Roller device

Abstract

A supporting roller device comprises a plurality of supporting roller mechanisms corresponding one by one to the plurality of diaphragm material rolls wound on a winding shaft, the supporting roller mechanisms comprising a supporting roller seat, a swing arm rotatably connected to the supporting roller seat, a supporting roller arranged on the swing arm, and a first driving member for driving the supporting roller to press against the diaphragm material roll. The supporting rollers of the plurality of supporting roller mechanisms are respectively pressed against the plurality of diaphragm material rolls wound on the winding shaft, so that the pressure of each group of diaphragm material rolls is individually controlled, the winding uniformity is good, the tension is uniform, and the winding quality is greatly improved.

Description

Technical Field

[0001] The invention relates to a roller device and belongs to the technical field of automation equipment. Background Art

[0002] When making battery cells, a diaphragm is needed to separate the positive and negative electrodes to prevent electrodes of different polarities from contacting and causing a short circuit. Depending on the specifications of the battery cell, the diaphragm substrate needs to be cut to the required width as needed, and then the cut diaphragm strips are rolled into diaphragm rolls to facilitate the later preparation of the battery cell. Since the coating thickness of the diaphragm substrate is uneven, and at the same time, there are multiple groups of slit diaphragm strips on a reel for reeling. As the diaphragm roll becomes thicker, the thickness difference caused by the uneven thickness of the diaphragm substrate becomes larger and larger. When the reel retreats, it is possible that some diaphragm rolls are attached to the guide rollers, while some diaphragm rolls are not attached, affecting the winding quality. In order to solve the problem of thickness difference, a mechanism for reeling in multiple groups of reels separately has emerged. This mechanism uses independent reeling shafts to reel in the slit diaphragm strips of each group separately. However, if this mechanism structure is used for single-arm reeling, it is impossible to reel in diaphragms with larger widths; if double-arm reeling is used, there are problems such as poor concentricity and uneven reeling tension, which ultimately lead to poor reeling quality. Summary of the invention

[0003] The object of the present invention is to provide a roller device for improving the winding quality of diaphragm.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a supporting roller device, which includes multiple groups of supporting roller mechanisms corresponding one by one to the multiple groups of diaphragm material rolls wound on the winding shaft, and the supporting roller mechanism includes a supporting roller seat, a swing arm rotatably connected to the supporting roller seat, a supporting roller arranged on the swing arm, and a first driving member for driving the supporting roller to press against the diaphragm material roll.

[0005] As a further improved technical solution of the present invention, the supporting roller mechanism includes a pair of swing arms respectively connected to the axial ends of the supporting roller.

[0006] As a further improved technical solution of the present invention, the swing arm is provided with through holes in consistent positions for inserting a connecting piece, and a fixing piece for fixing the connecting piece is provided outside the through hole to achieve synchronization of the movement of a pair of the swing arms.

[0007] As a further improved technical solution of the present invention, the supporting roller mechanism also includes a driving component for driving the supporting roller to rotate.

[0008] As a further improved technical solution of the present invention, the driving assembly includes a second driving member, a transmission shaft and a transmission component. The second driving member is connected to and drives the transmission shaft to rotate. The transmission shaft synchronously drives multiple groups of the supporting rollers to rotate together through the transmission component.

[0009] As a further improved technical solution of the present invention, the support roller mechanism also includes a first positioning portion rotatably arranged on the swing arm, the end of the support roller connected to the swing arm forms a second positioning portion, and the first positioning portion is plugged into and matched with the second positioning portion to achieve the connection between the support roller and the swing arm.

[0010] As a further improved technical solution of the present invention, the first positioning portion is configured as a protrusion, the second positioning portion is configured as a recessed portion formed inwardly, and an intercepting portion flush with the axial end surface of the roller is configured at the tail of the first positioning portion away from the second positioning portion.

[0011] As a further improved technical solution of the present invention, conical transmission is adopted between the first positioning part and the second positioning part.

[0012] As a further improved technical solution of the present invention, the first positioning portion is embedded in the contact surface of the supporting roller and a plurality of grooves are formed thereon.

[0013] As a further improved technical solution of the present invention, it also includes a shifting mechanism, wherein the shifting mechanism includes a guide member, the guide member is parallel to the winding shaft, and the roller mechanism seat is slidably arranged on the guide member.

