A winding needle opening and closing support mechanism and winding equipment

Abstract

The present application relates to a winding needle opening and closing support mechanism and a winding device, wherein the winding needle opening and closing support mechanism includes a needle cylinder, which is provided with a support hole; an ejector kit, which is inserted into the needle cylinder through the support hole, and the ejector kit includes an ejector and an elastic sleeve, the elastic sleeve is provided on the ejector, and a clamping gap is left between the inner wall of the elastic sleeve and the circumferential side wall of the ejector; a force-applying structure, which is provided on the needle cylinder, and the force-applying structure includes a force-applying surface, the force-applying surface contacts the outer wall of the elastic sleeve, and applies a radial force to the elastic sleeve to reduce the clamping gap. The winding needle opening and closing support mechanism of the present application can, on the one hand, use the ejector to separate the split winding needle, and on the other hand, can radially support the outer side surface of the split winding needle through the elastic sleeve. Therefore, the axial force applied by the ejector to the split winding needle is not easy to cause the split winding needle to bend and deform under the action of the elastic sleeve, thereby extending the service life of the split winding needle.

Description

Technical Field

[0001] The present application relates to the technical field of new energy battery manufacturing equipment, and in particular to a winding needle opening and closing support mechanism and a winding device. Background Art

[0002] Currently, battery cell forming methods mainly include winding and lamination. During the battery cell winding process, the ends of the electrode and diaphragm are connected to the winding needle, and the electrode and diaphragm are wound into shape as the winding needle rotates.

[0003] After the battery cell is wound, the winding needle needs to be removed from the cell. Because the electrode and diaphragm are tightly wrapped around the winding needle, the core is easily pulled out when the needle is removed. The winding needle is also prone to scratching the diaphragm, affecting the processing quality of the battery cell.

[0004] In the related art, refer to Figure 1 As shown, the winding needles are provided separately, and an ejector pin 201 is inserted into the free ends of the two split winding needles 6 to separate the two split winding needles 6. When the diaphragm and electrode are wound around the two split winding needles 6, a gap is always left between the two split winding needles 6. After the winding is completed, the ejector pin 201 is pulled out from between the two split winding needles 6. At this time, the two split winding needles 6 move closer, leaving a gap for needle removal, so that the winding needles can be easily pulled out of the wound battery cell.

[0005] However, when the ejector pin is inserted into the two split winding needles to separate the two split winding needles, the circumferential outer side surface of the ejector pin contacts the split winding needles. The ejector pin not only separates the two split winding needles, but also applies axial force to the split winding needles. After the split winding needles are subjected to the axial force, they are prone to bending and deformation. Summary of the Invention

[0006] The embodiments of the present application provide a winding needle opening and closing support mechanism and a winding device to solve the technical problem in the related art that the axial force applied by the ejector pin to the split winding needle easily causes the split winding needle to bend and deform.

[0007] In a first aspect, a needle winding opening and closing support mechanism is provided, comprising:

[0008] A syringe having a support hole;

[0009] An ejector kit is inserted into the needle cylinder through the support hole, and comprises an ejector and an elastic sleeve. The elastic sleeve is sleeved on the ejector, and a clamping gap is left between the inner wall of the elastic sleeve and the circumferential side wall of the ejector;

[0010] A force-applying structure is provided on the syringe, and includes a force-applying surface. The force-applying surface contacts the outer wall of the elastic sleeve and applies radial force to the elastic sleeve to reduce the clamping gap.

[0011] In some embodiments, the force-applying structure includes a shrinkage hole, which is coaxial with and connected to the support hole. The force-applying surface includes a hole wall of the shrinkage hole, and the diameter of the shrinkage hole gradually decreases along the needle insertion direction of the ejector kit.

[0012] In some embodiments, the ejector kit further includes a connecting sleeve, which is fixedly mounted on the ejector, and one end of the connecting sleeve is connected to the elastic sleeve.

[0013] In some embodiments, the force-applying structure includes a flared hole, which is coaxial with and connected to the support hole. The force-applying surface includes a hole wall of the flared hole, and the diameter of the flared hole gradually increases along the needle insertion direction of the ejector kit.

[0014] In some embodiments, the force-applying structure further includes a force-applying driving member connected to the elastic sleeve to enable the elastic sleeve to move along its length direction.

