Round winding needle capable of adjusting circumference of winding needle

Abstract

The utility model discloses a circular winding needle with adjustable winding needle perimeter, which comprises an inner clamping needle, a sliding core and blades, the inner clamping needle is slidably arranged at the position of a central shaft of the sliding core, a plurality of lifting grooves are axially formed in the circumferential direction of the sliding core, and the blades are sequentially slidably arranged in the lifting grooves. And the whole sliding track of the blades in the lifting groove is in an inclined state, and the multiple blades synchronously operate along the sliding track, so that the space defined by the multiple blades is increased or decreased. According to the utility model, the perimeter of the winding needle can be adjusted, and the winding requirements of various types of battery cells are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of needle winding, and in particular relates to a circular needle winding with adjustable circumference. Background Art

[0002] There are two main structural designs in lithium-ion battery design at present, one is lamination and the other is winding. Compared with lamination, the winding method has the characteristics of high efficiency and high quality in the production process. In the current winding manufacturing process, there are also a variety of process forms, the difference lies in the shape of the winding machine needle. At present, the winding needle is mainly divided into circular winding needle and elliptical winding needle. Compared with other shapes of winding needles, the circular winding needle has higher production efficiency and higher equipment control accuracy. The circular winding method has gradually become the mainstream process.

[0003] Winding is a manifestation of the collection of defects in the previous process. The existing winding method uses a fixed-circumference winding needle, which cannot be adjusted in size during the production process. It requires extremely high consistency in the production of the previous process. Slight fluctuations will have an irreversible impact on the winding process, resulting in the inability to proceed with the production process and waste of materials, causing economic losses and delaying production progress.

[0004] In addition, at the trial production site, the circumference of the winding needles for different types of battery cells is different, and the existing winding needles cannot adapt to the needs of various types of battery cells. New winding needles have to be redesigned, which has a high economic cost. Utility Model Content

[0005] The purpose of the utility model is to provide a circular winding needle with an adjustable circumference, which is suitable for the winding needs of various types of battery cells.

[0006] The technical solution adopted by the present invention to solve its technical problems is to propose a circular winding needle with adjustable circumference of the winding needle, including an inner clamping needle, a sliding core and blades, the inner clamping needle is slidably arranged at the central axis of the sliding core, and a plurality of lifting grooves are opened axially along the circumference of the sliding core. The plurality of blades are slid in the lifting grooves in sequence, and the sliding tracks of the blades in the lifting grooves are in an inclined state as a whole. The plurality of blades run synchronously along the sliding track, so that the space enclosed by the plurality of blades increases or decreases.

[0007] Furthermore, the inner clamp needle includes a first needle body and a second needle body juxtaposed, and the sliding core includes a first half core and a second half core. The first half core is slidably arranged on the outside of the first needle body, and the second half core is slidably arranged on the outside of the second needle body. When the inner sides of the first needle body and the second needle body are juxtaposed at the center axis of the sliding core, the first half core and the second half core are combined to form a cylinder.

[0008] Furthermore, a plurality of lifting grooves are provided at equal intervals in the circumferential direction of the first half core and the second half core, and the lifting grooves extend axially from the front end surface of the sliding core to the rear end surface.

[0009] Furthermore, it also includes a limit frame, which is covered on the periphery of the sliding core and fixed to the inner clamping needle. The limit frame is provided with a plurality of limit holes corresponding to the plurality of lifting slots provided on the sliding core.

[0010] Furthermore, the limit frame includes a first half frame and a second half frame, the first half frame is fixed to the outside of the first needle body, and the first half core slides between the inside of the first half frame and the outside of the first needle body; the second half frame is fixed to the outside of the second needle body, and the second half core slides between the inside of the second half frame and the outside of the second needle body.