[0014] Compared with the prior art, the supporting roller device of the present invention includes multiple groups of supporting roller mechanisms corresponding to the multiple groups of diaphragm material rolls wound on the winding shaft, the supporting roller mechanisms include a supporting roller seat, a swing arm rotatably connected to the supporting roller seat, a supporting roller arranged on the swing arm, and a first driving member for driving the supporting roller to press against the diaphragm material roll. The first driving member drives the supporting roller to press toward the winding shaft, and continuously outputs force so that the supporting roller on the swing arm always presses the corresponding diaphragm material roll, so that each group of diaphragm material rolls has separate pressure control, prevents the diaphragm material rolls from loosening, and has a smoothing effect on the surface of the diaphragm material roll, with good winding uniformity and uniform tension, which greatly improves the winding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the roller device of the present invention.

[0016] Figure 2 It is a schematic diagram of the cooperation between the roller device and the winding mechanism of the present invention.

[0017] Figure 3 It is a structural schematic diagram of the roller mechanism of the roller device of the present invention.

[0018] Figure 4 yes Figure 3 Schematic diagram of the structure without the support roller.

[0019] Figure 5 It is a cross-sectional view of the supporting roller of the supporting roller mechanism of the present invention. DETAILED DESCRIPTION

[0020] Please refer to Figures 1 to 5 As shown, the present invention discloses a roller device 100, which is applied to a membrane slitting machine. The membrane substrate is slit into a plurality of membrane strips 202 of set width in the membrane slitting machine. The plurality of membrane strips 202 are rolled into a plurality of membrane rolls 203 on a reel 201 of a reeling mechanism 200. The roller device 100 is used to abut against the membrane roll 203. The words "connect", "install", "fix" and the like described below, unless otherwise specified, may be directly connected, installed, fixed, or indirectly connected, installed, fixed, that is, third-party material intervention is allowed.

[0021] The roller device 100 includes a plurality of roller mechanisms 10 spaced apart in a direction parallel to the winding shaft 201, and the roller mechanisms 10 correspond to the diaphragm material roll 203 one by one. The roller mechanism 10 includes a roller 11, a roller seat 12, a swing arm 13, and a first driving member 14. The roller 11 is rotatably arranged at one end of the swing arm 13, and the diaphragm strip 202 is wound by the winding shaft 201 after passing through the roller 11. The other end of the swing arm 13 is rotatably arranged on the roller seat 12, and can swing toward the winding shaft 201 relative to the roller seat 12. The first driving member 14 is a cylinder, which is arranged on the side of the roller seat 12 away from the winding shaft 201. The output end of the first driving member 14 is connected to the swing arm 13, which is used to drive the swing arm 13 to "press" the roller 11 to the winding shaft 201, and output a stable force during the winding process so that the roller 11 always "presses" the diaphragm material roll 203. In some embodiments, the output end of the first driving member 14 can also be connected to the supporting roller 11 to directly drive the supporting roller 11 to press against the winding shaft 201. When the winding shaft 201 is winding, as the diaphragm material roll 203 on the winding shaft 201 becomes thicker and thicker, the winding shaft 201 gradually retreats away from the supporting roller 11 to leave space for winding. Ideally, the distance that the winding shaft 201 retreats is consistent with the thickness of the wound diaphragm material roll 203. At this time, the swing arm 13 of the supporting roller mechanism 10 remains in place and does not swing, while the supporting roller 11 corresponding to the diaphragm material roll 203 always stays in place against the outer periphery of the diaphragm material roll 203, ensuring that the force output by the first driving member 14 is continuous, stable and accurate, thereby improving the winding quality of the diaphragm material roll 203.

