An electrostatic powder coating machine for automobile motor rotors and its processing method

Abstract

The present invention discloses an electrostatic powder coating machine for automobile motor rotors and a processing method thereof. The electrostatic powder coating machine comprises a high-temperature oil removal mechanism, a material retrieving 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 collection cabinet, a cyclone separation tower, a powder supply box, an upper twin screw, and a lower twin screw. The processing method comprises the following steps: (1) cleaning and installing the rotor workpiece; (2) unloading; (3) high-frequency oil removal; (4) unloading and cooling; (5) electrostatic powder coating; (6) rotor powder scraping; (7) rotor powder suction; (8) high-frequency heating and curing; (9) cooling detection; and (10) secondary heating and curing. The present invention adopts a double-layer raceway structure design, which reduces the equipment footprint; after adopting the powder scraping blade structure, the problem of material shortage and uneven thickness in the automobile motor rotor chip is eliminated. The problem of poor powder coating quality in the chip slot is eliminated, and the insulation powder recovery rate is increased by 5.6%.

Description

Technical Field

[0001] The present 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 automotive power management system motors, such as throttle motors, and brake management system motors, such as electronic parking brake motors, is prepared using an electrostatic fluidized bed method for powder coating and heat curing. Existing methods and technical documentation, including similar patent applications, mostly describe the operation and simple recovery of powder in the electrostatic fluidized bed. However, few have proposed an all-in-one machine that performs high-frequency degreasing of the rotor workpiece (in the case of automotive motor rotors), powder coating in the electrostatic fluidized bed, scraping the workpiece surface, high-frequency heating and curing, and then cooling the workpiece. Similar electrostatic powder coating machines were previously developed, but after high-frequency degreasing, a single-layer screw was used for rolling. To ensure cooling time, a longer rolling track was required, making the machine longer and occupying more space. The powder scraping process can easily remove the insulation powder from the workpiece, such as the automotive motor rotor chips. This can lead to pores and shrinkage after curing, material shortages, and uneven thickness, resulting in low rotor dielectric strength, leakage current, and low insulation resistance. Furthermore, existing technologies require manual replenishment of the insulation powder and cannot effectively monitor the insulation powder level. Older vacuum tubes are bulky and require a long preheating time. Early electrostatic generators lacked arc protection and were prone to fire despite being grounded. When the electrostatic net is placed beneath the porous plate of the fluidized bed, the negative static charge decays in the air, requiring increased static voltage to ensure adsorption strength. Furthermore, when the net is placed close to the porous plate, the arc light generated by its strong ionization can easily burn the plate and cause a fire, thus not being energy-efficient and posing a fire hazard. On the other hand, the traditional single air intake stream causes accumulation and uneven thickness of insulating powder in the fluidized bed powder bed. Both the scraping powder from the electrostatic powder application area and the scraping powder recovery in the high-frequency heating and curing area enter the recovery pipeline, which can easily generate impurities and result in a low insulating powder recovery rate. The old-fashioned high-frequency machine in the high-frequency heating and curing area has no overheating, water default, overcurrent, overvoltage, or undervoltage alarm devices. Summary of the Invention

[0003] The purpose of the present invention is to provide an all-in-one 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 electrostatic powdering machine for automobile motor rotors, consisting of a high-temperature degreasing mechanism, a material-retrieving manipulator assembly, a cooling channel, an electrostatic powder-retrieving fluidized bed, a powder scraping mechanism, a powder suction mechanism, a high-frequency heating and curing mechanism, a cooling mechanism, a dust collection cabinet 1, a dust collection 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 hot degreasing mechanism, and a discharge screw position is left at the feeding end of the high-temperature degreasing mechanism on the upper twin screw. The material-retrieving manipulator assembly is installed on the discharge side of the high-temperature degreasing mechanism and the end of the upper twin screw. The lower twin screw is installed under 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-retrieving fluidized bed, the powder scraping mechanism, the powder suction mechanism, the high-frequency heating and curing mechanism, the cooling mechanism, a dust collection cabinet 1, a dust collection cabinet 2, a cyclone separation tower, a powder supply box, an upper twin screw and a lower twin screw. 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 is connected to the bottom of the electrostatic powder-coating fluidized bed and the cyclone separation tower pipeline. The other end of the cyclone separation tower is connected to the inlet pipe of the dust collection cabinet 2, and the outlet pipe of the dust collection cabinet 2 is connected to the on-site sewage treatment pipeline for discharge. The inlet pipe of the dust collection cabinet 1 is connected to the bottom pipe of the high-frequency heating and curing mechanism, and the outlet pipe of the dust collection cabinet 1 is connected to the on-site sewage treatment pipeline. The powder supply box is installed at the bottom of the cyclone separation tower, and 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 connection port, and the installed rotor workpiece is placed in the screw groove of the upper twin screw at the discharge screw position for loading.

