Auxiliary device for welding a rotor

Abstract

The utility model discloses a kind of auxiliary devices for rotor welding, belong to motor rotor welding technical field;It includes: base, positioning assembly and top extension component, the positioning assembly includes vertically arranged positioning mandrel and cooling unit, the bottom of the positioning mandrel is connected with the base;Stepped platform for supporting rotor and rotor support is equipped on the positioning mandrel;The cooling unit is arranged inside the positioning mandrel, to prevent positioning mandrel from expanding by heating;The top extension component includes top extension unit and linear drive, the top extension unit is arranged around the positioning mandrel, the output end of the linear drive is connected with the top extension unit, to separate the top extension rotor from the positioning mandrel.The utility model can inhibit the thermal expansion deformation of positioning mandrel, and automatically eject rotor.

Description

Technical Field

[0001] This utility model relates to the field of motor rotor welding technology, and in particular to an auxiliary device for rotor welding. Background Technology

[0002] The rotor and rotor support need to be welded together to form a whole.

[0003] When welding the rotor to the rotor support, the heat generated during welding causes the welding fixture to expand, making it difficult to remove the rotor from the welding fixture. At the same time, due to the weight of the rotor and rotor support themselves, moving the rotor and rotor support relative to the welding fixture is time-consuming and labor-intensive. Utility Model Content

[0004] In view of this, it is necessary to provide an auxiliary device for rotor welding to solve the problem that existing rotors and welding fixtures are difficult to separate after welding.

[0005] This utility model provides an auxiliary device for rotor welding, comprising: abutment; A positioning assembly includes a vertically arranged positioning mandrel and a cooling unit. The bottom of the positioning mandrel is connected to the base. The positioning mandrel is provided with a stepped platform for supporting the rotor and the rotor bracket. The cooling unit is disposed inside the positioning mandrel to prevent the positioning mandrel from heating up and expanding. The top extension assembly includes a top extension unit and a linear drive. The top extension unit is arranged around the positioning mandrel, and the output end of the linear drive is connected to the top extension unit so that the top extension rotor can disengage from the positioning mandrel.

[0006] Furthermore, the cooling unit includes a cooling cavity formed in the positioning mandrel, an input pipe for inputting coolant, and an output pipe for outputting coolant. The cooling cavity is arranged along the axial direction of the positioning mandrel. The input pipe is connected to the bottom of the cooling cavity, and the output pipe is connected to the top of the cooling cavity.

[0007] Furthermore, the cooling unit also includes a shut-off valve, which is connected to the output pipe. The shut-off valve can instantly cut off the water supply to the output pipe and use the water hammer effect to bombard the positioning mandrel.

[0008] Furthermore, the top extension unit includes a top extension ring and a transmission component. The top extension ring is arranged around the positioning mandrel, and the two ends of the transmission component are respectively connected to the top extension ring and the linear drive component.

[0009] Furthermore, the top extension unit also includes a drive disk connected to the linear drive member. The drive disk is coaxially arranged with the top extension ring, and a plurality of transmission members are equidistantly arranged around the top extension ring. The two ends of the transmission members are respectively fixedly connected to the drive disk and the top extension ring.

[0010] Furthermore, the positioning component also includes a stabilizing disk, the bottom of which is connected to the base, and the top of which is fixedly connected to the positioning spindle; the transmission component is slidably inserted into the stabilizing disk.

[0011] Furthermore, the transmission component is connected to the stabilizing disk via a linear bearing.

[0012] Furthermore, the positioning assembly also includes a pressure plate, which is disposed on the top of the positioning mandrel and is connected to the positioning mandrel by bolts.

[0013] Furthermore, the diameter of the stepped platform of the positioning mandrel is adapted to the inner diameter of the stator and the stator support, respectively.

[0014] Furthermore, the positioning mandrel is provided with a positioning key adapted to the stator and stator support, and the positioning key is fixedly connected to the positioning mandrel.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) An auxiliary device for rotor welding according to this utility model is provided with a positioning mandrel. The positioning mandrel is provided with a stepped platform for supporting the rotor and rotor support. The positioning mandrel can cooperate with the inner wall of the rotor and rotor support to achieve circumferential positioning of the rotor and rotor support. The ends of the stepped platform abut against the ends of the rotor and rotor support respectively to achieve axial positioning of the rotor and rotor support, so that the areas to be welded on the rotor and rotor support are connected to each other, which facilitates subsequent welding by the welding machine. The cooling unit is set inside the positioning mandrel. The cooling unit works continuously during the welding process, effectively suppressing the radial expansion of the positioning mandrel caused by heat, and ensuring that the workpiece and the tooling maintain the designed fit clearance during the ejection operation.

