A rewinding device

Abstract

The present application relates to a winding device, belonging to the field of film winding. A winding device includes a winding shaft for winding a film; a tracking roller parallel to the winding shaft and rotatably connected to a support frame at both ends of the tracking roller; a driving mechanism for driving the tracking roller away from or close to the winding shaft; wherein, the driving mechanism includes a driving member, a gear arranged on the output shaft of the driving member, and a rack arranged on the support frame and meshing with the gear. The present application has the effect that during the winding process, the wrap angle of the film on the winding shaft and the length of the suspended film between the tracking roller and the winding shaft change less, so that the tension during the winding of the winding shaft can be accurately controlled, ensuring the winding quality.

Description

Technical Field

[0001] This application relates to the field of film winding, and in particular to a winding device. Background Art

[0002] Winding devices are divided into film slitting machines, vacuum aluminizing machines, magnetron sputtering coating machines, etc. according to different fields. During the winding process, the diameter of the film on the winding shaft will continuously increase, resulting in changes in the wrap angle of the film on the winding shaft and the length of the suspended film. The changes in the wrap angle and the length of the suspended film cause changes in the tension during the winding of the winding shaft, thereby affecting the winding quality.

[0003] During the winding process of the devices in the related art, in order to ensure the winding quality, generally, a swingable tracking roller is added to make the distance change between the last driven roller and the winding shaft very small. However, the wrap angle of the film on the winding shaft and the length of the suspended film between the tracking roller and the winding shaft still change greatly, and the wrap angle and the length of the suspended film of the film on the winding shaft are related to the tension of the film on the winding shaft, ultimately affecting the winding quality.

[0004] Regarding the above technology, the inventor believes that there are defects in that during the winding process, the wrap angle of the film on the winding shaft and the length of the suspended film between the tracking roller and the winding shaft change greatly, resulting in low precision of the tension control of the winding shaft and affecting the winding quality. Summary of the Invention

[0005] In order to make the wrap angle of the film on the winding shaft and the length of the suspended film between the tracking roller and the winding shaft change less during the winding process, so as to accurately control the tension during the winding of the winding shaft and ensure the winding quality, this application provides a winding device.

[0006] The winding device provided by this application adopts the following technical solution:

[0007] A winding device includes:

[0008] A winding shaft for winding the film;

[0009] A tracking roller, parallel to the winding shaft and the two ends of the tracking roller are rotatably connected to a support frame;

[0010] A driving mechanism for driving the tracking roller away from or close to the winding shaft;

[0011] Wherein, the driving mechanism includes a driving member, a gear arranged on the output shaft of the driving member, and a rack arranged on the support frame and meshing with the gear.

[0012] By adopting the above technical solution, as the film wound on the take-up reel gradually thickens, the distance between the film and the tracking roller becomes smaller. The driving member in the driving mechanism drives the gear to rotate, the gear drives the rack to move, and the rack drives the support frame and the tracking roller on the support frame to move away from the take-up reel, thereby adjusting the wrap angle of the film on the take-up reel and making the suspended film length between the tracking roller and the take-up reel change less. The tension of the film on the take-up reel is precisely controlled, ensuring the winding quality.

[0013] Preferably, the support frame includes two support arms, and both ends of the tracking roller are respectively rotatably connected to one of the support arms.

[0014] By adopting the above technical solution, both ends of the tracking roller are respectively fixed on one support arm, and the support arm can effectively support the tracking roller.

[0015] Preferably, the rack is arc-shaped and disposed on an outer side surface of one of the support arms;

[0016] A fixed-axis rotating roller parallel to the tracking roller is further provided in the length direction of the support arm, and a first synchronous belt is wound around both the tracking roller and the fixed-axis rotating roller.

[0017] By adopting the above technical solution, the rack is set to be arc-shaped, and the rack drives the tracking roller to rotate around the axis of the fixed-axis rotating roller. Since both the tracking roller and the fixed-axis rotating roller are in contact with the film and should have the same linear velocity to facilitate the conveying of the film, the setting of the first synchronous belt makes the linear velocities of the tracking roller and the fixed-axis rotating roller consistent, and the tension received by the film is relatively stable. In addition, because both the tracking roller and the fixed-axis rotating roller are driving rollers and will not generate resistance to the film compared with driven rollers, the speed and tension of the film will not decay.

