A winding needle and a winding device

Abstract

The application provides a winding needle and a winding device, comprising: a seat body; an expansion assembly connected with the seat body and capable of realizing radial expansion and contraction through inflation and deflation; an outer needle body connected with the outer periphery of the expansion assembly and capable of expanding and contracting along the radial direction with the expansion assembly; a limiting assembly connected with the seat body and capable of axially displacing relative to the seat body, and the limiting assembly is arranged on the outer periphery of the expansion assembly and capable of limiting the expansion distance of the outer needle body through the axial displacement of the limiting assembly relative to the seat body. In this way, the radial expansion and contraction of the outer needle body is realized through the inflation and deflation of the expansion assembly, so as to realize the adjustment of the outer circumference of the winding needle. Meanwhile, the different expansion distances of the expansion assembly are limited through the different axial positions of the limiting assembly relative to the expansion assembly, so that the external thrust is not needed to maintain the outer circumference of the winding needle during winding, and the structure is simple and convenient to operate.

Description

Technical Field

[0001] This application relates to the field of battery cell processing technology, specifically to a winding needle and winding device. Background Technology

[0002] In the lithium battery production process, a winding machine uses a needle to wind the separator and positive and negative electrode sheets to form the battery cell. The outer circumference of the winding needle is related to the alignment of the electrode tabs and the size of the battery cell, so the outer circumference of the winding needle directly affects the quality of the battery cell. Currently, the outer circumference of the winding needle is generally changed by attaching Teflon to its outer surface, which is inconvenient to adjust.

[0003] Currently, existing automatically adjustable needle winding systems adjust the inner and outer needles simultaneously using wedges or sliding grooves. This adjustment is typically driven by a linear motion mechanism either inside or outside the needle. When the drive motor is installed inside the needle, it rotates along with the needle, requiring a conductive slip ring for power supply and signal transmission, resulting in a complex structure. When external thrust is used to adjust the needle's circumference, the structure is also complex, demanding high precision in components, and requires a continuous external thrust to maintain the needle's circumference. Summary of the Invention

[0004] In view of this, this application provides a needle winding device with a simple structure, which does not require external pushing force to maintain the outer circumference of the needle during winding.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A coiled needle, comprising:

[0007] seat body;

[0008] An expansion assembly, connected to the base, is capable of radial expansion and contraction through inflation and deflation.

[0009] The outer needle body is connected to the outer periphery of the expansion assembly and can expand and contract radially with the expansion assembly;

[0010] A limiting component is connected to the base and is capable of axial displacement relative to the base. The limiting component is disposed on the outer periphery of the expansion component and is capable of limiting the outward expansion distance of the outer needle body through the axial displacement of the limiting component relative to the base body.

[0011] Optionally, the limiting component includes:

[0012] A limiting member, connected to the base and capable of axial displacement relative to the base, is located on the outer periphery of the expansion assembly;

[0013] A wedge mechanism is disposed between the limiting member and the expansion assembly. When the expansion assembly is in an inflated state, the limiting member and the expansion assembly are connected through the wedge mechanism, and the wedge mechanism is self-locking.

[0014] Optionally, an elastic element is provided between the limiting member and the seat, the elastic element being able to drive the limiting member to move relative to the seat along a first axial direction; and the inclined surface of the wedge block in the wedge mechanism that contacts the slider gradually moves away from the expansion component along the first axial direction.

[0015] Optionally, one end of the limiting member is connected to the seat body, and the other end is provided with a driving component. The driving component can drive the limiting member to move relative to the seat body along a second axis, where the first axis is opposite to the second axis.

[0016] Optionally, the expansion component includes:

[0017] Multiple airbag seats are distributed circumferentially, all connected to the seat body, and can move closer to or further away from it radially;

[0018] Multiple airbags are respectively disposed on one side of the multiple airbag seats that are close to each other;

[0019] When the multiple airbags are inflated, they can clamp the diaphragm and cause the multiple airbag seats to move radially away from each other.

[0020] Optionally, the airbag seat is provided with an airbag groove for accommodating the airbag body.

