can melt evenly without generating bubbles or impurities. Then, the film bubble gradually expands under the guidance of the film ring. At the same time, the fan fills a certain amount of gas into the film bubble to maintain the air pressure so that the film bubble can expand and avoid rupture due to excessive air pressure during the winding process. In order to ensure the quality and stability of the film, the film blowing machine is equipped with an efficient cooling system during the expansion of the film bubble. The system accurately controls the flow and temperature of the cooling air to quickly cool and solidify the film bubble, thereby obtaining a film with certain strength and toughness. In addition, in order to prevent the film from shrinking or deforming during the cooling process, the film blowing machine The machine also adopts an advanced tension control system to ensure that the film maintains constant tension and flatness during the winding process. In order to meet the diverse needs of different fields for films, the film blowing machine also has film rings and fans of various specifications and models, which can produce films of different thicknesses, widths and transparencies. At the same time, in order to facilitate subsequent processing and use, the film blowing machine is equipped with an automatic winding device to automatically wind the produced film into rolls. This design not only improves production efficiency, but also reduces the labor intensity of workers. In modern industrial production, the film blowing machine is widely used in packaging, agricultural covering, building waterproofing and other fields with its high efficiency, automation and flexibility. It not only brings convenience and benefits to production and life in all walks of life, but also promotes the continuous innovation and development of the plastic film industry. With the continuous advancement of science and technology and the continuous changes in the market, the film blowing machine will continue to improve and perfect, and provide more advanced and efficient technical support for future industrial production.

[0003] After the film blowing machine completes the film blowing, the winding device of the plastic film needs to ensure a very high automatic winding performance. This is mainly due to the defects of the existing equipment and the necessity of constant force winding. Some automatic winding equipment is not precise enough in tension control, resulting in uneven tightness of the film roll during the winding process, affecting subsequent use. Uneven winding tension will cause the film roll to be unevenly tight during the winding process. Excessive tension may cause delamination of the film edge or wrinkles on the film surface; while too little tension may cause the film roll to relax or even fail to form a tight winding. Constant force winding can ensure that the plastic film maintains a constant tension during the winding process, thereby achieving continuous and stable winding, greatly improving production efficiency, and constant force winding can ensure that the film roll is moderately tight during the winding process, avoiding the problem of material breakage caused by too tight a film roll or material wrinkles caused by too loose a film roll, thereby ensuring the winding quality. Summary of the invention

[0004] (I) Technical problems to be solved: In view of the deficiencies of the prior art, the present invention provides a constant-force automatic winding device for a film roll, which has the advantage of constant-force winding of plastic film and solves the problem that the plastic film is prone to wrinkles when being wound.

[0005] (II) Technical solution: In order to achieve the purpose of the above-mentioned constant force winding of plastic film, the present invention provides the following technical solution: a constant force automatic winding device for a film roll, comprising a support frame base, a crossbeam, a movable roller, a fixed roller and a winding roller, the support frame base is provided with at least 4, and the number is an even number and is symmetrically arranged, the support frame base is provided with a support frame, after the blow molding machine completes the film blowing, the formed plastic film is transported from the guide roller to the fixed roller, and is wound up by the winding roller, the crossbeam is arranged on the support frame, and will be affected by the force, so that the crossbeam itself can move up and down along the support frame, a winding strip is connected under the crossbeam, and the winding strip will be received into the support frame base, during the receiving process The movable roller is arranged on the cross beam and can move with the cross beam. The fixed roller is arranged above the support frame and is fixed in position. There are at least two fixed rollers, and the number of movable rollers is one less than that of the fixed rollers. The fixed rollers and the movable rollers are staggered. The plastic film passes around the fixed rollers and the movable rollers in turn, and the part of the plastic film that is not in contact with the guide roller is arranged in a vertical horizontal plane. A pause component is provided between the fixed roller and the winding roller. After the plastic film passes around the last fixed roller, it passes through the pause component and is wound up by the winding roller. When the winding roller reaches the maximum value and cuts off the plastic film, the pause component can provide tension to the plastic film located in the fixed roller and the movable roller.

