A variable diameter winding needle device

Abstract

This invention discloses a variable diameter needle winding device, comprising a needle winding mechanism, a moving drive mechanism, and a rotating drive mechanism. The needle winding mechanism includes a fixed base, a needle, and a winding shaft. The needle and the winding shaft are respectively disposed at a first end and a second end of the fixed base. The winding shaft is connected to the moving drive mechanism and the rotating drive mechanism, respectively. The needle includes a fixed needle component and a movable needle component arranged opposite to each other. A fixed mounting groove and a movable mounting groove are respectively provided on adjacent sides of the fixed needle component and the movable needle component. A fixed mounting seat is disposed within the fixed mounting groove, with one end of the fixed mounting seat extending out of the fixed mounting groove and disposed at the first end of the fixed base. The movable mounting groove contains a movable mounting seat and a base plate, with one end of the movable mounting seat extending out of the movable mounting groove and disposed at the first end of the fixed base. This invention improves equipment efficiency and uptime.

Description

Technical Field

[0001] This invention relates to the field of lithium battery cell manufacturing technology, specifically to a variable diameter winding needle device. Background Technology

[0002] Currently, the winding process of lithium battery cells is generally completed by the needle winding device of a winding machine. The needle winding device typically includes a needle winding mechanism, a moving drive mechanism for driving the needle winding mechanism forward and backward, and a rotating drive mechanism for driving the needle winding mechanism to rotate. The needle winding mechanism generally includes a fixed base and winding shafts and needles located at both ends of the fixed base. The winding shafts are connected to the moving drive mechanism and the rotating drive mechanism, respectively. In actual cell winding, since the cell electrodes are usually supplied in whole rolls, the spacing between the various tabs of the electrodes generally has a certain error, which leads to tab misalignment during the winding process. Existing methods for correcting tab misalignment generally involve manually removing the needles from the needle winding mechanism after the machine stops, then attaching a Teflon film to the needles or adding shims inside the needles to adjust the winding diameter. This allows for adjustment of the electrode alignment when winding the next cell, thus correcting the tab misalignment. However, this method requires manual intervention such as unwinding the coils, which is time-consuming and seriously affects equipment efficiency and utilization rate. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a variable diameter winding needle device that does not require manual intervention such as unwinding the winding needle, is time-saving, and improves equipment efficiency and uptime.

[0004] The technical solution adopted by this invention to solve its technical problem is: A variable diameter needle winding device includes a needle winding mechanism, a moving drive mechanism, and a rotating drive mechanism. The needle winding mechanism includes a fixed base, a needle, and a winding shaft. The needle and the winding shaft are respectively disposed at a first end and a second end of the fixed base. The winding shaft is connected to the moving drive mechanism and the rotating drive mechanism, respectively. The needle includes a fixed needle component and a movable needle component arranged opposite to each other. A fixed mounting groove and a movable mounting groove are respectively provided on adjacent sides of the fixed needle component and the movable needle component. A fixed mounting seat is provided in the fixed mounting groove, with one end of the fixed mounting seat extending out of the fixed mounting groove and disposed at the first end of the fixed base. A movable mounting groove contains a movable mounting seat and a base plate, with one end of the movable mounting seat extending out of the movable mounting groove and disposed at the first end of the fixed base. A camshaft is rotatably mounted on the first end of the fixed base. The camshaft and the movable mounting base can rotate relative to each other. An eccentric block is provided on the outer circumferential surface of the camshaft. The base plate is located between the bottom of the movable mounting base and the bottom of the movable mounting groove and is disposed at the bottom of the movable mounting groove. The base plate is provided with a guide post and a rolling element. The movable mounting base is provided with a sliding bearing. The guide post is connected to the movable mounting base through the sliding bearing. The rolling element contacts the bottom of the movable mounting groove and one end of the eccentric block, respectively. The rolling element can rotate on the outer circumferential surface of the eccentric block and can move between the two ends of the eccentric block along the circumference of the eccentric block. The movement of the rolling element can drive the movable needle coiling component and the base plate away from or towards the fixed needle coiling component.

[0005] As a preferred technical solution, the movable mounting base has a receiving groove and a recess on the side near the base plate. The recess is located between the fixed base and the movable coiling part and accommodates a connecting seat. The connecting seat protrudes from the side of the movable mounting base near the base plate and is inclined relative to the movable mounting base. The camshaft is rotatably disposed in the receiving groove, and one end of the camshaft extends into the recess and is connected to one end of the connecting seat.

[0006] As a preferred technical solution, the connecting seat is provided with a locking structure, which includes a positioning rod, a rocker arm, a connecting block, a locking block, and two arc-shaped locking elements; the positioning rod is rotatably mounted on the end of the connecting seat away from the camshaft; the rocker arm is inclined relative to the connecting seat, and one end of the rocker arm forms a mounting portion. The rocker arm is rotatably connected to the connecting seat through the mounting portion. The rocker arm corresponds to the positioning rod and has a gap with the positioning rod. The rocker arm can rotate relative to the connecting seat in a direction closer to or away from the positioning rod. When the rocker arm rotates in a direction closer to the positioning rod, the rocker arm can abut against the positioning rod. The connecting block is housed within the mounting cavity of the connecting seat. The locking block extends through the mounting cavity. One end of the locking block has a locking position, and the other end is connected to the bottom of the mounting cavity via a locking elastic element. One end of the connecting block is connected to the mounting part, and the other end abuts against the bottom of the locking position. Both locking elements are disposed within the groove. The connecting seat is located between the two locking elements. The two locking elements protrude from the side of the movable mounting seat near the base plate. The inner circumferential surfaces of the two locking elements are each provided with two teeth. The locking position is located between the two teeth, and the locking end of the locking block abuts against one end of the two teeth.

[0007] As a preferred technical solution, the end of the connecting seat away from the camshaft is provided with a cavity, and two through holes are provided on the inner walls of the two sides of the cavity. The positioning rod is movably disposed through the two through holes and a positioning rod bearing is sleeved on its outer periphery. The positioning rod bearing is housed in the cavity and the positioning rod bearing extends out of the cavity. The end of the rocker arm away from the mounting part is rotatably provided with a rocker arm bearing.

[0008] As a preferred technical solution, a connecting block bearing is rotatably provided at one end of the connecting block that abuts against the bottom of the locking position, and the connecting block bearing abuts against the bottom of the locking position.

