Unwinding device and shaft assembly thereof

Abstract

The present application relates to the field of polar winding unwinding, and specifically provides a kind of unwinding device and its shaft assembly, to solve the problem of existing coaxial storage feeding device, artificial gap needs to be provided between dynamic polar winding and static polar winding, to ensure that dynamic and static polar winding will not be affected, leading to lower feeding efficiency.For this purpose, the shaft assembly of the unwinding device of the present application comprises: a bearing shaft for bearing polar winding;Unwinding sleeve, which is rotatably arranged at the first end of the bearing shaft;Springback assembly, which is arranged at the first end of the bearing shaft;Feeding assembly, which can drive the polar winding on the bearing shaft to move across the springback assembly to the unwinding sleeve, the springback assembly can drive the polar winding on the bearing shaft to move to the second end of the bearing shaft, so that the polar winding on the unwinding sleeve is separated from the polar winding on the bearing shaft, the unwinding sleeve drives the polar winding to unwind, the polar winding on the unwinding sleeve will not drive the polar winding on the bearing shaft to rotate due to friction, which ensures the quality of unwinding, and also ensures that the polar winding on the bearing shaft will not be damaged due to rotation.

Description

Technical Field

[0001] This invention relates to the field of polar roll unwinding, and specifically provides an unwinding device and its shaft assembly. Background Technology

[0002] Currently, in the production process of new energy battery cells, battery electrode rolls, which are the raw materials for battery production, need to be fed during production. Traditional production processes use AGV (Automated Guided Vehicle) carts for automatic feeding, but this still mainly involves single-roll transportation, resulting in numerous transport operations and long waiting times for the AGVs. To solve the problem of long waiting times, existing technologies mostly use coaxial storage for feeding. However, a gap needs to be manually provided between dynamic and static electrode rolls to ensure that they do not interfere with each other. This human intervention greatly reduces feeding efficiency.

[0003] Therefore, there is an urgent need in the relevant fields for an unwinding device and its shaft assembly to solve the above-mentioned technical problems. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problem that existing coaxial storage and feeding devices require a gap to be manually provided between dynamic and static electrode rolls in order to ensure that the dynamic and static electrode rolls do not interfere with each other, resulting in low feeding efficiency.

[0005] In a first aspect, the present invention provides a shaft assembly for an unwinding device, the shaft assembly comprising:

[0006] The bearing shaft is used to support the pole roll;

[0007] The unwinding sleeve is rotatably disposed at the first end of the bearing shaft;

[0008] A springback assembly is disposed at the first end of the bearing shaft;

[0009] The feeding assembly can drive the pole roll on the bearing shaft to move across the springback assembly to the unwinding sleeve. The springback assembly can drive the pole roll on the bearing shaft to move toward the second end of the bearing shaft. The unwinding sleeve can drive the pole roll on the unwinding sleeve to unwind.

[0010] In a specific embodiment of the shaft assembly of the above-mentioned unwinding device, the springback assembly includes:

[0011] Driver block;

[0012] The second power assembly is capable of driving the drive block to pop outward from inside the bearing shaft.

[0013] In a specific embodiment of the shaft assembly of the unwinding device described above, the side of the springback assembly near the second end includes: a first inclined surface; and / or, the side of the springback assembly (4) near the first end includes: a second inclined surface.

[0014] In a specific embodiment of the shaft assembly of the unwinding device described above, a first elastic element is disposed on the side of the drive block near the first end. The first elastic element is capable of driving the drive block to move toward the second end, so that the drive block drives the pole roll to move toward the second end.

[0015] In a specific embodiment of the shaft assembly of the above-mentioned unwinding device, the springback assembly includes a sliding base, on which a sliding groove is provided, the driving block is slidably disposed within the sliding groove, and the first elastic element and / or the second power assembly are disposed within the sliding groove; and / or

[0016] The rebound assembly also includes a buffer block disposed at the second end of the sliding groove.

[0017] In a specific embodiment of the shaft assembly of the unwinding device described above, the second power assembly includes a second elastic element, the two ends of which act on the drive block and the sliding base, respectively.

