Processing technology for squirrel-cage rotor of large asynchronous motor

Abstract

The invention relates to the field of rotor processing, in particular to a large asynchronous motor squirrel-cage rotor processing technology which comprises the steps of 1, material preparation, 2, iron core manufacturing, 3, guide bar installation, 4, end ring welding, 5, welding position cooling, 6, dynamic balance correction, 7, machining and 8, surface treatment. Step 9, quality detection; according to the processing technology of the squirrel-cage rotor of the large asynchronous motor, the magnetic conductive silicon steel sheet with the accurate thickness is selected and coated with the anti-corrosion layer after accurate annealing treatment, the electromagnetic conversion efficiency is remarkably improved, the service life is remarkably prolonged, the end rings and the conducting bars are welded through electromagnetic heating, and high-quality welding and mechanical strength are ensured; the air cooling mechanism is used for rapidly cooling to reduce thermal stress, the production efficiency is improved, the operation stability and the user satisfaction degree are improved through automatic dynamic balance detection, an anti-corrosion layer is applied through the electrostatic spraying technology, the protection effect is enhanced, precise support is provided, and the assembly precision and consistency are guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of rotor processing, and specifically to a processing technology for the squirrel-cage rotor of a large asynchronous motor. Background Art

[0002] The existing production processes for the squirrel-cage rotors of large asynchronous motors have various defects, which limit the product performance and production efficiency. The improper selection of core materials results in low electromagnetic conversion efficiency; the traditional anti-corrosion coating is unevenly applied and insufficient in thickness, shortening the service life; the welding quality is unstable, affecting the overall mechanical strength; the cooling system design is unreasonable, reducing the production efficiency; the dynamic balance adjustment relies on manual operation with low precision, resulting in high noise and obvious vibration during operation; and there is a lack of flexible and precise support structures during the assembly process, making it difficult to ensure the coaxiality and parallelism of each component. These problems not only increase the maintenance cost but also reduce the working performance of the motor and user satisfaction. Therefore, how to overcome the above-mentioned technical problems and defects has become a key issue to be solved. Summary of the Invention

[0003] The object of the present invention is to overcome the defects described in the background art, thereby realizing a processing technology for the squirrel-cage rotor of a large asynchronous motor. This technology significantly improves the electromagnetic conversion efficiency and service life by selecting magnetic silicon steel sheets with precise thickness and applying an anti-corrosion layer after precise annealing treatment, uses electromagnetic heating to weld the end rings and bars to ensure high-quality welding and mechanical strength, has an air-cooling mechanism to quickly cool down and reduce thermal stress, improves the production efficiency, has an automatic dynamic balance detection to enhance the running stability and user satisfaction, applies an anti-corrosion layer using electrostatic spraying technology to enhance the protection effect, and provides precise support to ensure the assembly accuracy and consistency.

[0004] To achieve the above object of the invention, the technical solution of the present invention is: a processing technology for the squirrel-cage rotor of a large asynchronous motor, including the following steps: Step 1: Material preparation, select high-magnetic silicon steel sheets with a thickness of 0.5 mm as the core material, electrolytic copper as the bar material, and electrolytic copper as the material for the end rings.

[0005] Step 2: Core manufacturing, use a high-precision stamping die to punch the silicon steel sheets into the required shapes, stack them into a complete core, then anneal the core to improve the electromagnetic properties of the silicon steel sheets, and then apply an anti-corrosion layer on the silicon steel sheets for surface treatment.

[0006] Step 3: Bar installation, insert the bars into the corresponding core slots, then horizontally place the rotor core on the bracket through a lifting tool, and align the ends of each bar to the same plane through an alignment mechanism.

[0007] Step 4: End-ring welding. When the iron core is placed on the bracket, place the end-rings at both ends of the iron core. After aligning the bars, make the end-rings abut against the bars through the alignment mechanism, and weld the end-rings and the bars through the electromagnetic welding mechanism.

[0008] Step 5: Cooling the welding position. Rapidly cool the welding position through the air-cooling mechanism arranged at the bottom of the bracket.

[0009] Step 6: Dynamic balance correction. Detect the dynamic balance at different positions of the iron core through the detection unit arranged on the bracket, and then correct the iron core according to the detection results.

[0010] Step 7: Machining. Treat the surface of the iron core by turning and milling to ensure that the dimensions and surface roughness are within the appropriate ranges.

[0011] Step 8: Surface treatment. Apply an anti-corrosion layer to the rotor, and improve the coating uniformity and adhesion through electrostatic spraying technology.

[0012] Step 9: Quality inspection. Conduct overspeed and vibration tests on the completed rotor, and conduct appearance inspection and performance testing.

[0013] In the above-mentioned manufacturing process of the squirrel-cage rotor of the large asynchronous motor, during the annealing treatment in Step 2, the temperature range is 750 - 800 °C, the holding time is 1.5 - 2 hours, and the cooling method is oil cooling.

[0014] The thickness of the anti-corrosion layer is controlled between 6 - 8 μm.

