Enameled wire multi-layer surface paint treatment process

Abstract

The invention discloses a multi-layer surface paint treatment process for an enameled wire, and relates to the technical field of enameled wire production. A multi-layer surface paint treatment process for an enameled wire comprises the steps of unwinding and stretching, annealing and softening, paint curing, inspection and winding and the like, in the paint curing process, a wire can be painted, baked and cooled through a paint coating mechanism, a drying oven and a cooling box in a paint coating device, and the surface of the enameled wire is coated with paint. And then the surface paint is conveyed to the feeding side of the painting mechanism again through the guide mechanism, so that a plurality of painting and curing procedures can be repeatedly carried out, and the coating of multi-layer surface paint is realized. Only one painting device is needed in the multi-layer surface paint coating process of the whole enameled wire, so that the requirement of production equipment for producing the enameled wire with the multi-layer surface paint on a production site can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of enameled wires, in particular to a multi-layer surface paint treatment process for enameled wires. Background Art

[0002] Enameled wire is a main type of winding wire, usually used to manufacture insulated wires for coils or windings in electrical products. The specific enameled wire is mainly composed of two parts: a bare metal wire and a surface insulating paint layer. Its production process mainly includes the steps of unwinding, annealing, painting, baking, cooling, and winding. The number of times the surface of the enameled wire is painted and the thickness of the paint layer vary depending on the application environment of the enameled wire. Some enameled wires with high insulation requirements will undergo multiple painting processes during the production process so that the surface of the enameled wire can be protected by multiple layers of insulating paint.

[0003] At present, most of the enameled wire painting equipment still uses semi-immersion equipment, that is, a wire groove is opened on the surface of the paint roller, and then the bottom of the paint roller is immersed in the insulating paint, and the metal bare wire passes through the top of the wire groove, so that the insulating paint can enter the wire groove to wet the copper wire and achieve the painting effect by rotating the paint roller. However, the traditional painting process is prone to uneven distribution of paint liquid on the metal bare wire, and it is easy to cause surface paint leakage, cavitation or local accumulation of liquid, etc., the painting uniformity is poor, the effect is low and the yield is not high. In addition, since each painting needs to go through baking, cooling and other processes, the enameled wire production line equipment with multi-layer surface paint will be set up very long, which undoubtedly requires a large area of ​​​​the production site. Summary of the invention

[0004] In order to optimize the production line structure, improve the coating process of the multi-layer surface paint of the enameled wire, and improve the uniformity and yield rate of the surface paint layer of the enameled wire, the present application provides a multi-layer surface paint treatment process for the enameled wire.

[0005] The present application provides a multi-layer surface coating treatment process for enameled wires using the following technical solutions: A multi-layer surface paint treatment process for enameled wire, comprising the following steps: S1. Unwinding and stretching: Use the unwinding mechanism to unwind and stretch the pre-prepared bare metal wire to obtain the wire, and then make the wire maintain a certain unwinding tension to be pulled into the next process; S2, annealing and softening: heating and annealing the wire in step S1, and then pulling it to the next process; S3, painting and curing: the annealed wire is painted, baked and cooled in sequence by using a painting device, and this is a painting and curing process. Depending on the type of surface paint, multiple painting and curing processes need to be repeated; S4, inspection and winding: the wire after the paint is cured is inspected by the inspection mechanism, and the wire is wound up with a certain winding tension by the winding mechanism to obtain an enameled wire with a multi-layer surface paint; Among them, in the S3 paint curing process, the painting device includes a painting mechanism, an oven, a cooling box and a guiding mechanism. After the wire comes out of the previous process, it enters the painting mechanism, the oven and the cooling box in sequence. The painting mechanism is arranged on one side of the oven. The painting mechanism is used to paint the wire. The oven and the cooling box are used to heat, bake and cool the painted wire respectively. The guiding mechanism is used to guide the wire to circulate through the painting mechanism, the oven and the cooling box.

