CN219238896U - Winding and unwinding device and lithium battery production equipment - Google Patents

Abstract

The application relates to the field of material winding and unwinding, and particularly provides a winding and unwinding device and lithium battery production equipment. The winding and unwinding device comprises a frame; the rotating core is used for winding or discharging the material belt and is arranged on the frame in an axially movable manner; the deviation correcting detector is used for detecting the position of the material belt in the axial direction and is rotatably arranged to adapt to the angle change of the material belt; and the controller is in communication connection with the deviation rectifying detector and is electrically connected with the first power piece which drives the rotating core to move. The utility model provides a receive and releases reel device, automatic detection material takes the centering condition and rectify in real time, and rectify the rotation that the detector can produce angle variation adaptation material area, make the material area through effective detection range all the time, thereby can be close to receive and release the reel station, detect nearby, make the material area section that has the skew phenomenon reduce, overcome again because of detect nearby and have the pivoted factor of material area, make the material area remain the centering all the time, solved the material area and have the skew and influence production quality's problem among the prior art.

Description

Winding and unwinding device and lithium battery production equipment

Technical Field

The application relates to the field of material winding and unwinding, in particular to a winding and unwinding device and lithium battery production equipment.

Background

In the production of many products, all involve the automatic unreeling and automatic rolling process of material book. Such as cloth, belts, battery separator, automatic spreading and automatic winding of battery pole pieces. In the automatic unreeling process, the material roll or the paved material belt can deviate in the axial direction, so that a mechanism for carrying out operations such as coating and dyeing on the material belt cannot be accurately opposite to the material belt at any time, and the end part of the material roll wound during automatic winding is not neat, so that the product quality is influenced. For example, a battery diaphragm and a pole piece are wound to form a cylindrical battery cell, and if the end faces are not neat, the charge and discharge performance of the battery cell can be seriously affected.

Therefore, how to keep the material belt always in the middle of the frame, such as the rotating roller and the rotating core for collecting and discharging materials, is an important problem to be solved for automatic collecting and discharging materials.

Disclosure of Invention

In view of this, this application is directed at and provides a receive and releases the reel device, automatic detection material takes the centering condition and rectify in real time, and rectify the angle that the detector can produce angle variation adaptation material area when the change of reel, make the material area pass through effective detection range all the time, thereby can be close to receive and release the work station, near detection, make the material area section that has the skew phenomenon reduce, overcome again and had the material area to produce pivoted factor of failure because of near detection, make the material area remain the centering all the time, the material area has the skew condition and can influence the problem of production quality among the prior art has been solved.

The application provides a winding and unwinding device, which comprises a rack; the rotating core is used for winding or discharging the material belt and is arranged on the frame in an axially movable manner; the deviation correcting detector is used for detecting the position of the material belt in the axial direction and is rotatably arranged to adapt to the angle change of the material belt; and the controller is in communication connection with the deviation rectifying detector and is electrically connected with the first power piece which drives the rotating core to move.

In one possible embodiment, the method further comprises: the rotating cores are arranged on the two rotating seats and are both arranged on the rotating seat; the third power piece drives the overturning seat to rotate and is electrically connected with the controller, so that the controller controls and drives the second power piece of the deviation rectifying detector according to the rotation condition of the overturning seat to adjust the rotation angle of the deviation rectifying detector.

In one possible embodiment, the device further comprises a first rotating roller arranged on the frame and used for supporting the material belt, and the deviation correcting detector is positioned between the rotating core and the first rotating roller.

In one possible embodiment, a rotating rod, which is disposed between the deviation correcting detector and the second power member for driving the deviation correcting detector to rotate, is connected to a bracket for supporting the first rotating roller.

In one possible embodiment, the deviation correcting detector is a photoelectric sensor, and the material belt passes through a detection area of the photoelectric sensor.

In one possible embodiment, the turning base is provided with a guide structure for guiding the turning core.

In one possible embodiment, an automatic reel change mechanism is further provided, the automatic reel change mechanism comprising: the turnover seat and the third power piece;

the lifting arm is rotatably arranged on the frame and is provided with a second rotating roller for lifting the material belt;

the cutter is movably arranged on the lifting arm and is used for cutting off the material belt;

the fourth power piece driving the lifting arm to rotate and the fifth power piece driving the cutter to move are electrically connected with the controller uniformly.