[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; the bottom of the upper twin screw and the lower twin screw is provided with evenly distributed bearing brackets, 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-grabbing 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, and the horizontal cylinder drives the linear motor to move horizontally along the linear guide. The finger cylinder is installed on the linear motor, and the linear motor 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 powder feed pipe is arranged at the top of the fluidized bed body, the lower twin screw is arranged 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 several 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 blades are installed on the powder scraping component, the powder scraping blades are set at a certain inclination angle in the vertical and horizontal directions, and 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 several small heat dissipation fans, the isolation cover is installed above the lower twin screw, and the small heat dissipation fans are installed below the lower twin screw.

[0013] Furthermore, the side baffles, the upper twin-screw, and the different processing areas of the lower twin-screw are all made of a variety of materials.

[0014] A method for electrostatic powder coating of an automobile motor rotor comprises the following steps:

[0015] (1) Cleaning and installation of the rotor workpiece: After the rotor workpiece is cleaned by ultrasonic cleaning, the two ends are covered with powder-coated tooling and fixed by inserting elastic plugs into the connection port. The pull-out force after clamping is controlled to be about 20N;

[0016] (2) Discharging: Place the rotor workpiece installed on the powder coating fixture onto the upper twin screw at the discharging screw position. The upper twin screw will send the rotor workpiece into the high-frequency degreasing area for degreasing.

[0017] (3) High-frequency degreasing: The rotor workpiece enters the high-frequency degreasing zone and is heated by the electromagnetic induction of the high-frequency heating tube. Continuous heating allows the oil in the gaps of the rotor workpiece chip slots to evaporate, and the volatile oil smoke inside is extracted by the smoke collection hood for centralized treatment;

[0018] (IV) Unloading cooling: The rotor workpiece is transferred to the lower twin-screw by the material-retrieving manipulator assembly and transported in reverse. It is cooled through the ventilation cooling channel. The small heat dissipation fan in the cooling channel blows air to cool the workpiece, cooling the rotor workpiece to 35℃±2℃;

[0019] (5) Electrostatic powdering: After cooling, the rotor workpiece continues to be transported by the lower twin screw into the electrostatic powdering fluidized bed. While the lower twin screw is transporting the rotor workpiece forward, it rotates and is electrostatically powdered. The 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] (6) Rotor powder scraping: The rotor workpiece that has been powdered is sent to the powder scraping area of ​​the powder scraping mechanism through the lower twin screw. The position of the powder scraper is adjusted in advance by the handle to ensure the pressure and elasticity of the powder scraper in contact with the rotor workpiece. The powder scraper scrapes the outer surface of the rotor workpiece. When the two shaft ends of the rotor workpiece pass through the position of the duckbill air nozzle, the duckbill air nozzle blows off the insulating powder on the two shaft 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] (7) Rotor powder suction: After the rotor scraping is completed, 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 position into the powder supply box for recycling;

[0022] (8) High-frequency heating and curing: After the rotor absorbs the powder, it is sent to the high-frequency heating and 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 powder from 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 outlet pipe of the dust collection cabinet is connected to the on-site sewage treatment pipeline. The powder sucked into the high-frequency heating and 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 reaches 35±2°C. The rotor workpiece is removed and placed under a magnifying glass to inspect for bubbles, missing materials, or 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, maintain it for a certain period of time, and perform secondary heating and curing to ensure 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. The high-frequency degreasing system utilizes a double-deck raceway structure. The upper raceway undergoes high-frequency degreasing while the lower raceway cools, reducing the footprint of the integrated system. The workpiece is then loaded onto the lower, cold raceway via a robotic gripper. The system, which performs high-frequency degreasing, electrostatically volatilizes powder onto the bed, scrapes the rotor workpiece surface, and heats and cures it, then cools the rotor workpiece. The total length of the integrated system has been reduced from 9.8m to 6.9m, a 29.59% reduction. The width remains unchanged at 2.2±0.1m.