[0006] By adopting the above technical solution, after the wire has completed the current surface paint coating, the guide mechanism can guide the wire to be re-transmitted to the feeding side of the painting mechanism, and then the wire can continue to be coated with the next layer of surface paint, and the cycle will be continued until the wire surface is completely coated. The multi-layer surface paint coating process of the entire enameled wire only needs to use one painting device, without adding additional equipment, which can effectively reduce the demand for production sites. In addition, for different types of surface paints, multiple cycles of painting and curing processes can not only effectively ensure that different types of surface paints can be fully adhered and improve the adhesion strength of each layer of surface paint, but also help to improve the uniformity of different layers of surface paint, and it is not easy to produce undesirable conditions such as surface paint leakage, cavitation or local accumulation.

[0007] Optionally, the painting mechanism includes a paint tank frame, a mold frame, a painting assembly and a plurality of paint diameter molds, the mold frame is fixedly arranged in the paint tank frame, a pressing plate is arranged at one end of the mold frame away from the temperature control mechanism, a plurality of wire hole grooves are formed between the pressing plate and the mold frame, and the painting assembly is used to apply insulating paint to the bare metal wires passing through the wire hole grooves; Several groups of the paint diameter molds are arranged horizontally in sequence and installed on one end of the mold frame away from the pressure plate. The paint diameter molds are provided with paint scraping holes. The paint scraping holes are flush with the wire hole grooves and correspond one to one. The diameters of the paint scraping holes of the several groups of the paint diameter molds gradually and evenly increase along the arrangement.

[0008] By adopting the above technical scheme, several groups of paint diameter dies can scrape off excess insulating paint coated on the surface of the wire through paint scraping holes with gradually increasing apertures, so that each layer of insulating paint coated on the surface of the wire can maintain a uniform increase, which is beneficial to improving the uniformity of the surface paint of each layer of the enameled wire.

[0009] Optionally, the painting assembly includes a paint bucket and a paint spray pump, the paint bucket is located below the paint trough frame and is interconnected with the paint trough frame, the feed end of the paint spray pump is interconnected with the paint bucket, a paint flow channel interconnected with the wire hole groove is opened inside the mold frame, the paint spray pump is arranged directly below the mold frame, and the paint spray port of the paint spray pump is interconnected with the paint flow channel.

[0010] By adopting the above technical solution, not only can the wires in the wire hole grooves be fully painted, but also the splashing of insulating paint by the paint pump during spraying can be greatly reduced, which is beneficial to reducing the waste of insulating paint.

[0011] Optionally, a preheating pipe is provided between the paint bucket and the paint spray pump, and the preheating pipe is used to preheat the insulating paint to 40-80°C.

[0012] By adopting the above technical solution, the insulating paint is preheated using a preheating tube, which not only improves the fluidity of the insulating paint and is beneficial for spraying by the paint pump, but also the preheated insulating paint can be cured faster in the oven, which is beneficial to improving the curing efficiency of the insulating paint, thereby improving production efficiency.

[0013] Optionally, the paint scraping hole of the paint diameter mold includes an inlet area and an outlet area, and the opening cone angle of the inlet area is 70-85°.

[0014] By adopting the above technical solution and setting an entrance area with a larger opening cone angle, when the wire enters the paint scraping hole, excess insulating paint can quickly flow out of the paint scraping hole along the larger opening cone angle, which is helpful to prevent the wire from being adversely affected by excessive insulating paint accumulated in the paint diameter mold.

[0015] Optionally, the cooling box is arranged directly below the baking oven, and a plurality of groups of fans are arranged on the top side of the cooling box, and air outlets of the fans are directly facing the wires in the cooling box.

[0016] By adopting the above technical solution, the cooling box is set directly below the oven, which can effectively save the space occupied by the production line equipment and help improve the space utilization rate. In addition, by placing the air outlet of the fan directly at the wire, the fan can fully cool the wire and effectively improve the cooling efficiency of the wire, which is helpful to prevent the wire whose surface has not been completely cooled from affecting the adhesion and curing process of the next layer of insulating paint.

[0017] Optionally, a cooling pool is provided between the oven and the cooling box, and the cooling pool is located directly below the oven. The wire is guided by the guide mechanism and enters the cooling pool first and then the cooling box after coming out of the oven.