In one possible embodiment, a third roller for lifting the material belt is further arranged on the lifting arm, the third roller is axially parallel to and spaced from the second roller, and the cutter is located between the second roller and the third roller.

In one possible implementation manner, the turnover seat is further provided with an avoiding roller for pressing down the material belt so as to avoid interference between the material belt and the turnover seat, and the avoiding roller is provided with at least two rollers respectively corresponding to the two rotating cores.

The application also provides lithium battery production equipment, which comprises the winding and unwinding device.

According to the winding and unwinding device, the rotating core is movably arranged on the frame along the axial direction, the deviation correcting detector detects the position of the material belt in the axial direction, and when the deviation of the material belt is detected, the controller controls the first power piece to drive the rotating core to axially move, so that the material belt is restored to the central position; and the deviation correcting detector is rotatably arranged, so that when the reel changing operation is carried out, the rotating core moves in the height direction relative to the frame to cause the spread material belt to deflect at an angle, the deviation correcting detector also rotates to adapt to the deflection angle of the material belt, and when the reel changing is completed, the material belt returns to the original angle again, and the deviation correcting detector also rotates back to the original angle position, so that the material belt is always in the detection range of the deviation correcting detector, and the material belt is detected in real time and corrected in real time. Therefore, the winding and unwinding device provided by the application not only realizes real-time automatic correction and centering on the material belt, but also on one hand, only drives the rotating core to move when correcting, but not the whole movement of the rack or the large bracket, has simple structure, simple correction operation and quicker correction action, and can use small-specification power compared with the whole correction, thereby saving the cost to a certain extent; on the other hand, the deviation correcting detector can rotate to adapt to the angle change of the material belt, the deviation correcting detector can be close to the winding and unwinding station to rotate the core, the material belt section close to the rotating core can generate the angle deflection under the conditions of reel changing and the like, the material belt section with the deviation phenomenon is reduced, the centering quality is improved, the defect that the material belt can generate rotation due to the nearby detection is overcome, the material belt is always passed through the effective detection range, the centering condition of the material belt is detected in real time and corrected in real time, the material belt is always kept centered, the deviation correcting centering effect is good, and the defect problem caused by the material belt deviation in the prior art is solved.

Drawings

Fig. 1 is a schematic view of a first use state of a winding and unwinding device according to an embodiment of the present application;

FIG. 2 is a schematic view of the winding and unwinding device in a second use state according to the embodiment of the present application;

fig. 3 is a schematic view of the winding and unwinding device in the third use state according to the embodiment of the present application.

In fig. 1-3:

1. a frame; 2. turning over the seat; 3. a first rotating core; 4. a second rotating core; 5. a material roll; 6. a material belt; 7. a deviation correcting detector; 8. a first rotating roller; 9. avoiding the rotating roller; 10. a slide; 11. lifting the arm; 12. a second roller; 13. a cutter; 14. and a third roller.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Referring to fig. 1-3, an embodiment of the present application provides a winding and unwinding device, which includes a frame 1, a rotating core, a controller, and a deviation rectifying component. A rotating core is rotatably provided on the frame 1, which rotates for winding the web 6 to form the roll 5, or releases the web 6 to spread the roll 5 wound thereon. Meanwhile, the rotating core is movably disposed on the frame 1 in the axial direction, for example, both axial ends of the rotating core are rotatably connected to the slide carriage 10, and the slide carriage 10 is slidably disposed on the frame 1 in the axial direction of the rotating core. The deviation rectifying assembly is used for enabling the deviated material belt 6 to move back to the center position and comprises a deviation rectifying detector 7 and a first power piece. The deviation correcting detector 7 is arranged on the frame 1 and is used for detecting the position of the material belt 6 spread on the frame 1 in the axial direction. One end of the material belt 6 is connected with the rotating core, and the other end extends out of the machine frame 1 and is spread by the support of the rotating roller on the machine frame 1. The deviation detector 7 is located downstream of the rotating core and detects a certain section of the spread web 6, and the deviation detector 7 may be arranged in the vicinity of a certain rotating roll, for example a first rotating roll 8 located downstream of and closest to the rotating core, as shown in fig. 1, to detect a section of the web close to the rotating core. The first power piece is used for driving the rotating core to axially displace. The controller is in communication connection with the deviation rectifying detector 7 and is electrically connected with the first power piece so as to start and stop the first power piece according to the signal of the deviation rectifying detector 7.

