Painting process of high heat grade electromagnetic wire and painting mold thereof

Abstract

This invention discloses a coating process and coating mold for high-heat-grade electromagnetic wire. The process includes feeding the electromagnetic wire into a first coating mold, coating it with a first insulating varnish, and then passing it through a core hole with a stepped decreasing aperture to achieve the desired varnish film thickness, resulting in product A. Product A is then dried and shaped in an oven, and then fed into a second coating mold where a first heat-resistant varnish forms a reverse spiral on its surface, resulting in product B. Product B is then dried and shaped in an oven, and then fed into a third coating mold where a second heat-resistant varnish forms a forward spiral on its surface, resulting in product C. Product C is then dried and shaped in an oven, and then fed into a fourth coating mold where it is coated with a second insulating varnish, and then passed through a core hole with a stepped decreasing aperture to achieve the desired second insulating varnish film thickness, resulting in the finished product. This invention features improved coating quality and convenient mold replacement.

Description

Technical Field

[0001] This invention relates to the processing and preparation of electromagnetic wires, and in particular to a coating process for high-heat-grade electromagnetic wires and its coating mold. Background Technology

[0002] To improve the uniformity of coating on magnet wires, coating rollers and coating dies are commonly used. In this process, the coating roller first applies the coating to the conductor surface, then the coated magnet wire passes through the coating die, which removes excess coating, thus controlling the coating thickness. However, the tension control of the magnet wire is not stable enough. Excessive tension can lead to coating cracking and breakage, while insufficient tension can cause jumping and contact problems during wire routing. The coating roller's application of the coating is also uneven, resulting in inconsistent coating thickness control along the wire's length. Furthermore, the coating die's single-stage coating process is not precise enough, leading to quality issues such as pinholes, rough edges, varnish nodules, and uneven thickness. Additionally, the coating die's thickness control is fixed; different dies are required for different coating thicknesses, making production cumbersome and inconvenient. Therefore, current methods for painting electromagnetic wires have problems such as the need to improve coating quality and the inconvenience of changing the painting mold when the specifications of the electromagnetic wire change. Summary of the Invention

[0003] The purpose of this invention is to provide a coating process and coating mold for high-thermal-grade electromagnetic wires. This invention features improved coating quality and convenient mold replacement.

[0004] The technical solution of this invention: a coating process for high-thermal-grade electromagnetic wire, comprising the following steps:

[0005] S1. The electromagnetic wire is fed into the first coating mold. After being wrapped with a certain thickness of first insulating varnish, it passes through the core hole of the mold core with a stepped decrease in diameter. The varnish layer is scraped off repeatedly to achieve the required thickness of the first insulating varnish film, thus obtaining product A.

[0006] S2. Place product A into an oven to dry and set its shape, then place it into the second painting mold. Rotate the second painting mold and spray the first heat-resistant paint around product A, forming a reverse spiral of the first heat-resistant paint on the surface of product A, to obtain product B.

[0007] S3. Place product B into an oven to dry and set its shape, then place it into the third painting mold. Rotate the third painting mold in the opposite direction to the rotation of the second painting mold. During this process, spray the second heat-resistant paint around product B, forming a positive spiral of the second heat-resistant paint on the surface of product B, thus obtaining product C.

[0008] S4. The C product is placed in an oven to dry and set, and then placed into the fourth coating mold. After being coated with a certain thickness of second insulating varnish, it is then passed through the core holes of the mold core with stepped decreasing apertures. The varnish layer is scraped off multiple times to achieve the required thickness of the second insulating varnish film, thus obtaining the finished product.

[0009] In the aforementioned high-heat-grade electromagnetic wire coating process, before step S1, the electromagnetic wire undergoes tension control and monitoring. The electromagnetic wire is passed around a tension wheel, which is pulled by a tension spring. Once the tension of the electromagnetic wire changes, the tension spring deforms, triggering a micro switch and immediately issuing an alarm.

