Reducing winding needle

Abstract

The utility model relates to a variable-diameter winding needle, which comprises an outer needle, an inner needle, a locking nozzle and a transmission block, the outer needle is movably arranged in the outer circumferential direction of the inner needle, the inner needle is provided with a guide sleeve along the radial direction, the outer needle is connected with a mounting seat, and a guide post penetrating through the guide sleeve is fixed on the mounting seat; the transmission block is arranged on one side of the inner needle in parallel, the transmission block is fixedly connected with a variable-diameter inclined block, a sliding groove is formed in the variable-diameter inclined block, and a guide bearing arranged in the sliding groove in a penetrating mode is arranged on the installation base; the lock nozzle is coaxially arranged in the drawing and inserting direction of the inner needle and cooperates with the transmission block; the locking mouth pushes the transmission block to move in the length direction of the inner needle so as to drive the variable-diameter inclined block to move relative to the inner needle, and the variable-diameter inclined block pushes the installation base and the outer needle to move relative to the inner needle in the radial direction through the sliding groove and the guide bearing under limiting of the guide column and the guide sleeve. According to the utility model, automatic diameter changing of the winding needle is realized, tabs of positive and negative pole pieces are aligned, and the production efficiency and quality of a battery cell are improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery cell winding technology, and in particular to a variable diameter winding needle. Background Technology

[0002] In the process of manufacturing battery cells using a lithium battery winding machine, the electrode sheets and separator need to be wound into a cell according to requirements through a series of actions of the winding head module. The winding needle structure in the winding head module is one of the more important components, as it directly affects the alignment of the positive and negative electrode tabs. Existing winding needles mostly have a fixed diameter, resulting in a fixed inner circumference of the battery cell. During the winding process, the electrode tabs cut by laser will have a certain cumulative error. Combined with the influence of electrode thickness, this can lead to situations where the alignment of the positive and negative electrode tabs does not meet the quality requirements of the battery cell, affecting the yield rate. Current production lines often adjust the diameter of the winding needle by wrapping a corresponding thickness of Teflon tape around it according to the error of the positive and negative electrode tabs. However, this method cannot be adjusted in real time, is time-consuming and labor-intensive, and has poor adjustment accuracy, affecting the production efficiency and quality of the battery cells.

[0003] Therefore, it is necessary to design a winding needle that can automatically change its diameter to solve the problem of alignment of the positive and negative electrode tabs caused by the cumulative error of laser cutting. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a variable diameter coiling needle.

[0005] This utility model provides a variable diameter coiled needle, including an outer needle, an inner needle, a locking nozzle, and a transmission block. The outer needle is movably disposed on the outer circumference of the inner needle. The inner needle is radially provided with a guide sleeve. The outer needle is connected to a mounting base, and a guide post passing through the guide sleeve is fixed to the mounting base. The transmission block is disposed parallel to one side of the inner needle and is connected to a variable diameter inclined block. The variable diameter inclined block is provided with a sliding groove, the direction of which is not parallel to the length direction of the inner needle. A guide bearing passing through the sliding groove is provided on the mounting base. The locking nozzle is coaxially disposed in the insertion / extraction direction of the inner needle and cooperates with the transmission block. The locking nozzle pushes the transmission block to move along the length direction of the inner needle, thereby driving the variable diameter inclined block to move relative to the inner needle. Under the limitation of the guide post and the guide sleeve, the variable diameter inclined block pushes the mounting base and the outer needle to move radially relative to the inner needle through the sliding groove and the guide bearing.

[0006] In some embodiments, a guide post is vertically disposed at both ends of the mounting base, and the length of the guide post is greater than the length of the guide sleeve.

[0007] In some embodiments, the inner needle is provided with a first mounting hole in the radial direction, and the guide sleeve is coaxially fixed in the first mounting hole.

[0008] In some embodiments, the inner needle is provided with a second mounting hole in the radial direction, and a bolt fixedly connected to the mounting base is provided in the second mounting hole. A first return spring is sleeved on the bolt, and the two ends of the first return spring act on the bolt and the inner needle respectively.

[0009] In some embodiments, the inner needle is provided with a first clearance groove at the diameter-changing inclined block, and the mounting base is provided with a second clearance groove at the diameter-changing inclined block, the first clearance groove and the second clearance groove are connected; the inner needle is provided with a concave surface at the guide bearing, and the mounting base is provided with a corresponding protrusion, the guide bearing is mounted on the protrusion.

