Coating with a transfer device

Abstract

The utility model belongs to lithium ion battery pole piece preparation technical field discloses a kind of shift paste devices for coating including piston cylinder, piston, needle and filter assembly;Piston is movably arranged in piston cylinder;Filter assembly includes connecting seat, puller and filter screen;Connecting seat is opened with intercommunication passage along first direction;Piston cylinder is connected with needle through connecting seat, and piston cylinder, intercommunication passage and needle are sequentially communicated;Sliding groove, which is communicated with intercommunication passage, is opened in connecting seat along second direction, and first direction and second direction intersect;Filter screen is arranged on puller, and puller is sealingly slidably arranged in sliding groove;Filter screen has first position and second position, when filter screen is in first position, filter screen is located at intercommunication passage, when filter screen is in second position, filter screen is staggered with intercommunication passage.The shift paste device for coating can accurately control the volume of slurry transferred to current collector.

Description

Technical Field

[0001] This utility model belongs to the field of lithium-ion battery electrode preparation technology, specifically relating to a coating transfer device. Background Technology

[0002] In recent years, with the rapid development of the portable electronic device industry and the meteoric rise of new energy technologies and new energy vehicles, the demand for lithium-ion batteries has shown a significant growth trend. As a key core component of lithium-ion batteries, the quality of the electrode sheets directly affects the battery's electrochemical and safety performance. In the electrode sheet manufacturing process, slurry coating is a crucial step following slurry preparation. The core purpose of this step is to uniformly coat the positive and negative current collectors with a slurry possessing good stability, suitable viscosity, and excellent flowability.

[0003] Electrode coating is crucial for lithium-ion batteries. Generally, in pilot production lines in laboratories and research centers, the slurry is transferred to the current collector before coating by scooping it with a spoon or pouring it directly. However, this method makes it difficult to precisely control the amount of slurry used, leading to significant waste. Especially on coating machines equipped with heating functions, the relatively slow transfer speed causes the slurry initially poured onto the current collector to be heated for too long, easily forming viscous particles. These particles leave visible scratches after being scraped by the scraper, and even during subsequent drying, these scratches are difficult to eliminate through leveling. Furthermore, the presence of large, undispersed particles in the slurry results in uneven slurry distribution when coated onto the current collector, affecting coating quality. Utility Model Content

[0004] The purpose of this invention is to provide a coating transfer device that can accurately and quickly control the volume of the slurry transferred onto the collector, and can filter out large particles in the slurry that are not completely dispersed during the transfer process.

[0005] The following technical solutions are used to achieve the above objectives.

[0006] This utility model provides a coating transfer device, which includes a piston cylinder, a piston, a needle, and a filter assembly.

[0007] The piston is movably disposed within the piston cylinder;

[0008] The filter assembly includes a connecting seat, a pull-out component, and a filter screen; the connecting seat has a communicating channel along a first direction; the piston cylinder is connected to the needle through the connecting seat, and the piston cylinder, the communicating channel, and the needle are sequentially connected; the connecting seat has a sliding groove communicating with the communicating channel along a second direction, and the first direction and the second direction intersect; the filter screen is disposed on the pull-out component, the pull-out component is slidably and sealed in the sliding groove, and the filter screen has a first position and a second position. When the filter screen is in the first position, the filter screen is located at the communicating channel; when the filter screen is in the second position, the filter screen is offset from the communicating channel.

[0009] In some embodiments, the connector includes a first housing, a second housing, a first sealing ring, and a second sealing ring;

[0010] The first housing has a non-closed annular protrusion, the inner side of which forms the sliding groove, and the outer periphery of which has a first groove. The first sealing ring is disposed in the first groove. The second housing has a second groove corresponding to the position of the first groove, and the second sealing ring is disposed in the second groove. The first housing and the second housing are detachably connected. When the first housing and the second housing are in the connected state, the first sealing ring and the second sealing ring contact to form a sealing space.

