Core-pulling prevention winding needle
By designing anti-core rolling needles, using the driving components and jet head technology of the arc-shaped needle plate, the problem of easy core pulling after winding is completed is solved, the stability and quality of the core are improved, and the downtime in production is reduced.
Patent Information
- Application Number
- CN202421730720.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-19
AI Technical Summary
After winding is completed, the core is prone to core extraction, resulting in damage to the inner ring of the core and affecting the core quality.
An anti-extraction core rolling needle is designed, including at least two arc pin plates. The arc pin plates are driven to move the arc pin plates closer or away from each other through the driving assembly, reducing the spacing between the needle plate and the center of the needle body, and using the smooth transition design of the arc pin plate and the jet head to promote the separation of the core and the needle plate, reducing friction.
Effectively prevent core pulling, improve the stability and quality of core pulling, reduce production downtime, and improve production efficiency.
Smart Images
Figure CN223133648U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery production equipment, and more specifically, to an anti-core-pulling winding needle. Background Art
[0002] A winding machine is a device used to prepare coils or cores, and it usually consists of a winding needle, a reel, and a control system. The winding needle is a key component of the winding machine. When the winding machine prepares a core, the winding needle usually holds the coil, and then the winding needle rotates to wind the coil around it to gradually form a cylindrical core. During this process, the innermost circle of the core contacts the outer wall of the winding needle. However, after winding is completed, when the core is taken out of the winding needle, it is often affected by the frictional force between the winding needle and the core. This frictional force may cause the inner circle of the core to be taken out together with the winding needle, and this phenomenon is called core pulling. As a result, the inner circle of the core is damaged, resulting in poor quality of the core. Summary of the Utility Model
[0003] The utility model provides an anti-core-pulling winding needle to solve the problem that core pulling is likely to occur when the core is taken out after winding is completed.
[0004] To achieve the above object, the technical solution provided by the utility model is as follows:
[0005] An anti-core-pulling winding needle includes a needle body,
[0006] The needle body includes at least two arc-shaped needle plates, the arc-shaped needle plates are located on the outer side of the needle body, and the outer surface of the arc-shaped needle plate is smoothly transitioned along its circumferential direction;
[0007] Each arc-shaped needle plate is connected to a driving assembly;
[0008] The driving assembly includes a driving part and several connecting rods;
[0009] One end of the connecting rod is connected to the arc-shaped needle plate, and the other end is connected to the driving part;
[0010] The driving part drives each arc-shaped needle plate to approach or move away from each other through the connecting rod.
[0011] In this solution, after the winding needle rotates and the coil is wound around it to form a core, the driving part drives each arc-shaped needle plate to approach each other through the connecting rod, reducing the distance from the arc-shaped needle plate to the center of the needle body, so that the inner surface of the innermost layer of the core is separated from the outer surfaces of the four arc-shaped needle plates, thereby playing a role in preventing core pulling. After the core is taken out, the arc-shaped needle plates move away from each other and return to the initial state to prepare for the next core winding.
[0012] As a preferred solution, a plurality of arc segments protrude from the outer surface of the arc-shaped needle plate, and the adjacent arc segments are arranged at intervals, and the arc segments extend axially toward the arc-shaped needle plate. The arc-shaped needle plate is provided with a point-segment arc segment structure on the outer surface, which can reduce the contact area between the outer surface of the arc-shaped needle plate and the core, thereby reducing the effect of friction and further reducing the risk of core extraction of the core.
[0013] As a preferred solution, it further includes a positioning disk provided at one end of the needle body. A chute is opened on the positioning disk, and a slider is arranged in the chute. The connecting rod is connected to the arc-shaped needle plate through the slider; when the arc-shaped needle plates approach or move away from each other, the slider reciprocates in the chute. The number of the chutes corresponds to the number of the arc-shaped needle plates, and the chutes extend radially along the positioning disk. The chute can provide guidance and limit for the movement of the slider.