[0009] As a preferred technical solution, the needle winding device further includes a shift fork mechanism located on one side of the needle winding. The shift fork mechanism includes a shift fork mounting plate, a shift fork base plate disposed on one side of the shift fork mounting plate, a shift fork driving unit disposed on the side of the shift fork base plate away from the shift fork mounting plate, and a shift fork. The shift fork is connected to the shift fork driving unit and is slidably connected to the side of the shift fork base plate away from the shift fork mounting plate. One end of the shift fork is provided with a fork opening. The shift fork driving unit is used to drive the shift fork to move towards or away from the needle winding, so as to engage or release the positioning rod and the swing rod through the fork opening. When the positioning rod and the swing rod are engaged through the fork opening, the end of the positioning rod away from the connecting seat extends out from the fork opening. The positioning rod bearing contacts the inner wall of one side of the fork opening, the swing rod bearing abuts against the inner wall of the other side of the fork opening, and the swing rod abuts against the positioning rod.

[0010] As a preferred technical solution, the shift fork mechanism further includes a laser sensor, which is disposed on the side of the shift fork base plate away from the shift fork mounting plate, and is used to detect the presence or absence of the positioning rod.

[0011] As a preferred technical solution, the sliding bearing is an oil-free bushing.

[0012] As a preferred technical solution, there is a gap between the base plate and the movable mounting seat, and a through groove is provided on the side of the base plate near the movable mounting seat. A rolling mounting seat is provided in the through groove, and the rolling element is located in the through groove and is disposed on the rolling mounting seat.

[0013] As a preferred technical solution, the movable mounting base is provided with a guide fastener, one end of which is movably inserted into the guide hole of the base plate.

[0014] The beneficial effects of this invention are: by setting up a winding needle, the winding diameter can be adjusted without manual intervention such as unwinding the winding needle, which is time-saving, improves equipment efficiency and utilization rate, reduces labor costs, and reduces the scrap rate of battery cells. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 , Figure 2 This is a schematic diagram of the structure of a variable diameter winding needle device provided in an embodiment of the present invention; Figure 3 yes Figure 1 A schematic diagram of the needle winding mechanism of the needle winding device shown, after removing the winding shaft; Figure 4 yes Figure 3A schematic diagram of the movable needle winding component, movable mounting base, and base plate of the needle winding mechanism shown; Figure 5 yes Figure 4 The diagram shows the structure of the movable mounting base and the base plate. Figure 6 yes Figure 5 A bottom view of the movable mounting base and base plate shown; Figure 7 yes Figure 3 Exploded view of the movable needle winding component, movable mounting base, and base plate of the needle winding mechanism shown; Figure 8 yes Figure 3 A schematic diagram of the camshaft of the needle winding mechanism shown; Figure 9 yes Figure 3 The diagram shows the connecting seat, locking structure, and part of the camshaft of the needle winding mechanism. Figure 10 yes Figure 3 The diagram shows a side view of the connecting seat, locking structure, and camshaft of the needle winding mechanism. Figure 11 yes Figure 3 An exploded view of the connecting seat and locking structure of the needle winding mechanism shown; Figure 12 yes Figure 1 A schematic diagram of the needle winding mechanism of the needle winding device shown, after removing the winding shaft and the shift fork mechanism; Figure 13 yes Figure 12 A magnified view of a portion at point A shown; Figure 14 yes Figure 12 An exploded view of the shift fork mechanism shown. Detailed Implementation

[0017] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.

[0018] Please refer to Figure 1 and Figure 2An embodiment of the present invention provides a variable diameter needle winding device, including a needle winding mechanism 10, a moving drive mechanism 30 for driving the needle winding mechanism 10 to move back and forth, a rotating drive mechanism for driving the needle winding mechanism 10 to rotate, and a shift fork mechanism 70.

[0019] The winding mechanism 10 includes a fixed base 12, a winding shaft 14, and a cylindrical winding needle 20. The winding needle 20 and the winding shaft 14 are respectively disposed at the first end and the second end of the fixed base 12. The winding needle 20 is used to wind and form the battery cell.

[0020] The winding shaft 14, the fixing seat 12, and the winding needle 20 pass through the winding head of the winding machine, which is rotatably mounted within two rings 100. The two rings 100 are connected by a connecting post (not shown in the figure), wherein the front ring 100 is mounted on the fixed plate of the winding machine. The winding shaft 14, the fixing seat 12, and the winding needle 20 can rotate together with the winding head, which can drive the winding shaft 14, the fixing seat 12, and the winding needle 20 to rotate from the unloading station to the winding station or from the winding station to the unloading station. The fixed plate has areas corresponding to the winding station and the unloading station to facilitate the passage and rotation of the winding needle 20 within these areas.

[0021] The moving drive mechanism 30 has an existing structure. It is located to the left of the needle winding mechanism 10 and is arranged parallel to it. The moving drive mechanism 30 includes a linear module 32, a moving rod 34, a support plate 33, a sliding block 35, and a pull rod 37. The support plate 33 is located on the left side of the two rings 100, and the linear module 32 is located on the side of the support plate 33 away from the needle winding mechanism 10. The moving rod 34 is located inside the linear module 32. One end of the moving rod 34 is fixedly connected to the lead screw nut of the linear module 32, and the other end extends from the linear module 32 and is connected to the sliding block 35 via a mounting block 342. The sliding block 35 is slidably engaged with a slide rail 36, which is located on the side of the support plate 33 near the needle winding mechanism 10 and extends along the length of the support plate 33. One end of the pull rod 37 is mounted on the sliding block 35, and the other end extends toward the needle winding mechanism 10 and is equipped with two cam followers 38. Two cam followers 38 cooperate with cams 142 mounted on the winding shaft 14, and cams 142 can rotate relative to the two cam followers 38. A linear module 32 drives the moving rod 34 to move back and forth, thereby causing the sliding block 35 to move back and forth along the slide rail 36, which in turn causes the pull rod 37 to move back and forth. When the linear module 32 drives the moving rod 34 to move back and forth, the cooperation of the two cam followers 38 and cams 142 causes the winding shaft 14, the fixed seat 12, and the winding needle 20 to move back and forth relative to the winding head.

