Automobile motor rotor electrostatic powdering all-in-one machine and machining method thereof

Abstract

The invention discloses an automobile motor rotor electrostatic powdering all-in-one machine and a machining method thereof. The electrostatic powdering all-in-one machine is composed of a high-temperature oil removal mechanism, a material taking manipulator assembly, a cooling channel, an electrostatic powdering fluidized bed, a powder scraping mechanism, a powder suction mechanism, a high-frequency heating curing mechanism, a cooling mechanism, a dust suction cabinet, a cyclone separation tower, a powder supply box, upper-layer double screws and lower-layer double screws. The machining method comprises the following steps: (1) cleaning and mounting a rotor workpiece; (2) discharging; (3) high-frequency oil removal; (4) blanking and cooling; (5) electrostatic powdering; (6) scraping powder by a rotor; (7) sucking powder by a rotor; (8) high-frequency heating and curing; (9) cooling detection; and (10) secondary heating and curing. The double-layer raceway structural design is adopted, and the occupied area of equipment is reduced; after the powder scraping sheet structure is adopted, material shortage and non-uniform thickness in the rotor chip of the automobile motor are avoided. And the problem of poor powdering quality in the chip groove is avoided, and the recovery rate of the insulating powder is improved by 5.6%.

Description

Technical Field

[0001] The invention relates to the technical field of motor manufacturing, processing and assembly, and in particular to an electrostatic powder coating integrated machine for automobile motor rotors and a processing method thereof. Background Art

[0002] The rotor insulation layer of the motor of the automotive power management system, such as the throttle motor, and the motor of the automotive brake management system, such as the electronic parking brake motor, is prepared by applying powder and heating and curing the rotor insulation layer using the electrostatic fluidized bed method. The existing methods and technical materials also have technologies similar to those of patent applications. Most of them introduce the operation and simple recovery of powder on the electrostatic fluidized bed, but few people have proposed an all-in-one machine for high-frequency oil removal of the rotor workpiece (the workpiece is the automotive motor rotor), powder on the electrostatic fluidized bed, scraping the workpiece surface, high-frequency heating and curing, and cooling the workpiece. Similar electrostatic powdering machines were manufactured in the early days, but after high-frequency oil removal, the single-layer screw rolled. In order to ensure the cooling time, a longer rolling track was required, which made the all-in-one machine longer and occupied more area. The scraping powder is easy to scrape off the insulation powder in the workpiece, i.e., the automotive motor rotor chip, which leads to pores and shrinkage after curing, lack of material and uneven thickness, resulting in low rotor dielectric strength, leakage, and low insulation resistance. On the one hand, the existing technology requires manual supplementation of insulation powder, and cannot effectively monitor the liquid level of insulation powder. The old-fashioned electron tube is large in size and takes a long preheating time. Early electrostatic generators did not have an arc protection design, and were prone to catching fire despite being grounded. The electrostatic net is placed under the fluidized bed porous plate. The negative charge of the static electricity decays in the air, and the static voltage needs to be increased to ensure the adsorption strength. At the same time, the arc light generated by the strong ionization of the discharge net close to the porous plate can easily burn the porous plate and catch fire, which is not energy-saving and has a fire hazard. On the other hand, the traditional single air intake airflow has the problem of insulation powder accumulation and uneven thickness in the fluidized bed powder bed. The scraping powder in the electrostatic powdering area and the scraping powder recovery in the high-frequency heating curing area both enter the recovery pipeline, which is prone to produce impurities and has a low insulation powder recovery rate. The old high-frequency machine in the high-frequency heating curing area has no overheating and no water default, no overcurrent, no overpressure, and no pressure shortage alarm device. Summary of the invention

[0003] The purpose of the present invention is to provide an integrated electrostatic powder coating machine for automobile motor rotors and a processing method thereof.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] An integrated electrostatic powder coating machine for automobile motor rotors, comprising a high-temperature oil removal mechanism, a material taking manipulator assembly, a cooling channel, an electrostatic powder coating fluidized bed, a powder scraping mechanism, a powder suction mechanism, a high-frequency heating and curing mechanism, a cooling mechanism, a dust suction cabinet 1, a dust suction cabinet 2, a cyclone separation tower, a powder supply box, an upper twin screw and a lower twin screw. The upper twin screw passes under the high-temperature oil removal mechanism, and a discharge screw position is left at the feeding end of the high-temperature oil removal mechanism. The material taking manipulator assembly is installed at the discharge side of the high-temperature oil removal mechanism and the end of the upper twin screw. The lower twin screw is installed below the upper twin screw, and the thread rotation direction of the lower twin screw is opposite to that of the upper twin screw. The cooling channel, the electrostatic powder coating fluidized bed, the powder scraping mechanism, the powder suction mechanism, the high-frequency heating and curing mechanism, the cooling mechanism, the dust suction cabinet 1, the dust suction cabinet 2, the cyclone separation tower, the powder supply box, the upper twin screw and the lower twin screw are arranged. The heat curing mechanism and the cooling mechanism are arranged in sequence along the feeding direction of the lower twin-screw; the powder scraping mechanism and the bottom of the electrostatic powder-coating fluidized bed are connected to the pipeline of the cyclone separation tower; the other end of the cyclone separation tower is connected to the inlet pipe of the second dust collection cabinet; the outlet pipe of the second dust collection cabinet is connected to the on-site sewage treatment pipeline for discharge; the inlet pipe of the first dust collection cabinet is connected to the bottom pipeline of the high-frequency heating curing mechanism; the outlet pipe of the first dust collection cabinet is connected to the on-site sewage treatment pipeline; the powder supply box is installed at the bottom of the cyclone separation tower; the powder supply box supplies powder to the electrostatic powder-coating fluidized bed through a vacuum suction device; the two ends of the rotor workpiece are respectively inserted into the left powder coating tooling and the right powder coating tooling, and are fixed by inserting the elastic plug into the connecting port; the installed rotor workpiece is placed in the screw groove of the upper twin screw at the discharge screw position for feeding.

[0006] Furthermore, side guard bars are provided on both sides of the upper twin screw and the lower twin screw, and when the rotor workpiece is placed on the twin screw, it forms an angle of 80°±3° with the side guard bars; evenly distributed bearing brackets are provided at the bottom of the upper twin screw and the lower twin screw, and the bearing brackets are composed of a support seat and a bearing.

[0007] Furthermore, the high-temperature oil removal mechanism includes a high-frequency heating tube and a smoke collection hood arranged above the upper twin screw.

