Film tension adjusting device and adjusting method thereof
By combining upper and lower tension detection rollers with a swing motor, the problem of film tension fluctuation during the replacement of old and new film rolls was solved, thus achieving stability of film tension and improving production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-16
- Publication Date
- 2026-03-06
AI Technical Summary
Traditional film tension adjustment devices are unable to effectively handle large tension fluctuations during the replacement of old and new films, resulting in film loosening or tightening, which affects production efficiency and product quality.
The upper and lower tension detection rollers, along with a swing motor and tension sensor, are used to adjust the film tension by moving up and down and swinging at small angles, ensuring that the film maintains constant tension during the replacement of old and new film rolls.
This technology ensures the stability of film tension during the replacement of old and new film rolls, reduces film loosening and tensioning, and improves production efficiency and product quality.
Smart Images
Figure CN121609149A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of roll material unloading equipment, and in particular to a film tension regulating device and its regulating method. Background Technology
[0002] Tension adjustment of the unwinding machine is a key technology to ensure stable tension of the rolled material during processing. Maintaining constant tension during unwinding prevents material loosening, wrinkling, or stretching deformation caused by tension fluctuations. Its basic principle is to dynamically adjust the torque or speed of the unwinding shaft through closed-loop feedback or indirect compensation to offset tension deviations caused by factors such as changes in roll diameter and material properties.
[0003] Traditional tension sensors only adjust the tension of the film during transportation. When new and old films are continuously replaced on the unwinding machine, the tension of the film during transportation is greatly affected by the tension generated by the movement of the rollers in the unwinding machine and the loosening caused by the movement of the old film roll to the new film roll. Compared with traditional tension adjustment, which only adjusts the speed of the drive motor by coordinating the tension detection roller and the tension detection sensor to compensate for tension fluctuations, it is difficult to handle the tension fluctuations caused by large tension or loosening of the film. Summary of the Invention
[0004] This invention provides a film tension adjustment device and its adjustment method, which can solve the problem that the method of adjusting the speed of the drive motor by coordinating the tension detection roller and the tension detection sensor to compensate for tension fluctuations is difficult to handle the tension fluctuations caused by large tension or loosening of the film.
[0005] One of the objectives of this invention is achieved through the following technical solution: In a first aspect, this application provides a film tension adjustment device, including a tension adjustment mechanism and an unwinding mechanism, wherein the tension adjustment mechanism adjusts the tension of the film on the unwinding mechanism, and the tension adjustment mechanism is mounted on the body of the unwinding mechanism; The tension adjustment mechanism includes an upper tension detection roller and a lower tension detection roller. The upper tension detection roller is located above the lower tension detection roller. The film is adhered to the right side of the upper tension detection roller, passes between the upper and lower tension detection rollers, adheres to the left side of the lower tension detection roller, and extends outward from the bottom of the lower tension detection roller. When the unwinding mechanism changes rolls, the upper tension detection roller moves in the direction of film advance to maintain the film in a taut state. After the unwinding mechanism completes the roll change, the upper tension detection roller resets, and the tension of the film is adjusted by the lower tension detection roller to keep the film in a constant tension state.
[0006] A further aspect of the present invention is that the tension adjustment mechanism further includes an elastic telescopic rod, a transverse groove is provided on the machine body, and extension rods are fixedly connected to both ends of the upper tension detection roller. The extension rods are slidably disposed in the transverse groove and one end extends to the outside of the machine body. One end of the elastic telescopic rod is rotatably connected to the extension rod through a bearing. A No. 3 cylinder is fixedly installed on the machine body, and the output end of the No. 3 cylinder is fixedly connected to one end of the elastic telescopic rod.
[0007] A further aspect of the present invention is that the tension adjustment mechanism further includes a swing motor, a vertical arc-shaped groove is provided on the machine body, and extension rods are fixedly connected to both ends of the lower tension detection roller. The extension rods are slidably disposed in the arc-shaped groove and one end extends to the outside of the machine body. One end of the extension rod is rotatably connected to a sleeve rod through a bearing. The swing motor is fixedly installed on the machine body, and the output end of the swing motor is fixedly connected to one end of the sleeve rod, driving the lower tension detection roller to swing up and down.
[0008] A further aspect of the present invention is that the tension adjustment mechanism further includes a tension sensor, which is respectively mounted on the extension rod and the extension extension rod, and the tension sensor is signal-connected to the upper tension detection roller and the lower tension detection roller.
[0009] A further aspect of the present invention is that the unwinding includes a machine body and a glue coating machine, the machine body including a mounting roller, a moving assembly, and a pushing assembly; The mounting roller is used to mount the film roll; The two sets of moving components are respectively located above and below the machine body. The mounting roller is mounted on the moving components. When the film roll on the upper mounting roller is about to run out, the moving components drive the upper mounting roller to move downward and at the same time drive the film roll on the lower mounting roller to move upward. After being coated with glue by the glue applicator, the film on the film roll on the lower mounting roller is bonded to the film roll on the upper mounting roller. The two sets of pushing components are respectively located above and below the machine body. The pushing components include pressure rollers. When the film roll on the upper mounting roller is about to run out, the pressure roller moves towards the upper mounting roller and moves directly below the upper mounting roller, driving the film on the film roll on the upper mounting roller to move to the film surface on the lower mounting roller.