[0015] In the above-mentioned manufacturing process of the squirrel-cage rotor of the large asynchronous motor, in the surface treatment in Step 8, the dry film thickness of the anti-corrosion layer is 45 - 58 μm.

[0016] In the above-mentioned manufacturing process of the squirrel-cage rotor of the large asynchronous motor, the bracket in Step 3 includes a C-shaped seat. Both end faces of the opening part of the C-shaped seat are horizontally provided with displacement cavities. A first hydraulic rod is horizontally and fixedly arranged inside the displacement cavity, and a displacement seat is fixedly arranged at the telescopic end of the first hydraulic rod.

[0017] Vertical support rods are fixedly arranged at the top of the C-shaped seat and the middle position of the top of the displacement seat. A semi-circular groove is opened at the top of the support rod, and the two semi-circular grooves are coaxially arranged.

[0018] In the above-mentioned manufacturing process of the squirrel-cage rotor of the large-scale asynchronous motor, the alignment mechanism in the third step includes first L-shaped frames vertically and fixedly arranged on both sides of the top end at the middle position of the C-shaped seat, and the short sides of the first L-shaped frames are horizontally arranged towards the displacement seat. A first extrusion ring coaxial with the semi-circular groove is arranged above the C-shaped seat, and the side part of the first extrusion ring is fixedly arranged at the end of the short side of the corresponding first L-shaped frame.

[0019] On both sides of the top end of the displacement seat, second L-shaped frames are vertically and fixedly arranged, the short sides of the second L-shaped frames are horizontally arranged towards the corresponding first L-shaped frames, and second hydraulic rods are horizontally and fixedly arranged at the short sides of each of the second L-shaped frames. A second extrusion ring coaxial with the first extrusion ring is arranged above the displacement seat, and the side part of the second extrusion ring is fixedly arranged at the telescopic end of the corresponding second hydraulic rod.

[0020] In the above-mentioned manufacturing process of the squirrel-cage rotor of the large-scale asynchronous motor, the electromagnetic welding mechanism in the fourth step includes sliding grooves horizontally opened on both sides of the C-shaped seat, a lead screw is horizontally rotatably arranged inside the sliding grooves, and a bidirectional motor for driving the lead screw to rotate is fixedly arranged on one side of the middle position of the C-shaped seat.

[0021] A support frame is slidably arranged in the sliding groove, the lead screw penetrates through the corresponding support frame and is in threaded connection with the support frame, and the two support frames are arranged oppositely. A heating ring coaxial with the first extrusion ring is arranged above the C-shaped frame, both sides of the heating ring are fixedly arranged with the corresponding support frames, and electromagnetic coils are fixedly arranged on the inner wall of the heating ring.

[0022] The inner diameter of the inner ring of the heating ring is larger than the outer diameter of the outer ring of the first extrusion ring.

[0023] In the above-mentioned manufacturing process of the squirrel-cage rotor of the large-scale asynchronous motor, the electromagnetic welding mechanism further includes a mounting plate fixedly arranged on the side part of the support rod at the top end of the C-shaped frame, an assembly frame is horizontally slidably arranged on the top end of the mounting plate, a third hydraulic rod is horizontally and fixedly arranged inside the assembly frame, and the telescopic end of the third hydraulic rod is fixedly connected with the mounting plate.

[0024] A chuck is fixedly arranged at the top end of the assembly frame, the chuck is coaxially arranged with the semi-circular groove, and a drive motor with a speed reducer for driving the chuck to rotate is fixedly arranged at the top end of the assembly frame.

[0025] In the above-mentioned manufacturing process of the squirrel-cage rotor of the large-scale asynchronous motor, a bottom plate is horizontally and fixedly arranged in the middle of the C-shaped frame, a liftable bracket is arranged above the bottom plate, and the top end of the bracket is designed to be similar to the shape of the rotor core. There are at least two bottom plates and they are respectively located below both ends of the bracket, and fourth hydraulic rods are vertically and fixedly arranged on the bottom plate, and the telescopic end of each fourth hydraulic rod is fixedly arranged with the corresponding bottom of the bracket.

[0026] In the above-mentioned manufacturing process of the squirrel-cage rotor of a large asynchronous motor, the air-cooling mechanism in the fifth step includes air-cooling cavities with top openings formed at both ends of the bracket, and the air-cooling cavities are directly below the connection between the end ring and the bar.

[0027] An installation frame is fixedly arranged at the bottom of the bracket, a fan is fixedly arranged inside the installation frame, a multi-head pipe is connected to the outlet end of the fan, and the air outlets of the multi-head pipe are respectively communicated with the corresponding air-cooling cavities.

[0028] In the above-mentioned manufacturing process of the squirrel-cage rotor of a large asynchronous motor, the detection unit in the sixth step includes a detection cavity formed at the middle position of the top end of the bracket, and a liftable lifting plate is arranged inside the detection cavity. At both ends of the detection cavity below the lifting plate, fifth hydraulic rods are vertically and fixedly arranged, and the telescopic ends of the fifth hydraulic rods are fixedly connected to the bottom end of the lifting plate.