[0008] Furthermore, the material picking robot assembly includes a linear motor, a finger cylinder, a linear guide and a horizontal cylinder. The linear motor is installed on the linear guide, the horizontal cylinder drives the linear motor to move horizontally along the linear guide, and the finger cylinder is installed on the linear motor, which drives the finger cylinder to move up and down.

[0009] Furthermore, the electrostatic powdering fluidized bed includes a powder feed pipe, a powder feed outlet, an electrostatic net, a porous plate, an upward pipe, a lower chamber, an external powder box and a vibrator installed in the fluidized bed body, the powder feed pipe is connected to the powder supply box, the feed pipe is arranged on the top of the fluidized bed body, the lower twin screw passes through the fluidized bed body, the porous plate divides the interior of the fluidized bed into two upper and lower chambers, the lower twin screw is located in the lower chamber, the upward pipe is installed in the lower chamber, the electrostatic net is arranged between the porous plate and the lower twin screw, the powder feed outlet is arranged at the upper end of the upper chamber, the powder feed outlet is connected to the external powder box at the bottom of the fluidized bed, and the vibrator is installed at the bottom of the lower chamber.

[0010] Furthermore, the powder scraping mechanism includes a height adjustment component and a plurality of powder scraping blades installed on the height adjustment component, the height adjustment component includes a powder scraping component and a rotating screw, the rotating screw is threadedly connected to the powder scraping component, the powder scraping blade is installed on the powder scraping component, the powder scraping blade is set at a certain inclination angle in the vertical direction and the horizontal direction, a duckbill air blowing nozzle is installed on each side of the powder scraping blade, and the duckbill air blowing nozzle is connected to the air pump; the powder suction mechanism includes a joint, a vacuum generator, an adjusting part and a powder suction head, the vacuum generator is installed on the adjusting part, the powder suction head is installed on the vacuum generator, and the vacuum generator is directly connected to the powder supply box through a joint and a vacuum powder suction pipe.

[0011] Furthermore, the high-frequency heating and curing mechanism includes a high-frequency heating water-cooled copper tube and a plurality of capillary blowing tubes, and the plurality of capillary blowing tubes are distributed at both ends of the rotor workpiece.

[0012] Furthermore, the cooling mechanism includes an isolation cover and a plurality of small heat dissipation fans, wherein the isolation cover is installed above the lower layer of twin screws, and the small heat dissipation fans are installed below the lower layer of twin screws.

[0013] Furthermore, the side guard bars, the upper twin screws, and the different processing areas of the lower twin screws are all made of a variety of materials.

[0014] A method for electrostatic powder coating of automobile motor rotors, comprising the following steps:

[0015] (I) Cleaning and installation of rotor workpiece: After the rotor workpiece is cleaned by ultrasonic cleaning, the two ends are covered with powder-coated tooling, and the elastic plug is inserted into the connection port for fixing. The pull-out force after clamping is controlled to be about 20N;

[0016] (ii) Discharging: Place the rotor workpiece installed on the powder coating tooling onto the upper twin screw at the discharging screw position, and the upper twin screw will send the rotor workpiece into the high-frequency degreasing area for degreasing;

[0017] (III) High-frequency oil removal: The rotor workpiece enters the high-frequency oil removal zone and is heated by electromagnetic induction of the high-frequency heating tube. The continuous heating allows the oil in the chip slot gap of the rotor workpiece to evaporate, and the volatile oil fume inside is extracted by the fume hood for centralized treatment;

[0018] (IV) Unloading cooling: The rotor workpiece is transferred to the lower twin screw by the material taking manipulator assembly for reverse transportation, and cooled through the ventilation cooling channel. The small heat dissipation fan in the cooling channel is aimed at the workpiece to blow air for cooling, and the rotor workpiece is cooled to 35℃±2℃;

[0019] (V) Electrostatic powdering: After cooling, the rotor workpiece is continuously transported by the lower twin screw into the electrostatic powdering fluidized bed. While the lower twin screw is transporting forward, the rotor workpiece rotates to be electrostatically powdered. Excess powder enters the cyclone separation tower through the external powder box and pipeline, and then enters the powder supply box for recycling after being processed by the cyclone separation tower.

[0020] (VI) Rotor powder scraping: The powdered rotor workpiece is sent to the powder scraping area of ​​the powder scraping mechanism through the lower twin screw. The position of the powder scraping blade is adjusted in advance by the handle to ensure the pressure and elasticity of the powder scraping blade in contact with the rotor workpiece. The powder scraping blade scrapes the outer surface of the rotor workpiece. When the two axial ends of the rotor workpiece pass through the duckbill blowing nozzle position, the duckbill blowing nozzle blows off the insulating powder on the two axial ends of the rotor; the excess powder enters the cyclone separation tower through the external powder box and the pipeline, and then enters the powder supply box after being processed by the cyclone separation tower and recycled again;

[0021] (VII) Rotor powder suction: After the rotor powder is scraped off, the powder enters the rotor powder suction mechanism for vacuum powder suction. The vacuum generator and the powder suction head directly send the powder at the rotor workpiece powder suction part into the powder supply box for recycling;

[0022] (VIII) High-frequency heating curing: After the rotor absorbs the powder, it is sent to the high-frequency heating curing zone through the lower twin screw for high-temperature curing. The surface of the rotor workpiece is heated to 25±3°C higher than the melting temperature of the powder, and the powder covering the surface of the rotor workpiece and the chip slot is melted and leveled; at the same time, when the rotor workpiece passes the position of the capillary blowing pipe, the capillary blowing pipe blows and removes the powder at the positions at both ends of the rotor workpiece that do not need to be powdered; the blown-off powder is sucked into the pipeline through the dust collection cabinet for post-processing and then connected to the on-site sewage treatment pipeline from the dust collection cabinet outlet pipe. The powder sucked in the high-frequency heating curing zone is no longer recycled after being processed by the dust collection cabinet, and is discharged after entering the sewage treatment pipeline;

[0023] (IX) Cooling inspection: After high-frequency heating and curing, the rotor workpiece is sent to the cooling mechanism through the lower twin screw for cooling until the surface temperature is 35±2°C. The rotor workpiece is removed and placed under a magnifying glass to inspect for bubbles, missing materials, and defects. After the inspection is completed, the powder coating tooling is removed by an automatic disassembly machine, and the insulating powder on the powder coating tooling is cleaned and recycled;

[0024] (10) Secondary heating and curing: Place the rotor workpiece in an oven, adjust the heating temperature, and maintain it for a certain period of time for secondary heating and curing so that it meets the designed bonding strength and electrical strength. After cooling and passing the inspection, the rotor workpiece is transferred to the subsequent winding and other processing steps.

