A new energy vehicle asynchronous motor cast aluminum rotor production line with automatic shaft loading

Abstract

The application discloses a new energy vehicle asynchronous motor cast aluminum rotor production line with automatic shaft mounting, which comprises a rotor core punching area, a rotor core degreasing area, a rotor core cast aluminum area, a cast aluminum rotor inner hole reaming area and a cast aluminum rotor automatic shaft mounting area arranged in sequence according to the production process of the cast aluminum rotor; a cast aluminum rotor feeding station, a shaft feeding station, a cast aluminum rotor heating station, an automatic shaft mounting station and a shaft mounting manipulator are arranged on the cast aluminum rotor automatic shaft mounting area, and the cast aluminum rotor feeding station, the shaft feeding station, the cast aluminum rotor heating station and the automatic shaft mounting station are arranged at intervals in the circumferential direction around the periphery of the shaft mounting manipulator; a cast aluminum rotor reaming device is arranged on the cast aluminum rotor inner hole reaming area; and an automatic shaft mounting mechanism for mounting a rotating shaft into the inner hole of the cast aluminum rotor is arranged on the automatic shaft mounting station. The application improves the production efficiency and production quality of the cast aluminum rotor and reduces the labor production cost.

Description

Technical Field

[0001] This invention relates to the field of motor core manufacturing equipment technology, specifically to an automatic shaft-loading production line for cast aluminum rotors of asynchronous motors for new energy vehicles. Background Technology

[0002] The rotor of an asynchronous motor for new energy vehicles is a cast aluminum rotor formed by high-pressure casting of a rotor core. The production process of the cast aluminum rotor mainly includes stamping silicon steel sheets into core laminations using a progressive die and stacking them into the rotor core; degreasing the rotor core; casting the rotor core into aluminum; machining the inner hole of the cast aluminum rotor; assembling the cast aluminum rotor with the shaft; and dynamic balancing after assembly. The process is complex, requires high quality control, and key processes such as shaft assembly require manual operation, resulting in low production efficiency, significant quality control challenges, and high labor costs.

[0003] Therefore, it is necessary to solve the above problems through technological improvements in order to meet the needs of mass production of cast aluminum rotors. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes an automated shaft-loading production line for cast aluminum rotors of asynchronous motors in new energy vehicles, aiming to improve the production efficiency and quality of cast aluminum rotors while reducing labor costs. The specific technical solution is as follows:

[0005] An automated shaft-assembly production line for cast aluminum rotors of asynchronous motors in new energy vehicles includes a rotor core stamping area, a rotor core degreasing area, a rotor core aluminum casting area, a cast aluminum rotor inner hole reaming area, and an automated shaft-assembly area for cast aluminum rotors, arranged sequentially according to the production process of the cast aluminum rotor. The automated shaft-assembly area is equipped with a cast aluminum rotor loading station, a shaft loading station, a cast aluminum rotor heating station, an automated shaft-assembly station, and a shaft-assembly robot. These stations are spaced circumferentially around the periphery of the shaft-assembly robot. The rotor core stamping area is equipped with a core stamping progressive die; the rotor core degreasing area is equipped with a core drying and degreasing device; the rotor core aluminum casting area is equipped with a rotor core die casting machine; and the aluminum rotor inner hole reaming area is equipped with an aluminum rotor reaming device. The aluminum rotor loading station is equipped with an aluminum rotor storage bin for storing aluminum rotors; the shaft loading station is equipped with a shaft storage bin for storing shafts; the aluminum rotor heating station is equipped with a core heating device; and the automatic shaft mounting station is equipped with an automatic shaft mounting mechanism for installing shafts into the inner hole of the aluminum rotor.

[0006] Preferably, the new energy vehicle asynchronous motor cast aluminum rotor production line of the present invention further includes a cast aluminum rotor cooling zone set after the cast aluminum rotor automatic shaft mounting area according to the cast aluminum rotor production process for cooling the cast aluminum rotor after shaft mounting, and the cast aluminum rotor cooling zone is provided with an air cooling device.

[0007] Preferably, the air-cooling device of the cast aluminum rotor cooling zone is located near the shaft-mounting robot.

[0008] Preferably, a rotor conveyor line for transferring the rotor core or the cast aluminum rotor is provided between the rotor core stamping area, the rotor core degreasing area, the rotor core aluminum casting area, the cast aluminum rotor inner hole reaming area, the cast aluminum rotor automatic shaft mounting area, and the cast aluminum rotor cooling area, and a rotor transfer mechanism is provided between the rotor conveyor line and the rotor core stamping area, rotor core degreasing area, rotor core aluminum casting area, cast aluminum rotor inner hole reaming area, cast aluminum rotor automatic shaft mounting area, and cast aluminum rotor cooling area.

[0009] Preferably, the rotor transfer mechanism is a transfer robot.

[0010] In this invention, the automatic shaft mounting mechanism includes a press that is matched with the shaft mounting robot, and a rotor positioning mold that is set on the press worktable for positioning the cast aluminum rotor. The rotor positioning mold includes a vertical frame, a lifter set at the lower part of the vertical frame, a hydrostatic expansion mandrel that is erected at the upper part of the lifter and extends upward to the upper part of the vertical frame for positioning the inner hole of the cast aluminum rotor, and a plurality of floating support cylinders that are set at the upper part of the vertical frame and located around the hydrostatic expansion mandrel for positioning the lower end face of the cast aluminum rotor.

[0011] Preferably, the lifting device is a servo electric cylinder, and the lower end of the hydrostatic expansion mandrel is fixed to the connecting flange at the top of the telescopic rod of the servo electric cylinder.

[0012] Preferably, the hydrostatic expansion mandrel is a liquid plastic hydrostatic expansion mandrel, which includes a mandrel body, an expansion sleeve fitted on the outer circle of the mandrel body by an interference fit, annular grooves respectively disposed at both ends of the inner hole of the expansion sleeve, a liquid plastic filling channel disposed inside the mandrel body and connected to the annular groove on the outer circle of the mandrel body, a liquid plastic extrusion hole opened on the mandrel body and connected to the liquid plastic filling channel, and a liquid plastic pressure cylinder fixed on the mandrel body with its piston rod inserted into the liquid plastic extrusion hole; a thin wall is formed between the bottom of the annular groove and the outer circle of the expansion sleeve, and the annular groove, the liquid plastic filling channel and the liquid plastic extrusion hole are filled with liquid plastic.

[0013] Preferably, the liquid plastic filling channel is formed by drilling. The liquid plastic filling channel includes an axial liquid plastic filling channel formed by drilling and a transverse liquid plastic filling channel that connects the annular groove to the axial liquid plastic filling channel through drilling. The borehole opening of the axial liquid plastic filling channel is sealed by welding a sealing plate.

