Corona-resistant winding wire coating device and coating method thereof

Abstract

The invention discloses a coating device of a corona-resistant winding wire and a coating method thereof, and belongs to the technical field of electrostatic coating, the coating device comprises a transmission table arranged in an electrostatic coating chamber, the transmission table comprises an upper transmission table and a lower transmission table, a deflection control motor is arranged in the lower transmission table, the deflection control motor is connected with a bearing base through a deflection control piece, and the bearing base is connected with the upper transmission table and the lower transmission table. The bearing base is connected with a coating rotating shaft through a self-rotating driving part, a coating bearing disc is fixedly connected to the upper portion of the coating rotating shaft, and the coating bearing disc is connected with a heating built-in coating part through a synchronous control moving part. According to the invention, through the heating built-in coating piece extending into the rotor, powder is directly sprayed on key parts such as the fitting surface of the guide strip and the iron core from the inside, so that the defect that the inside cannot be permeated in the traditional electrostatic coating is effectively avoided, and an internal structure which determines the mechanical strength and reliability can be effectively coated and fixedly sealed; and the problem of loosening of the conducting bar under high-speed centrifugal force is radically prevented.

Description

Technical Field

[0001] This invention relates to the field of electrostatic coating technology, and in particular to a coating apparatus and method for corona-resistant winding wires. Background Technology

[0002] Winding coating is a key process that transforms a "loose" coil into a "robust, insulating, thermally conductive, and moisture-proof" integrated functional component. With technological advancements, higher demands are placed on the environmental friendliness (solvent-free, water-based), high-temperature resistance, and automation and intelligence of the coating process of insulating varnish. During the coating process, the motor rotor, due to its special structure, is often coated uniformly using electrostatic powder coating. Due to the special structure of the motor rotor, its surface exhibits the "Faraday cage effect," meaning that the electrostatic varnish powder can only uniformly coat the outer circumference and end surfaces of the rotor, but cannot penetrate to the mating surface between the conductor bars and the iron core, which is crucial for mechanical strength and reliability. As a result, the conductor bars of the coated rotor will still loosen under high-speed centrifugal force, failing to achieve the core purpose of coating. Based on this, a coating device and method for corona-resistant winding wire are proposed. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art by proposing a coating device and coating method for corona-resistant winding wires.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A coating device for corona-resistant winding wire includes a transmission table disposed in an electrostatic coating chamber. The transmission table includes an upper transmission table and a lower transmission table. A deflection control motor is disposed in the lower transmission table. The deflection control motor is connected to a support base via a deflection control component. The support base is connected to a coating shaft via a spin drive component. A coating support plate is fixedly connected above the coating shaft. The coating support plate is connected to a heating internal coating component via a synchronous control movement component.

[0006] The upper transmission platform is equipped with a lifting base plate by a lifting control component. A bearing shaft is rotatably arranged below the lifting base plate. A docking upper pressure plate is fixedly connected to the bottom of the bearing shaft. A follow-up feeding docking component is provided on the docking upper pressure plate for feeding the heating internal coating component.

[0007] The heating internal coating component includes an internal composite layer and a partition coating layer disposed on the side wall of the internal composite layer. The internal composite layer is equipped with a high-frequency heating device for heating the motor rotor. The internal composite layer has multiple coating injection holes. The follow-up feeding docking component is equipped with a high-pressure feeding pipe connected to the coating injection holes.

[0008] As a preferred embodiment, the deflection control component includes a deflection rod seat fixedly connected to the output end of the control motor, and the other end of the deflection rod seat is fixedly connected to the bearing base.

[0009] As a preferred embodiment, the spin drive includes a spin gear rotatably disposed at the bottom of the support base, the inner wall of the spin gear having a keyway, and the coated rotating shaft extending downward through the support base and connected to the keyway via a sliding key.

[0010] The coating bearing plate is connected to the bearing base through a sleeve spring sleeved on the outer wall of the coating shaft.

[0011] As a preferred embodiment, the synchronous control moving component includes multiple drive rail seats arranged around the coating support plate and the docking pressure plate. Each drive rail seat contains a sliding rail block driven by an electric push rod. The sliding rail block located on the coating support plate is fixedly connected to the bottom of the internal composite layer.

