Concentric machining method for outer rotor of direct drive motor

Abstract

This invention relates to the field of direct drive motor manufacturing technology, specifically to a concentric machining method for the outer rotor of a direct drive motor. The method includes an outer rotor comprising a rotor housing and a rotating shaft centrally connected to the rotor housing. The machining equipment includes a conveying device, a fixture mounted on the conveying device for placing and conveying the outer rotor, an assembly device located on one side of the conveying device, and a machining device located on one side of the conveying device and behind the assembly device. The conveying device drives the fixture and the outer rotor for conveying; the assembly device installs the rotating shaft into the outer rotor; and the machining device performs concentric machining of the rotating shaft and the rotor housing with the rotating shaft. This invention solves the problems of low efficiency in existing manual assembly and dial indicator testing methods, ensuring rotor housing precision and achieving high production efficiency.

Description

Technical Field

[0001] This invention relates to the field of direct drive motor manufacturing technology, and in particular to a method for concentric machining of the outer rotor of a direct drive motor. Background Technology

[0002] A direct-drive motor, short for a direct-drive motor, refers to a motor that drives a load without requiring a transmission device (such as a belt or gear) to achieve the desired drive output. Many existing intelligent robots and intelligent cleaning equipment utilize direct-drive motors as their power source.

[0003] Direct-drive motors include internal rotor drives and external rotor drives, with external rotor drives generally used in fields such as robotics. As an indispensable and crucial structure in robots, the external rotor of the motor requires extremely high precision. Currently, most rotor housings are formed by stamping, which, while reducing structural costs, makes it difficult to control precision. Therefore, improvements are needed to enhance the precision of external rotor manufacturing. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a concentric machining method for the outer rotor of a direct-drive motor that solves the inefficiencies of existing manual assembly and dial indicator testing methods, ensures rotor housing precision, and achieves high production efficiency.

[0005] The technical solution adopted by this utility model is: a concentric machining method for the outer rotor of a direct drive motor, including an outer rotor and machining equipment. The outer rotor includes a rotor housing and a rotating shaft centrally connected to the rotor housing. A clamping position is provided on one side of the rotor housing. The machining equipment includes a conveying device, a fixture installed on the conveying device for placing and conveying the outer rotor, an assembly device located on one side of the conveying device, and a machining device located on one side of the conveying device and behind the assembly device. The conveying device is used to drive the fixture and the outer rotor for conveying. The assembly device is used to install the rotating shaft into the outer rotor. The machining device is used to machine the rotating shaft and the rotor housing concentrically with the rotating shaft.

[0006] The processing device includes a material picking and rotating assembly, a processing fixing assembly, and a processing assembly. The material picking and rotating assembly is used to pick up and rotate the outer rotor from the fixture. The processing fixing assembly is used to clamp and fix the rotated outer rotor. The processing assembly is used to process the outer rotor fixed by the processing fixing assembly.

[0007] The processing method includes the following steps:

[0008] S1, Rotor housing machining: Roughly machine the rotor housing and finish machine the clamping positions;

[0009] S2, Rotor housing conveying: The rotor housing is placed on the fixture and conveyed to the bottom of the assembly device via a conveying device;

[0010] S3, Rotary shaft assembly: The assembly device assembles the rotary shaft onto the rotor housing in a centered position and fixes it in place;

[0011] S4, Concentric machining: The conveying device transports the rotor housing with the completed rotating shaft assembly to the machining device position, and the machining device performs concentric machining on the rotating shaft and the rotor housing.

[0012] During the concentric machining process, the outer diameter of the rotor housing is gripped by the material-grabbing rotating assembly and removed from the fixture. After removal, the rotor housing is rotated 90 degrees toward the machining fixing assembly. The machining fixing assembly clamps and fixes the rotor housing in the clamping position. After fixing, the outer diameter of the rotating shaft, the inner diameter of the rotor housing, and the outer diameter of the rotor housing are processed sequentially by the machining assembly to complete the concentric machining.

[0013] A further improvement to the above solution is that the outer diameter of the clamping position is smaller than the outer diameter of the rotor housing, the fixture is provided with a placement groove, the placement groove is provided with a positioning step, the positioning step is used for positioning the clamping position, and the placement groove is provided with a through hole at the center.

[0014] During rotor housing conveying: The clamping position is placed on the positioning step for positioning, and then the conveying device drives the rotor housing to be conveyed.