[0010] In the aforementioned high-heat-grade electromagnetic wire coating process, in steps S1 and S4, after the electromagnetic wire passes through multiple core holes of the mold, it enters the adjustment sleeve. The positions of multiple adjusted scrapers limit the diameter of the scraping openings formed by the multiple scrapers to meet the coating requirements. The multiple scrapers are rotated to evenly remove excess paint from the electromagnetic wire, thereby improving the accuracy of paint layer thickness control and the quality of the electromagnetic wire.

[0011] In the aforementioned high-heat-grade electromagnetic wire coating process, before the scraper coating, an oil felt is used to touch up the coating on the electromagnetic wire. This replenishes the coating liquid to pinholes and uneven areas on the electromagnetic wire, improving the uniformity and quality of the coating layer.

[0012] A high-heat-grade electromagnetic wire coating mold, applied to the aforementioned high-heat-grade electromagnetic wire coating process, includes a first coating mold, a second coating mold, a third coating mold, and a fourth coating mold sequentially disposed at the inlet and outlet positions of an oven. The first and fourth coating molds each include several interconnected mold sleeves, each containing a core. The diameter of the core hole in different mold sleeves decreases sequentially according to the electromagnetic wire conveying direction. The first mold sleeve contains a first spray head. The second and third coating molds rotate in opposite directions during operation. Both the second and third coating molds contain a liquid storage chamber and a through-hole for coating. The liquid storage chamber contains liquid coating, and a second spray head is located at the coating hole. The second spray head is connected to the liquid storage chamber via a pump.

[0013] In the aforementioned high-heat-grade electromagnetic wire coating mold, the ends of the first coating mold and the fourth coating mold are both spliced ​​with adjustment sleeves. The adjustment sleeve includes a fixed section and a rotating section. The rotating section is in a rotating state during operation. A conical hole is provided in the rotating section. Several scrapers are provided along the circumferential direction on the inner wall of the conical hole. The scrapers are axially slidably connected to the conical hole. On the side of the scraper facing the electromagnetic wire, an oil felt and a felt are sequentially provided along the electromagnetic wire conveying direction. Paint is attached to the oil felt.

[0014] In the aforementioned high-heat-grade electromagnetic wire coating mold, the inner wall of the conical hole is provided with several axially distributed magnetic tracks along the circumferential direction, and the scraper is slidably connected to and attracted to the magnetic tracks.

[0015] In the aforementioned high-thermal-grade electromagnetic wire coating mold, the first coating mold and the third coating mold are located on the same side, and the second coating mold and the fourth coating mold are located on the same side. A first driven pulley is fitted around the rotating section of both the first and fourth coating molds, and a second driven pulley is fitted around both the second and third coating molds. The first driven pulley of the first coating mold and the second driven pulley of the third coating mold are connected by a synchronous belt. The first driven pulley of the first coating mold is connected to the driving pulley of the first drive motor via the synchronous belt. The second driven pulley of the second coating mold and the first driven pulley of the fourth coating mold are connected by a synchronous belt. The second driven pulley of the second coating mold is connected to the driving pulley of the second drive motor via the synchronous belt. The rotation direction of the first drive motor is opposite to that of the second drive motor.

[0016] In the aforementioned high-heat-grade electromagnetic wire coating mold, a tension bracket is also provided on the front side of the inlet of the first coating mold. A sliding groove is provided on the tension bracket, and a tension wheel is movably connected in the sliding groove. The tension wheel is pulled by a tension spring. A micro switch is provided on one side of the tension spring. The contact of the micro switch extends into the gap of the tension spring but does not contact the tension spring. The micro switch is connected to an alarm via a controller.