[0029] Multiple groups of detection rods are arranged on the lifting plate. The detection rods vertically penetrate through the lifting plate, and a fixed sleeve is horizontally fixedly arranged at the top end thereof. A roller is rotatably arranged at the top end of the fixed sleeve, and the axis of the roller is arranged parallel to the axis of the rotor. A baffle is fixedly arranged at the bottom end of the detection rod, a spring is arranged between the bottom of the baffle and the bottom end face of the detection cavity, a displacement sensor is fixedly arranged on the side of the baffle, and a receiver adapted to the displacement sensor is fixedly arranged inside the detection cavity on the side of the detection rod.

[0030] Compared with the prior art, the manufacturing process of the squirrel-cage rotor of a large asynchronous motor of the present invention has at least the following beneficial effects: In the manufacturing process of the squirrel-cage rotor of a large asynchronous motor of the present invention, by selecting high-permeability silicon steel sheets with a thickness of 0.5 mm as the core material and applying an anti-corrosion layer after annealing treatment, the electromagnetic conversion efficiency of the rotor can be effectively improved and the service life can be extended. In particular, the annealing temperature is controlled at 750 - 800 °C, the holding time is set to 1.5 - 2 hours, the cooling method is oil cooling, and the thickness of the anti-corrosion layer is controlled between 6 - 8 μm. The precise control of these parameters helps to optimize the electromagnetic properties of the silicon steel sheets.

[0031] In the manufacturing process of the squirrel-cage rotor of a large asynchronous motor of the present invention, when used in cooperation with a handheld fixture and the electromagnetic welding mechanism is adopted for connecting the end ring and the bar, the quality of the welding interface is ensured, the overall mechanical strength and reliability of the rotor are improved. In addition, an electromagnetic coil is arranged inside the heating coil, which can provide a uniform heat distribution, thereby ensuring the consistency and stability of the welding.

[0032] The processing technology of the squirrel-cage rotor of the large-scale asynchronous motor of the present invention. The design of the air-cooling mechanism enables the welding position to cool down rapidly, reducing the influence of thermal stress on the welding points. At the same time, it also speeds up the production rhythm and improves work efficiency.

[0033] The processing technology of the squirrel-cage rotor of the large-scale asynchronous motor of the present invention. The automatic dynamic balance detection and correction process realized by the detection unit not only improves the smoothness of the rotor during operation, but also reduces noise and vibration, thereby enhancing the working performance of the motor and user satisfaction.

[0034] The processing technology of the squirrel-cage rotor of the large-scale asynchronous motor of the present invention. The anti-corrosion layer is applied using electrostatic spraying technology, ensuring the uniformity and adhesion of the coating. The dry film thickness reaches 45 - 58 μm, further enhancing the protection effect.

[0035] The processing technology of the squirrel-cage rotor of the large-scale asynchronous motor of the present invention. The support structure composed of the C-shaped seat, displacement cavity, hydraulic rod, etc., and the alignment mechanism enable the rotor to be operated in a horizontal state, providing flexible and precise support and positioning functions, facilitating the operator to assemble and adjust. At the same time, it ensures the coaxiality and parallelism between components, which is beneficial to improving the accuracy and consistency of the product. Description of the Drawings

[0036] Figure 1 is a schematic diagram of the usage state of the equipment for the processing technology of the squirrel-cage rotor of the large-scale asynchronous motor of the present invention; Figure 2 is a schematic diagram of the overall structure of the equipment for the processing technology of the squirrel-cage rotor of the large-scale asynchronous motor of the present invention; Figure 3 is a schematic diagram of the structure of the electromagnetic welding mechanism for the processing technology of the squirrel-cage rotor of the large-scale asynchronous motor of the present invention; Figure 4 is a schematic diagram of the position of the third hydraulic rod for the processing technology of the squirrel-cage rotor of the large-scale asynchronous motor of the present invention; Figure 5 is a schematic diagram of the structure of the air-cooling mechanism for the processing technology of the squirrel-cage rotor of the large-scale asynchronous motor of the present invention; Figure 6 is a schematic diagram of the structure of the detection unit for the processing technology of the squirrel-cage rotor of the large-scale asynchronous motor of the present invention.

[0037] In the figure: 1. Support; 11. C-shaped seat; 12. Displacement cavity; 13. First hydraulic rod; 14. Displacement seat; 15. Support rod; 16. Semicircular groove; 2. Alignment mechanism; 21. First L-shaped frame; 22. First extrusion ring; 23. Second L-shaped frame; 24. Second hydraulic rod; 25. Second extrusion ring; 3. Electromagnetic welding mechanism; 31. Slide groove; 32. Lead screw; 33. Bidirectional motor; 34. Support frame; 35. Heating coil; 36. Electromagnetic coil; 37. Mounting plate; 38. Assembly rack; 39. Third hydraulic rod; 40. Chuck; 41. Driving motor; 4. Base plate; 5. Bracket; 6. Fourth hydraulic rod; 7. Air cooling mechanism; 71. Air cooling chamber; 72. Mounting frame; 73. Fan; 74. Multi - head pipe; 8. Detection unit; 81. Detection chamber; 82. Lifting plate; 83. Fifth hydraulic rod; 84. Detection rod; 85. Fixed sleeve; 86. Roller; 87. Baffle; 88. Spring; 89. Displacement sensor; 90. Receiver. Specific implementation mode