[0011] In some embodiments, the first housing is provided with a plurality of dispersed first connection holes around its perimeter, and the second housing is provided with a plurality of dispersed second connection holes around its perimeter. The first housing is detachably connected to the second housing by fasteners passing through the first connection holes and the second connection holes in sequence.

[0012] In some embodiments, the pull-out member has a connecting hole, and the pull-out member has a slot corresponding to the edge position of the connecting hole; the filter screen includes a connecting sleeve and a filter screen body disposed on the connecting sleeve; the connecting sleeve is engaged with the slot.

[0013] In some embodiments, the connecting sleeve has three blades evenly distributed along its circumferential direction; the slot has three flanges spaced apart, and a retaining edge is formed between the flanges and the side wall and bottom wall of the slot, and the blades of the connecting sleeve can be screwed into the retaining edge.

[0014] In some embodiments, the width of the blade increases sequentially from the first end to the second end along the circumferential direction of the connecting sleeve, and the shape of the retaining edge is adapted to the shape of the blade.

[0015] In some embodiments, a guide groove is formed between the inner end of the pull-out member and the connecting hole. The guide groove and the slot are disposed on opposite sides of the pull-out member, and the guide groove is disposed on the side closer to the piston cylinder. The direction in which the guide groove extends from the connecting hole to the inner end of the pull-out member has a triangular structure.

[0016] In some embodiments, the two opposite ends of the connector are respectively provided with a first connecting pipe and a second connecting pipe communicating with the communication channel; the piston cylinder is detachably connected to the first connecting pipe, and the needle is detachably connected to the second connecting pipe.

[0017] In some embodiments, the piston includes a handle, a piston shaft, a piston body, and a third sealing ring; the handle is connected to the piston body via the piston shaft, the piston body has a sealing groove, the third sealing ring is disposed on the sealing groove, and the piston body is slidably sealed within the piston cylinder by the third sealing ring.

[0018] In some embodiments, the piston further includes a reference rod connected to the handle; the reference rod is arranged parallel to the piston shaft and located outside the piston cylinder; the outside of the piston cylinder is provided with a scale corresponding to the position of the reference rod.

[0019] The technical solution provided by this utility model has the following advantages and effects:

[0020] This coating transfer device, through the coordinated action of a piston cylinder, piston, filter assembly, and needle, can control the movement of the piston to adsorb and release slurry, thereby quickly and uniformly transferring the slurry to the collector. It can also precisely control the volume of slurry transferred to the collector, effectively avoiding slurry waste and ensuring coating quality. A connecting seat is provided between the piston cylinder and the needle to form a communication channel, and a retractable filter screen is installed in the connecting seat. This allows the slurry to pass through the filter screen only when being pushed by positive pressure during the transfer operation, filtering out large particles and improving transfer efficiency and coating quality. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the coating transfer device according to an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A schematic diagram of the longitudinal cross-sectional structure of a coating transfer device;

[0023] Figure 3 yes Figure 1 A schematic diagram of the exploded structure of a coating transfer device;

[0024] Figure 4 This is a schematic diagram of the structure of the first housing according to an embodiment of the present utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the second housing according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the connecting sleeve according to an embodiment of the present utility model;

[0027] Figure 7 This is a structural schematic diagram of the pull-out component at one angle according to an embodiment of the present utility model;

[0028] Figure 8 This is a structural schematic diagram of the pull-out component from another angle according to an embodiment of this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Piston cylinder; 11. Scale; 2. Piston; 21. Handle; 22. Piston shaft; 23. Piston body; 231. Sealing groove; 24. Third sealing ring; 25. Reference rod; 3. Needle; 4. Filter assembly; 41. Connecting seat; 411. Communicating channel; 412. First housing; 4121. Annular protrusion; 4122. First connecting hole; 413. Second housing; 4131. Second groove; 4132. Second connecting hole; 414. First sealing ring; 415. Second sealing ring; 416. First connecting tube; 417. Second connecting tube; 418. Sliding groove; 42. Pull-out piece; 421. Communicating hole; 422. Slot; 423. Flange; 424. Guide groove; 43. Filter screen; 431. Connecting sleeve; 432. Filter screen body; 433. Rotary blade. Detailed Implementation

[0031] To facilitate understanding of this utility model, the specific embodiments of this utility model will be described in more detail below with reference to the accompanying drawings.