[0018] Preferably, it further includes a front fixed idler roller, and a second synchronous belt is wound around both the fixed-axis rotating roller and the front fixed idler roller.

[0019] By adopting the above technical solution, before the film enters the tracking roller, it needs to pass through the front fixed idler roller first. The front fixed idler roller is a driving roller and is used for conveying the film. At the same time, the setting of the second synchronous belt makes the linear velocities of the film on the fixed-axis rotating roller and the front fixed idler roller consistent, and the power is transmitted from the front fixed idler roller to the fixed-axis rotating roller, and then from the fixed-axis rotating roller to the tracking roller. Only by inputting the driving force on the front fixed idler roller in the whole process can the front fixed idler roller, the fixed-axis rotating roller and the tracking roller run synchronously and become driving rollers.

[0020] Preferably, an adjusting mechanism is further provided in the length direction of the support arm, and the adjusting mechanism is located between the tracking roller and the fixed-axis rotating roller;

[0021] The adjusting mechanism includes an adjusting roller and an adjusting roller support shaft that are both parallel to the tracking roller, and a support plate is connected between the adjusting roller and the adjusting roller support shaft;

[0022] The adjusting mechanism further includes a driving unit for driving the adjusting roller support shaft to rotate. The adjusting roller is located between the adjusting roller support shaft and the tracking roller, and both ends of the adjusting roller support shaft are respectively rotatably connected to a support arm.

[0023] By adopting the above technical solution, the driving unit drives the adjusting roller support shaft to rotate, and the adjusting roller rotates back and forth with the adjusting roller support shaft as the axis under the drive of the support plate. The driving unit has the functions of self-locking and braking, and can fix the adjusting roller at a certain position according to the displacement input by the PLC. Therefore, according to different materials of the film, the adjusting mechanism can adjust the wrap angle of the film on the tracking roller and the length of the film between the adjusting roller and the fixed-axis rotating roller.

[0024] Preferably, an arc-shaped groove is formed on one side surface of the support arm, and one end of the adjusting roller is located in the arc-shaped groove.

[0025] By adopting the above technical solution, the shaft head of the adjusting roller is located in the arc-shaped groove, and the arc-shaped groove limits the rotation angle of the adjusting roller within the radian range of the arc-shaped groove.

[0026] Preferably, a third synchronous belt is wound around both the adjusting roller and the adjusting roller support shaft.

[0027] By adopting the above technical solution, the third synchronous belt can drive the adjusting roller and the adjusting roller support shaft to rotate synchronously.

[0028] Preferably, the driving mechanism further includes a reducer connected to the output shaft of the driving member, and the output shaft of the reducer is fixedly connected to the gear.

[0029] By adopting the above technical solution, the reducer decelerates the power output by the driving member.

[0030] Preferably, a photoelectric sensor for detecting the position of the film on the take-up reel is provided on the support frame.

[0031] By adopting the above technical solution, when the film wound on the take-up reel gradually thickens until the film blocks the emitter of the photoelectric sensor, the receiver of the photoelectric sensor cannot receive the optical signal emitted by the emitter. The photoelectric sensor sends an electrical signal to the PLC, and the PLC controls the driving member to rotate. The PLC stores a preset distance according to different materials of the film, and the driving mechanism drives the tracking roller to move a preset distance away from the take-up reel.

[0032] In summary, the present application includes at least one of the following beneficial technical effects:

[0033] 1. By adopting the above technical solution, as the film wound on the take-up reel gradually thickens, the distance between the film and the tracking roller becomes smaller. The driving member in the driving mechanism drives the gear to rotate, the gear drives the rack to move, and the rack drives the support frame and the tracking roller on the support frame to move away from the take-up reel, thereby adjusting the wrap angle of the film on the take-up reel and making the suspended film length between the tracking roller and the take-up reel change less. The tension of the film on the take-up reel is precisely controlled, ensuring the winding quality;

[0034] 2. By adopting the above technical solution, the driving unit drives the adjusting roller support shaft to rotate, and the adjusting roller rotates back and forth with the adjusting roller support shaft as the axis under the drive of the support plate. The driving unit has the functions of self-locking and braking, and can fix the adjusting roller at a certain position according to the displacement input by the PLC. Therefore, according to different materials of the film, the adjusting mechanism can adjust the wrap angle of the film on the tracking roller and the length of the film between the adjusting roller and the fixed-axis rotating roller. Brief Description of the Drawings