[0016] (2) An auxiliary device for rotor welding according to this utility model is provided with a lifting assembly, which includes a lifting unit and a linear drive. The lifting unit is arranged around the positioning mandrel, which can effectively avoid the workpiece skewing problem that may be caused by single-point ejection. The output end of the linear drive is connected to the lifting unit. The linear drive provides reliable ejection power. The linear drive can eject the rotor inserted in the positioning mandrel through the lifting unit, making the disassembly of the relatively heavy rotor easy and efficient. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the top extension unit in this utility model; Figure 3 This is a structural schematic diagram of the positioning component in this utility model.

[0018] In the diagram, 100 represents the base. 200. Positioning assembly; 210. Positioning mandrel; 211. Stepped platform; 212. Positioning key; 220. Cooling unit; 221. Cooling chamber; 222. Input pipe; 223. Output pipe; 230. Stabilizing plate; 240. Pressure plate; 300. Top extension assembly; 310. Top extension unit; 311. Top extension ring; 312. Transmission component; 313. Drive disc; 320. Linear drive component. Detailed Implementation

[0019] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0020] This embodiment discloses an auxiliary device for rotor welding, relating to the field of motor rotor welding technology. It utilizes a built-in cooling unit 220 to suppress thermal expansion and deformation of the positioning mandrel 210, thereby facilitating the separation of the welded rotor from the positioning mandrel 210. An extension assembly 300 is provided between the rotor and the positioning mandrel 210, enabling automatic ejection of the welded rotor, reducing the difficulty of detaching the rotor from the positioning mandrel 210, and improving production efficiency.

[0021] Please see Figures 1 to 3 This embodiment provides an auxiliary device for rotor welding, comprising: a base 100, a positioning component 200, and a lifting component 300. The base 100 can raise the entire auxiliary device and support the positioning component 200. The positioning component 200 can support and position the rotor and rotor support, ensuring they align at corresponding angles and positions. The positioning component 200 can also cool itself, preventing it from jamming the rotor due to thermal expansion.

[0022] The positioning assembly 200 includes a positioning mandrel 210 and a cooling unit 220. The bottom of the positioning mandrel 210 is connected to the base 100, so that the positioning mandrel 210 is kept vertical. This helps the rotor and rotor support to be inserted into the positioning mandrel 210 from the vertical direction, thereby adjusting the orientation of the rotor and rotor support and facilitating the end face docking and welding of the two.

[0023] The positioning mandrel 210 is provided with a stepped platform 211 for supporting the rotor and rotor support. The positioning mandrel 210 can cooperate with the inner wall of the rotor and rotor support to achieve circumferential positioning of the rotor and rotor support. The ends of the stepped platform 211 abut against the ends of the rotor and rotor support respectively to achieve axial positioning of the rotor and rotor support, so that the areas to be welded on the rotor and rotor support are connected to each other, which facilitates subsequent welding by the welding machine.

[0024] The cooling unit 220 is located inside the positioning mandrel 210. The cooling unit 220 works continuously during the welding process, effectively suppressing the radial expansion of the positioning mandrel 210 caused by heat, and ensuring that the workpiece and the tooling maintain the designed fit clearance during the ejection operation.

[0025] The ejection assembly 300 includes an ejection unit 310 and a linear drive 320. The ejection unit 310 is arranged around the positioning mandrel 210, which effectively avoids the workpiece skewing problem that may be caused by single-point ejection. The output end of the linear drive 320 is connected to the ejection unit 310. The linear drive provides reliable ejection power. The linear drive can eject the rotor inserted in the positioning mandrel 210 through the ejection unit 310, making the disassembly of the relatively heavy rotor easy and efficient.

[0026] During use, the rotor and rotor support are inserted into the positioning mandrel 210 sequentially. During welding, the rotor and support are precisely supported by the stepped platform 211 of the positioning mandrel 210. The cooling unit 220 continuously cools the positioning mandrel 210 to maintain the dimensional stability of the mandrel. After welding is completed, the linear drive 320 pushes the lifting unit 310 to move axially. A uniform lifting force is applied through the contact surface between the lifting ring 311 and the bottom of the rotor, causing the welded part to detach from the positioning mandrel 210 as a whole.