[0015] A further improvement to the above solution is that the conveying device includes a conveying bracket, a conveying roller mounted on the conveying bracket, a conveying chain for transmitting to the conveying roller, and a conveying motor mounted on the conveying bracket for driving the conveying chain. The fixture is connected to the conveying chain and is transmitted along with the conveying chain.

[0016] During rotor housing conveying: the conveyor motor drives the conveyor rollers to drive the conveyor chain for transmission, and the conveyor chain also drives the jig for transmission during the process.

[0017] A further improvement to the above solution is that the assembly device is a riveting device, which rivets the rotating shaft to the rotor housing.

[0018] A further improvement to the above solution is that the riveting device includes a stamping head and a hydraulic lifting assembly. The stamping head is located above the conveying device and is used to stamp and assemble the rotating shaft onto the rotor housing. During stamping, the hydraulic lifting assembly supports and lifts the bottom of the fixture.

[0019] During the assembly of the rotating shaft, the rotating shaft is stamped and riveted to the rotor housing by a stamping die.

[0020] A further improvement to the above solution is that the assembly device is a welding device, which welds the rotating shaft to the rotor housing.

[0021] A further improvement to the above solution is that the welding device includes a chuck for clamping the rotating shaft, a rotary drive motor for driving the chuck to rotate the rotating shaft at high speed, and a lifting drive seat for driving the chuck to move toward the rotor housing. The welding device also includes a hydraulic lifting assembly, which is connected to a tray, and the tray is used to lift and position the rotor housing during welding.

[0022] During the assembly of the rotating shaft, the rotary drive motor drives the chuck to rotate the rotating shaft at high speed, and the friction generated during the high-speed rotation causes the rotor shell and the rotating shaft to be frictionally fused together to form a whole.

[0023] A further improvement to the above scheme is that the welding device further includes a cooling assembly, which includes at least two cooling nozzles for cooling the rotor housing after welding; the rotor housing and the rotating shaft are cooled by the cooling nozzles before processing.

[0024] A further improvement to the above solution is that it also includes a clamping and positioning device, which is located on the lower side of the assembly device and is used to clamp and fix the rotor housing during assembly. The clamping and positioning device includes two sets of symmetrically arranged clamping drive seats and a positioning clamping plate connected to the clamping drive seats. The positioning clamping plate is provided with a positioning clamping groove.

[0025] During assembly, the clamping drive seat drives the positioning clamping plate to clamp and fix the rotor housing through the positioning clamping slot.

[0026] A further improvement to the above solution is that the material handling rotating assembly includes a lifting module, a rotating module connected to the lifting module, and a first clamping module connected to the rotating module;

[0027] A further improvement to the above solution is that the processing and fixing assembly includes a fixing bracket, a propulsion module mounted on the fixing bracket, and a second clamping module mounted on the propulsion module. A clamping position is provided on one side of the rotor housing, and the second clamping module is used to clamp the clamping position.

[0028] A further improvement to the above solution is that the processing component includes an XYZ module, a spindle module mounted on the XYZ module, the spindle module being equipped with a processing head and a drive motor, the drive motor being used to drive the spindle module to drive the processing head for processing the rotor housing and rotating shaft; the processing head is a milling cutter head or a grinding head;

[0029] A further improvement to the above scheme is that, during the concentric processing, the material-picking rotating assembly drives the rotating module and the first clamping module to descend through the lifting module and grab the rotor shell. After grabbing, the rotating module drives the first clamping module and the rotor shell it clamps to rotate 90 degrees. At this time, the pushing module drives the second clamping module to clamp and fix the rotor shell in the clamping position and push the rotor shell to the designated position. Then, the XYZ module drives the processing head to process the rotor shell and the rotating shaft.