[0018] In a specific embodiment of the shaft assembly of the unwinding device described above, the second power assembly includes a magnetic element and an electromagnet, one of which is disposed on the sliding base and the other is disposed on the drive block. After the electromagnet is energized, the magnetic element and the electromagnet repel each other, thereby driving the drive block to pop outward from inside the bearing shaft.

[0019] In a specific embodiment of the shaft assembly of the above-mentioned unwinding device, there are multiple spring-back components arranged circumferentially along the bearing shaft; and / or,

[0020] The spring-loaded assembly is not installed above the bearing shaft.

[0021] In a specific embodiment of the shaft assembly of the unwinding device described above, the shaft assembly further includes a drive shaft, the bearing shaft is a hollow shaft, the drive shaft is rotatably disposed inside the bearing shaft and connected to the unwinding sleeve, and the drive shaft is capable of driving the unwinding sleeve to rotate.

[0022] In a specific embodiment of the shaft assembly of the above-mentioned unwinding device, the feeding assembly includes a feeding plate and a second driving member. The feeding plate is sleeved on the bearing shaft and can move along the axial direction of the bearing shaft.

[0023] The second driving member can drive the feeding plate to move towards the first end for feeding; and / or can drive the feeding plate to move towards the second end for returning to its original position.

[0024] In a second aspect, the present invention provides an unwinding device comprising:

[0025] The shaft assembly as described above;

[0026] The second end of the bearing shaft is fixed to the fixed base;

[0027] A first driving member is connected to the unwinding sleeve, and the first driving member is used to drive the unwinding sleeve to rotate in order to unwind the pole roll.

[0028] When the above technical solution is adopted, the unwinding device of the present invention has multiple pole rolls sleeved on the bearing shaft. When feeding is required, the feeding component can drive the pole rolls on the bearing shaft to move across the springback component to the unwinding sleeve. The springback component can drive the pole rolls on the bearing shaft to move towards the second end of the bearing shaft, that is, the pole rolls on the unwinding sleeve are separated from the pole rolls on the bearing shaft. During the rotation of the unwinding sleeve, the unwinding sleeve drives the pole rolls on the unwinding sleeve to unwind. Since the pole rolls on the unwinding sleeve and the pole rolls on the bearing shaft are separated, the pole rolls on the unwinding sleeve cannot drive the pole rolls on the bearing shaft to rotate due to friction, thus ensuring the unwinding quality and also ensuring that the pole rolls on the bearing shaft are not damaged due to rotation.

[0029] The outer diameter of the bearing shaft gradually increases in a stepped manner from the first end to the second end, which enables the bearing shaft to withstand a large torque without deformation, ensuring stable power transmission of the drive shaft, while also ensuring the stability of the unwinding sleeve rotation, thereby ensuring the stability of unwinding.

[0030] The bearing shaft, drive shaft and unwinding sleeve are arranged coaxially, which makes the unwinding device simple and compact in structure and improves the feeding efficiency. Attached Figure Description

[0031] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0032] Figure 1 This is a schematic diagram of the unwinding device provided by the present invention. Figure 1 ;

[0033] Figure 2 This is a schematic diagram of the unwinding device provided by the present invention. Figure 2 ;

[0034] Figure 3 This is a schematic diagram of the unwinding device provided by the present invention. Figure 3 ;

[0035] Figure 4 This is a schematic diagram of the shaft assembly provided by the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the springback assembly provided by the present invention;

[0037] Figure 6 This is a cross-sectional view of the springback assembly provided by the present invention. Figure 1 ;

[0038] Figure 7 This is a cross-sectional view of the springback assembly provided by the present invention. Figure 2 .