[0038] The large - scale asynchronous motor squirrel - cage rotor processing technology of the present invention will be described in more detail below in conjunction with the accompanying drawings and through specific implementation modes.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0040] The large - scale asynchronous motor squirrel - cage rotor processing technology of this embodiment, by selecting high - permeability silicon steel sheets with a thickness of 0.5 mm and applying an anti - corrosion layer of 6 - 8 μm after precise annealing treatment (750 - 800 °C, oil cooling for 1.5 - 2 hours), significantly improves the electromagnetic conversion efficiency and service life. The electromagnetic welding mechanism 3 is used in cooperation with a handheld fixture to connect the end ring and the conductor bar, ensuring high - quality welding and mechanical strength. The air cooling mechanism 7 rapidly cools down to reduce thermal stress and improve production efficiency. Automatic dynamic balance detection and correction improve the running stability and user satisfaction. The electrostatic spraying technology is used to apply an anti - corrosion layer of 45 - 58 μm, enhancing the protection effect. The C - shaped seat 11 and the horizontal operation support 1 provide precise support, ensuring the assembly accuracy and consistency. In this embodiment, it mainly includes the following steps: Step 1: Material preparation. Select high - permeability silicon steel sheets with a thickness of 0.5 mm as the core material to effectively improve the electromagnetic conversion efficiency of the rotor. Select electrolytic copper as the conductor bar material and electrolytic copper as the end - ring material.

[0041] Step 2: Iron core manufacturing, using high-precision stamping dies to punch the silicon steel sheet into the required shape, and stack it into a complete iron core, and then anneal the iron core. The temperature range during annealing is 750-800℃, and the holding time is 1.5-2 hours, so as to improve the electromagnetic properties of the silicon steel sheet. Annealing at a high temperature of 750-800℃ can effectively reduce the stress and impurities inside the silicon steel sheet, thereby reducing hysteresis loss. At the same time, it can refine the material grains and increase the magnetic permeability, thereby improving the starting characteristics and operating efficiency of the motor. And completely eliminate the internal stress generated during the processing to prevent deformation or cracks in subsequent use. The cooling method is oil cooling. Provide a faster cooling rate to ensure that the internal structure of the material is quickly fixed and avoid unnecessary phase changes.

[0042] After that, an anti-corrosion layer is applied to the silicon steel sheet for surface treatment. The thickness of the anti-corrosion layer is controlled between 6-8μm. It isolates the corrosion of air, moisture and harmful substances, significantly extending the service life of the material. The thin coating (6-8μm) has little effect on the magnetic permeability of the silicon steel sheet and hardly changes its electromagnetic properties, ensuring the efficient operation of the motor. It helps to reduce eddy current losses in the core and further improve the efficiency of the motor.

[0043] Step 3: Install the conductor bars. Insert the conductor bars into the corresponding core slots. Then use the hanger to place the rotor core horizontally on the bracket 1, and align the ends of each conductor bar to the same plane through the alignment mechanism 2. This allows subsequent welding or connection points to withstand mechanical stress more evenly and avoid stress concentration caused by protrusions or depressions of individual conductor bars, thereby improving the overall mechanical strength and reliability of the rotor. It can also reduce the difference in contact resistance, ensure a more even distribution of current in each conductor bar, and improve the consistency of electrical performance. It also helps to optimize the magnetic field distribution, reduce eddy current losses caused by uneven magnetic resistance, and improve the efficiency of the motor. Step 4: end ring welding. When the iron core is placed on the bracket 1, the end rings are placed at both ends of the iron core. After the conductor bars are aligned, the end rings are abutted against the conductor bars by the alignment mechanism 2, and the end rings are welded to the conductor bars by the electromagnetic welding mechanism 3.

[0044] Step 5: Cool the welding position. The air cooling mechanism 7 provided at the bottom of the bracket 1 can quickly cool the welding position. It can provide uniform and rapid cooling effect, effectively reduce the temperature gradient in the welding area, and avoid the concentration of thermal stress caused by local overheating. It also helps to fix the internal structure of the material and reduce the thermal expansion and contraction effects generated during the welding process, thereby preventing the rotor assembly from deforming or twisting. It also shortens the high temperature residence time, reduces defects such as pores and cracks that may occur during the welding process, and ensures that the quality of the welding interface is more stable and reliable. Step Six: Dynamic balance correction. The dynamic balance of different positions of the iron core is detected by the detection unit 8 provided on the bracket 1, and then the iron core is corrected according to the detection results.

[0045] Step Seven: Machining. The surface of the iron core is processed by turning and milling to ensure that the dimensions and surface roughness are within an appropriate range.