[0006] Preferably, the inner side of the fixed roller next to the pause component is a fixed layer and is provided with a negative pressure chamber, and the fixed outer side is provided with a rotating layer driven by a motor, and the rotating layer is provided with air holes, and the air holes are channel-shaped. The cross-section of the negative pressure chamber is fan-shaped and faces the contact position between the fixed roller and the plastic film. When the rotating layer is rotating and the air holes coincide with the negative pressure chamber, the plastic film on the outside will be adsorbed on the rotating layer by the negative pressure.

[0007] Preferably, a winding structure is provided in the support frame base, the winding structure is a spiral clockwork spring and is connected to the winding strip, and a knob capable of adjusting the elastic force of the winding structure is provided on the support frame base.

[0008] Preferably, a winding amount detection component is provided on the winding strip, and when the length of the winding strip received in the winding structure exceeds a set value, the winding device is shut down.

[0009] Preferably, the winding strip is engraved with a length distance.

[0010] Preferably, the pause assembly consists of a top guide roller and a bottom guide roller, and the top guide roller and the bottom guide roller rotate to extrude the plastic film.

[0011] Preferably, the top guide roller has a smaller diameter than the bottom guide roller.

[0012] Preferably, the inner side of the bottom guide roller is a fixed layer, the outer side of the bottom guide roller is provided with a rotating layer driven by a motor, the rotating layer is provided with air holes, the inner side of the bottom guide roller is provided with a positive pressure chamber, the positive pressure chamber is fan-shaped and is internally divided into at least two independent chambers, and the positive pressure chamber faces the outlet side of the pause component, when the rotating layer is rotating, when the air hole and the positive pressure chamber coincide, an outward airflow is generated in the air hole to blow the plastic film upward.

[0013] (III) Beneficial effects: Compared with the prior art, the present invention provides a constant-force automatic winding device for a film roll, which has the following beneficial effects: 1. The constant-force automatic winding device for a film roll realizes constant-force control of the plastic film during the winding process through the coordinated work of a fixed roller, a movable roller and a winding roller. When the winding speed changes, the up and down movement of the beam and the movable roller can be automatically adjusted to maintain the film tension within a stable range. This constant-force winding method helps to reduce the stretching or relaxation of the film during the winding process, thereby avoiding problems such as uneven tightness and uneven thickness of the film roll. When the winding roller is about to complete the winding of a roll of film, the beam can be adjusted by speeding up the winding speed. The body moves upward to disconnect the unwound film and prepare for the unloading of the winding roller. At this time, the pause component will start to replace the winding roller to provide pulling force for the unwound film. As the new film is fed in, the crossbeam will drive the movable roller to move downward to increase the amount of film that can be accommodated. This design that automatically adapts to changes in film volume makes the entire winding process smoother, and film replacement and winding can be completed without stopping, thereby improving production efficiency. Since the device can maintain constant force winding and automatically adapt to changes in film volume, waste and wrinkles caused by unstable film tension can be avoided, which not only improves the quality of the film roll, but also reduces waste in the production process and reduces production costs.

[0014] 2. The constant force automatic winding device of the film roll can accurately control the stiffness of the spring by adjusting the diameter of the winding spring in the winding structure through the knob, thereby adjusting the tension on the winding strip. This adjustment method makes the height adjustment of the beam more flexible and accurate, which helps to achieve more stable film tension control. When the horizontal height of the beam needs to be lowered, the diameter of the winding spring can be increased to increase the tension on the beam to make it move downward. This automated height adjustment mechanism reduces the need for manual intervention and improves production efficiency. The winding amount detection component set on the winding strip can monitor the length of the winding strip received in the winding structure in real time. When the length exceeds the set value, it means that the position of the beam is too low, which may be caused by insufficient winding speed of the winding roller or too long unloading time. At this time, the system can sound an alarm or automatically shut down to avoid excessive accumulation of plastic film and generate waste. By accurately controlling the height and winding speed of the beam, the device can reduce equipment failures caused by unstable film tension or excessive film accumulation, which helps to improve the reliability and stability of the equipment and extend the service life of the equipment.