[0027] In some embodiments, please refer to Figure 3The cooling unit 220 includes a cooling cavity 221 formed in the positioning mandrel 210, an input pipe 222 for inputting coolant, and an output pipe 223 for outputting coolant. The cooling cavity 221 is arranged along the axial direction of the positioning mandrel 210. The input pipe 222 is connected to the bottom of the cooling cavity 221, and the output pipe 223 is connected to the top of the cooling cavity 221. Through the axially arranged cooling cavity 221 combined with the bottom-input and top-output pipe layout, the coolant forms a self-circulation under the combined effects of gravity and thermal convection, achieving uniform heat dissipation without additional power. The cooling unit 220 can continuously and stably reduce the temperature of the positioning mandrel 210, avoiding radial expansion deformation caused by high welding temperatures, thereby ensuring that the assembly gap between the rotor and the positioning mandrel 210 remains constant, allowing the rotor to be smoothly removed from the tooling after welding.

[0028] In specific implementation, the cooling chamber 221 is a hollow structure extending longitudinally inside the positioning mandrel 210, which can be formed by drilling. It is used to accommodate the flow of coolant and absorb the heat from the positioning mandrel 210. The input pipe 222 is a pipe connecting the external coolant supply equipment to the bottom of the cooling chamber 221. It can be implemented using a metal flexible hose or a rigid pipe, and is used to introduce low-temperature coolant into the cooling chamber 221. The output pipe 223 is a pipe connecting the top of the cooling chamber 221 to an external recovery device. It can be made of pressure-resistant material and is used to discharge the high-temperature coolant after absorbing heat. Preferably, the input pipe 222 is inserted into the cooling chamber 221, with the input end of the input pipe 222 positioned relative to the top of the cooling chamber 221, and the output end of the input pipe 222 protruding from the bottom of the cooling chamber 221. The input pipe 222 and the output pipe 223 are both located below the positioning mandrel 210, which can avoid interference between the pipe arrangement and the stator installation.

[0029] Specifically, coolant is injected from the bottom of cooling chamber 221 through inlet pipe 222, gradually filling the entire chamber under gravity. Since cooling chamber 221 extends along its axis, the coolant makes full contact with the inner wall of positioning mandrel 210 during flow, absorbing the heat generated during welding. The heated coolant has a lower density and flows upwards under natural convection, eventually being discharged through outlet pipe 223 at the top. This bottom-inlet, top-outlet design creates a continuous circulation, preventing coolant stagnation and resulting in localized temperature increases, thus effectively suppressing thermal expansion of positioning mandrel 210.

[0030] In some embodiments, the cooling unit 220 further includes a shut-off valve connected to the output pipe 223. The shut-off valve can instantly cut off the water supply to the output pipe 223, generating a directional impact by actively controlling the fluid flow. Utilizing the physical properties of the water hammer effect, this impact directly acts on the positioning mandrel 210, simultaneously generating a mechanical impact during the cooling process. The shock wave generated by the water hammer effect can both remove any impurities deposited within the cooling chamber 221 and reduce the frictional resistance between the rotor and the positioning mandrel 210 through high-frequency vibration, making the rotor demolding operation smoother. Simultaneously, this impact can offset some thermal expansion deformation, maintaining the stability of the gap between the positioning mandrel 210 and the rotor.

[0031] In practical implementation, a shut-off valve is a control component that can quickly block fluid flow. It can be implemented using a solenoid valve or a pneumatic valve, with the valve core being driven to close quickly by an electrical or pneumatic signal. The water hammer effect is a pressure fluctuation phenomenon caused by the sudden closure of a valve when fluid is flowing in a pipeline. Specifically, it manifests as a shock wave formed by the conversion of fluid kinetic energy into pressure energy, which can be transmitted along the pipeline to the interior of the positioning mandrel 210. During the welding process, coolant is continuously injected into the cooling chamber 221 through the inlet pipe 222, absorbing heat from the positioning mandrel 210 before being discharged through the outlet pipe 223. After welding is completed, when it is necessary to release the contact between the rotor and the positioning mandrel 210, the control system triggers the shut-off valve to completely close within milliseconds, instantly cutting off the flow of coolant in the outlet pipe 223. At this time, fluid inertia causes a high-pressure shock wave to form inside the outlet pipe 223. This shock wave is transmitted along the cooling chamber 221 to the inner wall of the positioning mandrel 210, generating high-frequency vibration energy. This vibration can disrupt the microscopic adhesion between the positioning mandrel 210 and the rotor contact surface, while the shock wave pressure can generate an axial impact force on the positioning mandrel 210.