[0018] By adopting the above technical solution, by setting a cooling pool between the oven and the cooling box, the cooling pool can not only cool down the wire just out of the oven more quickly, but also perform preliminary cleaning of the wire. Since the insulating paint will produce a small amount of impurity powder attached to the surface of the wire during the incomplete baking process, the setting of the cooling pool can effectively remove the impurity powder on the surface of the wire, which is beneficial to prevent the impurity powder from causing adverse effects on the subsequent painting of the wire. Moreover, the cooling box located behind the cooling pool can not only air-dry the wire through the fan to prevent residual moisture from causing adverse effects on subsequent painting, but also in the process of air-drying, the evaporation of moisture on the surface of the wire absorbs heat, which is beneficial to further achieve cooling of the wire. In addition, the cooling pool is also set directly below the oven, which is beneficial to improve space utilization and save floor space for production line equipment.

[0019] Optionally, the unwinding mechanism is arranged on a side of the oven away from the painting mechanism. In the S2 annealing process, the wire is guided by the guide mechanism, and after coming out of the unwinding mechanism, it enters the oven for annealing, and then enters the painting mechanism.

[0020] By adopting the above technical solution, the oven can not only bake the insulating paint, but also anneal the wire, which is beneficial to improve the use efficiency of the oven. In addition, there is no need to configure an additional annealing furnace, which is beneficial to reduce the land demand of the overall production line equipment on the production site.

[0021] Optionally, in the S4 inspection and winding process, the inspection mechanism includes a detection tube and a sensor wheel group, the detection tube is used to inspect whether the wire has convex defects such as bubbles and putty, and the sensor wheel group is used to inspect whether the wire has paint film defects such as missing coating, bare wire, paint film fault, etc., and can alarm for wires with paint film defects; A sizing hole is provided inside the detection tube, and the diameter of the sizing hole is equal to the overall wire diameter of the target enameled wire.

[0022] By adopting the above technical solution, when a wire with raised defects such as bubbles and putty passes through the inspection tube, since the outer diameter of the enameled wire is larger than the diameter of the sizing hole of the inspection tube, it is not easy for the wire to pass through the inspection tube. However, under the high-speed traction of the winding mechanism, the wire can pass through the inspection tube, but at the same time the inspection tube will scrape off the raised part of the wire and cause paint film defects, so that the subsequent sensing wheel group can sense the paint film defects caused by the inspection tube and promptly alarm, which is conducive to the staff to promptly discover unqualified enameled wires, thereby ensuring the yield of the enameled wires.

[0023] Optionally, the induction wheel group includes a metal guide wheel, a conductive bracket and a powered sensor, the conductive brackets are arranged on both sides of the metal guide wheel, the two sides of the metal guide wheel are insulated and separated from each other, and are respectively connected to the conductive brackets on both sides for conduction, and the conductive brackets on both sides are connected to each other for conduction through the powered sensor.

[0024] By adopting the above technical solution, when wires with some areas missing coating or in a bare wire state bypass the induction wheel group, the wires will connect the two sides of the metal guide wheel, and then through the conduction of the conductive bracket, the energized sensor will be connected and alarm will be sounded, so that unqualified wires with paint film defects can be screened out, which is beneficial for staff to promptly discover unqualified enameled wires, thereby ensuring the yield of the enameled wires.

[0025] In summary, the technical solution of this application has at least one of the following beneficial effects: 1. Multi-layer surface paint coating of enameled wire can be achieved by adopting a painting device without adding additional equipment, which is conducive to reducing the demand for production site for production line equipment.

[0026] 2. By circulating multiple painting and curing processes, it can not only effectively ensure that different types of surface paints can be fully adhered and improve the adhesion strength of each layer of surface paint, but also help to improve the uniformity of different layers of surface paint, and it is not easy to cause undesirable conditions such as surface paint leakage, cavitation or local accumulation of liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a process flow chart of a multi-layer surface paint treatment process for enameled wire according to an embodiment of the present application.

[0028] Figure 2 This is a structural diagram of the overall equipment used in a multi-layer surface paint treatment process for enameled wire in an embodiment of the present application.

[0029] Figure 3 It is a wire threading route map of a multi-level surface paint treatment process for enameled wire in an embodiment of the present application, in which part of the equipment side wall has been hidden.