[0022] Furthermore, in order to stabilize the installation of the supporting roller 11, swing arms 13 and supporting roller seats 12 are provided at both ends of the axial direction of the supporting roller 11, and the swing arms 13 correspond to the supporting roller seats 12 one by one, and the two swing arms 13 are spaced apart along the axial direction of the supporting roller 11; of course, in some embodiments, only one supporting roller seat 12 may be provided, and a pair of swing arms connected to the supporting roller 11 are rotatably spaced apart on the supporting roller seat 12. In summary, the use of double arms to install the supporting roller 11 can improve the overall stability of the supporting roller 11. Specifically, in order to improve the synchronization of the pair of swing arms 13 corresponding to each supporting roller 11, so that when the pair of swing arms 13 jointly control the supporting roller 11, the axial direction of the supporting roller 11 is always parallel to the winding shaft 201, and there will be no situation where one is in front and the other is behind, resulting in that part of the supporting roller 11 abuts against the diaphragm material roll 203, while part of it fails to abut against the diaphragm material roll 203, affecting the overall winding of the diaphragm material roll 203, each pair of swing arms 13 is provided with a through hole 131 with the same position, and a fixing member 132 is provided on the outer wall of one side or both sides of the through hole 131. In actual use, a connecting member (not shown) is inserted into the through hole 131, and the connecting member is fixed by the fixing member 132, so that the connecting member cannot move in the two through holes 131, so that when the swing arm 13 on one side of the supporting roller 1 swings, the swing arm 13 on the other side will be driven to swing accordingly through the linkage of the connecting member, effectively ensuring the synchronization of the swing of the pair of swing arms 13. The connecting member may be a connecting rod, a connecting block or a connecting plate, etc., and the fixing member 132 may be a clamp, a clamp or a plug rod that can be inserted into the connecting member, etc. Further, in the case of linkage with the connecting member, only one set of the two sets of swing arms 13 may be connected to the first driving member 14, and the first driving member 14 drives the connected swing arms 13, and the other set of swing arms 13 is linked by the connecting member, thereby synchronously driving the supporting roller 11 to press against the winding shaft 201; or the two sets of swing arms 13 may be connected to one set of the first driving member 14 respectively, so that the two sets of the first driving members 14 respectively drive the two sets of swing arms 13 to drive the supporting roller 11 to press against the winding shaft 201. When there is a large difference in thickness of the diaphragm roll 203, no connecting member is provided, and two sets of the first driving members 14 are used to drive the two sets of swing arms 13 respectively, so that the supporting roller 11 can better fit each part and improve the winding quality.

[0023] Please combine Figure 5As shown, in order to hold the supporting roller 11 tightly, a first positioning portion 15 is rotatably provided on the swing arm 13, and the end portion where the supporting roller 11 is connected to the swing arm 13 forms a second positioning portion 115 correspondingly. The first positioning portion 15 and the second positioning portion 115 are plugged together to achieve the connection between the supporting roller 11 and the swing arm 13. Among them, the first positioning portion 15 can be a convex portion, and the corresponding second positioning portion 115 is a concave portion; or the first positioning portion 14 can be a concave portion, and the second positioning portion 115 can be a convex portion; in some special cases, the first positioning portion 15 and the second positioning portion 115 can also be a plug-in mechanism formed by the cooperation of multiple convex portions and concave portions. In order to facilitate machining and plug-in cooperation, preferably, the first positioning portion 15 is a convex block rotatably provided on the swing arm 13, and the second positioning portion 115 is a concave portion formed by the inward depression of the end portion where the supporting roller 11 is connected to the swing arm 13. Specifically, a mounting shaft 154 is provided on the swing arm 13, and the first positioning portion 15 is rotatably connected to the mounting shaft 154 through a bearing 153. The first positioning portion 15 is embedded in the second positioning portion 115 to connect the support roller 11 and the swing arm 13. In this way, when the support roller 11 rotates, the first positioning portion 15 can also rotate, thereby realizing the rotation connection between the support roller 11 and the swing arm 13. More specifically, the mounting shaft 154 is a hollow shaft, and a bolt 155 can be driven into the mounting shaft 154 to fasten the first positioning portion 15 and the second positioning portion 115, thereby better connecting the support roller 11 and the swing arm 13.