[0027] 2. The powder scraping structure designed in this invention eliminates material shortages and uneven thickness in automotive motor rotor chips. The insulation powder recovery rate is increased by 5.6%. The electrostatic screen is directly embedded in the fluidized bed powder bed, in direct contact with the insulation powder, ensuring no attenuation of the high-voltage charge, eliminating fire hazards. The static voltage was set from -75kV to -100kV before the improvement to -35kV to -45kV after the improvement, reducing energy consumption.

[0028] 3. The dual air inlet channels are used to raise the powder gas and the fluidized bed vibration device is added to prevent the accumulation and uneven thickness of the insulating powder in the fluidized powder bed; the air pressure control adopts SMC's electrical proportional valve to control the air pressure of the electrostatic powder box, powder supply box, and powder extraction.

[0029] 4. The scraping blades of the powder scraping mechanism are designed with 0.188±0.02mmmm PET (mylar) material, and every two pieces form a pair, with a total of 46±2 pairs installed. The powder scraping mechanism adjusts the pressure and elastic force of the contact between the scraping blade and the workpiece, and by adjusting the vertical and horizontal inclination angles of the scraping blade, it is ensured that the scraping 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 This is a structural diagram of the electrostatic powder coating machine for automobile motor rotors according to the present invention;

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

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

[0033] Figure 4This is a schematic diagram of the structure of the rotor workpiece 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 diagram of the high-temperature oil removal mechanism;

[0036] Figure 7 It is a structural diagram of the component part of the reclaiming robot;

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

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

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

[0040] Figure 11 It is a structural diagram of the powder scraping mechanism;

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

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

[0043] Figure 14 It is a structural diagram of the powder suction mechanism;

[0044] Figure 15 This is a schematic diagram of the partial structure of the high-frequency heating and curing mechanism;

[0045] Figure 16 It is a structural diagram of the capillary blowing tube;

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

[0047] In the figure, 1. discharge 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 and 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. support seat; 202. bearing; 21. side guard; 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 nozzle; 37. Powder scraper; 38. Vacuum powder suction tube; 39. Vacuum pipe; 40. Height adjustment assembly; 41. Control valve 1; 42. Connecting pipe; 44. Powder delivery pipe; 45. Powder supply valve; 47. Recovery pipe; 48. Copper bar; 49. Copper block; 50. Control valve 2; 51. Powder inlet pipe; 52. Powder inlet outlet; 54. Electrostatic screen; 55. Perforated plate; 56. Upward pipe; 57. Lower chamber; 58. External powder box; 59. Vibrator; 60. Fluidized bed; 63. Powder scraper assembly; 641. Powder blowing part; 642. Powder suction part; 66. Connector; 67. Vacuum generator; 68. Adjustment part; 69. Powder suction head; 70. High-frequency heating water-cooled copper tube; 71. Capillary air pipe; 72. Isolation cover; 73. Small cooling fan. DETAILED DESCRIPTION

[0048] The present invention will be further described in detail below with reference to the accompanying drawings, clearly and completely describing the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts 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 powdering fluidized bed 5, a powder scraping mechanism 6, a powder suction mechanism, a high-frequency heating and curing mechanism 7, a cooling mechanism 8, a dust collection cabinet 1 9 and a dust collection 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 on the upper twin screw Below the screw 20, the thread rotation direction of the lower twin screw 30 is opposite to that of the upper twin screw 20. 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 2 10, and the outlet pipe of the dust collection cabinet 2 10 is connected to the on-site sewage treatment pipeline for discharge. The dust collection cabinet 1 9 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 1 9 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. The powder supply box 15 supplies powder to the electrostatic powder-coating fluidized bed 5 through a vacuum suction device.

[0050] Specifically, such as Figure 3 As shown, it is a structural schematic diagram of the rotor workpiece 16. 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, such as 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 powder coating tool body 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 fixture does not loosen during use, ensuring the stability of the powder coating size L, and preventing the rotor workpiece shaft core from being scratched during the rotation and forward movement. 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 electrode 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 twin screw 20 of the discharge screw position 1 for loading.