[0030] Figure 4 It is a structural schematic diagram of a painting device used in a multi-layer surface paint treatment process for enameled wire in an embodiment of the present application.

[0031] Figure 5 It is a structural schematic diagram of a painting mechanism used in a multi-layer surface paint treatment process for enameled wire according to an embodiment of the present application, in which some painting components are hidden.

[0032] Figure 6It is a cross-sectional view of a mold frame used in a multi-layer surface paint treatment process for enameled wire in an embodiment of the present application.

[0033] Figure 7 It is a cross-sectional view of a paint diameter mold used in a multi-layer surface paint treatment process for enameled wire in an embodiment of the present application.

[0034] Figure 8 It is a structural schematic diagram of a detection mechanism used in a multi-layer surface paint treatment process for enameled wire in an embodiment of the present application.

[0035] Description of reference numerals: 1. Unwinding mechanism; 11. Unwinding assembly; 12. Tension assembly; 2. Painting mechanism; 21. Paint trough frame; 211. Reflux pipe; 22. Mold frame; 221. Pressing plate; 222. Wire hole slot; 223. Paint flow channel; 23. Painting assembly; 231. Paint bucket; 232. Paint spray pump; 233. Preheating pipe; 24. Paint diameter mold; 241. Paint scraping hole; 2411. Entrance area; 2412. Exit area; 3. Oven; 4. Cooling pool; 5. Cooling box; 51. Fan; 6. Guide mechanism; 7. Inspection mechanism; 71. Detection tube; 711. Sizing hole; 72. Induction wheel group; 721. Metal guide wheel; 722. Conductive bracket; 723. Power-on sensor; 8. Rewinding mechanism. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-8 This application is described in further detail.

[0037] The present application embodiment discloses a multi-layer surface coating treatment process for enameled wire. Figure 1 , a multi-layer surface paint treatment process for enameled wire, comprising the following steps: S1, unwinding and stretching: refer to Figure 2 and Figure 3 The unwinding mechanism 1 is used to unwind the pre-prepared bare metal wire to obtain the wire material, and then the wire material is kept under traction tension to enter the next process.

[0038] The metal bare wire may be a copper wire or an iron wire. In this embodiment, a 0.2 mm copper wire is selected as the metal bare wire, and the setting range of the wire pulling tension is 250-270 g. Figure 2 The unwinding mechanism 1 includes an unwinding component 11 and a tension component 12, wherein the bare metal wire is unwound by the unwinding component 11 and is stretched around a roller by the tension component 12, so that the wire maintains a certain tension to facilitate traction in subsequent processes. In this embodiment, the unwinding component 11 and the tension component 12 can adopt existing devices.

[0039] S2, annealing softening: refer to Figure 2 and Figure 3 The wire material stretched in step S1 is heated to 450-550°C for annealing and softening, and then pulled to the next process.

[0040] S3, paint curing: refer to Figure 2 and Figure 3 The wire that has been annealed and softened in step S2 is introduced into a painting device to perform painting, baking and cooling processes in sequence, and this is used as a painting and curing process. For different levels of surface paint, the painting and curing process must be cyclically performed for no less than 2 times.

[0041] Reference Figure 2 and Figure 3 The painting device includes a painting mechanism 2, an oven 3, a cooling pool 4, a cooling box 5 and a guiding mechanism 6, wherein the painting mechanism 2 is used for painting the wire, the oven 3 is used for heating and baking the painted wire, so that the solvent in the insulating paint can be fully baked and volatilized, and the insulating paint can be fully solidified, the cooling pool 4 and the cooling box 5 are used to fully cool the baked wire, and the guiding mechanism 6 includes a plurality of groups of guide rollers and guide wheels, and the plurality of groups of guide rollers and guide wheels are reasonably distributed in the painting device. The wire can be guided by the cooperation of the plurality of groups of guide rollers and guide wheels, and cyclically pass through the painting mechanism 2, the oven 3, the cooling pool 4 and the cooling box 5 in turn to achieve multi-level surface paint treatment of the wire.