[0014] Preferably, the liquid plastic extrusion hole is a transverse liquid plastic extrusion hole formed by drilling, and the liquid plastic top pressure cylinder is installed at the opening of the transverse liquid plastic extrusion hole, with the piston rod of the liquid plastic top pressure cylinder inserted into the transverse liquid plastic extrusion hole.

[0015] As a further improvement of the present invention, a central guide hole is provided axially at the upper center position of the mandrel body. A floating ejector pin is provided in the central guide hole by means of a spring to elastically press against the lower center hole of the rotating shaft during assembly to achieve alignment.

[0016] Preferably, the upper press head of the press is equipped with a fixed ejector pin for pressing against the center hole at the upper end of the rotating shaft; the floating ejector pin and the fixed ejector pin are coaxial with each other.

[0017] Preferably, a limiting groove is provided on one side of the floating ejector pin, and a limiting pin is provided on the spindle body to limit the up and down stroke of the floating ejector pin, with the front end of the limiting pin entering the limiting groove.

[0018] Preferably, the upper end face of the mandrel body is provided with a sensor mounting hole, and a distance measuring sensor is provided in the sensor mounting hole for dynamically monitoring the height position of the lower end face of the upper shaft during shaft assembly.

[0019] A wiring hole is provided inside the mandrel body, and the sensor signal line of the ranging sensor passes through the wiring hole downward and is led out from the lower part of the mandrel body.

[0020] Preferably, the upper end face of the vertical frame is provided with a sensor mounting hole, and a distance measuring sensor for detecting the height position of the lower end face of the cast aluminum rotor is provided in the sensor mounting hole.

[0021] Preferably, the lower housing of the servo electric cylinder is provided with a distance sensor for detecting the height position of the top of the telescopic rod of the servo electric cylinder.

[0022] By setting distance sensors on the upper end face of the spindle, the upper end face of the vertical frame, and the lower housing of the servo cylinder, and coordinating them with the lifting distance of the servo cylinder, the pressing depth of the shaft into the inner hole of the cast aluminum rotor can be accurately controlled, thereby achieving precise axial assembly of the shaft and the cast aluminum rotor.

[0023] Preferably, the ranging sensor is an infrared ranging sensor.

[0024] In this invention, the shaft-mounting robot arm is equipped with a shaft clamp for clamping the outer circle of the cast aluminum rotor and the outer circle of the shaft; the shaft clamp includes a finger cylinder disposed at the front end of the shaft-mounting robot arm, a pair of clamping blocks disposed on the finger cylinder respectively and capable of clamping each other, and a pair of clamping fingers disposed on each clamping block, wherein the clamping fingers are provided with V-shaped grooves for positioning and clamping the outer circle of the cast aluminum rotor or the shaft.

[0025] In this invention, the iron core heating device is a magnetic induction rapid heating device.

[0026] In this invention, the press, lifting device, floating support cylinder, liquid plastic top-pressure cylinder, shaft-assembly robot, and distance sensor are respectively connected to the control system. The control system coordinates the actions of the press, lifting device, floating support cylinder, liquid plastic top-pressure cylinder, and shaft-assembly robot to achieve automatic assembly of the shaft and the cast aluminum rotor. The main process of automatic shaft assembly is as follows:

[0027] (1) Core heating: The spindle assembly robot moves to the aluminum cast rotor storage bin, grabs the aluminum cast rotor from the storage bin, and then transfers it to the aluminum cast rotor heating station to achieve rapid magnetic induction heating of the aluminum cast rotor.

[0028] (2) Positioning of cast aluminum rotor: After heating, the cast aluminum rotor is transferred by the shaft mounting robot to the press of the automatic shaft mounting station, and the cast aluminum rotor is fitted onto the outer circle of the expansion sleeve of the hydrostatic expansion mandrel; after it is in place, the liquid plastic top pressure cylinder is opened, so that the expansion sleeve of the hydrostatic expansion mandrel is squeezed by the internal liquid plastic and deformed outward. The thin walls on the upper and lower parts of the expansion sleeve clamp the inner hole of the cast aluminum rotor to achieve self-centering. After it is in place, the floating support cylinder is opened to float and support the lower end face of the cast aluminum rotor; the control system obtains the height position data of the lower end face of the cast aluminum rotor through the distance sensor located on the upper end face of the vertical frame.

[0029] (3) Shaft positioning: The shaft mounting robot moves to the shaft storage bin, grabs the shaft in the shaft storage bin, and transfers it to the press at the automatic shaft mounting station. The lower center hole of the shaft is positioned on the floating ejector pin at the upper end of the hydrostatic expansion mandrel to achieve the lower center positioning of the shaft. After it is in place, the press is turned on, so that the upper press head of the press moves down a set distance, which drives the fixed ejector pin installed on it to move down synchronously until the fixed ejector pin hits the upper center hole of the shaft to achieve the upper center positioning of the shaft. After it is in place, the shaft mounting robot is released, and the control system obtains the height position data of the lower end face of the shaft through the distance sensor located on the end face of the mandrel body of the hydrostatic expansion mandrel.

[0030] (4) Assembly of the shaft and the cast aluminum rotor: Loosen the liquid plastic top pressure cylinder to allow the outer circle of the expansion sleeve of the hydrostatic expansion mandrel to retract and reset, thereby forming a sliding fit between the inner hole of the cast aluminum rotor and the outer circle of the expansion sleeve. Start the press to continue moving downward, and at the same time start the servo electric cylinder to move downward synchronously. Under the guidance of the upper fixed ejector pin and the lower floating ejector pin, the shaft is gradually pressed into the inner hole of the cast aluminum rotor. The control system obtains the height position data of the lower end face of the cast aluminum rotor based on the distance sensor located on the upper end face of the vertical frame and the distance sensor located on the hydrostatic expansion mandrel. The height position data of the lower end face of the rotating shaft obtained by the distance measuring sensor on the end face of the mandrel body and the height position data of the top of the telescopic rod of the servo electric cylinder obtained by the distance measuring sensor on the lower housing seat of the servo electric cylinder are used to calculate and precisely control the pressing depth of the rotating shaft into the inner hole of the cast aluminum rotor; after reaching the position, the press is turned on to rise and reset to the original position, so that the upper fixed ejector pin is disengaged from the rotating shaft, and the servo electric cylinder is turned on to continue to move down, so that the lower floating ejector pin is disengaged from the rotating shaft; the assembly operation of the rotating shaft and the cast aluminum rotor is completed.

[0031] (5) Servo electric cylinder reset: The shaft assembly robot takes away the assembly of the cast aluminum rotor and the shaft and transfers it to the air-cooling device in the cooling area of ​​the cast aluminum rotor for air cooling; at the same time, the servo electric cylinder resets and rises to the predetermined position to prepare for the next shaft assembly operation of the cast aluminum rotor.