[0035] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the winding device of the present application from one perspective;

[0036] Figure 2 It is a schematic diagram of the three-dimensional structure of the first embodiment of the winding device of the present application from another perspective;

[0037] Figure 3 It is a schematic diagram of the overall structure of the second embodiment of the winding device of the present application from one perspective;

[0038] Figure 4 It is a schematic diagram of the three-dimensional structure of the second embodiment of the winding device of the present application from another perspective;

[0039] Figure 5 It is a schematic diagram of the three-dimensional structure of the second embodiment of the winding device of the present application from yet another perspective;

[0040] Figure 6 It is a schematic diagram of the structure of the second embodiment of the winding device of the present application showing the moving state of the tracking roller;

[0041] Figure 7 It is a schematic diagram of the state of the tracking roller avoiding the film in the second embodiment of the winding device of the present application.

[0042] Description of reference numerals: 1. Film; 2. First synchronous belt; 3. Second synchronous belt; 4. Third synchronous belt; 10. Rewinding shaft; 20. Tracking roller; 30. Driving mechanism; 31. Driving member; 32. Gear; 33. Rack; 34. Reducer; 35. Transmission assembly; 351. First pulley; 352. Second pulley; 353. Fourth synchronous belt; 40. Support frame; 41. Support arm; 411. Arc-shaped groove; 412. First tensioning pulley; 413. Second tensioning pulley; 414. Third tensioning pulley; 415. Fourth tensioning pulley; 42. Guide rail; 43. Slide block; 44. Support rod; 50. Photoelectric sensor; 60. Fixed idler roller; 70. Fixed-axis rotating roller; 71. First pulley; 80. Adjusting mechanism; 81. Adjusting idler roller; 82. Adjusting idler roller support shaft; 821. Second pulley; 83. Support plate. Detailed implementation manners

[0043] The following further describes this application in detail with reference to the Figure 1-7 accompanying drawings.

[0044] Embodiment 1:

[0045] After thin films such as lithium battery positive and negative plates, separator films, and PET films are coated, roll-pressed, coated with a film, or slit, they need to be wound around a rewinding shaft by a winding device. An embodiment of this application discloses a winding device. Refer to Figure 1 and Figure 2 , a winding device includes a rewinding shaft 10, a tracking roller 20 parallel to the rewinding shaft 10, and a driving mechanism 30 for driving the tracking roller 20 to move away from or close to the rewinding shaft 10.

[0046] One end of the film 1 is wound around the rewinding shaft 10 to realize the winding of the film 1. The tracking roller 20 is tensioned and pressed against one surface of the film 1, and both ends of the tracking roller 20 are rotatably connected to a support frame 40.

[0047] The support frame 40 includes two mutually parallel support arms 41 and two mutually parallel guide rails 42. Both ends of the tracking roller 20 are respectively rotatably connected to one of the support arms 41. The surfaces of the two support arms 41 facing away from the tracking roller 20 are respectively fixedly connected with slide blocks 43, and each slide block 43 slides on the slideway of the guide rail 42.

[0048] The driving mechanism 30 includes a driving member 31, a gear 32 arranged on the output shaft of the driving member 31, and a rack 33 arranged on the support arm 41 and meshing with the gear 32.

[0049] The driving mechanism 30 further includes a reducer 34 connected to the output shaft of the driving member 31. The output shaft of the reducer 34 is fixedly connected with the gear 32, and speed reduction processing is performed through the reducer 34.

[0050] Among them, the driving member 31 can be a servo motor or a stepping motor.

[0051] The rack 33 is one or two. When there are two racks 33, one rack 33 is respectively fixed on each support arm 41. At the same time, there are also two gears 32, and each gear 32 drives one rack 33 to move back and forth, and the rack 33 drives the support arm 41 and the tracking roller 20 to move back and forth.

[0052] An optoelectronic sensor 50 is further provided on the support arm 41, and the transmitter and the receiver of the optoelectronic sensor 50 are respectively arranged on different support arms 41. Both the transmitter and the receiver of the optoelectronic sensor 50 are located between the winding shaft 10 and the tracking roller 20.