[0021] Optionally, the airbag seat is provided with a guide hole, and a ball bearing guide sleeve is provided inside the guide hole. Adjacent airbag seats are connected by a guide rod that slides with the ball bearing guide sleeve, so that the plurality of airbag seats can move closer or further apart radially.

[0022] Optionally, the seat body is provided with a connecting plate, which is located between the two airbag seats and connected to the guide rod.

[0023] Optionally, the seat body is provided with a connecting sleeve, which is sleeved on the outside of the limiting member and slides in cooperation with the limiting member.

[0024] A winding device includes a winding needle, said winding needle being the winding needle described in any of the preceding claims.

[0025] The winding needle and winding device provided in this application, in the working state, during winding, causes the limiting component to be axially displaced relative to the base body, so that the relative position of the limiting component and the expansion component is a preset relative position, so that the expansion component is in an inflated state, the expansion component expands radially outward, and at the same time drives the outer needle body to expand radially outward. When the expansion component reaches the preset outward expansion distance corresponding to the preset relative position, the limiting component limits the outward expansion of the expansion component, so as to restrict the expansion component and the outer needle body from continuing to expand radially outward, thereby keeping the winding needle with a preset outer circumference for winding; in the non-working state or during unloading, the expansion component is in a deflated state, the expansion component contracts radially, and at the same time drives the outer needle body to contract radially, that is, the outer circumference of the winding needle is in the minimum state, so that the outer diameter formed by the outer needle body is smaller than the inner diameter of the battery cell after winding, so that the battery cell can be unloaded from the winding needle. This design allows for radial expansion and contraction of the outer needle body by inflating and deflating the expansion component, thereby adjusting the outer circumference of the coiled needle. At the same time, the different axial positions of the limiting component relative to the expansion component limit the different outward expansion distances of the expansion component. No external thrust is required to maintain the outer circumference of the coiled needle during winding. The structure is simple and easy to operate. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0027] Figure 1 Cross-sectional view of a coiled needle as shown in some embodiments;

[0028] Figure 2 Here are some structural diagrams illustrating the self-locking structure of the wedge mechanism in various embodiments;

[0029] Figure 3 The diagram shows the separate structure of the wedge mechanism in some embodiments.

[0030] 1. Push block; 2. Wedge block; 3. Airbag body; 4. Airbag seat; 5. Outer needle body; 6. Limiting component; 7. Ball bearing guide sleeve; 8. Guide rod; 9. Elastic component; 10. Seat body; 11. Power structure; 12. Inclined surface; 13. Slider. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0032] like Figures 1-3 As shown, this application embodiment provides a coiling needle, including a base 10, an expansion assembly, an outer needle body 5, and a limiting assembly.

[0033] The base 10 serves as the overall load-bearing structure and is used to install the winding needle. By rotating the base 10, the entire winding needle can be rotated to complete the winding of the diaphragm and the positive and negative electrode sheets.

[0034] The expansion assembly is connected to the base 10 so that the base 10 can drive the expansion assembly to rotate. Specifically, one axial end of the expansion assembly is connected to the base 10. Moreover, by inflating and deflating the expansion assembly, the radial expansion and contraction of the expansion assembly can be achieved, thereby changing the outer perimeter of the expansion assembly.

[0035] The expansion assembly can be configured as multiple airbag assemblies, arranged circumferentially and centrally symmetrically. By inflating the airbags within these assemblies, adjacent airbags compress each other, causing the assemblies to move radially away from each other, thus achieving radial expansion. This allows the needle to wind in a manner that clamps the diaphragm. Alternatively, the expansion assembly can be a single airbag assembly. Inflating the airbag at the center of the assembly causes radial expansion, increasing the outer circumference of the assembly and allowing the needle to wind without clamping the diaphragm. It is understood that since the expansion assembly rotates with the base 10, its internal airbags also rotate synchronously. To ensure a stable air supply, an external air source can be connected to the internal airbags via a rotary joint.

[0036] The outer needle body 5 is connected to the outer periphery of the expansion assembly. Through the radial expansion and contraction of the expansion assembly, the outer needle body 5 is driven to expand and contract radially. Specifically, the outer needle body 5 has multiple parts distributed in the circumferential direction. By expanding and contracting radially in all multiple parts, the outer periphery of the coiled needle can be adjusted.