[0032] In some embodiments, please refer to Figure 1 and Figure 2 The jacking unit 310 also includes a drive disk 313 connected to the linear drive component 320. The drive disk 313 is coaxially arranged with the jacking ring 311, and multiple transmission components 312 are equidistantly arranged around the jacking ring 311. The two ends of the transmission components 312 are fixedly connected to the drive disk 313 and the jacking ring 311, respectively. Through the combination of the drive disk 313 and the transmission components 312, the single-point driving force is converted into a multi-point uniform load, which simplifies the structure while improving the smoothness and reliability of the jacking action.

[0033] In practical implementation, the drive disc 313 is a disc-shaped structure connected to the output end of the linear drive component 320. It can be made of steel and is used to convert the linear motion of the linear drive component 320 into the synchronous lifting motion of the top extension ring 311. The rotation axes of the drive disc 313 and the top extension ring 311 coincide, which can be achieved by maintaining concentricity tolerance during machining to ensure consistent force transmission direction during the lifting process. The equidistant arrangement means that multiple transmission components 312 are evenly distributed along the circumference of the top extension ring 311. This can be achieved by symmetrically arranging three or six transmission components 312 to ensure uniform force distribution on the top extension ring 311 and avoid localized deformation. After the linear drive unit 320 is started, it drives the drive disk 313 to move along the axial direction. The drive disk 313 transmits the driving force synchronously to the top extension ring 311 through multiple circumferentially distributed transmission components 312. Under uniform force, the top extension ring 311 moves axially along the positioning spindle 210, thereby pushing the rotor to disengage from the positioning spindle 210. The coaxial design of the drive disk 313 and the top extension ring 311 ensures that the movement trajectory of the top extension ring 311 remains stable. The equidistant distribution of the transmission components 312 further eliminates the risk of off-center loading and avoids jamming or tilting problems caused by uneven force during the jacking process. In some embodiments, please refer to Figure 1 and Figure 2 The positioning assembly 200 also includes a stabilizing disk 230. The bottom of the stabilizing disk 230 is connected to the base 100, and the top of the stabilizing disk 230 is fixedly connected to the positioning spindle 210. The transmission component 312 is slidably inserted into the stabilizing disk 230. The sliding engagement between the stabilizing disk 230 and the transmission component 312 constrains the movement trajectory of the jacking assembly 300 and disperses the lateral pressure of the jacking load on the positioning spindle 210. Through the guiding effect of the stabilizing disk 230 on the transmission component 312, it is ensured that the jacking action always proceeds along the axial direction of the positioning spindle 210, significantly improving the smoothness of the rotor disengaging from the positioning spindle 210 and reducing the frictional loss between the positioning spindle 210 and the jacking assembly 300.

[0034] In practical implementation, the stabilizing disc 230 is a disc component with a planar support structure, which can be made of metal through machining. Its function is to provide a stable support base for the positioning mandrel 210 and prevent the positioning mandrel 210 from shifting during the extension process. The transmission rod passes through the guide hole reserved in the stabilizing disc 230 and maintains a sliding fit. It can be implemented using a linear bearing or a low-friction coating. Its function is to ensure that the extension action is carried out along the vertical axis by limiting the movement direction of the transmission component 312. The stabilizing disc 230 is fixed to the surface of the base 100 by bolts or welding, and the positioning spindle 210 is vertically fixed to the top of the stabilizing disc 230 by a flange or threaded connection. The transmission component 312 is a multi-rod structure, evenly distributed along the circumference of the stabilizing disc 230. Each transmission component 312 passes through a corresponding guide hole on the stabilizing disc 230 and forms a linkage with the top extension ring 311 and the drive disc 313. When the linear drive component 320 pushes the drive disc 313, the transmission component 312 slides in the guide hole of the stabilizing disc 230, evenly transmitting the driving force to the top extension ring 311, and avoiding tilting of the positioning spindle 210 due to uneven force.

[0035] It should be noted that the base 100 is a frame structure with a relatively open top, which does not interfere with the installation and movement of the stabilizing plate 230 and the top extension unit 310.