[0011] Furthermore, the front end of the inner clamping needle is provided with a first fixing component and the rear end is provided with a second fixing component, and the first fixing component and the second fixing component extend outside the sliding core; the first fixing component includes a first transverse plate and a second transverse plate, the first transverse plate is used to fix the front end of the first half frame, and the second transverse plate is used to fix the front end of the second half frame; the second fixing component includes a first stop plate and a second stop plate, the first stop plate is used to fix the rear end of the first half frame, and the second stop plate is used to fix the rear end of the second half frame, so that the first half frame and the second half frame are combined to form the limit frame.

[0012] Furthermore, the blade includes an arc-shaped support plate and an elongated radial plate. The upper end of the radial plate is vertically fixed to the inner side of the support plate, and the bottom end of the radial plate passes through the limiting hole and is slidably connected to the lifting slot, so that the support plate is suspended on the outside of the limiting frame; the length of the radial plate is consistent with the length of the limiting hole.

[0013] Furthermore, the depth of the bottom of the lifting groove gradually decreases from the front end to the rear end of the sliding core, the bottom end of the radial plate is inclined, and the inclination degree of the bottom end of the radial plate is the same as the inclination degree of the bottom of the lifting groove. The bottom of the lifting groove is provided with a sliding card slot, and the bottom end of the radial plate is provided with a third sliding rib corresponding to the sliding card slot. The third sliding rib is slidably buckled in the sliding card slot, so that the sliding trajectory of the blade in the lifting groove is inclined.

[0014] Furthermore, the first half frame and the second half frame both include a semicircular ring frame and two inner fixing plates arranged on both side edges of the ring frame, the two inner fixing plates are radially symmetrical, and a plurality of limiting holes are provided on the ring frame at equal intervals along the axial direction; both side edges of the axial section of the first half core and the second half core are provided with accommodating grooves for accommodating the inner fixing plates along the axial direction, and the accommodating grooves are located outside the lifting grooves.

[0015] Furthermore, a sliding shaft is provided on the side of the radial plate, and an inclined sliding groove is provided on the side wall of the lifting groove. The sliding shaft is slidably provided in the sliding groove, so that the sliding track of the blade in the lifting groove is in an inclined state.

[0016] Preferably, the slide groove is inclined upward from the front end to the rear end of the sliding core.

[0017] Preferably, the first needle body and the second needle body are juxtaposed and fixed at the tail end; the two half cores of the sliding core are pushed synchronously, so that the multiple blades are synchronously lifted and lowered in the lifting groove, thereby adjusting the winding circumference of the winding needle

[0018] The beneficial effects of the utility model are:

[0019] The utility model provides a circular winding needle with adjustable circumference. Retractable blades are designed on the winding needle to make the circumference of the winding needle adjustable to meet the winding requirements of different types of battery cells.

[0020] This application adjusts the circumference of the winding needle by synchronously raising and lowering the height of the blades. The winding design of multiple blades is that the overall shape is approximately circular, which does not affect the normal winding requirements of the battery cell.

[0021] The blade telescopic structure of the present invention can control the radius of the winding needle, making it easier to cut the battery cell after winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all. Those skilled in the art can derive other drawings from these drawings without inventive effort.

[0023] Figure 1 This is a structural diagram of a circular winding needle with adjustable winding needle circumference according to an embodiment of the present utility model;

[0024] Figure 2 This is the structural diagram of the inner clamp needle;

[0025] Figure 3 This is a half-side structural diagram of the sliding core;

[0026] Figure 4 It is a half-side structural diagram of the limit frame;

[0027] Figure 5 This is the structural diagram of the blade;

[0028] Figure 6 This is a side view of the deeper end (front end) of the lifting tank;

[0029] Figure 7 It is a side view of the shallower end (rear end) of the lifting tank.

[0030] In the figure: 1. Inner clamping needle; 2. Sliding core; 3. Limiting frame; 4. Blade; 5. Lifting groove; 6. Limiting hole; 11. First sliding rib; 12. Second sliding rib; 13. First fixing assembly; 14. Second fixing assembly; 21. Sliding groove; 22. Accommodating groove; 31. Ring frame; 32. Inner fixing plate; 41. Support plate; 42. Radial plate; 43. Third sliding rib. DETAILED DESCRIPTION

[0031] To more clearly illustrate the embodiments of the present invention and the technical solutions in the prior art, the following describes specific embodiments of the present invention with reference to the accompanying drawings. Obviously, the drawings described below are merely examples of the present invention. A person skilled in the art can, without inventive effort, derive other drawings and other embodiments from these drawings. Furthermore, design orientations only represent relative positional relationships between components, not absolute positional relationships.