[0025] In summary, the present invention has the following beneficial effects:

[0026] 1. High-frequency oil removal adopts a double-layer raceway structure. The upper track is high-frequency oil removal, and the lower track is cooled, which reduces the footprint of the integrated machine. The machine is grabbed by a manipulator and enters the lower cold track. The total length of the integrated machine for high-frequency oil removal, electrostatic fluidization bed powdering, rotor workpiece surface powder scraping, high-frequency heating and curing, and rotor workpiece cooling is shortened from the original 9.8m to 6.9m, a total length reduction of 29.59%, and the width design of 2.2±0.1m remains unchanged.

[0027] 2. After adopting the powder scraping structure designed by the present invention, the lack of material and uneven thickness in the rotor chip of the automobile motor are eliminated. The recovery rate of insulating powder is increased by 5.6%; the electrostatic net is directly buried in the fluidized bed powder bed, in direct contact with the insulating powder, and the high-voltage charge is not attenuated, eliminating the potential safety hazard of fire; before the improvement, the static voltage is set at (-75KV to -100KV), and after the improvement, the static voltage is set at (-35KV to -45KV), reducing energy consumption.

[0028] 3. Use double air inlet channels to raise powder gas and add fluidized bed vibration device to prevent the accumulation and uneven thickness of insulating powder in the fluidized powder bed; the air pressure control uses SMC's electrical proportional valve to control the air pressure of the electrostatic powder box, powder supply box, and powder extraction.

[0029] 4. The scraper blades of the scraper mechanism are designed with 0.188±0.02mmmm PET (mylar) material, and every 2 blades form a pair, with a total of 46±2 pairs installed. The scraper mechanism adjusts the pressure and elastic force of the contact between the scraper blade and the workpiece, and adjusts the vertical and horizontal inclination angles of the scraper blade to ensure that the scraper blade only scrapes the powder on the outer surface of the rotor chip, and does not touch the insulating powder in the chip slot of the rotor workpiece, thereby eliminating the problem of poor powder quality in the chip slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the electrostatic powder coating integrated machine for automobile motor rotors of the present invention;

[0031] Figure 2 It is a top view of the electrostatic powder coating machine for automobile motor rotors of the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of the rotor workpiece to be powder coated;

[0033] Figure 4 It is a schematic diagram of the structure in which the rotor workpiece is installed on the powder coating tooling;

[0034] Figure 5 It is a schematic diagram of the twin-screw conveying structure;

[0035] Figure 6 It is a structural schematic diagram of the high temperature oil removal mechanism;

[0036] Figure 7 It is a structural diagram of the assembly part of the reclaiming manipulator;

[0037] Figure 8 It is a schematic diagram of the structure of the electrostatic powder coating and circulation system;

[0038] Fig. 9 This is a structural diagram of the electrostatic powder coating and circulation system from another angle;

[0039] Fig.10 This is a schematic diagram of the internal structure of the electrostatic powdering fluidized bed;

[0040] Fig.11 It is a structural schematic diagram of the powder scraping mechanism;

[0041] Fig.12 This is a schematic diagram of the installation angle of the scraper;

[0042] Fig.13 This is a schematic diagram of the powder blowing and powder suction parts of the rotor workpiece;

[0043] Fig.14 It is a structural schematic diagram of the powder suction mechanism;

[0044] Fig.15 It is a schematic diagram of the partial structure of the high-frequency heating curing mechanism;

[0045] Fig.16 It is a schematic diagram of the structure of the capillary blowing tube;

[0046] Fig.17 It is a structural diagram of the cooling mechanism part.

[0047] In the figure, 1. feeding screw position; 2. high temperature oil removal mechanism; 3. material taking manipulator assembly; 4. cooling channel; 5. electrostatic powdering fluidized bed; 6. powder scraping mechanism; 7. high frequency heating curing mechanism; 8. cooling mechanism; 9. dust collection cabinet 1; 10. dust collection cabinet 2; 11. cyclone separation tower; 14. powder suction mechanism; 15. powder supply box; 16. rotor workpiece; 17. left powder coating tooling; 18. right powder coating tooling; 19. elastic plug; 20. upper twin screw; 201. bearing; 202. bearing seat; 21. side guard bar; 23. high frequency heating tube; 26. linear motor; 27. finger cylinder; 28. linear guide; 29. ​​horizontal cylinder; 30. lower twin screw; 31. smoke collection hood; 32. electrostatic generator; 33. fluidized bed base; 34. fluidized bed cover; 35. Powder collecting funnel; 36, duckbill air blowing nozzle; 37, powder scraping piece; 38, vacuum powder suction tube; 39, vacuum pipeline; 40, height adjustment component; 41, regulating valve 1; 42, connecting pipe; 44, powder delivery pipeline; 45, powder supply valve; 47, recovery pipe; 48, copper strip; 49, copper block; 50, regulating valve 2; 51, powder inlet pipeline; 52, pouring outlet; 54, electrostatic net; 55, porous plate; 56, rising pipeline; 57, lower chamber; 58, outer powder box; 59, vibrator; 60, fluidized bed box; 63, powder scraping component; 641, powder blowing part; 642, powder suction part; 66, joint; 67, vacuum generator; 68, adjusting piece; 69, powder suction head; 70, high-frequency heating water-cooled copper tube; 71, capillary air blowing pipe; 72, isolation cover; 73, small heat dissipation fan. DETAILED DESCRIPTION