[0022] The rotary drive mechanism is an existing structure, mainly consisting of a servo motor. The winding shaft 14 is connected to the servo motor via a synchronous belt assembly. Specifically, the synchronous belt assembly includes a driving pulley, a driven pulley 52, and a synchronous belt 53 fitted around the driving pulley and driven pulley 52. ​​The driving pulley is fitted around the output end of the servo motor, and the driven pulley 52 is fitted around the winding shaft 14. The servo motor drives the driving pulley to rotate through its output end. Under the action of the synchronous belt 53 and the driven pulley 52, the winding shaft 14 can rotate relative to the winding head. The cam 142, the fixed seat 12, and the winding needle 20 can rotate together with the winding shaft 14. When the linear module 32 drives the moving rod 34 to move back and forth, the rotary drive mechanism can move together with the winding shaft 14, the fixed seat 12, and the winding needle 20. When the winding shaft 14, the fixed seat 12, and the winding needle 20 rotate together with the winding head, the rotary drive mechanism cannot rotate together with the winding head.

[0023] Combination Figure 3 and Figure 11As shown, the needle coil 20 includes a semi-circular fixed needle coil member 22 and a semi-circular movable needle coil member 23 arranged opposite each other on the left and right sides. A gap exists between the fixed needle coil member 22 and the movable needle coil member 23. A fixed mounting groove and a movable mounting groove 232 extending axially along the needle coil 20 are respectively provided on the adjacent sides of the fixed needle coil member 22 and the movable needle coil member 23. A fixed mounting seat 24 is provided within the fixed mounting groove; specifically, the fixed mounting seat 24 is set at the bottom of the fixed mounting groove by screws or the like. One end of the fixed mounting seat 24 is U-shaped and extends beyond the fixed mounting groove, and is set in a first mounting hole at the first end of the fixed seat 12 by screws or the like. A fixed positioning block 242 is formed at the other end of the fixed mounting seat 24, and the fixed positioning block 242 is located outside the fixed mounting groove. The movable mounting slot 232 contains a movable mounting base 25 and a base plate 26. The base plate 26 is located between the bottom of the movable mounting base 25 and the bottom of the movable mounting slot 232 and is fixed to the bottom of the movable mounting slot 232 by screws or the like. There is a gap between the base plate 26 and the movable mounting base 25. The fixed mounting base 24 and the movable mounting base 25 are arranged opposite each other. One end of the movable mounting base 25 is U-shaped and extends out of the movable mounting slot 232, and is fixed in the second mounting hole at the first end of the fixed base 12 by screws or the like. The other end of the movable mounting base 25 forms a movable positioning block 252, which is located outside the movable mounting slot 232. The fixed positioning block 242 and the movable positioning block 252 are used to cooperate with the positioning holes of the positioning mechanism of the winding machine. When the winding needle 20 is in the winding position, the winding needle 20 is driven forward by the moving drive mechanism 30, so that the fixed positioning block 242 and the movable positioning block 252 can cooperate with the positioning holes, thereby allowing the positioning mechanism to rotate and support the winding needle 20. Two semi-circular clamping pins 27 are provided between the movable mounting base 25 and the fixed mounting base 24. The two clamping pins 27 are arranged facing each other from left to right, forming a clamping gap between them for clamping the diaphragm, and do not contact the fixed mounting base 24 or the movable mounting base 25. One end of each clamping pin 27 is located at the first end of the fixed base 12, and the other end is located between the fixed positioning block 242 and the movable positioning block 252.

[0024] The movable needle winding component 23 has two hollowed-out positions 233 on the side near the fixed needle winding component 22. The two hollowed-out positions 233 are spaced apart and communicate with the movable mounting groove 232, such as... Figure 7 As shown, the hollowed-out portion 233 reduces the weight of the movable needle coiling component 23. The structure of the fixed needle coiling component 22 is the same as that of the movable needle coiling component 23.

[0025] A camshaft 255 is rotatably mounted on the movable mounting base 25, and the camshaft 255 and the movable mounting base 25 can rotate relative to each other. Specifically, the movable mounting base 25 has a receiving groove and a recess 254 extending axially along the winding needle 20 on the side near the base plate 26, and the recess 254 communicates with the receiving groove. The camshaft 255 is received in the receiving groove, and one end of the camshaft 255 extends into the recess 254. A cam seat 2553 is provided on the side of the movable mounting base 25 near the base plate 26 by screws or the like, and parts of the cam seat 2553 are respectively received in the receiving positions 269 of the base plate 26. The cam seat 2553 has recessed positions 25532 on one side near the receiving groove, forming an installation space between the recessed positions 25532 and the bottom of the receiving groove. Rotary bearings 2554 are respectively installed within the installation space, and are sleeved on the outer circumference of the cam shaft 255. Thus, the movable mounting seat 25 and the cam shaft 255 can rotate relative to each other through the rotary bearings 2554. In this embodiment, there are two cam seats 2553, each located near one end of the cam shaft 255. Therefore, there are two receiving positions 269, two installation spaces, and two rotary bearings 2554. It can be understood that the number of cam seats 2553, receiving positions 269, installation spaces, and rotary bearings 2554 can be set according to actual conditions.

[0026] A limiting seat 2555 is installed on the side of the movable mounting base 25 near the base plate 26 by screws, etc. Of the two cam seats 2553, the cam seat 2553 that is far away from the groove 254 is located between the limiting seat 2555 and the cam seat 2553 that is close to the groove 254. The side of the limiting seat 2555 near the receiving groove has a limiting groove that is rotatably engaged with the end of the cam shaft 255 that is far away from the groove 254. Of the two rotating bearings 2554, the rotating bearing 2554 that is far away from the groove 254 is in contact with the limiting seat 2555, and its outer diameter is larger than the inner diameter of the limiting groove, so that the rotating bearing 2554 can be limited by the limiting seat 2555.

[0027] A guide post 265 is provided on the side of the base plate 26 near the movable mounting base 25, and a bearing mounting hole 253 is provided on the side of the movable mounting base 25 near the base plate 26. A sliding bearing 2652 is disposed in the bearing mounting hole 253 and sleeved on the outer periphery of the guide post 265, so that the guide post 265 is connected to the movable mounting base 25 through the sliding bearing 2652, and the guide post 265 can move left and right relative to the sliding bearing 2652. The sliding bearing 2652 is preferably an oil-free bushing. In this embodiment, there are four guide posts 265, which are arranged symmetrically in pairs. The number of sliding bearings 2652 and bearing mounting holes 253 corresponds to the number of guide posts 265, which is also four. It can be understood that the number of guide posts 265 and sliding bearings 2652 can be set according to the actual situation, and the position of the guide posts 265 can also be set according to the actual situation.