[0010] In some embodiments, the variable diameter swash block is fixed to the transmission block at the middle, and the two ends of the variable diameter swash block with the groove are higher than the inner pin and cooperate with the guide bearing of the mounting base.

[0011] In some embodiments, the inner needle is fixed with a guide rail, and the transmission block is correspondingly provided with a guide groove. The transmission block is slidably connected to the inner needle through the guide rail and the guide groove. A second return spring is provided between the transmission block and the inner needle. The second return spring is provided along the length direction of the inner needle and is sleeved on the pin of the transmission block.

[0012] In some embodiments, the locking nozzle is provided with a socket, the end of the inner pin is provided with a plug that mates with the socket, and the transmission block extends to the plug. During the insertion of the plug into the socket, the end face of the locking nozzle contacts the end face of the transmission block to push the transmission block to move relative to the inner pin.

[0013] In some embodiments, the inner needle has two mounting seats symmetrically arranged in the radial direction, and the two mounting seats are fixedly connected to two outer needles respectively, with the two outer needles surrounding the outer circumference of the inner needle.

[0014] In some embodiments, the outer needle is provided with an air hole, which is connected to an external air source through an air passage and a connector.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: by the transmission block moving along the length direction of the inner needle and the cooperation of the sliding groove and guide bearing in the inclined variable diameter block, the displacement of the transmission block in the length direction of the inner needle is converted into the displacement of the outer needle in the radial direction. The outer needle and the inner needle are guided by the guide post and the guide sleeve, so that the outer needle can stably move away from or closer to the inner needle in the radial direction, realizing the automatic diameter change of the coiled needle, thereby correcting the position deviation of the positive and negative electrode tabs caused by the cumulative error of the laser cutting process in real time, aligning the positive and negative electrode tabs, and improving the production efficiency and quality of the battery cell. Attached Figure Description

[0016] Figure 1This is a three-dimensional structural diagram of the variable diameter coiling needle after removing one outer needle, according to an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the left-side structure of the variable diameter coiling needle according to an embodiment of this application.

[0018] Figure 3 This is a top view of the variable diameter coil needle according to an embodiment of this application.

[0019] Figure 4 This is a right-side structural schematic diagram of the variable diameter coil needle according to an embodiment of this application.

[0020] Figure 5 This is a cross-sectional structural diagram of the variable diameter coil needle according to an embodiment of this application.

[0021] Attached reference numerals: 1. Locking nozzle; 11. Socket;

[0022] 2. Inner pin; 21. Plug; 22. First mounting hole; 23. Second mounting hole; 24. First clearance groove; 25. Concave surface; 26. Guide rail; 27. Connecting block; 28. Guide sleeve;

[0023] 3. Transmission block; 31. Guide groove; 32. Second return spring; 33. Pin; 34. Adjusting screw;

[0024] 4. Variable diameter inclined block; 41. Sliding groove;

[0025] 5. External needle; 51. Air hole; 52. Connector;

[0026] 6. Mounting base; 61. Guide post; 62. Guide bearing; 63. Bolt; 64. First return spring; 65. Second clearance groove; 66. Protrusion;

[0027] 7. Fixture. Detailed Implementation

[0028] The specific embodiments of this utility model are described with reference to the accompanying drawings.

[0029] refer to Figure 1 The figure shows a three-dimensional structural diagram of a variable diameter coiled needle after removing one outer needle 5. The bottom of the figure is the locking mouth 1, and the middle of the figure is the inner needle 2 and the outer needle 5. The inner needle 2 is fixed on the upper fixing seat 7. The fixing seat 7 is connected to the winding machine. The fixing seat 7, the inner needle 2, and the outer needle 5 together perform the needle insertion and needle withdrawal actions. The outer needle 5 moves radially relative to the inner needle 2. When inserting the needle, the diameter of the entire variable diameter coiled needle increases, and when withdrawing the needle, the diameter of the entire variable diameter coiled needle decreases, so that the variable diameter coiled needle can change its diameter in real time.