[0053] When the film 1 wound on the winding shaft 10 gradually thickens until the film 1 blocks the transmitter, the receiver cannot receive the optical signal emitted by the transmitter. The optoelectronic sensor 50 sends an electrical signal to the PLC. The PLC controls the driving member 31 to rotate. The PLC stores a preset distance according to the film 1 of different materials. The driving member 31 drives the gear 32 to rotate, and the gear 32 drives the rack 33 and the tracking roller 20 to move a preset distance in the direction away from the winding shaft 10. For example, when the thickness of the film 1 is 0.1 mm, the preset distance of each movement of the tracking roller 20 can be set to 0.5 mm.

[0054] The winding device further includes a front fixed idler roller 60. Before the film 1 enters the tracking roller 20, it first passes through the front fixed idler roller 60. The front fixed idler roller 60 is a driving roller and is used for conveying the film 1.

[0055] The working principle of a winding device in the first embodiment is as follows:

[0056] The film 1 that has been coated, roll-pressed, coated with a film or slit is pressed and tensioned by the front fixed idler roller 60. Under the drive of the front fixed idler roller 60, the film 1 is conveyed to the tracking roller 20 and is pressed and tensioned by the tracking roller 20. The tracking roller 20 is a driven roller, and the film 1 passing through the tracking roller 20 is wound on the winding shaft 10.

[0057] As the film 1 wound on the winding shaft 10 becomes thicker and thicker, the diameter of the film 1 gradually increases until the film 1 blocks between the transmitter and the receiver of the optoelectronic sensor 50. The optoelectronic sensor 50 sends an electrical signal to the PLC. After receiving the electrical signal sent by the optoelectronic sensor 50, the PLC controls the driving member 31 to rotate. The driving member 31 drives the gear 32 to rotate, and the gear 32 drives the rack 33 to move a preset distance in the direction away from the winding shaft 10. At the same time, the tracking roller 20 retreats a preset distance in the direction away from the winding shaft 10.

[0058] Among them, the tracking roller 20 moves intermittently. For example, when the film 1 wound on the winding shaft 10 increases by 10 turns, the tracking roller 20 moves a distance of 10 times the thickness of the film 1. Therefore, the distance change between the tracking roller 20 and the winding shaft 10 is very small, the length change of the suspended film between the winding shaft 10 and the tracking roller 20 is very small, and the wrap angle change of the film 1 on the winding shaft 10 is also very small. The winding tension is accurately controlled, and the winding quality of the film 1 is guaranteed.

[0059] Embodiment 2:

[0060] Please refer to Figure 3 and Figure 4 , a winding device includes a winding shaft 10, a tracking roller 20 parallel to the winding shaft 10, and a driving mechanism 30 for driving the tracking roller 20 to move away from or close to the winding shaft 10.

[0061] Please refer to Figure 3 and Figure 5 , one end of the film 1 is wound on the winding shaft 10 to realize the winding of the film 1. The tracking roller 20 is tensioned and pressed on one surface of the film 1, and both ends of the tracking roller 20 are rotatably connected to a support frame 40. The support frame 40 includes two support arms 41.

[0062] Please refer to Figure 3 and Figure 4 , the driving mechanism 30 includes a driving member 31, a gear 32 arranged on the output shaft of the driving member 31, and a rack 33 arranged on an outer side surface of the support arm 41 and meshing with the gear 32. The rack 33 is arc-shaped, and both ends of the tracking roller 20 are respectively rotatably connected to one of the support arms 41. Among them, the driving member 31 can be a servo motor or a stepping motor.

[0063] Please refer to Figure 3 and Figure 5 , the support frame 40 further includes a support rod 44 transversely arranged between the two support arms 41 for connecting and supporting. The support rod 44 is preferably two and is sequentially arranged along the length direction of the support arm 41.

[0064] A fixed-axis rotating roller 70 parallel to the tracking roller 20 is also arranged in the length direction of the support arm 41. A first synchronous belt 2 is wound around both the tracking roller 20 and the fixed-axis rotating roller 70 through belt pulleys. Both the tracking roller 20 and the fixed-axis rotating roller 70 are driving rollers, and the tension fluctuation of the film 1 is smaller compared with that of a driven roller.

[0065] In addition, since both the tracking roller 20 and the fixed-axis rotating roller 70 are in contact with the film 1 and should have the same linear velocity to facilitate the conveying of the film 1, the setting of the first synchronous belt 2 makes the linear velocities of the tracking roller 20 and the fixed-axis rotating roller 70 consistent.