[0039] List of reference numerals in the attached diagram:

[0040] 1. Shaft assembly; 11. Unwind sleeve; 12. Air duct; 13. Drive shaft; 14. Bearing shaft; 15. Mounting base;

[0041] 2. Feeding assembly; 21. Feeding plate; 22. Connecting rod; 23. Slide rail; 24. Slider; 25. Connecting plate; 26. Second drive component;

[0042] 3. First driving component; 4. Rebound assembly; 41. Sliding base; 42. End cap; 44. Driving block; 45. Sliding groove; 46. Buffer block; 47. First elastic component; 48. Second power assembly; 5. Base;

[0043] 100. Extreme roll. Detailed Implementation

[0044] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0045] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] To address the issue of low loading efficiency caused by the need for a manual gap between dynamic and static electrode rolls in existing coaxial storage and loading devices to prevent interference between them, the following measures are needed. Figure 1-7As shown, this embodiment discloses an unwinding device, which includes a shaft assembly 1, a fixed base 15, a first driving member 3, and a base 5. The fixed base 15, the first driving member 3, and the second driving member 26 are all disposed on the base 5, and the second end of the bearing shaft 14 is fixed on the fixed base 15.

[0048] Among them, such as Figure 4 As shown, the shaft assembly 1 includes a support shaft 14, an unwinding sleeve 11, a springback assembly 4, a feeding assembly 2, and a drive shaft 13. The support shaft 14 is used to support the pole rolls 100, and several pole rolls 100 can be fitted onto the support shaft 14. The number of fitted pole rolls is determined according to the length of the support shaft 14 and the width of the pole rolls 100. The support shaft 14 is a hollow shaft, and its outer diameter gradually increases in a stepped manner from the first end to the second end, specifically, the outer diameter is larger closer to the second end. The largest part of the outer diameter of the support shaft 14 is fixed on the fixing seat 15.

[0049] like Figure 1-4 As shown, the unwinding sleeve 11 is rotatably mounted on the first end of the bearing shaft 14. Specifically, the first end of the bearing shaft 14 is a stepped shaft with a small outer diameter. The unwinding sleeve 11 is fitted onto the first end of the bearing shaft 14 and is rotatably connected via bearings. The drive shaft 13 is rotatably mounted inside the bearing shaft 14. Specifically, bearings are provided at both ends of the drive shaft 13, and the bearings are embedded in the shaft holes of the bearing shaft 14. The first end of the drive shaft 13 is fixedly connected to the unwinding sleeve 11. The drive shaft 13 can drive the unwinding sleeve 11 to rotate, thereby driving the pole roll 100 on the unwinding sleeve 11 to unwind. The first drive member 3 is driven by the drive shaft 13. The first drive member 3 is used to drive the drive shaft 13 to rotate in order to unwind the pole roll 100. Specifically, the first drive member 3 is a motor. The output end of the first drive member 3 is driven by the drive shaft 13 via gears. In other embodiments, it can also be driven by a coupling, conveyor belt, or chain. In this embodiment, the pole roll 100 is supported by a bearing shaft 14, and the drive shaft 13 is not subjected to the gravity of the pole roll 100, which improves the reliability of the equipment. The design of the unwinding sleeve 11 being sleeved on the bearing shaft 14 and the bearing shaft 14 providing support for the unwinding sleeve 11 improves the stability of unwinding.

[0050] The unwinding sleeve 11 is an air-expanding shaft, specifically made of rubber or silicone. The drive shaft 13 is a hollow shaft, and an air passage 12 is provided inside the shaft hole of the drive shaft 13. The air passage 12 can inflate and deflate the air-expanding shaft. The air passage 12 is specifically a pipe, and an interface is led out at the second end of the drive shaft 13. The interface is connected to an air tank or air compressor, etc., to inflate and deflate the air-expanding shaft. During the feeding of the unwinding sleeve 11 and the replenishment of the bearing shaft 14, the unwinding sleeve 11 is deflated to retract for feeding or replenishment. When unwinding is required after feeding, the unwinding sleeve 11 is inflated to tightly fit the electrode roll 100, so that the unwinding sleeve 11 can drive the electrode roll 100 to rotate for unwinding.

[0051] like Figure 4-7 As shown, the springback assembly 4 is disposed at the first end of the support shaft 14, specifically embedded in the support shaft 14, and located on the side of the unwinding sleeve 11 near the second end of the support shaft 14. The springback assembly 4 can drive the pole roll 100 on the support shaft 14 to move towards the second end of the support shaft 14. Specifically, the springback assembly 4 includes a drive block 44, a sliding base 41, a buffer block 46, a first elastic element 47, and a second power assembly 48.