[0015] 3. The constant force automatic winding device for the film roll is provided with air holes on the rotating layer of the fixed roller and cooperates with the negative pressure chamber. When the rotating layer is rotating, the air holes coincide with the negative pressure chamber, so that an air pressure difference is formed on the upper and lower sides of the plastic film, so that the plastic film located in the negative pressure chamber is adsorbed on the rotating layer under the influence of the air pressure and covers the air holes on the rotating layer, thereby ensuring that the plastic film can fit the fixed roller during the winding process. In the pause component, the air holes on the rotating layer of the bottom guide roller cooperate with the positive pressure chamber. When the air holes coincide with the positive pressure chamber, an outward airflow is generated in the air holes to blow the plastic film upward. This design enables workers to quickly pull the plastic film for the next winding after unloading is completed, thereby improving work efficiency. By dividing a positive pressure chamber into multiple chambers, different air pressures can be set in different chambers to form airflows of different speeds, thereby better blowing up the plastic film. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention.

[0017] Figure 2 Schematic diagram of the crossbeam movement of the present invention Figure 1 .

[0018] Figure 3 Schematic diagram of the crossbeam movement of the present invention Figure 2 .

[0019] Figure 4 It is a schematic diagram of the support frame base structure of the present invention.

[0020] Figure 5 The fixed roller structure of the present invention is schematically shown in FIG. Figure 1 .

[0021] Figure 6The fixed roller structure of the present invention is schematically shown in FIG. Figure 2 .

[0022] Figure 7 It is a schematic diagram of the structure of the pause component of the present invention.

[0023] In the figure: 3, plastic film; 11, movable roller; 12, support frame; 13, crossbeam; 14, support frame base; 21, fixed roller; 22, pause component; 23, winding roller; 141, winding structure; 142, winding strip; 211, rotating layer; 212, air hole; 213, negative pressure chamber; 214, positive pressure chamber; 221, top guide roller; 222, bottom guide roller. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-Figure 3 The film roll constant force automatic winding device includes a support frame base 14, a crossbeam 13, an active roller 11, a fixed roller 21 and a winding roller 23. The support frame base 14 is provided with at least 4, and the number is an even number and is symmetrically arranged. A support frame 12 is provided on the support frame base 14. After the blow molding machine completes film blowing, the formed plastic film 3 is transported from the guide roller to the fixed roller 21 and is wound by the winding roller 23. The crossbeam 13 is arranged on the support frame 12 and will be affected by force so that the crossbeam 13 itself can move up and down along the support frame 12. A winding strip 142 is connected below the crossbeam 13. The winding strip 142 will be collected in the support frame base 14 and can generate tension on the crossbeam 13 during the collection process. The active roller 11 is arranged on The plastic film 3 is disposed on the crossbeam 13 and can move with the crossbeam 13. The fixed roller 21 is arranged above the support frame 12 and is fixed in position. At least two fixed rollers 21 are provided, and the number of movable rollers 11 is one less than that of the fixed rollers 21. The fixed rollers 21 and the movable rollers 11 are arranged alternately. The plastic film 3 bypasses the fixed rollers 21 and the movable rollers 11 in sequence, and the portion of the plastic film 3 that is not in contact with the guide roller is arranged in a vertical horizontal plane. A pause component 22 is provided between the fixed roller 21 and the winding roller 23. After the plastic film 3 bypasses the last fixed roller 21, it passes through the pause component 22 and is wound up by the winding roller 23. When the winding roller 23 reaches the maximum value and cuts off the plastic film 3, the pause component 22 can provide tension to the plastic film 3 located between the fixed roller 21 and the movable roller 11.