[0030] refer to Figures 1 to 5A variable diameter coiled needle includes an outer needle 5, an inner needle 2, a locking nozzle 1, and a transmission block 3. The outer needle 5 is movably disposed on the outer circumference of the inner needle 2. The inner needle 2 is provided with a guide sleeve 28 along the radial direction. The outer needle 5 is connected to a mounting base 6, and the mounting base 6 is fixed with a guide post 61 passing through the guide sleeve 28. The transmission block 3 is disposed parallel to one side of the inner needle 2 and is connected to a variable diameter inclined block 4. The variable diameter inclined block 4 is provided with a sliding groove 41, the direction of which is not parallel to the length direction of the inner needle 2. The mounting base 6 is provided with a guide bearing 62 passing through the sliding groove 41. The locking nozzle 1 is coaxially disposed in the insertion and withdrawal direction of the inner needle 2 and cooperates with the transmission block 3. The locking nozzle 1 pushes the transmission block 3 to move along the length direction of the inner needle 2, thereby driving the variable diameter inclined block 4 to move relative to the inner needle 2. Under the limitation of the guide post 61 and the guide sleeve 28, the variable diameter inclined block 4 pushes the mounting base 6 and the outer needle 5 to move radially relative to the inner needle 2 through the sliding groove 41 and the guide bearing 62.

[0031] The variable diameter coiling needle of this application, through the cooperation of the transmission block 3 moving along the length direction of the inner needle 2 and the sliding groove 41 inclined in the variable diameter inclined block 4 and the guide bearing 62, converts the displacement of the transmission block 3 in the length direction of the inner needle 2 into the radial displacement of the outer needle 5. The outer needle 5 and the inner needle 2 are guided by the guide post 61 and the guide sleeve 28, so that the outer needle 5 can stably move away from or closer to the inner needle 2 in the radial direction, realizing the automatic diameter change of the variable diameter coiling needle, thereby correcting the positional deviation of the positive and negative electrode tabs caused by the cumulative error of the laser cutting process in real time, aligning the positive and negative electrode tabs, and improving the production efficiency and quality of the battery cell.

[0032] To ensure stable radial movement of the mounting base 6 and the outer pin 5, in this embodiment, reference is made to... Figure 5 A guide post 61 is vertically installed at both ends of the mounting base 6, and the length of the guide post 61 is greater than the length of the guide sleeve 28.

[0033] Understandably, with this setup, the guide sleeve 28 is fixed to the inner needle 2 and moves together with the inner needle 2. The guide post 61 moves radially together with the mounting base 6 and the outer needle 5. The two guide posts 61 at both ends of the mounting base 6 ensure that both ends of the mounting base 6 and the outer needle 5 are guided by the guide posts 61, thereby ensuring that the mounting base 6 and the outer needle 5 can move smoothly in the radial direction. The length of the guide post 61 is greater than the length of the guide sleeve 28. When the outer needle 5 moves away from the inner needle 2, the guide post 61 will not detach from the guide sleeve 28, ensuring that the guide post 61 is always connected to the guide sleeve 28.

[0034] In order to install the guide sleeve 28, in this embodiment, refer to Figure 1 and Figure 5 The inner needle 2 is provided with a first mounting hole 22 along the radial direction, and the guide sleeve 28 is coaxially fixed in the first mounting hole 22.

[0035] Understandably, with this configuration, the guide sleeve 28 is fixed in the middle of the first mounting hole 22, the outer wall of the guide sleeve 28 is press-fitted with the inner wall of the first mounting hole 22, neither end of the guide sleeve 28 is higher than the first mounting hole 22, and the inner needle 2 passes through the first mounting hole 22, ensuring that the longer guide post 61 has enough room for expansion and contraction.

[0036] To prevent the outer needle 5 from shaking, in this embodiment, reference is made to... Figure 5 The inner needle 2 is provided with a second mounting hole 23 in the radial direction. A bolt 63 is provided in the second mounting hole 23 and is fixedly connected to the mounting base 6. A first return spring 64 is sleeved on the bolt 63. The two ends of the first return spring 64 act on the bolt 63 and the inner needle 2 respectively.