[0032] Unless otherwise specified or defined, the terms "first," "second," etc., used in this document are for distinguishing names only and do not represent a specific number or order.

[0033] Unless otherwise stated or defined, the term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0034] It should be noted that in this article, "fixed to" or "connected to" can mean directly fixed to or connected to a component, or indirectly fixed to or connected to a component.

[0035] It should be noted that this slurry transfer device for coating is mainly used in pilot production lines in laboratories and research centers. It is used to transfer the slurry onto the current collector, facilitating subsequent coating operations to form battery-grade wafers for research or testing. The specific structure of this slurry transfer device is described below.

[0036] This utility model embodiment provides a coating slurry transfer device, such as... Figures 1 to 8 As shown, the coating transfer device includes a piston cylinder 1, a piston 2, a needle 3, and a filter assembly 4.

[0037] The piston 2 is movably disposed within the piston cylinder 1. The filter assembly 4 includes a connecting seat 41, a pull-out member 42, and a filter screen 43; the connecting seat 41 has a communicating channel 411 along a first direction; the piston cylinder 1 is connected to the needle 3 through the connecting seat 41, and the piston cylinder 1, the communicating channel 411, and the needle 3 are sequentially connected; the connecting seat 41 has a sliding groove 418 along a second direction communicating with the communicating channel 411, and the first direction and the second direction intersect. The filter screen 43 is disposed on the pull-out member 42, and the pull-out member 42 is slidably and sealed within the sliding groove 418. The filter screen 43 has a first position and a second position. When the filter screen 43 is in the first position, it is located at the communicating channel 411; when the filter screen 43 is in the second position, it is offset from the communicating channel 411. Specifically, the first direction is the axial direction of the piston cylinder 1, and the second direction is the direction perpendicular to the first direction. That is, the connecting seat 41 has the connecting channel 411 along its longitudinal direction and the sliding groove 418 along its transverse direction, so that the pull-out member 42 can be pushed and pulled from one side of the connecting seat 41, allowing the pull-out member 42 to move in the transverse direction. It should be noted that by pulling the piston 2 inside the piston cylinder 1 with external force, a negative pressure is formed to adsorb the slurry into the piston cylinder 1 for temporary storage, or a positive pressure is used to push the slurry temporarily stored in the piston cylinder 1 to be transferred to the current collector through the connecting channel 411 and the needle 3 to prepare the battery-grade sheet. Through the cooperation of the piston cylinder 1 and the piston 2, the volume of slurry transferred to the current collector can be precisely controlled. Specifically, when using the coating transfer device, the filter screen 43 is first moved to the second position by the pull-out member 42. At this time, the filter screen 43 is offset from the connecting channel 411. External force pulls the piston 2 to move in the piston cylinder 1 to form a negative pressure, and the prepared slurry is sequentially passed through the needle 3 and the connecting channel 411 into the piston cylinder 1. Since the filter screen 43 is offset from the connecting channel 411, the slurry does not pass through the filter screen 43. The connecting channel 411 is unobstructed, so the slurry can be quickly sucked into the piston cylinder 1 for temporary storage. When the transfer operation is required, the filter screen 43 is moved to the first position by the pull-out member 42. At this time, the filter screen 43 is located at the connecting channel 411. When the positive pressure pushes the slurry temporarily stored in the piston cylinder 1 to the connecting channel 411, the slurry can be filtered through the filter screen 43, and large particles in the slurry are intercepted. The filtered slurry is then transferred to the collector through the needle 3.