[0012] As a preferred embodiment, the follow-up feeding docking component includes a feeding docking interface opened above the internal injection composite layer, and a docking pipe component that docks with the feeding docking interface is provided at the bottom of the sliding rail block located on the docking pressure plate.

[0013] As a preferred embodiment, the lifting control component includes a support base connected to the upper transmission platform by bolts, a deflection follower disk rotatably disposed at the bottom of the support base, a lifting push rod disposed on the deflection follower disk, and the output end of the lifting push rod being connected to the lifting base plate.

[0014] As a preferred embodiment, both the coated bearing plate and the mating pressure plate are provided with conical positioning seals for sealing and fixing the motor rotor bearing end.

[0015] A coating method for corona-resistant winding wire includes a preparation and clamping stage, a preheating and transfer stage, a co-coating stage, and a preliminary curing and cyclic coating stage.

[0016] Specifically, the following steps are included:

[0017] S1. Preparation and clamping: Place the motor rotor to be coated on the conical positioning seal of the coating bearing plate below to perform preliminary positioning and sealing of the bearing end;

[0018] Control the lifting push rod to drive the lifting base plate and the docking pressure plate to move downwards and dock with the upper end of the motor rotor, and together with the coating bearing plate below, clamp and fix the motor rotor.

[0019] As the pressure plate descends, the bottom connecting pipe inserts into the material supply interface of the internally heated coating component below, completing the connection of the internal spray coating material supply path.

[0020] S2. Preheating and Transmission: Activate the high-frequency heating device inside the heating element to preheat the inside of the motor rotor;

[0021] The upper and lower conveyor platforms start synchronously, transporting the fixed motor rotor to the spraying station in the electrostatic coating chamber;

[0022] S3, Collaborative Spraying: An external spraying device performs electrostatic powder spraying on the outer circle and end surfaces of the motor rotor;

[0023] The powder is sprayed into the interior of the motor rotor (especially the mating surface between the guide bars and the iron core) through the follow-up feeding dock and the high-pressure feeding pipe;

[0024] S4. Circulating Coating: The deflection control motor drives the entire bearing base and motor rotor to deflect through the deflection rod seat, moving it from the spraying station to the heating station. The high-frequency heating device is activated, heating the powder from the inside. Using the ambient heat of the heating station, the powder is heated from the outside. Under the dual heating from inside and outside, the powder electrostatically adsorbed on the inner and outer surfaces of the rotor melts rapidly, forming a preliminary cured coating.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. This invention uses a heated internal coating component that extends into the rotor to directly spray powder onto key areas such as the mating surfaces of the guide bars and the iron core. This effectively avoids the shortcomings of traditional electrostatic coating, which cannot penetrate the interior. It fundamentally solves the industry problem of uneven coating and loose guide bars caused by the "Faraday cage effect" in motor rotors. It ensures that the internal structure, which determines mechanical strength and reliability, can also be effectively coated and sealed, thus preventing the problem of guide bars loosening under high-speed centrifugal force from the root.

[0027] 2. This invention employs a "dual heating" mechanism that combines internal high-frequency heating with external environmental heating. This mechanism enables multiple coating and melting processes, resulting in a thicker and denser insulating coating. This significantly improves the corona resistance and overall insulation level of the winding. Heating causes the powder to melt and level rapidly, enhancing the bonding between the coating and the substrate, as well as between the layers of the coating. This creates a "robust, insulating, thermally conductive, and moisture-proof" whole, improving the coating quality and bonding strength, and ensuring the final performance. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural schematic diagram of a coating device for corona-resistant winding wire proposed in this invention;

[0029] Figure 2 This is a schematic diagram of the assembly structure of a coating device for corona-resistant winding wire proposed in this invention;

[0030] Figure 3This is a schematic diagram of the structure of the coating device for corona-resistant winding wire proposed in this invention, which is installed on the lower transmission platform.

[0031] Figure 4 This is a schematic diagram showing the positional relationship of a coating device for corona-resistant winding wire proposed in this invention.

[0032] Figure 5 This is a schematic diagram of the structure of the coating device for corona-resistant winding wire proposed in this invention, which is installed on the upper transmission platform.

[0033] Figure 6 This is a schematic diagram of the installation structure of the heating internal coating component in the coating device for a corona-resistant winding wire proposed in this invention.