[0028] The outer circumferential surface of the camshaft 255 is provided with two eccentric block groups. Each eccentric block group includes two arc-shaped eccentric blocks 2552, which are spaced apart. The center of the circle containing the eccentric blocks 2552 is located on one side of the center of the camshaft 255, and does not coincide with the center of the camshaft 255. The side of the base plate 26 near the movable mounting seat 25 is provided with two through slots 262, which are located between two receiving positions 269. Four guide posts 265 are located between the two through slots 262. Two rolling mounting seats 263 are provided in the two through slots 262 respectively. The upper and lower ends of the rolling mounting seats 263 are respectively formed with two mounting protrusions 2632. The two mounting protrusions 2632 are respectively set on the side of the base plate 26 near the movable mounting seat 25 by screws, etc. Each rolling mounting base 263 corresponds to an eccentric block group. Each rolling mounting base 263 has two rolling elements 264 at its front and rear ends, respectively, via pins or similar means. The rolling elements 264 are preferably bearings. The two rolling elements 264 are located within corresponding through grooves 262 and correspond to the two eccentric blocks 2552 of their respective eccentric block groups. Each rolling element 264 contacts the bottom of the movable mounting groove 232 and the upper end of the corresponding eccentric block 2552. When the movable mounting base 25 rotates relative to the camshaft 255, since the guide post 265 is connected to the movable mounting base 25 through the sliding bearing 2652, the base plate 26 and the movable needle coiling component 23 can rotate together with the movable mounting base 25 under the action of the guide post 265 and the sliding bearing 2652. Driven by the base plate 26, the rolling element 264 can rotate on the outer circumferential surface of the corresponding eccentric block 2552, i.e., rotate on its own axis, and can move between the two ends of the corresponding eccentric block 2552 along the circumference of the corresponding eccentric block 2552. When the rolling element 264 moves between the two ends of the corresponding eccentric block 2552, the guide post 265 and the sliding bearing 2652... Under the guidance of 2652, the rolling element 264 can drive the movable needle coil 23 and the base plate 26 away from or closer to the fixed needle coil 22. Therefore, when the movable mounting seat 25 rotates relative to the camshaft 255, the movable needle coil 23 and the base plate 26 can rotate together with the movable mounting seat 25. Through the eccentric movement of the rolling element 264, the movable needle coil 23 and the base plate can be driven away from or closer to the fixed needle coil 22, thereby increasing or decreasing the distance between the movable needle coil 23 and the fixed needle coil 22. This can change the winding diameter of the needle coil 20, thus achieving the adjustment of the winding diameter of the needle coil 20 without the need for manual disassembly of the needle coil 20.

[0029] Furthermore, the movable mounting base 25 is provided with a guide fastener 258. One end of the guide fastener 258 is movably inserted into the guide hole 267 of the base plate 26. The guide fastener 258 is, for example, a screw. When the movable mounting base 25 rotates relative to the camshaft 255, under the connection of the guide post 265, the sliding bearing 2652, and the guide fastener 258, the base plate 26 and the movable needle coil 23 can rotate together with the movable mounting base 25. When the rolling element 264 moves between the two ends of the corresponding eccentric block 2552, under the guidance of the guide post 265, the sliding bearing 2652, and the guide fastener 258, the rolling element 264 can drive the movable needle coil 23 and the base plate 26 to move away from or closer to the fixed needle coil 22.

[0030] Specifically, in this embodiment, there are eight guide fasteners 258. The upper and lower ends of the movable mounting base 25 are respectively provided with two upper slots 257 and two lower slots, which are located between two through slots 262. The upper end of the movable mounting base 25 near the base plate 26 is provided with two upper mounting holes 2572a at the position corresponding to each upper slot 257. The lower end of the movable mounting base 25 near the base plate 26 is provided with two lower mounting holes 2572b at the position corresponding to each lower slot. Each upper mounting hole 2572a and lower mounting hole 2572b is provided with a guide fastener 258. One end of the guide fastener 258 protrudes from the side of the movable mounting base 25 near the base plate 26 and is movably inserted into the guide hole 267 of the base plate 26. Each guide fastener 258 is fitted with a clamping elastic element 259 on its outer periphery. The clamping elastic element 259 is preferably a spring. The clamping elastic element 259 is located in the corresponding slot. One end of the clamping elastic element 259 is connected to the end of the corresponding guide fastener 258 away from the guide hole 267, and the other end is connected to the inner wall of the corresponding slot near the bottom plate 26. The clamping elastic element 259 is in a compressed state. Understandably, the number of guide fasteners 258, upper slots 257, lower slots, upper mounting holes 2572a, lower mounting holes 2572b, and clamping elastic elements 259 can be set according to the actual situation.

[0031] A connecting seat 256 is housed within the groove 254, with a portion of the connecting seat 256 protruding from the side of the movable mounting base 25 near the base plate 26. The connecting seat 256 is inclined relative to the movable mounting base 25. In this embodiment, the connecting seat 256 is inclined towards the lower inner wall of the groove 254, and the connecting seat 256 is close to the lower inner wall of the groove 254. One end of the connecting seat 256 is fitted onto the outer periphery of the end of the camshaft 255 that extends into the groove 254, thereby connecting one end of the connecting seat 256 to the end of the camshaft 255 that extends into the groove 254. In this embodiment, the cross-sectional shape of the end of the camshaft 255 that extends into the groove 254 is rectangular, such as... Figure 7 and Figure 8 As shown, one end of the connector 256 has a rectangular mounting hole 2561, as... Figure 11 As shown, one end of the connecting seat 256 is fitted onto the outer periphery of the end of the camshaft 255 that extends into the groove 254 through the rectangular mounting hole 2561. This structure can fix the connecting seat 256 and the camshaft 255 together, thereby preventing the connecting seat 256 and the camshaft 255 from rotating relative to each other.

[0032] The connecting seat 256 is provided with a locking structure, which is used to lock the connecting seat 256, the camshaft 255 and the movable mounting seat 25 together. The locking structure includes a positioning rod 282, a rocker arm 283, a connecting block 284, a locking block 285 and two arc-shaped locking elements 286.

[0033] Specifically, a positioning rod 282 is rotatably provided at the end of the connecting seat 256 away from the camshaft 255. The positioning rod 282 is located between the connecting seat 256 and the fixed seat 12, that is, the positioning rod 282 is located behind the movable coiling needle 23, and the positioning rod 282 is perpendicular to the connecting seat 256.