[0052] A groove is provided on the bearing shaft 14, and a sliding base 41 is embedded in the groove and arranged along the axial direction of the bearing shaft 14. A sliding groove 45 is provided on the sliding base 41, and a blocking part is provided on both sides of the groove opening. A driving block 44 is slidably disposed in the sliding groove 45, and the driving block 44 can move along the axial direction of the bearing shaft 14.

[0053] The first elastic element 47 is disposed on the side of the drive block 44 near the first end and is located within the sliding groove 45. Specifically, the first elastic element 47 is a compression spring. A convex shaft is provided at the first end of the drive block 44, and one end of the compression spring is sleeved on the convex shaft and abuts against the drive block 44. An end cap 42 is provided at the first end of the sliding base 41 and is fixed to the sliding base 41. A receiving groove is provided on the end cap 42, and the first end of the compression spring is embedded in the receiving groove. The first elastic element 47 can drive the drive block 44 to move towards the second end, so that the drive block 44 drives the electrode roll 100 to move towards the second end. A buffer block 46 is provided at the second end of the sliding groove 45, that is, a buffer block 46 is fixed at the second end of the sliding base 41, specifically made of rubber or silicone. The buffer block 46 serves a buffering function to prevent the drive block 44 from being damaged by collision.

[0054] The second power assembly 48 is disposed on the back of the drive block 44. The second power assembly 48 can drive the drive block 44 to pop outward from the bearing shaft 14, so that the drive block 44 can drive the pole roll 100 to move. Specifically, the second power assembly 48 includes a second elastic element located in the sliding groove 45, and a convex shaft is provided at the bottom of the sliding groove 45. The second elastic element is specifically a compression spring, one end of which is sleeved on the convex shaft. A receiving groove is provided on the back of the drive block 44, and the other end of the compression spring is embedded in the receiving groove. There are two second elastic elements, which are spaced apart along the length direction of the drive block 44.

[0055] Regarding the second power assembly, it should be noted that although the second power assembly in this embodiment includes a second elastic element, this is not a limitation of the invention. In other embodiments, those skilled in the art can choose other driving forms, such as pneumatic components, electric components, or electromagnets. For example, the second power assembly may include a magnetic component and an electromagnet, with one of the magnetic component and the electromagnet disposed on the drive block 44 and the other on the sliding base 41. Specifically, the magnetic component is a permanent magnet and is disposed on the back of the drive block 44. The electromagnet is disposed at the bottom of the sliding groove 45. After the electromagnet is energized, the magnetic component and the electromagnet repel each other, and the magnetic repulsion force drives the drive block 44 to pop outward from the bearing shaft 14. After power is cut off or the electrode direction is switched, the magnetic attraction force allows the drive block 44 to retract back into the bearing 14. The electromagnet only requires a wire for energization, making its structure relatively simple. Furthermore, the electromagnet's electromagnetic force can be changed according to the magnitude of the current, and the external elastic force of the drive block 44 can be adjusted according to the type of pole coil 100, making its application range wider. These do not deviate from the basic principles of non-invention, and therefore all fall within the protection scope of this invention.

[0056] The second end of the drive block 44 is a first inclined surface, and the first end is a second inclined surface. Both the first and second inclined surfaces are inclined to the outer side of the drive block 44. During roll changing, the feeding assembly 2 drives the pole roll 100 on the bearing shaft 14 to move towards the unwinding sleeve 11. The pole roll 100 can abut against the first inclined surface, allowing the drive block 44 to overcome the resistance of the second elastic element and move inward, thereby allowing the pole roll 100 to move across the springback assembly 4 to the unwinding sleeve 11. After the roll changing is completed, the drive block 44 pops outward under the action of the second elastic element. At the same time, the first elastic element drives the drive block 44 to move towards the second end, which can drive the pole roll 100 on the bearing shaft 14 to move towards the second end, separating it from the pole roll 100 on the unwinding sleeve 11. When the bearing shaft 14 is being replenished, the pole roll 100 abuts against the second inclined surface so that the drive block 44 moves inward against the elastic force of the second elastic member 48 so that the pole roll 100 can cross the springback assembly 4 and then move onto the bearing shaft 14.