[0042] Specifically, refer to Figure 4 and Figure 5The painting mechanism 2 is arranged on one side of the oven 3, and the painting mechanism 2 includes a paint tank frame 21, a mold frame 22, a painting assembly 23 and a plurality of paint diameter molds 24. The mold frame 22 is fixedly arranged in the paint tank frame 21, and a pressing plate 221 is arranged at one end of the mold frame 22 away from the oven 3. A plurality of wire hole grooves 222 are formed between the pressing plate 221 and the mold frame 22, and the wires are passed through the wire hole grooves 222. The painting assembly 23 is used to paint the wire grooves in the wire hole grooves 222. A plurality of groups of paint diameter molds 24 are arranged and installed at one end of the mold frame 22 away from the pressure plate 221, wherein a paint scraping hole 241 is opened in the paint diameter mold 24, and the paint scraping holes 241 of the plurality of groups of paint diameter molds 24 are flush with and correspond to the wire hole grooves 222, so that after the wire passes through the wire hole grooves 222, it directly passes through the corresponding paint scraping hole 241 of the paint diameter mold 24, and the aperture of the paint scraping hole 241 is slightly larger than the wire diameter of the passed wire, and the portion where the aperture of the paint scraping hole 241 is larger than the wire diameter is the thickness of each layer of surface paint, so that the paint diameter mold 24 scrapes off excess insulating paint coated on the surface of the wire through the paint scraping hole 241, so that each layer of insulating paint coated on the surface of the wire can be kept uniform. Furthermore, the diameters of the paint scraping holes 241 of several groups of paint diameter molds 24 increase evenly, and several groups of paint diameter molds 24 are arranged in sequence on the mold rack 22 according to the diameters of the paint scraping holes 241, so as to ensure that the wire diameter increases evenly with the number of times it passes through the painting mechanism 2.

[0043] Reference Figure 4 In this embodiment, the painting device is provided with three groups of painting mechanisms 2, which are arranged in sequence on one side of the oven 3. The first group of painting mechanisms 2 is used to apply primer to the wire, and the first group of painting mechanisms 2 has 8 groups of paint diameter molds 24; the second group of painting mechanisms 2 is used to apply intermediate paint to the wire, and the second group of painting mechanisms 2 has 4 groups of paint diameter molds 24; the third group of painting mechanisms 2 is used to apply topcoat to the wire, and the third group of painting mechanisms 2 has 2 groups of paint diameter molds 24.

[0044] Reference Figure 4 and Figure 5, the painting component 23 can use the conventional semi-immersion method or spraying method to paint the wire. In this embodiment, the painting component 23 specifically uses the spraying method. Specifically, the painting component 23 includes a paint bucket 231, a paint pump 232 and a preheating pipe 233, wherein the paint bucket 231 is used to store insulating paint, the preheating pipe 233 is arranged between the paint bucket 231 and the paint pump 232, and the paint pump 232 is connected to the paint bucket 231 through the preheating pipe 233. The paint pump 232 is used to extract insulating paint from the paint bucket 231 to spray the wire, and the preheating pipe 233 is used to preheat the insulating paint extracted by the paint pump 232. Specifically, the insulating paint needs to be preheated to 40-80°C to improve the fluidity of the insulating paint and enable it to be better sprayed and cured. In this embodiment, the insulating paint needs to be preheated to 60°C.

[0045] Reference Figure 5 and 6 The paint pump 232 is arranged below the mold frame 22. A paint flow channel 223 is provided inside the mold frame 22 and is interconnected with the wire hole groove 222. The nozzle of the paint pump 232 corresponds to and is connected with the paint flow channel 223, so that the insulating paint sprayed by the paint pump 232 can enter the corresponding wire hole groove 222 along the paint flow channel 223 of the mold frame 22, which can not only achieve full painting of the wire, but also greatly reduce the splashing of insulating paint by the paint pump 232 during spraying, thereby reducing the waste of insulating paint.