[0032] The embodiment of the utility model provides a circular winding needle with adjustable winding needle circumference. Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 It mainly includes an inner clamping needle 1, a sliding core 2 and a blade 4. The inner clamping needle 1 is slidably arranged at the central axis of the sliding core 2. A plurality of lifting grooves 5 are opened axially along the circumference of the sliding core 2. A plurality of blades 4 are slidably arranged in the lifting grooves 5 in sequence, and the sliding track of the blade 4 in the lifting groove 5 is in an inclined state as a whole. The plurality of blades 4 run synchronously along the sliding track, so that the space surrounded by the plurality of blades 4 increases or decreases.

[0033] The plurality of blades 4 are located at the outermost periphery of the winding needle. When the enclosed space increases, the winding circumference increases; when the enclosed space decreases, the winding circumference decreases.

[0034] In the embodiment of the present application, the inner clamping needle 1 is of separate design, including a first needle body and a second needle body placed side by side. The lengths of the two needle bodies can be the same or different, but it should be clear that the lengths of the two needle bodies are the same in the winding part.

[0035] Based on the semi-cylindrical structures of the first needle body and the second needle body, the first needle body and the second needle body can form a cylindrical or quasi-cylindrical coiled needle structure when placed side by side, such as Figure 1 As shown in .

[0036] The increase and decrease of the winding circumference can be implemented separately on the two semi-cylindrical structures, and when adjusting, the two can be adjusted synchronously.

[0037] In an embodiment of the present application, a sliding core 2 is provided on the inner clamping needle 1, and the sliding core 2 is assembled on the inner clamping needle 1 in the form of a sliding buckle, and can slide on it along its direction; a lifting groove 5 is opened on the sliding core 2, and a blade 4 is assembled in the lifting groove 5, and the sliding trajectory of the blade 4 is adjusted to be in an inclined state, so that when the blade 4 slides relative to the sliding core 2, the blade 4 can move away from or close to the central axis of the winding needle, thereby adjusting the radius of the space enclosed by the blade 4, thereby realizing the adjustment of the winding circumference.

[0038] In the embodiment of the present application, the sliding core 2 includes two half cores, which are respectively slidably assembled with the two needle bodies, so that when the two needle bodies are separated, their respective structures and functions remain unchanged and do not affect each other.

[0039] In a specific embodiment, the sliding core 2 may include a first half core and a second half core. The first half core is slidably arranged on the outside of the first needle body, and the second half core is slidably arranged on the outside of the second needle body. When the inner sides of the first needle body and the second needle body are juxtaposed at the center axis of the sliding core 2, the first half core and the second half core are combined to form a cylinder.

[0040] It is understandable that the cylinder formed by the combination of the first half core and the second half core can be a cylinder-like structure, and the calculation of the final winding circumference has nothing to do with its shape, but is calculated based on the extension radius of the blade 4.

[0041] For example, see Figure 2 A first sliding rib 11 is provided on the outer side of the first needle body, and a second sliding rib 12 is provided on the outer side of the second needle body, and the first sliding rib 11 and the second sliding rib 12 are symmetrical; correspondingly, a sliding groove 21 is provided at the central axis of the first half core and the second half core, and the two sliding grooves 21 are symmetrical, and the sliding groove 21 of the first half core is connected to the sliding groove 21 of the second half core to form a sliding cavity, and the cross-section of the sliding cavity is consistent with the cross-section when the first needle body and the second needle body are placed side by side.

[0042] Specifically, the first half core passes through the sliding groove 21 from the end of the first sliding rib 11 and is slidably arranged on the first needle body; the second half core passes through the sliding groove 21 from the end of the second sliding rib 12 and is slidably arranged on the second needle body.