[0038] In summary, this coating transfer device, through the coordinated action of piston cylinder 1, piston 2, filter assembly 4, and needle 3, can control the movement of piston 2 to adsorb and release slurry, thereby quickly releasing slurry onto the collector and precisely controlling the volume of slurry released onto the collector. This effectively avoids slurry waste and prevents impact on coating quality. Furthermore, a connecting seat 41 is provided between piston cylinder 1 and needle 3 to form a connecting channel 411, and a retractable filter screen 43 is installed on the connecting seat 41. Thus, the slurry does not pass through the filter screen 43 when it is drawn into piston cylinder 1, but only when the slurry is pushed under positive pressure for transfer. This filters the slurry to trap large particles, thereby improving coating quality and transfer efficiency.

[0039] In some embodiments, such as Figures 3 to 5 As shown, the connecting seat 41 includes a first housing 412, a second housing 413, a first sealing ring 414, and a second sealing ring 415. The first housing 412 has a non-closed annular protrusion 4121. Specifically, the annular protrusion 4121 has a notch at a position near its left side, which facilitates the extension of the pull-out member 42 to the outside of the connecting seat 41. The sliding groove 418 is formed on the inner side of the annular protrusion 4121, and a first groove is provided on the outer periphery of the annular protrusion 4121. The first sealing ring 414 is disposed in the first groove. The second housing 413 has a second groove 4131 at a position corresponding to the first groove, and the second sealing ring 415 is disposed in the second groove 4131. The first housing 412 and the second housing 413 are detachably connected. When the first housing 412 and the second housing 413 are in the connected state, the first sealing ring 414 and the second sealing ring 415 contact to form a sealing space. The first housing 412 and the second housing 413 are detachably connected, specifically by snap-fit, pin-fit, or bolt-fit, etc., without particular limitation. This allows for quick assembly and disassembly of the connecting seat 41, facilitating the removal and cleaning of the components within the connecting seat 41 after slurry transfer, and enabling subsequent reuse. A sliding groove 418 is formed between the first housing 412 and the second housing 413, and a sealing ring is formed on the outside of the sliding groove 418. When the two housings are assembled, they can make close contact to form a sliding space for accommodating the pull-out component 42, effectively preventing slurry from leaking out of gaps. The surface of the pull-out component 42 is polished to create a smooth surface, ensuring a tight, sealed contact with the first housing 412 and the second housing 413.

[0040] In some embodiments, such as Figure 3As shown, the first housing 412 has multiple dispersed first connection holes 4122 around its perimeter, and the second housing 413 has multiple dispersed second connection holes 4132 around its perimeter. The first housing 412 is detachably connected to the second housing 413 by fasteners that pass through the first connection holes 4122 and the second connection holes 4132 in sequence. The fasteners can be bolts, and both the first connection holes 4122 and the second connection holes 4132 are threaded holes. The bolts sequentially thread the first connection holes 4122 and the second connection holes 4132 to ensure a secure connection between the first housing 412 and the second housing 413, and to facilitate easy disassembly.

[0041] In some embodiments, such as Figure 3 , Figure 6 and Figure 8 As shown, the pull-out component 42 has a connecting hole 421, and the pull-out component 42 has a slot 422 corresponding to the edge position of the connecting hole 421; the filter screen 43 includes a connecting sleeve 431 and a filter screen body 432 disposed on the connecting sleeve 431; the connecting sleeve 431 is engaged in the slot 422. Specifically, the connecting sleeve 431 is a hollow annular sleeve, wherein a step is formed on the connecting sleeve 431, the filter screen body 432 is placed on the step of the connecting sleeve 431, and then the connecting sleeve 431 is engaged in the slot 422 of the pull-out component 42, thereby firmly assembling the filter screen body 432 in the position facing the connecting hole 421 onto the pull-out component 42, and making it easy to disassemble for cleaning.