[0037] Understandably, with this configuration, both ends of the mounting base 6 are equipped with a bolt 63 that houses the first return spring 64. The elastic force of the first return spring 64 can pull the mounting base 6 and the outer needle 5 towards the inner needle 2, allowing the mounting base 6 and the outer needle 5 to be close to the inner needle 2. This prevents the outer needle 5 from wobbling radially, ensuring that the diameter of the variable diameter winding needle remains stable when winding the battery cell, thus guaranteeing the quality and consistency of the battery cell. At the same time, when the diameter of the variable diameter winding needle needs to be reduced, the elastic force of the two first return springs 64 can quickly pull the mounting base 6 and the outer needle 5 towards the inner needle 2, allowing the outer needle 5 to return to its original position.

[0038] To ensure that the variable-diameter inclined block 4 has a sufficient range of motion, in this embodiment, reference is made to... Figure 1 and Figure 5 The inner needle 2 is provided with a first clearance groove 24 at the variable diameter inclined block 4, and the mounting base 6 is provided with a second clearance groove 65 at the variable diameter inclined block 4. The first clearance groove 24 and the second clearance groove 65 are connected. The inner needle 2 is provided with a concave surface 25 at the guide bearing 62, and the mounting base 6 is provided with a corresponding protrusion 66. The guide bearing 62 is mounted on the protrusion 66.

[0039] Understandably, this configuration provides sufficient moving space for the variable diameter swash block 4 through the first clearance groove 24 and the second clearance groove 65. The mounting base 6 has a protrusion 66 in the direction of the inward pin 2 to ensure that the guide bearing 62 has sufficient mounting position, so that the transmission between the variable diameter swash block 4 and the guide bearing 62 is stable.

[0040] To ensure a tight fit between the guide bearing 62 and the variable diameter swash block 4, in this embodiment, reference is made to... Figure 1 and Figure 5 The variable diameter inclined block 4 is fixed to the transmission block 3 in the middle. The variable diameter inclined block 4 is provided with a groove 41 at both ends that are higher than the inner needle 2 and cooperate with the guide bearing 62 of the mounting seat 6.

[0041] Understandably, this configuration, with the variable diameter swashplate 4 extending into the mounting base 6, ensures sufficient design and installation space for the guide bearing 62 and the slide groove 41. This allows for the use of guide bearings 62 and variable diameter swashplate 4 with better structural strength, ensuring a tight fit between them.

[0042] In order to ensure a tight fit between the transmission block 3 and the inner needle 2, in this embodiment, reference is made to... Figure 1 and Figure 3 The inner needle 2 is fixed with a guide rail 26, and the transmission block 3 is correspondingly provided with a guide groove 31. The transmission block 3 is slidably connected to the inner needle 2 through the guide rail 26 and the guide groove 31. A second return spring 32 is provided between the transmission block 3 and the inner needle 2. The second return spring 32 is provided along the length direction of the inner needle 2 and is sleeved on the pin 33 of the transmission block 3.

[0043] It should be further explained that the inner needle 2 is provided with a connecting block 27 near the fixed seat 7. The connecting block 27 has a slot, and one end of the second return spring 32 is installed in the slot, so that the second return spring 32 acts on the inner needle 2 and the transmission block 3.

[0044] Understandably, this setup guides the connecting block 27 via the guide rail 26 and guide groove 31, ensuring that the transmission block 3 can move stably in a straight line on one side of the inner needle 2, and that the variable diameter inclined block 4 can move stably along the guide rail 26 along with the transmission block 3. When the battery cell is unloaded, the transmission block 3 is quickly reset by the elastic force of the second reset spring 32, so that the variable diameter coil needle can be quickly reset to the smallest diameter state, which facilitates the unloading of the battery cell.

[0045] To ensure a tight fit between the transmission block 3 and the locking nozzle 1, in this embodiment, reference is made to... Figure 3 and Figure 5 The locking nozzle 1 is provided with a socket 11, and the end of the inner needle 2 is provided with a plug 21 that matches the socket 11. The transmission block 3 extends to the plug 21. During the process of the plug 21 being inserted into the socket 11, the end face of the locking nozzle 1 contacts the end face of the transmission block 3 to push the transmission block 3 to move relative to the inner needle 2.

[0046] Understandably, with this setup, when the variable diameter coiled needle is inserted, the plug 21 of the inner needle 2 is first inserted into the socket 11 of the locking nozzle 1, which serves as a guide to ensure that the variable diameter coiled needle and the locking nozzle 1 are accurately aligned. At the same time, it guides the transmission block 3 to be accurately aligned with the locking nozzle 1. As the plug 21 of the inner needle 2 continues to be inserted into the socket 11, the end face of the transmission block 3 will contact the end face of the locking nozzle 1. Then, the locking nozzle 1 pushes the transmission block 3 to move relative to the inner needle 2, thus changing the diameter of the variable diameter coiled needle.