[0034] Figure 7 This is a flowchart of a coating method for corona-resistant winding wire proposed in this invention.

[0035] In the diagram: 1. Upper transfer platform; 2. Lower transfer platform; 3. Deflection control motor; 4. Bearing base; 5. Coating shaft; 6. Coating bearing plate; 7. Lifting base plate; 8. Bearing shaft; 9. Connecting upper pressure plate; 10. Internal composite layer; 11. Partition coating; 12. High-frequency heating device; 13. Coating spray hole; 14. Deflection rod seat; 15. Spinning gear; 16. Sliding key; 17. Sleeve spring; 18. Drive support rail seat; 19. Electric push rod; 20. Sliding rail block; 21. Feeding interface; 22. Connecting pipe fitting; 23. Support seat; 24. Deflection following plate; 25. Lifting push rod; 26. Conical positioning seal. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Example, refer to Figures 1 to 7 A coating device and method for corona-resistant winding wires are disclosed. The device includes a transmission table set in an electrostatic coating chamber. One side of the electrostatic coating chamber is set as a heating station and the other side is set as a spraying station. The spraying station is used to uniformly spray powder onto the winding material to be coated. The transmission table includes an upper transmission table 1 and a lower transmission table 2. The transmission table is a circulating conveying device, which is existing technology and will not be described in detail here. Its main purpose is to circulate and convey the coating device. A deflection control motor 3 is set in the lower transmission table 2. The deflection control motor 3 is connected to a bearing base 4 through a deflection control component. The deflection control motor 3 is used to rotate, driving the deflection control component to deflect the motor rotor installed on the bearing base 4, thereby moving it from the heating station on one side to the dust spraying surface on the other side. Further, the deflection control component includes a deflection rod seat 14 fixedly connected to the output end of the control motor. The other end of the deflection rod seat 14 is fixedly connected to the bearing base 4. The deflection following disk 24 and the deflection rod seat 14 deflect synchronously when rotating.

[0040] The support base 4 is connected to the coating shaft 5 via a spin drive component. Further, the spin drive component includes a spin gear 15 rotatably disposed at the bottom of the support base 4. A keyway is provided on the inner wall of the spin gear 15. The coating shaft 5 extends downward through the support base 4 and is connected to the keyway via a sliding key 16. A rack that works with the spin gear 15 is provided in the electrostatic coating chamber, so that when the coating support plate sprays powder at the spraying station, the motor rotor can be rotated to achieve uniform adsorption of dust on the surface of the motor rotor.

[0041] It should be noted that the keyway and sliding key 16 cooperate to achieve a sliding connection between the spin gear 15 and the coating shaft 5. This ensures that the coating bearing disk 6 can move elastically under the elastic support of the sleeved spring 17, while also ensuring the rotational connection effect.

[0042] The coating support plate 6 is connected to the support base 4 through a sleeve spring 17 sleeved on the outer wall of the coating shaft 5. The coating support plate 6 is supported by the elastic support connection to ensure that the elastic support effect can be met when the lifting control component drives the docking pressure plate 9 to move downward, so as to ensure that the coating processing can be carried out on windings of different lengths.

[0043] A coating support plate 6 is fixedly connected above the coating shaft 5. The coating support plate 6 is connected to a heating internal coating component through a synchronous control moving component. The heating internal coating component includes an internal composite layer 10 and a partition coating layer 11 set on the side wall of the internal composite layer 10. A high-frequency heating device 12 for heating the motor rotor is set inside the internal composite layer 10. Multiple coating injection holes 13 are opened on the internal composite layer. A high-pressure feeding pipe connected to the coating injection holes 13 is set on the follow-up feeding docking component.

[0044] It should be noted that after the high-frequency heating device 12 is turned on, it will heat the surface of the motor rotor on both sides. It has multiple power levels and can preheat the motor rotor before coating. During the coating process, by turning on the high-frequency heating device 12, the coating material electrostatically adsorbed on the electronic rotor is heated and melted in advance, so as to achieve the effect of multi-layer heating and multiple coating.

[0045] Furthermore, the synchronous control moving component includes multiple drive rail seats 18 arranged around the coating support plate 6 and the docking pressure plate 9. The drive rail seats 18 are provided with sliding rail blocks 20 driven by electric push rods 19. The sliding rail blocks 20 located on the coating support plate 6 are fixedly connected to the bottom of the inner composite layer 10.