[0042] In some embodiments, such as Figure 6 and Figure 8 As shown, the connecting sleeve 431 has three evenly distributed blades 433 along its circumferential direction; the slot 422 has three flanges 423 spaced apart, and the flanges 423 form a retaining edge with the side wall and bottom wall of the slot 422, allowing the blades 433 of the connecting sleeve 431 to screw into the retaining edge. The slot 422 is located between two adjacent flanges 423 to form an initial placement position. When it is necessary to fix the connecting sleeve 431 to the pull-out component 42, the three blades 433 of the connecting sleeve 431 are first placed in this position, and then external force is applied to the connecting sleeve 431 to rotate it, causing the three blades 433 of the connecting sleeve 431 to screw into the retaining edge of the pull-out component 42 for fixation. When disassembly is required, the connecting sleeve 431 is rotated in the opposite direction to allow the three blades 433 to unscrew from the retaining edge of the pull-out component 42, making disassembly simple and convenient. It should be noted that the surface of the connecting sleeve 431 can be formed with a slot, and the connecting sleeve 431 can be screwed into or out of the retaining edge by applying a screwdriver to the slot.

[0043] In some embodiments, the width of the blade 433 increases sequentially from the first end to the second end along the circumferential direction of the connecting sleeve 431, and the shape of the retaining edge is adapted to the shape of the blade 433. The circumferential direction of the connecting sleeve 431 is also the screw-in direction of the blade 433. By sequentially increasing the blade width of the blade 433 along the screw-in direction, a dynamic fitting process with a wide inlet and a tight fit at the end is formed, which can greatly simplify the assembly operation, reduce the assembly accuracy requirements, and automatically lock in place without the need for an additional locking device.

[0044] In some embodiments, such as Figure 7 As shown, a guide groove 424 is formed between the inner end of the pull-out member 42 and the connecting hole 421. The guide groove 424 and the slot 422 are disposed on opposite sides of the pull-out member 42, and the guide groove 424 is disposed on the side closer to the piston cylinder 1. The guide groove 424 extends from the connecting hole 421 to the inner end of the pull-out member 42 in a triangular structure. Specifically, the guide groove 424 forms a triangular groove, that is, the groove width near the inner end of the pull-out member 42 is greater than the groove width near the connecting hole 421. Of course, in other embodiments, the guide groove 424 can also be other suitable shapes, and no special restrictions are made here. It should be noted that the inner end of the pull-out member 42 refers to the end of the pull-out member 42 located within the sliding groove 418, and the outer end of the pull-out member 42 refers to the end of the pull-out member 42 away from the inner end. The outer end of the pull-out member 42 is externally placed on the connecting seat 41. By applying external force to the outer end of the pull-out member 42, the pull-out member 42 can be pushed and pulled, thereby allowing the pull-out member 42 to slide back and forth along the sliding groove 418. The width of the outer end of the pull-out member 42 is greater than the width of the opening of the sliding groove 418, and the width of the inner end of the pull-out member 42 is also greater than the width of the opening of the sliding groove 418, so that the pull-out member 42 will not completely detach from or slide into the sliding groove 418. Understandably, since the pull-out member 42 and the connecting seat 41 are in sealed contact, when the pull-out member 42 is pulled outward to make the filter screen 43 offset from the connecting channel 411 and the piston cylinder 1 sucks in the slurry, there will be slurry in the sliding groove 418 area between the pull-out member 42 and the connecting channel 411. When the pull-out member 42 is pushed into place, there will be residual slurry between the end of the pull-out member 42 and the inner end of the connecting seat 41 corresponding to the sliding groove 418, which is difficult to flow back, making it difficult for the pull-out member 42 to be pushed into place smoothly. Therefore, by forming a guide groove 424 between the inner end of the pull-out member 42 and the connecting hole 421, the remaining slurry can flow smoothly back into the piston cylinder 1 along the guide groove 424 to ensure that the pull-out member 42 can be pushed in smoothly.