[0057] Regarding the first elastic element 47, it should be noted that although the first elastic element is selected to be provided in this embodiment, it is also possible to omit it. When feeding the unwinding sleeve 11, the pole roll 100 is driven to move by the first inclined surface when the drive block 44 moves outward.

[0058] Multiple spring-loaded components 4 are arranged circumferentially along the bearing shaft 14. In this embodiment, three are preferred and evenly arranged circumferentially along the bearing shaft 14. Furthermore, spring-loaded components 4 are not placed directly above the bearing shaft 14 to avoid the spring-loaded components 14 being unable to function due to the weight of the pole roll 100. In addition, providing multiple spring-loaded components 4 allows the pole roll 100 to move smoothly to the second end, and even if one is damaged, the others can continue to work, ensuring the reliability and service life of the unwinding device.

[0059] Continue to refer to Figure 1-4 The feeding assembly 2 drives the pole roll 100 on the support shaft 14 to move across the springback assembly 4 onto the unwinding sleeve 11. The feeding assembly 2 includes a feeding plate 21 and a second driving member 26. The feeding plate 21 is sleeved on the support shaft 14 and can move along the axial direction of the support shaft 14. The feeding plate 21 is slidably connected to the base 5 through a sliding assembly, which includes a slide rail 23, a slider 24, and a connecting rod 22. The slide rail 23 is disposed on the base 5, and the slider 24 is slidably disposed on the slide rail 23. The slider 24 is connected to the output end of the second driving member 26, and the connecting rod 22 connects the feeding plate 21 and the slider 24. The second driving member 26 can drive the feeding plate 21 to move through the slider 24 and the connecting rod 22. More specifically, there are two sliding assemblies, located on both sides of the support shaft 14. The two sliders 24 are connected by a connecting plate 25, and the two connecting rods 22 are respectively connected to both sides of the feeding plate 21. Support plates extend from both sides of the fixed base 15, and the connecting rod 22 is slidably inserted through the support plates. The second driving member 26 can drive the feeding plate 21 to move towards the first end for feeding; it can also drive the feeding plate 21 to move towards the second end for returning to its original position. The second driving member 26 is specifically a linear driving member, such as an electric actuator or a cylinder.

[0060] The working process of the unwinding device:

[0061] The unwinding sleeve 11 is deflated, and the bearing shaft 14 is replenished with material. Multiple pole rolls 100 are then mounted on the bearing shaft 14 and the unwinding sleeve 11. Under the action of the springback assembly 4, the unwinding pole rolls 100 on the bearing shaft 14 are separated from the spare pole rolls 100 on the unwinding sleeve 11. Then, the unwinding sleeve 11 is inflated, and the first drive member 3 drives the pole rolls 100 on the unwinding sleeve 11 to unwind via the drive shaft 13 and the unwinding sleeve 11. After unwinding is completed, the unwinding sleeve 11 is deflated. The second drive member 26 drives the loading plate 21 to move towards the first end via the slider 24 and the connecting rod 22, while simultaneously pushing the spare pole rolls 100 on the bearing shaft 14 to move towards the first end, so that the spare pole rolls 100 near the first end overcome the resistance of the springback assembly 4 and move onto the unwinding sleeve 11. Then, the second drive member 26 drives the loading plate 21 to move towards the second end to return it to its original position. Then, under the action of the springback assembly 4, the other spare pole rolls 100 on the bearing shaft 14 are separated from the pole rolls 100 on the unwinding sleeve 11. Then, the unwinding sleeve 11 is inflated, and the first drive member 3 drives the pole rolls 100 on the unwinding sleeve 11 to unwind through the drive shaft 13 and the unwinding sleeve 11. This process continues until all pole rolls 100 are unwound.

[0062] The springback assembly 4 can drive the pole roll 100 on the bearing shaft 14 to move to the second end of the bearing shaft 14, that is, to separate the unwinding pole roll 100 on the unwinding sleeve 11 from the spare pole roll 100 on the bearing shaft 14. During the rotation of the unwinding sleeve 11, the unwinding sleeve 11 drives the pole roll 100 on the unwinding sleeve 11 to unwind. Since the pole roll 100 on the unwinding sleeve 11 and the pole roll 100 on the bearing shaft 14 are separated, the pole roll 100 on the unwinding sleeve 11 cannot drive the pole roll 100 on the bearing shaft 14 to rotate due to friction, thus ensuring the unwinding quality and also ensuring that the pole roll 100 on the bearing shaft 14 is not damaged due to rotation.