[0048] The present invention is further described in detail below in conjunction with the accompanying drawings, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] An electrostatic powder coating machine for automobile motor rotors, such as Figure 1 and Figure 2As shown, it consists of a high-temperature oil removal mechanism 2, a material taking manipulator assembly 3, a cooling channel 4, an electrostatic powder feeding fluidized bed 5, a powder scraping mechanism 6, a powder suction mechanism, a high-frequency heating curing mechanism 7, a cooling mechanism 8, a dust suction cabinet 1 9 and a dust suction cabinet 2 10, a cyclone separation tower 11, a powder supply box 15, an upper twin screw 20 and a lower twin screw 30. The upper twin screw 20 passes under the high-temperature oil removal mechanism 2, and the upper twin screw 20 leaves a discharge screw position 1 at the feeding end of the high-temperature oil removal mechanism 2. The material taking manipulator assembly 3 is installed on the discharge side of the high-temperature oil removal mechanism 2 and the end of the upper twin screw 20. The lower twin screw 30 is installed below the upper twin screw 20, and the lower twin screw 30 and the upper twin screw 20 are connected. The threads are arranged in opposite directions, and the cooling channel 4, electrostatic powder-coating fluidized bed 5, powder scraping mechanism 6, powder suction mechanism, high-frequency heating and curing mechanism 7 and cooling mechanism 8 are arranged in sequence along the feeding direction of the lower twin screw 30. The powder scraping mechanism 6 and the bottom of the electrostatic powder-coating fluidized bed 5 are connected to the cyclone separation tower 11. One end of the cyclone separation tower is connected to the inlet pipe of the dust collection cabinet 10, and the outlet pipe of the dust collection cabinet 10 is connected to the on-site sewage treatment pipeline for discharge. The dust collection cabinet 19 is connected to the inlet pipe of the bottom pipe of the high-frequency heating and curing mechanism 7, and the outlet pipe of the dust collection cabinet 19 is connected to the on-site sewage treatment pipeline. The powder supply box 15 is installed at the bottom of the cyclone separation tower 11, and the powder supply box 15 supplies powder to the electrostatic powder-coating fluidized bed 5 through a vacuum suction device.

[0050] Specifically, Figure 3 As shown, it is a schematic diagram of the structure of the rotor workpiece 16, and the insulating powder is evenly coated on the shaft of the rotor workpiece 16 and in the chip slot. The thickness of the chip slot is H, where the coating length is L, A and B are the lengths of the two axial ends of the rotor workpiece, and no insulating powder layer is allowed at positions A and B.

[0051] Specifically, Figure 4 As shown, the two ends of the rotor workpiece 16 are respectively inserted into the left powder coating tool 17 and the right powder coating tool 18, and are fixed by inserting the elastic plug 19 into the connection port. The main body of the powder coating tool is made of brass, and the elastic plug 19 is made of non-metallic wear-resistant material. The pull-out force after clamping is controlled to be about 20N, ensuring that the clamp does not loosen during use, and can ensure the stability of the powder coating size L, while preventing the rotor workpiece shaft core from being scratched during the rotation and forward process. The rotor workpiece 16 is conductive with the left powder coating tool 17 and the right powder coating tool 18, and the potential with the grounded copper rod is 0, which is the positive pole in the powder on the electrostatic powder fluidized bed. Finally, after the rotor workpiece and the powder coating tool are installed, they are placed in the screw groove of the upper double screw 20 of the discharge screw position 1 for feeding.

[0052] Further, such as Figure 5As shown, side guard bars 21 are provided on both sides of the upper twin screw 20 and the lower twin screw 30, and the rotor workpiece 16 forms an angle of 80°±3° with the side guard bars 21 when placed on the twin screws; evenly distributed bearing brackets are provided at the bottom of the upper twin screw 20 and the lower twin screw 30, and the bearing brackets are composed of a support seat 201 and a bearing 202, which are connected by pins.

[0053] Further, such as Figure 6 As shown, the high-temperature oil removal mechanism 2 includes a high-frequency heating tube 23 and a smoke collecting hood 31 arranged above the upper twin screw 20. When the rotor workpiece 16 runs to this point, it is heated by the high-frequency heating tube 23, and the continuous heating allows the oil in the chip slot gap of the rotor workpiece 16 to evaporate. This section of the upper twin screw 20 is made of thermosetting insulating material; cooling water circulates in the high-frequency heating tube, and the volatilized oil smoke in the rotor workpiece 16 is extracted by the smoke collecting hood 31 for centralized treatment. The side baffle 21 in this area is made of bakelite material.

[0054] Further, such as Figure 7 As shown, the material taking robot assembly 3 includes a linear motor 26, a finger cylinder 27, a linear guide 28 and a horizontal cylinder 29, wherein the linear motor 26 is mounted on the linear guide 28, and the horizontal cylinder 29 pushes the linear motor 26 to move horizontally along the linear guide 28, and the finger cylinder 27 is mounted on the linear motor 26, and the linear motor 26 drives the finger cylinder 27 to move up and down, and moves the rotor workpiece 16 on the upper twin screw 20 (left-handed) to the lower twin screw 30 (right-handed) below; then the rotor workpiece 16 is sent into the cooling channel 4 through the lower twin screw 30, and 12±2 small heat dissipation fans 73 are evenly distributed through the channel to blow air to the surface of the rotor workpiece 16 for strong cooling, and the channel length is Q=2200±15mm, which can cool the rotor workpiece 16 to 35℃±2℃, which is convenient for subsequent electrostatic powdering, and the side baffle 21 in this area is made of S304 material; the lower twin screw here is made of alloy steel.

[0055] Further, such as Figure 8 , 9 As shown in 10, after the rotor workpiece is cooled, it enters the electrostatic powdering and powder circulation system, which consists of a cyclone separation tower 11, a powder supply box 15, an electrostatic powdering fluidized bed 5 and pipeline valves. The electrostatic generator of the electrostatic powdering fluidized bed 5 adopts a SIMCO American electrostatic generator, and the air pressure control adopts an SMC electrical proportional valve to control the air pressure of the electrostatic powder box, the powder supply box, and the powder extraction; the electrostatic powder box, the powder supply box, and the powder extraction air pressure are set on the touch screen, and the above air pressures are monitored for precise control.

[0056] Specifically, the cyclone tower separator 11 and the connecting pipe 42 are connected to the dust collecting cabinet 2 10 to provide vacuum suction for the cyclone tower. The regulating valve 1 41 and the regulating valve 2 50 are pipeline vacuum suction regulating valves for adjusting the vacuum suction of the vacuum pipeline 39 and the recovery pipe 47. The powder supply box 15 has a vacuum pump to automatically and continuously supply powder to the powder feeding pipe 44 to the electrostatic powder feeding fluidized bed. Fig.10 As shown, the electrostatic powder-coating fluidized bed 5 includes a powder feed pipe 51, a powder feed outlet 52, an electrostatic net 54, a porous plate 55, an upward pipe 56, a lower chamber 57, an external powder box 58 and a vibrator 59 installed in a fluidized bed body 60. The powder feed pipe 51 is connected to the powder supply box 46, and the feed pipe 51 is arranged at the top of the fluidized bed body 60. The lower twin screw 30 is arranged through the fluidized bed body 60. The porous plate 55 divides the interior of the fluidized bed into two upper and lower chambers. The lower twin screw 30 is located in the lower chamber 57, and the upward pipe 56 is installed in the lower chamber 57. The electrostatic net 54 is arranged between the porous plate 55 and the lower twin screw 30. The powder feed outlet 52 is arranged at the upper end of the upper chamber, and the powder feed outlet 52 is connected to the external powder box 58 at the bottom of the fluidized bed. The vibrator 59 is installed at the bottom of the lower chamber 57.