[0030] The beneficial effects of this invention are:

[0031] Compared to existing motor outer rotor processing methods, this utility model employs an automated approach for the automatic assembly and concentric machining of the motor rotor housing and rotating shaft. A conveying device and fixture work together to automatically transport the outer rotor. Upon reaching the designated position, an assembly device automatically assembles the rotating shaft onto the rotor housing. Then, a machining device processes the concentricity of the rotating shaft and rotor housing to ensure they are on the same center, resulting in high structural precision. This solves the problems of low efficiency associated with existing manual assembly methods such as dial indicator testing, ensuring rotor housing precision and high production efficiency. Specifically, it includes an outer rotor and processing equipment. The outer rotor comprises a rotor housing and a rotating shaft centrally connected to the rotor housing. A clamp is provided on one side of the rotor housing. The processing equipment includes a conveying device, a fixture mounted on the conveying device for placing and conveying the outer rotor, an assembly device located on one side of the conveying device, and a processing device located on one side of the conveying device and behind the assembly device. The conveying device is used to drive the fixture and the outer rotor for conveying. The assembly device is used to install the rotating shaft into the outer rotor. The processing device is used to process the rotating shaft and the rotor housing concentrically with the rotating shaft. The processing device includes a material picking and rotating assembly, a processing fixing assembly, and a processing assembly. The material picking and rotating assembly is used to pick up and rotate the outer rotor from the fixture. The processing fixing assembly is used to clamp and fix the rotated outer rotor. The processing assembly is used to process the outer rotor fixed by the processing fixing assembly.

[0032] The processing method includes the following steps: S1, rotor housing machining: rough machining of the rotor housing and precision machining of the clamping positions; S2, rotor housing conveying: placing the rotor housing on the fixture and conveying it to the bottom of the assembly device via a conveying device; S3, rotating shaft assembly: the assembly device centered and assembled the rotating shaft onto the rotor housing and fixes it; S4, concentric machining: the conveying device conveys the rotor housing with the rotating shaft assembled to the machining device, where the machining device performs concentric machining on the rotating shaft and the rotor housing. During concentric machining, the outer diameter of the rotor housing is gripped by the material-grabbing rotating component, and the rotor housing is removed from the fixture. After removal, it is rotated 90 degrees toward the machining fixing component, which clamps and fixes the clamping positions of the rotor housing. After fixing, the machining component sequentially processes the outer diameter of the rotating shaft, the inner diameter of the rotor housing, and the outer diameter of the rotor housing to complete the concentric machining. The overall assembly and machining process is automated, with high assembly accuracy and labor saving. Concentricity is guaranteed through one-time machining during the concentric machining process, resulting in high structural precision. Attached Figure Description

[0033] Figure 1 This is a three-dimensional schematic diagram of the processing equipment of the present invention;

[0034] Figure 2 for Figure 1 A three-dimensional schematic diagram of the processing equipment from another perspective;

[0035] Figure 3 for Figure 1 A three-dimensional schematic diagram of the processing equipment from another perspective;

[0036] Figure 4 This is a three-dimensional schematic diagram of the outer rotor of the present invention;

[0037] Figure 5 This is a flowchart illustrating the processing method of the present invention.

[0038] Explanation of reference numerals in the attached drawings: outer rotor 1, rotor housing 11, clamping position 111, rotating shaft 12, conveying device 2, conveying bracket 21, conveying roller 22, conveying chain 23, conveying motor 24, jig 3, placement groove 31, through hole 311, positioning step 32, assembly device 4, stamping head 41, hydraulic lifting assembly 42, pallet 421, chuck 43, rotary drive motor 44, lifting drive seat 45, cooling assembly 46, nozzle 461, processing device 5, material picking rotating assembly 51, lifting module 511, rotating module 512, first clamping module 513, processing fixing assembly 52, fixing bracket 521, pushing module 522, second clamping module 523, processing assembly 53, XYZ module 531, spindle module 532, processing head 533, drive motor 534, clamping and positioning device 6, clamping drive seat 61, positioning clamping plate 62. Detailed Implementation

[0039] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0040] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0042] like Figures 1-5 As shown, in one embodiment of the present invention, a concentric machining method for the outer rotor of a direct drive motor includes an outer rotor 1, the outer rotor 1 including a rotor housing 11 and a rotating shaft 12 centrally connected to the rotor housing 11; the machining equipment includes a conveying device 2, a fixture 3 installed on the conveying device 2 for placing and conveying the outer rotor 1, an assembly device 4 located on one side of the conveying device 2, and a machining device 5 located on one side of the conveying device 2 and behind the assembly device 4. The conveying device 2 is used to drive the fixture 3 and the outer rotor 1 for conveying, the assembly device 4 is used to install the rotating shaft 12 into the outer rotor 1, and the machining device 5 is used to concentrically machine the rotating shaft 12 with the rotor housing 11 and the rotating shaft 12.