[0014] As a preferred solution, the driving assembly further includes a rotating shaft; one end of the rotating shaft is connected to the driving part, and the other end passes through the positioning disk and extends to the inner side of the needle body, and a fixed turntable is sleeved and connected on the rotating shaft located on the inner side of the needle body; the connecting rod is connected to the driving part through the fixed turntable. A fixed turntable can connect each connecting rod at the same time. When the rotating shaft rotates, the fixed turntable can drive the connecting rods simultaneously and synchronously, so that the connecting rods drive the arc-shaped needle plates to move, ensuring that the arc-shaped needle plates maintain synchronous and coordinated actions.
[0015] As a preferred solution, the connecting rod is bent, and the bending direction thereof is the same as the rotating direction of the rotating shaft when the driving part drives the arc-shaped needle plates to approach each other. The rotating direction of the connecting rod and the force receiving direction of the connecting rod pulling the slider are both towards one side, making it easier for the connecting rod to drive the slider to move.
[0016] As a preferred solution, a baffle is arranged on the inner side of each arc-shaped needle plate, and an elastic member is arranged between the baffle and the arc-shaped needle plate; the baffle is connected to the positioning disk, and the baffle is used to limit the arc-shaped needle plate. The baffle can effectively limit the movement range when the arc-shaped needle plates approach each other. At the same time, combined with the setting of the chute, the movement range when the arc-shaped needle plates move away from each other can be effectively limited, ensuring that the arc-shaped needle plates move within a specific range.
[0017] As a preferred solution, the baffle is located at the junction of the adjacent arc-shaped needle plates, and a conical block is connected to one side of the baffle, and the conical block extends to the gap at the junction of the adjacent arc-shaped needle plates. The conical block is fixed on the outer surface of the baffle, which can play a role in guiding the movement of the arc-shaped needle plate and prevent the movement track of the arc-shaped needle plate from deviating.
[0018] As a preferred solution, the edge side surface of the adjacent arc-shaped needle plates is a cut surface, and the adjacent cut surfaces form a notch, and the size of the notch gradually increases in the direction close to the center of the needle body; the conical block extends into the notch, and the side surface of the conical block cooperates with the cut surface. The inwardly expanding notch can reduce the contact area between adjacent arc-shaped needle plates, thereby reducing the friction and wear of the arc-shaped needle plates during movement.
[0019] As a preferred solution, a plurality of air jet heads are installed in the conical block, and the jet direction of the air jet heads faces the outside of the needle body. The gas in the air jet heads is ejected onto the inner surface of the innermost layer of the core, so as to form an air film between the inner surface of the core and the arc-shaped needle plates, so as to promote the separation between the core and the arc-shaped needle plates. Description of the Drawings
[0020] Figure 1 Schematic diagram of the overall structure of the coiling needle;
[0021] Figure 2 Schematic diagram of the setting of the sliding groove and the sliding block on the coiling needle;
[0022] Figure 3 Schematic diagram of the connection state between the rotating shaft and the driving assembly;
[0023] Figure 4 Schematic diagram of the internal structure of the coiling needle;
[0024] Figure 5 Schematic diagram of the baffle structure.
[0025] Label Description:
[0026] 1. Needle body; 101. Arc-shaped needle plate; 102. Arc segment; 2. Positioning disk; 3. Sliding groove; 4. Sliding block; 5. Driving assembly; 501. Box body; 502. Driving part; 503. Rotating shaft; 504. Fixed rotating disk; 505. Connecting rod; 6. Baffle; 7. Elastic member; 8. Cut surface; 9. Conical block; 10. Air jet head. Detailed Embodiment
[0027] To further understand the content of the present invention, the present invention will be described in detail in combination with the drawings and embodiments.
[0028] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions that the present invention can be implemented. Therefore, they do not have technical substance significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that the technical content disclosed by the present invention can cover.