[0046] Both the coating bearing plate 6 and the mating pressure plate 9 are equipped with conical positioning seals 26 to seal and fix the motor rotor bearing end, which can effectively position the motor rotor to avoid coating on the bearing connection end.

[0047] The upper transmission platform 1 is equipped with a lifting base plate 7 via a lifting control component. A bearing shaft 8 is rotatably mounted below the lifting base plate 7. Furthermore, the lifting control component includes a support base 23 connected to the upper transmission platform 1 by bolts. A deflection follower disk 24 is rotatably mounted at the bottom of the support base 23. A lifting push rod 25 is mounted on the deflection follower disk 24. The output end of the lifting push rod 25 is connected to the lifting base plate 7. The lifting push rod 25 is used to control the lifting base plate 7 to move upward.

[0048] The bottom of the bearing shaft 8 is fixedly connected to the upper pressure plate 9, and the upper pressure plate 9 is provided with a follow-up feeding docking part for feeding the heating internal coating parts;

[0049] Furthermore, the follow-up feeding docking component includes a feeding interface 21 opened above the internal injection composite layer. The bottom of the sliding rail block 20 located on the docking pressure plate 9 is provided with a docking pipe 22 that docks with the feeding interface 21. By inserting the docking pipe 22 into the feeding interface 21, the coating powder is transported to the coating spray hole 13 and then sprayed outward, realizing direct internal powder spraying, so as to effectively avoid the uneven spraying inside the motor rotor caused by the "Faraday cage effect".

[0050] In this invention, when coating a motor rotor, the motor rotor is placed on the conical positioning seal 26 on the coating support plate 6. At this time, the control is set to the lifting push rod 25 to drive the lifting base plate 7 to move downward, so that the docking upper pressure plate 9 set on the lifting base plate 7 moves downward. The downward movement of the docking upper pressure plate 9 will achieve docking with the upper part of the motor rotor, and then, with the cooperation of the coating support plate 6, the motor rotor is clamped and fixed. When the docking upper pressure plate 9 moves downward, it will be inserted into the feeding interface 21 through the docking pipe 22, so as to transport the coating powder into the coating spray hole 13 and then spray it outward.

[0051] At this time, the motor rotor is preheated by activating the high-frequency heating device 12 installed in the inner composite layer 10. After preheating, the surface of the motor rotor to be coated is ensured to be absolutely dry. Then, under the combined action of the upper conveyor 1 and the lower conveyor 2, the motor rotor is transported to the powder coating station. The external spraying device sprays powder onto the outside of the motor rotor. The powder is adsorbed onto the surface of the motor rotor under the action of electrostatics. At the same time, the coating spraying holes 13 installed on the inner composite layer 10 spray powder to the inside of the motor rotor, which is prone to the "Faraday cage effect". This ensures that the inside and outside of the motor rotor are uniformly coated. During the coating process, the deflection control motor 3 changes the position of the motor rotor, moving it to the heating station. At this time, the inside of the motor rotor is heated by the high-frequency heating device 12, and the outside is heated by the heating station. This allows the powder adsorbed on the surface of the motor rotor by electrostatics to melt quickly. After melting, the powder can be coated again. This process can be repeated to achieve multiple coatings, ensuring the corona resistance of the motor windings.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A coating apparatus for corona-resistant winding wire, comprising a transfer table disposed within an electrostatic coating chamber, characterized in that, The transmission platform includes an upper transmission platform (1) and a lower transmission platform (2). A deflection control motor (3) is installed inside the lower transmission platform (2). The deflection control motor (3) is connected to a bearing base (4) through a deflection control component. The bearing base (4) is connected to a coating shaft (5) through a spin drive component. A coating bearing disk (6) is fixedly connected above the coating shaft (5). The coating bearing disk (6) is connected to a heating internal coating component through a synchronous control movement component. The upper transmission platform (1) is equipped with a lifting base plate (7) by a lifting control component. A bearing shaft (8) is rotatably arranged below the lifting base plate (7). A docking upper pressure plate (9) is fixedly connected to the bottom of the bearing shaft (8). A follow-up feeding docking component for feeding the heating internal coating component is provided on the docking upper pressure plate (9). The heating internal coating component includes an internal composite layer (10) and a partition coating layer (11) disposed on the side wall of the internal composite layer (10). The internal composite layer (10) is provided with a high-frequency heating device (12) for heating the motor rotor. The internal composite layer is provided with multiple coating injection holes (13). The follow-up feeding docking component is provided with a high-pressure feeding pipe connected to the coating injection holes (13).