[0024] Furthermore, in order to improve the concentricity of the two axial ends of the supporting roller 11 when the supporting roller 11 rotates, that is, to ensure that the speeds of the two ends are consistent, the first positioning part 15 needs to hug the two ends of the supporting roller 11. The first positioning part 15 has a transmission function. The closer the first positioning part 15 fits the supporting roller 11, the better the transmission effect is, and the more the synchronization of the two ends of the supporting roller 11 can be improved. However, when the first positioning part 15 is embedded in the roller 11, if the sizes of the two are just right, the first positioning part 15 is difficult to insert. If there is too much gap, the first positioning part 15 may idle during transmission and cannot stably link with the roller 11. Therefore, the end of the first positioning part 15 is set to a cone, and correspondingly, the second positioning part 115 of the roller 11 for accommodating the end of the first positioning part 15 is also set to a cone. On the one hand, the conical second positioning part 115 is similar to a bell mouth, and its outer diameter decreases from large to small from the outside to the inside, which has a certain guiding effect, facilitating the first positioning part 15 to be accurately inserted along the gradually decreasing second positioning part 115. On the other hand, through the cone surface transmission, the linkage effect of the first positioning part 15 and the roller 11 is better. At the same time, an intercepting part 152 flush with the axial end face of the roller 11 can also be set at the tail of the first positioning part 15 away from the second positioning part 115. Since the axial end face of the roller 11 is a plane, the side of the intercepting part 152 that fits the end face is also set to a plane. When the first positioning part 15 and the second positioning part 115 are conical transmission, due to the error of machining, the conical surfaces of the two may not be completely fitted. In this case, when the first positioning part 15 is inserted into the second positioning part 115, due to the error of the conical surface, the protrusion may be inserted crookedly, which eventually affects the stability of the rotation of the supporting roller 11. Therefore, an intercepting part 152 with a flat contact surface is provided at the tail of the first positioning part 15. On the one hand, the flat surface is easy to process and is not prone to errors. On the other hand, the flat surface can be used as a reference surface. When the intercepting part 152 is pressed against the axial end face of the supporting roller 11 in a fitted state, it can ensure that the first positioning part 15 is inserted correctly, reducing the installation error.

[0025] Furthermore, the first positioning portion 15 is embedded in the contact surface of the supporting roller 11 and has multiple groups of grooves 150. When the supporting roller 11 rotates, the grooves 150 can increase the transmission torque, so that the first positioning portion 15 is not easy to slip with the second positioning portion 115. In some embodiments, since one end of the supporting roller 11 actively rotates and the other end rotates with the transmission, it is sufficient to only set the first positioning portion 15 at the active end of the supporting roller 11 with the grooves 150.

[0026] It should be noted that, since the supporting roller 11 is always against the diaphragm material roll 203 during the winding process, if the supporting roller 11 is a driven roller, the roller surface is against the diaphragm material roll 203, and rotates along with the rotation of the diaphragm material roll 203. Due to the speed difference, resistance will be generated to the diaphragm strip 202 being wound, so that the winding speed of the diaphragm material roll 203 on the winding shaft 201 does not correspond to the winding speed of the diaphragm strip 202, and eventually the diaphragm strip 202 breaks or is not wound in time, affecting the winding effect. In summary, the supporting roller 11 is set as the active roller, and when the winding shaft 201 rotates and the diaphragm strip 202 is wound to form the diaphragm material roll 203, the supporting roller 11 rotates closely against the outer circumference of the diaphragm material roll 203 to assist in guiding the diaphragm strip 202 to be wound.

[0027] In order to drive the roller 11 to rotate, the roller device 100 of the present invention further includes a driving assembly 20, which is connected to and drives the roller 11 to rotate. In one embodiment, each roller mechanism 10 can be configured with a set of independent driving assemblies 20 to be driven separately. Specifically, the driving assembly 20 includes a motor, which is connected to the roller 11 to drive the roller 11 to rotate. Since multiple groups of diaphragm rolls 203 are wound on a winding shaft 201, the winding speed of each group of diaphragm rolls 203 is consistent. In order to reduce costs and improve the uniformity of winding, in another embodiment, a set of driving assemblies 20 can be used to synchronously drive multiple groups of roller mechanisms 10 to rotate.