[0026] The blow-molded plastic film 3 is fed into the winding device, and the movable roller 11 fixed on the cross beam 13 will be affected by gravity and move downward along the direction of the support frame 12. The fixed roller 21 is fixed in position, and the film to be wound up is passed downward from the upper side of the fixed roller 21 and passed upward from the lower side of the movable roller 11. After passing through the pause component 22, it is wound up by the winding roller 23. When the winding speed is slow, the upward pulling force provided to the film will be reduced, so that the cross beam 13 is affected by its own gravity and the downward pulling force provided by the winding strip 142, which will drive the cross beam 13 and the movable roller 11 on the cross beam 13 to move downward, and one end of the winding strip 142 is retracted with the support frame base 14. The winding structure 141 is connected to the crossbeam 13 at the other end, and the crossbeam 13 is pulled downward by the force generated by the winding structure 141 when the winding strip 142 is wound. When it is in a balanced state, the crossbeam 13 is fixed at a height on the support frame 12. At the same time, the tension generated by the winding roller 23 when the film is wound and the downward tension provided by the movable roller 11 to the film are balanced, so that the plastic film 3 can be wound at a constant force during the entire winding process. When the winding roller 23 is about to complete the winding, the winding speed can be increased to make the crossbeam 13 move upward as a whole, disconnect the unwound film, and unload the winding roller 23. At this time, the pause component 22 is started to replace the winding roller 2 3 provides tension to the unwound film. As the film is continuously fed into the fixed roller 21 and the movable roller 11, the crossbeam 13 drives the movable roller 11 to move downward. While increasing the amount of film entering the device, the film is kept in a balanced state of force, so that it is flat and wrinkle-free, and the winding quality is improved. Subsequently, the unwound film at the pause component 22 is placed in the winding roller 23 for winding. The above steps are repeated for the next winding. During the overall winding process, there is no need to stop the machine. The movable roller 11 is driven downward by the crossbeam 13 to increase the amount of plastic film 3 that can be accommodated between the movable roller 11 and the fixed roller 21, and the pause component 22 replaces the winding roller 23 to provide tension, so that the film can be wound again. After the winding is completed, when the second winding is carried out, waste will not be generated due to non-stopping, or the plastic film 3 will be wrinkled. The constant force automatic winding device of the film roll realizes constant force winding of the plastic film 3 through the staggered arrangement of the active roller 11 and the fixed roller 21 and the up and down movement of the crossbeam 13. Its beneficial effect is that it reduces the problem of uneven tightness of the film roll and improves the winding quality; at the same time, it automatically adapts to the change of film amount and can complete the film replacement without stopping, thereby improving production efficiency and reducing production costs. The part of the plastic film 3 that is not in contact with the guide roller is arranged in a vertical horizontal plane, so that the contact angle of the plastic film 3 with the active roller does not change when the active roller moves, thereby ensuring constant force.

[0027] See also Figure 4The support frame base 14 is provided with a winding structure 141, and the winding structure 141 is a spiral spring connected to a winding strip 142. The support frame base 14 is provided with a knob capable of adjusting the elastic force of the winding structure 141. The diameter of the winding spring in the winding structure 141 is adjusted by the knob. The spring diameter is changed by space limitation. Increasing the spring diameter can increase its stiffness, thereby enhancing the elastic force. Reducing the diameter will reduce the stiffness and weaken the elastic force. When the horizontal height of the beam 13 needs to be lowered, the diameter of the winding spring of the winding structure 141 is increased, so that the pulling force of the winding strip 142 on the beam 13 is increased, causing it to move downward. The winding strip 142 A winding amount detection component is provided. When the length of the winding strip 142 received in the winding structure 141 exceeds the set value, it indicates that the position of the beam 13 is too low, the winding speed of the winding roller 23 is insufficient or the unloading time is too long, and the entire equipment needs to be shut down to avoid excessive accumulation of the plastic film 3 and the generation of waste. The winding strip 142 is engraved with a length distance. The winding structure 141 and the winding amount detection component further improve the performance of the constant force automatic winding device for the film roll, and the flexible control of the height of the beam 13 is achieved by precisely adjusting the diameter of the clockwork spring. The winding amount detection component effectively prevents excessive accumulation of the plastic film 3, reduces the generation of waste, and improves the reliability and stability of the equipment.

[0028] See also Figure 5-Figure 6 The inner side of the fixed roller 21 next to the pause component 22 is a fixed layer and is provided with a negative pressure chamber 213. The outer side of the fixed roller 21 is provided with a rotating layer 211 driven to rotate by a motor. The rotating layer 211 is provided with air holes 212, and the air holes 212 are channel-shaped. The cross-section of the negative pressure chamber 213 is fan-shaped and faces the contact position between the fixed roller 21 and the plastic film 3. When the rotating layer 211 is rotating, the air holes 212 coincide with the negative pressure chamber 213, so that an air pressure difference is formed on the upper and lower sides of the plastic film 3. Because the air pressure in the negative pressure chamber 213 is low and the air pressure on the upper side of the plastic film 3 is high, the plastic film 3 located at the negative pressure chamber 213 is affected by the air pressure and adsorbed on the rotating layer 211, and covers the air holes 212 on the rotating layer 211 (such as Figure 5-Figure 6 As shown in the figure, the negative pressure in the negative pressure chamber 213 can be formed by exhausting air, and the negative pressure chamber 213 is provided with an exhaust device or a channel for gas to flow out to maintain a negative pressure state, so that the plastic film 3 located at the position of the negative pressure chamber 213 can remain adsorbed on the fixed roller 21.