[0010] A further aspect of the present invention is that: the moving component includes a threaded rod; two vertically symmetrical fixed long plates are fixedly installed on one side of the machine body; guide rail grooves are provided on the fixed long plates; a moving seat is slidably arranged in the guide rail grooves; sliding grooves are provided on both sides of the fixed long plates; the threaded rod is rotatably disposed in the sliding grooves via bearings; the moving seat is slidably disposed in the sliding grooves on both sides and threadedly connected to the threaded rod; a servo motor is fixedly installed on the fixed long plates; the output end of the servo motor is fixedly connected to one end of the threaded rod; a drive motor is fixedly installed on one side of the moving seat; and an installation roller is rotatably mounted on the moving seat via bearings; the output end of the drive motor is fixedly connected to one end of the installation roller. The moving component also includes a movable seat. Two symmetrical fixed short plates are fixedly installed on the other side of the body. Guide grooves are provided on the fixed short plates. The movable seat is slidably disposed in the guide grooves. A cylinder is fixedly installed on the top of the fixed short plates. The output end of the cylinder extends into the guide groove and is fixedly connected to the movable seat.
[0011] A further aspect of the present invention is that: a winding roller is provided at the axis of the film roll, and both ends of the winding roller are provided with ports, the diameter of which is larger than the diameter of the winding roller; a positioning component for positioning the mounting roller is provided between the movable seat and the movable seat; the positioning component includes an annular plate and a sleeve; the annular plate is fixedly installed on the outer periphery of the mounting roller; a circular hole is provided on one side of the movable seat; the sleeve is slidably disposed in the circular hole; a second cylinder is fixedly connected to one side of the movable seat; the output end of the second cylinder is fixedly connected to one end of the sleeve; the second cylinder drives the sleeve to move forward, thereby driving the film roll to move towards the movable seat, so that the sleeve and the annular plate respectively enter the ports at both ends of the winding roller.
[0012] A further aspect of the present invention is that: the pushing assembly further includes connecting rods, the pressure rollers are disposed between the two connecting rods, and both ends are rotatably connected to the ends of the connecting rods via bearings; guide grooves are provided on both sides of the machine body, and guide plates are slidably disposed in the guide grooves; one end of the connecting rod is hinged to the guide plate; a third cylinder is fixedly installed on the machine body, and the output end of the third cylinder is fixedly connected to the guide plate; the film of the film roll is located between the two pressure rollers.
[0013] A swing motor is fixedly installed on the guide plate, and the output end of the swing motor is fixedly connected to one end of the connecting rod.
[0014] A further aspect of the present invention is that the coating machine includes a motion mechanism and a dispensing head. Before the moving component drives a new film roll for replacement, the motion mechanism drives the dispensing head to apply adhesive to the port of the film on the film roll.
[0015] Secondly, this application provides a method for adjusting a thin film tension adjusting device, which is applied to the aforementioned thin film tension adjusting device. The method for adjusting a thin film tension adjusting device includes the following steps: When the unwinding mechanism changes the film roll, the moving component drives the film roll on the upper mounting roller to move downward. At this time, the film inside the machine body is in a relaxed state, pushing the pressure roller in the component to move towards the film roll, so that the film between the film roll and the pressure roller is put back into a tensioned state. At the same time, the upper tension detection roller moves forward, so that the film between the pressure roller and the upper tension detection roller, as well as the film after the upper tension detection roller, is in a tensioned state.
[0016] After the unwinding mechanism replaces the film, as the film on the film roll on the mounting roller is continuously consumed, the distance between the port of the film conveyor on the film roll and the pressure roller continuously increases, and the tensile force of the film increases. This causes the upper tension detection roller to move backward to adjust the tension of the film. At the same time, the output of the servo motor is adjusted through the lower tension detection roller to compensate for the tension fluctuation of the film. Meanwhile, the lower tension detection roller swings up and down slightly to give the film an adaptive tension.
[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) During the continuous replacement of old and new film rolls by the unwinding machine, when the old film roll continues to move downwards, the film as a whole is in a loose state throughout the transportation process. At this time, it is difficult to quickly restore the tension of the film by adjusting the speed of the drive motor. As a result, when the rewinding machine rewinds the film roll, the film roll will become loose after winding. When the tension detection roller detects a change in the surface tension of the film, it does not change the speed of the drive motor, but controls the tension detection roller itself to move in the direction of film movement, thereby quickly adjusting the tension of the film and compensating for the tension fluctuation of the film during transportation. As the old film roll continues to move downwards and the pressure roller continues to move towards the old film roll, the tension of the film is affected by the coefficient of friction, resulting in tension fluctuations. In order to ensure that the rotation speed of the old and new film rolls is the same when they are replaced, since the rotation speed of the old film roll cannot be adjusted to compensate for the tension fluctuations, a swing motor drives the tension detection roller to swing back and forth at a small angle to compensate for the tension fluctuations of the film. This solves the problem that it is difficult to handle the tension fluctuations caused by large tension or loosening of the film by adjusting the speed of the drive motor in coordination between the tension detection roller and the tension detection sensor.
[0018] (2) In the unwinding mechanism, the old film roll moves continuously downward and the pressure roller moves synchronously in the direction of the pressure roller. Since the speed and distance of the two are different, the tension of the film will fluctuate during the movement. Since the rotation speed of the new film roll is constant during the uninterrupted replacement of the old film roll and the new film roll, the rotation speed of the old film roll will change due to the fluctuation of the film tension. When the rotation speed of the old film roll is faster than that of the new film roll, misalignment occurs when the two are bonded. As a result, the adhesive on the film port of the new film roll overflows to the position outside the bonding area during the misalignment, which leads to the problem of adhesion between the two layers of film during subsequent winding. When the rotation speed of the old film roll is slower than that of the new film roll, the new film roll rotates faster after they are bonded together. This can cause the film on the old film roll to loosen during transportation, resulting in uneven winding density during subsequent winding. Therefore, it is necessary to ensure that the rotation speeds of the old and new film rolls are the same during the replacement process. Thus, while the upper tension adjusting roller quickly adjusts the film tension, a lower tension adjusting roller is set up. The lower tension adjusting roller detects the changes in film tension and swings up and down to adjust, in order to compensate for the tension fluctuations of the film during transportation, thereby ensuring that the old film roll can maintain a synchronous speed with the new film roll during rotation. Attached Figure Description
[0019] Figure 1 This is one of the overall structural schematic diagrams of the present invention; Figure 2 This is the second schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the front internal structure of the fuselage of the present invention; Figure 4 This is a schematic diagram of the internal rear structure of the fuselage of the present invention; Figure 5 This is a schematic diagram of the pushing component structure of the present invention; Figure 6 This is a schematic diagram of the tension adjustment mechanism of the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the structure of section A; Figure 8 This is a schematic diagram of the positioning component structure of the present invention; Figure 9 For the present invention Figure 8 Schematic diagram of section B in the middle; Figure 10 For the present invention Figure 8 Schematic diagram of the C-section structure; Figure 11 This is a schematic diagram of the expansion component structure of the present invention; Figure 12 For the present invention Figure 11 Schematic diagram of the structure of section D.