[0037] A limiting component is disposed on the outer periphery of the expansion component and is connected to the base 10, so that the base 10 can drive the limiting component to rotate together with the expansion component. Furthermore, the limiting component can be axially displaced relative to the base 10, allowing it to move axially relative to the expansion component. By adjusting the relative position of the limiting component on the outer periphery of the expansion component, the outward expansion distance of the expansion component (i.e., the outward expansion distance of the outer needle body 5) is adjusted, thereby achieving the adjustment and limiting of the outer circumference of the coiled needle. Specifically, different relative positions of the limiting component and the expansion component correspond to different outward expansion distances of the expansion component (i.e., different outward expansion distances of the outer needle body 5).

[0038] It should be noted that, since the coil needle is a cylindrical structure, the above descriptions of "axial", "radial", and "circumferential" are all based on the axial, radial, and circumferential directions of the coil needle, that is, the base 10, the expansion assembly, and the outer needle body 5 are coaxially arranged, and the axial direction is the axial direction of the coil needle after assembly.

[0039] In the working state, during winding, the limiting component is displaced axially relative to the base 10 so that the relative position between the limiting component and the expansion component is a preset relative position, and the expansion component is in an inflated state. The expansion component expands radially outward, and at the same time drives the outer needle body 5 to expand radially outward. When the expansion component reaches the preset outward expansion distance corresponding to the preset relative position, the limiting component limits the outward expansion of the expansion component to restrict the expansion component and the outer needle body 5 from continuing to expand radially outward, thereby keeping the winding needle at a preset outer circumference during winding. In the non-working state or during unloading, the expansion component is in a deflated state, and the expansion component contracts radially, and at the same time drives the outer needle body 5 to contract radially, that is, the outer circumference of the winding needle is at its minimum state, thereby making the outer diameter of the outer needle body 5 smaller than the inner diameter of the battery cell after winding, so that the battery cell can be unloaded from the winding needle.

[0040] With this configuration, the radial expansion and contraction of the outer needle body 5 is achieved by inflating and deflating the expansion component, thereby adjusting the outer circumference of the coiled needle. At the same time, the different axial positions of the limiting component relative to the expansion component limit the different outward expansion distances of the expansion component. No external thrust is required to maintain the outer circumference of the coiled needle during winding. The structure is simple and easy to operate.

[0041] In some preferred embodiments, the limiting assembly includes a limiting element 6 and a wedge mechanism.

[0042] The limiting member 6 is connected to the base 10 and is axially displaceable relative to the base 10, so that the limiting member 6 can be axially displaced relative to the expansion assembly. Moreover, the limiting member 6 is disposed on the outer periphery of the expansion assembly to limit the outward expansion distance of the expansion assembly. Specifically, the limiting member 6 can be configured as a push rod or a sleeve.

[0043] The wedge mechanism is set between the limiting member 6 and the expansion component. When the expansion component is in the inflated state, the expansion component gradually approaches the limiting member 6 until the expansion component and the limiting member 6 come into contact and abut against each other through the wedge mechanism. At the same time, the wedge mechanism is in a self-locking state so that the limiting member 6 can limit the outward expansion distance of the expansion component.

[0044] like Figure 2-3 As shown, the wedge mechanism includes a wedge 2 and a slider 13. The wedge 2 is disposed on the outer wall of the expansion assembly, and the slider 13 is disposed on the inner wall of the limiting member 6 (the slider 13 is...). Figure 2 (The portion of the middle limiting member protruding towards the expansion component) When the expansion component and the limiting member 6 are in contact and abutting each other through the wedge mechanism, the wedge 2 and the slider 13 are in contact through the inclined surface 12. For example, the wedge is provided with an inclined surface 12, and the slider 13 can slide or lock on the inclined surface 12. Since the slider 13 is located at different positions on the inclined surface 12 of the wedge 2, the distance formed between the expansion component and the limiting member 6 is different, so as to limit the different outward expansion distance of the expansion component. When the wedge mechanism is in the self-locking state, the slider will not slide along the inclined surface of the wedge 2, that is, the component of the expansion force of the expansion component on the inclined surface is less than or equal to the friction force between the slider and the wedge 2 on the inclined surface, which is also equivalent to the helix angle of the inclined surface of the wedge mechanism being less than or equal to the friction angle.