[0028] Specifically, the driving assembly 20 includes a second driving member 21, a transmission shaft 22 and a transmission member 23. The second driving member 21 is a motor. The second driving member 21 is arranged on a base plate 50. The base plate 50 is a large plate on which each mechanism is installed. The second driving member 21 is connected to and drives the transmission shaft 22 to rotate. The transmission shaft 22 passes through the base plate 50 and is connected to the roller mechanism 10 mounted between the base plates 50. The transmission shaft 22 synchronously drives multiple groups of rollers 11 to rotate together through the transmission member 23. Among them, the second driving member 21 is preferably a motor, the transmission shaft 22 is preferably a spline shaft, and the transmission member 23 is preferably a synchronous belt assembly. Each group of rollers 11 is connected in series to the spline shaft through the synchronous belt assembly. The synchronous belt assembly includes a driving wheel 231 connected to the spline shaft, a driven wheel 232 connected to the supporting roller 11, and a synchronous belt 233 connecting the driving wheel 231 and the driven wheel 232. The second driving member 21 drives the spline shaft to drive the driving wheel 231 to rotate, and the synchronous belt 233 drives the driven wheel 232 to rotate, and finally drives the supporting roller 11 to rotate. In order to facilitate the disassembly and assembly of the supporting roller mechanism 10 relative to the driving assembly 20, the driving wheel 231 is arranged in the supporting roller seat 12, and the supporting roller seat 12 is also provided with a spline sleeve that can be connected to the spline shaft and drive the spline shaft, and the driving wheel 231 is connected to the spline sleeve. During installation, the spline shaft is inserted into the supporting roller seat 12 and connected to the spline sleeve. When the second driving member 21 drives the spline shaft to rotate, the spline shaft drives the spline sleeve, and the spline sleeve drives the driving wheel 231, thereby linking the supporting roller 11 to rotate. Since the driving wheel 231 is arranged in the roller seat 12, when adjusting the position or number of the roller mechanism 10, the roller mechanism 10 can be directly pushed, inserted or removed along the spline shaft. In some embodiments, in order to improve the synchronization of the rotation of the two ends of the axial direction of the roller 11, one end of the roller 11 is set to actively rotate, and the other end is driven by the roller itself to achieve follow-up rotation, so as to avoid the two ends being out of sync due to transmission errors when both ends actively rotate at the same time. At this time, only a driven wheel 232 is provided at one end of the roller 11, and the driven wheel 232 is arranged on the bearing 153 at this end. In this way, after the driven wheel 232 rotates, it drives the bearing 153 and the first positioning part 15 to rotate, and finally drives the roller 11 to rotate.

[0029] In actual use, the membrane slitting machine needs to cut membrane strips 202 of different widths according to the needs of the process. When the width of the membrane strips 202 changes, the number of membrane strips 202 that can be cut by the membrane substrate will change, and the number of membrane rolls 203 wound on the winding shaft 201 and the distance between adjacent membrane rolls 203 will also change. Therefore, it is necessary to adjust the number and position of the supporting roller mechanism 10 according to the number and position of the membrane rolls 203 to ensure that each membrane roll 203 has a corresponding supporting roller mechanism 10 to accurately abut. In this embodiment, since the supporting roller mechanism 10 is linked to the self-rotation of all supporting rollers 11 via a second driving member 21 and a transmission shaft 22, the transmission shaft 22 needs to be detachable when increasing or decreasing the number of supporting rollers 11. Specifically, one end of the transmission shaft 22 passes through the base plate 50 and is connected to the second driving member 21 through the coupling 52; at the same time, a clamp 54 is provided on the base plate 50 to lock one end of the transmission shaft 22. Specifically, the clamp 54 is rotatably arranged on the base plate 50, and the transmission shaft 22 passes through the clamp 54 and is linked with the coupling 52. When the driving roller 11 rotates, the clamp clamps the transmission shaft 22, which stabilizes the connection between the transmission shaft 22 and the coupling 52, and also stabilizes the relative position of the transmission shaft 22 and the base plate 50, thereby ensuring the stability of the transmission of the transmission shaft 22. When adjusting the roller mechanism 10, loosen the clamp 54, pull out the spline shaft from the coupling 52, and the connection between the roller mechanism 10 and the driving assembly 20 can be released, which is convenient for adjusting the roller mechanism 10.

[0030] When more supporting roller mechanisms 10 are sleeved on the transmission shaft 22, the vacant position of the other end of the transmission shaft 22 away from the second driving member 21 is smaller, that is, the suspended position of the other end is shorter, and when the transmission shaft 22 rotates, the other end will not idle too much and deviate from the axis; when the vacant distance of the other end of the transmission shaft 22 is longer, a tailstock 60 is added to support the other end of the transmission shaft 22; when necessary, the connection between the tailstock 60 and the transmission shaft 22 is released, and the transmission shaft 22 can be removed, or the supporting roller mechanism 10 can be sleeved on or removed from the transmission shaft 22.