[0043] The processing device 5 includes a material picking and rotating assembly 51, a processing fixing assembly 52, and a processing assembly 53. The material picking and rotating assembly 51 is used to pick up and rotate the outer rotor 1 from the fixture 3. The processing fixing assembly 52 is used to clamp and fix the rotated outer rotor 1. The processing assembly 53 is used to process the outer rotor 1 fixed by the processing fixing assembly 52.

[0044] The processing method includes the following steps:

[0045] S1, Rotor housing machining: Roughly machine the rotor housing and finish machine the clamping positions;

[0046] S2, Rotor housing conveying: The rotor housing is placed on the fixture and conveyed to the bottom of the assembly device via a conveying device;

[0047] S3, Rotary shaft assembly: The assembly device assembles the rotary shaft onto the rotor housing in a centered position and fixes it in place;

[0048] S4, Concentric Machining: The conveying device transports the rotor housing with the completed rotating shaft assembly to the machining device position. The machining device performs concentric machining on the rotating shaft and the rotor housing. During the concentric machining process, the outer diameter of the rotor housing is gripped by the material picking and rotating assembly and the rotor housing is removed from the fixture. After removal, it is rotated 90 degrees toward the machining fixing assembly. The machining fixing assembly clamps and fixes the clamping position of the rotor housing. After fixing, the outer diameter of the rotating shaft, the inner diameter of the rotor housing, and the outer diameter of the rotor housing are machined sequentially by the machining assembly to complete the concentric machining.

[0049] An improvement to the above embodiment is that a clamping position 111 is provided on one side of the rotor housing 11. The outer diameter of the clamping position 111 is smaller than the outer diameter of the rotor housing 11. The fixture 3 has a placement groove 31 and a positioning step 32. The positioning step 32 is used to position the clamping position 111. A through hole 311 is provided at the center of the placement groove 31. The purpose of setting the clamping position 111 on one side of the rotor housing 11 is to use the clamping position 111 as a standard. During subsequent processing, the clamping is also performed through this position. The structure has high precision and strong practicality. Moreover, the placement groove 31 and the positioning step 32 also facilitate the positioning of the structure.

[0050] During rotor housing conveying: The clamping position is placed on the positioning step for positioning, and then the conveying device drives the rotor housing to be conveyed.

[0051] An improvement to the above embodiment is that the conveying device 2 includes a conveying bracket 21, a conveying roller 22 mounted on the conveying bracket 21, a conveying chain 23 for conveying the conveying roller 22, and a conveying motor 24 mounted on the conveying bracket 21 for driving the conveying chain 23. The fixture 3 is connected to the conveying chain 23 and follows the conveying chain 23 for transmission. The conveying motor 24 drives the conveying roller 22 to drive the conveying chain 23 for transmission. When the conveying chain 23 is transmitting, it drives the fixture 3 to move and convey.

[0052] During rotor housing conveying: the conveyor motor drives the conveyor rollers to drive the conveyor chain for transmission, and the conveyor chain also drives the jig for transmission during the process.

[0053] See Figure 2 As shown, in another embodiment of the present invention, the assembly device 4 is a riveting device, which rivets the rotating shaft 12 to the rotor housing 11. The rotating shaft 12 and the rotor housing 11 are riveted together by riveting, and the connection between the two structures is stable and the production efficiency is high.

[0054] An improvement to the above embodiment is that the riveting device includes a stamping head 41 and a hydraulic lifting assembly 42. The stamping head 41 is located above the conveying device 2 and is used to stamp and assemble the rotating shaft 12 onto the rotor housing 11. During stamping, the hydraulic lifting assembly 42 supports and lifts the bottom of the fixture 3. After the rotating shaft 12 is fixed by the stamping head 41, it is stamped onto the rotor housing 11. During stamping, the hydraulic lifting assembly 42 plays a lifting and buffering role to ensure the stability of the stamping process.

[0055] During the assembly of the rotating shaft, the rotating shaft is stamped and riveted to the rotor housing by a stamping die.

[0056] See Figure 3 As shown, in another embodiment of the present invention, the assembly device 4 is a welding device, which welds the rotating shaft 12 to the rotor housing 11. In this embodiment, the rotating shaft 12 and the rotor housing 11 are connected by welding. The two are welded together by metallurgical welding, forming a whole with a reliable structure.