[0029] See also Figure 7The pause assembly 22 is composed of a top guide roller 221 and a bottom guide roller 222. The top guide roller 221 and the bottom guide roller 222 rotate to extrude the plastic film 3. The top guide roller 221 has a smaller diameter than the bottom guide roller 222. The inner side of the bottom guide roller 222 is a fixed layer. The outer side of the bottom guide roller 222 is provided with a rotating layer 211 driven by a motor to rotate. The rotating layer 211 is provided with air holes 212. The inner side of the bottom guide roller 222 is provided with a positive pressure chamber 214. The positive pressure chamber 214 is fan-shaped and is divided into at least two independent chambers. , and the positive pressure chamber 214 faces the outlet side of the pause component 22. When the rotating layer 211 is rotating, when the air hole 212 and the positive pressure chamber 214 coincide with each other, an outward airflow is generated in the air hole 212 to blow the plastic film 3 upward, so that after the unloading of the winding roller 23 is completed, the worker can quickly pull the plastic film 3 onto the winding roller 23 for the next winding. At the same time, by dividing a positive pressure chamber 214 into multiple chambers, different air pressures can be set in different chambers to form airflows of different speeds, so as to better blow up the plastic film 3.

[0030] The negative pressure and positive pressure chamber design in the fixed roller 21 and the pause component 22 provides efficient adsorption and transmission functions for the plastic film 3. This design not only ensures the stability of the plastic film 3 during the transmission process, but also realizes the flexible suspension and release of the plastic film 3, thereby improving work efficiency. At the same time, the flexible regulation of air pressure and the compact structural design make the equipment easier to maintain and use.

[0031] Working principle: The blow-molded plastic film 3 is fed into the winding device. The movable roller 11 fixed on the crossbeam 13 will be affected by gravity and move downward along the direction of the support frame 12. The fixed roller 21 is fixed in position. The film to be wound goes around from the upper side of the fixed roller 21 downward, and goes around from the lower side of the movable roller 11 upward. After passing through the pause component 22, it is wound by the winding roller 23. When the winding speed is slow, the upward pulling force provided to the film will be reduced, so that the crossbeam 13 is affected by its own gravity and the downward pulling force provided by the winding strip 142. The cross beam 13 and the movable roller 11 on the cross beam 13 will be driven to move downward. One end of the winding strip 142 is connected to the winding structure 141 in the support frame base 14, and the other end is connected to the cross beam 13. The cross beam 13 is pulled downward by the force generated by the winding structure 141 when the winding strip 142 is wound. When it is in a balanced state, the cross beam 13 is fixed at a height on the support frame 12. At the same time, the tension generated by the winding roller 23 when the film is wound and the downward tension provided by the movable roller 11 on the film are balanced, so that the film can be rolled up in the whole winding process. During the process, the plastic film 3 can be rolled up with constant force. When the winding roller 23 is about to complete the winding, the winding speed can be accelerated to make the crossbeam 13 move upward as a whole, disconnect the unwound film, and unload the winding roller 23. At this time, the pause component 22 is started to replace the winding roller 23 to provide tension for the unwound film. As the film is continuously fed into the fixed roller 21 and the movable roller 11, the crossbeam 13 drives the movable roller 11 to move downward, while increasing the amount of film entering the device, the film is kept in a balanced state of force, making it flat and wrinkle-free. To improve the quality of winding, the unwound film at the pause component 22 is then placed in the winding roller 23 for winding, and the above steps are repeated for the next winding. During the overall winding process, there is no need to stop the machine. The movable roller 11 is driven downward by the crossbeam 13 to increase the amount of plastic film 3 that can be accommodated between the movable roller 11 and the fixed roller 21. The pause component 22 replaces the winding roller 23 to provide tension, so that after the winding is completed, when the second winding is performed, no waste is generated due to not stopping the machine, or the plastic film is wrinkled.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A constant force automatic film roll winding device, comprising a support frame base (14), a crossbeam (13), a movable roller (11), a fixed roller (21) and a winding roller (23), wherein the support frame base (14) is provided with at least four, and the number of the support frame bases (14) is an even number and is symmetrically arranged, and a support frame (12) is provided on the support frame base (14). After the blow molding machine completes film blowing, the formed plastic film (3) is transported from the guide roller to the fixed roller (21) and is wound up by the winding roller (23), and the characteristics are: The crossbeam (13) is arranged on the support frame (12) and can move up and down along the support frame (12); a winding strip (142) is connected below the crossbeam (13); the winding strip (142) is received in the support frame base (14) and can generate a pulling force on the crossbeam (13) during the receiving process; the movable roller (11) is arranged on the crossbeam (13) and can move together with the crossbeam (13); the fixed roller (21) is arranged above the support frame (12) and is fixed in position; at least two fixed rollers (21) are provided, and the number of movable rollers (11) is one less than that of fixed rollers (21); and the fixed rollers (21) are provided at least two times. The rollers (21) and the movable rollers (11) are arranged alternately, and the plastic film (3) bypasses the fixed rollers (21) and the movable rollers (11) in sequence, and the portion of the plastic film (3) that is not in contact with the guide roller is arranged in a vertical horizontal plane. A pause component (22) is provided between the fixed rollers (21) and the winding roller (23). After the plastic film (3) bypasses the last fixed roller (21), it passes through the pause component (22) and is wound by the winding roller (23). When the winding roller (23) reaches a maximum value and cuts off the plastic film (3), the pause component (22) can provide a pulling force to the plastic film (3) located between the fixed roller (21) and the movable roller (11).