In the process of unreeling or reeling the rotary core, the material belt 6 basically does not generate angle deflection, the material belt 6 always passes through the detection range of the deviation correcting detector 7, and the deviation correcting detector 7 detects in real time. When the deviation correcting detector 7 detects that the material belt 6 deviates, the controller controls the first power member to drive the rotating core to axially move, the moving distance is matched with the deviation dimension of the material belt, so that the material belt 6 is restored to the center position, for example, the first power member drives the rotating core to right to shift by the corresponding dimension when the material belt 6 is detected to shift left relative to the center position (to shift left towards the left in the axial direction and shift right towards the right in the axial direction), and the material belt 6 is restored to the center. So that the material strip spread out from the winding and unwinding device, or the material strip wound onto the rotating core, is in a centered position. And when correcting, only the rotating core is driven to move for adjustment, but not the whole frame 1 or the large bracket (such as a turning seat in the embodiment below) is moved, so that the whole correction is changed into the individual correction, the structure is simplified, the correction operation is simple, the correction action is quicker, the required power consumption is less than that of the whole correction, small-size power can be used, and the cost is saved to a certain extent.

When replacing the roll 5, i.e. the used rotating core, the rotating core that needs to be replaced will change in height, the belt section that is close to the rotating core will rotate, and the angle will change, as shown in fig. 2. Also, in the present application, therefore, the deviation rectifying detector 7 is rotatably provided on the frame 1, and is capable of performing an angle change to accommodate the angle change of the section of the material tape. Thus, the deviation correcting detector 7 in the present application may be arranged at a position close to the winding and unwinding station, i.e. the rotating core, for example, at a position of use where winding or unwinding is performed next to the winding and unwinding station, i.e. the rotating core, as shown in fig. 1, between the rotating core and the first rotating roller 8 closest to the rotating core. When the reel change operation is performed, the deviation correcting detector 7 is rotated by a corresponding angle according to the height change condition of the rotating core to be replaced, so that the deviation correcting detector 7 is adapted to the deflection angle of the section of the material belt, and the material belt 6 is ensured to always pass through the detection range of the deviation correcting detector 7; when the material belt 6 is connected with a new rotating core, as shown in fig. 3, the material belt can return to the original angle again after the reel change is completed, and the deviation rectifying detector 7 also rotates back to the original angle position, so that the detection range of the material belt 6 always approaches the deviation rectifying detector 7 is ensured, and the real-time detection and real-time deviation rectifying of the material belt 6 are maintained. And because the deviation correcting detector 7 is arranged close to the working position of the rotating core, the deviation correcting reaction is quick in time, the material belt section with the deviation phenomenon is reduced, and the centering quality is improved.

The winding and unwinding device provided by the application not only automatically detects the centering condition of the material belt and rectifies the material belt in real time to keep the centering, but also only drives the rotating core to move instead of the whole movement of the rack or the large bracket during rectification, so that the winding and unwinding device has simple structure, simple rectification operation and quicker rectification action, and the required power has less power consumption compared with the whole rectification, can use small-specification power, and saves the cost to a certain extent; on the other hand, the deviation correcting detector can rotate to adapt to the angle change of the material belt, the deviation correcting detector can be close to the winding and unwinding station to rotate the core, the material belt section close to the rotating core can generate the angle deflection under the conditions of reel changing and the like, the material belt section with the deviation phenomenon is reduced, the centering quality is improved, the defect that the material belt can generate rotation due to the nearby detection is overcome, the material belt is always passed through the effective detection range, the centering condition of the material belt can be detected in real time and corrected in real time in the whole working process, the material belt is always kept centered, the deviation correcting centering effect is good, and the defect problem caused by the deviation of the material belt 6 in the prior art is solved.

The rotation of the deviation rectifying detector 7 can be realized by driving the second power member. The second power piece is connected with the controller. The controller controls the second power member according to the movement of the rotating core when changing the reel, thereby adjusting the rotation angle of the deviation correcting detector 7.