[0020] In the diagram: 1. Machine body; 2. Glue applicator; 21. Motion mechanism; 22. Dispensing head; 3. Film roll; 31. Roller; 32. Port; 100. Mounting roller; 200. Moving assembly; 201. Threaded rod; 202. Fixed long plate; 203. Guide rail groove; 204. Moving seat; 205. Sliding groove; 206. Servo motor; 207. Drive motor; 208. Movable seat; 209. Fixed short plate; 210. Guide groove; 211. Cylinder No. 1; 300. Pushing assembly; 301. Pressure roller; 302. Connecting rod; 303. Guide groove; 304. Guide plate; 305. Swing motor; 306. Cylinder No. 3; 400. Positioning assembly; 401. Ring 402. Shaped plate; 403. Sleeve; 404. Cylinder No. 2; 505. Tension adjustment mechanism; 506. Upper tension detection roller; 507. Lower tension detection roller; 508. Elastic telescopic rod; 509. Transverse groove; 500. Extension rod; 501. Cylinder No. 4; 502. Swing motor; 503. Arc groove; 504. Extension rod; 515. Sleeve rod; 516. Tension sensor; 607. Correction mechanism; 608. Movable ring plate; 609. Fixed ring plate; 610. Expansion piece; 611. Collar ring; 612. Pad; 613. Hinge rod; 614. Extension plate; 615. Roller; 620. Adjusting piece; 621. Correction sensor; 622. Air-bearing guide rail. Detailed Implementation
[0021] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.
[0022] Example 1
[0023] like Figures 1 to 5 As shown, an embodiment of the present invention provides a film unwinding mechanism, including a machine body 1 and a coating machine 2. The machine body 1 includes a mounting roller 100, a moving component 200 and a pushing component 300. Mounting roller 100 is used to mount film roll 3; Two sets of moving components 200 are respectively located above and below the machine body 1. The mounting roller 100 is mounted on the moving components 200. When the film roll 3 on the upper mounting roller 100 is about to run out, the moving components 200 drive the upper mounting roller 100 to move downward, and at the same time drive the film roll 3 on the lower mounting roller 100 to move upward. After being coated with glue by the glue applicator 2, the film on the film roll 3 on the lower mounting roller 100 is bonded to the film on the film roll 3 on the upper mounting roller 100. Two sets of pushing components 300 are respectively located above and below the machine body 1. The pushing component 300 includes a pressure roller 301. When the film roll 3 on the upper mounting roller 100 is about to run out, the pressure roller 301 moves towards the upper mounting roller 100 and moves to directly below the upper mounting roller 100.
[0024] When the film roll 3 on the mounting roller 100 above the machine body 1 is about to be exhausted, the difference in diameter between the initial state and the state of exhaustion of the film roll 3 causes the film between the end of the mounting roller 100 and the end of the pressure roller 301 to be in an inclined state. At this time, the moving component 200 above the machine body 1 drives the upper mounting roller 100 to move downward, and at the same time pushes the pressure roller 301 in the component 300 to move towards the mounting roller 100. When the pressure roller 301 moves directly below the old film roll 3, the lower moving component 200 drives the new film roll 3 to move upward. At the designated position, and during the movement, the dispensing machine applies adhesive to the film interface of the new film roll 3. When the new film roll 3 moves to the designated position, the adhesive-coated film interface of the new film roll 3 adheres to the film at the bottom of the pressure roller 301. After adhesion, the film on the old film roll 3 is exhausted, so that the film on the old film roll 3 is continuously replaced. When the film replacement between the old film roll 3 and the new film roll 3 is completed, the moving component 200 drives the old film roll 3 to move upward to facilitate the replacement of the old film roll 3, and at the same time, the pressure roller 301 above resets.
[0025] Traditional unwinding machines require stopping the machine to replace film roll 3. This involves a series of steps, including swapping the positions of the old and new film roll 3, hot-melt bonding, and cutting the film roll 3. This process is complex and inefficient. Furthermore, cutting the old film roll 3 leaves some film roll 3 residue on each roll, resulting in material waste. Another method is continuous replacement. However, this process can easily cause excessive tension on the film, leading to film damage and excessive distance between the old and new film roll 3. As a result, after the old film roll 3 is released, a long section of film becomes wrinkled or curled. This leads to a long, irregular stretch of film thickness after the old and new film roll 3 are bonded together.
[0026] In contrast, this application sets two sets of film rolls 3 on the machine body 1. When the old film roll 3 is about to be exhausted, it moves downward. To prevent the film from loosening during the movement, the pressure roller 301 moves towards the old film roll 3, so that the film is still in a taut state. At the same time, due to the diameter difference between the original state and the state when the film roll 3 is about to be fully released, when the film on the old film roll 3 is about to be fully released, the pressure roller 301 adjusts the film tension and moves directly below the old film roll 3. After the pressure roller 301 stabilizes, the glue applicator 2 applies glue to the new film roll 3 and drives the new film roll 3 to move upward through the moving component 200, so that the film on the new film roll 3 is bonded to the film on the old film roll 3, thereby completing the uninterrupted replacement between the old and new film rolls 3. Thus, this invention can quickly realize the replacement of the old and new film rolls 3 without stopping the unwinding machine.