[0057] Specifically, the lower side of the upward pipe 56 is evenly perforated with φ5mm±0.5 and a spacing of 30±1.5mm. The two ends are fed with dried compressed air. The compressed air is evenly filled with the lower chamber 57 through the small holes on the upward pipe, and enters the upper chamber through the pores of the porous plate 55. The upper chamber has powder entering from the powder supply box 15, the powder delivery pipe 44 and the powder inlet pipe 51 through the vacuum pump. There is a certain air pressure gas under the lower porous plate 55, which blows the powder up and passes through the electrostatic net 54. The electrostatic net 54 is directly buried in the fluidized powder bed after improvement. The charge is not attenuated and directly contacts the powder with negative charge. The static voltage is set at (-35KV to -45KV) to reduce energy consumption. By adjusting the air pressure in the upward pipe 56, the height of the powder in the upper chamber can be adjusted. The excess powder can escape into the outer powder box 58 and be recovered to the cyclone tower 11 through the recovery pipe 47. The powder supply 45 is opened by setting the time, and the insulating powder returns to the powder supply box 15. This ensures that the height of the powder raising surface in the fluidized bed is always constant. The rotor workpiece 16 passes through the fluidized bed. Because the contact potential of the rotor workpiece 16 through the left powder coating tool 17, the right powder coating tool 18 and the grounded copper bar 48 and the copper block 49 is 0, the negatively charged insulating powder is adsorbed onto the rotor workpiece 16 and the surface of the left powder coating tool 17 and the right powder coating tool 18, thereby completing the insulating powder coating. The side baffle 21 in this area is made of brass rods. By adding a vibrator 59 at the bottom of the fluidized bed, by controlling the vibration amplitude and frequency, that is, controlling the vibration intensity, it is convenient to improve the flow quality of the insulating powder in the fluidized bed, avoid insulating powder accumulation, and easily form a stable and uniform powder raising scene. The speed of the twin screw rotation is one of the conditions to ensure the thickness of the insulating powder after powder coating and curing. The main shaft speed is controlled by the inverter, the working speed is stable and reliable, and it has an abnormal alarm. The PLC immediately stops the relevant equipment after receiving the alarm signal; and the sound and light alarm, the touch screen prompts abnormal information; to eliminate the Faraday effect, the fluidized bed insulating powder forms two powder raising levels. The rotor workpiece is set at a fixed distance from the dynamic liquid surface formed by the fluidized bed. At the same time, in order to ensure the powder coating in the chip slot cavity of the rotor workpiece, a certain powder raising scene needs to be formed. The air pressure controls the air pressure of the electrostatic powder box, powder supply box, and powder extraction by using SMC's electrical proportional valve; at the same time, the time the rotor workpiece is in the powder zone of the electrostatic fluidized bed is set by the PLC under the control of the twin screw speed by the inverter, and the working speed can be set by itself. The thickness of high-frequency heating curing after powder coating can be controlled by adjusting the electrostatic voltage and powder coating time; the twin screw here is a thermosetting insulating material.

[0058] Further, such as Fig.11As shown, the powder scraping mechanism 6 includes a height adjustment component 40 and a plurality of powder scraping blades 37 installed on the height adjustment component 40, the powder scraping blades 37 are made of 0.188±0.02mmmm PET (mylar) material, the height adjustment component 40 includes a powder scraping component 63 and a rotating screw, the rotating screw is threadedly connected to the powder scraping component 63, the powder scraping blade 37 is installed on the powder scraping component 63, and the powder scraping blade 37 is set at a certain inclination angle in both the vertical direction and the horizontal direction. For details, refer to Fig.12 As shown, every 2 pieces form a pair, and a total of 46±2 pairs are installed. The pressure and elastic force of the scraper blade in contact with the workpiece are adjusted by the powder scraping mechanism. The scraper blade is inclined at A°±2° in the vertical direction and B°±2° in the horizontal direction. For rotor workpieces with an outer diameter of φ30mm, the scraper blade is inclined at 10±2° in the vertical direction and 12±2° in the horizontal direction. The larger the outer diameter of the rotor workpiece, the larger the installation angles A° and B° of the scraper blade. The lower twin screw rotates right, and the workpiece rotates right and moves forward continuously, so the scraper blade 37 will only scrape the powder on the outer surface of the rotor chip, and will not touch the insulating powder in the chip slot of the rotor workpiece, thereby eliminating the problem of poor powder quality in the chip slot. A duckbill air nozzle 36 is installed on each side of the scraper blade 37, and the duckbill air nozzle 36 is connected to the air pump.

[0059] like Fig.13 and Fig.14 As shown, the powder suction mechanism includes a joint 66, a vacuum generator 67, an adjustment member 68 and a powder suction head 69. The vacuum generator 67 is installed on the adjustment member 68, and the powder suction head 69 is installed on the vacuum generator 67. The vacuum generator 67 is directly connected to the powder supply box 15 through the joint 66 and the vacuum powder suction pipe 38. The powder suction part 642 of the rotor workpiece sucks powder through the powder suction mechanism, and the powder blowing part 641 blows powder through the duckbill blowing nozzle 36 in the powder scraping mechanism 6. The blown powder enters the cyclone separation tower 11 for treatment and then enters the powder supply box 15 for reuse. The powder blowing part 642 uses powder suction because it is close to the area where the rotor workpiece needs to be powdered. The insulating powder is not cured by high-frequency heating and is easy to blow off, resulting in a lack of material in the rotor workpiece, pores and other defects. The time the rotor workpiece is in the powder scraping area is set by the PLC under the control of the inverter through the twin screw speed, and the working speed can be set by itself; here the twin screw is a thermosetting insulating material, and the side baffle 21 is a bakelite material.