[0032] Preferably, the automatic shaft-loading production line for cast aluminum rotors of asynchronous motors for new energy vehicles according to the present invention further includes a dynamic balancing zone and a cleaning zone, which are sequentially arranged after the cooling zone of the cast aluminum rotor according to the production process of the cast aluminum rotor. The dynamic balancing zone is equipped with a dynamic balancing machine, and the cleaning zone is equipped with a cyclone cleaning device.

[0033] In this invention, the cast aluminum rotor reaming device includes a base, a slide table movable on the base in the left-right direction, a pair of columns erected on the front and rear sides of the upper surface of the slide table, a bridge plate connecting the tops of the pair of columns, a top pressure cylinder mounted on the bridge plate with its piston rod facing downwards, a pressure block disposed at the lower end of the piston rod of the top pressure cylinder, a pair of cylindrical positioning rods parallel to the left-right direction spaced apart on the upper surface of the slide table below the pressure block, a rotating shaft for mounting the reamer rotatably disposed on one side of the base in the left-right direction, and a linear actuator for driving the slide table to move in the left-right direction is also disposed on the base.

[0034] In this invention, the slide is movably mounted on a pair of cylindrical guide rails, and each end of the cylindrical guide rails is connected to a support, which is fixedly connected to the base.

[0035] Preferably, the linear actuator is a servo electric linear actuator.

[0036] Preferably, a pair of guide rods are vertically arranged on the upper end face of the pressure block, and a pair of guide holes are correspondingly arranged on the bridge plate, with the pair of guide rods slidably arranged in the pair of guide holes.

[0037] By installing guide rods on the pressure block, the reliability of part clamping is improved when the piston rod stroke of the top pressure cylinder is long.

[0038] In this invention, a reduction gearbox is provided on one side of the base in the left-right direction, and the rotating shaft is the output shaft of the reduction gearbox.

[0039] In this invention, the reduction gearbox is equipped with a drive motor for driving the rotating shaft to rotate.

[0040] Preferably, the slide is provided with a lifting adjustment seat, the pair of columns are erected on the lifting adjustment seat on the slide, and the pair of cylindrical positioning rods are fixed on the lifting adjustment seat.

[0041] Preferably, a connecting plate is connected between the two ends of the pair of cylindrical positioning rods.

[0042] Preferably, the lower end face of the pressure block is provided with a V-shaped groove for pressing the outer circle of the cast aluminum rotor.

[0043] Preferably, the lower end face of the pressure block is provided with a bakelite insert, and the V-groove is provided on the bakelite insert.

[0044] As a further improvement to the aluminum rotor boring device of the present invention, a blower for cleaning the aluminum rotor after boring is also provided on the other side of the base in the left-right direction; the blower includes a blower seat fixed on the base and a blower pipe fixed on the blower seat and connected to a compressed air pipeline. A sealing plate is provided at the front end of the blower pipe and a plurality of blower holes connected to the inner hole of the blower pipe are provided on the outer circle of the front end of the blower pipe, so that the outer circle of the front end of the blower pipe forms a blower head for blowing the inner hole of the aluminum rotor; the blower pipe is coaxially arranged with the rotating shaft and is placed on the left and right sides of the slide.

[0045] By setting up a blower, the inner hole of a part can be automatically blown and cleaned after reaming, which has high cleaning efficiency and good cleaning quality.

[0046] The outer diameter of the blow head is smaller than the inner diameter of the cast aluminum rotor.

[0047] Preferably, the purge holes are evenly spaced on the outer circumference of the front end section of the purge tube.

[0048] The outer diameter of the blow head is smaller than the inner diameter of the cast aluminum rotor.

[0049] In this invention, a push rod connecting block is provided at the lower end of the slide table, and the front end of the telescopic rod of the servo electric push rod is fixed on the push rod connecting block.

[0050] As a further improvement of the present invention, a center height corrector is also provided on the purger for correcting the center height position of the inner hole of the cast aluminum rotor before reaming. The center height corrector includes an upper pipe joint sealed and welded to the upper part of the inner wall of a section of the front end of the purge pipe, and a lower pipe joint sealed and welded to the lower part of the inner wall of a section of the front end of the purge pipe. An upper airflow detection hole connected to the upper pipe joint is also provided at the upper part of the outer circle of a section of the front end of the purge pipe, and a lower airflow detection hole connected to the lower pipe joint is also provided at the lower part of the outer circle of a section of the front end of the purge pipe. The upper pipe joint and the lower pipe joint are respectively connected to an upper airflow delivery pipe and a lower airflow delivery pipe. The upper airflow delivery pipe and the lower airflow delivery pipe are connected to a pneumatic gauge through a three-way switching valve.

[0051] In this invention, an electrically controlled valve is installed on the compressed air pipeline.

[0052] In this invention, the top pressure cylinder, linear actuator (servo electric push rod), drive motor, electric control valve, three-way switching valve and pneumatic gauge are automatically controlled by the controller.

[0053] The method of using this invention is as follows:

[0054] (1) Workpiece installation: Position the outer circle of the cast aluminum rotor onto a pair of cylindrical positioning rods, and then drive the top pressure cylinder to move so that the pressure block at the lower end of the piston rod of the top pressure cylinder presses and fixes the cast aluminum rotor.

[0055] (2) Center height adjustment: Drive the linear actuator (servo electric push rod) to move the slide table toward the blow head side, and the blow head enters the inner hole of the cast aluminum rotor; connect the compressed air pipeline and spray compressed air through the blow hole on the blow head to pre-clean the inner hole of the cast aluminum rotor; after pre-cleaning, close the compressed air pipeline and then connect the pneumatic gauge. By switching the three-way switching valve, detect the air flow of the upper air flow detection hole and the lower air flow detection hole respectively, and compare the air flow of the upper air flow detection hole and the lower air flow detection hole. Adjust the upper and lower height positions of the cast aluminum rotor by adjusting the lifting adjustment seat so that the air flow of the upper air flow detection hole and the lower air flow detection hole are equal.

[0056] (3) Reaming: Turn on the drive motor to drive the output shaft (rotary shaft) of the gearbox to rotate together with the reamer; drive the linear actuator (servo electric push rod) to move the slide table to the side of the reamer, and the reamer enters the inner hole of the cast aluminum rotor to ream; after reaming to the limit position, drive the linear actuator (servo electric push rod) to move the slide table back to the middle initial position, the cast aluminum rotor separates from the reamer, and the reaming operation is completed;

[0057] (4) Cleaning: Drive the linear actuator (servo electric push rod) to move the slide table toward the blow head, and the blow head enters the inner hole of the cast aluminum rotor; connect the compressed air pipeline and spray compressed air through the blow hole on the blow head to clean the inner hole of the cast aluminum rotor; after cleaning, drive the linear actuator (servo electric push rod) to move the slide table back to the initial middle position, and the cleaning operation of the inner hole of the cast aluminum rotor is completed.