[0045] Thus, by using the inclined surface on the wedge mechanism, the different radial outward expansion distances of the expansion assembly can be limited by the different axial positions of the limiting member 6 relative to the expansion assembly. For example, as the inclined surface of the wedge block in contact with the slider in the wedge mechanism gradually moves away from the expansion assembly along the first axial direction, the radial outward expansion distance of the expansion assembly gradually decreases as the limiting member 6 displaces along the first axial direction. Moreover, the self-locking of the wedge mechanism can limit the relative displacement of the limiting member 6 and the expansion assembly, thereby maintaining the dimensional stability of the outer circumference of the coiled needle. The structure is simple, stable, and reliable.

[0046] Of course, in other solutions, the limiting component may include a stop block located on the outer periphery of the expansion component, the stop block having an inclined surface, and the expansion distance of the expansion component can be adjusted by adjusting the position of the expansion component on the inclined surface of the stop block; or the limiting component may include a limiting ring surrounding the outer periphery of the expansion component, and the expansion distance of the expansion component can be adjusted by adjusting the diameter of the limiting ring.

[0047] Furthermore, an elastic element 9 is provided between the limiting member 6 and the seat 10. The elastic element 9 can drive the limiting member 6 to move relative to the seat 10 along the first axial direction, so that the limiting member 6 can apply a force along the first axial direction to the wedge mechanism. Here, for example... Figure 2-3As shown, in the wedge mechanism, the inclined surface 12 where the wedge block 2 contacts the slider 13 gradually moves away from the expansion component along the first axial direction. This is equivalent to the inclined surface 12 extending along the first axial direction while expanding radially outward, so that the elastic force generated by the elastic element 9 along the first axial direction is converted into a radial force through the wedge mechanism that is opposite to the expansion force of the expansion component. In this way, the elastic force of the elastic element 9 and the expansion force of the expansion component work together to make it easier to achieve the self-locking of the wedge mechanism and avoid the accident problem caused by the imbalance between the friction force of the wedge mechanism itself and the expansion force of the expansion component.

[0048] Here, due to the self-locking of the wedge mechanism, and simultaneously subjected to the elastic force of the elastic element 9 and the expansion force of the expansion assembly, the axial component of the expansion force of the expansion assembly, converted by the wedge mechanism, applied to the limiting element 6 is less than the elastic force applied by the elastic element 9 to the limiting element 6, so as to prevent the expansion force of the expansion assembly from causing the limiting element 6 to displace along the second axial direction; the radial component of the elastic force of the elastic element 9, converted by the wedge mechanism, applied to the expansion assembly is less than the expansion force of the expansion assembly, so as to prevent the elastic force of the elastic element 9 from causing the expansion assembly to displace along the radial direction.

[0049] Specifically, the elastic element 9 is configured as a compression spring. One end of the compression spring is connected to the end of the limiting element 6, and the other end is connected to the seat 10. The elastic force of the compression spring can drive the limiting element 6 to move along the first axial direction, that is, to move away from the seat 10.

[0050] In this solution, the limiting component can be axially displaced relative to the seat 10 either manually or automatically. The following description uses the automatic method.

[0051] The limiting member 6 extends along the axial direction. One end of the limiting member 6 is connected to the base 10, and the other end is provided with a driving component. The driving component can drive the limiting member 6 to move relative to the base 10 along the second axial direction. In the working state, during winding, the driving component pushes the limiting member 6 to move relative to the seat 10 along the second axis until the relative position of the limiting member 6 and the expansion component is at the preset relative position. At the same time, it overcomes the elastic force applied by the elastic member 9 to the limiting member 6, causing the elastic member 9 to deform and accumulate potential energy. Then, the expansion component is inflated and expands radially outward, driving the outer needle body 5 to expand radially outward. When the expansion component reaches the preset outward expansion distance corresponding to the preset relative position, the limiting member 6 and the expansion component make contact and limit each other through the self-locking wedge mechanism to restrict the outer needle body 5 from continuing to expand radially outward, thereby keeping the winding needle at the preset outer circumference. In the non-working state or during unloading, the expansion component is deflated, the expansion force of the expansion component disappears, the elastic member 9 recovers its deformation, and pushes the limiting member 6 to move along the first axis. At the same time, due to the action of the wedge mechanism, the elastic force of the elastic member 9 is converted into a radial component force applied to the expansion component through the wedge mechanism, which will push the expansion component to contract, thereby achieving rapid unloading.