[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 fume hood 31 positioned above the upper twin-screw 20. When the rotor workpiece 16 reaches this point, it is heated by the high-frequency heating tube 23. Continued heating allows the oil in the chip slots of the rotor workpiece 16 to evaporate. This section of the upper twin-screw 20 is made of thermosetting insulating material. Cooling water circulates within the high-frequency heating tube, and the fume fumes emitted from the rotor workpiece 16 are extracted and centrally processed by the fume hood 31. The side bars 21 in this area are made of Bakelite.

[0054] Further, such as Figure 7 As shown, the material-retrieving robot assembly 3 includes a linear motor 26, a finger cylinder 27, a linear guide 28 and a horizontal cylinder 29. The linear motor 26 is installed on the linear guide 28, and the horizontal cylinder 29 drives the linear motor 26 to move horizontally along the linear guide 28. The finger cylinder 27 is installed on the linear motor 26, and the linear motor 26 drives the finger cylinder 27 to move up and down, moving 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 cooling fans 73 are evenly distributed in the channel to blow strong cooling to the surface of the rotor workpiece 16. The channel length is Q=2200±15mm, which can cool the rotor workpiece 16 to 35℃±2℃, which is convenient for subsequent electrostatic powdering. 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, powder supply box, and powder extraction; the size of the electrostatic powder box, powder supply box, and powder extraction air pressure are set separately on the touch screen, and the size of the above air pressure is monitored for precise control.

[0056] Specifically, the cyclone separation tower 11 and the connecting pipe 42 are connected to the dust collection cabinet 2 10 to provide vacuum suction for the cyclone separation tower. The regulating valve 1 41 and the regulating valve 2 50 are pipeline vacuum suction regulating valves used to adjust the vacuum suction of the vacuum pipeline 39 and the recovery pipe 47. The vacuum pump in the powder supply box 15 automatically and continuously supplies powder to the powder feeding pipe 44 to the electrostatic powder fluidized bed. Figure 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 the fluidized bed body 60. The powder feed pipe 51 is connected to the powder supply box 15, and the powder 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. 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. The powder feed outlet 52 is connected to the external powder box 58 at the bottom of the fluidized bed, and 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 holes of φ5mm±0.5, with a spacing of 30±1.5mm. Dried compressed air is introduced at both ends. The compressed air evenly fills the lower chamber 57 through the small holes in the upward pipe and enters the upper chamber through the pores of the porous plate 55. Powder enters the upper chamber through the vacuum pump from the powder supply box 15, the powder delivery pipe 44, and the powder inlet pipe 51. A certain pressure of gas is generated under the lower porous plate 55, which blows the powder up and passes through the electrostatic net 54. The electrostatic net 54 is directly embedded in the fluidized powder bed after improvement. The charge does not decay, so it directly contacts the powder and becomes negatively charged. The static voltage is set at (-35kV to -45kV), reducing energy consumption. By adjusting the air pressure in the upward pipe 56, the height of the powder in the upper chamber can be adjusted. Excess powder can escape into the outer powder box 58 and be recovered to the cyclone separation tower 11 through the recovery pipe 47. The powder supply 45 is turned on at a set time, and the insulating powder returns to the powder supply box 15. This ensures that the powdering surface height in the fluidized bed remains constant. As the rotor workpiece 16 passes through the fluidized bed, the negatively charged insulating powder is adsorbed onto the surfaces of the rotor workpiece 16 and the left and right powdering tools 17 and 18, respectively, because the contact potential is zero. This completes the insulating powder application. The side bars 21 in this area are made of brass rods. By adding a vibrator 59 to the bottom of the fluidized bed and controlling the vibration amplitude and frequency (i.e., the vibration intensity), the flow quality of the insulating powder in the fluidized bed is improved, insulating powder accumulation is avoided, and a stable and uniform powdering process is easily achieved. The twin-screw rotation speed is one of the key factors in ensuring the thickness of the insulating powder after curing. The spindle speed is controlled by a frequency converter (VFD), ensuring stable and reliable operation. The PLC immediately stops related equipment upon receiving an alarm signal, and provides audible and visual alarms, with the touchscreen displaying abnormal information. To eliminate the Faraday effect, the fluidized bed forms two levels for the insulating powder to be lifted. A fixed distance is maintained between the rotor workpiece and the dynamic liquid level of the fluidized bed. A certain level of lifting is required to ensure powder is applied to the rotor chip slots. An SMC electric proportional valve controls the air pressure in the electrostatic powder tank, powder supply tank, and powder extraction system. Furthermore, the time the rotor workpiece spends in the powder zone of the electrostatic fluidized bed is set by the PLC under VFD control, allowing for custom operation. The thickness of the high-frequency heating and curing process after powder application can be controlled by adjusting the electrostatic voltage and the application time. The twin-screw in this case is a thermosetting insulating material.