[0017] In the aforementioned high-heat-grade electromagnetic wire coating mold, the mold sleeves are connected by a tenon and mortise structure or by a connecting flange.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] In this invention, the electromagnetic wire is first coated and touched up with a first insulating varnish to reduce pinholes and pitting. Then, by removing excess varnish in a progressively decreasing manner, the thickness of the varnish layer can be better controlled, improving the coating quality of the electromagnetic wire. The mold sleeves are spliced ​​together and can be reduced, added, or replaced according to actual needs to meet the requirements of different varnish film thicknesses. It is flexible in use, easy to assemble and disassemble, and has wide versatility.

[0020] The coating is applied to the surface of the electromagnetic wire by spraying with a second and a third coating mold that rotate in opposite directions. In conjunction with the feeding of the electromagnetic wire, a first and a second heat-resistant coating layer with an alternating wave pattern are formed on the surface of the electromagnetic wire. This not only increases the torsional resistance of the wire and improves its anti-torsion performance, but also improves the heat resistance of the electromagnetic wire by the superimposed first and second heat-resistant coating layers. Furthermore, it increases the contact area between the first insulating coating layer, the first heat-resistant coating layer, the second heat-resistant coating layer, and the second insulating coating layer, thereby improving the adhesion between the coating layers. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the first painting mold;

[0023] Figure 3 This is a schematic diagram of the structure of the second painting mold;

[0024] Figure 4 This is a schematic diagram of the adjusting sleeve.

[0025] The labels in the attached diagram are as follows: 1. First painting mold; 11. Mold sleeve; 12. Mold core; 13. First spray head; 14. First driven pulley; 15. Synchronous belt; 16. First drive motor; 2. Second painting mold; 21. Liquid storage chamber; 22. Painting hole; 23. Second spray head; 24. Second driven pulley; 25. Second drive motor; 3. Third painting mold; 4. Fourth painting mold; 5. Oven; 51. Positioning wheel; 52. Guide wheel; 6. Adjusting sleeve; 61. Fixed section; 62. Rotating section; 63. Conical hole; 64. Scraper; 65. Oil felt; 66. Felt; 67. Magnetic track; 7. Tension bracket; 71. Tension wheel; 72. Tension spring; 73. Micro switch; 8. Electromagnetic wire. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0027] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] Example:

[0029] The coating process for high-heat-grade electromagnetic wire includes the following steps:

[0030] S1. The electromagnetic wire 8 is passed around the tension wheel 71. The tension wheel 71 is pulled by the tension spring 72. Once the tension of the electromagnetic wire 8 changes, the tension spring 72 deforms and triggers the micro switch 73, which immediately sounds an alarm to ensure a stable tension of the electromagnetic wire 8 during the painting process.

[0031] S2. The electromagnetic wire 8 is fed into the first coating mold 1. After being wrapped with a certain thickness of first insulating varnish, it passes through the core hole of the mold core with a stepped decreasing aperture in sequence. The varnish layer is scraped off repeatedly to achieve the required varnish film thickness of the first insulating varnish, thus obtaining product A.

[0032] S3. Place product A into oven 5 to dry and set its shape, then place it into the second painting mold 2. Rotate the second painting mold 2. During this process, spray the first heat-resistant paint around product A, forming a reverse spiral of the first heat-resistant paint on the surface of product A, to obtain product B.

[0033] S4. Place product B into oven 5 to dry and set its shape, and then place it into the third painting mold 3. Rotate the third painting mold 3 in the opposite direction to the rotation of the second painting mold 2. During this process, spray the second heat-resistant paint around product B as the center, forming a positive spiral of the second heat-resistant paint on the surface of product B, thus obtaining product C.

[0034] S5. The C product is sent to the drying oven 5 for drying and shaping, and then sent to the fourth coating mold 4. After being coated with a certain thickness of second insulating varnish, it is then passed through the core hole of the mold core with a stepped decreasing aperture. The varnish layer is scraped off multiple times to achieve the required varnish film thickness of the second insulating varnish, and the finished product is obtained.