2. The coating apparatus for corona-resistant winding wire according to claim 1, characterized in that, The deflection control component includes a deflection rod seat (14) fixedly connected to the output end of the control motor, and the other end of the deflection rod seat (14) is fixedly connected to the bearing base (4).

3. The coating apparatus for corona-resistant winding wire according to claim 1, characterized in that, The spin drive includes a spin gear (15) rotatably disposed at the bottom of the support base (4). The inner wall of the spin gear (15) is provided with a keyway. The coated rotating shaft (5) extends downward through the support base (4) and is connected to the keyway via a sliding key (16). The coating bearing plate (6) is connected to the bearing base (4) through a sleeve spring (17) sleeved on the outer wall of the coating shaft (5).

4. The coating apparatus for corona-resistant winding wire according to claim 1, characterized in that, The synchronous control moving component includes multiple drive rail seats (18) arranged around the coating support plate (6) and the docking pressure plate (9). The drive rail seat (18) is provided with a sliding rail block (20) driven by an electric push rod (19). The sliding rail block (20) located on the coating support plate (6) is fixedly connected to the bottom of the inner composite layer (10).

5. The coating apparatus for corona-resistant winding wire according to claim 4, characterized in that, The follow-up feeding docking component includes a feeding docking interface (21) opened above the inner injection composite layer, and a docking pipe component (22) that docks with the feeding docking interface (21) is provided at the bottom of the sliding rail block (20) located on the docking upper pressure plate (9).

6. The coating apparatus for corona-resistant winding wire according to claim 1, characterized in that, The lifting control component includes a support base (23) connected to the upper transmission platform (1) by bolts. A deflection follower disk (24) is rotatably provided at the bottom of the support base (23). A lifting push rod (25) is provided on the deflection follower disk (24). The output end of the lifting push rod (25) is connected to the lifting base plate (7).

7. The coating apparatus for corona-resistant winding wire according to claim 1, characterized in that, Both the coated bearing plate (6) and the mating pressure plate (9) are provided with conical positioning seals (26) for sealing and fixing the motor rotor bearing end.

8. The coating method proposed by the coating apparatus for a corona-resistant winding wire according to any one of claims 1-7, characterized in that, It includes the preparation and clamping stage, the preheating and transfer stage, the collaborative spraying stage, and the initial curing and cyclic coating stage; Specifically, the following steps are included: S1. Preparation and clamping: Place the motor rotor to be coated on the conical positioning seal (26) of the coating bearing plate (6) below to perform preliminary positioning and sealing of the bearing end; Control the lifting push rod (25) to move, drive the lifting base plate (7) and the docking pressure plate (9) to move downward, dock with the upper end of the motor rotor, and together with the coating bearing plate (6) below, clamp and fix the motor rotor. As the pressure plate (9) descends, the bottom connecting pipe (22) is inserted into the feeding interface (21) of the inner heating coating component below, thus completing the connection of the feeding path for internal spraying. S2, Preheating and Transmission: Turn on the high-frequency heating device (12) inside the heating internal coating to preheat the inside of the motor rotor; The upper and lower conveyor platforms start synchronously, transporting the fixed motor rotor to the spraying station in the electrostatic coating chamber; S3, Collaborative Spraying: An external spraying device performs electrostatic powder spraying on the outer circle and end surfaces of the motor rotor; The powder is sprayed into the motor rotor through the coating spray hole (13) via the follow-up feeding dock and the high-pressure feeding pipe; S4. Circulating coating: The deflection control motor (3) drives the entire bearing base (4) and motor rotor to deflect through the deflection rod seat (14), moving it from the spraying station to the heating station, turning on the working state of the high-frequency heating device (12), heating the powder from the inside, and using the ambient heat of the heating station to heat the powder from the outside. Under the dual heating inside and outside, the powder electrostatically adsorbed on the inner and outer surfaces of the rotor melts rapidly, forming a preliminary cured coating.

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