[0034] The rocker arm 283 is located between the connecting seat 256 and the fixed seat 12 and is inclined relative to the connecting seat 256. In this embodiment, the rocker arm 283 is inclined towards the upper inner wall of the groove 254 relative to the connecting seat 256. The axis of the rocker arm 283 forms an angle with the axis of the connecting seat 256, and the angle can be set according to the actual situation. One end of the rocker arm 283 is integrally formed with a mounting part 2832. The rocker arm 283 is rotatably connected to the connecting seat 256 through the mounting part 2832. Specifically, the mounting part 2832 passes through the connecting seat 256 and can rotate relative to the connecting seat 256. The extension direction of the line connecting the mounting part 2832 and the positioning rod 282 is the same as the axial direction of the connecting seat 256. The rocker arm 283 corresponds to the positioning rod 282 and has a gap between them. That is, the positioning rod 282 is located between the two ends of the rocker arm 283. The rocker arm 283 can rotate relative to the connecting seat 256 in a direction closer to or further away from the positioning rod 282. When the rocker arm 283 rotates towards the positioning rod 282, it abuts against the positioning rod 282. The rocker arm 283 is used to abut against the positioning rod 282.

[0035] The connecting block 284 is housed within the mounting cavity 2563 of the connecting seat 256. The locking block 285 extends through the mounting cavity 2563. One end of the locking block 285 has a locking position 2852, and the other end is connected to the bottom of the mounting cavity 2563 via a locking elastic element 2853, preferably a spring. One end of the connecting block 284 is connected to the mounting portion 2832 by being sleeved around its outer periphery, and the other end abuts against the bottom of the locking position 2852.

[0036] Both locking elements 286 are disposed within the groove 254. Specifically, the two ends of the two locking elements 286 are respectively mounted on the upper and lower inner walls of the groove 254 by screws or the like. The connecting seat 256 is located between the two locking elements 286, and portions of the two locking elements 286 protrude from the side of the movable mounting seat 25 near the base plate 26. The inner circumferential surfaces of the two locking elements 286 are each provided with two teeth 2862, and a locking position 2852 is located between the two teeth 2862. The end of the locking block 285 with the locking position 2852 abuts against the lower ends of the two teeth 2862. In practical applications, as the rocker arm 283 rotates relative to the connecting seat 256 toward the positioning rod 282 until the rocker arm 283 abuts against the positioning rod 282, the rotation of the rocker arm 283 can drive the connecting block 284 to rotate. The rotation of the connecting block 284 can push the locking block 285 to move away from the teeth 2862 of the locking member 286. At the same time, the locking elastic member 2853 is compressed. At this time, the end of the locking block 285 with the locking position 2852 separates from the lower end of the two teeth 2862, thus unlocking is achieved, and the connecting seat 256, camshaft 255 and movable mounting seat 25 are separated. When the locking elastic element 2853 is reset, the locking elastic element 2853 can push the locking block 285 to move towards the teeth 2862 of the locking element 286 until the end of the locking block 285 with the locking position 2852 abuts against the lower ends of the two teeth 2862. The movement of the locking block 285 can drive the connecting block 284 and the rocker arm 283 to rotate away from the positioning rod 282 to the initial position, thus locking the connecting seat 256, the camshaft 255 and the movable mounting seat 25 together.

[0037] In this embodiment, the two locking members 286 have "+" and "-" marks respectively at the upper and lower ends of the corresponding teeth 2862 on their opposite sides, and a "0" mark is provided at the middle of the corresponding teeth 2862 on their opposite sides. Figure 10As shown, when each rolling element 264 contacts the bottom of the movable mounting groove 232 and the upper end of the corresponding eccentric block 2552, the end of the locking block 285 with the locking position 2852 corresponds to the lower end of the two teeth 2862, which corresponds to the "-" mark. At this time, the winding diameter of the needle coil 20 is the smallest. When each rolling element 264 contacts the bottom of the movable mounting groove 232 and the lower end of the corresponding eccentric block 2552, the end of the locking block 285 with the locking position 2852 corresponds to the upper end of the two teeth 2862, which corresponds to the "+" mark. At this time, the winding diameter of the needle coil 20 is the smallest. When each rolling element 264 contacts the bottom of the movable mounting groove 232 and the middle of the corresponding eccentric block 2552, the end of the locking block 285 with the locking position 2852 corresponds to the middle of the two teeth 2862, which corresponds to the "0" mark. At this time, the winding diameter of the needle coil 20 is the largest. The angle between the line connecting the upper end of the tooth 2862 and the center of the circle containing the locking member 286 and the lower end of the tooth 2862 and the center of the circle containing the locking member 286 is 60-90 degrees. Understandably, this angle can be set according to the actual situation.

[0038] The connecting seat 256 has a cavity 2562 at the end away from the camshaft 255. The front and rear inner walls of the cavity 2562 each have two through holes 25622. A positioning rod 282 partially movably passes through the two through holes 25622, and a positioning rod bearing 2822 is fitted around its outer periphery. The positioning rod bearing 2822 is housed within the cavity 2562, with a portion extending beyond it. Specifically, the positioning rod bearing 2822 protrudes from the end of the connecting seat 256 away from the camshaft 255, the side of the connecting seat 256 near the lower inner wall of the groove 254, and the side of the connecting seat 256 near the upper inner wall of the groove 254. Two retaining springs 2823 are fitted around the outer periphery of the positioning rod 282. The two through holes 25622 are located between the two retaining springs 2823, which limit the positioning rod 282 to prevent it from moving back and forth. A first receiving cavity is provided at the end of the rocker arm 283 away from the mounting portion 2832. A first mounting shaft, such as a pin, is provided through the front and rear inner walls of the first receiving cavity. The rocker arm bearing 2834 is housed in the first receiving cavity and sleeved on the outer periphery of the first mounting shaft. The rocker arm bearing 2834 extends out of the first receiving cavity, that is, the rocker arm bearing 2834 protrudes from the side of the rocker arm 283 near the lower inner wall of the groove 254, the side of the rocker arm 283 near the upper inner wall of the groove 254, and the end of the rocker arm 283 away from the mounting portion 2832. A retaining spring 28322 is sleeved on the outer periphery of the end of the mounting portion 2832 away from the rocker arm 283. The retaining spring 28322 limits the mounting portion 2832 to prevent the mounting portion 2832 from moving back and forth. The connecting block 284 has a second receiving cavity at the end that abuts against the bottom of the locking position 2852. A second mounting shaft is provided through the front and rear inner walls of the second receiving cavity. The connecting block bearing 2842 is housed within the second receiving cavity and sleeved on the outer circumference of the second mounting shaft. A portion of the connecting block bearing 2842 extends out of the second receiving cavity and abuts against the bottom of the locking position 2852. Specifically, a portion of the connecting block bearing 2842 protrudes from the side of the connecting block 284 near the lower inner wall of the groove 254, the side of the connecting block 284 near the upper inner wall of the groove 254, and the end of the connecting block 284 near the locking position 2852. The end of the connecting block 284 near the locking position 2852 is adapted to the locking position 2852. The connecting block bearing 2842 can form a sliding contact with the bottom of the locking position 2852 to avoid damage to the locking block 285.