[0060] Further, such as Fig.15 and Fig.16As shown, the high-frequency heating curing mechanism 7 includes a high-frequency heating water-cooled copper tube 70 and a plurality of capillary blowing tubes 71. The water-cooled copper tube 70 of the high-frequency heating machine is combined. When the rotor workpiece 16 passes through, the rotor surface can be heated to a set temperature due to electromagnetic induction heating. The temperature of the rotor workpiece surface is set to be higher than the melting temperature of the insulating powder by 25±3°C. At this temperature, the insulating powder in the covered rotor slot and the powder on the rotor shaft core will melt and flow, and evenly cover the rotor workpiece surface and the rotor workpiece chip slot. Multiple capillary blowing tubes 71 are distributed at both ends of the rotor workpiece, and the powder blowing part 641 and the powder suction part 642 of the rotor workpiece that do not need to be coated with insulating powder are blown to remove powder, and the second powder removal is performed to remove the excess insulating powder of the rotor tooling. The removed powder here is sucked in by the dust cabinet-9 inlet pipe for treatment, and then discharged by the dust cabinet-9 outlet pipe connected to the on-site sewage treatment pipeline, and is no longer reused. When the rotor workpiece enters the high-frequency heating curing area, it actually still undergoes the rotor workpiece preheating, the initial melting of the insulating powder, the complete melting and leveling, and the initial curing stage. It is necessary to set the rotor workpiece for the second time to blow off the powder. When the rotor workpiece is completely solidified, the rotor workpiece does not need to be powdered (refer to Figure 4 and Fig.13 ) have been blown to remove powder. At the same time, the time of the rotor workpiece in the high-frequency heating and curing zone is set by the PLC under the control of the inverter of the lower twin screw. The working speed can be set by itself. The side baffle 21 in this area is made of bakelite material; the lower twin screw 30 here is made of thermosetting insulating material.

[0061] Further, such as Fig.17 As shown, the cooling mechanism 8 includes an isolation cover 72 and 8±1 small cooling fans 73. The isolation cover 72 is installed above the lower twin screw 30, and the small cooling fans 73 are installed below the lower twin screw 30. When the rotor workpiece passes through, 8±1 small cooling fans are evenly distributed in the cooling zone channel to blow air toward the surface of the rotor workpiece for strong cooling. The temperature of the rotor workpiece will gradually cool down to a surface temperature of 35±2°C. The rotor workpiece obtains a design control thickness H of the insulating powder layer (reference Figure 3 ), check for bubbles, lack of materials and defects under a magnifying glass. At this time, the operator or the automatic disassembly machine for powder coating tooling removes the left powder coating tooling 17 and the right powder coating tooling 18 on the rotor workpiece. The powder coating tooling needs to be cleaned up in the cleaning room after the scattered insulating powder is cleaned up for reuse. There will be an exhaust pipe above the isolation cover to discharge the hot air to the outside. The side baffle 21 in this area is made of S304 material, and the lower twin screw 30 here is made of alloy steel. At this time, the rotor workpiece, i.e. the automobile motor rotor, is degreased by high frequency, powdered on the electrostatic fluidization bed, powdered in the powder scraping area, and cured by high frequency heating and passed through the cooling area to complete the electrostatic powdering.

[0062] A method for electrostatic powder coating of automobile motor rotors, comprising the following steps:

[0063] (I) Cleaning and installation of rotor workpiece: After the rotor workpiece is cleaned by ultrasonic cleaning, the two ends are covered with powder-coated tooling, and the elastic plug is inserted into the connection port for fixing. The pull-out force after clamping is controlled to be about 20N;

[0064] (ii) Discharging: Place the rotor workpiece installed on the powder coating tooling onto the upper twin screw at the discharging screw position, and the upper twin screw will send the rotor workpiece into the high-frequency degreasing area for degreasing;

[0065] (III) High-frequency oil removal: The rotor workpiece enters the high-frequency oil removal zone and is heated by electromagnetic induction of the high-frequency heating tube. The continuous heating allows the oil in the chip slot gap of the rotor workpiece to evaporate, and the volatile oil fume inside is extracted by the fume hood for centralized treatment;

[0066] (IV) Unloading cooling: The rotor workpiece is transferred to the lower twin screw by the material taking manipulator assembly for reverse transportation, and cooled through the ventilation cooling channel. The small heat dissipation fan in the cooling channel is aimed at the workpiece to blow air for cooling, and the rotor workpiece is cooled to 35℃±2℃;

[0067] (V) Electrostatic powdering: After cooling, the rotor workpiece is continuously transported by the lower twin screw into the electrostatic powdering fluidized bed. While the lower twin screw is transporting forward, the rotor workpiece rotates to be electrostatically powdered. Excess powder enters the cyclone separation tower through the external powder box and pipeline, and then enters the powder supply box for recycling after being processed by the cyclone separation tower.

[0068] (VI) Rotor powder scraping: The powdered rotor workpiece is sent to the powder scraping area of ​​the powder scraping mechanism through the lower twin screw. The position of the powder scraping blade is adjusted in advance by the handle to ensure the pressure and elasticity of the powder scraping blade in contact with the rotor workpiece. The powder scraping blade scrapes the outer surface of the rotor workpiece. When the two axial ends of the rotor workpiece pass through the duckbill blowing nozzle position, the duckbill blowing nozzle blows off the insulating powder on the two axial ends of the rotor; the excess powder enters the cyclone separation tower through the external powder box and the pipeline, and then enters the powder supply box after being processed by the cyclone separation tower and recycled again;

[0069] (VII) Rotor powder suction: After the rotor powder is scraped off, the powder enters the rotor powder suction mechanism for vacuum powder suction. The vacuum generator and the powder suction head directly transfer the powder at the rotor workpiece powder suction part into the powder supply box for reuse;

[0070] (VIII) High-frequency heating curing: After the rotor absorbs the powder, it is sent to the high-frequency heating curing zone through the lower twin screw for high-temperature curing. The surface of the rotor workpiece is heated to 25±3°C higher than the melting temperature of the powder, and the powder covering the surface of the rotor workpiece and the chip slot is melted and leveled; at the same time, when the rotor workpiece passes the position of the capillary blowing pipe, the capillary blowing pipe blows and removes the powder at the positions at both ends of the rotor workpiece that do not need to be powdered; the blown-off powder is sucked into the pipeline through the inlet pipe of the dust collection cabinet, and then the outlet pipe is connected to the on-site sewage treatment pipeline. The powder sucked in by the high-frequency heating curing zone is no longer recycled after being processed by the dust collection cabinet, and is discharged after entering the sewage treatment pipeline;

[0071] (IX) Cooling inspection: After high-frequency heating and curing, the rotor workpiece is sent to the cooling mechanism through the lower twin screw for cooling until the surface temperature is 35±2°C. The rotor workpiece is removed and placed under a magnifying glass to inspect for bubbles, missing materials, and defects. After the inspection is completed, the powder coating tooling is removed by an automatic disassembly machine, and the insulating powder on the powder coating tooling is cleaned and recycled;

[0072] (10) Secondary heating and curing: Place the rotor workpiece in an oven, adjust the heating temperature, and maintain it for a certain period of time for secondary heating and curing so that it meets the designed bonding strength and electrical strength. After cooling and passing the inspection, the rotor workpiece is transferred to the subsequent winding and other processing steps.