[0047] To enable better diameter changes in the variable-diameter coiling needle, in this embodiment, reference is made to... Figure 5The inner needle 2 has two mounting seats 6 symmetrically arranged in the radial direction. The two mounting seats 6 are fixedly connected to the two outer needles 5 respectively. The two outer needles 5 surround the outer circumference of the inner needle 2.

[0048] Understandably, with this configuration, the transmission block 3 drives the two mounting seats 6 to move simultaneously through the variable diameter inclined block 4, causing the two outer needles 5 to move away from or closer to the inner needle 2 in sync, so that the axis of the variable diameter winding needle remains unchanged, ensuring the winding quality of the battery cell.

[0049] In order for the variable diameter needle roll to adsorb the diaphragm, in this embodiment, reference is made to... Figure 1 The outer needle 5 is provided with an air hole 51, which is connected to an external air source through an air passage and a connector 52.

[0050] Understandably, with this setup, the air vent 51 generates negative pressure through an external air source, thereby adsorbing the diaphragm. During the process of the variable diameter winding needle changing from the unloading station to the winding station, the variable diameter winding needle adsorbs the diaphragm through the air vent 51, enabling the variable diameter winding needle to drive the diaphragm to pre-wind.

[0051] It needs to be further explained that during the electrode feeding process of the winding machine, the position of the electrode tabs is detected. When the position of the electrode tabs deviates, and the deviation can be corrected by adjusting the diameter of the variable diameter winding needle, the variable diameter winding needle is adjusted to adjust its diameter during winding. The adjustment can be automatic or manual. The automatic adjustment is achieved by adjusting the depth of the insertion of the plug 21 of the inner needle 2 into the insertion hole 11 of the locking nozzle 1. The deeper the insertion into the insertion hole 11, the more the locking nozzle 1 pushes the transmission block 3 to move. The longer the radial movement of the mounting base 6 and the outer needle 5 is driven by the variable diameter inclined block 4 and the guide bearing 62, the greater the increase in the diameter of the variable diameter winding needle. Conversely, the shallower the insertion of the plug 21 into the insertion hole 11, the shorter the radial movement of the outer needle 5, and the less the increase in the diameter of the variable diameter winding needle. This corrects the deviation in the position of the positive and negative electrode tabs caused by the cumulative error of laser cutting in real time, aligns the electrode tabs of the positive and negative electrode sheets, and performs closed-loop control on the alignment of the electrode tabs of the positive and negative electrode sheets. When the diameter of the variable-diameter coiling needle does not need to be adjusted during winding, the depth to which the inner needle 2 plug 21 inserts into the socket 11 is the same each time the variable-diameter coiling needle is inserted, ensuring that the winding diameter of the variable-diameter coiling needle is always the same. This can be achieved manually by adjusting the distance between the variable-diameter wedge block 4 and the transmission block 3. By turning the adjusting screw 34 between the variable-diameter wedge block 4 and the transmission block 3, the initial position of the variable-diameter wedge block 4 is adjusted. Then, the guide bearing 62 drives the outer needle 5 to change its initial position, so that when the variable-diameter coiling needle inserts a needle, the winding diameter of the variable-diameter coiling needle changes accordingly without changing the depth to which the inner needle 2 plug 21 inserts into the socket 11. Of course, when it is not necessary to manually adjust the winding diameter of the variable-diameter coiling needle, the variable-diameter wedge block 4 can be directly fixed to the transmission block 3.