[0057] An improvement to the above embodiment is that the welding device includes a chuck 43 for clamping the rotating shaft 12, a rotary drive motor 44 for driving the chuck 43 to rotate the rotating shaft 12 at high speed, and a lifting drive seat 45 for driving the chuck 43 to move toward the rotor housing 11. The welding device also includes a hydraulic lifting assembly 42, which is connected to a tray 421. The tray is used to lift and position the rotor housing 11 during welding. Specifically, the rotary drive motor 44 drives the chuck 43 to rotate the rotating shaft 12 at high speed. Under the action of high-speed friction, the rotating shaft 12 and the rotor housing 11 are welded together to form an integral connection. The overall structure has better integrity and is more reliable. During welding, the lifting assembly also drives the tray 421 to lift and fix the rotor housing 11, preventing structural deformation.

[0058] During the assembly of the rotating shaft, the rotary drive motor drives the chuck to rotate the rotating shaft at high speed, and the friction generated during the high-speed rotation causes the rotor shell and the rotating shaft to be frictionally fused together to form a whole.

[0059] An improvement to the above embodiment is that the welding device further includes a cooling assembly 46, which includes at least two cooling nozzles 461. The cooling nozzles 461 are used to cool the rotor housing 11 after welding. The cooling assembly 46 is provided to cool the rotor housing 11 after welding, which facilitates subsequent processing.

[0060] The improvement to the above two embodiments is that it further includes a clamping and positioning device 6. The clamping and positioning device 6 is located on the lower side of the assembly device 4 and is used to clamp and fix the rotor housing 11 during assembly. The clamping and positioning device 6 includes two sets of symmetrically arranged clamping drive seats 61 and a positioning clamping plate 62 connected to the clamping drive seats 61. The positioning clamping plate 62 has a positioning clamping groove. After riveting and welding processes, the clamping drive seats 61 must drive the positioning clamping plate 62 to clamp and fix the rotor housing 11 to ensure structural accuracy.

[0061] During assembly, the clamping drive seat drives the positioning clamping plate to clamp and fix the rotor housing through the positioning clamping slot.

[0062] In another embodiment of the present invention, the material picking and rotating assembly 51 includes a lifting module 511, a rotating module 512 connected to the lifting module 511, and a first clamping module 513 connected to the rotating module 512; the lifting module 511 drives the rotating module 512 and the first clamping module 513 to grab the outer diameter of the rotor housing 11, and rotates it 90 degrees after grabbing, so that the processing fixing assembly 52 can clamp and fix the clamping position 111.

[0063] An improvement to the above embodiment is that the processing and fixing component 52 includes a fixing bracket 521, a propulsion module 522 mounted on the fixing bracket 521, and a second clamping module 523 mounted on the propulsion module 522. A clamping position 111 is provided on one side of the rotor housing 11. The second clamping module 523 is used to clamp the clamping position 111. The second clamping module 523 has a three-jaw clamping position 111 for clamping and fixing. The structure is clamped stably, has high concentricity, and high structural precision.

[0064] An improvement to the above embodiment is that the processing component 53 includes an XYZ module 531 and a spindle module 532 installed in the XYZ module 531. The spindle module 532 is equipped with a processing head 533 and a drive motor 534. The drive motor 534 is used to drive the spindle module 532 to drive the processing head 533 to process the rotor housing 11 and the rotating shaft 12.

[0065] During the concentric processing, the material picking and rotating assembly drives the rotating module and the first clamping module to descend through the lifting module and grab the rotor shell. After grabbing, the rotating module drives the first clamping module and the rotor shell it clamps to rotate 90 degrees. At this time, the pushing module drives the second clamping module to clamp and fix the rotor shell in the clamping position and push the rotor shell to the designated position. Then, the XYZ module drives the processing head to process the rotor shell and the rotating shaft.