[0058] (5) Removal: Turn off the drive motor so that the output shaft (rotating shaft) of the gearbox and the reamer stop rotating; drive the top pressure cylinder to move, so that the piston rod of the top pressure cylinder retracts, and the pressure block at the lower end of the piston rod of the top pressure cylinder releases the cast aluminum rotor, and the operator removes the cast aluminum rotor.

[0059] (6) Cyclic operation: Repeat steps (1) to (4) to complete the reaming operation of the next cast aluminum rotor.

[0060] In step (2), during pre-cleaning, the linear actuator (servo electric push rod) is driven to move, causing the slide to move back and forth, thereby achieving reciprocating pre-cleaning;

[0061] Preferably, in step (4) cleaning, the linear actuator (servo electric push rod) drives the slide to move back and forth several times to further improve the cleaning effect of the inner hole of the cast aluminum rotor.

[0062] The beneficial effects of this invention are:

[0063] First, the present invention provides an automatic shaft-mounting production line for cast aluminum rotors of asynchronous motors for new energy vehicles. The automatic shaft-mounting area of ​​the cast aluminum rotor is equipped with an automatic shaft-mounting mechanism, which can realize the automatic assembly of the cast aluminum rotor and the shaft. It has a high degree of automation, high production efficiency, and saves labor production costs.

[0064] Secondly, the automatic shaft mounting production line for cast aluminum rotors of asynchronous motors for new energy vehicles of the present invention adopts adaptive positioning based on hydrostatic expansion mandrel as the main positioning and floating support cylinder as the main positioning, which has good positioning reliability and high accuracy.

[0065] Third, the automatic shaft mounting production line for cast aluminum rotors of asynchronous motors for new energy vehicles of the present invention utilizes the advantage that the center holes at both ends of the shaft are coaxial with the outer circle of the shaft. During assembly, the upper fixed ejector pin and the lower floating ejector pin of the automatic shaft mounting mechanism move down synchronously, realizing high-precision dynamic guidance during assembly. This can effectively prevent the shaft from jamming due to inaccurate positioning or displacement during the pressing process of the shaft in conventional assembly operations, thereby improving the assembly quality of the cast aluminum rotor and the shaft.

[0066] Fourth, the present invention provides an automatic shaft mounting production line for cast aluminum rotors of asynchronous motors for new energy vehicles. The cast aluminum rotor inner hole reaming area is equipped with a cast aluminum rotor reaming device. During the reaming operation, the operator only needs to be responsible for the picking and placing of parts (cast aluminum rotors). Apart from the picking and placing of parts, the reaming operation can be completed automatically, thereby improving the efficiency of the reaming operation and reducing the labor intensity of the operator.

[0067] Fifth, the present invention provides an automatic shaft mounting production line for cast aluminum rotors of asynchronous motors for new energy vehicles. The cast aluminum rotor reaming device, by setting a lifting adjustment seat on the slide, can adapt to the clamping and positioning of cast aluminum rotors of different diameters, and has good versatility. The use of a pair of cylindrical positioning rods for positioning can achieve automatic centering, and its positioning accuracy is good.

[0068] Sixth, the present invention provides an automatic shaft-mounting production line for cast aluminum rotors of asynchronous motors for new energy vehicles. The blower of the cast aluminum rotor reaming device is equipped with a center height adjuster, which can detect whether the gap between the outer circle of the blower head and the inner hole of the cast aluminum rotor is uniform in the vertical direction. Thus, under the control of the controller, the center height of the inner hole of the cast aluminum rotor can be automatically and accurately adjusted to compensate for the vertical offset error of the inner hole after positioning caused by the change of the outer diameter tolerance of the cast aluminum rotor. This ensures that the reamer axis is consistent with the inner hole of the cast aluminum rotor, thereby further improving the quality of reaming of the cast aluminum rotor. Attached Figure Description

[0069] Figure 1 This is a schematic diagram of the overall layout of an automatic shaft-loading production line for cast aluminum rotors of asynchronous motors for new energy vehicles according to the present invention.

[0070] Figure 2 yes Figure 1 A schematic diagram of the automatic shaft mounting mechanism in the diagram;

[0071] Figure 3 yes Figure 2 A magnified view of a portion of the document;

[0072] Figure 4 yes Figure 3 A magnified view of a portion of the document;

[0073] Figure 5 yes Figure 2A schematic diagram of the structure of the finger cylinder in the image;

[0074] Figure 6 yes Figure 5 Top view;

[0075] Figure 7 This is a schematic diagram of the structure of a cast aluminum rotor boring device according to the present invention;

[0076] Figure 8 yes Figure 7 K-direction view;

[0077] Figure 9 yes Figure 7 The image shows a magnified view of a portion of the purge head.

[0078] In the diagram: 41. Press, 42. Press worktable, 43. Rotor positioning mold, 44. Vertical frame, 45. Lifter (servo electric cylinder), 46. Static pressure expansion mandrel, 47. Floating support cylinder, 48. Mandrel body, 49. Expansion sleeve, 50. Annular groove, 51. Thin wall, 52. Liquid plastic filling channel, 53. Liquid plastic extrusion hole, 54. Liquid plastic top pressure cylinder, 55. Liquid plastic, 56. Center guide hole, 57. Spring, 58. Shaft, 59. Lower center hole of shaft, 60. Floating ejector pin, 61. Shaft clamp, 62. Shaft mounting robot, 63. Distance sensor, 64. Sensor signal line, 65. Limit groove, 66. Limit pin, 67. Finger cylinder, 68. Clamping block, 69. Finger clamp, 70. V-groove, 71. Fixed ejector pin.

[0079] In the diagram: 1. Base, 2. Slide table, 3. Column, 4. Bridge plate, 5. Top pressure cylinder, 6. Cylindrical guide rail, 7. Pressure block, 8. Cylindrical positioning rod, 9. Reamer, 10. Rotary shaft, 11. Linear actuator (servo electric actuator), 12. Guide rod, 13. Support, 14. Gearbox, 15. Drive motor, 16. Lifting adjustment seat, 17. Connecting plate, 18. V-groove, 19. Bakelite inlay, 20. Blower, 21. 21. Purge seat; 22. Compressed air pipeline; 23. Purge pipe; 24. Purge head; 25. Purge hole; 26. Push rod connecting block; 27. Cast aluminum rotor; 28. Sealing plate; 29. ​​Center height corrector; 30. Upper pipe joint; 31. Lower pipe joint; 32. Upper airflow detection hole; 33. Lower airflow detection hole; 34. Upper airflow delivery pipe; 35. Lower airflow delivery pipe; 36. Three-way switching valve; 37. Pneumatic gauge. Detailed Implementation