[0052] The operating principle of this embodiment is as follows: When the variable diameter winding needle begins to insert the needle, it extends towards the locking nozzle 1. The plug 21 of the inner needle 2 contacts and aligns with the insertion hole 11 of the locking nozzle 1. The variable diameter winding needle continues to extend towards the locking nozzle 1, and the locking nozzle 1 contacts the transmission block 3, causing the second return spring 32 of the transmission block 3 to be compressed. During the movement of the transmission block 3, the variable diameter inclined block 4 moves along with the transmission block 3, causing the position of the guide bearing 62 and the variable diameter inclined block 4 to change. Under the guidance of the slide groove 41, the guide bearing 62 drives the mounting seat 6 and the outer needle 5 to move away from the inner needle 2. When the designated position is reached, the variable diameter winding needle stops moving, the diameter of the variable diameter winding needle is determined, and the battery cell is wound. After the battery cell is wound, the variable diameter winding needle begins to withdraw the needle. The variable diameter winding needle retracts, and the second return spring 32 of the transmission block 3 pushes the transmission block 3 to return to the initial position. Through the variable diameter inclined block 4 and the guide bearing 62, the outer needle 5 and the mounting seat 6 are driven closer to the inner needle 2, so that the diameter of the variable diameter winding needle becomes smaller, which facilitates the unloading of the battery cell.

[0053] The above does not limit the technical scope of this utility model. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A variable diameter spool needle characterized by, The application relates to a needle device, which comprises an outer needle, an inner needle, a lock mouth, and a transmission block, wherein the outer needle is movably arranged in the circumferential direction of the inner needle, the inner needle is provided with a guide sleeve in the radial direction, the outer needle is connected with a mounting seat, the mounting seat is fixedly provided with a guide column penetrating through the guide sleeve, the transmission block is arranged in parallel to one side of the inner needle, the transmission block is connected with a variable-diameter inclined block, the variable-diameter inclined block is provided with a sliding groove, the sliding groove is not parallel to the length direction of the inner needle, the mounting seat is provided with a guide bearing penetrating through the sliding groove, the lock mouth is coaxially arranged in the inserting direction of the inner needle and cooperates with the transmission block, the lock mouth pushes the transmission block to move along the length direction of the inner needle, so as to drive the variable-diameter inclined block to move relative to the inner needle, and under the limiting of the guide column and the guide sleeve, the variable-diameter inclined block pushes the mounting seat and the outer needle to move relative to the inner needle in the radial direction through the sliding groove and the guide bearing.

2. The variable diameter quill according to claim 1, wherein, The two ends of the mounting seat are vertically provided with guide columns, and the length of the guide column is longer than that of the guide sleeve.

3. The variable diameter quill according to claim 1, wherein, The inner needle is provided with a first mounting hole in the radial direction, and the guide sleeve is coaxially fixed in the first mounting hole.

4. The variable diameter spool as in claim 1, wherein, The inner needle is provided with a second mounting hole in the radial direction, the second mounting hole is provided with a bolt fixedly connected with the mounting seat, the bolt is sleeved with a first reset spring, and the two ends of the first reset spring are respectively applied to the bolt and the inner needle.

5. The variable diameter spool as in claim 1, wherein, The inner needle is provided with a first avoiding groove at the variable-diameter inclined block, the mounting seat is provided with a second avoiding groove at the variable-diameter inclined block, and the first avoiding groove and the second avoiding groove are communicated; the inner needle is provided with a concave surface at the guide bearing, and the mounting seat is correspondingly provided with a convex block, and the guide bearing is mounted on the convex block.

6. The variable gauge spool as in claim 1, wherein, The middle part of the variable-diameter inclined block is fixed with the transmission block, and the two ends of the variable-diameter inclined block are higher than the inner needle and cooperate with the guide bearings of the mounting seat.

7. The variable gauge spool as in claim 1, wherein, The inner needle is fixed with a guide rail, the transmission block is correspondingly provided with a guide groove, the transmission block is slidably connected with the inner needle through the guide rail and the guide groove, a second reset spring is arranged between the transmission block and the inner needle, and the second reset spring is arranged in the length direction of the inner needle and sleeved on a pin of the transmission block.

8. The variable gauge spool as in claim 1, wherein, The lock mouth is provided with a plug hole, the end of the inner needle is provided with a plug matched with the plug hole, the transmission block extends to the plug, and the end surface of the lock mouth is in contact with the end surface of the transmission block in the process that the plug is inserted into the plug hole, so as to push the transmission block to move relative to the inner needle.

9. The variable gauge spool as in claim 1, wherein, The inner needle is symmetrically provided with two mounting seats in the radial direction, the two mounting seats are respectively fixedly connected with two outer needles, and the two outer needles are arranged in the circumferential direction of the inner needle.

10. The variable gauge spool as in claim 9, wherein, The outer needle is provided with an air hole, and the air hole is connected with an air source through an air path and a joint.

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