[0027] Since the old and new film rolls 3 are in a parallel and vertical position in this invention, when replacing the old and new film rolls 3, because the initial diameter of the unwinding machine's film roll 3 is too large, in order to maximize the amount of film wound on the winding roller 31, the thickness of its winding roller 31 will not be too thick. As the film on the film roll 3 continues to be output outward, its diameter will continuously decrease. When the film on the old film roll 3 is about to be consumed, the diameter of the old film roll 3 is much smaller than the initial diameter. When the old film roll 3 moves downward to the bottom end through the moving component 200, it is subjected to the influence of the old film roll 3... Due to the limitation of the roller 31, the film unwound from the old film roll 3 can never be properly bonded to the top of the new film roll 3 when it reaches the designated position. As the new film roll 3 continues to move upward to meet the old film roll 3, the tension of the new film roll 3 will change after the old and new film rolls 3 are replaced. At this time, it is necessary to re-detect the tension of the film roll 3 by the tension sensor 511 and reset the tension adjustment zone value. In addition, the position of the new film roll 3 also needs to be readjusted, which is complicated. Therefore, it is necessary to use the movement of the pressure roller 301 to bond the old and new film rolls 3.
[0028] See also Figures 1 to 4 As shown, the moving component 200 includes a threaded rod 201. Two vertically symmetrical fixed long plates 202 are fixedly installed on one side of the machine body 1. The fixed long plates 202 have guide rail grooves 203. A moving seat 204 is slidably installed in the guide rail grooves 203. Sliding grooves 205 are opened on both sides of the fixed long plates 202. The threaded rod 201 is rotatably disposed in the sliding grooves 205 through bearings. The moving seats 204 are slidably disposed in the sliding grooves 205 on both sides and are threadedly connected to the threaded rod 201. A servo motor 206 is fixedly installed on the fixed long plates 202. The output end of the servo motor 206 is fixedly connected to one end of the threaded rod 201. A drive motor 207 is fixedly installed on one side of the moving seat 204. An installation roller 100 is rotatably mounted on the moving seat 204 through bearings. The output end of the drive motor 207 is fixedly connected to one end of the installation roller 100. When controlling the film roll 3 to move up and down, the servo motor 206 drives the threaded rod 201 to rotate. Through the threaded connection between the threaded rod 201 and the moving seat 204, the moving seat 204 is driven to move up and down, thereby controlling the movement of the film roll 3 installed on the mounting roller 100 on the fixed long plate 202.
[0029] See also Figures 1 to 4 as well as Figures 9 to 11As shown, when controlling the rotation of the membrane roll 3, the other end of the membrane roll 3 needs to be fixed. The moving assembly 200 also includes a movable seat 208. Two vertically symmetrical fixed short plates 209 are fixedly installed on the other side of the machine body 1. The fixed short plates 209 are provided with guide grooves 210. The movable seat 208 is slidably disposed in the guide grooves 210. A cylinder 211 is fixedly installed on the top of the fixed short plate 209. The output end of the cylinder 211 extends into the guide grooves 210 and is fixedly connected to the movable seat 208. A winding roller 31 is provided at the axis of the membrane roll 3. Both ends of the winding roller 31 are provided with ports 32. The diameter of the ports 32 is larger than the diameter of the winding roller 31. The moving seat 208 is also provided with guide grooves 210. A positioning component 400 for positioning the mounting roller 100 is provided between the 4 and the movable seat 208. The positioning component 400 includes an annular plate 401 and a sleeve 402. The annular plate 401 is fixedly installed on the outer periphery of the mounting roller 100. A circular hole is opened on one side of the movable seat 208. The sleeve 402 is slidably disposed in the circular hole. A second cylinder 403 is fixedly connected to one side of the movable seat 208. The output end of the second cylinder 403 is fixedly connected to one end of the sleeve 402. The second cylinder 403 drives the sleeve 402 to move forward, driving the film roll 3 to move towards the movable seat 204, so that the sleeve 402 and the annular plate 401 respectively enter the ports 32 at both ends of the roller 31. When the moving component 200 moves the film roll 3 to the designated position, the second cylinder 403 moves the sleeve 402 forward, so that the sleeve 402 and the annular plate 401 simultaneously enter the ports 32 at both ends of the roller 31, thereby fixing the two ends of the film roll 3. When the drive motor 207 drives the mounting roller 100 to rotate, since the sleeve 402 and the annular plate 401 are both located in the ports 32 at both ends of the roller 31, the rotation of the mounting roller 100 drives the annular plate 401 to rotate, thereby driving the film roll 3 to rotate. Meanwhile, in order to drive the membrane roll 3 downward when it is about to run out, a fixed short plate 209 is installed on the other side of the machine body 1, and the movable seat 208 is slidably disposed in the guide groove 210 in the fixed short plate 209. When the membrane roll 3 is about to run out and needs to move downward, the membrane roll 3 is driven downward through the threaded connection between the movable seat 204 and the threaded rod 201 in the movable component 200, and the setting of the output end of the first cylinder 211 being installed on the top of the movable seat 208. Both ends move downward at the same time, ensuring the stability of the membrane roll 3 when it moves downward. Simultaneously, the setting to move downwards when membrane roll 3 is about to be exhausted is to reduce the area of wrinkles or curling between the two layers of film during the replacement of old and new membrane roll 3. Traditional non-stop membrane roll 3 replacement methods require rotating the old roll backward while the new roll rotates forward and positions itself in the old roll's place, allowing the films to adhere and enabling uninterrupted replacement. However, due to the size of the rolls themselves and the need for rotation, a significant distance inevitably exists between the two rolls. Because of this large gap, when the old roll is fully released, a section of film between the old and new rolls lacks support, causing elastic shrinkage or plastic deformation, resulting in wrinkles or curling. When this wrinkled or curled film adheres to the film between the new roll, it leads to problems such as increased film thickness in this section. In this application, after the old film roll 3 moves downward, the distance between the old film roll 3 and the pressure roller 301 is reduced. This makes the length of the joint between the two films during the replacement process between the old and new film rolls 3 much smaller than the length of the joint between the two films when the old film roll 3 is in its original position. This minimizes the area of wrinkles or curls between the two films during the replacement of the old and new film rolls 3.