[0058] Further, such as Figure 11As shown, the scraping mechanism 6 includes a height adjustment component 40 and a plurality of scraping blades 37 mounted on the height adjustment component 40. The scraping blades 37 are made of 0.188±0.02mmmm PET (mylar) material. The height adjustment component 40 includes a scraping component 63 and a rotating screw. The rotating screw is threadedly connected to the scraping component 63. The scraping blades 37 are mounted on the scraping component 63. The scraping blades 37 are set at a certain inclination angle in both the vertical and horizontal directions. For details, refer to Figure 12 As shown, every 2 pieces form a pair, and a total of 46±2 pairs are installed. The scraping mechanism is used to adjust the pressure and elastic force of the scraping blade in contact with the workpiece. The scraping blade is inclined at A°±2° in the vertical direction and at B°±2° in the horizontal direction. For rotor workpieces with an outer diameter as small as φ30mm, the scraping 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 scraping blade. The lower twin screw rotates right, and the workpiece rotates right and continuously advances, so the scraping 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, thus eliminating the problem of poor powder quality in the chip slot. A duckbill air nozzle 36 is installed on each side of the scraping blade 37, and the duckbill air nozzle 36 is connected to the air pump.

[0059] like Figure 13 and Figure 14 As shown, the powder suction mechanism includes a connector 66, a vacuum generator 67, an adjustment member 68, and a powder suction head 69. The vacuum generator 67 is mounted on the adjustment member 68, and the powder suction head 69 is mounted on the vacuum generator 67. The vacuum generator 67 is directly connected to the powder supply box 15 via the connector 66 and the vacuum powder suction tube 38. The powder suction mechanism sucks powder at the rotor workpiece's powder suction area 642, while the duckbill air nozzle 36 in the powder scraping mechanism 6 blows powder at the powder blowing area 641. The blown powder enters the cyclone separation tower 11 for processing and then enters the powder supply box 15 for reuse. The powder suction area 642 is used for 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 easily blown away, resulting in material shortages and defects such as air holes in the rotor workpiece. The time the rotor workpiece spends in the powder scraping area is set by the twin-screw speed using a PLC controlled by a frequency converter, and the operating speed can be set automatically. Here, the twin-screw is made of thermosetting insulating material, and the side guard 21 is made of Bakelite.

[0060] Further, such as Figure 15 and Figure 16As shown, the high-frequency heating and curing mechanism 7 comprises a high-frequency heating water-cooled copper tube 70 and multiple capillary air blowing tubes 71. The high-frequency heating mechanism and the water-cooled copper tube 70 are combined. As the rotor workpiece 16 passes through, electromagnetic induction heating heats the rotor surface to a set temperature. The rotor workpiece surface temperature is set 25±3°C above the melting point of the insulating powder. At this temperature, the insulating powder in the rotor slots and on the rotor shaft core melts and flows flat, evenly covering the rotor workpiece surface and the rotor workpiece chip slots. Multiple capillary air blowing tubes 71 are located at both ends of the rotor workpiece, blowing air from the powder blowing area 641 and the powder suction area 642 of the rotor workpiece that do not require insulating powder. This second powder removal process removes excess insulating powder from the rotor tooling. This removed powder is then sucked in by the dust collector 9 inlet pipe and then discharged through the dust collector 9 outlet pipe, connected to the on-site sewage treatment pipeline, and is not reused. Once the rotor workpiece enters the high-frequency heating and curing zone, it still undergoes the stages of rotor preheating, initial melting of the insulating powder, complete melting and leveling, and initial curing. 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 Figure 13 ) have been completely blown to remove powder. Meanwhile, the time the rotor workpiece spends in the high-frequency heating and curing zone is controlled by a PLC controlled by a frequency converter for the lower twin-screw, allowing for customized operating speed settings. The side guards 21 in this area are made of Bakelite; the lower twin-screw 30 here is made of thermosetting insulation material.