[0029] In this application, the orientation or positional relationship indicated by terms such as "left", "right", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation. Moreover, in addition to being used to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.
[0030] The anti-core-pulling winding needle provided in this embodiment is rotatably installed on the large winding tower plate. When the winding needle rotates, the coil material is wound thereon to form a coil core.
[0031] In this embodiment, the "inner" and "outer" described are relative to the center of the winding needle. The side close to the center of the winding needle is "inner", and the side opposite to the center of the winding needle is "outer".
[0032] Combined Figure 1 and Figure 2 As shown, an anti-core-pulling winding needle in this embodiment includes a needle body 1. The needle body 1 includes four arc-shaped needle plates 101. The arc-shaped needle plates 101 are located on the outer side of the needle body 1. The four arc-shaped needle plates 101 enclose to form the needle body 1, and at a certain moment, the four arc-shaped needle plates 101 have a common center of circle.
[0033] The outer surface of the arc-shaped needle plate 101 is smoothly transitioned along its circumference. The smooth transition method can be through an arc line transition. Specifically, the cross-section of the arc-shaped needle plate 101 along its radial direction is arc-shaped. In other cases, the smooth transition method can also be formed by sequentially connecting multiple straight line segments, as long as there are no obvious protruding edges on the outer surface of the formed arc-shaped needle plate 101.
[0034] In this embodiment, each arc-shaped needle plate 101 is connected to the driving assembly 5. The driving assembly 5 includes a driving part 502 and four connecting rods 505. The number of the connecting rods 505 corresponds to the number of the arc-shaped needle plates 101. One end of each connecting rod 505 is connected to an arc-shaped needle plate 101, and the other end is connected to the driving part 502; the driving part 502 drives each arc-shaped needle plate 101 to approach or move away from each other through the connecting rods 505.
[0035] When the winding needle rotates and the coil material is wound around it to form a core, the driving part 502 drives each arc-shaped needle plate 101 to approach each other, reducing the distance between the arc-shaped needle plate 101 and the center of the needle body 1, separating the inner surface of the innermost core from the outer surfaces of the four arc-shaped needle plates 101, so as to play a role in preventing core pulling. This helps to improve the stability of the core winding needle system and the winding quality; in addition, avoiding core pulling can also reduce the downtime during the production process and improve production efficiency.
[0036] In this embodiment, the driving part 502 uses a driving motor. When the output shaft of the driving motor rotates, it drives the connecting rod 505 to pull each arc-shaped needle plate 101, so that the arc-shaped needle plates 101 approach each other. After the core is pulled out, the driving motor returns to its original position, and the arc-shaped needle plates 101 move away from each other and return to the initial state to prepare for the next core winding.
[0037] Combined with Figure 4 As shown, several arc segments 102 protrude from the outer surface of the arc-shaped needle plate 101, and adjacent arc segments 102 are arranged at intervals, and the arc segments 102 extend along the axial direction of the arc-shaped needle plate 101. By arranging several arc segments 102 at intervals, the arc-shaped needle plate 101 is provided with a point-segment arc segment structure on the outer surface, which can reduce the contact area between the outer surface of the arc-shaped needle plate 101 and the core, thereby reducing the effect of friction and further reducing the risk of core pulling of the core. And the centers of the arc-shaped needle plates 101 coincide with each other in the initial state. By combining multiple arc-shaped needle plates 101 to form the needle body 1, this design can clamp the coil material more evenly and can better maintain the roundness and stability of the core, thereby improving the quality and appearance of the core.