[0073] Before starting the electrostatic powder coating of automobile motor rotors in the present invention, please follow the following sequence of operations. Turn on the cooling water tower and circulating water switch connected to the factory; turn on the insulation powder cyclone tower separation switch and the sewage treatment system connected to the factory again; turn on the exhaust fan power switch of the factory again; turn on the dust collection cabinet switch again, and turn on the total power of the electrostatic powder coating machine for automobile motor rotors again; turn on the high-temperature oil removal power switch, the cooling fan switch, the double-screw operation switch, the electrostatic fluidized bed switch, and the high-frequency heating and curing switch in sequence; finally, turn on the powder raising air pressure switch.

[0074] Before turning off the electrostatic powder coating machine for automobile motor rotors, please follow the sequence. First, turn off the high-frequency heating and curing switch, the electrostatic fluidized bed switch, the twin-screw operation switch, and the cooling fan switch in sequence; turn off the powder-raising air pressure switch again; turn off the high-frequency oil removal switch, the twin-screw operation switch, and the cooling fan switch in sequence again; turn off the electrostatic powder coating switch again; turn off the total power supply of the electrostatic powder coating machine for automobile motor rotors again; turn off the high-frequency heating and curing switch again; turn off the power supply of the exhaust fan connected to the factory again; turn off the sewage treatment system switch connected to the factory again, and finally turn off the cooling water tower switch and circulating water switch connected to the factory.

[0075] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make non-creative modifications to this embodiment as needed, but they are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. An all-in-one electrostatic powder coating machine for automobile motor rotors. Features: The invention comprises a high temperature oil removal mechanism (2), a material taking manipulator assembly (3), a cooling channel (4), an electrostatic powdering fluidized bed (5), a powder scraping mechanism (6), a powder suction mechanism (14), a high frequency heating and curing mechanism (7), a cooling mechanism (8), a dust suction cabinet 1 (9), a dust suction cabinet 2 (10), a cyclone separation tower (11), a powder supply box (15), an upper twin screw (20) and a lower twin screw (30). The upper twin screw (20) passes through the lower part of the high temperature oil removal mechanism (2). 0) A discharge screw position (1) is reserved at the feeding end of the high-temperature oil removal mechanism (2), the material taking robot assembly (3) is installed at the discharge side of the high-temperature oil removal mechanism (2) and the end of the upper twin screw (20), the lower twin screw (30) is installed below the upper twin screw (20), and the thread rotation direction of the lower twin screw (30) is opposite to that of the upper twin screw (20), the cooling channel (4), the electrostatic powdering fluidized bed (5), the powder scraping mechanism (6), the powder suction mechanism (14), the high frequency The high-frequency heating curing mechanism (7) and the cooling mechanism (8) are sequentially arranged along the feeding direction of the lower twin screw (30); the powder scraping mechanism (6) and the bottom of the electrostatic powdering fluidized bed (5) are connected to the cyclone separation tower (11); the other end of the cyclone separation tower (11) is connected to the inlet pipe of the second dust collecting cabinet (10); the outlet pipe of the second dust collecting cabinet (10) is connected to the on-site sewage treatment pipeline for discharge; the inlet pipe of the first dust collecting cabinet (9) is connected to the bottom pipeline of the high-frequency heating curing mechanism (7); the outlet pipe of the first dust collecting cabinet (9) is connected to the on-site sewage treatment pipeline for discharge; The powder supply box (15) is installed at the bottom of the cyclone separation tower (11), and the powder supply box (15) supplies powder to the electrostatic powder coating fluidized bed (5) through a vacuum suction device; the two ends of the rotor workpiece (16) are respectively inserted into the left powder coating tool (17) and the right powder coating tool (18), and are fixed by inserting the elastic plug (19) into the connection port, and the installed rotor workpiece (16) is placed in the spiral track of the upper double screw (20) of the discharge screw position (1) for loading.

2. The electrostatic powder coating machine for automobile motor rotors according to claim 1, Features: Side guard bars (21) are provided on both sides of the upper twin screw (20) and the lower twin screw (30); when the rotor workpiece (16) is placed on the twin screw, it forms an angle of 80°±3° with the side guard bars (21); and evenly distributed bearing brackets are provided at the bottom of the upper twin screw (20) and the lower twin screw (30), and the bearing brackets are composed of a support seat (201) and a bearing (202).

3. The electrostatic powder coating machine for automobile motor rotors according to claim 2, Features: The high-temperature oil removal mechanism (2) comprises a high-frequency heating tube (23) and a smoke collecting hood (31) arranged above the upper twin screw (20).

4. The electrostatic powder coating machine for automobile motor rotors according to claim 3, Features: The material picking robot assembly (3) comprises a linear motor (26), a finger cylinder (27), a linear guide rail (28) and a horizontal cylinder (29), wherein the linear motor (26) is mounted on the linear guide rail (28), the horizontal cylinder (29) drives the linear motor (26) to move horizontally along the linear guide rail (28), the finger cylinder (27) is mounted on the linear motor (26), and the linear motor (26) drives the finger cylinder (27) to move up and down.

5. The electrostatic powder coating machine for automobile motor rotors according to claim 4, Features: The electrostatic powder-coating fluidized bed (5) comprises a powder feed pipe (51) installed in a fluidized bed body (60), a powder feed outlet (52), an electrostatic net (54), a porous plate (55), an upward pipe (56), a lower chamber (57), an external powder box (58) and a vibrator (59), wherein the powder feed pipe (51) is connected to a powder supply box (46), the feed pipe (51) is arranged at the top of the fluidized bed body (60), and the lower twin screw (30) passes through the fluidized bed body (60). The porous plate (55) divides the interior of the fluidized bed into two upper and lower chambers. The lower twin screw (30) is located in the lower chamber (57). The upward pipe (56) is installed in the lower chamber (57). The electrostatic net (54) is arranged between the porous plate (55) and the lower twin screw (30). The powder inlet outlet (52) is arranged at the upper end of the upper chamber. The powder inlet outlet (52) is connected to the outer powder box (58) at the bottom of the fluidized bed. The vibrator (59) is installed at the bottom of the lower chamber (57).