[0046] Reference Figure 4 , Figure 5 and Figure 7 After the wire is painted in the wire hole groove 222, it directly passes into the corresponding paint scraping hole 241 of the paint diameter mold 24 and scrapes off the excess insulating paint. Specifically, the paint scraping hole 241 of the paint diameter mold 24 includes an inlet area 2411 and an outlet area 2412, wherein the opening cone angle of the inlet area 2411 is 80°, and the opening cone angle of the outlet area 2412 is set to 20°, so that when the painted wire enters the paint scraping hole 241, the excess insulating paint can be scraped out by the paint diameter mold 24, and quickly flow out of the paint scraping hole 241 along the larger opening cone angle, and then flow into the paint tank frame 21. Further, a return pipe 211 is connected between the bottom of the paint tank frame 21 and the paint bucket 231, and the excess paint flowing into the paint tank frame 21 can be fully returned to the paint bucket 231 through the return pipe 211.

[0047] In order to fully volatilize the solvent in the insulating paint and fully solidify the insulating paint, in this embodiment, the set temperature range of the oven 3 is 400-550°C. Further, since the oven 3 needs to be heated to 400-550°C to fully volatilize the solvent in the insulating paint, the oven 3 can also perform annealing treatment on the wire. Figure 2 and Figure 3 In this embodiment, the unwinding mechanism 1 is arranged on the side of the oven 3 away from the painting mechanism 2, and in the annealing process in step S2, the wire can be guided by the guide mechanism 6, and directly enter the oven 3 for heating and annealing after coming out of the unwinding mechanism 1, and then enter the painting mechanism 2. Therefore, the oven 3 can not only play the role of baking paint, but also anneal the wire, which is conducive to improving the use efficiency of the oven 3. In addition, there is no need to configure an additional annealing furnace, which is conducive to reducing the land occupation requirement of the overall production line equipment on the production site.

[0048] Reference Figure 3 and Figure 4 , the cooling pool 4 and the cooling box 5 are both arranged directly below the oven 3, which is conducive to further reducing the floor space of the production line and optimizing the production line structure. Specifically, the cooling pool 4 is located between the oven 3 and the cooling box 5. After the wire comes out of the oven 3, it first enters the cooling pool 4 and then enters the cooling box 5. The cooling pool 4 and the cooling box 5 are mainly used to fully cool the wire passing through the oven 3. In addition, the cooling pool 4 can also simply clean the wire to remove the impurity powder produced on the surface of the wire due to incomplete drying and roasting. A number of groups of fans 51 are arranged on the top side of the cooling box 5. The air outlet of the fan 51 is directly facing the wire in the cooling box 5. Since the surface of the wire may carry a small amount of moisture after passing through the cooling pool 4, the fan 51 is directly aimed at the wire to discharge air, which can not only dry the wire, but also prevent the residual moisture from causing adverse effects on the subsequent painting, and absorb heat through the evaporation of moisture on the surface of the wire, which is conducive to further cooling the wire.

[0049] S4, Inspection and Roll Collection: Refer to Figure 2 and Figure 3 The inspection mechanism 7 is used to inspect the wire after the paint is cured, and the winding mechanism 8 is used to keep the wire winding tension for winding, so as to obtain the enameled wire with multi-layer surface paint.

[0050] Reference Figure 4 and Figure 8 The inspection mechanism 7 includes a detection tube 71 and a sensor wheel group 72. After the wire comes out of the painting mechanism 2, it first passes through the detection tube 71 and then passes through the sensor wheel group 72. The detection tube 71 is used to inspect whether the wire has bubbles, putty and other raised defects, while the sensor wheel group 72 is used to inspect whether the wire has paint film defects such as missing paint, bare wire, paint film fault, etc., and can alarm for wires with paint film defects.

[0051] Reference Figure 8, a sizing hole 711 is provided inside the detection tube 71, and the aperture size of the sizing hole 711 is the overall wire diameter of the target enameled wire. When a wire with raised defects such as bubbles and putty penetrates the detection tube 71, the outer diameter of the enameled wire is larger than the aperture of the sizing hole 711 of the detection tube 71. At this time, the wire is not easy to pass through the detection tube 71, but under the high-speed traction of the winding mechanism 8, the wire can pass through the detection tube 71, but at the same time, the detection tube 71 will scrape off the raised part of the wire and cause paint film defects, so that the subsequent induction wheel group 72 can sense this and give an alarm in time.