[0035] In steps S2 and S5, the electromagnetic wire is first coated and touched up with the first insulating varnish to reduce pinholes and pitting. Then, by removing excess varnish in a progressively decreasing manner, the thickness of the varnish layer can be better controlled, thus improving the coating quality of the electromagnetic wire 8.

[0036] In steps S3 and S4, the second and third coating molds 2 and 3, which rotate in opposite directions, are sprayed onto the surface of the electromagnetic wire. In conjunction with the feeding of the electromagnetic wire, a first and second heat-resistant paint layer with alternating waves is formed on the surface of the electromagnetic wire 8. This not only increases the torsional resistance of the wire and improves its anti-torsion performance, but also improves the heat resistance level of the electromagnetic wire 8 by the superimposed first and second heat-resistant paint layers. Furthermore, it increases the contact area between the first insulating paint layer, the first heat-resistant paint layer, the second heat-resistant paint layer, and the second insulating paint layer, thereby improving the adhesion between the paint layers.

[0037] In steps S2 and S5, after the electromagnetic wire 8 undergoes scraping treatment through multiple core holes, it enters the adjusting sleeve 6. The positions of the adjusted scraper blades 64 are defined to ensure the diameter of the scraping openings formed by the scraper blades 64 meets the painting requirements. The scraper blades 64 are rotated, and the oil felt 65 is used to touch up the paint on the electromagnetic wire 8, replenishing paint to pinholes and uneven areas, improving the uniformity and quality of the paint layer. Then, excess paint is evenly removed from the electromagnetic wire 8, thereby improving the accuracy of paint layer thickness control and the quality of the electromagnetic wire 8. The scraper blades can be adjusted within the adjusting sleeve to change the diameter of the scraping openings formed by the scraper blades, ensuring they meet the painting requirements.

[0038] like Figure 1-4 As shown, a high-heat-grade electromagnetic wire coating mold is used in the coating process of the aforementioned high-heat-grade electromagnetic wire. It includes a first coating mold 1, a second coating mold 2, a third coating mold 3, and a fourth coating mold 4, which are respectively set at the inlet and outlet positions of the oven 5. The first coating mold 1 and the fourth coating mold 4 each include several interconnected mold sleeves 11. A mold core 12 is provided inside the mold sleeve 11. The diameter of the core hole in the mold core in different mold sleeves 11 decreases sequentially according to the conveying direction of the electromagnetic wire 8. A first spray head 13 is provided inside the first mold sleeve 11. The second coating mold 2 and the third coating mold 3 are in a rotating state when working and rotate in opposite directions. Both the second coating mold 2 and the third coating mold 3 are provided with a liquid storage chamber 21 and a through coating hole 22. The liquid storage chamber 21 is filled with paint liquid. A second spray head 23 is provided at the coating hole 22. The second spray head 23 is connected to the liquid storage chamber 21 via a liquid pump.

[0039] A positioning wheel 51 is set on the front side of the first painting mold 1 to position the electromagnetic wire 8, ensuring that the electromagnetic wire 8 enters at a suitable position, centered in the first painting mold 1. The first spray head 13 of the first painting mold 1 and the fourth painting mold 4 fills the annular groove of the first mold sleeve 11 with paint liquid. The electromagnetic wire 8 passes through the annular groove filled with paint liquid, and the paint liquid fully wets and wraps the introduced electromagnetic wire 8, thereby coating the surface of the electromagnetic wire 8 with a certain thickness and uniform paint layer, realizing the painting and touch-up functions of the electromagnetic wire 8. Then, the electromagnetic wire 8 passes through the core hole of the mold core with gradually decreasing aperture, and the excess paint liquid is scraped off layer by layer, thereby ensuring that the electromagnetic wire 8 meets the paint layer thickness. This method is less likely to have problems such as paint nodules and pinholes, and can better control the paint layer thickness with high control precision, ensuring the consistency of the electromagnetic wire appearance. In addition, the mold sleeves 11 are spliced ​​together, and can be reduced, added or replaced according to actual needs to meet the requirements of different paint film thicknesses, making it flexible to use, easy to disassemble and assemble, and widely applicable.