[0066] Please refer to Figure 3 andFigure 4 The center of the rack 33 is the connection point between one end of the fixed-axis rotating roller 70 and the support arm 41. The reduction ratio of the gear 32 to the rack 33 is 8:1. Therefore, although the rack 33 is arc-shaped, it approaches a straight line relative to the gear 32.

[0067] The rewinding device further includes a front fixed idler roller 60. Before the film 1 enters the tracking roller 20, it first passes through the front fixed idler roller 60. The front fixed idler roller 60 is a driving roller and is used for conveying the film 1.

[0068] Both the fixed-axis rotating roller 70 and the front fixed idler roller 60 are wound with a second synchronous belt 3 through belt pulleys. The fixed-axis rotating roller 70 is fixedly sleeved with a first belt pulley 71. The first belt pulley 71 has two synchronously rotating wheels. One of the wheels is wound with a first synchronous belt 2, and the other wheel is wound with a second synchronous belt 3.

[0069] Among them, since the front fixed idler roller 60 is a driving roller, the second synchronous belt 3 makes the front fixed idler roller 60 and the fixed-axis rotating roller 70 rotate synchronously, and the first synchronous belt 2 makes the fixed-axis rotating roller 70 and the tracking roller 20 run synchronously. The fixed-axis rotating roller 70 and the tracking roller 20 become driving rollers. Compared with the situation where both of them are driven rollers, the fixed-axis rotating roller 70 and the tracking roller 20 will not cause obstacles during the transmission of the film 1, making the transmission of the film 1 have identity and making the tension fluctuation of the film 1 small.

[0070] Please refer to Figure 3 and Figure 5 , further, since different wrap angles need to be formed between the film 1 of different materials and the tracking roller 20, and the length of the film 1 between the tracking roller 20 and the fixed-axis rotating roller 70 needs to be different, an adjustment mechanism 80 is further provided in the length direction of the support arm 41. The adjustment mechanism 80 is located between the tracking roller 20 and the fixed-axis rotating roller 70. By providing the adjustment mechanism 80, the wrap angle of the film 1 on the tracking roller 20 can be adjusted according to the material of the film 1 before the film 1 is conveyed.

[0071] Please refer to Figure 4 and Figure 5 , the adjustment mechanism 80 includes an adjustment idler roller 81 and an adjustment idler roller support shaft 82 that are both parallel to the tracking roller 20. A support plate 83 is connected between the adjustment idler roller 81 and the adjustment idler roller support shaft 82. Among them, there are two support plates 83, and each support plate 83 is respectively connected between two opposite ends of the adjustment idler roller 81 and the adjustment idler roller support shaft 82.

[0072] The adjustment mechanism 80 further includes a driving unit for driving the adjustment idler roller support shaft 82 to rotate. The adjustment idler roller 81 is located between the adjustment idler roller support shaft 82 and the tracking roller 20. Both ends of the adjustment idler roller support shaft 82 are respectively rotatably connected to a support arm 41. Among them, the driving unit is any one of a motor, an electric cylinder or a cylinder.

[0073] Furthermore, an arc-shaped groove 411 is formed on one side surface of the support arm 41. The shaft head of the adjusting roller 81 is located within the arc-shaped groove 411, and the arc-shaped groove 411 limits the rotation angle of the adjusting roller 81 within the radian range of the arc-shaped groove 411.

[0074] In addition, in order to achieve closed-loop feedback, a proximity switch can be provided on the support arm 41. When the adjusting roller 81 rotates in place under the drive of the drive unit, the proximity switch sends a feedback signal to the PLC to notify it that the adjusting roller 81 has rotated in place.

[0075] Both the adjusting roller 81 and the adjusting roller support shaft 82 are wound with a third synchronous belt 4 through belt pulleys. A second pulley 821 is sleeved on the adjusting roller support shaft 82. The second pulley 821 has two wheels that can rotate synchronously. One wheel is wound with a first synchronous belt 2, and the other wheel is wound with a third synchronous belt 4. The first synchronous belt 2 drives the second pulley 821 to rotate, and the second pulley 821 drives the adjusting roller 81 and the adjusting roller support shaft 82 to operate synchronously through the third synchronous belt 4.