[0038] Combined with Figure 2 and Figure 3 As shown, the core-pulling prevention winding needle further includes a positioning disk 2 arranged at one end of the needle body 1, and the positioning disk 2 is a disk-shaped structure. A chute 3 is opened on the positioning disk 2, and the number of chutes 3 corresponds to the number of arc-shaped needle plates 101, and the chute 3 extends along the radial direction of the positioning disk 2. A slider 4 is arranged in the chute 3, and the connecting rod 505 is connected to the arc-shaped needle plate 101 through the slider 4, that is, one end of the arc-shaped needle plate 101 is connected to the slider 4, and the slider 4 is simultaneously connected to one end of the connecting rod 505. One end of the connecting rod 505 is rotatably connected to the slider 4. In this embodiment, one end of the connecting rod 505 is hinged to the slider 4. In other cases, the two can also be connected in other ways, as long as the connecting rod 505 and the slider 4 can be rotatably connected. When the arc-shaped needle plates 101 approach or move away from each other, the slider 4 reciprocates in the chute 3. The chute 3 can guide the movement of the slider 4, and the maximum movement range of the slider 4 is the length of the chute 3. The chute 3 can also provide a limit for the movement of the slider 4.
[0039] In this embodiment, four sliding grooves 3 are provided, which are arranged at equal angles around the central axis of the positioning disk 2. The sliding groove 3 is a long strip structure, and the center point of the positioning disk 2 is located on the extension line of the central axis of the sliding groove 3. A slider 4 is slidably arranged inside the sliding groove 3, and the slider 4 is fixedly connected to the arc-shaped needle plate 101. When the connecting rod 505 drives the slider 4 to slide inside the sliding groove 3, the distance between the four sliders 4 from the center point of the positioning disk 2 is changed. After the core winding is completed, by reducing the distance between the four sliders 4 from the center point of the positioning disk 2, the arc-shaped needle plates 101 are made to approach each other, and the distance between the arc-shaped needle plate 101 and the center of the needle body 1 is reduced.
[0040] The driving assembly 5 is arranged on the existing large winding tower plate. The driving part 502 in the driving assembly 5 drives the four sliders 4 to move synchronously closer to or away from each other through the connecting rod 505, ensuring that they maintain synchronous and coordinated movements during the winding process; this helps to ensure the clamping stability of the core winding and the uniformity of winding, and improves the quality of the core winding.
[0041] Combined with Figure 4 As shown, the driving assembly 5 further includes a rotating shaft 503 and a box body 501. The driving part 502 is arranged inside the box body 501. One end of the rotating shaft 503 is connected to the output shaft of the driving part 502, and the other end passes through the positioning disk 2 and extends to the inside of the needle body 1. A fixed turntable 504 is sleeved and connected to the rotating shaft 503 located inside the needle body 1. The connecting rod 505 is connected to the driving part 502 through the fixed turntable 504.
[0042] Specifically, a through hole is provided at the center position of the positioning disk 2, and the rotating shaft 503 passes through the through hole and is fixedly connected with a fixed turntable 504 thereon. In this embodiment, the fixed turntable 504 is a square fixed block, and each side of the square fixed block is correspondingly connected to one end of each connecting rod 505. One end of the connecting rod 505 is hinged to the square fixed block, so that the connecting rod 505 is rotatably connected to the square fixed block. The rotation of the rotating shaft 503 is caused by the output shaft of the driving motor inside the box body 501. The rotating shaft 503 drives the fixed turntable 504 and the connecting rod 505 to move in conjunction, and the connecting rod 505 drives the slider 4 to slide inside the sliding groove 3. The driving motor transmits power to the fixed turntable 504 and the connecting rod 505 through the rotating shaft 503, thereby driving the slider 4 to slide. This transmission method can effectively transmit the driving force to each target position and provide stable and efficient power output.
[0043] Furthermore, the connecting rod 505 is bent, and the bending direction is the same as the rotation direction of the rotating shaft 503 when the driving part 502 drives the arc-shaped needle plates 101 to approach each other. Specifically, see Figure 4In this case, the driving part 502 drives the rotating shaft 503 to rotate in the A direction. At the same time, the fixed turntable 504 rotates synchronously and drives the connecting rod 505 to pull the slider 4 to slide, and the slider 4 drives the arc-shaped needle plates 101 to approach each other. In order to make the rotation direction of the connecting rod 505 and the force direction of the connecting rod 505 pulling the slider 4 both face one side, for example Figure 4 In this case, both the rotation direction and the force direction face the left side, so that the bending direction of the connecting rod 505 is consistent with the rotation direction of the rotating shaft 503 when the driving part 502 drives the arc-shaped needle plates 101 to approach each other.