[0015] In some embodiments, the front end of the elastic sleeve is configured in a trumpet shape, and the front end of the elastic sleeve contacts the force-applying surface.

[0016] In some embodiments, the force applying structure includes:

[0017] at least two clamping members, the elastic sleeve is located between the plurality of clamping members, and the force-applying surface includes the clamping surfaces of the clamping members;

[0018] An opening and closing mechanism is drivingly connected to the plurality of clamping members to drive the plurality of clamping members to move closer to or away from each other.

[0019] In some embodiments, the ejector pin includes a needle body and a needle head, the needle head is inserted into the needle body, the connecting sleeve is fixedly mounted on the needle body, and the connecting sleeve and the needle head are connected via a connecting pin.

[0020] In some embodiments, the ejector kit further includes a pre-tightening elastic member, and two ends of the pre-tightening elastic member are respectively connected to the needle body and the needle head.

[0021] The beneficial effects of the technical solution provided by this application include:

[0022] The embodiment of the present application provides a winding needle opening and closing support mechanism. Due to the arrangement of the elastic sleeve and the force-applying structure, the elastic sleeve can be retracted under the action of the force-applying structure to cover and clamp the split winding needle, thereby limiting the deformation of the split winding needle. During winding, after the split winding needle extends to the support hole, the ejector assembly moves along the needle threading direction, so that the split winding needle is placed in the clamping gap. On the one hand, the ejector is inserted between the two split winding needles to separate the two split winding needles. On the other hand, the inner diameter of the elastic sleeve gradually shrinks and is tightened on the circumferential side of the split winding needle, thereby clamping the split winding needle in the clamping gap. Among them, the force-applying structure causes the elastic sleeve to retract and radially support the outer side of the split winding needle, thereby limiting the bending deformation of the split winding needle. Therefore, the axial force applied by the ejector to the split winding needle is not easy to cause the split winding needle to bend and deform, thereby extending the service life of the split winding needle.

[0023] In a second aspect, a winding device is provided, comprising the winding needle opening and closing support mechanism as described above.

[0024] Another embodiment of the present application provides a winding device, which is used to include the above-mentioned winding needle opening and closing support mechanism. Therefore, the beneficial effects of the winding device are consistent with the beneficial effects of the above-mentioned winding needle opening and closing support mechanism, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 Figures are related to the technology;

[0027] Figure 2 A schematic diagram of the winding needle opening and closing support mechanism provided in an embodiment of the present application;

[0028] Figure 3 A schematic diagram of the connection between the syringe and the mounting sleeve provided in an embodiment of the present application;

[0029] Figure 4 A schematic diagram of an ejector pin kit provided in an embodiment of the present application;

[0030] Figure 5 The elastic sleeve provided in the embodiment of the present application is a schematic diagram.

[0031] In the figure: 1. Syringe; 101. Support hole; 2. Ejector kit; 201. Ejector; 2011. Needle body; 2012. Needle head; 2013. Needle handle; 202. Elastic sleeve; 202a. Notch groove; 203. Connecting sleeve; 204. Connecting pin; 205. Pre-tightening elastic member; 3. Elastic member; 4. Mounting sleeve; 5. Cover body; 6. Split winding needle; 7. Force-applying structure; a. Clamping gap. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] The present application provides a winding needle opening and closing support mechanism and winding equipment. The winding needle opening and closing support mechanism utilizes a push pin to separate the split winding needles while also providing radial support to the outer side surfaces of the split winding needles via an elastic sleeve. Thus, the axial force applied by the push pin to the split winding needles is less likely to cause bending or deformation of the split winding needles due to the elastic sleeve. This application addresses the technical problem in related art where the axial force applied by the push pin to the split winding needles easily causes bending or deformation of the split winding needles.

[0034] Reference Figures 2 to 4 A winding needle opening and closing support mechanism includes a needle cylinder 1 and an ejector kit 2. The needle cylinder 1 is provided with a support hole 101 that is aligned with its axis and is provided through the needle cylinder 1, and the ejector kit 2 is inserted into the needle cylinder 1 through the support hole 101. The support hole 101 is for the split winding needle 6 to be inserted. During winding, the two split winding needles 6 extend into the support hole 101, and then the ejector kit 2 moves in the needle threading direction to separate the two split winding needles 6 and radially support the split winding needles 6, wherein the needle threading direction is the direction of the ejector kit 2 toward the split winding needle 6.