[0052] Reference Figure 8 The induction wheel set 72 includes a metal guide wheel 721, a conductive bracket 722 and an energized sensor 723. The conductive bracket 722 is arranged on both sides of the metal guide wheel 721. The metal guide wheel 721 is mounted on the conductive bracket 722. The two sides of the metal guide wheel 721 are insulated and separated from each other and are connected to the conductive brackets 722 on both sides for electrical conduction. The conductive brackets 722 on both sides are connected to each other for electrical conduction through the energized sensor 723. When the wire with paint film defects bypasses the induction wheel set 72, the wire will connect the two sides of the metal guide wheel 721, and then through the conduction of the conductive bracket 722, the energized sensor 723 will be connected and alarm, so that the unqualified wire with paint film defects can be screened out to achieve the detection effect.

[0053] Reference Figure 2 The winding mechanism 8 can adopt the existing winding device, and in this embodiment, the setting range of the winding tension of the wire is 260-280g.

[0054] The implementation principle of a multi-layer surface paint treatment process for enameled wire in the embodiment of the present application is as follows: Firstly, a suitable bare metal wire is selected as the blank, and the bare metal wire is unwound and stretched through an unwinding mechanism 1 to obtain a wire of target diameter.

[0055] Guided by the guide mechanism 6, the wire material after unwinding and stretching first enters the oven 3 for annealing and softening, and then enters the painting mechanism 2, oven 3, cooling pool 4 and cooling box 5 for the painting and curing process according to production needs.

[0056] Specifically, in the painting mechanism 2, the wire first passes through the wire hole groove 222 on the mold frame 22, and then passes through the corresponding paint scraping hole 241 of the paint diameter mold 24. When the wire passes through the wire hole groove 222, it is sprayed into the paint flow channel 223 by the paint pump 232, and the insulating paint can fully fill the wire hole groove 222 along the paint flow channel 223, so that the insulating paint can be fully attached to the surface of the wire. When the wire passes through the paint scraping hole 241 of the paint diameter mold 24, the paint diameter mold 24 can scrape off the excess insulating paint on the surface of the wire through the paint scraping hole 241, so that each layer of insulating paint coated on the surface of the wire can maintain a uniform thickness. In addition, the excess insulating paint scraped off by the paint diameter mold 24 can fully flow out along the inlet area 2411 of the paint diameter mold 24 and flow into the paint tank frame 21, and then flow back to the paint bucket 231 again through the reflux pipe 211.

[0057] This specific implementation manner is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the specific implementation manner as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A multi-layer surface paint treatment process for enameled wire, characterized in that: The following steps are involved: S1, unwinding and stretching: using the unwinding mechanism (1) to unwind and stretch the pre-prepared bare metal wire to obtain a wire material, and then making the wire material maintain a certain unwinding tension to be pulled into the next process; S2, annealing and softening: heating and annealing the wire in step S1, and then pulling it to the next process; S3, painting and curing: the annealed wire is painted, baked and cooled in sequence by using a painting device, and this is a painting and curing process. Depending on the type of surface paint, multiple painting and curing processes need to be repeated; S4, inspection and winding: using the inspection mechanism (7) to inspect the wire after the paint is cured, and using the winding mechanism (8) to make the wire maintain a certain winding tension for winding, so as to obtain an enameled wire with a multi-layer surface paint; In the S3 paint curing process, the painting device includes a painting mechanism (2), an oven (3), a cooling box (5) and a guiding mechanism (6). After the wire comes out of the previous process, it enters the painting mechanism (2), the oven (3) and the cooling box (5) in sequence. The painting mechanism (2) is arranged on one side of the oven (3). The painting mechanism (2) is used to paint the wire. The oven (3) and the cooling box (5) are used to heat, bake and cool the painted wire respectively. The guiding mechanism (6) is used to guide the wire to circulate through the painting mechanism (2), the oven (3) and the cooling box (5).