[0052] Specifically, the drive assembly includes a push block 1 and a power structure 11. The push block 1 is located at one end of the limiting member 6 and can move closer to or further away from the limiting member 6 along the axial direction under the drive of the power structure 11. When the push block 1 moves along the second axial direction, it can push the limiting member 6 to move relative to the seat 10 along the second axial direction. The power structure 11 can be configured as a cylinder or a motor and a lead screw nut to facilitate stepless adjustment of the displacement of the limiting member 6.

[0053] It should be noted that the first axis and the second axis mentioned in the text are both axes of the coiling needle, the only difference being that they are opposite in direction.

[0054] In some preferred embodiments, the expansion assembly includes an airbag seat 4 and an airbag body 3. Multiple airbag seats 4 are distributed circumferentially, such as two, three or four. The following description uses two airbag seats.

[0055] Both airbag seats 4 are connected to the seat body 10 and can be radially displaced relative to the seat body 10 to bring the two airbag seats 4 closer to or further away from each other. Specifically, the center of symmetry of the airbag seats 4 is the axis of the coiling needle to ensure the stability of the structure. Correspondingly, two airbag bodies 3 are provided, respectively disposed on the adjacent side of the two airbag seats 4, so that the two airbag seats 4 are located on both sides of the two airbag bodies 3.

[0056] When the expansion assembly is in the working state, it is equivalent to the two air bladders 3 being inflated. The two air bladders 3 inflate and expand. First, the two air bladders 3 approach each other until they touch, so that the two air bladders 3 can clamp the diaphragm (or the positive and negative electrode plates), thereby ensuring the stability of the diaphragm and the positive and negative electrode plates when the winding needle is wound. Then, the two air bladders 3 push the two air bladder seats 4 to move away from each other radially, thereby forming the expansion of the expansion assembly to achieve the adjustment of the outer circumference of the winding needle.

[0057] Thus, during winding, the membrane is accommodated by the gap formed between the two airbag seats 4, and the membrane is clamped by the inflation of the two airbag bodies 3, which can achieve a stable connection between the membrane and the winding needle, ensuring the neatness and consistency of the winding.

[0058] Specifically, an airbag groove is provided on the airbag seat 4, and the airbag body 3 is placed in the airbag groove, which is beneficial to the protection of the airbag body 3. Moreover, the airbag body 3 is first inflated in the airbag groove and then expanded to the outside of the airbag groove, which is beneficial to improving the stress stability of the airbag seat 4.

[0059] like Figure 1As shown, each of the two airbag seats 4 has a guide hole, with one guide hole for each airbag seat 4 and extending in the same radial direction. A ball bearing guide sleeve 7 is installed within each guide hole, and the same guide rod 8 is slidably fitted within each of the two ball bearing guide sleeves 7, allowing the two airbag seats 4 to be connected via the guide rod 8. Due to the sliding fit between the guide rod 8 and the ball bearing guide sleeve 7, the two airbag seats 4 can be moved radially closer or further apart. This arrangement ensures a stable and reliable fit between the guide rod 8 and the ball bearing guide sleeve 7, with low resistance, which helps improve structural reliability.

[0060] Specifically, the guide rod 8 and the ball bearing guide sleeve 7 are configured in such a way that at least two are provided axially on the two airbag seats 4, which can prevent the two airbag seats 4 from being misaligned.

[0061] The seat 10 is provided with a connecting plate, which is located between the two airbag seats 4 and connected to the guide rod 8 to form a connection between the seat 10 and the airbag seats 4. This can prevent the axial displacement of the airbag seats 4 relative to the seat 10 and improve the limiting accuracy between the limiting component and the expansion component.