[0046] Step Eight: Surface treatment. An anti-corrosion layer is applied to the rotor, and the electrostatic spraying technology is used to improve the coating uniformity and adhesion. The dry film thickness of the anti-corrosion layer is 45 - 58 μm. It can provide protection for a longer time, effectively resist the erosion of air, moisture and chemical substances, and is especially suitable for harsh working environments. It can also prevent the formation of tiny cracks or pores, thus preventing pitting and rusting. Moreover, it can provide better impact resistance and wear resistance, reducing surface damage caused by collision or friction.

[0047] Step Nine: Quality inspection. The completed rotor is subjected to overspeed and vibration tests, and appearance inspection and performance tests are carried out.

[0048] To achieve the horizontal placement of the rotor, refer to Figures 1-3 , the bracket 1 in the above-mentioned Step Three includes a C-shaped seat 11. Displacement cavities 12 are horizontally opened at both end faces of the opening part of the C-shaped seat 11. A first hydraulic rod 13 is horizontally and fixedly arranged inside the displacement cavity 12, and a displacement seat 14 is fixedly arranged at the telescopic end of the first hydraulic rod 13. Control the first hydraulic rod 13 to work and adjust the length between the C-shaped seat 11 and the displacement seat 14. Vertical support rods 15 are fixedly arranged at the middle positions of the top of the C-shaped seat 11 and the top of the displacement seat 14. A semi-circular groove 16 is opened at the top of the support rod 15, and the two semi-circular grooves 16 are coaxially arranged. The two ends of the rotating shaft of the rotor iron core are respectively placed on the corresponding semi-circular grooves 16 through a lifting tool.

[0049] To make the positions of the bars consistent, refer to Figure 2 and Figure 3, in the alignment mechanism 2 in the third step, it includes first L-shaped frames 21 vertically and fixedly arranged on both sides of the top of the middle position of the C-shaped seat 11, and the short sides of the first L-shaped frames 21 are horizontally arranged towards the direction of the displacement seat 14. Above the C-shaped seat 11, there is a first extrusion ring 22 coaxial with the semi-circular groove 16, and the side of the first extrusion ring 22 is fixedly arranged with the end of the short side of the corresponding first L-shaped frame 21. On both sides of the top of the displacement seat 14, second L-shaped frames 23 are vertically and fixedly arranged, the short sides of the second L-shaped frames 23 are horizontally arranged towards the direction of the corresponding first L-shaped frame 21, and a second hydraulic rod 24 is horizontally and fixedly arranged at the short side of each second L-shaped frame 23. Above the displacement seat 14, there is a second extrusion ring 25 coaxial with the first extrusion ring 22, and the side of the second extrusion ring 25 is fixedly arranged with the telescopic end of the corresponding second hydraulic rod 24.

[0050] Control the first hydraulic rod 13 to work, drive the second extrusion ring 25 to move towards the first extrusion ring 22, so as to extrude the guide bar and make the ends of the guide bar in the same plane. Before that, the end ring can be placed at the corresponding position according to the actual situation, so as to abut and limit the end ring and the guide bar.

[0051] For the welding of the end ring and the guide bar, see Figure 2 and Figure 3 , in the electromagnetic welding mechanism 3 in the fourth step, it includes sliding grooves 31 horizontally opened on both sides of the C-shaped seat 11, a lead screw 32 is horizontally rotatably arranged inside the sliding grooves 31, and a bidirectional motor 33 for driving the lead screw 32 to rotate is fixedly arranged on one side of the middle position of the C-shaped seat 11. A support frame 34 is slidably arranged in the sliding groove 31, the lead screw 32 penetrates through the corresponding support frame 34 and is threadedly connected with the support frame 34, and the two support frames 34 are arranged oppositely. Above the C-shaped frame, there is a heating coil 35 coaxial with the first extrusion ring 22, both sides of the heating coil 35 are fixedly arranged with the corresponding support frames 34, and an electromagnetic coil 36 is fixedly arranged on the inner wall of the heating coil 35. The inner diameter of the inner ring of the heating coil 35 is larger than the outer diameter of the first extrusion ring 22. After the positions of the end ring and the guide bar are fixed, control the bidirectional motor 33 to work, drive the lead screw 32 to rotate, so that the support frame 34 moves in the sliding groove 31. When the heating coil 35 moves to the position where welding is required, control the electromagnetic coil 36 to work, so as to weld the end ring and the guide bar. When the welding of both places to be welded is completed, control the bidirectional motor 33 to work to make each part return to its original position.

[0052] The electromagnetic welding mechanism 3 further includes a mounting plate 37 fixedly arranged on the side of a support rod 15 at the top of a C-shaped seat 11. A mounting frame 38 is horizontally slidably arranged at the top of the mounting plate 37. A third hydraulic rod 39 is horizontally fixedly arranged inside the mounting frame 38. The telescopic end of the third hydraulic rod 39 is fixedly connected to the mounting plate 37. A chuck 40 is fixedly arranged at the top of the mounting frame 38. The chuck 40 is coaxially arranged with a semi-circular groove 16. A drive motor 41 with a speed reducer for driving the chuck 40 to rotate is fixedly arranged at the top of the mounting frame 38. Before placing the rotor, control the third hydraulic rod 39 to work, so that the mounting frame 38 drives the chuck 40 to slide backward on the mounting plate 37. After the rotor is placed, control the third hydraulic rod 39 to work, move the chuck 40 towards the end of the rotor shaft, and then control the chuck 40 to clamp the shaft.