[0030] See also Figures 5 to 6 As shown, in order to realize the movement of the pressure roller 301, the pushing assembly 300 also includes a connecting rod 302. The pressure roller 301 is located between the two connecting rods 302, and both ends are rotatably connected to the ends of the connecting rods 302 through bearings. Guide grooves 303 are provided on both sides of the machine body 1. Guide plates 304 are slidably provided in the guide grooves 303. One end of the connecting rod 302 is hinged to the guide plate 304. A No. 3 cylinder 306 is fixedly installed on the machine body 1. The output end of the No. 3 cylinder 306 is fixedly connected to the guide plate 304. The film of the film roll 3 is located between the two pressure rollers 301. A swing motor 305 is fixedly installed on the guide plate 304. The output end of the swing motor 305 is fixedly connected to one end of the connecting rod 302. The pressure roller 301 is driven to move towards the film roll 3 by the cylinder 306. In order to avoid the film being damaged due to excessive tension during the movement of the pressure roller 301, the connecting rod 302 is hinged to the guide plate 304. The connecting rod is driven to swing by the swing motor 305 to give the film an adaptive tension. When the pressure roller 301 moves directly under the old film roll 3, the swing motor causes the swing amplitude of the film to tend to stabilize. Then the new film roll 3 moves upward and overlaps with the film at the bottom of the pressure roller 301.
[0031] See also Figure 1As shown, in order to bond the film interface on the new film roll 3 to the film on the old film roll 3, the glue applicator 2 includes a motion mechanism 21 and a dispensing head 22. Before the moving component 200 drives the new film roll 3 for replacement, the motion mechanism 21 drives the dispensing head 22 to apply glue to the film interface on the film roll 3. The glue outlet of the dispensing head 22 is set to be rotatable, so as to facilitate applying glue to the top and bottom film rolls 3 respectively. This application does not limit the specific structure of the glue applicator 2. The specific structure and working principle of the glue applicator 2 are all prior art and will not be described in detail here.
[0032] Example 2
[0033] The film tension adjustment on the unwinding machine involves the tension detection roller measuring the film tension in real time via the tension sensor 511 on its bearing housing, converting the physical tension into an electrical signal. These signals are sent to the tension regulator or PLC controller, compared with a preset tension value, and the error signal is calculated using a PID algorithm. Based on this, the output of the drive motor 207 is adjusted, for example, by changing its speed or torque, to dynamically compensate for tension fluctuations. When the unwinding machine changes film roll 3, the tension generated by the movement of the pressure roller 301 and the loosening caused by the movement of the old film roll 3 to the new film roll 3 will cause significant changes in the tension of the film during transportation. Compared to traditional tension adjustment, which only adjusts the speed of the drive motor 207 by coordinating the tension detection roller and the tension sensor to compensate for tension fluctuations, it is difficult to handle tension fluctuations caused by large tensioning or loosening of the film.
[0034] like Figures 6 to 7 As shown, an embodiment of the present invention provides a film tension adjustment device, including a tension adjustment mechanism 500, which adjusts the tension of the film on the unwinding assembly. The tension adjustment mechanism 500 is installed on the body 1 of the unwinding mechanism. The tension adjustment mechanism 500 includes an upper tension detection roller 501 and a lower tension detection roller 502. The upper tension detection roller 501 is located above the lower tension detection roller 502. The film is attached to the right side of the upper tension detection roller 501, passes between the upper tension detection roller 501 and the lower tension detection roller 502, is attached to the left side of the lower tension detection roller 502, and extends outward from the bottom of the lower tension detection roller 502. When the unwinding mechanism changes rolls, the upper tension detection roller 501 moves in the direction of film advance to maintain the film in a taut state. After the unwinding mechanism changes rolls, the upper tension detection roller 501 resets and adjusts the tension of the film through the lower tension detection roller 502 to keep the film in a constant tension state. As the old film roll 3 continues to move downwards, the film as a whole is in a loose state throughout the transportation process. At this time, it is difficult to quickly restore the tension of the film by adjusting the speed of the drive motor 207. As a result, when the rewinding machine rewinds the film roll 3, the film roll 3 will become loose. When the upper tension detection roller 501 detects a change in the surface tension of the film, it does not change the speed of the drive motor 207, but controls the tension detection roller itself to move in the direction of the film's forward movement, thereby quickly adjusting the tension of the film and compensating for the tension fluctuations of the film during transportation. Meanwhile, the old film roll 3 continues to move downwards, and the pressure roller 301 moves synchronously in the direction of the pressure roller 301. Since the speed and distance of the two are different, the tension of the film will fluctuate during the movement. Since the old film roll 3 and the new film roll 3 are replaced without interval, the rotation speed of the new film roll 3 remains unchanged. The old film roll 3 will change its rotation speed due to the fluctuation of the film tension. When the rotation speed of the old film roll 3 is faster than that of the new film roll 3, misalignment occurs when the two are bonded. As a result, the adhesive on the film interface of the new film roll 3 overflows to a position outside the bonding area during the misalignment, which leads to adhesion problems between the two layers of film during subsequent winding. When the rotation speed of the old film roll 3 is slower than that of the new film roll 3, after they are bonded together, the new film roll 3 rotates faster, which can cause the film of the old film roll 3 to loosen during transportation. This can lead to uneven winding density during subsequent winding. Therefore, it is necessary to ensure that the rotation speeds of the old and new film rolls 3 are the same during the replacement process. Thus, while the upper tension detection roller 501 quickly adjusts the film tension, a lower tension detection roller 502 is set up. The lower tension detection roller 502 detects the changes in film tension and swings up and down to adjust, in order to compensate for the fluctuations in film tension during transportation, thereby ensuring that the old film roll 3 can maintain a synchronous speed with the new film roll 3 during rotation.