[0039] Combination Figures 12 to 14 As shown, the shift fork mechanism 70 is located to the right of the winding needle 20. The shift fork mechanism 70 includes a shift fork mounting plate 72, a shift fork base plate 73 disposed on the rear side of the shift fork mounting plate 72, a shift fork drive unit 74 disposed on the side of the shift fork base plate 73 away from the shift fork mounting plate 72, a shift fork 75, and a laser sensor 76 disposed on the side of the shift fork base plate 73 away from the shift fork mounting plate 72.

[0040] The shift fork mounting plate 72 is used to mount on the frame of the winding machine. The shift fork 75 is connected to the shift fork drive unit 74. Specifically, the shift fork 75 and the shift fork drive unit 74 are arranged side by side. In this embodiment, the shift fork drive unit 74 is located above the shift fork 75. An L-shaped member 752 is provided at one end of the shift fork 75 near the shift fork drive unit 74. The L-shaped member 752 is located to the left of the shift fork drive unit 74. The shift fork drive unit 74 is a cylinder. The shift fork drive unit 74 is mounted on the side of the shift fork base plate 73 away from the shift fork mounting plate 72 through a cylinder seat 742. The output shaft 743 of the shift fork drive unit 74 is connected to the L-shaped member 752, so that the shift fork drive unit 74 can drive the shift fork 75 to move towards or away from the winding needle 20 through its output shaft 743.

[0041] The shift fork 75 is slidably connected to the side of the shift fork base plate 73 away from the shift fork mounting plate 72. Specifically, a guide rail 732 is provided on the side of the shift fork base plate 73 away from the shift fork mounting plate 72. The guide rail 732 is slidably engaged with the slider 733. The slider 733 is located on the side of the shift fork 75 near the shift fork base plate 73. Thus, the shift fork 75 is slidably connected to the side of the shift fork base plate 73 away from the shift fork mounting plate 72 through the guide rail 732 and the slider 733. The slider 733 and the guide rail 732 can improve the smoothness of the shift fork 75 movement.

[0042] One end of the shift fork 75 is provided with a fork 753. When the shift fork drive unit 74 drives the shift fork 75 to move towards or away from the winding needle 20, the positioning rod 282 and the swing rod 283 can be engaged or released through the fork 753. When the positioning rod 282 and the swing rod 283 are engaged through the fork 753, the end of the positioning rod 282 away from the connecting seat 256 extends out from the fork 753 and is located behind the shift fork 75. The positioning rod bearing 2822 contacts the lower inner wall of the fork 753, the swing rod bearing 2834 abuts against the upper inner wall of the fork 753, and the swing rod 283 abuts against the positioning rod 282. Figure 12 and Figure 13 As shown, the positioning rod bearing 2822 can form a sliding contact with the lower inner wall of the fork 753, and the rocker arm bearing 2834 can form a sliding contact with the inclined surface 7532 of the upper inner wall of the fork 753 and the upper inner wall of the fork 753 respectively, which can avoid damage to the positioning rod 282 and the rocker arm 283.

[0043] The upper and lower inner walls of the opening end of the fork 753 are respectively provided with two inclined surfaces 7532. The inclined surfaces 7532 serve as guides. When the fork 75 forks the positioning rod 282 and the rocker arm 283 through the fork 75 fork 75, when the fork 75 moves to the point where the opening of its fork 753 approaches the end of the rocker arm 283 away from the mounting part 2832, the rocker arm bearing 283 of the rocker arm 283 will first contact the inclined surface 7532 of the upper inner wall of the fork 753. As the fork 75 continues to move, under the action of the inclined surface 7532 of the upper inner wall of the fork 753 pressing the rocker arm bearing 2834, the rocker arm 283 will rotate relative to the connecting seat 256 towards the positioning rod 282 until the rocker arm 283 abuts against the positioning rod 282 and the rocker arm bearing 2834 abuts against the upper inner wall of the fork 753.

[0044] The laser sensor 76 is located behind the shift fork 75. The laser sensor 76 is set on the side of the shift fork base plate 73 away from the shift fork mounting plate 72 via the L-shaped block 762. The laser sensor 76 is used to detect the presence or absence of the positioning rod 282. When the laser sensor 76 detects the positioning rod 282, the shift fork drive unit 74 can drive the shift fork 75 to move towards the coil needle 20.

[0045] With the above structure, the working principle of the present invention is as follows: When winding and forming a battery cell, the winding shaft 14 is first driven forward by the moving drive mechanism 30, which in turn drives the fixed seat 12 and the winding needle 20 to move forward until the winding needle 20 passes through the area of ​​the fixed plate and reaches the unloading station. Then, the winding head drives the winding needle 20 to rotate from the unloading station to the winding station. Then, the moving drive mechanism 30 drives the winding needle 20 to move forward until the fixed positioning block 242 and the movable positioning block 252 of the winding needle 20 cooperate with the positioning hole of the positioning mechanism. At this time, the winding needle 20 can be used to wind and form a battery cell.