2. A multi-layer surface coating treatment process for enameled wire according to claim 1, characterized in that: The painting mechanism (2) comprises a paint tank frame (21), a mold frame (22), a painting assembly (23) and a plurality of groups of paint diameter molds (24); the mold frame (22) is fixedly arranged in the paint tank frame (21); a pressing plate (221) is arranged at one end of the mold frame (22) away from the temperature control mechanism; a plurality of groups of wire hole grooves (222) are formed between the pressing plate (221) and the mold frame (22); and the painting assembly (23) is used to apply insulating paint to the bare metal wires passing through the wire hole grooves (222); A plurality of groups of the paint diameter molds (24) are arranged in a transverse arrangement in sequence and installed on one end of the mold frame (22) away from the pressing plate (221); the paint diameter molds (24) are provided with paint scraping holes (241); the paint scraping holes (241) and the wire hole grooves (222) are aligned with each other and correspond one to one; the diameters of the paint scraping holes (241) of the plurality of groups of the paint diameter molds (24) gradually and evenly increase along the arrangement.

3. A multi-layer surface coating treatment process for enameled wire according to claim 2, characterized in that: The painting assembly (23) comprises a paint bucket (231) and a paint spray pump (232); the paint bucket (231) is located below the paint tank frame (21) and is in communication with the paint tank frame (21); a feed end of the paint spray pump (232) is in communication with the paint bucket (231); a paint flow channel (223) in communication with the wire hole groove (222) is provided inside the mold frame (22); the paint spray pump (232) is arranged directly below the mold frame (22), and a paint spray port of the paint spray pump (232) is in communication with the paint flow channel (223).

4. A multi-layer surface coating treatment process for enameled wire according to claim 3, characterized in that: A preheating pipe (233) is also provided between the paint barrel (231) and the paint spray pump (232), and the preheating pipe (233) is used to preheat the insulating paint to 40-80°C.

5. The multi-layer surface coating treatment process of enameled wire according to claim 2, characterized in that: The paint scraping hole (241) of the paint diameter mold (24) comprises an inlet area (2411) and an outlet area (2412), and the opening cone angle of the inlet area (2411) is 70-85°.

6. The multi-layer surface coating treatment process of enameled wire according to claim 1, characterized in that: The cooling box (5) is arranged directly below the drying oven (3), and a plurality of groups of fans (51) are arranged on the top side of the cooling box (5), and the air outlets of the fans (51) are directly facing the wires in the cooling box (5).

7. A multi-layer surface coating treatment process for enameled wire according to claim 6, characterized in that: A cooling pool (4) is also provided between the oven (3) and the cooling box (5). The cooling pool (4) is located directly below the oven (3). The wire is guided by the guide mechanism (6) and after coming out of the oven (3), it first enters the cooling pool (4) and then enters the cooling box (5).

8. The multi-layer surface coating treatment process of enameled wire according to claim 1, characterized in that: The unwinding mechanism (1) is arranged on a side of the oven (3) away from the painting mechanism (2). In the S2 annealing process, the wire is guided by the guiding mechanism (6), and after coming out of the unwinding mechanism (1), enters the oven (3) for annealing, and then enters the painting mechanism (2).

9. The multi-layer surface coating treatment process of enameled wire according to claim 1, characterized in that: In the S4 inspection and winding process, the inspection mechanism (7) comprises a detection tube (71) and a sensing wheel group (72), wherein the detection tube (71) is used to inspect whether the wire has convex defects such as bubbles and putty, and the sensing wheel group (72) is used to inspect whether the wire has paint film defects such as missing coating, bare wire, paint film fault, etc., and can alarm for wires with paint film defects; A sizing hole (711) is provided inside the detection tube (71), and the diameter of the sizing hole (711) is equal to the overall wire diameter of the target enameled wire.

10. The multi-layer surface coating treatment process of enameled wire according to claim 9, characterized in that: The induction wheel group (72) comprises a metal guide wheel (721), a conductive bracket (722) and a powered inductor (723); the conductive bracket (722) is arranged on both sides of the metal guide wheel (721); the two sides of the metal guide wheel (721) are insulated and separated from each other, and are respectively connected to the conductive brackets (722) on both sides for electrical conduction; the conductive brackets (722) on both sides are connected to each other for electrical conduction through the powered inductor (723).

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