[0062] In addition, a connecting sleeve is provided on the base 10. The connecting sleeve is sleeved on the outside of the limiting member 6 so that the connecting sleeve and the limiting member 6 can slide together. In this way, the connecting sleeve can achieve radial limiting of the limiting member 6, avoid the limiting member 6 from displacing radially relative to the base 10, and improve the limiting accuracy between the limiting component and the expansion component.

[0063] Specifically, when one end of the limiting member 6 is set in the form of a sleeve, the outer wall of the limiting member 6 slides in conjunction with the inner wall of the connecting sleeve; when one end of the limiting member 6 is set in the form of a push rod, the limiting member 6 slides in the groove of the inner wall of the connecting sleeve.

[0064] This application provides a winding device including a winding needle, which is the winding needle described in the above embodiments.

[0065] With this configuration, the radial expansion and contraction of the outer needle body 5 is achieved by inflating and deflating the expansion component, thereby adjusting the outer circumference of the coiled needle. At the same time, the different axial positions of the limiting component relative to the expansion component limit the different outward expansion distances of the expansion component. No external thrust is required to maintain the outer circumference of the coiled needle during winding. The structure is simple and easy to operate.

[0066] Furthermore, for other beneficial effects of this winding device, please refer to the above description of the winding needle, which will not be repeated here.

[0067] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0068] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0069] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0070] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0071] It should be understood that the qualifying terms “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0072] The above description has been given for illustrative and descriptive purposes. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A type of coiled needle, characterized in that, include: seat body; An expansion assembly, connected to the base, is capable of radial expansion and contraction through inflation and deflation. The outer needle body is connected to the outer periphery of the expansion assembly and can expand and contract radially with the expansion assembly; A limiting component is connected to the base and is axially displaceable relative to the base. The limiting component is disposed on the outer periphery of the expansion component and is able to limit the outward expansion distance of the outer needle body by means of the axial displacement of the limiting component relative to the base body. The limiting component includes a limiting member and a wedge mechanism. The limiting member is connected to the base and can be displaced axially relative to the base, and is located on the outer periphery of the expansion component. The wedge mechanism is disposed between the limiting member and the expansion component. When the expansion component is in an inflated state, the limiting member and the expansion component are connected through the wedge mechanism, and the wedge mechanism is self-locking.

2. The coiling needle according to claim 1, characterized in that, An elastic element is provided between the limiting member and the seat body, and the elastic element can drive the limiting member to move relative to the seat body along the first axial direction; and the inclined surface of the wedge block in the wedge mechanism that contacts the slider gradually moves away from the expansion component along the first axial direction.

3. The coiling needle according to claim 2, characterized in that, One end of the limiting member is connected to the base body, and the other end is provided with a driving component. The driving component can drive the limiting member to move relative to the base body along a second axis, where the first axis is opposite to the second axis.

4. The coiling needle according to claim 1, characterized in that, The expansion component includes: Multiple airbag seats are distributed circumferentially, all connected to the seat body, and can move closer to or further away from it radially; Multiple airbags are respectively disposed on one side of the multiple airbag seats that are close to each other; When the plurality of airbags are in an inflated state, they can clamp the diaphragm and cause the plurality of airbag seats to move radially away from each other.

5. The coiling needle according to claim 4, characterized in that, The airbag seat is provided with an airbag groove for accommodating the airbag body.

6. The coiled needle according to claim 4, characterized in that, The airbag seat is provided with a guide hole, and a ball bearing guide sleeve is provided inside the guide hole. Adjacent airbag seats are connected by a guide rod that slides with the ball bearing guide sleeve, so that the multiple airbag seats can move closer or further apart radially.

7. The coiling needle according to claim 6, characterized in that, The seat body is provided with a connecting plate, which is located between the two airbag seats and connected to the guide rod.

8. The coiling needle according to claim 1, characterized in that, The base is provided with a connecting sleeve, which is sleeved on the outside of the limiting member and slides in cooperation with the limiting member.

9. A winding device comprising a winding needle, characterized in that, The coiling needle is the coiling needle as described in any one of claims 1-8.

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