[0061] Further, such as Figure 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 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 strong cooling air toward the surface of the rotor workpiece, and 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 under a magnifying glass for bubbles, missing materials, or defects. At this point, the operator or a designed automatic powder coating tool disassembly machine removes the left powder coating tool 17 and the right powder coating tool 18 from the rotor workpiece. The powder coating tool needs to be cleaned of scattered insulating powder in the cleaning room for reuse. There is an exhaust pipe above the isolation cover to exhaust 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 point, the rotor workpiece, i.e., the automotive motor rotor, has undergone high-frequency degreasing, electrostatic fluidization bed powdering, powder scraping in the powder scraping area, high-frequency heating and curing, and a cooling zone to complete the electrostatic powdering.

[0062] A method for electrostatic powder coating of an automobile motor rotor comprises the following steps:

[0063] (1) Cleaning and installation of the rotor workpiece: After the rotor workpiece is cleaned by ultrasonic cleaning, the two ends are covered with powder-coated tooling and fixed by inserting elastic plugs into the connection port. The pull-out force after clamping is controlled to be about 20N;

[0064] (2) Discharging: Place the rotor workpiece installed on the powder coating fixture onto the upper twin screw at the discharging screw position. The upper twin screw will send the rotor workpiece into the high-frequency degreasing area for degreasing.

[0065] (3) High-frequency degreasing: The rotor workpiece enters the high-frequency degreasing zone and is heated by the electromagnetic induction of the high-frequency heating tube. Continuous heating allows the oil in the gaps of the rotor workpiece chip slots to evaporate, and the volatile oil smoke inside is extracted by the smoke collection hood for centralized treatment;

[0066] (IV) Unloading cooling: The rotor workpiece is transferred to the lower twin-screw by the material-retrieving manipulator assembly and transported in reverse. It is cooled through the ventilation cooling channel. The small heat dissipation fan in the cooling channel blows air to cool the workpiece, cooling the rotor workpiece to 35℃±2℃;

[0067] (5) Electrostatic powdering: After cooling, the rotor workpiece continues to be transported by the lower twin screw into the electrostatic powdering fluidized bed. While the lower twin screw is transporting the rotor workpiece forward, it rotates and is electrostatically powdered. The 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] (6) Rotor powder scraping: The rotor workpiece that has been powdered is sent to the powder scraping area of ​​the powder scraping mechanism through the lower twin screw. The position of the powder scraper is adjusted in advance by the handle to ensure the pressure and elasticity of the powder scraper in contact with the rotor workpiece. The powder scraper scrapes the outer surface of the rotor workpiece. When the two shaft ends of the rotor workpiece pass through the position of the duckbill air nozzle, the duckbill air nozzle blows off the insulating powder on the two shaft 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] (7) Rotor powder suction: After the rotor scraping is completed, 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 position into the powder supply box for reuse;

[0070] (8) High-frequency heating and curing: After the rotor absorbs the powder, it is sent to the high-frequency heating and 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 air to remove powder from 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 connected to the on-site sewage treatment pipeline through the outlet pipe. The powder sucked in by the high-frequency heating and 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 reaches 35±2°C. The rotor workpiece is removed and placed under a magnifying glass to inspect for bubbles, missing materials, or 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, maintain it for a certain period of time, and perform secondary heating and curing to ensure 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 machine for automobile motor rotors, please follow the following sequence: First, turn on the cooling water tower and circulating water switches connected to the factory; then, turn on the insulation powder cyclone tower separation switch and the sewage treatment system connected to the factory; then, turn on the factory exhaust fan power switch; then, turn on the dust collection cabinet switch, and then turn on the main power of the electrostatic powder coating machine for automobile motor rotors; then, in sequence, turn on the high-temperature oil removal power switch, the cooling fan switch, the twin-screw operation switch, the electrostatic fluidized bed switch, and the high-frequency heating and curing switch; finally, turn on the powder raising air pressure switch.

[0074] Before shutting down the electrostatic powder coating machine for automotive motor rotors, please follow this sequence: First, turn off the high-frequency heating and curing switches, the electrostatic fluidized bed switch, the twin-screw operation switch, and the cooling fan switch. Next, 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. Again, turn off the electrostatic powder coating switch. Again, turn off the main power supply to the electrostatic powder coating machine for automotive motor rotors. Again, turn off the high-frequency heating and curing switch. Again, turn off the power supply to the exhaust fan connected to the workshop. Again, turn off the sewage treatment system connected to the workshop. Finally, turn off the cooling water tower and circulating water switches connected to the workshop.