[0080] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0081] like Figures 1 to 9 The diagram illustrates an embodiment of an automated shaft-assembly production line for cast aluminum rotors of asynchronous motors for new energy vehicles, comprising a rotor core stamping area, a rotor core degreasing area, a rotor core aluminum casting area, a cast aluminum rotor inner hole reaming area, and an automated shaft-assembly area for cast aluminum rotors, arranged sequentially according to the production process of the cast aluminum rotor. The automated shaft-assembly area includes a cast aluminum rotor loading station, a shaft loading station, a cast aluminum rotor heating station, an automated shaft-assembly station, and a shaft-assembly robot 62. These stations are arranged circumferentially around the periphery of the shaft-assembly robot. The rotor core stamping area is equipped with a core stamping progressive die; the rotor core degreasing area is equipped with a core drying and degreasing device; the rotor core aluminum casting area is equipped with a rotor core die casting machine; and the aluminum rotor inner hole reaming area is equipped with an aluminum rotor reaming device. The aluminum rotor loading station is equipped with an aluminum rotor storage bin for storing aluminum rotors; the shaft loading station is equipped with a shaft storage bin for storing shafts; the aluminum rotor heating station is equipped with a core heating device; and the automatic shaft mounting station is equipped with an automatic shaft mounting mechanism for installing shafts into the inner hole of the aluminum rotor.

[0082] Preferably, the automatic shaft-loading production line for cast aluminum rotors of new energy vehicle asynchronous motors in this embodiment further includes a cast aluminum rotor cooling zone set after the automatic shaft-loading area of ​​the cast aluminum rotor according to the production process of the cast aluminum rotor, which is used to cool the cast aluminum rotor after shaft loading. The cast aluminum rotor cooling zone is equipped with an air cooling device.

[0083] Preferably, the air-cooling device of the cast aluminum rotor cooling zone is located near the shaft-mounting robot 62.

[0084] Preferably, a rotor conveyor line for transferring the rotor core or the cast aluminum rotor is provided between the rotor core stamping area, the rotor core degreasing area, the rotor core aluminum casting area, the cast aluminum rotor inner hole reaming area, the cast aluminum rotor automatic shaft mounting area, and the cast aluminum rotor cooling area, and a rotor transfer mechanism is provided between the rotor conveyor line and the rotor core stamping area, rotor core degreasing area, rotor core aluminum casting area, cast aluminum rotor inner hole reaming area, cast aluminum rotor automatic shaft mounting area, and cast aluminum rotor cooling area.

[0085] Preferably, the rotor transfer mechanism is a transfer robot.

[0086] In this embodiment, the automatic shaft mounting mechanism includes a press 41 that is matched with the shaft mounting robot 62, and a rotor positioning mold 43 that is set on the press workbench 42 for positioning the cast aluminum rotor 27. The rotor positioning mold 43 includes a vertical frame 44, a lifter 45 set at the lower part of the vertical frame 44, a hydrostatic expansion mandrel 46 that is erected at the upper part of the lifter 45 and extends upward to the upper part of the vertical frame 44 for positioning the inner hole of the cast aluminum rotor 27, and a plurality of floating support cylinders 47 that are set at the upper part of the vertical frame 44 and located around the hydrostatic expansion mandrel 46 for positioning the lower end face of the cast aluminum rotor 27.

[0087] Preferably, the lifting device 45 is a servo electric cylinder, and the lower end of the hydrostatic expansion mandrel 46 is fixed to the connecting flange at the top of the telescopic rod of the servo electric cylinder.

[0088] Preferably, the hydrostatic expansion mandrel 46 is a liquid plastic hydrostatic expansion mandrel, which includes a mandrel body 48, an expansion sleeve 49 fitted onto the outer circle of the mandrel body 48 by an interference fit, annular grooves 50 respectively disposed at both ends of the inner hole of the expansion sleeve 49, a liquid plastic filling channel 52 disposed inside the mandrel body 48 and communicating with the annular groove 50 on the outer circle of the mandrel body 48, a liquid plastic extrusion hole 53 opened on the mandrel body 48 and communicating with the liquid plastic filling channel 52, and a liquid plastic pressure cylinder 54 fixed on the mandrel body 48 with its piston rod inserted into the liquid plastic extrusion hole 53; a thin wall is formed between the bottom of the annular groove 50 and the outer circle of the expansion sleeve 49, and the annular groove 50, the liquid plastic filling channel 52 and the liquid plastic extrusion hole 53 are filled with liquid plastic 55.

[0089] Preferably, the liquid plastic filling channel 52 is formed by drilling. The liquid plastic filling channel 52 includes an axial liquid plastic filling channel formed by drilling and a transverse liquid plastic filling channel that connects the annular groove 50 to the axial liquid plastic filling channel by drilling. The borehole opening of the axial liquid plastic filling channel is sealed by welding a sealing plate.

[0090] Preferably, the liquid plastic extrusion hole 53 is a transverse liquid plastic extrusion hole formed by drilling, and the liquid plastic top pressure cylinder 54 is installed at the opening of the transverse liquid plastic extrusion hole, with the piston rod of the liquid plastic top pressure cylinder 54 inserted into the transverse liquid plastic extrusion hole.

[0091] As a further improvement of this embodiment, a central guide hole 56 is also provided axially at the upper center position of the mandrel body 48. A floating ejector pin 60 is floatingly disposed in the central guide hole 56 by a spring 57 to elastically press against the lower center hole 59 of the rotating shaft 58 during assembly to achieve assembly alignment.

[0092] Preferably, the upper end of the press 41 is equipped with a fixed ejector pin 71 for pressing against the upper center hole of the rotating shaft 58; the floating ejector pin 60 and the fixed ejector pin 71 are coaxial with each other.

[0093] Preferably, a limiting groove 65 is provided on one side of the floating ejector pin 60, and a limiting pin 66 is provided on the spindle body 48 to limit the up and down travel of the floating ejector pin 60, with the front end of the limiting pin 66 entering the limiting groove 65.

[0094] Preferably, the upper end face of the spindle body 48 is provided with a sensor mounting hole, and a distance measuring sensor 63 is provided in the sensor mounting hole for dynamically monitoring the height position of the lower end face of the upper spindle 58 during assembly.

[0095] A wiring hole is provided inside the spindle body 48, and the sensor signal line 64 of the ranging sensor 63 passes through the wiring hole and is led out from the lower part of the spindle body 48.

[0096] Preferably, the upper end face of the vertical frame 44 is provided with a sensor mounting hole, and a distance measuring sensor 63 for detecting the height position of the lower end face of the cast aluminum rotor 27 is provided in the sensor mounting hole.

[0097] Preferably, a distance sensor 63 for detecting the height position of the top of the telescopic rod of the servo cylinder is provided on the lower housing seat of the servo cylinder 45.

[0098] By setting distance sensors 63 on the upper end face of the spindle body 48, the upper end face of the vertical frame 44, and the lower housing seat of the servo electric cylinder 45, and coordinating with the lifting distance of the servo electric cylinder, the pressing depth of the rotating shaft 58 into the inner hole of the cast aluminum rotor 27 can be accurately controlled, thereby achieving axial precision assembly of the rotating shaft 58 and the cast aluminum rotor 27.