[0053] To achieve cooling after welding, refer to Figure 5 , a bottom plate 4 is horizontally fixedly arranged in the middle of the C-shaped frame. A liftable bracket 5 is arranged above the bottom plate 4. The top of the bracket 5 is designed to be similar to the rotor core. At least two bottom plates 4 are provided and are respectively located below the two ends of the bracket 5. A fourth hydraulic rod 6 is vertically fixedly arranged on the bottom plate 4. The telescopic end of each fourth hydraulic rod 6 is fixedly arranged with the corresponding bottom of the bracket 5. When limiting the end ring and the guide bar, control the fourth hydraulic rod 6 to work to move the bracket 5 upward. Support the bottom of the rotor core through the bracket 5 to facilitate the subsequent fixation of the positions of the end ring and the guide bar. After the positions of the end ring and the guide bar are fixed, control the bracket 5 to drop. The air-cooling mechanism 7 in step five includes air-cooling cavities 71 with open tops provided at both ends of the bracket 5. The air-cooling cavities 71 are directly below the connection between the end ring and the guide bar. An installation frame 72 is fixedly arranged at the bottom of the bracket 5. A blower 73 is fixedly arranged inside the installation frame 72. The outlet end of the blower 73 is communicated with a multi-head pipe 74. The air outlets of the multi-head pipe 74 are respectively communicated with the corresponding air-cooling cavities 71. After welding is completed. Move the bracket 5 upward to make the top of the bracket 5 close to the welding position. And control the blower 73 to work to blow air through the multi-head pipe 74 into the air-cooling cavities 71, thereby air-cooling the welding position. During this process, control the drive motor 41 to work to drive the chuck 40 to rotate, so as to achieve uniform air-cooling of the welding position.

[0054] To perform dynamic balance detection on the rotor, refer to Figure 5 and Figure 6, the detection unit 8 in the sixth step includes a detection cavity 81 formed in the middle position at the top of the bracket 5, and a liftable lifting plate 82 is arranged inside the detection cavity 81. At both ends inside the detection cavity 81 below the lifting plate 82, fifth hydraulic rods 83 are vertically and fixedly arranged, and the telescopic ends of the fifth hydraulic rods 83 are fixedly connected to the bottom end of the lifting plate 82. A plurality of groups of detection rods 84 are arranged on the lifting plate 82. The detection rods 84 vertically penetrate the lifting plate 82, and a fixed sleeve 85 is horizontally fixedly arranged at the top end thereof. A roller 86 is rotatably arranged at the top end of the fixed sleeve 85, and the axis of the roller 86 is arranged parallel to the axis of the rotor. A baffle 87 is fixedly arranged at the bottom end of the detection rod 84, a spring 88 is arranged between the bottom of the baffle 87 and the bottom end face of the detection cavity 81, a displacement sensor 89 is fixedly arranged on the side of the baffle 87, and a receiver 90 adapted to the displacement sensor 89 is fixedly arranged inside the detection cavity 81 on the side of the detection rod 84. When performing dynamic balance detection, control the fifth hydraulic rod 83 to work, so that the roller 86 abuts against the rotor core through the lifting plate 82. At this time, control the driving motor 41 to work to drive the chuck 40 to rotate. At this time, the dynamic balance can be detected according to the lifting of the roller 86 on the lifting plate 82. During this process, the spring 88 loses weight and abuts the baffle 87 against the bottom of the lifting plate 82, and detection is performed through the displacement sensor 89 and the receiver 90.

[0055] Usage method of the processing technology of the squirrel-cage rotor of the large asynchronous motor of the present invention: First, control the first hydraulic rod 13 to work to adjust the length between the C-shaped seat 11 and the displacement seat 14. Place the two ends of the rotating shaft of the rotor core on the corresponding semi-circular grooves 16 respectively through a lifting tool. Before placing the rotor, control the third hydraulic rod 39 to work, so that the assembly frame 38 drives the chuck 40 to slide backward on the mounting plate 37. After the rotor is placed, control the third hydraulic rod 39 to work, move the chuck 40 towards the end of the rotor rotating shaft, and then control the chuck 40 to clamp the rotating shaft.

[0056] Control the first hydraulic rod 13 to work, drive the second extrusion ring 25 to move towards the first extrusion ring 22, so as to extrude the conducting bars and make the ends of the conducting bars in the same plane. When limiting the end ring and the conducting bars, control the fourth hydraulic rod 6 to work and move the bracket 5 upward. Support the bottom of the rotor core through the bracket 5 to facilitate the subsequent fixing of the positions of the end ring and the conducting bars. After the positions of the end ring and the conducting bars are fixed, control the bracket 5 to fall.