6. The electrostatic powder coating machine for automobile motor rotors according to claim 5, Features: The powder scraping mechanism (6) comprises a height adjustment component (40) and a plurality of powder scraping blades (37) mounted on the height adjustment component (40), the height adjustment component (40) comprises a powder scraping component (63) and a rotating screw, the rotating screw is threadedly connected to the powder scraping component (63), the powder scraping blade (37) is mounted on the powder scraping component (63), the powder scraping blade (37) is arranged at a certain inclination angle in both the vertical direction and the horizontal direction, a duckbill air blowing nozzle (36) is respectively installed on both sides of the powder scraping blade (37), and the duckbill air blowing nozzle (36) is connected to an air pump; the powder suction mechanism comprises a joint (66), a vacuum generator (67), an adjusting member (68) and a powder suction head (69), the vacuum generator (67) is mounted on the adjusting member (68), the powder suction head (69) is mounted on the vacuum generator (67), and the vacuum generator (67) is directly connected to the powder supply box (15) through the joint (66) and the vacuum powder suction pipe (38).

7. The electrostatic powder coating machine for automobile motor rotors according to claim 6, Features: The high-frequency heating and curing mechanism (7) comprises a high-frequency heating water-cooled copper tube (70) and a plurality of capillary blowing tubes (71), and the plurality of capillary blowing tubes (71) are distributed at both ends of the rotor workpiece (16).

8. The electrostatic powder coating machine for automobile motor rotors according to claim 7, Features: The cooling mechanism (8) comprises an isolation cover (72) and a plurality of small heat dissipation fans (73); the isolation cover (72) is installed above the lower twin screw (30); and the small heat dissipation fans (73) are installed below the lower twin screw (30).

9. The electrostatic powder coating machine for automobile motor rotors according to claim 8, Features: The side guard bars (21), the upper twin screws (20) and the different processing areas of the lower twin screws (30) are all made of a variety of materials.

10. A method for electrostatic powder coating of automobile motor rotors. Features: The following steps are involved: (I) Cleaning and installation of rotor workpiece: After the rotor workpiece is cleaned by ultrasonic cleaning, the two ends are covered with powder-coated tooling, and the elastic plug is inserted into the connection port for fixing. After insertion and clamping, the pull-out force is about 20N; (ii) Discharging: Place the rotor workpiece installed on the powder coating tooling onto the upper twin screw at the discharging screw position, and the upper twin screw will send the rotor workpiece into the high-frequency degreasing area for degreasing; (III) High-frequency oil removal: The rotor workpiece enters the high-frequency oil removal zone and is heated by electromagnetic induction of the high-frequency heating tube. The continuous heating allows the oil in the chip slot gap of the rotor workpiece to evaporate, and the volatile oil fume inside is extracted by the fume hood for centralized treatment; (IV) Unloading cooling: The rotor workpiece is transferred to the lower twin screw by the material taking manipulator assembly for reverse transportation, and cooled through the ventilation cooling channel. The small heat dissipation fan in the cooling channel is aimed at the workpiece to blow air for cooling, and the rotor workpiece is cooled to 35℃±2℃; (V) Electrostatic powdering: After cooling, the rotor workpiece is continuously transported by the lower twin screw into the electrostatic powdering fluidized bed. While the lower twin screw is transporting forward, the rotor workpiece rotates to be electrostatically powdered. Excess powder enters the cyclone separation tower through the external powder box and pipeline, and then enters the powder supply box for recycling after being processed by the cyclone separation tower. (VI) Rotor powder scraping: The powdered rotor workpiece is sent to the powder scraping area of ​​the powder scraping mechanism through the lower twin screw. The position of the powder scraping blade is adjusted in advance by the handle to ensure the pressure and elasticity of the powder scraping blade in contact with the rotor workpiece. The powder scraping blade scrapes the outer surface of the rotor workpiece. When the two axial ends of the rotor workpiece pass through the duckbill blowing nozzle position, the duckbill blowing nozzle blows off the insulating powder on the two axial ends of the rotor; the excess powder enters the cyclone separation tower through the external powder box and the pipeline, and then enters the powder supply box after being processed by the cyclone separation tower and recycled again; (VII) Rotor powder suction: After the rotor powder is scraped off, the powder enters the rotor powder suction mechanism for vacuum powder suction. The vacuum generator and the powder suction head directly send the powder at the rotor workpiece powder suction part into the powder supply box for recycling; (VIII) High-frequency heating curing: After the rotor absorbs the powder, it is sent to the high-frequency heating curing zone through the lower twin screw for high-temperature curing. The surface of the rotor workpiece is heated to 25±3°C higher than the melting temperature of the powder, and the powder covering the surface of the rotor workpiece and the chip slot is melted and leveled; at the same time, when the rotor workpiece passes the position of the capillary blowing pipe, the capillary blowing pipe blows and removes the powder at the positions at both ends of the rotor workpiece that do not need to be powdered; the blown-off powder is sucked into the pipeline through the dust collection cabinet for post-processing, and then the dust collection cabinet outlet pipe is connected to the on-site sewage treatment pipeline. The powder sucked in by the high-frequency heating curing zone is no longer recycled after being processed by the dust collection cabinet, and is discharged after entering the sewage treatment pipeline; (IX) Cooling inspection: After high-frequency heating and curing, the rotor workpiece is sent to the cooling mechanism through the lower twin screw for cooling until the surface temperature is 35±2°C. The rotor workpiece is removed and placed under a magnifying glass to inspect for bubbles, missing materials, and defects. After the inspection is completed, the powder coating tooling is removed by an automatic disassembly machine, and the insulating powder on the powder coating tooling is cleaned and recycled; (10) Secondary heating and curing: Place the rotor workpiece in an oven, adjust the heating temperature, and maintain it for a certain period of time for secondary heating and curing so that it meets the designed bonding strength and electrical strength. After cooling and passing the inspection, the rotor workpiece is transferred to the subsequent winding and other processing steps.

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