[0035] See also Figures 6 to 7 As shown, in order to quickly adjust the tension changes caused by the film being stretched or loosened, and to give the film an adaptive tension during the adjustment process, the tension adjustment mechanism 500 also includes an elastic telescopic rod 503. A transverse groove 504 is provided on the machine body 1. Extension rods 505 are fixedly connected to both ends of the upper tension detection roller 501. The extension rods 505 are slidably disposed in the transverse groove 504 and one end extends to the outside of the machine body 1. One end of the elastic telescopic rod 503 is rotatably connected to the extension rod 505 through a bearing. A No. 4 cylinder 506 is fixedly installed on the machine body 1. The output end of the No. 4 cylinder 506 is fixedly connected to one end of the elastic telescopic rod 503. When the old film roll 3 moves toward the new film roll 3, it causes the film to loosen during transport. Since the film is attached to the upper tension detection roller 501 from the right side, in order to ensure rapid adjustment of the film tension, the fourth cylinder 506 drives the upper tension detection roller 501 to move to the right, thereby applying a tension to the film and quickly adjusting the tension change caused by the loosening of the film. When the pressure roller 301 moves toward the old film roll 3, it causes the film to be over-stretched during transport. In order to ensure the adjustment of the film tension, the fourth cylinder 506 drives the upper tension detection roller 501 to move to the left, thereby relieving the tension of the film and quickly adjusting the tension change caused by the film being stretched.
[0036] See also Figures 6 to 7 As shown, in order to ensure that the speed of the old film roll 3 remains constant during movement and to adjust for small-range tension changes in the film, the tension adjustment mechanism 500 also includes a swing motor 507. A vertical arc-shaped groove 508 is provided on the machine body 1. Extension rods 509 are fixedly connected to both ends of the lower tension detection roller 502. The extension rods 509 are slidably disposed in the arc-shaped groove 508 and one end extends to the outside of the machine body 1. One end of the extension rod 509 is rotatably connected to a sleeve rod 510 through a bearing. The swing motor 507 is fixedly installed on the machine body 1. The output end of the swing motor 507 is fixedly connected to one end of the sleeve rod 510, driving the lower tension detection roller 502 to swing up and down. In order to ensure that the rotation speed of the old and new film rolls 3 is the same when they are replaced, the rotation speed of the old film roll 3 cannot be adjusted to compensate for tension fluctuations. Therefore, the swing motor 507 drives the lower tension detection roller 502 to swing back and forth at a small angle to compensate for the tension fluctuations of the film and precisely adjust the tension changes of the film.
[0037] See also Figures 6 to 7As shown, the tension adjustment mechanism 500 also includes a tension sensor 511, which is mounted on the extension rod 509 and the extension rod 505 respectively. The tension sensor 511 is connected to the upper tension detection roller 501 and the lower tension detection roller 502 via signal connection. The tension detection roller is usually a guide roller or idler roller. When the film passes through the roller, tension is applied to it. The tension sensor 511 is directly integrated or mounted on the support structure of the tension detection roller, i.e., the extension rod 509 and the extension rod 505. It indirectly reflects the material tension by measuring the force on the roller shaft or bearing. The material tension acts on the tension detection roller, and the tension sensor 511 converts the mechanical force into an electrical signal. The electrical signal output by the tension sensor 511 is amplified and converted by the electronic circuit and sent to the tension controller. The controller compares the set value with the actual value through a PID algorithm and dynamically adjusts the braking system such as the fourth cylinder 506 and the swing motor to maintain the tension stability of the film. This application does not limit the specific structure of the tension sensor 511 and the tension detection roller. The specific structure and working principle of the tension sensor 511 and the tension detection roller are existing technologies and will not be described in detail here. Example 3 The web guiding device on the unwinding machine monitors the movement of the web material by emitting visible light through a web guiding sensor, and sends the signal to the controller. After the controller detects a positional drift in the film roll, it controls the correction frame to swing and correct the roll position according to the pre-set instructions. Traditional correction devices only correct the film position during transportation. However, the positional deviation of the film during transportation is not only due to the deviation of the two sides of the film. When the film roll 3 is installed, if the axis of the film roll 3 does not coincide with the axis of the installation roller 100, the clamping mechanism on the unwinding machine will fix the film roll 3. This will cause excessive tension fluctuations during transportation, resulting in an imbalance of forces on the film. The existing film roll 3 installation is only performed by the sleeve between the installation roller 100 and the inner winding roller 31 of the film roll 3. When the installation roller 100 and the winding roller 31 coincide, very precise installation equipment is required to install them. Otherwise, it will be difficult to install them. When the diameter of the installation roller 100 is smaller than the inner diameter of the winding roller 31, excessive tension fluctuations will inevitably occur during the transportation of the film roll 3.
[0038] like Figures 8 to 12 As shown, an embodiment of the present invention provides a film correction device, including a correction mechanism 600, which adjusts the position of the film on the unwinding mechanism. The correction mechanism 600 is installed on the mounting roller 100 of the unwinding mechanism and the machine body 1. The correction mechanism 600 includes a movable ring plate 601 and a fixed ring plate 602. The fixed ring plate 602 is fixedly installed on the mounting roller 100 and close to the sleeve 402 of the unwinding mechanism. The movable ring plate 601 is sleeved on the mounting roller 100 and located between the fixed ring plate 602 and the annular plate 401 of the unwinding mechanism. An expansion member 610 is installed on one side of both the movable ring plate 601 and the fixed ring plate 602. The expansion member 610 is sleeved on the mounting roller 100. After the winding roller 31 of the unwinding mechanism is installed on the mounting roller 100, the sleeve 402 moves forward, so that the sleeve 402 and the annular plate 401 simultaneously squeeze the two expansion members 610, so that the two expansion members 610 expand outward at the same time, and the two expansion members 610 fix the two ends of the winding roller 31. The correction mechanism 600 also includes an adjustment element 620, which adjusts the movement of the machine body 1, thereby adjusting the position of the film.