[0044] See Figure 4 As shown in, a baffle 6 is arranged on the inner side of each arc-shaped needle plate 101. The baffle 6 is located at the junction of adjacent arc-shaped needle plates 101. One end of the baffle 6 is fixedly connected to the positioning plate 2, and the baffle 6 is used to limit the arc-shaped needle plates 101. The outer surface of the baffle 6 is an arc structure and can cooperate with the arc-shaped needle plates 101.
[0045] Specifically, the baffle 6 is located at the gap at the junction between two adjacent arc-shaped needle plates 101 and within the inner area of the two arc-shaped needle plates 101. The setting of the baffle 6 can effectively limit the movement range when the arc-shaped needle plates 101 approach each other. At the same time, combined with the setting of the chute 3, it can effectively limit the movement range when the arc-shaped needle plates 101 move away from each other, ensuring that the arc-shaped needle plates 101 move within a specific range, thus guaranteeing the stable operation and precise positioning of the core winding needle system. By limiting the movement range, accidents during the movement of the arc-shaped needle plates 101 can be avoided, such as damage caused by excessive mutual separation or approach, increasing the safety and reliability of operating the system.
[0046] An elastic member 7 is arranged between the baffle 6 and the arc-shaped needle plate 101. Specifically, the elastic member 7 is connected to the baffle 6 and is arranged at equal intervals along the length direction of the baffle 6. In this embodiment, the elastic member 7 is a spring, but in other embodiments, other elastic components can also be used, such as sponge or rubber, etc. The setting of the elastic member 7 can absorb the impact force during the movement of the baffle 6, reduce the impact and vibration generated when the baffle 6 contacts the arc-shaped needle plate 101, contribute to protecting the structural integrity of the equipment, reduce the impact load on the baffle 6, and improve the stability and durability of the system.
[0047] The edge side surfaces of adjacent arc-shaped needle plates 101 are cut surfaces 8, and adjacent cut surfaces 8 form a notch. The size of the notch gradually increases in the direction towards the center of the needle body 1, forming an inward-expanded notch. The inward-expanded notch can reduce the contact area between adjacent arc-shaped needle plates 101, thereby reducing the friction and wear during the movement of the arc-shaped needle plates 101, contributing to extending the service life of the arc-shaped needle plates 101, reducing the maintenance cost, and improving the reliability of the equipment.
[0048] One side of the baffle 6 is connected to the conical block 9, and the conical block 9 extends to the gap where adjacent arc-shaped needle plates 101 meet. Specifically, the conical block 9 extends into the notch, and the side surface of the conical block 9 cooperates with the cut surface 8. The conical block 9 is fixed on the outer surface of the baffle 6, which can play a role in guiding the movement of the arc-shaped needle plate 101 and prevent the movement track of the arc-shaped needle plate 101 from shifting.
[0049] As Figure 5 shown, two columns of elastic members 7 are arranged on each baffle 6, respectively located on both sides of the conical block 9, so as to play a buffering role for the adjacent arc-shaped needle plates 101.