[0035] Reference Figures 2 to 4 The ejector assembly 2 includes an ejector pin 201 and an elastic sleeve 202. The elastic sleeve 202 is mounted on the ejector pin 201, and a clamping gap a is left between the inner wall of the elastic sleeve 202 and the circumferential side wall of the ejector pin 201. When the ejector assembly 2 moves in the needle threading direction, the split winding needle 6 is placed in the clamping gap a. The ejector pin 201 is inserted between the two split winding needles 6 to separate them, and the elastic sleeve 202 is simultaneously mounted on the split winding needles 6.

[0036] Reference Figures 2 to 4Specifically, the winding needle opening and closing support mechanism also includes a force-applying structure 7, which is arranged on the needle cylinder 1. The force-applying structure 7 includes a force-applying surface, which contacts the outer wall of the elastic sleeve 202, and the force-applying structure 7 applies radial force to the elastic sleeve 202 through the force-applying surface, so that the elastic sleeve 202 shrinks inward and presses the two split winding needles 6 to support the two split winding needles 6.

[0037] Reference Figures 2 to 4 In this embodiment, the force-applying structure 7 includes a shrinkage hole, which is opened in the syringe 1 and is coaxial with and connected to the support hole 101. Preferably, the shrinkage hole is located at the front end of the support hole 101, and the split winding needle 6 extends to the support hole 101 after passing through the shrinkage hole.

[0038] Reference Figures 2 to 4 Furthermore, the diameter of the shrinking hole gradually decreases along the needle threading direction. Preferably, the smallest diameter of the shrinking hole is located at the front end surface of the needle cylinder 1. The split winding needle 6 is inserted into the shrinking hole, and the outer wall of the elastic sleeve 202 contacts the hole wall of the shrinking hole. As the elastic sleeve 202 moves along the needle threading direction, the elastic sleeve 202 is squeezed by the hole wall of the shrinking hole, and the inner diameter of the elastic sleeve 202 becomes smaller, so that the split winding needle 6 is tightly wrapped in the elastic sleeve 202, and the split winding needle 6 is radially supported, and the split winding needle 6 is limited from bending and deformation. Therefore, when the ejector pin 201 is inserted between the two split winding needles 6, the axial force applied to the split winding needle 6 is not likely to cause deformation of the split winding needle 6.

[0039] Reference Figures 2 to 4 Furthermore, in this embodiment, the elastic sleeve 202 is connected to the ejector pin 201 and moves along with the ejector pin 201. When the ejector pin 201 inserts the needle, the elastic sleeve 202 simultaneously retracts, eliminating the need for a drive mechanism to move the elastic sleeve 202. Specifically, the ejector pin assembly 2 also includes a connecting sleeve 203, which is mounted on the ejector pin 201 and welded to the elastic sleeve 202 at one end. Therefore, moving the ejector pin 201 also moves both the connecting sleeve 203 and the elastic sleeve 202. In other embodiments, a direct linear drive mechanism can also be used to drive the elastic sleeve 202 within the necking hole.

[0040] In some embodiments, the force-applying structure 7 includes a flaring hole, which is opened in the syringe 1 and is coaxial with and connected to the support hole 101. Preferably, the flaring hole is located at the front end of the support hole 101, and the split winding needle 6 extends to the support hole 101 after passing through the shrinking hole.

[0041] Furthermore, the diameter of the expanded hole gradually increases along the needle threading direction. Preferably, the largest diameter of the expanded hole is located at the front end face of the needle cylinder 1. The split winding needle 6 is inserted into the expanded hole, and the outer wall of the elastic sleeve 202 contacts the hole wall of the expanded hole. As the elastic sleeve 202 moves away from the needle threading direction, the elastic sleeve 202 is squeezed by the hole wall of the expanded hole, and the elastic sleeve 202 shrinks and its inner diameter becomes smaller, so that the split winding needle 6 is tightly wrapped in the elastic sleeve 202, and the split winding needle 6 is radially supported, and the split winding needle 6 is limited from bending and deformation. Therefore, when the ejector pin 201 is inserted between the two split winding needles 6, the axial force applied to the split winding needle 6 is not likely to cause deformation of the split winding needle 6.