Specifically, in order to facilitate replacement of the roll 5, i.e. the used rotating cores, at least two rotating cores, for example, a first rotating core 3 and a second rotating core 4, are usually provided on the frame 1. In some embodiments, the frame 1 is further provided with a turnover seat 2 rotatable around its own axis, and the first rotating core 3 and the second rotating core 4 are both disposed on the turnover seat 2, and when the used rotating core needs to be replaced, the turnover seat 2 is rotated, and the positions of the two rotating cores are adjusted, so that the replaced rotating core is rotated away from the use position, and the rotating core to be used is moved to the use position. For example, the first rotating core 3 and the second rotating core 4 are respectively disposed at different circumferential positions of the flip seat 2, distributed around the circumference of the rotating shaft, such as on both sides in the radial direction of the rotating shaft. When the first rotating core 3 is in the use state, as shown in fig. 1, the first rotating core 3 is located at the use position and is closer to the direction in which the first rotating roller 8 and the material belt 6 extend, when the first rotating core 3 is used and the second rotating core 4 is needed, the turning seat 2 rotates, the first rotating core 3 rotates away from the use position, the second rotating core 4 rotates to the use position, as shown in fig. 2, when the second rotating core 4 rotates to the use position, the old material belt still connected with the first rotating core 3 is firstly connected with the second rotating core 4 or the material roll on the second rotating core 4, and then the old material belt 6 is cut off through the cutter 13, so that the material belt 6 is disconnected with the first rotating core 3 and is only connected with the second rotating core 4, as shown in fig. 3, and the second rotating core 4 can be used. In fig. 1, the first rotating core 3 is used for winding, and the second rotating core 4 is not used yet; fig. 3 shows the case when the first rotating core 3 is unreeled and the second rotating core 4 is replaced after the first rotating core 3 is unreeled.

The turnover seat 2 rotates around the axis of the turnover seat 2 through the driving of the third power piece, and the third power piece is electrically connected with the controller, so that on one hand, the turnover seat 2 can be automatically driven to move to automatically change a coil, and on the other hand, the controller controls the start and stop of the second power piece according to the rotation condition of the third power piece or the turnover seat 2 to adjust the rotation angle of the deviation rectifying detector 7, so that the deviation rectifying detector 7 rotates to match the deflection of the belt 6, and the belt 6 is ensured to always pass through the effective detection range. Therefore, the rotation angle of the deviation correcting detector 7 can be accurately matched with the rotation condition of the turnover seat 2.

The rotation condition of the third power piece or the turnover seat 2 can be obtained by detecting the rotation angle or the rotation position of the turnover seat 2 in real time by a position detector which is in communication connection with the controller and transmits a detection signal to the controller. The position detector may be an encoder for detecting the rotation angle of the flip 2.

Of course, in other embodiments, the two rotating cores may be replaced by other moving modes, for example, the two rotating cores are lifted, the first rotating core 3 is lifted to leave the use position after being used, the second rotating core 4 is lifted to leave the use position after being used, and the first rotating core 3 is lifted to return to the use position after the second rotating core 4 is used.

In a preferred embodiment, the first roll 8, which is arranged on the frame 1 and is intended to support the material web 6, is the roll closest to the turret 2 during normal winding or unwinding. And a deviation correcting detector 7 is positioned between the turning seat 2 and the first turning roll 8 and is used for detecting the axial position of the section of the material belt 6 positioned between the turning seat 2 and the first turning roll 8. The axial position of the section of material belt 6 is detected, so that the material belt is suitable for unreeling and reeling, and the material belt 6 wound on the rotating core can be ensured to be neat in end part.

The deviation correcting detector 7 may be a photoelectric sensor, and the side area of the material belt 6 always passes through the detection area of the photoelectric sensor.

The deviation rectifying detector 7 is arranged on one side of the first rotating roller 8, which is close to the turnover seat 2, and is close to the first rotating roller 8. In some embodiments, a rotating rod, disposed between the deviation rectifying detector 7 and the second power member, is connected to a bracket supporting the first rotating roller 8.