[0050] In this embodiment, a number of jet nozzles 10 are installed in the conical block 9, and the jet direction of the jet nozzles 10 faces the outside of the needle body 1. Combining Figure 5 shown, two mounting holes are provided on the outside of the conical block 9 on the baffle 6, and jet nozzles 10 are provided inside the mounting holes. The jet nozzles 10 are connected to an existing external air supply device. The high-pressure gas inside the air supply device enters the jet nozzles 10 through the air supply pipeline on the air supply device and is sprayed onto the inner surface of the innermost layer of the core, so as to promote the separation between the core and the arc-shaped needle plate 101, thus playing a role in preventing core pulling. In addition, the plane of the air outlet of the jet nozzle 10 is lower than the outlet plane of the mounting hole, so that the jet nozzle 10 is placed inside the mounting hole. During the process of the arc-shaped needle plates 101 approaching each other, the air outlet of the jet nozzle 10 is at a lower position, avoiding the jet nozzle 10 protruding during the movement of the arc-shaped needle plates 101 and damaging the core, thus playing a role in protecting the core.
[0051] During the use process, the winding tower large plate drives rotation, so that the needle body 1 rotates accordingly and winds the coil material, and a core is formed on the needle body 1. At this time, the innermost circle of the core contacts the outer wall of the arc-shaped needle plate 101.
[0052] A controller is provided on the positioning disk 2, and the driving end of the controller is connected to the driving part 502. The controller is prior art under the mature background and will not be elaborated here. Through the controller, the driving part 502 is controlled, and the power supply of the driving motor in the box body 501 is turned on, so that the rotating shaft 503 rotates. The rotating shaft 503 drives the fixed turntable 504 and the connecting rod 505 to move in conjunction, and makes the slider 4 slide inside the chute 3. The driving motor transmits power to the fixed turntable 504 and the connecting rod 505 through the rotating shaft 503, thereby driving the slider 4 to slide inside the chute 3 towards the center of the positioning disk 2. The slider 4 drives the arc-shaped needle plates 101 to approach each other, reducing the distance between the arc-shaped needle plates 101 and the center of the needle body 1, and separating the inner surface of the innermost layer of the core from the outer surfaces of the four arc-shaped needle plates 101, thus playing a role in preventing core pulling.
[0053] On the other hand, the controller also controls an external gas supply device and turns on the power supply of the gas supply device. The gas inside the gas supply device enters the jet head 10 through the gas supply pipeline on the gas supply device and is sprayed onto the inner surface of the innermost core, so as to cause separation between the core and the arc-shaped needle plate 101, thereby playing a further role in preventing core pulling.
[0054] In this embodiment, an electrostatic removal device for removing static electricity is further provided on the needle body 1. Through the electrostatic removal device, the static electricity on the surface of the coil can be effectively removed, the adhesion between the coils can be reduced, and the smooth operation of the coils during the winding process can be ensured.
[0055] Moreover, the inner diameter of the winding needle can be adjusted by the arc-shaped needle plate 101. On the one hand, it prevents the core from being pulled out, and on the other hand, it has strong adaptability and meets the requirements of cores of different models.
[0056] In this embodiment, the drive motor serving as the drive part 502 drives the arc-shaped needle plate 101 to move in sequence through the rotating shaft 503, the fixed turntable 504, the connecting rod 505 and the slider 4, reducing the distance between the arc-shaped needle plate 101 and the center of the needle body 1, so that the inner surface of the innermost core is separated from the outer surface of the arc-shaped needle plate 101, thereby playing a role in preventing core pulling. A gas supply device is arranged to be connected to the jet head 10, and the gas enters the jet head 10 through the gas supply pipeline on the gas supply device and is sprayed onto the inner surface of the innermost core, so as to cause separation between the core and the arc-shaped needle plate, thereby playing a role in preventing core pulling.
[0057] In this embodiment, four arc-shaped needle plates 101 are provided, and the four arc-shaped needle plates 101 form a cylindrical needle body 1 structure, and a cylindrical core is mainly formed during winding. However, in other cases, the arc-shaped needle plates 101 can also be provided in other numbers, such as two or three, etc.
[0058] In some cases, the winding needle structure in this embodiment is also applicable to a square winding core. In this case, two arc-shaped needle plates 101 are respectively located at the arc segments on both sides of the core, and other structures of the winding needle are changed adaptively.