[0039] See also Figures 8 to 12 As shown, to ensure that the axis of the film roll 3 coincides with the axis of the mounting roller 100 during installation and to enable rapid installation of the film roll 3, the diameter of the movable ring plate 601 is larger than the diameter of the fixed ring plate 602. The diameter of the movable ring plate 601 is larger than the inner diameter of the roller 31 but smaller than the diameter of the ports 32 at both ends of the roller 31. The diameter of the fixed ring plate 602 is smaller than the inner diameter of the roller 31. The expansion member 610 includes a collar 611 and multiple pads 612. The collar 611 is fitted onto the mounting roller 100, and the multiple pads 612... 12 are located around the collar 611. A hinge rod 613 is installed between the collar 611 and the pad 612. The two ends of the hinge rod 613 are hinged to the collar 611 and the pad 612 respectively. Multiple slots are opened on both the movable ring plate 601 and the fixed ring plate 602. An extension plate 614 is fixedly connected to one side of the pad 612. The extension plate 614 passes through the slot and slides with the slot. Rollers 615 are installed at the four corners of the extension plate 614 through bearings. The rollers 615 are in contact with one side of the movable ring plate 601 and the fixed ring plate 602. When installing the film roll 3, since both ends of the roller 31 have ports 32, and the diameter of the ports 32 is larger than the diameter of the roller 31, the movable ring plate 601 enters the port 32 during installation because its diameter is larger than the inner diameter of the roller 31 and smaller than the diameter of the ports 32. Through the sliding connection between the movable ring plate 601 and the installation roller 100, the film roll 3 moves forward. Simultaneously, since the diameter of the fixed ring plate 602 is smaller than the inner diameter of the roller 31, the fixed ring plate 602 enters the roller 31. Inside, the fit between the two annular plates and the port 32 and inner diameter of the roller 31 facilitates the installation of the film roll 3. When the film roll 3 continues to move forward and the expansion member 610 on one side of the movable annular plate 601 contacts the annular plate 401 on the mounting roller 100, the film roll 3 stops moving forward and is driven downward by the moving assembly 200, so that the other end of the film roll 3 is located on the side of the sleeve 402. Then, the second cylinder 403 drives the sleeve 402 to move forward, so that the sleeve 402 and the annular plate 401 simultaneously engage the collar 61. 1. During compression, when the collar 611 moves forward, the hinge rod 613 is hinged to the pad 612 and the collar 611 at both ends, and one end of the pad 612 is slidably connected to the movable ring plate 601 and the fixed ring plate 602. This causes multiple pads 612 to move synchronously in all directions until they are in contact with the inner walls of the ports 32 at both ends of the roller 31, thus fixing the roller 31. Since the multiple hinge rods 613 are of the same length and the collar 611 is in contact with the outer surface of the mounting roller 100, the roller 31 is thus secured. The axis of roller 31 coincides with the axis of mounting roller 100. Since the two expansion members 610 are exactly the same, the film roll 3 is in a horizontal state, thus ensuring that the film roll 3 is transported in a horizontal state. The film roll 3 rotates around the mounting roller 100 as the axis, which solves the problem that the axis of the film roll 3 is difficult to coincide with the axis of the mounting roller 100 during installation. This would cause the clamping mechanism on the unwinding machine to fix the film roll 3, resulting in excessive tension fluctuations during transportation and causing the film to be unbalanced in force.
[0040] See also Figure 6As shown, for the purpose of adjusting the position of the film during transportation, the adjusting component 620 includes a correction sensor 621. The correction sensors 621 are located on both sides inside the machine body 1. The film passes through the correction sensor 621. An air-bearing guide rail 622 is installed at the bottom of the machine body 1. The air-bearing guide rail 622 is connected to the correction sensor 621 by signal. The correction sensor emits visible light to monitor the movement of the film and sends the signal to the controller. After the controller detects that the film has a positional drift, it controls the correction frame to swing through the air-bearing guide rail 622 to correct the position of the roll material according to the instructions preset by the controller. This application does not limit the specific structure of the correction sensor 621 and the air-bearing guide rail 622. The specific structure and working principle of the correction sensor 621 and the air-bearing guide rail 622 are all existing technologies and will not be described in detail here.
[0041] Example 4
[0042] A film tension adjustment device consists of an unwinding mechanism and a tension adjustment mechanism 500.
[0043] Example 5
[0044] A film correction device consists of an unwinding mechanism and a correction mechanism 600.
[0045] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.
Claims
1. A film tension adjustment device, characterized by, The tension adjusting mechanism is installed on the machine body of the unwinding mechanism and adjusts the tension of the film on the unwinding mechanism; The tension adjusting mechanism includes an upper tension detection roller and a lower tension detection roller, the upper tension detection roller is located above the lower tension detection roller, the film is attached to the right side of the upper tension detection roller, passes between the upper tension detection roller and the lower tension detection roller, is attached to the left side of the lower tension detection roller, and extends outward from the bottom of the lower tension detection roller, when the unwinding mechanism changes the roll, the upper tension detection roller moves to the advancing direction of the film, maintains the film in a tension state, after the unwinding mechanism completes the roll change, the upper tension detection roller resets, and the tension of the film is adjusted by the lower tension detection roller, so that the film is in a constant tension state.