[0040] The second and third painting molds 2 and 3 are set up to spray paint the electromagnetic wire 8 in a rotating manner with the electromagnetic wire 8 as the center. This forms a first and second heat-resistant paint layer with an alternating spiral shape on the surface of the electromagnetic wire 8. This not only improves the torsional resistance of the wire and enhances its anti-torsion performance, but also improves the heat resistance of the electromagnetic wire 8 by stacking the first and second heat-resistant paint layers. In addition, it increases the contact area between the first insulating paint layer, the first heat-resistant paint layer, the second heat-resistant paint layer, and the second insulating paint layer, thereby improving the adhesion between the paint layers.

[0041] The oven 5 is equipped with guide wheels 52 on both the inlet and outlet sides. These guide the transmission direction of the electromagnetic wire 8, ensuring that the electromagnetic wire 8 can smoothly enter the oven 5 for drying after passing through the first painting mold 1, the second painting mold 2, the third painting mold 3, and the fourth painting mold 4.

[0042] The ends of the first painting mold 1 and the fourth painting mold 4 are both spliced ​​with adjustment sleeves 6. The adjustment sleeve 6 includes a fixed section 61 and a rotating section 62. The rotating section 62 is in a rotating state when working. The rotating section 62 is provided with a conical hole 63. Several scrapers 64 are evenly provided along the circumferential direction on the inner wall of the conical hole 63. The scrapers 64 are axially slidably connected to the conical hole 63. On the side of the scraper 64 facing the electromagnetic wire 8, oil felt 65 and felt 66 are arranged in sequence along the conveying direction of the electromagnetic wire 8. Paint liquid is attached to the oil felt 65.

[0043] By moving the scraper along the axis of the conical hole 63, the spacing between adjacent scrapers 64 can be adjusted, thereby changing the diameter of the scraping opening formed by the multiple scrapers 64 to meet the paint layer thickness requirements. The electromagnetic wire enters the adjusting sleeve 6. The adjusted positions of the multiple scrapers 64 limit the diameter of the scraping openings formed by the multiple scrapers 64 to meet the painting requirements. Rotating the rotating section 62, the multiple scrapers 64 first perform a touch-up painting operation on the surface of the electromagnetic wire 8 using the felt 65. This replenishes paint to pinholes and uneven areas on the electromagnetic wire 8, preventing paint breaks at various points during the painting process and improving the uniformity and quality of the paint layer on the electromagnetic wire 8. Then, the felt 66 evenly removes excess paint from the electromagnetic wire 8, improving the accuracy of paint layer thickness control and the quality of the electromagnetic wire 8. Excess paint can be absorbed by the felt 65.

[0044] The inner wall of the conical hole 63 is provided with several axially distributed magnetic tracks 67 along the circumferential direction. The scraper 64 is slidably connected to and attracted to the magnetic tracks 67. The magnetic tracks 67 are arranged inside the conical hole 63, and the scraper 64 is made of ferromagnetic material, which allows for high adhesion between the scraper 64 and the magnetic tracks 67, resulting in high connection stability. Furthermore, the scraper 64 moves along the magnetic tracks 67 without easily deviating, thus accurately changing the treatment aperture of the paint layer. In addition, adjacent scrapers 64 can be connected by telescopic rods to ensure synchronous movement of multiple scrapers 64, preventing misalignment.