[0059] The terms "installation", "setting", "providing", "connection" referred to here should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is an internal connection between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.
[0060] The above has schematically described the present utility model and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the creation of the present utility model, design similar structural modes and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present utility model.
Claims
1. A core-pulling prevention ejector pin, characterized in that: It includes a needle body (1). The needle body (1) includes at least two arc-shaped needle plates (101). The arc-shaped needle plates (101) are located on the outer side of the needle body (1), and the outer surface of the arc-shaped needle plates (101) is smoothly transitioned along its circumferential direction. Each of the arc-shaped needle plates (101) is connected to a driving assembly (5). The driving assembly (5) includes a driving part (502) and a number of connecting rods (505). One end of the connecting rod (505) is connected to the arc-shaped needle plate (101), and the other end is connected to the driving part (502). The driving part (502) drives each of the arc-shaped needle plates (101) to approach or move away from each other through the connecting rod (505).
2. The core-pulling prevention coiling needle according to claim 1, characterized in that: The outer surface of the arc-shaped needle plate (101) protrudes to form a number of arc segments (102). The adjacent arc segments (102) are arranged at intervals, and the arc segments (102) extend along the axial direction of the arc-shaped needle plate (101).
3. The core-pulling prevention coiling needle according to claim 1, characterized in that: It further includes a positioning disk (2) provided at one end of the needle body (1). A sliding groove (3) is opened on the positioning disk (2), and a sliding block (4) is arranged in the sliding groove (3). The connecting rod (505) is connected to the arc-shaped needle plate (101) through the sliding block (4). When the arc-shaped needle plates (101) approach or move away from each other, the sliding block (4) reciprocates in the sliding groove (3).
4. The core-pulling prevention coiling needle according to claim 3, wherein: The number of the sliding grooves (3) corresponds to the number of the arc-shaped needle plates (101), and the sliding grooves (3) extend along the radial direction of the positioning disk (2).
5. The core-pulling prevention coiling needle according to claim 3, wherein: The driving assembly (5) further includes a rotating shaft (503). One end of the rotating shaft (503) is connected to the driving part (502), and the other end passes through the positioning disk (2) and extends to the inner side of the needle body (1). A fixed rotating disk (504) is sleeved and connected on the rotating shaft (503) located on the inner side of the needle body (1). The connecting rod (505) is connected to the driving part (502) through the fixed rotating disk (504).
6. The core-pulling prevention coiling needle according to any one of claims 1-5, characterized in that: The connecting rod (505) is bent, and the bending direction thereof is consistent with the rotating direction of the rotating shaft (503) when the driving part (502) drives the arc-shaped needle plates (101) to approach each other.
7. The core-pulling prevention coiling needle according to any one of claims 3-5, characterized in that: A baffle (6) is arranged on the inner side of each of the arc-shaped needle plates (101), and an elastic member (7) is arranged between the baffle (6) and the arc-shaped needle plate (101). The baffle (6) is connected to the positioning disk (2), and the baffle (6) is used to limit the arc-shaped needle plate (101).
8. The core-pulling prevention coiling needle according to claim 7, characterized in that: The baffle (6) is located at the junction of the adjacent arc-shaped needle plates (101), and a conical block (9) is connected to one side of the baffle (6). The conical block (9) extends to the gap at the junction of the adjacent arc-shaped needle plates (101).
9. The core-pulling prevention coiling needle according to claim 8, wherein: The edge side surfaces of the adjacent arc-shaped needle plates (101) are cut surfaces (8), and the adjacent cut surfaces (8) form a notch. The size of the notch gradually increases in the direction approaching the center of the needle body (1). The conical block (9) extends into the notch, and the side surface of the conical block (9) cooperates with the cut surface (8).
10. The core-pulling prevention coiling needle according to claim 8, characterized in that: A number of jet heads (10) are installed in the conical block (9), and the jetting direction of the jet heads (10) faces the outside of the needle body (1).