[0043] When the two needle bodies are juxtaposed, the two half cores are combined to form a sliding core 2, which slides on the inner clamp needle 1. At the same time, a stop structure can be set at one end of the needle body to prevent the sliding core 2 from falling off, especially when the needle is stationary and transported.

[0044] In the embodiment of the present application, the lifting grooves 5 are opened on the sliding core 2 and can be evenly distributed based on the range of the half core. After the lifting grooves 5 on the two half cores are merged, even if the blades 4 assembled therein are combined to form a cylindrical winding structure, such as Figure 1 As shown in .

[0045] In a specific embodiment, a plurality of lifting grooves 5 may be provided at equal intervals on the circumference of the first and second half cores. For example, five lifting grooves 5 may be provided at equal intervals on the first half core, and the same number may be provided on the second half core.

[0046] The lifting groove 5 may extend axially from the front end surface of the sliding core 2 to the rear end surface, but the depth of the lifting groove 5 should not be too close to the axis of the sliding core 2 to ensure the structural stability of the sliding core 2.

[0047] The blade 4 is slidably assembled in the lifting groove 5. When the sliding core 2 slides on the needle body, it is only necessary to limit the blade 4 from sliding with it, so that the blade 4 can achieve the effect of lifting and lowering in situ along the inclined sliding trajectory. The limit frame 3 can be designed based on the inner clamping needle 1. The limit frame 3 can be used to limit the sliding of the blade 4 in the direction of the needle body, so that it can slide relative to the sliding core 2 and achieve fixed-point lifting and lowering along the inclined sliding trajectory, so that the blade 4 can stretch outward to increase the winding circumference and shrink inward to reduce the winding circumference.

[0048] In an embodiment of the present application, the limit frame 3 can be covered on the periphery of the sliding core 2 and fixed to the inner clamping needle 1. A plurality of limit holes 6 are provided on the limit frame 3 corresponding to the plurality of lifting grooves 5 provided on the sliding core 2. The axial sliding of the blade 4 is limited through the limit holes 6, so that the blade 4 can only slide and lift in the radial direction.

[0049] Exemplarily, the limit frame 3 is an annular structure, and the limit frame 3 includes a first half frame and a second half frame. The first half frame is fixed to the outside of the first needle body, and the first half core slides between the inside of the first half frame and the outside of the first needle body; the second half frame is fixed to the outside of the second needle body, and the second half core slides between the inside of the second half frame and the outside of the second needle body. When the two needle bodies are separated, the two half frames and the two half cores are separated into semi-cylindrical structures; when the two needle bodies are juxtaposed, the two half frames and the two half cores are merged into a cylindrical structure.

[0050] The structures of the first half frame and the second half frame can be symmetrical, and a single half frame can be Figure 4As shown in the figure, the structures of the two half frames are the same when not assembled (without distinguishing the installation position), and both include a semicircular ring frame 31 and two inner fixing plates 32 arranged on both sides of the ring frame 31. The two inner fixing plates 32 are symmetrical along the radial direction, and a plurality of limiting holes 6 are provided on the ring frame 31 at equal intervals along the axial direction. The plurality of limiting holes 6 can be distributed at equal intervals in the circumferential direction. It should be clear that the equal intervals of the plurality of limiting holes 6 on the ring frame 31 are for a single half frame, not for the limiting frame 3.

[0051] At the docking position of the two half frames, the distance between the two limiting holes 6 belonging to the two half frames is smaller than the distance between two adjacent limiting holes 6 belonging to the same half frame, so that the gap between the blades 4 carried by the two half frames is smaller, which is conducive to splicing into a winding structure that is closer to a cylindrical structure.

[0052] Taking into account the compactness of the structure, the length of the inner fixing plate 32 after being fixed to the fixed component should not be too long. Part of the inner fixing plate 32 can be placed behind the sliding core 2, and accommodating grooves 22 for accommodating the inner fixing plate 32 can be opened axially on both sides of the axial section of the first half core and the second half core. Of course, the accommodating groove 22 should be located outside the lifting groove 5.