2. A film tension regulating device according to claim 1, wherein The tension adjusting mechanism further includes an elastic telescopic rod, a transverse slot is formed in the machine body, the two ends of the upper tension detection roller are fixedly connected with extension rods, the extension rods are slidingly arranged in the transverse slot and extend to the outside of the machine body at one end, one end of the elastic telescopic rod is rotatably connected with the extension rod through a bearing, and a No. 3 air cylinder is fixedly installed on the machine body, and the output end of the No. 3 air cylinder is fixedly connected with one end of the elastic telescopic rod.
3. A film tension regulating device as claimed in claim 1, wherein The tension adjusting mechanism further includes a swing motor, a vertical arc-shaped slot is formed in the machine body, the two ends of the lower tension detection roller are fixedly connected with extension rods, the extension rods are slidingly arranged in the arc-shaped slot and extend to the outside of the machine body at one end, a sleeve rod is rotatably connected with one end of the extension rod through a bearing, the swing motor is fixedly installed on the machine body, and the output end of the swing motor is fixedly connected with one end of the sleeve rod to drive the lower tension detection roller to swing up and down.
4. The film tension regulating device of claim 1, wherein The tension adjusting mechanism further includes tension sensors, the tension sensors are installed on the extension rods and the extension rods respectively, and the tension sensors are signal connected between the upper tension detection roller and the lower tension detection roller.
5. A film tension regulating device according to any one of claims 1 to 4, wherein The unwinding mechanism further includes a machine body and a gluing machine, the machine body includes installation rollers, moving assemblies and pushing assemblies; The installation rollers are used for installing film rolls; Two groups of the moving assemblies are arranged above and below the machine body respectively, the installation rollers are installed on the moving assemblies, when the film roll on the upper installation roller is about to be exhausted, the moving assemblies drive the upper installation roller to move downward, simultaneously drive the film roll on the lower installation roller to move upward, and after gluing by the gluing machine, the film of the film roll on the lower installation roller is adhered to the film of the film roll on the upper installation roller; Two groups of the pushing assemblies are arranged above and below the machine body respectively, the pushing assemblies include pressure rollers, when the film roll on the upper installation roller is about to be exhausted, the pressure rollers move to the direction of the upper installation roller and move to the position directly below the upper installation roller, and drive the film of the film roll on the upper installation roller to move to the surface of the film on the lower installation roller.
6. The film tension regulating device of claim 1, wherein The mobile assembly comprises a threaded rod, two upper and lower symmetrical fixed long plates are fixedly installed on one side of the fuselage, guide rail grooves are formed in the fixed long plates, a mobile seat is slidably arranged in the guide rail grooves, sliding grooves are formed in the two sides of the fixed long plates, the threaded rod is rotatably arranged in the sliding grooves through bearings, the mobile seat is slidably arranged in the sliding grooves and is threadedly connected with the threaded rod, a servo motor is fixedly installed on the fixed long plate, the output end of the servo motor is fixedly connected with one end of the threaded rod, a driving motor is fixedly installed on one side of the mobile seat, the mounting roller is rotatably installed on the mobile seat through a bearing, and the output end of the driving motor is fixedly connected with one end of the mounting roller. The mobile assembly further comprises a movable seat, two upper and lower symmetrical fixed short plates are fixedly installed on the other side of the fuselage, guide grooves are formed in the fixed short plates, the movable seat is slidably arranged in the guide grooves, and a first air cylinder is fixedly installed on the top of the fixed short plate.
7. The film tension regulating device of claim 1, wherein The movable seat and the movable seat are provided with a positioning assembly for positioning the mounting roller, the positioning assembly comprises an annular plate and a sleeve, the annular plate is fixedly installed on the outer periphery of the mounting roller, a circular hole is formed in one side of the movable seat, the sleeve is slidably arranged in the circular hole, a second air cylinder is fixedly connected with one side of the movable seat, and the output end of the second air cylinder is fixedly connected with one end of the sleeve.
8. The film tension regulating device of claim 1, wherein The pushing assembly further comprises a connecting rod, the compression roller is arranged between the two connecting rods and is rotatably connected with the end portions of the connecting rods through bearings, guide grooves are formed in the two sides of the fuselage, guide plates are slidably arranged in the guide grooves, one end of the connecting rod is hingedly connected with the guide plate, a third air cylinder is fixedly installed on the fuselage, and the output end of the third air cylinder is fixedly connected with the guide plate. The guide plate is fixedly installed with a swing motor, and the output end of the swing motor is fixedly connected with one end of the connecting rod.
9. The film tension regulating device of claim 1, wherein The glue applying machine comprises a moving mechanism and a glue dispensing head, before the new film roll is replaced by the mobile assembly, the moving mechanism drives the glue dispensing head to apply glue to the port of the film on the film roll.
10. A method for adjusting a thin film tension adjusting device, characterized in that: The application of the film tension adjusting device according to claims 1 and 5 comprises the following specific steps: When the film roll is replaced by the unwinding mechanism, the mobile assembly drives the film roll on the upper mounting roller to move downward, at this time, the film in the fuselage is in a relaxed state, the compression roller in the pushing assembly moves toward the film roll, so that the film between the film roll and the compression roller is in a tensioned state, and the film between the compression roller and the upper tension detection roller and the film after the upper tension detection roller is in a tensioned state; The application of the film tension adjusting device according to claims 1 and 5 comprises the following specific steps: After the film is replaced by the unwinding mechanism, as the film on the film roll installed on the roller is continuously consumed, the distance between the port conveying the film on the film roll and the compression roller is continuously increased, the pulling force of the film is enhanced, the upper tension detection roller moves backward, the tension of the film is adjusted, at the same time, the output of the servo motor is adjusted through the lower tension detection roller to compensate the tension fluctuation of the film, and at the same time, the lower tension detection roller swings up and down with a small amplitude to give the film an adaptive tension.