[0045] In some embodiments, such as Figure 3As shown, the connecting seat 41 has a first connecting pipe 416 and a second connecting pipe 417 respectively at its opposite ends, which communicate with the communicating channel 411; the piston cylinder 1 is detachably connected to the first connecting pipe 416, and the needle 3 is detachably connected to the second connecting pipe 417. Specifically, the first connecting pipe 416 of the connecting seat 41 may have an internal thread, and the discharge end of the piston cylinder 1 may have an external thread. Alternatively, the first connecting pipe 416 of the connecting seat 41 may have an external thread, and the discharge end of the piston cylinder 1 may have an internal thread. The first connecting pipe 416 of the connecting seat 41 is threadedly connected to the piston cylinder 1, thereby forming a detachable connection structure. This structure features a stable connection and easy disassembly, allowing the piston cylinder 1 and the connecting seat 41 to be disassembled for cleaning after the slurry transfer is completed. Furthermore, the second connecting tube 417 of the connecting seat 41 may have an internal thread, and the needle 3 may have an external thread. Alternatively, the second connecting tube 417 of the connecting seat 41 may have an external thread, and the needle 3 may have an internal thread. The second connecting tube 417 of the connecting seat 41 is threadedly connected to the needle 3, thereby forming a detachable connection structure. This structure features a stable connection and easy disassembly, allowing the needle 3 and the connecting seat 41 to be removed for cleaning after the slurry transfer is completed. It should be noted that in other embodiments, the connection between the first connecting tube 416 and the piston cylinder 1, and between the second connecting tube 417 and the needle 3, is not limited to a threaded connection. Other detachable connection methods, such as clamp connections and flange connections, are also acceptable and are not particularly limited here.

[0046] In some embodiments, such as Figures 1 to 3 As shown, the piston 2 includes a handle 21, a piston shaft 22, a piston body 23, and a third sealing ring 24; the handle 21 is connected to the piston body 23 through the piston shaft 22, the piston body 23 has a sealing groove 231, the third sealing ring 24 is disposed on the sealing groove 231, and the piston body 23 is slidably sealed in the piston cylinder 1 by the third sealing ring 24. Specifically, the piston body 23 is cylindrical, and an open threaded hole is provided at the middle of one end of the piston body 23. The edge of the end of the piston body 23 with the threaded hole also has a stepped sealing groove 231. A retaining plate is provided at the end of the piston shaft 22 away from the handle 21. This retaining plate is cylindrical and adapted to the shape of the piston body 23. The end of the piston shaft 22 extends out of the retaining plate and has external threads. A third sealing ring 24 is fitted into the sealing groove 231 of the piston body 23 to form an interference fit. Then, the piston body 23 and the piston shaft 22 are threadedly tightened. The third sealing ring 24 is positioned between the piston body 23 and the retaining plate, allowing the piston body 23 to slide in a sealed manner relative to the piston cylinder 1. The piston body 23 can be partially disassembled for cleaning. Specifically, the piston cylinder 1 and piston shaft 22 can be made of stainless steel, the piston body 23 can be made of Teflon, and the third sealing ring 24 can be made of fluororubber, etc.

[0047] In some embodiments, such as Figure 1 As shown, the piston 2 also includes a reference rod 25 connected to the handle 21; the reference rod 25 is arranged parallel to the piston shaft 22 and located on the outside of the piston cylinder 1; a scale 11 is provided on the outside of the piston cylinder 1 corresponding to the position of the reference rod 25. When an external force is applied to the handle 21 to push or pull the piston shaft 22, the reference rod 25 can be pulled to move along the scale 11, thereby allowing for direct observation of the slurry intake and usage, realizing real-time reading and highly precise control of the slurry usage, effectively avoiding waste or insufficient dosage.