[0076] Please refer to Figure 3 and Figure 4 , the front fixed roller 60, the fixed-axis rotating roller 70, and the tracking roller 20 are all pressed against the same side of the film 1, and the adjusting roller 81 is pressed against the other side of the film 1.

[0077] Because during the transmission of the film 1, the driven roller has a certain resistance to the film 1. The front fixed roller 60, the fixed-axis rotating roller 70, the adjusting roller 81, and the tracking roller 20 in this embodiment are all driving rollers, and can operate at the same speed under the action of each synchronous belt. Setting them as driving rollers results in less tension fluctuation during the conveying of the film 1 compared to driven rollers. Therefore, the winding device of this embodiment is applicable to ultra-thin PET films with a thickness of less than 5 microns or similar ultra-thin films.

[0078] Furthermore, a first tensioning wheel 412 for tensioning the first synchronous belt 2 is provided on the support arm 41 between the fixed-axis rotating roller 70 and the adjusting roller support shaft 82. A second tensioning wheel 413 for tensioning the first synchronous belt 2 is provided on the support arm 41 between the adjusting roller support shaft 82 and the adjusting roller 81. A third tensioning wheel 414 and a fourth tensioning wheel 415 for tensioning the first synchronous belt 2 are provided on the support arm 41 between the adjusting roller 81 and the tracking roller 20. The third tensioning wheel 414 and the fourth tensioning wheel 415 are arranged in sequence along the width direction of the support arm 41.

[0079] The drive mechanism 30 further includes a reducer 34 connected to the output shaft of the drive member 31. The output shaft of the reducer 34 is fixedly connected to the gear 32, and speed reduction processing is performed through the reducer 34.

[0080] In order to save the space of the entire support frame 40 in the length direction of the tracking roller 20, the drive mechanism 30 further includes a transmission assembly 35. The transmission assembly 35 includes a first pulley 351 disposed on the output shaft of the speed reducer 34 and a second pulley 352 fixedly connected to the input shaft where the gear 32 is fixed. The first pulley 351 and the second pulley 352 are arranged along the width direction of the support arm 41, and a fourth synchronous belt 353 is sleeved on the first pulley 351 and the second pulley 352.

[0081] Further, the first synchronous belt 2, the second synchronous belt 3, the third synchronous belt 4, and the fourth synchronous belt 353 are all toothed belts. There is no relative sliding between the belt and the pulley, the transmission ratio is constant and accurate, and the buffering and vibration absorption effects are better.

[0082] An optoelectronic sensor 50 is further provided on the support arm 41. The emitter and the receiver of the optoelectronic sensor 50 are respectively arranged on one support arm 41.

[0083] When the film 1 wound on the take-up reel 10 gradually thickens until the film 1 blocks the receiver, the receiver cannot receive the optical signal emitted by the emitter. The optoelectronic sensor 50 sends an electrical signal to the PLC, and the PLC controls the driving member 31 to move. Figure 3 Schematically shows the state where the optoelectronic sensor 50 is partially blocked by the film.

[0084] Specifically, a preset distance is stored in the PLC according to the film 1 of different materials. The driving member 31 drives the gear 32 to rotate, and the gear 32 drives the rack 33 to move a preset distance in a direction away from the take-up reel 10.

[0085] Please refer to Figure 4 and Figure 6 , when the thickness of the film 1 is 0.05 mm and the material is metal foil, according to the winding process, the distance between the outer diameter of the tracking roller 20 and the outer diameter of the film 1 on the take-up reel 10 is set to be 10 ± 0.2 mm.

[0086] Specifically, before winding, the photoelectric sensor 50 is pre-set on the tracking roller 20, and the distance between the outer diameter of the tracking roller 20 and the outer diameter of the film 1 on the winding shaft 10 is 9.8 mm. At the same time, the preset distance of each movement of the tracking roller 20 in the PLC is 0.4 mm. As the film 1 winds thicker and thicker on the winding shaft 10, the diameter of the film 1 gradually increases until the film 1 blocks the transmitter and the receiver of the photoelectric sensor 50. The driving mechanism 30 drives the tracking roller 20 to move backward by 0.4 mm. When the thickness of the film 1 on the winding shaft 10 continues to increase and the receiver of the photoelectric sensor 50 is blocked by the film 1 again, the driving mechanism 30 drives the tracking roller 20 to move backward by 0.4 mm again. In this way, during the winding process, the tracking roller 20 always moves intermittently as the diameter of the film 1 changes, thereby adjusting the wrap angle of the film 1 on the winding shaft 10 and making the suspended film length between the tracking roller 20 and the winding shaft 10 change less.