[0031] Specifically, the tailstock 60 includes a base 61, a sleeve 62 and a hoop 63. The sleeve 62 is rotatably set on the base 61 through a bearing. The hoop 63 is set at one end of the sleeve 62 close to the transmission shaft 22. The transmission shaft 22 passes into the sleeve. The locking hoop 63 can clamp the transmission shaft 22, thereby fixing the other end of the transmission shaft 22, so that the transmission shaft 22 can rotate stably under the drive of the second driving member 21.

[0032] Specifically, in order to facilitate the adjustment of the position of the roller mechanism 10 and the increase or decrease of the number of the roller mechanism 10 so as to make it cooperate well with the membrane material roll 203, the roller device 100 further includes a shifting mechanism 30, which includes a guide member 31 parallel to the winding shaft 201 and arranged between the base plates 50, and the roller seat 12 is slidably connected to the guide member 31, so that the roller seat 12 is movable on the guide member 31, and the roller seat 12 can be pushed on the guide member 31 to adjust the position of the roller mechanism 10, or the roller seat 12 can be pushed in or out on the guide member 31 to adjust the number. Preferably, the guide member 31 adopts a guide rail, and the roller seat 12 is slidably connected to the guide member 31 through a slider 32. The slider 32 is slidably arranged on the guide member 31. In order to facilitate the installation of the roller seat 12, a mounting plate 33 is provided on the slider 32. The mounting plate 33 is provided with a positioning pin 34. The roller seat 12 is provided with a positioning hole that cooperates with the positioning pin 34. The positioning pin 34 can be bolted into the positioning hole to realize the connection between the roller seat 12 and the mounting plate 33, and at the same time facilitate the installation and disassembly of the roller mechanism 10.

[0033] The supporting roller device 100 of the present invention is provided with a plurality of supporting roller mechanisms 10, and the supporting rollers 11 of each supporting roller mechanism 10 respectively abut against the plurality of diaphragm rolls 203 wound on the winding shaft 201, so that the pressure of each diaphragm roll 203 is individually controlled, thereby preventing the diaphragm roll 203 from loosening and smoothing the surface of the diaphragm roll 203, achieving good winding uniformity and uniform tension, thereby greatly improving the winding quality.

[0034] The above embodiments are only used to illustrate the present invention but not to limit the technical solutions described in the present invention. The understanding of this specification should be based on the technicians in the relevant technical field. For example, the directional descriptions such as "front", "back", "left", "right", "up", and "down" are described in detail in this specification with reference to the above embodiments. However, ordinary technicians in this field should understand that technicians in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A roller device, characterized in that: It comprises a plurality of groups of roller mechanisms corresponding to the plurality of groups of membrane rolls wound on the winding shaft, the roller mechanisms comprising a roller seat, a swing arm rotatably connected to the roller seat, a roller arranged on the swing arm, and a first driving member for driving the roller to abut against the membrane roll; Each of the plurality of roller mechanisms is provided with a first driving member; Each set of supporting roller mechanisms is provided with a set of independent driving components to independently drive the supporting rollers to rotate.

2. The roller device according to claim 1, characterized in that: The supporting roller mechanism comprises a pair of swing arms respectively connected to two axial ends of the supporting roller.

3. The roller device according to claim 2, characterized in that: The swing arms are provided with through holes at consistent positions for inserting connecting pieces, and fixing pieces for fixing the connecting pieces are provided outside the through holes, so as to realize synchronization of the movement of a pair of the swing arms.

4. The roller device according to claim 1, characterized in that: The supporting roller mechanism also includes a first positioning portion rotatably arranged on the swing arm, and the end of the supporting roller connected to the swing arm forms a second positioning portion, and the first positioning portion and the second positioning portion are plug-fitted to achieve the connection between the supporting roller and the swing arm.

5. The roller device according to claim 4, characterized in that: The first positioning portion is configured as a convex block, the second positioning portion is configured as a concave portion formed by being recessed inwardly, and a tail portion of the first positioning portion away from the second positioning portion is configured with an interception portion flush with the axial end surface of the supporting roller.

6. The roller device according to claim 4, characterized in that: Conical transmission is adopted between the first positioning part and the second positioning part.

7. The roller device according to claim 4, characterized in that: The first positioning portion is embedded in the contact surface of the supporting roller and has multiple groups of grooves.

8. The roller device according to claim 1, characterized in that: It also includes a shifting mechanism, which includes a guide member, the guide member is parallel to the winding shaft, and the roller mechanism is slidably arranged on the guide member.

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