[0042] Specifically, when the force-applying structure 7 is a flared hole, the force-applying structure 7 further includes a force-applying driving member, which is drivingly connected to the elastic sleeve 202 to drive the elastic sleeve 202 to move along its length. The force-applying driving member may include a linear motor, a cylinder, or a screw mechanism.

[0043] In some embodiments, the force-applying structure 7 includes an opening and closing mechanism and at least two clamping members, and the clamping surface of the clamping member is the force-applying surface. The elastic sleeve 202 is located between the multiple clamping members, and the opening and closing mechanism drives the multiple clamping members to move closer to or away from each other. When the multiple clamping members move closer to each other, the elastic sleeve 202 is squeezed to cause the elastic sleeve 202 to retract. The opening and closing mechanism includes a cylinder, a screw mechanism or a linear motor corresponding to the number of clamping members to respectively drive the multiple clamping members to move. Preferably, the clamping members include two, and the opening and closing mechanism includes a bidirectional screw mechanism or a clamping claw cylinder to drive the two clamping members to move. The clamping member is in the shape of an arc plate, and the clamping surface fits with the outer side surface of the elastic sleeve 202.

[0044] Reference Figure 2 、 Figure 4 and Figure 5 In many embodiments, further, the front end of the elastic sleeve 202 is configured in a bell-mouth shape, and the front end of the elastic sleeve 202 contacts the hole wall of the shrink hole. The front end of the elastic sleeve 202 here refers to the end of the elastic sleeve 202 facing the split winding needle 6.

[0045] This arrangement, with its bell-shaped opening, facilitates the insertion of the split winding needle 6 into the clamping gap a. Furthermore, a gap is left between the inner wall of the bell-shaped opening of the elastic sleeve 202 and the split winding needle 6. When the bell-shaped opening of the elastic sleeve 202 is squeezed inward by the wall of the shrinking hole, the bell-shaped opening of the elastic sleeve 202 contracts, driving the contact area between the elastic sleeve 202 and the split winding needle 6 inward to tightly enclose the split winding needle 6. After the elastic sleeve 202 compresses the split winding needle 6, the bell-shaped opening of the elastic sleeve 202 can further deform as the elastic sleeve 202 further moves in the needle threading direction. Therefore, the bell-shaped opening of the elastic sleeve 202 provides a deformation margin, thereby avoiding the possibility of crushing the split winding needle 6.

[0046] Reference Figure 2 、 Figure 4 and Figure 5 Specifically, the sidewall of the elastic sleeve 202 is provided with a notch 202a. The notch 202a extends along the length of the elastic sleeve 202 and is open at the front end of the elastic sleeve 202. In this embodiment, two notches 202a are provided. As the elastic sleeve 202 is squeezed by the shrinking hole, the width of the notch 202a decreases to support deformation of the elastic sleeve 202.

[0047] Reference Figures 2 to 4 The ejector pin 201 includes a needle body 2011 and a needle head 2012. The needle head 2012 is inserted into the needle body 2011 so that the needle head 2012 and the needle body 2011 are detachably connected. A connecting sleeve 203 is inserted into the needle body 2011, and a portion of the needle head 2012 is also located within the connecting sleeve 203. The connecting sleeve 203 and the needle body 2011 are fixed by bolts or welding. The needle head 2012 and the connecting sleeve 203 are connected by a connecting pin 204. Specifically, a pin hole for the connecting pin 204 to pass through is formed in the side wall of the connecting sleeve 203. The connecting pin 204 is inserted through the connecting sleeve 203 and the needle head 2012 in the radial direction of the needle head 2012. In this way, the needle head 2012 and the needle body 2011 are connected through the connecting sleeve 203 and the connecting pin 204, and the relative position of the needle head 2012 and the needle body 2011 is maintained.

[0048] Reference Figures 2 to 4 The needle 2012 is used to be inserted between the two split winding needles 6. The needle 2012 is repeatedly inserted between the two split winding needles 6. The wear of the needle 2012 is greater than the wear of the needle body 2011. Therefore, the needle 2012 and the needle body 2011 are designed to be separated, so that the needle 2012 can be replaced separately.