[0087] In this embodiment, the rack 33 is arc-shaped, and the arc-shaped rack 33 is driven by the gear 32 to move back and forth. The arc-shaped rack 33 drives the tracking roller 20 to rotate and move with the axis of the fixed-axis rotating roller shaft 70 as the axis.

[0088] Specifically, the distance between the center of the tracking roller 20 and the center of the fixed-axis rotating roller 70 is ab; the distance between the center of the winding shaft 10 and the center of the fixed-axis rotating roller shaft 70 is ac; the distance between the center of the tracking roller 20 and the center of the winding shaft 10 is bc; the sum of the radius of the winding shaft 10 and the thickness of the film 1 on it is the winding diameter r1; the radius of the tracking roller 20 is r2; w2 is the angle between the horizontal line L and the ac line, which is also the initial position of the tracking roller 20; w1 is the rotation angle corresponding to the movement of the tracking roller 20. The driving member 31 and the angular displacement sensor together achieve the closed-loop control of the rotation angle of the tracking roller 20, and the angular displacement sensor can be set on the fixed-axis rotating roller shaft 70. The closest distance between the outermost film 1 on the tracking roller 20 and the winding shaft 10 is s.

[0089] Among them, bc = r1 + r2 + s. Although r1 is a variable, it can be obtained in real time through laser detection.

[0090] From the following formula:

[0091]

[0092] It can be obtained that:

[0093]

[0094] Therefore, in this embodiment, by programming the above formula into the PLC program, the swing angle w1 can be accurately controlled in a closed loop, and the intermittent movement of the tracking roller 20 can be accurately controlled.

[0095] Further, please refer to Figure 7 at the same time. The adjusted roller 81 in this embodiment is any one of a flattening roller, a gravure roller, a wrinkle-removing roller, and a tension-adjusting roller, and can achieve functions such as lateral flattening, lateral contraction, longitudinal wrinkle removal, and winding tension adjustment for films 1 of different materials.

[0096] When the adjusted roller 81 is a flattening roller, the requirements for the flattening roller vary depending on the material, thickness, width, etc. of the film 1. For example, when the film 1 is a copper foil, a smaller wrap angle between the copper foil and the flattening roller is required to achieve the effect of flattening during winding; when the film 1 is a PET film or a PP film, a larger wrap angle between the film 1 and the flattening roller is required to achieve flattening during winding. As Figure 7 shown, when the film 1 is an aluminum foil material or a battery pole piece, if the flattening roller is on the running path of the film 1, it will cause the film 1 to wrinkle or even break, so the flattening roller needs to avoid the running path. Therefore, by setting the adjustment mechanism 80, the adjusted roller 81 can swing to achieve different functions.

[0097] Further, since different processes are used for different segments of some films 1, even the same film 1 will have different thicknesses at different segments. By setting the adjusted roller 81, different wrap angle adjustments can be made for different thickness parts of the same film 1.

[0098] Further, the swing angle of the adjusted roller 81 in the arc-shaped groove 411 is ±15°. When the driving unit is a motor, the corresponding motor speed is 0-26.7 revolutions, and a speed reducer with a reduction ratio of 1:320 can be additionally provided. The higher reduction ratio makes the swing angle accuracy of the adjusted roller 81 higher each time.

[0099] The working principle of a winding device in the second embodiment is as follows:

[0100] First, according to the film 1 of different materials, adjust the wrap angle of the film 1 on the tracking roller 20 and the length of the film 1 between the adjusted roller 81 and the fixed-axis rotating roller 70. Specifically, the driving unit drives the adjusted roller support shaft 82 to rotate, and the adjusted roller 81 rotates back and forth in the arc-shaped groove 411 driven by the support plate 83 with the adjusted roller support shaft 82 as the axis. The driving unit has the functions of self-locking and braking, and can fix the adjusted roller 81 at a certain position in the arc-shaped groove 411 according to the displacement input by the PLC.