[0053] In this application, the fixation of the two half frames is implemented based on the inner clamping needle 1. A first fixing component 13 can be set at the front end of the inner clamping needle 1 and a second fixing component 14 can be set at the rear end. The first fixing component 13 and the second fixing component 14 extend outside the sliding core 2 and are used to fix the installation limit frame 3.

[0054] The first fixing component 13 includes a first transverse plate and a second transverse plate, wherein the first transverse plate is arranged on both sides of the front end of the first needle body, located on the rear side of the first sliding rib 11, and can be flush with the inner side surface of the first needle body without affecting the sliding of the first half core; the second transverse plate is arranged on both sides of the front end of the second needle body, located on the rear side of the second sliding rib 12, and can be flush with the inner side of the second needle body without affecting the sliding of the second half core; the first transverse plate is used to fix the front end of the first half frame, and the second transverse plate is used to fix the front end of the second half frame.

[0055] The second fixing component 14 includes a first stop plate and a second stop plate, wherein the first stop plate is arranged on both sides of the rear section of the first needle body, located on the rear side of the first sliding rib 11, and can be flush with the inner side surface of the first needle body without affecting the sliding of the first half core; the second stop plate is arranged on both sides of the rear section of the second needle body, located on the rear side of the second sliding rib 12, and can be flush with the inner side surface of the second needle body without affecting the sliding of the second half core; the first stop plate is used to fix the rear end of the first half frame, and the second stop plate is used to fix the rear end of the second half frame.

[0056] For example, the two inner fixing plates 32 of the first half frame are fixed to the first transverse plate and the first stop plate provided on the first needle body, and the two inner fixing plates 32 of the second half frame are fixed to the second transverse plate and the second stop plate provided on the second needle body, so that the first half frame and the second half frame are combined to form the limiting frame 3. The fixing method can be screws, adhesive bonding, etc.

[0057] In this application, the limit frame 3 is installed based on the first fixing component 13 at the front end and the second fixing component 14 at the rear end of the inner clamping needle 1. The position of the second fixing component 14 can be determined according to the useful length of the blade 4 to meet the winding width requirements.

[0058] See also Figure 5 The blade 4 includes an arc-shaped support plate 41 and a long radial plate 42. The upper end of the radial plate 42 is vertically fixed to the inner side of the support plate 41. The bottom end of the radial plate 42 passes through the limiting hole 6 and is slidably connected to the lifting groove 5, so that the support plate 41 is suspended on the outside of the limiting frame 3; the length of the radial plate 42 is consistent with the length of the limiting hole 6.

[0059] The direction of the blade 4 is consistent with that of the inner clamp needle 1. The support plate 41 is a short arc segment, and the radial plate 42 is arranged along the radial direction of the sliding core 2. It is vertically fixed to the inner side of the arc of the support plate 41. The radial plate 42 is slid and snapped into the lifting groove 5, and an inclined sliding track is set. The axial sliding limit of the limit frame 3 can realize the fixed-point lifting and lowering of the blade 4 in the lifting groove 5.

[0060] As a preferred embodiment, the radial plate 42 is fixed to the midpoint of the arc of the support plate 41, and the blade 4 located at the boundary of the half core can adjust the docking position of the radial plate 42 and adjust it in the direction away from the boundary to reduce the circumferential length of the support plate 41 on the side close to the boundary; or, directly reduce the circumferential length of the support plate 41 on the side close to the boundary.

[0061] There are many embodiments for realizing an inclined sliding track based on the lifting groove 5 and the radial plate 42:

[0062] As a preferred embodiment, the bottom of the lifting groove 5 can be set to an inclined state, and the lower end of the radial plate 42 can also be set to an inclined state, and the degree of inclination is consistent with that of the groove bottom. A third sliding rib 43 is provided at the bottom end of the radial plate 42, and a sliding card groove is provided at the bottom of the groove, so that the bottom end of the radial plate 42 slides and is buckled into the bottom of the groove, so that when the blade 4 slides along it, its sliding trajectory is in an inclined state and remains coaxial with other blades 4.