[0099] Preferably, the ranging sensor 63 is an infrared ranging sensor.

[0100] In this embodiment, the shaft-mounting robot 62 is provided with a shaft clamping device 61 for clamping the outer circle of the cast aluminum rotor 27 and the outer circle of the shaft 58; the shaft clamping device 61 includes a finger cylinder 67 disposed at the front end of the shaft-mounting robot 62, a pair of clamping blocks 68 respectively disposed on the finger cylinder 67 and capable of clamping each other, and a pair of clamping fingers 69 disposed on each clamping block 68, wherein the clamping fingers 69 are provided with V-grooves 70 for positioning and clamping the outer circle of the cast aluminum rotor 27 or the shaft 58.

[0101] In this embodiment, the iron core heating device is a magnetic induction rapid heating device.

[0102] In this embodiment, the press 41, lifting device 45, floating support cylinder 47, liquid plastic top-pressing cylinder 54, shaft-assembly robot 62, and distance sensor 63 are respectively connected to the control system. The control system coordinates the movements of the press 41, lifting device 45, floating support cylinder 47, liquid plastic top-pressing cylinder 54, and shaft-assembly robot 62 to achieve automatic assembly of the rotating shaft 58 and the cast aluminum rotor 27. The main process of automatic shaft assembly is as follows:

[0103] (1) Core heating: The shaft loading robot 62 moves to the aluminum casting rotor storage bin, grabs the aluminum casting rotor from the storage bin, and then transfers it to the aluminum casting rotor heating station to achieve rapid magnetic induction heating of the aluminum casting rotor 27.

[0104] (2) Positioning of cast aluminum rotor: After heating, the cast aluminum rotor 27 is transferred by the shaft mounting robot 62 to the press 41 of the automatic shaft mounting station, and the cast aluminum rotor 27 is fitted onto the outer circle of the expansion sleeve 49 of the hydrostatic expansion mandrel 46; after it is in place, the liquid plastic pressing cylinder 54 is opened, so that the expansion sleeve 49 of the hydrostatic expansion mandrel 46 is squeezed by the internal liquid plastic and deformed outward. The thin wall 51 on the expansion sleeve 49 at the upper and lower positions clamps the inner hole of the cast aluminum rotor 27 to achieve self-centering. After it is in place, the floating support cylinder 47 is opened to float and support the lower end face of the cast aluminum rotor 27; the control system obtains the height position data of the lower end face of the cast aluminum rotor 27 through the distance sensor 63 located on the upper end face of the vertical frame 44.

[0105] (3) Shaft positioning: The shaft mounting robot 62 moves to the shaft storage bin, grabs the shaft 58 on the shaft storage bin, and transfers it to the press 41 at the automatic shaft mounting station. The lower center hole 59 of the shaft is positioned on the floating ejector pin 60 at the upper end of the hydrostatic expansion mandrel 46 to achieve the lower center positioning of the shaft. After it is in place, the press 41 is turned on, so that the upper end of the press head of the press 41 moves down a set distance, which drives the fixed ejector pin 71 installed on it to move down synchronously until the fixed ejector pin 71 presses against the upper center hole of the shaft 58 to achieve the upper center positioning of the shaft 58. After it is in place, the shaft mounting robot 62 is released, and the control system obtains the height position data of the lower end face of the shaft 58 through the distance sensor 63 located on the end face of the mandrel body 48 of the hydrostatic expansion mandrel 46.

[0106] (4) Assembly of the shaft and the cast aluminum rotor: Loosen the liquid plastic top pressure cylinder 54 to allow the outer circle of the expansion sleeve 49 of the hydrostatic expansion mandrel 46 to shrink and reset, thereby forming a sliding fit between the inner hole of the cast aluminum rotor 27 and the outer circle of the expansion sleeve 49. Start the press 41 to continue moving downward, and at the same time start the servo electric cylinder 45 to move downward synchronously. Under the guidance of the upper fixed ejector pin 71 and the lower floating ejector pin 60, the shaft 58 is gradually pressed into the inner hole of the cast aluminum rotor 27. The control system obtains the height position data of the lower end face of the cast aluminum rotor 27 based on the distance sensor 63 located on the upper end face of the vertical frame 44 and the distance sensor 63 located on the hydrostatic expansion mandrel 46. The height position data of the lower end face of the rotating shaft 58 obtained by the distance sensor 53 on the end face of the spindle body 48 of 46 and the height position data of the top of the telescopic rod of the servo electric cylinder 45 obtained by the distance sensor 63 on the lower housing seat of the servo electric cylinder 45 are used to calculate and precisely control the pressing depth of the rotating shaft 58 into the inner hole of the cast aluminum rotor 27; after reaching the position, the press 41 is turned on to rise and reset to the original position, so that the upper fixed ejector pin 71 is disengaged from the rotating shaft 58, and the servo electric cylinder 45 is turned on to continue to move down, so that the lower floating ejector pin 60 is disengaged from the rotating shaft 58; the assembly operation of the rotating shaft 58 and the cast aluminum rotor 27 is completed;

[0107] (5) Servo cylinder reset: The shaft assembly robot 62 takes away the assembly of the cast aluminum rotor 27 and the shaft 58 and transfers it to the air-cooling device in the cooling area of ​​the cast aluminum rotor for air cooling; at the same time, the servo cylinder 45 resets and rises to the predetermined position to prepare for the next assembly operation of the shaft 58 of the cast aluminum rotor 27.

[0108] Preferably, the automatic shaft-mounting production line for cast aluminum rotors of asynchronous motors for new energy vehicles in this embodiment further includes a dynamic balancing zone and a cleaning zone, which are sequentially arranged after the cooling zone of the cast aluminum rotor according to the production process of the cast aluminum rotor. The dynamic balancing zone is equipped with a dynamic balancing machine, and the cleaning zone is equipped with a cyclone cleaning device.

[0109] In this embodiment, the cast aluminum rotor reaming device includes a base 1, a slide 2 that is movable in the left-right direction on the base 1, a pair of columns 3 that are erected on the front and rear sides of the upper end face of the slide 2, a bridge plate 4 connecting the tops of the pair of columns 3, a top pressure cylinder 5 mounted on the bridge plate 3 with the piston rod facing downward, and a pressure block 7 located at the lower end of the piston rod of the top pressure cylinder 5. A pair of cylindrical positioning rods 8 parallel to the left-right direction are spaced apart on the upper end face of the slide 2 below the pressure block 7. A rotating shaft 10 for mounting a reamer 9 is rotatably arranged on one side of the base 1 in the left-right direction. A linear actuator 11 for driving the slide 2 to move in the left-right direction is also provided on the base 1.

[0110] In this embodiment, the slide table 2 is movably mounted on a pair of cylindrical guide rails 6, and the two ends of the cylindrical guide rails 6 are respectively connected to supports 13, and the supports 13 are fixedly connected to the base 1.