[0063] The outer diameter of the bearing shaft 14 gradually increases in a stepped manner from the first end to the second end, and the second end is fixed on the fixed seat 15. This allows the first end of the bearing shaft 14 to withstand a large torque without deformation. That is, under the gravity of the pole roll 100 and the unwinding sleeve 11, the bearing shaft 14 will not bend. Moreover, the unwinding sleeve 11 is fitted on the first end of the bearing shaft 14, so that the drive shaft 13 will not bear the gravity of the pole roll 100 and the unwinding sleeve 11. In summary, this effectively ensures the stability of the power transmission of the drive shaft 13, while also ensuring the stability of the rotation of the unwinding sleeve 11, thereby ensuring the stability of unwinding.

[0064] The bearing shaft 14, drive shaft 13 and unwinding sleeve 11 are arranged coaxially, which makes the unwinding device simple and compact in structure and improves the feeding efficiency.

[0065] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A shaft assembly for an unwinding device, characterized in that, include: The bearing shaft (14) is used to carry the pole roll; The unwinding sleeve (11) is rotatably disposed at the first end of the bearing shaft (14); A springback assembly (4) is disposed at the first end of the bearing shaft (14); The feeding assembly (2) can drive the pole roll on the bearing shaft (14) to move across the springback assembly (4) to the unwinding sleeve (11), the springback assembly (4) can drive the pole roll on the bearing shaft (14) to move toward the second end of the bearing shaft (14), and the unwinding sleeve (11) can drive the pole roll on the unwinding sleeve (11) to unwind; The springback assembly (4) includes: Drive block (44); The second power assembly (48) is capable of driving the drive block (44) to pop outward from inside the bearing shaft (14); The side of the drive block (44) near the second end is a first inclined surface, and the side of the drive block (44) near the first end is a second inclined surface. Both the first inclined surface and the second inclined surface are inclined to the side outside the drive block (44). The rebound assembly (4) further includes a first elastic element (47) disposed on the side of the drive block (44) near the first end. The first elastic element (47) can drive the drive block (44) to move toward the second end, so that the drive block (44) drives the pole roll to move toward the second end.

2. The shaft assembly according to claim 1, characterized in that, The rebound assembly (4) includes a sliding base (41) with a sliding groove (45) on the sliding base (41). The drive block (44) is slidably disposed within the sliding groove (45), and the first elastic element (47) and / or the second power assembly (48) are disposed within the sliding groove (45); and / or The rebound assembly (4) further includes a buffer block (46) disposed at the second end of the sliding groove (45).

3. The shaft assembly according to claim 2, characterized in that, The second power assembly (48) includes a second elastic element, the two ends of which act on the drive block (44) and the sliding base (41) respectively.

4. The shaft assembly according to claim 2, characterized in that, The second power assembly (48) includes a magnetic element and an electromagnet, one of which is disposed on the sliding base (41) and the other is disposed on the drive block (44). After the electromagnet is energized, the magnetic element and the electromagnet repel each other, thereby driving the drive block (44) to pop outward from the bearing shaft (14).

5. The shaft assembly according to claim 1, characterized in that, The springback components (4) are multiple and arranged circumferentially along the bearing axis (14); and / or, The springback assembly (4) is not installed above the bearing shaft (14).

6. The shaft assembly according to claim 1, characterized in that, The shaft assembly also includes a drive shaft (13), the bearing shaft (14) is a hollow shaft, the drive shaft (13) is rotatably disposed inside the bearing shaft (14) and connected to the unwinding sleeve (11).

7. An unwinding device, characterized in that, include: The shaft assembly as described in any one of claims 1-6; Fixed seat (15), the second end of the bearing shaft (14) is fixed on the fixed seat (15); The first driving member (3) is connected to the unwinding sleeve (11) and is used to drive the unwinding sleeve (11) to rotate.

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