[0049] Reference Figures 2 to 4 Furthermore, the ejector kit 2 also includes a pre-tightening elastic member 205, the two ends of which are respectively connected to the needle head 2012 and the needle body 2011. In this embodiment, the pre-tightening elastic member 205 includes a spring, and a step groove is provided on the circumferential side of the needle head 2012. The spring is sleeved on the needle head 2012, and one end of the spring abuts against the bottom of the step groove, and the other end of the spring abuts against one end face of the needle body 2011. The spring is in a compressed state. The elastic force of the spring applies a pre-tightening force to the needle head 2012 away from the needle body 2011, and the connecting pin 204 is also pushed by the pre-tightening force and has a tendency to move away from the needle body 2011. Therefore, the connecting pin 204 abuts against the hole wall of the pin hole, making the connection between the connecting sleeve 203, the needle body 2011 and the needle head 2012 more stable.

[0050] Reference Figures 2 to 4Furthermore, the front end of the needle 2012 is conical, and the front end of the needle 2012 is the end of the needle 2012 facing the split winding needle 6, and the front end of the needle 2012 extends between the two split winding needles 6. Since the front end of the needle 2012 is conical, the needle 2012 is easier to be inserted between the two split winding needles 6 to separate the two split winding needles 6.

[0051] Reference Figures 2 to 4 The needle winding support mechanism further includes a mounting sleeve 4, through which the needle cylinder 1 is inserted and rotatably connected via a bearing. When the split needle winding 6 rotates, it drives the ejector assembly 2 and the needle cylinder 1 to rotate together, thus minimizing wear on the split needle winding 6.

[0052] Reference Figures 2 to 4 Furthermore, the needle winding opening and closing support mechanism also includes two cover bodies 5, which are respectively located at the two ends of the syringe 1 and are fixed to the syringe 1 and the mounting sleeve 4 by bolts to cover the connection structure between the syringe 1 and the mounting sleeve 4.

[0053] Reference Figures 2 to 4 The needle winding opening and closing support mechanism also includes an elastic member 3, the two ends of which are respectively connected to the ejector kit 2 and the needle cylinder 1. The elastic force of the elastic member 3 causes the ejector kit 2 to move along the needle threading direction to realize automatic needle threading.

[0054] Reference Figures 2 to 4 Specifically, the elastic member 3 includes a spring, which is sleeved on the connecting sleeve 203, and one end of the spring abuts against the connecting pin 204, and the other end of the spring abuts against the cover 5. The elastic force of the spring pushes the connecting pin 204 to push the entire ejector assembly 2 in the needle threading direction.

[0055] Reference Figures 2 to 4 The ejector pin 201 further includes a handle 2013, which is annular and located outside the support hole 101. Specifically, a portion of the needle body 2011 extends through the cover 5 and out of the needle barrel 1, with the handle 2013 securely mounted on the needle body 2011. After winding is complete, the ejector pin 201 needs to be removed from between the two separate winding pins 6. The handle 2013 facilitates the application of force to the ejector pin 201, thereby pulling it out from between the two separate winding pins 6.

[0056] It is understood that during winding, the split winding needle 6 is inserted into the support hole 101, and the elastic force of the elastic member 3 drives the ejector assembly 2 to move in the needle threading direction, so that the ejector 201 is inserted between the two split winding needles 6 and separates the two split winding needles 6. At the same time, the inner diameter of the elastic sleeve 202 is reduced under the pressure of the hole wall of the shrinking hole and tightly wraps around the split winding needle 6, thereby providing radial support for the split winding needle 6 and limiting the bending and deformation of the split winding needle 6. After winding is completed, the needle handle 2013 is pulled to drive the ejector assembly 2 away from the split winding needle 6, and the ejector 201 can be pulled out from between the two split winding needles 6. At the same time, the inner diameter of the elastic sleeve 202 gradually increases, making it easier to detach from the split winding needle 6.