[0111] Preferably, the linear actuator 11 is a servo electric push rod.

[0112] Preferably, a pair of guide rods 12 are vertically arranged on the upper end face of the pressure block 7, and a pair of guide holes are correspondingly arranged on the bridge plate 4, with the pair of guide rods 12 slidably arranged in the pair of guide holes.

[0113] By providing a guide rod 12 on the pressure block 7, the reliability of part clamping is improved when the piston rod stroke of the top pressure cylinder 5 is long.

[0114] In this embodiment, a reduction gearbox 14 is provided on one side of the base 1 in the left-right direction, and the rotating shaft 10 is the output shaft of the reduction gearbox 14.

[0115] In this embodiment, the reduction gearbox 14 is equipped with a drive motor 15 for driving the rotating shaft 10 to rotate.

[0116] Preferably, the slide table 2 is provided with a lifting adjustment seat 16, the pair of columns 3 are erected on the lifting adjustment seat 16 on the slide table 2, and the pair of cylindrical positioning rods 8 are fixed on the lifting adjustment seat 16.

[0117] Preferably, a connecting plate 17 is connected between the two ends of the pair of cylindrical positioning rods 8.

[0118] Preferably, the lower end face of the pressure block 7 is provided with a V-groove 18 for pressing the outer circle of the cast aluminum rotor 27.

[0119] Preferably, the lower end face of the pressure block 7 is provided with a bakelite insert 19, and the V-groove 18 is provided on the bakelite insert 19.

[0120] As a further improvement to the aluminum rotor boring device in this embodiment, a blower 20 for cleaning the aluminum rotor 27 after boring is also provided on the other side of the base 1 in the left-right direction. The blower 20 includes a blower seat 21 fixed on the base 1 and a blower pipe 23 fixed on the blower seat 21 and connected to the compressed air pipeline 22. A sealing plate 28 is provided at the front end of the blower pipe 23, and a plurality of blower holes 25 connected to the inner hole of the blower pipe 23 are provided on the outer circle of the front end of the blower pipe 23, so that the outer circle of the front end of the blower pipe forms a blower head 24 for blowing the inner hole of the aluminum rotor. The blower pipe 23 is coaxially arranged with the rotating shaft 10 and is placed on the left and right sides of the slide table 2.

[0121] By setting up the blower 20, the inner hole of the part can be automatically blown and cleaned after reaming, which has high cleaning efficiency and good cleaning quality.

[0122] The outer diameter of the blow head 24 is smaller than the inner diameter of the cast aluminum rotor 27.

[0123] Preferably, the purge holes 25 are evenly spaced on the outer circumference of the front end section of the purge tube 23.

[0124] In this embodiment, a push rod connecting block 26 is provided at the lower end of the slide table 2, and the front end of the telescopic rod of the servo electric push rod is fixed on the push rod connecting block 26.

[0125] In this embodiment, an electrically controlled valve (not shown in the figure) is installed on the compressed air pipeline 22.

[0126] As a further improvement of this embodiment, a center height corrector 29 is also provided on the purger 20 for correcting the center height position of the inner hole of the cast aluminum rotor 27 before reaming. The center height corrector 29 includes an upper pipe joint 30 sealed and welded to the upper part of the inner wall of the front end section of the purge pipe 23, and a lower pipe joint 31 sealed and welded to the lower part of the inner wall of the front end section of the purge pipe 23. An upper airflow detection hole 32 connected to the upper pipe joint 30 is also provided at the upper part of the outer circle of the front end section of the purge pipe 23. A lower airflow detection hole 33 connected to the lower pipe joint 31 is also provided at the lower part of the outer circle of the front end section of the purge pipe 23. The upper pipe joint 30 and the lower pipe joint 31 are respectively connected to an upper airflow delivery pipe 34 and a lower airflow delivery pipe 35. The upper airflow delivery pipe 34 and the lower airflow delivery pipe 35 are connected to a pneumatic gauge 37 through a three-way switching valve 36.

[0127] In this embodiment, the top pressure cylinder 5, the linear actuator (servo electric push rod) 11, the drive motor 15, the electric control valve, the three-way switching valve 36, and the pneumatic gauge 37 are automatically controlled by the controller.

[0128] The usage method of this embodiment is as follows:

[0129] (1) Workpiece installation: Position the outer circle of the cast aluminum rotor 27 onto a pair of cylindrical positioning rods 8, and then drive the top pressure cylinder 5 to move, so that the pressure block 7 at the lower end of the piston rod of the top pressure cylinder 5 presses and fixes the cast aluminum rotor 27.

[0130] (2) Center height adjustment: Drive the linear actuator (servo electric push rod) 11 to move, so that the slide table 2 moves towards the blow head 24 and the blow head 24 enters the inner hole of the cast aluminum rotor 27; connect the compressed air pipeline 22 and spray compressed air through the blow hole 25 on the blow head 24 to pre-clean the inner hole of the cast aluminum rotor 27; after pre-cleaning, close the compressed air pipeline 22 and then connect the pneumatic meter 37. Through the switching of the three-way switching valve 36, detect the air flow of the upper air flow detection hole 33 and the lower air flow detection hole 34 respectively, and compare the air flow of the upper air flow detection hole 33 and the lower air flow detection hole 33. Adjust the upper and lower height positions of the cast aluminum rotor 27 through the lifting adjustment seat 16 so that the air flow of the upper air flow detection hole 32 and the lower air flow detection hole 33 are equal.

[0131] (3) Reaming: Turn on the drive motor 15 to drive the output shaft of the gearbox (rotary shaft 10) to rotate together with the reamer 9; drive the linear actuator (servo electric push rod) 11 to move, so that the slide table 2 moves to the side of the reamer 9, and the reamer 9 enters the inner hole of the cast aluminum rotor 27 to ream; after reaming to the limit position, drive the linear actuator (servo electric push rod) 11 to move, so that the slide table 2 retracts and resets to the middle initial position, the cast aluminum rotor 27 separates from the reamer 9, and the reaming operation is completed;

[0132] (4) Cleaning: Drive the linear actuator (servo electric push rod) 11 to move the slide 2 toward the blow head 24, and the blow head 24 enters the inner hole of the cast aluminum rotor 27; connect the compressed air pipeline 22, and spray compressed air through the blow hole 25 on the blow head 24 to clean the inner hole of the cast aluminum rotor 27; after cleaning, drive the linear actuator (servo electric push rod) 11 to move, so that the slide 2 retracts and resets to the middle initial position, and the cleaning operation of the inner hole of the cast aluminum rotor 27 is completed.

[0133] (5) Take the part: Turn off the drive motor 15 so that the output shaft of the gearbox (rotating shaft 10) and the reamer 9 stop rotating; drive the top pressure cylinder 5 to move, so that the piston rod of the top pressure cylinder 5 retracts, and the pressure block 7 at the lower end of the piston rod of the top pressure cylinder 5 releases the core of the cast aluminum rotor iron 27, and the operator takes away the cast aluminum rotor 27.