[0045] The first painting mold 1 and the third painting mold 3 are located on the same side, and the second painting mold 2 and the fourth painting mold 4 are located on the same side. The rotating section 62 of the first painting mold 1 and the fourth painting mold 4 are each fitted with a first passive pulley 14, and the second painting mold 2 and the third painting mold 3 are each fitted with a second passive pulley 24. The first passive pulley 14 of the first painting mold 1 and the second passive pulley 24 of the third painting mold 3 are connected by a synchronous belt 15. The first passive pulley 14 of the first painting mold 1 is connected to the driving pulley of the first drive motor 16 via the synchronous belt 15. The second passive pulley 24 of the second painting mold 2 and the first passive pulley 14 of the fourth painting mold 4 are connected by a synchronous belt 15. The second passive pulley 24 of the second painting mold 2 is connected to the driving pulley of the second drive motor 25 via the synchronous belt 15. The rotation direction of the first drive motor 16 is opposite to the rotation direction of the second drive motor 25. During operation, the first drive motor 16 drives the rotating section 62 on the first painting mold 1 to rotate forward, causing multiple scrapers 64 to rotate and replenish and scrape off excess paint on the surface of the electromagnetic wire 8, ensuring the thickness of the paint layer. At the same time, the rotating section 62 on the first painting mold 1 drives the third painting mold 3 to rotate forward, spraying a second heat-resistant paint in a forward spiral on the surface of the electromagnetic wire. The second drive motor 25 drives the second painting mold 2 to rotate in the reverse direction, spraying a second heat-resistant paint in a reverse spiral on the surface of the electromagnetic wire. At the same time, the second painting mold 2 drives the rotating section 62 of the fourth painting mold 4 to rotate in the reverse direction, causing multiple scrapers 64 to rotate and replenish and scrape off excess paint on the surface of the electromagnetic wire 8, ensuring the thickness of the paint layer.

[0046] The first painting mold 1 has a tension support 7 at its inlet front side. The tension support 7 has an inclined sliding groove, within which a tension wheel 71 is movably connected. The tension wheel 71 is pulled by an inclined tension spring 72, ensuring its balance. A micro switch 73 is located on one side of the tension spring 72. The contact of the micro switch 73 extends into the gap of the tension spring 72 but does not contact it. The micro switch 73 is connected to an alarm via a controller. Under stable tension, the tension spring 72 remains unchanged, and the micro switch 73 is not triggered. When the tension changes, the tension spring 72 deforms, touching the contact of the micro switch 73, triggering the alarm. This allows for timely detection and adjustment of the electromagnetic wire tension.

[0047] The mold sleeves 11 are connected by mortise and tenon joints or by connecting flanges. The number of mold sleeves 11 can be increased or decreased, or mold sleeves 11 with different hole diameters can be replaced, depending on the required paint film thickness, to meet the requirements and facilitate easy assembly and disassembly. Furthermore, a drip tray can be provided below the first painting mold 1 and the fourth painting mold 4 to collect excess leaked paint.

[0048] The parts of this invention not described in detail are prior art.