[0063] In a specific implementation, the bottom depth of the lifting groove 5 can be gradually reduced from the front end to the rear end of the sliding core 2 to form a smooth inclined bottom groove. In this way, multiple lifting grooves 5 are opened on both sides of the sliding core 2. Figure 6 、 Figure 7As shown in the figure; the bottom end of the diameter plate 42 is tilted, and the inclination degree of the bottom end of the diameter plate 42 is the same as the inclination degree of the bottom of the lifting groove 5. The bottom of the lifting groove 5 is provided with a sliding card slot, and the bottom end of the diameter plate 42 is provided with a third sliding rib 43 corresponding to the sliding card slot. The third sliding rib 43 slides and snaps into the sliding card slot, so that the sliding trajectory of the blade 4 in the lifting groove 5 is in an inclined state.

[0064] The structure of the third sliding rib 43 can be the same as or similar to the structure of the first sliding rib 11 and the second sliding rib 12 shown in the figure, and the structure of the sliding groove can be the same as or similar to the structure of the sliding groove opened at the axis of the first half core and the second half core.

[0065] As a feasible embodiment, a sliding shaft can be provided on the side of the radial plate 42. The number of sliding shafts can be multiple and they are in an inclined state. An inclined sliding groove is provided on the side wall of the lifting groove 5. The inclination degree of the sliding groove is the same as the inclination degree of the multiple sliding shafts. The sliding shaft is slidably arranged in the sliding groove, so that the sliding trajectory of the blade 4 in the lifting groove 5 is in an inclined state.

[0066] With the cooperation of the limit frame 3, the sliding core 2 is pushed to slide along the direction of the inner clamping needle 1, thereby synchronously pushing the multiple blades 4 to expand outward or contract inward with the same stroke, thereby increasing or decreasing the space enclosed by the multiple blades 4, that is, the winding circumference increases or decreases.

[0067] The power of the sliding core 2 can be manually operated; it can also be provided by a power device. The rear end of the sliding core 2 can be connected to the output end of the telescopic structure, and the telescopic structure can be connected to the motor transmission and driven by the motor; the motor is connected to the PLC controller that controls the winding. The PLC controller controls the operation of the motor according to the parameters measured and fed back by the CCD, thereby adjusting the telescopic stroke of the screw so that the winding circumference meets the usage requirements.

[0068] The sliding core 2 can be moved by driving the telescopic screw through a motor, and the plurality of blades 4 can be simultaneously pushed to expand or contract, thereby achieving variable adjustment of the circumference of the winding needle.

[0069] Furthermore, during the winding process, the CCD measures and feeds back the tab spacing, and the PLC gives the appropriate winding needle circumference through transportation, calculates the variables of blade 4 (diameter, circumference), screw variables (extension length), and controls the motor to drive the screw to run, thereby achieving the required winding circumference.

[0070] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," 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 elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0071] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific embodiments of the present invention are not limited to these descriptions. For those skilled in the art of the present invention, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the scope of protection of the present invention.

Claims

1. A circular winding needle with adjustable winding needle circumference, characterized in that: The invention comprises an inner clamping needle (1), a sliding core (2) and a blade (4), wherein the inner clamping needle (1) is slidably arranged at the central axis of the sliding core (2), and a plurality of lifting grooves (5) are opened axially in the circumferential direction of the sliding core (2), and a plurality of blades (4) are slidably arranged in the lifting grooves (5) in sequence, and the sliding tracks of the blades (4) in the lifting grooves (5) are in an inclined state as a whole, and the plurality of blades (4) run synchronously along the sliding tracks, so that the space enclosed by the plurality of blades (4) increases or decreases.

2. A circular winding needle with adjustable winding needle circumference according to claim 1, characterized in that: The inner clamp needle (1) includes a first needle body and a second needle body placed side by side, and the sliding core (2) includes a first half core and a second half core, wherein the first half core is slidably arranged on the outside of the first needle body, and the second half core is slidably arranged on the outside of the second needle body, and when the inner sides of the first needle body and the second needle body are placed side by side at the central axis of the sliding core (2), the first half core and the second half core are combined to form a cylinder.