[0075] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An all-in-one electrostatic powder coating machine for automobile motor rotors, characterized by: 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 collection cabinet (9), a dust collection cabinet (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 manipulator 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 and 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 dust collection cabinet 2 (10), the outlet pipe of the dust collection cabinet 2 (10) is connected to the on-site sewage treatment pipeline, the inlet pipe of the dust collection cabinet 1 (9) is connected to the bottom pipe of the high-frequency heating and curing mechanism (7), the outlet pipe of the dust collection cabinet 1 (9) 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; 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 on 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, characterized in that: 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 bottoms 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, characterized in that: 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, characterized in that: The material-retrieving manipulator assembly (3) includes 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), 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.

5. The electrostatic powder coating machine for automobile motor rotors according to claim 4, characterized in that: The electrostatic powder-coating fluidized bed (5) comprises 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 the fluidized bed body (60). The powder feed pipe (51) is connected to the powder supply box (15). The powder feed pipe (51) is arranged at the top of the fluidized bed body (60). 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, and 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, characterized in that: The powder scraping mechanism (6) includes 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) 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 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 installed on each side of the powder scraping blade (37), and the duckbill air blowing nozzle (36) is connected to the air pump; the powder suction mechanism includes 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, characterized in that: 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), wherein 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, characterized in that: The cooling mechanism (8) comprises an isolation cover (72) and a plurality of small heat dissipation fans (73), wherein 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, characterized in that: Different processing areas of the side baffles (21), the upper twin screw (20), and the lower twin screw (30) are all made of a variety of materials.

10. A method for electrostatic powder coating of automobile motor rotors, characterized by: The following steps are involved: (1) Cleaning and installation of the rotor workpiece: After the rotor workpiece is cleaned by ultrasonic cleaning, the two ends are covered with powder-coated tooling and fixed by inserting elastic plugs into the connection port. After insertion and clamping, the pull-out force is about 20N; (2) Discharging: Place the rotor workpiece installed on the powder coating fixture onto the upper twin screw at the discharging screw position. The upper twin screw will send the rotor workpiece into the high-frequency degreasing area for degreasing. (3) High-frequency degreasing: The rotor workpiece enters the high-frequency degreasing zone and is heated by the electromagnetic induction of the high-frequency heating tube. Continuous heating allows the oil in the gaps of the rotor workpiece chip slots to evaporate, and the volatile oil smoke inside is extracted by the smoke collection hood for centralized treatment; (IV) Unloading cooling: The rotor workpiece is transferred to the lower twin-screw by the material-retrieving manipulator assembly and transported in reverse. It is cooled through the ventilation cooling channel. The small heat dissipation fan in the cooling channel blows air to cool the workpiece, cooling the rotor workpiece to 35℃±2℃; (5) Electrostatic powdering: After cooling, the rotor workpiece continues to be transported by the lower twin screw into the electrostatic powdering fluidized bed. While the lower twin screw is transporting the rotor workpiece forward, it rotates and is electrostatically powdered. The 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. (6) Rotor powder scraping: The rotor workpiece that has been powdered is sent to the powder scraping area of ​​the powder scraping mechanism through the lower twin screw. The position of the powder scraper is adjusted in advance by the handle to ensure the pressure and elasticity of the powder scraper in contact with the rotor workpiece. The powder scraper scrapes the outer surface of the rotor workpiece. When the two shaft ends of the rotor workpiece pass through the position of the duckbill air nozzle, the duckbill air nozzle blows off the insulating powder on the two shaft 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; (7) Rotor powder suction: After the rotor powder is scraped, it 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; (8) High-frequency heating and curing: After the rotor absorbs the powder, it is sent to the high-frequency heating and 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 air to remove powder from 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 into the high-frequency heating and 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 reaches 35±2°C. The rotor workpiece is removed and placed under a magnifying glass to inspect for bubbles, missing materials, or 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, maintain it for a certain period of time, and perform secondary heating and curing to ensure that it meets the designed bonding strength and electrical strength. After cooling and passing the inspection, the rotor workpiece enters the subsequent winding processing step.

Images