[0066] This invention employs an automated method for the automatic assembly and concentric processing of the motor rotor housing and rotating shaft. A conveying device and fixture work together to automatically transport the outer rotor. Upon reaching the designated position, an assembly device automatically assembles the rotating shaft onto the rotor housing. A processing device then processes the concentricity of the rotating shaft and rotor housing to ensure they are on the same center, resulting in high structural precision. This invention solves the problems of low efficiency associated with existing manual assembly methods such as dial indicator testing, ensuring rotor housing precision and high production efficiency. Specifically, an outer rotor 1 is provided, which includes a rotor housing 11 and a rotating shaft 12 centrally connected to the rotor housing 11. The processing equipment includes a conveying device 2, a fixture 3 installed on the conveying device 2 for placing and conveying the outer rotor 1, an assembly device 4 located on one side of the conveying device 2, and a processing device 5 located on one side of the conveying device 2 and behind the assembly device 4. The conveying device 2 is used to drive the fixture 3 and the outer rotor 1 for conveying. The assembly device 4 is used to install the rotating shaft 12 into the outer rotor 1. The processing device 5 is used to process the rotating shaft 12 and the rotor housing 11 concentrically. Before processing, a margin needs to be reserved for the outer diameter of the rotating shaft 12, as well as the outer diameter and inner diameter of the rotor housing 11. Finally, the processing device 5 processes them to the specified dimensions, thereby ensuring the consistency of concentricity between the two and facilitating subsequent assembly and use. The processing device 5 includes a material picking and rotating assembly 51, a processing fixing assembly 52, and a processing assembly 53. The material picking and rotating assembly 51 is used to pick up and rotate the outer rotor 1 from the fixture 3. The processing fixing assembly 52 is used to clamp and fix the rotated outer rotor 1. The processing assembly 53 is used to process the outer rotor 1 fixed by the processing fixing assembly 52.

[0067] The processing method includes the following steps: S1, rotor housing machining: rough machining of the rotor housing and precision machining of the clamping positions; S2, rotor housing conveying: placing the rotor housing on the fixture and conveying it to the bottom of the assembly device via a conveying device; S3, rotating shaft assembly: the assembly device centered and assembled the rotating shaft onto the rotor housing and fixes it; S4, concentric machining: the conveying device conveys the rotor housing with the rotating shaft assembled to the machining device, where the machining device performs concentric machining on the rotating shaft and the rotor housing. During concentric machining, the outer diameter of the rotor housing is gripped by the material-grabbing rotating component, and the rotor housing is removed from the fixture. After removal, it is rotated 90 degrees toward the machining fixing component, which clamps and fixes the clamping positions of the rotor housing. After fixing, the machining component sequentially processes the outer diameter of the rotating shaft, the inner diameter of the rotor housing, and the outer diameter of the rotor housing to complete the concentric machining. The overall assembly and machining process is automated, with high assembly accuracy and labor saving. Concentricity is guaranteed through one-time machining during the concentric machining process, resulting in high structural precision.

[0068] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A concentric machining method of an outer rotor of a direct drive motor, characterized by: The system includes an outer rotor and processing equipment. The outer rotor includes a rotor housing and a rotating shaft centrally connected to the rotor housing. A clamping position is provided on one side of the rotor housing. The processing equipment includes a conveying device, a fixture mounted on the conveying device for placing and conveying the outer rotor, an assembly device located on one side of the conveying device, and a processing device located on one side of the conveying device and behind the assembly device. The conveying device is used to drive the fixture and the outer rotor for conveying. The assembly device is used to install the rotating shaft into the outer rotor. The processing device is used to process the rotating shaft and the rotor housing concentrically with the rotating shaft. The processing device includes a material picking and rotating assembly, a processing fixing assembly, and a processing assembly. The material picking and rotating assembly is used to pick up and rotate the outer rotor from the fixture. The processing fixing assembly is used to clamp and fix the rotated outer rotor. The processing assembly is used to process the outer rotor fixed by the processing fixing assembly. The material handling rotating assembly includes a lifting module, a rotating module connected to the lifting module, and a first clamping module connected to the rotating module; The processing and fixing assembly includes a fixing bracket, a propulsion module mounted on the fixing bracket, and a second clamping module mounted on the propulsion module. A clamping position is provided on one side of the rotor housing, and the second clamping module is used to clamp the clamping position. The processing assembly includes an XYZ module, a spindle module mounted on the XYZ module, a processing head and a drive motor mounted on the spindle module, and the drive motor is used to drive the spindle module to drive the processing head for processing the rotor housing and rotating shaft; the processing head is a milling cutter head or a grinding head. The processing method includes the following steps: S1, Rotor housing machining: Roughly machine the rotor housing and finish machine the clamping positions; S2, Rotor housing conveying: The rotor housing is placed on the fixture and conveyed to the bottom of the assembly device via a conveying device; S3, Rotary shaft assembly: The assembly device assembles the rotary shaft onto the rotor housing in a centered position and fixes it in place; S4, Concentric machining: The conveying device transports the rotor housing with the completed rotating shaft assembly to the machining device position, and the machining device performs concentric machining on the rotating shaft and the rotor housing. During the concentric machining process, the outer diameter of the rotor housing is gripped by the material-grabbing rotating assembly and removed from the fixture. After removal, the rotor housing is rotated 90 degrees toward the machining fixing assembly. The machining fixing assembly clamps and fixes the rotor housing in the clamping position. After fixing, the outer diameter of the rotating shaft, the inner diameter of the rotor housing, and the outer diameter of the rotor housing are processed sequentially by the machining assembly to complete the concentric machining.