[0057] The embodiment of the present application provides a winding needle opening and closing support mechanism. Due to the arrangement of the elastic sleeve 202 and the force-applying structure 7, the elastic sleeve 202 can be retracted under the action of the force-applying structure 7 to cover and clamp the split winding needle 6, thereby limiting the deformation of the split winding needle 6. During winding, after the split winding needle 6 extends to the support hole 101, the ejector kit 2 moves along the needle threading direction, so that the split winding needle 6 is placed in the clamping gap a. On the one hand, the ejector 201 is inserted between the two split winding needles 6 to separate the two split winding needles 6. On the other hand, the inner diameter of the elastic sleeve 202 gradually shrinks and is tightened to the circumferential side of the split winding needle 6, so that the split winding needle 6 is clamped in the clamping gap a. Among them, the force-applying structure 7 causes the elastic sleeve 202 to retract and radially support the outer side surface of the split winding needle 6, thereby limiting the bending and deformation of the split winding needle 6. Therefore, the axial force applied to the split winding needle 6 by the ejector pin 201 is not likely to cause the split winding needle 6 to bend and deform, thereby extending the service life of the split winding needle 6.

[0058] Another embodiment of the present application provides a winding device, including the winding needle opening and closing support mechanism as described above.

[0059] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0060] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0061] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A needle winding opening and closing support mechanism, characterized in that: It includes: The needle cylinder is provided with a support hole for inserting two separate winding needles; An ejector pin set is inserted into the needle cylinder through the support hole, and the ejector pin set includes an ejector pin and an elastic sleeve. The elastic sleeve is sleeved on the ejector pin, and a clamping gap is left between the inner wall of the elastic sleeve and the circumferential side wall of the ejector pin; the split winding pin is inserted into the clamping gap, and the ejector pin is inserted between the two split winding pins; A force-applying structure is provided on the syringe, and includes a force-applying surface, which contacts the outer wall of the elastic sleeve and applies radial force to the elastic sleeve to reduce the clamping gap. The force-applying structure includes a shrinking hole, which is located at the front end of the supporting hole, and the split winding needle extends to the supporting hole after passing through the shrinking hole. The front end of the elastic sleeve is arranged in a trumpet shape, and the front end of the elastic sleeve contacts the hole wall of the shrinking hole. A gap is left between the inner wall of the trumpet mouth of the elastic sleeve and the split winding needle. When the trumpet mouth of the elastic sleeve is squeezed inward by the hole wall of the shrinking hole, the trumpet mouth of the elastic sleeve shrinks and drives the position where the elastic sleeve contacts the split winding needle to shrink, so as to tightly cover the split winding needle.

2. The winding needle opening and closing support mechanism according to claim 1, characterized in that: The force-applying structure includes a shrinking hole, which is coaxial with and connected to the supporting hole. The force-applying surface includes a hole wall of the shrinking hole. The diameter of the shrinking hole gradually decreases along the needle insertion direction of the ejector kit.

3. The needle opening and closing support mechanism according to claim 2, characterized in that: The ejector kit further includes a connecting sleeve, which is fixedly sleeved on the ejector, and one end of the connecting sleeve is connected to the elastic sleeve.

4. The winding needle opening and closing support mechanism according to claim 1, characterized in that: The force-applying structure includes a flared hole, which is coaxial with and connected to the support hole. The force-applying surface includes a hole wall of the flared hole. The diameter of the flared hole gradually increases along the needle insertion direction of the ejector kit.

5. The winding needle opening and closing support mechanism according to claim 4, characterized in that: The force-applying structure further includes a force-applying driving member connected to the elastic sleeve to enable the elastic sleeve to move along its length direction.

6. The winding needle opening and closing support mechanism according to claim 2 or 4, characterized in that: The front end of the elastic sleeve is arranged in a trumpet shape, and the front end of the elastic sleeve contacts the force-applying surface.

7. The winding needle opening and closing support mechanism according to claim 1, characterized in that: The force applying structure comprises: at least two clamping members, the elastic sleeve is located between the plurality of clamping members, and the force-applying surface includes the clamping surfaces of the clamping members; An opening and closing mechanism is drivingly connected to the plurality of clamping members to drive the plurality of clamping members to move closer to or away from each other.

8. The winding needle opening and closing support mechanism according to claim 3, characterized in that: The ejector pin comprises a needle body and a needle head, the needle head is inserted into the needle body, the connecting sleeve is fixedly sleeved on the needle body, and the connecting sleeve and the needle head are connected via a connecting pin.

9. The winding needle opening and closing support mechanism according to claim 8, characterized in that: The ejector kit further includes a pre-tightening elastic member, and two ends of the pre-tightening elastic member are respectively connected to the needle body and the needle head.

10. A winding device, characterized in that: It comprises the winding needle opening and closing support mechanism according to any one of claims 1 to 9.

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