Claims

1. A coating process for high-thermal-grade electromagnetic wire, characterized in that: Includes the following steps: S1. The electromagnetic wire (8) is fed into the first coating mold (1). After being wrapped with a certain thickness of first insulating varnish, it passes through the core hole of the mold core with a stepped decrease in aperture in sequence. The varnish layer is scraped off repeatedly to achieve the required varnish film thickness of the first insulating varnish and obtain product A. S2. Place product A into the oven (5) to dry and shape it, and then place it into the second painting mold (2). Rotate the second painting mold (2). During this period, spray the first heat-resistant paint around product A as the center, and form the first heat-resistant paint in a reverse spiral on the surface of product A to obtain product B. S3. Place product B into an oven (5) to dry and set its shape, and then place it into the third painting mold (3). Rotate the third painting mold (3) in the opposite direction to the rotation of the second painting mold (2). During this process, spray the second heat-resistant paint around product B as the center, forming a positive spiral of the second heat-resistant paint on the surface of product B, thus obtaining product C. S4. Send product C into the oven (5) to dry and shape it, and then send it into the fourth coating mold (4). After being wrapped with a certain thickness of second insulating varnish, it passes through the core hole of the mold core with a stepped decrease in aperture in sequence. The varnish layer is scraped off multiple times to achieve the required varnish film thickness of the second insulating varnish and obtain the finished product. The painting process is carried out using a high-heat-grade electromagnetic wire painting mold. The painting mold includes a first painting mold (1), a second painting mold (2), a third painting mold (3), and a fourth painting mold (4) which are respectively set at the inlet and outlet of the oven (5). The first painting mold (1) and the third painting mold (3) are located on the same side, and the second painting mold (2) and the fourth painting mold (4) are located on the same side. The first painting mold (1) and the fourth painting mold (4) each include several interlocking mold sleeves (11). A mold core (12) is provided inside the mold sleeve (11). The diameter of the core hole of the mold core in different mold sleeves (11) decreases sequentially according to the conveying direction of the electromagnetic wire (8). The first mold sleeve (11) is provided with a first paint spray head (13). The second painting mold (2) and the third painting mold (3) are in a rotating state when working and rotate in opposite directions. The second painting mold (2) and the third painting mold (3) are in a rotating state. The third painting mold (3) is provided with a liquid storage chamber (21) and a through painting hole (22). The liquid storage chamber (21) is filled with paint liquid. The painting hole (22) is provided with a second paint spray head (23). The second paint spray head (23) is connected to the liquid storage chamber (21) via a liquid pump. The ends of the first painting mold (1) and the fourth painting mold (4) are spliced ​​with an adjustment sleeve (6). The adjustment sleeve (6) includes a fixed section (61) and a rotating section (62). The rotating section (62) is in a rotating state when working. The rotating section (62) is provided with a conical hole (63). Several scrapers (64) are provided along the circumferential direction on the inner wall of the conical hole (63). The scrapers (64) are axially slidably connected to the conical hole (63). On the side of the scraper (64) facing the electromagnetic wire (8), an oil felt (65) and a felt (66) are provided in sequence along the conveying direction of the electromagnetic wire (8). The oil felt (65) is attached with paint liquid.

2. The coating process for high-thermal-grade electromagnetic wire according to claim 1, characterized in that: The inner wall of the conical hole (63) is provided with a number of axially distributed magnetic tracks (67) along the circumferential direction. The scraper (64) is slidably connected to the magnetic tracks (67) and attracted to each other.

3. The coating process for high-thermal-grade electromagnetic wire according to claim 1, characterized in that: The first painting mold (1) and the fourth painting mold (4) are each fitted with a first passive pulley (14) on the outside of the rotating section (62). The second painting mold (2) and the third painting mold (3) are each fitted with a second passive pulley (24). The first passive pulley (14) of the first painting mold (1) and the second passive pulley (24) of the third painting mold (3) are connected by a synchronous belt (15). The first passive pulley (14) of the first painting mold (1) is connected to the driving pulley of the first drive motor (16) via the synchronous belt (15). The second passive pulley (24) of the second painting mold (2) and the first passive pulley (14) of the fourth painting mold (4) are connected by a synchronous belt (15). The second passive pulley (24) of the second painting mold (2) is connected to the driving pulley of the second drive motor (25) via the synchronous belt (15). The rotation direction of the first drive motor (16) is opposite to the rotation direction of the second drive motor (25).

4. The coating process for high-thermal-grade electromagnetic wire according to claim 1, characterized in that: The first painting mold (1) is also provided with a tension bracket (7) at the front of the inlet. The tension bracket (7) is provided with a sliding groove. A tension wheel (71) is movably connected in the sliding groove. The tension wheel (71) is pulled by a tension spring (72). A micro switch (73) is provided on one side of the tension spring (72). The contact of the micro switch (73) extends into the gap of the tension spring (72) and does not contact the tension spring (72). The micro switch (73) is connected to the alarm via the controller.

5. The coating process for high-thermal-grade electromagnetic wire according to claim 1, characterized in that: The mold sleeves (11) are connected by mortise and tenon joints or by connecting flanges.

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