[0048] The above embodiments are not an exhaustive list based on the present invention, and there may be other embodiments not listed. Any substitutions and improvements made without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A transfer device for coating, characterized in that The coating transfer device includes a piston cylinder, a piston, a needle, and a filter assembly; The piston is movably disposed within the piston cylinder; The filter assembly includes a connecting seat, a pull-out component, and a filter screen; the connecting seat has a communicating channel along a first direction; the piston cylinder is connected to the needle through the connecting seat, and the piston cylinder, the communicating channel, and the needle are sequentially connected; the connecting seat has a sliding groove communicating with the communicating channel along a second direction, and the first direction and the second direction intersect; the filter screen is disposed on the pull-out component, the pull-out component is slidably and sealed in the sliding groove, and the filter screen has a first position and a second position. When the filter screen is in the first position, the filter screen is located at the communicating channel; when the filter screen is in the second position, the filter screen is offset from the communicating channel.

2. The coating transfer device as described in claim 1, characterized in that, The connecting seat includes a first housing, a second housing, a first sealing ring, and a second sealing ring; The first housing has a non-closed annular protrusion, the inner side of which forms the sliding groove, and the outer periphery of which has a first groove. The first sealing ring is disposed in the first groove. The second housing has a second groove corresponding to the position of the first groove, and the second sealing ring is disposed in the second groove. The first housing and the second housing are detachably connected. When the first housing and the second housing are in the connected state, the first sealing ring and the second sealing ring contact to form a sealing space.

3. The coating transfer device as described in claim 2, characterized in that, The first housing has multiple dispersed first connection holes around its perimeter, and the second housing has multiple dispersed second connection holes around its perimeter. The first housing is detachably connected to the second housing by fasteners passing through the first connection holes and the second connection holes in sequence.

4. The coating transfer device as described in claim 2, characterized in that, The pull-out component has a connecting hole, and the pull-out component has a slot corresponding to the edge position of the connecting hole; the filter screen includes a connecting sleeve and a filter screen body disposed on the connecting sleeve; the connecting sleeve is engaged with the slot.

5. The coating transfer device as described in claim 4, characterized in that, The connecting sleeve has three blades evenly distributed along its circumferential direction; the slot has three flanges spaced apart, and the flanges form a retaining edge between the side wall and bottom wall of the slot, and the blades of the connecting sleeve can be screwed into the retaining edge.

6. The coating transfer apparatus as described in claim 5, characterized in that, The width of the blade increases sequentially from the first end to the second end along the circumferential direction of the connecting sleeve, and the shape of the retaining edge is adapted to the shape of the blade.

7. The coating transfer apparatus as described in claim 4, characterized in that, A flow guide groove is formed between the inner end of the pull-out component and the connecting hole. The flow guide groove and the slot are located on opposite sides of the pull-out component, and the flow guide groove is located on the side closer to the piston cylinder. The flow guide groove extends from the connecting hole to the inner end of the pull-out component in a triangular shape.

8. The coating transfer apparatus according to any one of claims 1-7, characterized in that, The two ends of the connector are respectively provided with a first connecting pipe and a second connecting pipe that communicate with the communication channel; the piston cylinder is detachably connected to the first connecting pipe, and the needle is detachably connected to the second connecting pipe.

9. The coating transfer apparatus according to any one of claims 1-7, characterized in that, The piston includes a handle, a piston shaft, a piston body, and a third sealing ring; the handle is connected to the piston body through the piston shaft, the piston body has a sealing groove, the third sealing ring is disposed on the sealing groove, and the piston body is slidably disposed in the piston cylinder through the third sealing ring.

10. The coating transfer apparatus as described in claim 9, characterized in that, The piston also includes a reference rod connected to the handle; the reference rod is arranged parallel to the piston shaft and located outside the piston cylinder; the outside of the piston cylinder is provided with a scale corresponding to the position of the reference rod.

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