2. The concentric machining method of a direct drive motor outer rotor according to claim 1, characterized in that: The outer diameter of the clamping position is smaller than the outer diameter of the rotor housing. The fixture has a placement groove with a positioning step for positioning the clamping position. A through hole is provided at the center of the placement groove. During rotor housing conveying: The clamping position is placed on the positioning step for positioning, and then the conveying device drives the rotor housing to be conveyed.

3. The concentric machining method for the outer rotor of a direct-drive motor according to claim 1, characterized in that: The conveying device includes a conveying bracket, a conveying roller mounted on the conveying bracket, a conveying chain for conveying the conveying roller, and a conveying motor mounted on the conveying bracket for driving the conveying chain. The fixture is connected to the conveying chain and is conveyed along with the conveying chain. During rotor housing conveying: the conveyor motor drives the conveyor rollers to drive the conveyor chain for transmission, and the conveyor chain also drives the jig for transmission during the process.

4. The concentric machining method for the outer rotor of a direct-drive motor according to claim 1, characterized in that: The assembly device is a riveting device, which rivets the rotating shaft to the rotor housing.

5. The concentric machining method for the outer rotor of a direct-drive motor according to claim 4, characterized in that: The riveting device includes a stamping head and a hydraulic lifting assembly. The stamping head is located above the conveying device and is used to stamp and assemble the rotating shaft onto the rotor housing. During stamping, the hydraulic lifting assembly supports and lifts the bottom of the fixture. During the assembly of the rotating shaft, the rotating shaft is stamped and riveted to the rotor housing by a stamping die.

6. The concentric machining method for the outer rotor of a direct-drive motor according to claim 1, characterized in that: The assembly device is a welding device, which welds the rotating shaft to the rotor housing.

7. The concentric machining method for the outer rotor of a direct-drive motor according to claim 6, characterized in that: The welding device includes a chuck for clamping the rotating shaft, a rotary drive motor for driving the chuck to rotate the rotating shaft at high speed, and a lifting drive seat for driving the chuck to move toward the rotor housing. The welding device also includes a hydraulic lifting assembly connected to a tray, which is used to lift and position the rotor housing during welding. During the assembly of the rotating shaft, the rotary drive motor drives the chuck to rotate the rotating shaft at high speed, and the friction generated during the high-speed rotation causes the rotor shell and the rotating shaft to be frictionally fused together to form a whole.

8. The concentric machining method for the outer rotor of a direct-drive motor according to claim 7, characterized in that: The welding device also includes a cooling assembly, which includes at least two cooling nozzles for cooling the rotor housing after welding; the rotor housing and the rotating shaft are cooled by the cooling nozzles before processing.

9. The concentric machining method for the outer rotor of a direct-drive motor according to any one of claims 4 to 8, characterized in that: It also includes a clamping and positioning device, which is located on the lower side of the assembly device and is used to clamp and fix the rotor housing during assembly. The clamping and positioning device includes two sets of symmetrically arranged clamping drive seats and a positioning clamping plate connected to the clamping drive seats. The positioning clamping plate has a positioning clamping groove. During assembly, the clamping drive seat drives the positioning clamping plate to clamp and fix the rotor housing through the positioning clamping slot.

10. The concentric machining method for the outer rotor of a direct-drive motor according to claim 1, characterized in that: During the concentric processing, the material picking and rotating assembly drives the rotating module and the first clamping module to descend through the lifting module and grab the rotor shell. After grabbing, the rotating module drives the first clamping module and the rotor shell it clamps to rotate 90 degrees. At this time, the pushing module drives the second clamping module to clamp and fix the rotor shell in the clamping position and push the rotor shell to the designated position. Then, the XYZ module drives the processing head to process the rotor shell and the rotating shaft.

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