3. A circular winding needle with adjustable winding needle circumference according to claim 2, characterized in that: A plurality of lifting grooves (5) are provided at equal intervals in the circumferential direction of the first half core and the second half core, and the lifting grooves (5) extend axially from the front end surface of the sliding core (2) to the rear end surface.

4. A circular winding needle with adjustable winding needle circumference according to claim 2, characterized in that: It also includes a limit frame (3), which is covered on the periphery of the sliding core (2) and fixed to the inner clamping needle (1), and a plurality of limit holes (6) are provided on the limit frame (3) corresponding to the plurality of lifting grooves (5) provided on the sliding core (2).

5. A circular winding needle with adjustable winding needle circumference according to claim 4, characterized in that: The limiting frame (3) comprises a first half frame and a second half frame, wherein the first half frame is fixed to the outside of the first needle body, and the first half core is slidably located between the inside of the first half frame and the outside of the first needle body; the second half frame is fixed to the outside of the second needle body, and the second half core is slidably located between the inside of the second half frame and the outside of the second needle body.

6. A circular winding needle with adjustable winding needle circumference according to claim 5, characterized in that: The front end of the inner clamping needle (1) is provided with a first fixing component (13) and the rear end is provided with a second fixing component (14), and the first fixing component (13) and the second fixing component (14) extend outside the sliding core (2); the first fixing component (13) includes a first transverse plate and a second transverse plate, the first transverse plate is used to fix the front end of the first half frame, and the second transverse plate is used to fix the front end of the second half frame; the second fixing component (14) includes a first stop plate and a second stop plate, the first stop plate is used to fix the rear end of the first half frame, and the second stop plate is used to fix the rear end of the second half frame, so that the first half frame and the second half frame are combined to form the limit frame (3).

7. A circular winding needle with adjustable winding needle circumference according to claim 5, characterized in that: The blade (4) comprises an arc-shaped support plate (41) and an elongated radial plate (42); the upper end of the radial plate (42) is vertically fixed to the inner side of the support plate (41); the bottom end of the radial plate (42) passes through the limiting hole (6) and is slidably connected to the lifting groove (5), so that the support plate (41) is suspended outside the limiting frame (3); the length of the radial plate (42) is consistent with the length of the limiting hole (6).

8. A circular winding needle with adjustable winding needle circumference according to claim 7, characterized in that: The bottom depth of the lifting groove (5) gradually decreases from the front end to the rear end of the sliding core (2), the bottom end of the radial plate (42) is tilted, and the tilt degree of the bottom end of the radial plate (42) is the same as the tilt degree of the bottom of the lifting groove (5), the bottom of the lifting groove (5) is provided with a sliding groove, and the bottom end of the radial plate (42) is provided with a third sliding rib (43) corresponding to the sliding groove, and the third sliding rib (43) is slidably buckled in the sliding groove, so that the sliding track of the blade (4) in the lifting groove (5) is in an inclined state.

9. A circular winding needle with adjustable winding needle circumference according to claim 6, characterized in that: The first half frame and the second half frame both comprise a semicircular ring frame (31) and two inner fixing plates (32) provided on both sides of the ring frame (31), the two inner fixing plates (32) being symmetrical along the radial direction, and a plurality of the limiting holes (6) being provided on the ring frame (31) at equal intervals along the axial direction; both sides of the axial section of the first half core and the second half core are provided with accommodating grooves (22) for accommodating the inner fixing plates (32) along the axial direction, and the accommodating grooves (22) are located outside the lifting groove (5).

10. The circular winding needle with adjustable winding needle circumference according to claim 7, characterized in that: A sliding shaft is provided on the side of the radial plate (42), and an inclined sliding groove is provided on the side wall of the lifting groove (5). The sliding shaft is slidably arranged in the sliding groove, so that the sliding track of the blade (4) in the lifting groove (5) is in an inclined state.

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