When the deviation rectifying detector 7 detects that the material belt 6 is deviated, the first power piece drives the rotating core to axially displace. The rotating core is arranged on the turnover seat 2 and axially moves relative to the turnover seat 2 without moving the whole turnover seat 2, so that the structure is simplified. In some embodiments, the turning seat 2 is provided with a guiding structure for guiding the turning core, and the turning core can be accurately moved along the axial direction through the guiding structure.

The guide structure comprises a sliding rail fixedly connected with the turnover seat 2 and a sliding seat 10 fixedly connected with the rotating core, the extending direction of the sliding rail is the axial direction of the rotating core, and the sliding seat 10 is slidingly arranged on the sliding rail and moves along the sliding rail along with the rotating core.

When carrying out the roll change, in order to avoid material area 6 and upset seat 2 to produce and interfere, for example material area 6 pastes and wraps up in upset seat 2, still be provided with on the upset seat 2 and be used for supporting the roll 9 of dodging of pressing material area 6, dodge roll 9 be provided with two, respectively with two rotation cores correspond the setting. When the first rotating core 3 rotates away from the using position and the material belt 6 is not cut off, the material belt 6 is close to the overturning seat 2, and the avoiding rotating roller 9 close to the first rotating core 3 is used for pressing down the material belt 6, so that interference between the material belt 6 and the overturning seat 2 can be prevented, as shown in fig. 3. Meanwhile, the avoiding rotary roller 9 is propped against the material belt 6, so that a certain effect of tensioning the material belt can be achieved, and the deviation condition of the material belt is weakened.

The roll change is performed by the rotation of the turnover seat 2, and the roll change can be manually operated or automatically operated. In some embodiments, an automatic reel changing mechanism is provided on the frame 1, and the automatic reel changing mechanism includes the above-mentioned turnover seat 2 and a third power member, and further includes a lifting arm 11, a cutter 13, a fourth power member driving the lifting arm 11 to rotate, and a fifth power member driving the cutter 13 to move. The lifting arm 11 is rotatably arranged on the frame 1 and has a second roller 12 which lifts the material web 6. The fourth power element drives the lifting arm 11 to rotate so as to lift the second rotating roller 12, which can lift the second rotating roller 12 to contact the material belt 6, for example, the material belt 6 between the first rotating core 3 and the first rotating roller 8 which rotate away from the using position, and then lift the material belt 6, as shown in fig. 2 and 3, the second rotating roller 12 lifts the material belt 6 so that a part section of the material belt 6 is connected with the material roll 5 which rotates to the second rotating core 4 or the second rotating core 4 at the using position. The cutter 13 is movably disposed on the lifting arm 11, for example, in a liftable manner, and is driven by the fifth power member to move up and down. When a partial section of the web 6 is connected to the second rotary core 4 by lifting the second rotary roller 12, the cutter 13 moves upward to cut the web 6 (the cutting position is located in front of the connected section as shown in fig. 3), so that the web 6 is connected to the first rotary core 3. In this way, the material belt 6 is connected only to the second rotating core 4, and the reel change operation is completed.

From the above description and the illustrations of fig. 1 to 3, it can be seen that, during reel change, the material belt 6 between the turnover seat 2 and the first rotating roller 8 will deflect relative to the first rotating roller 8, as shown in fig. 2, and in this case, the second power member drives the deviation correcting detector 7 to rotate so as to adapt to the angle change of the material belt 6, and when the reel change is completed, as shown in fig. 3, the second power member drives the deviation correcting detector 7 to rotate so as to adapt to the angle of the material belt 6 in both cases. In fig. 2 and 3, two end angles of the material web 6 are shown, respectively.

The above-mentioned material belts 6 each refer to a material belt section located between the rotating core and the first rotating roller 8, and cannot be maliciously interpreted.

As shown in fig. 3, the lifting arm 11 is further provided with a third rotating roller 14, the third rotating roller 14 is axially parallel to and spaced from the second rotating roller 12, and the cutter 13 is located between the second rotating roller 12 and the third rotating roller 14.

In some embodiments, the rotation axis of the lifting arm 11 is arranged coaxially with the rotation axis of the first rotation roller 8; alternatively, the rotation axis of the lifting arm 11, the rotation axis of the first rotation roller 8 and the rotation axis of the deviation correcting detector 7 are all coaxially arranged.