[0046] For example, when the winding diameter of the winding needle 20 needs to be adjusted to the maximum to adjust the alignment of the battery cell tabs, after the battery cell winding is completed, the winding needle 20 is first driven to move backward by the moving drive mechanism 30 until the fixed positioning block 242 and the movable positioning block 252 separate from the positioning hole of the positioning mechanism. Then, the winding head drives the winding needle 20 to rotate from the winding station to the unloading station for unloading. After unloading, the positioning rod 282 can be detected by the laser sensor 76. After the positioning rod 282 is detected by the laser sensor 76, the shift fork drive unit 74 drives the shift fork 75 to move towards the winding needle 20. In this way, the positioning rod 282 and the swing rod 283 can be held by the fork opening 753. Figure 1 , Figure 2 , Figure 11 , Figure 12As shown, during the process of the fork 753 forking the positioning rod 282 and the rocker arm 283, under the pressure of the inclined surface 7532 on the upper inner wall of the fork 753, the rocker arm 283 can rotate relative to the connecting seat 256 towards the positioning rod 282 until the rocker arm 283 abuts against the positioning rod 282 and the rocker arm bearing 2834 abuts against the upper inner wall of the fork 753. The rotation of the rocker arm 283 can drive the connecting block 284 to rotate. The rotation of the connecting block 284 can push the locking block 285 to move away from the locking member 286. At the same time, the locking elastic member 2853 is compressed. At this time, the end of the locking block 285 with the locking position 2852 separates from the lower end of the two teeth 2862 near the groove 254, thus unlocking is achieved, and the connecting seat 256, camshaft 255 and movable mounting seat 25 are separated. Then, the winding shaft 14 is driven to rotate to a predetermined position, for example, to the right, via a rotary drive mechanism. Since the positioning rod 282 and the swing rod 283 are held in place by the fork 753 of the shift fork 75, the rotation of the winding shaft 14 can drive the fixed seat 12, the fixed mounting seat 24, and the movable mounting seat 25 to rotate to the predetermined position. However, the connecting seat 256 and the camshaft 255 will not rotate with the movable mounting seat 25; that is, the connecting seat 256 and the camshaft 255 are fixed. The rotation of the fixed mounting seat 24 can drive the fixed needle winding component 22 to rotate, and the rotation of the movable mounting seat 25 can drive the base plate 26 and the movable needle winding component 23 to rotate. During the rotation, since the camshaft 255 is fixed, the rolling element 264 can rotate on the outer circumference of the corresponding eccentric block 2552 under the drive of the base plate 26. It can also move along the circumference of the eccentric block 2552 towards the lower end of the corresponding eccentric block 2552 until the rolling element 264 contacts the middle of the corresponding eccentric block 2552. During the movement of the rolling element 264, the rolling element 264 can drive the base plate 26 and the movable needle winding component 23 away from the fixed needle winding component 22. In this way, the distance between the movable needle winding component 23 and the fixed needle winding component 22 increases, and the winding diameter of the needle winding 20 is adjusted to the maximum. After completion, the shift fork drive unit 74 drives the shift fork 75 to move away from the winding needle 20 to the initial position. At this time, since the positioning rod 282 and the swing rod 283 are not forked, the locking elastic element 2853 is reset. The locking elastic element 2853 can push the locking block 285 to move towards the teeth 2862 of the locking element 286 until the end of the locking block 285 with the locking position 2852 abuts against the middle of the two teeth 2862. The movement of the locking block 285 can drive the connecting block 284 and the swing rod 283 to rotate away from the positioning rod 282 to the initial position. In this way, the connecting seat 256, the camshaft 255 and the movable mounting seat 25 are locked together again. Then the winding and forming process can be carried out. In this way, when winding and forming the next battery cell, the alignment of the battery cell tabs can be adjusted, thereby achieving the purpose of correcting the misalignment of the battery cell tabs.

[0047] If the diameter of the winding needle 20 needs to be reduced after it has been adjusted to its maximum, the winding needle 20 is moved backward by the moving drive mechanism 30 until the fixed positioning block 242 and the movable positioning block 252 are separated from the positioning hole of the positioning mechanism. Then, the positioning rod 282 is detected by the laser sensor 76. After the positioning rod 282 is detected by the laser sensor 76, the shift fork drive unit 74 drives the shift fork 75 to move towards the winding needle 20. In this way, the positioning rod 282 and the swing rod 283 can be caught by the fork opening 753, thereby unlocking and separating the connecting seat 256 from the movable mounting seat 25. Then, the winding shaft 14 is driven by a rotary drive mechanism to rotate to the left to the initial position or to the right to the predetermined position. This drives the fixed seat 12, fixed mounting seat 24, movable mounting seat 25, fixed needle winding component 22, base plate 26, and movable needle winding component 23 to rotate to the predetermined position. During the rotation of the base plate 26, the rolling element 264 can rotate on the outer circumferential surface of the corresponding eccentric block 2552, i.e., rotate on its own axis, and can move along the circumference of the eccentric block 2552 towards the upper end of the corresponding eccentric block 2552 or towards... The rolling element 264 moves towards the lower end of the corresponding eccentric block 2552 until it contacts the upper or lower end of the corresponding eccentric block 2552. When the rolling element 264 contacts the lower end of the corresponding eccentric block 2552, the connecting seat 256 approaches the upper inner wall of the groove 254. During the movement of the rolling element 264, the rolling element 264 can drive the base plate 26 and the movable needle winding member 23 to approach the fixed needle winding member 22. In this way, the distance between the movable needle winding member 23 and the fixed needle winding member 22 is reduced, and the winding diameter of the needle winding 20 is adjusted to the minimum. After completion, the shift fork drive unit 74 drives the shift fork 75 to move away from the coiling needle 20 to the initial position. At this time, since the positioning rod 282 and the rocker arm 283 are not forked, the locking elastic element 2853 is reset. The locking elastic element 2853 can push the locking block 285 to move towards the teeth 2862 of the locking element 286 until the end of the locking block 285 with the locking position 2852 abuts against the lower end of the two teeth 2862 or the upper end of the two teeth 2862 abuts against each other. The movement of the locking block 285 can drive the connecting block 284 and the rocker arm 283 to rotate away from the positioning rod 282 to the initial position. In this way, the connecting seat 256, the camshaft 255 and the movable mounting seat 25 are locked together again, and then the winding forming process can be carried out.

[0048] The above lists the ways to adjust the winding diameter of the winding needle 20 to the maximum and minimum. The steps to adjust the winding diameter of the winding needle 20 to a value between the maximum and minimum are the same as the steps above. When actually adjusting the winding diameter of the winding needle 20, the winding diameter of the winding needle 20 can be adjusted according to the misalignment of the electrode tabs of the previous cell.

[0049] In other embodiments, without using the shift fork mechanism 70, the rocker arm 283 can be manually rotated to a position where it abuts against the positioning rod 282 to unlock. Then, the connecting seat 256 can be manually pushed to move towards the upper inner wall of the groove 254. The movement of the connecting seat 256 can drive the camshaft 255 to rotate. The rotation of the camshaft 255 can drive the eccentric block 2552 to rotate. In this way, the eccentric block 2552 can drive the corresponding rolling element 264 to rotate on its outer circumference and move along its circumference towards its lower end. In this way, the rolling element 264 can also drive the base plate 26 and the movable needle winding member 23 to move away from or towards the fixed needle winding member 22, which can also change the winding diameter of the needle winding 20.