2. The film roll constant force automatic winding device according to claim 1, characterized in that: The inner side of the fixed roller (21) next to the pause component (22) is a fixed layer and is provided with a negative pressure chamber (213). The outer side of the fixed roller (21) is provided with a rotating layer (211) driven to rotate by a motor. The rotating layer (211) is provided with air holes (212). The air holes (212) are channel-shaped. The cross-section of the negative pressure chamber (213) is fan-shaped and faces the contact position between the fixed roller (21) and the plastic film (3). When the rotating layer (211) is rotating and the air holes (212) and the negative pressure chamber (213) overlap, the plastic film (3) located on the outer side is adsorbed on the rotating layer (211) by the negative pressure.

3. The constant force automatic winding device for a film roll according to claim 1 is characterized in that: A winding structure (141) is provided in the support frame base (14); the winding structure (141) is a spiral spring and is connected to a winding strip (142); and a knob capable of adjusting the elastic force of the winding structure (141) is provided on the support frame base (14).

4. The constant force automatic winding device for a film roll according to claim 3 is characterized in that: The winding strip (142) is provided with a winding amount detection component, and when the length of the winding strip (142) wound into the winding structure (141) exceeds a set value, the winding device is shut down.

5. The constant force automatic winding device for a film roll according to claim 3 is characterized in that: The winding strip (142) is engraved with a length.

6. The constant force automatic winding device for a film roll according to claim 2, characterized in that: The pause assembly (22) is composed of a top guide roller (221) and a bottom guide roller (222), and the top guide roller (221) and the bottom guide roller (222) rotate to extrude the plastic film (3).

7. The film roll constant force automatic winding device according to claim 6, characterized in that: The top guide roller (221) has a smaller diameter than the bottom guide roller (222).

8. The constant force automatic winding device for a film roll according to claim 6, characterized in that: The inner side of the bottom guide roller (222) is a fixed layer, and the outer side of the bottom guide roller (222) is provided with a rotating layer (211) driven to rotate by a motor, and the rotating layer (211) is provided with an air hole (212). The inner side of the bottom guide roller (222) is provided with a positive pressure chamber (214), the positive pressure chamber (214) is fan-shaped and is internally divided into at least two independent chambers, and the positive pressure chamber (214) faces the outlet side of the pause component (22), and when the rotating layer (211) is rotating, when the air hole (212) and the positive pressure chamber (214) overlap, an outward airflow is generated in the air hole (212), and the plastic film (3) is blown upward.

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