[0057] After the positions of the end ring and the conducting bar are fixed, control the operation of the bidirectional motor 33 to drive the lead screw 32 to rotate, so that the support frame 34 moves within the sliding groove 31. When the heating coil 35 moves to the position where welding is required, control the operation of the electromagnetic coil 36 to weld the end ring and the conducting bar. When welding is completed at both places to be welded, control the operation of the bidirectional motor 33 to return each part to its original position. After welding is completed. Move the bracket 5 upward so that the top of the bracket 5 approaches the welding position. And control the operation of the blower 73 to blow air through the multi-head pipe 74 into the air-cooling cavity 71 to air-cool and cool the welding position. During this process, control the operation of the drive motor 41 to drive the chuck 40 to rotate, so as to achieve uniform air-cooling of the welding position.

[0058] When performing dynamic balance detection, control the operation of the fifth hydraulic rod 83, so that the roller 86 abuts against the rotor core through the lifting plate 82. At this time, control the operation of the drive motor 41 to drive the chuck 40 to rotate. At this time, the dynamic balance can be detected according to the lifting of the roller 86 on the lifting plate 82. During this process, the spring 88 loses weight and abuts the baffle 87 against the bottom of the lifting plate 82, and detection is carried out through the displacement sensor 89 and the receiver 90.

[0059] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meaning understood by those of ordinary skill in the art to which the present invention belongs. As used in the specification and claims of this application, words such as "a" or "an" do not necessarily denote a limitation in quantity. Words such as "comprising" or "including" mean that the elements or items appearing before the word cover the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0060] In the foregoing, the exemplary embodiments of the present invention have been described in detail with reference to the preferred embodiments. However, those skilled in the art can understand that, without departing from the concept of the present invention, various modifications and variations can be made to the above specific embodiments, and various combinations can be made to the technical features and structures proposed by the present invention, without exceeding the protection scope of the present invention.

Claims

1. A large asynchronous motor squirrel cage rotor processing technology, characterized in that: The steps include: Step 1: Material preparation: select 0.5mm thick high magnetic permeability silicon steel sheet as the core material, select electrolytic copper as the conductor bar material, and select electrolytic copper as the end ring material; Step 2: Iron core manufacturing, using high-precision stamping dies to punch the silicon steel sheets into the required shape and stack them into a complete iron core. The iron core is then annealed to improve the electromagnetic properties of the silicon steel sheets, and then an anti-corrosion layer is applied to the silicon steel sheets for surface treatment; Step 3: installing the guide bars, inserting the guide bars into the corresponding core slots, and then horizontally placing the rotor core on the bracket (1) by means of a hanger, and aligning the ends of each guide bar to the same plane by means of an alignment mechanism (2); Step 4: end ring welding, when the iron core is placed on the bracket (1), the end rings are placed at both ends of the iron core, and after the conductor bars are aligned, the end rings are abutted against the conductor bars by the alignment mechanism (2), and the end rings are welded to the conductor bars by the electromagnetic welding mechanism (3); Step 5: Cooling the welding position, quickly cooling the welding position through an air cooling mechanism (7) provided at the bottom of the bracket (1); Step 6: Dynamic balance correction: dynamic balance detection is performed at different positions of the core by using a detection unit (8) arranged on the bracket (1), and then correction of the core is performed according to the detection result; Step 7: Mechanical processing: Process the surface of the core by turning and washing to ensure that the size and surface roughness are within the appropriate range; Step 8: Surface treatment: Apply an anti-corrosion layer to the rotor and use electrostatic spraying technology to improve coating uniformity and adhesion; Step 9: Quality inspection: conduct overspeed and vibration tests on the completed rotor, and conduct appearance inspection and performance testing.

2. The large asynchronous motor squirrel cage rotor processing technology according to claim 1 is characterized in that: The temperature range of the annealing treatment in the step 2 is 750-800° C., the holding time is 1.5-2 hours, and the cooling method is oil cooling; The thickness of the anti-corrosion layer is controlled between 6-8 μm.

3. The large asynchronous motor squirrel cage rotor processing technology according to claim 1 is characterized in that: In the surface treatment in step eight, the dry film thickness of the anti-corrosion layer is 45-58 μm.

4. The large asynchronous motor squirrel cage rotor processing technology according to claim 1 is characterized in that: The bracket (1) in step 3 comprises a C-shaped seat (11), and both end surfaces of the opening of the C-shaped seat (11) are horizontally provided with displacement cavities (12), a first hydraulic rod (13) is horizontally fixedly arranged inside the displacement cavity (12), and a displacement seat (14) is fixedly arranged at the telescopic end of the first hydraulic rod (13); A support rod (15) is vertically fixedly disposed at the top of the C-shaped seat (11) and at the middle of the top of the displacement seat (14). A semicircular groove (16) is formed at the top of the support rod (15), and the two semicircular grooves (16) are coaxially disposed.