[0134] (6) Cyclic operation: Repeat steps (1) to (4) to complete the reaming operation of the next cast aluminum rotor 27.

[0135] Preferably, in step (2), during pre-cleaning, the linear actuator (servo electric push rod) 11 is driven to move, causing the slide table 2 to move back and forth, thereby achieving reciprocating pre-cleaning;

[0136] Preferably, in step (4) cleaning, the linear actuator (servo electric push rod) 11 drives the slide table 2 to move back and forth several times to further improve the cleaning effect of the inner hole of the cast aluminum rotor 27.

[0137] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A production line for automatically assembling cast aluminum rotors for asynchronous motors in new energy vehicles, characterized in that, The system includes, in sequence according to the production process of cast aluminum rotors, a rotor core stamping area, a rotor core degreasing area, a rotor core aluminum casting area, a cast aluminum rotor inner hole reaming area, and a cast aluminum rotor automatic shaft mounting area. The automatic shaft mounting area is equipped with a cast aluminum rotor loading station, a shaft loading station, a cast aluminum rotor heating station, an automatic shaft mounting station, and a shaft mounting robot. These stations are arranged circumferentially around the periphery of the shaft mounting robot. The rotor core stamping area contains the rotor core. The stamping progressive die includes a core drying and degreasing device in the rotor core degreasing zone, a rotor core die casting machine in the rotor core aluminum casting zone, and a cast aluminum rotor reaming device in the cast aluminum rotor inner hole reaming zone. The cast aluminum rotor loading station includes a cast aluminum rotor storage bin, the shaft loading station includes a shaft storage bin, the cast aluminum rotor heating station includes a core heating device, and the automatic shaft mounting station includes an automatic shaft mounting mechanism for mounting the shaft into the inner hole of the cast aluminum rotor. The automatic shaft mounting mechanism includes a press that is matched with the shaft mounting robot, and a rotor positioning mold that is set on the press workbench for positioning the cast aluminum rotor. The rotor positioning mold includes a vertical frame, a lifter set at the lower part of the vertical frame, a hydrostatic expansion mandrel that is erected at the upper part of the lifter and extends upward to the upper part of the vertical frame for positioning the inner hole of the cast aluminum rotor, and several floating support cylinders that are set at the upper part of the vertical frame and located around the hydrostatic expansion mandrel for positioning the lower end face of the cast aluminum rotor. The hydrostatic expansion mandrel is a liquid plastic hydrostatic expansion mandrel, which includes a mandrel body, an expansion sleeve fitted on the outer circle of the mandrel body by an interference fit, annular grooves respectively disposed at both ends of the inner hole of the expansion sleeve, a liquid plastic filling channel disposed inside the mandrel body and connected to the annular groove on the outer circle of the mandrel body, a liquid plastic extrusion hole opened on the mandrel body and connected to the liquid plastic filling channel, and a liquid plastic pressure cylinder fixed on the mandrel body with its piston rod inserted into the liquid plastic extrusion hole; a thin wall is formed between the bottom of the annular groove and the outer circle of the expansion sleeve, and the annular groove, the liquid plastic filling channel and the liquid plastic extrusion hole are filled with liquid plastic.

2. The automatic shaft-loading production line for cast aluminum rotors of asynchronous motors for new energy vehicles according to claim 1, characterized in that, It also includes a cast aluminum rotor cooling zone, which is set after the automatic shaft mounting area of ​​the cast aluminum rotor according to the production process of the cast aluminum rotor, and is used to cool the cast aluminum rotor after shaft mounting. The cast aluminum rotor cooling zone is equipped with an air cooling device.

3. The automatic shaft-loading production line for cast aluminum rotors of asynchronous motors for new energy vehicles according to claim 1, characterized in that, A central guide hole is also provided axially at the upper center position of the mandrel body. A floating ejector pin is provided in the central guide hole by means of a spring to elastically press against the lower center hole of the rotating shaft during assembly to achieve assembly alignment.

4. The automatic shaft-loading production line for cast aluminum rotors of asynchronous motors for new energy vehicles according to claim 1, characterized in that, The shaft-mounting robot arm is equipped with a shaft clamp for clamping the outer circle of the cast aluminum rotor and the outer circle of the shaft; the shaft clamp includes a finger cylinder at the front end of the shaft-mounting robot arm, a pair of clamping blocks respectively disposed on the finger cylinder and capable of clamping each other, and a pair of clamping fingers disposed on each clamping block, wherein the clamping fingers are provided with V-grooves for positioning and clamping the outer circle of the cast aluminum rotor or the shaft.

5. The automatic shaft-loading production line for cast aluminum rotors of asynchronous motors for new energy vehicles according to claim 1, characterized in that, The upper end face of the spindle body is provided with a sensor mounting hole, and a distance measuring sensor is installed in the sensor mounting hole for dynamically monitoring the height position of the lower end face of the upper spindle during spindle assembly.

6. The automatic shaft-loading production line for cast aluminum rotors of asynchronous motors for new energy vehicles according to claim 2, characterized in that, It also includes a dynamic balancing zone and a cleaning zone, which are set sequentially after the cooling zone of the cast aluminum rotor according to the production process of the cast aluminum rotor.

7. The automatic shaft-loading production line for cast aluminum rotors of asynchronous motors for new energy vehicles according to claim 1, characterized in that, The cast aluminum rotor reaming device includes a base, a slide table movable on the base in the left-right direction, a pair of columns erected on the front and rear sides of the upper surface of the slide table, a bridge plate connected between the tops of the pair of columns, a top pressure cylinder mounted on the bridge plate with the piston rod facing downwards, a pressure block located at the lower end of the piston rod of the top pressure cylinder, a pair of cylindrical positioning rods parallel to the left-right direction spaced apart on the upper surface of the slide table below the pressure block, a rotating shaft for mounting the reamer rotatably mounted on one side of the base in the left-right direction, and a linear actuator for driving the slide table to move in the left-right direction on the base.

8. The automatic shaft-loading production line for cast aluminum rotors of asynchronous motors for new energy vehicles according to claim 7, characterized in that, A blower for cleaning the cast aluminum rotor after boring is also provided on the other side of the base in the left-right direction; the blower includes a blower seat fixed on the base and a blower pipe fixed on the blower seat and connected to a compressed air pipeline. A sealing plate is provided at the front end of the blower pipe and a plurality of blower holes connected to the inner hole of the blower pipe are provided on the outer circle of the front end of the blower pipe, so that the outer circle of the front end of the blower pipe forms a blower head for blowing the inner hole of the cast aluminum rotor; the blower pipe is coaxially arranged with the rotating shaft and is placed on the left and right sides of the slide.

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