The second power piece, the third power piece and the fourth power piece can be motors, and the first power piece and the fifth power piece can be cylinders.

The embodiment of the application also provides lithium battery production equipment, which comprises the winding and unwinding device. The lithium battery production equipment can generate the deflection condition of the material belt when the angle change is suitable for the conditions of reel change and the like, so that the material belt always passes through the detection range, the centering condition of the material belt is automatically detected in real time, the correction is performed in real time, the material belt is kept centered, and the correction effect is good. The deducing process of the beneficial effects is basically identical to that of the winding and unwinding device in the above embodiment, and will not be described herein.

In some embodiments, the lithium battery production device comprises two winding and unwinding devices, which are distributed at two ends of the material belt, one winding device is used for winding and the other winding device is used for winding, and a dyeing mechanism for dyeing the material belt is arranged between the two winding and unwinding devices.

The basic principles of the present application have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not limiting, and these advantages, benefits, effects, etc. are not to be considered as necessarily possessed by the various embodiments of the present application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not intended to be limited to the details disclosed herein as such.

The components, arrangements, etc. referred to in this application are meant to be illustrative examples only and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the drawings. These components, devices, may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.

It should also be noted that in the apparatus, devices of the present application, the components may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent to the present application.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

It should be understood that the terms "first," "second," "third," "fourth," and "fifth" used in the description of the embodiments of the present application are merely used for more clearly describing the technical solutions, and are not intended to limit the protection scope of the present application.

The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.

The foregoing description of the preferred embodiments of the present utility model is not intended to limit the utility model to the precise form disclosed, and any modifications, equivalents, and alternatives falling within the spirit and principles of the present utility model are intended to be included within the scope of the present utility model.

Claims (10)

1. A winding and unwinding device, comprising:

a frame;

the rotating core is used for winding or discharging the material belt and is arranged on the frame in an axial moving way;

the deviation correcting detector is used for detecting the position of the material belt in the axial direction and is rotationally arranged to adapt to the angle change of the material belt;

and the controller is in communication connection with the deviation rectifying detector and is electrically connected with the first power piece which drives the rotating core to move.

2. The unwind and wind-up device of claim 1, further comprising:

the rotating cores are arranged on the two rotating seats and are both arranged on the rotating seat;

the third power piece drives the overturning seat to rotate and is electrically connected with the controller, so that the controller controls and drives the second power piece of the deviation rectifying detector according to the rotation condition of the overturning seat to adjust the rotation angle of the deviation rectifying detector.

3. The unwind and wind-up device of claim 1, further comprising a first roller disposed on said frame for supporting a web, said deviation-correcting detector being located between said rotating core and said first roller.

4. A wind-up and wind-down device according to claim 3, wherein a rotating rod is provided between the deviation correcting detector and the second power member for driving the deviation correcting detector to rotate, and is connected to a bracket for supporting the first rotating roller.

5. The unwind and wind-up device of claim 1, wherein said deviation-correcting detector is a photoelectric sensor and the web passes through a detection area of said photoelectric sensor.

6. A winding and unwinding device according to claim 2, characterized in that said turning base is provided with guiding means for guiding said turning core.

7. The reel-up of claim 2, further provided with an automatic reel change mechanism comprising:

the turnover seat and the third power piece;

the lifting arm is rotatably arranged on the frame and is provided with a second rotating roller for lifting the material belt;

the cutter is movably arranged on the lifting arm and is used for cutting off the material belt;

the fourth power piece driving the lifting arm to rotate and the fifth power piece driving the cutter to move are electrically connected with the controller uniformly.

8. The winding and unwinding device according to claim 7, wherein a third roller for lifting the material belt is further provided on the lifting arm, the third roller is axially parallel to and spaced apart from the second roller, and the cutter is located between the second roller and the third roller.

9. The winding and unwinding device according to claim 2, wherein the turnover seat is further provided with an avoidance roller for pressing down the material belt so as to avoid interference between the material belt and the turnover seat, and the avoidance roller is provided with at least two avoidance rollers respectively corresponding to the two rotation cores.

10. A lithium battery production apparatus comprising the winding and unwinding device according to any one of claims 1-9.

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