[0050] The present invention, through the setting of the winding needle 20, eliminates the need for manual intervention such as unwinding the winding needle 20 when adjusting its winding diameter, which is time-saving, improves equipment efficiency and utilization rate, reduces labor costs, and reduces the scrap rate of battery cells.

[0051] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A variable diameter needle winding device, comprising a needle winding mechanism, a moving drive mechanism, and a rotating drive mechanism, wherein the needle winding mechanism includes a fixed base, a needle, and a winding shaft, the needle and the winding shaft being respectively disposed at a first end and a second end of the fixed base, and the winding shaft being respectively connected to the moving drive mechanism and the rotating drive mechanism, characterized in that, The needle winding includes a fixed needle winding component and a movable needle winding component arranged opposite to each other, and the fixed needle winding component and the movable needle winding component are respectively provided with a fixed mounting groove and a movable mounting groove on their adjacent sides; The fixed mounting slot is provided with a fixed mounting base, one end of which extends out of the fixed mounting slot and is disposed at the first end of the fixed mounting base; The movable mounting slot contains a movable mounting seat and a base plate. One end of the movable mounting seat extends out of the movable mounting slot and is located at the first end of the fixed seat. The movable mounting seat is rotatably equipped with a camshaft, and the camshaft and the movable mounting seat can rotate relative to each other. An eccentric block is provided on the outer circumferential surface of the camshaft. The base plate is located between the bottom of the movable mounting seat and the bottom of the movable mounting slot and is located at the bottom of the movable mounting slot. The base plate is provided with a guide post and a rolling element. The movable mounting seat is provided with a sliding bearing. The guide post is connected to the movable mounting seat through the sliding bearing. The rolling element contacts the bottom of the movable mounting slot and one end of the eccentric block, respectively. The rolling element can rotate on the outer circumferential surface of the eccentric block and can move along the circumference of the eccentric block between the two ends of the eccentric block. The movement of the rolling element can drive the movable needle coiling component and the base plate away from or towards the fixed needle coiling component.

2. The needle winding device according to claim 1, characterized in that, The movable mounting base has a receiving groove and a recess on the side near the base plate. The recess is located between the fixed base and the movable coiling part and accommodates a connecting seat. The connecting seat protrudes from the side of the movable mounting base near the base plate and is inclined relative to the movable mounting base. The camshaft is rotatably disposed in the receiving groove, and one end of the camshaft extends into the recess and is connected to one end of the connecting seat.

3. The needle winding device according to claim 2, characterized in that, The connecting seat is provided with a locking structure, which includes a positioning rod, a swing rod, a connecting block, a locking block and two arc-shaped locking parts; The positioning rod is rotatably provided at the end of the connecting seat away from the camshaft; The swing arm is inclined relative to the connecting seat. One end of the swing arm has a mounting part. The swing arm is rotatably connected to the connecting seat through the mounting part. The swing arm corresponds to the positioning rod and has a gap with the positioning rod. The swing arm can rotate relative to the connecting seat in a direction closer to or away from the positioning rod. When the swing arm rotates in a direction closer to the positioning rod, the swing arm abuts against the positioning rod. The connecting block is housed in the mounting cavity of the connecting seat, the locking block extends through the mounting cavity, one end of the locking block has a locking position, and the other end is connected to the bottom of the mounting cavity by a locking elastic element. One end of the connecting block is connected to the mounting part, and the other end abuts against the bottom of the locking position. Both locking components are disposed within the groove, the connecting seat is located between the two locking components, and the two locking components protrude from the side of the movable mounting seat near the base plate. The inner circumferential surfaces of the two locking components are respectively provided with two teeth, the locking position is located between the two teeth, and the locking end of the locking block abuts against one end of the two teeth.

4. The needle winding device according to claim 3, characterized in that, The connecting seat has a cavity at the end away from the camshaft. Two through holes are provided on the inner walls of the two sides of the cavity. The positioning rod is movably inserted through the two through holes and a positioning rod bearing is sleeved on its outer periphery. The positioning rod bearing is housed in the cavity and extends out of the cavity. A rocker arm bearing is rotatably provided at the end of the rocker arm away from the mounting part.

5. The needle winding device according to claim 3, characterized in that, A connecting block bearing is rotatably provided at one end of the connecting block that abuts against the bottom of the locking position, and the connecting block bearing abuts against the bottom of the locking position.

6. The needle winding device according to claim 4, characterized in that, The needle winding device further includes a shift fork mechanism located on one side of the needle winding. The shift fork mechanism includes a shift fork mounting plate, a shift fork base plate disposed on one side of the shift fork mounting plate, a shift fork drive unit disposed on the side of the shift fork base plate away from the shift fork mounting plate, and a shift fork. The shift fork is connected to the shift fork drive unit and is slidably connected to the side of the shift fork base plate away from the shift fork mounting plate. One end of the shift fork is provided with a fork opening. The shift fork drive unit is used to drive the shift fork to move towards or away from the needle winding, so as to engage or release the positioning rod and the swing rod through the fork opening. When the positioning rod and the swing rod are engaged through the fork opening, the end of the positioning rod away from the connecting seat extends out from the fork opening. The positioning rod bearing contacts the inner wall of one side of the fork opening, the swing rod bearing abuts against the inner wall of the other side of the fork opening, and the swing rod abuts against the positioning rod.

7. The needle winding device according to claim 6, characterized in that, The shift fork mechanism also includes a laser sensor, which is disposed on the side of the shift fork base plate away from the shift fork mounting plate. The laser sensor is used to detect the presence or absence of the positioning rod.

8. The needle winding device according to claim 1, characterized in that, The sliding bearing is an oil-free bushing.

9. The needle winding device according to claim 1, characterized in that, There is a gap between the base plate and the movable mounting seat. A through groove is provided on the side of the base plate near the movable mounting seat. A rolling mounting seat is provided in the through groove. The rolling element is located in the through groove and is mounted on the rolling mounting seat.

10. The needle winding device according to claim 1, characterized in that, The movable mounting base is equipped with a guide fastener, one end of which is movably inserted into the guide hole of the base plate.

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