[0101] Then, the film 1 after coating, rolling, coating or slitting is successively conveyed to the tracking roller 20 by the front fixed idler roller 60, the fixed-axis rotating roller 70, and the adjusting idler roller 81, and finally wound on the winding shaft 10. The synchronous operation of the fixed idler roller 60 and the fixed-axis rotating roller 70 is realized by the second synchronous belt 3, the synchronous operation of the fixed-axis rotating roller 70 and the tracking roller 20 is realized by the first synchronous belt 2, and the synchronous operation of the adjusting idler roller 81 and the adjusting idler roller support shaft 82 is realized by the third synchronous belt 4. The adjusting idler roller support shaft 82 is driven to rotate by the first synchronous belt 2. Therefore, the front fixed idler roller 60, the fixed-axis rotating roller 70, the adjusting idler roller 81, and the tracking roller 20 run at the same speed and are all driving rollers. Compared with the driven rollers, the tension fluctuation of the film 1 is small. Therefore, the winding equipment of this embodiment is applicable to ultra-thin PET films below 5 microns or similar ultra-thin films.

[0102] In addition, during the conveying process of the film 1, as the film 1 winds thicker and thicker on the winding shaft 10, the diameter of the film 1 gradually increases until the film 1 blocks between the emitter and the receiver of the photoelectric sensor 50. The photoelectric sensor 50 sends an electrical signal to the PLC. After receiving the electrical signal sent by the photoelectric sensor 50, the PLC controls the driving member 31 to rotate. The driving member 31 drives the rack 33 to move a preset distance away from the winding shaft 10. At the same time, the tracking roller 20 retreats a preset distance away from the winding shaft 10. Since the rack 31 is arc-shaped but tends to be straight, the translation of the tracking roller 20 is realized simultaneously in this embodiment.

[0103] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A winding device, characterized in that: it includes: a winding shaft (10) for winding a film (1); a tracking roller (20), parallel to the winding shaft (10) and both ends of the tracking roller (20) are rotatably connected to a support frame (40); a driving mechanism (30) for driving the tracking roller (20) to move away from or close to the winding shaft (10); wherein, the driving mechanism (30) includes a driving member (31), a gear (32) arranged on the output shaft of the driving member (31), and a rack (33) arranged on the support frame (40) and meshing with the gear (32); the support frame (40) includes two support arms (41), and both ends of the tracking roller (20) are respectively rotatably connected to one of the support arms (41); the rack (33) is arc-shaped and arranged on an outer side surface of one of the support arms (41); a fixed-axis rotating roller (70) parallel to the tracking roller (20) is further arranged in the length direction of the support arm (41), and a first synchronous belt (2) is wound around both the tracking roller (20) and the fixed-axis rotating roller (70); it further includes a front fixed idler roller (60), and a second synchronous belt (3) is wound around both the fixed-axis rotating roller (70) and the front fixed idler roller (60); an adjusting mechanism (80) is further arranged in the length direction of the support arm (41), and the adjusting mechanism (80) is located between the tracking roller (20) and the fixed-axis rotating roller (70); the adjusting mechanism (80) includes an adjusting idler roller (81) and an adjusting idler roller support shaft (82) both parallel to the tracking roller (20), and a support plate (83) is connected between the adjusting idler roller (81) and the adjusting idler roller support shaft (82); the adjusting mechanism (80) further includes a driving unit for driving the adjusting idler roller support shaft (82) to rotate, the adjusting idler roller (81) is located between the adjusting idler roller support shaft (82) and the tracking roller (20), and both ends of the adjusting idler roller support shaft (82) are respectively rotatably connected to a support arm (41); an arc-shaped groove (411) is formed on one side surface of the support arm (41), and one end of the adjusting idler roller (81) is located in the arc-shaped groove (411); the tracking roller (20), the fixed-axis rotating roller (70), the adjusting idler roller (81) and the front fixed idler roller (60) are all driving rollers; the driving mechanism (30) further includes a reducer (34) connected to the output shaft of the driving member (31), and the output shaft of the reducer (34) is fixedly connected to the gear (32); a photoelectric sensor (50) for detecting the position of the film (1) on the winding shaft (10) is arranged on the support frame (40).

2. The winding device according to claim 1, characterized in that: a third synchronous belt (4) is wound around both the adjusting idler roller (81) and the adjusting idler roller support shaft (82).

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