5. The large asynchronous motor squirrel cage rotor processing process according to claim 4 is characterized in that: The alignment mechanism (2) in step 3 comprises a first L-shaped frame (21) vertically fixedly arranged on both sides of the top of the middle position of the C-shaped seat (11), the short side of the first L-shaped frame (21) is horizontally arranged in the direction of the displacement seat (14), and a first extrusion ring (22) coaxial with the semicircular groove (16) is arranged above the C-shaped seat (11), and the side of the first extrusion ring (22) is fixedly arranged corresponding to the short side end of the first L-shaped frame (21); A second L-shaped frame (23) is vertically fixedly arranged on both sides of the top of the displacement seat (14); the short sides of the second L-shaped frame (23) are horizontally arranged in the direction corresponding to the first L-shaped frame (21); a second hydraulic rod (24) is horizontally fixedly arranged at the short side of each second L-shaped frame (23); a second extrusion ring (25) coaxial with the first extrusion ring (22) is arranged above the displacement seat (14); the side of the second extrusion ring (25) is fixedly arranged with the telescopic end of the corresponding second hydraulic rod (24).

6. The large asynchronous motor squirrel cage rotor processing process according to claim 5 is characterized in that: The electromagnetic welding mechanism (3) in step 4 comprises a slide groove (31) horizontally provided on both sides of a C-shaped seat (11), a lead screw (32) being provided inside the slide groove (31) for horizontal rotation, and a bidirectional motor (33) for driving the lead screw (32) to rotate is fixedly provided on one side of the middle position of the C-shaped seat (11); A support frame (34) is slidably arranged in the slide groove (31), the lead screw (32) penetrates the corresponding support frame (34) and is threadedly connected to the support frame (34), the two support frames (34) are arranged opposite to each other, a heating ring (35) coaxial with the first extrusion ring (22) is arranged above the C-shaped frame, both sides of the heating ring (35) are fixedly arranged with the corresponding support frame (34), and an electromagnetic coil (36) is fixedly arranged on the inner wall of the heating ring (35); The inner diameter of the heating ring (35) is greater than the outer diameter of the first extrusion ring (22).

7. The large asynchronous motor squirrel cage rotor processing process according to claim 6 is characterized in that: The electromagnetic welding mechanism (3) further comprises a mounting plate (37) fixedly arranged on the side of the support rod (15) at the top end of the C-shaped seat (11); an assembly frame (38) is horizontally slidably arranged at the top end of the mounting plate (37); a third hydraulic rod (39) is horizontally fixedly arranged inside the assembly frame (38); and a telescopic end of the third hydraulic rod (39) is fixedly connected to the mounting plate (37); A chuck (40) is fixedly arranged at the top end of the assembly frame (38), the chuck (40) is coaxially arranged with the semicircular groove (16), and a driving motor (41) with a reducer for driving the chuck (40) to rotate is fixedly arranged at the top end of the assembly frame (38).

8. The large asynchronous motor squirrel cage rotor processing process according to claim 7 is characterized in that: A bottom plate (4) is fixedly arranged horizontally in the middle of the C-shaped frame, a liftable bracket (5) is arranged above the bottom plate (4), the top of the bracket (5) is designed to imitate the rotor core, the bottom plate (4) is provided with at least two and respectively located below the two ends of the bracket (5), a fourth hydraulic rod (6) is fixedly arranged vertically on the bottom plate (4), and the telescopic end of each of the fourth hydraulic rods (6) is fixedly arranged on the bottom of the corresponding bracket (5).

9. The large asynchronous motor squirrel cage rotor processing process according to claim 8, characterized in that: The air cooling mechanism (7) in step five comprises an air cooling cavity (71) with a top opening formed at both ends of the bracket (5), wherein the air cooling cavity (71) is located directly below the connection between the end ring and the guide bar; A mounting frame (72) is fixedly provided at the bottom of the bracket (5), a fan (73) is fixedly provided inside the mounting frame (72), an outlet end of the fan (73) is connected to a multi-head pipe (74), and air outlets of the multi-head pipe (74) are respectively connected to corresponding air cooling chambers (71).

10. The large asynchronous motor squirrel cage rotor processing process according to claim 9, characterized in that: The detection unit (8) in step six comprises a detection cavity (81) provided at the middle position of the top end of the bracket (5), a lift plate (82) being provided inside the detection cavity (81), and a fifth hydraulic rod (83) being vertically fixedly provided at both ends of the detection cavity (81) below the lift plate (82), and a telescopic end of the fifth hydraulic rod (83) being fixedly connected to the bottom end of the lift plate (82); The lifting plate (82) is provided with a plurality of detection rods (84), the detection rods (84) vertically penetrate the lifting plate (82) and a fixing sleeve (85) is fixedly provided at the top of the detection rods (84) horizontally, a roller (86) is rotatably provided at the top of the fixing sleeve (85), the axis of the roller (86) is arranged parallel to the axis of the rotor, a baffle (87) is fixedly provided at the bottom end of the detection rod (84), a spring (88) is arranged between the bottom of the baffle (87) and the bottom end surface of the detection cavity (81), a displacement sensor (89) is fixedly provided on the side of the baffle (87), and a receiver (90) adapted to the displacement sensor (89) is fixedly provided inside the detection cavity (81) at the side of the detection rod (84).

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