[0036] In some embodiments, please refer to Figure 1 and Figure 3 The positioning assembly 200 also includes a pressure plate 240, which is disposed on top of the positioning mandrel 210 and is connected to the positioning mandrel 210 by bolts. The pressure plate 240 can effectively suppress the axial displacement of the rotor and rotor support during welding, reduce assembly errors caused by welding deformation, and at the same time, the bolt connection enables quick assembly and disassembly of the pressure plate 240, adapting to the processing requirements of rotors of different sizes and improving the versatility of tooling and ease of maintenance.

[0037] In practical implementation, the pressure plate 240 is a plate-shaped structure used to apply pressure to the top of the positioning mandrel 210 to fix the rotor and rotor support. It can be implemented using a metal plate with through holes. Pressure is evenly transmitted to the rotor and rotor support via bolt connection, preventing positional displacement due to thermal expansion during welding. Threaded fasteners rigidly fix the pressure plate 240 to the positioning mandrel 210. High-strength alloy bolts with nuts can be used. The clamping force of the pressure plate 240 on the rotor and rotor support is controlled by adjusting the bolt preload, while also facilitating disassembly and reuse. A pressure plate 240 covers the top of the positioning mandrel 210, with its lower surface contacting the upper end faces of the rotor and rotor support. When a bolt passes through the through hole of the pressure plate 240 and is screwed into the threaded hole at the top of the positioning mandrel 210, the pressure plate 240 is pressed downward, thereby stably fixing the rotor and rotor support onto the stepped platform 211. During welding, the pressure plate 240 restricts the axial movement of the rotor and rotor support through rigid constraints, preventing misalignment due to thermal deformation. The bolted connection allows for quick removal of the pressure plate 240 after welding, providing operating space for the top extension assembly 300.

[0038] In some embodiments, please refer to Figure 3The diameter of the stepped platform 211 of the positioning mandrel 210 is adapted to the inner diameter of the stator and stator support, respectively. Through the layered adaptation design of the stepped platform 211, the inner holes of the rotor and rotor support are tightly fitted with the corresponding diameter stepped platform 211, eliminating positioning deviations caused by dimensional differences. The layered support structure of the stepped platform 211 disperses the pressure of the workpiece weight on the positioning mandrel 210, preventing local deformation from affecting positioning accuracy.

[0039] In practical implementation, the stepped platform 211 is an annular boss structure with different diameters set on the surface of the positioning mandrel 210. Specifically, it can be implemented using stepped shoulders or detachable annular sleeves, used to support the end faces of the rotor and rotor support in layers. The diameter of the stepped platform 211 forms a clearance fit or transition fit with the inner diameter of the rotor and rotor support, specifically using tolerance grades H7 / h6 or H8 / f7, ensuring that the rotor and rotor support maintain coaxiality with the positioning mandrel 210 during welding. The locating mandrel 210 has two stepped platforms 211. The diameter of the upper stepped platform 211 matches the inner diameter of the rotor, and the diameter of the lower stepped platform 211 matches the inner diameter of the rotor support. When the rotor and rotor support are sequentially fitted into the locating mandrel 210, their inner holes contact the cylindrical surfaces of the corresponding stepped platforms 211, forming radial constraints. During welding, the overlapping portion of the rotor and rotor support is axially limited by the stepped platforms 211, preventing relative displacement due to welding thermal deformation.

[0040] In some embodiments, please refer to Figure 3 The positioning mandrel 210 is equipped with a positioning key 212 adapted to the stator and stator support, and the positioning key 212 is fixedly connected to the positioning mandrel 210. Keyways are provided on the stator and stator support. Through the mechanical cooperation between the positioning key 212 and the keyways, automatic workpiece alignment is achieved, reducing manual intervention time. Maintaining a precise angular position between the stator and stator support during welding avoids rework problems caused by welding misalignment, and also reduces the resistance generated by circumferential friction during ejection and demolding, improving workpiece disassembly efficiency.

[0041] In practical implementation, the positioning key 212 is a raised structure on the surface of the positioning mandrel 210. It can be fixed to the positioning mandrel 210 by welding or bolting, and is used to restrict the circumferential rotation of the stator or stator support relative to the positioning mandrel 210. The fit is a clearance fit between the dimensions of the positioning key 212 and the keyway on the inner wall of the stator and stator support. Specifically, the clearance fit tolerance can be controlled within the range of 0.05-0.2 mm to ensure that the key and slot can be quickly aligned during stator and stator support installation. During the installation of the stator and stator support, the positioning key 212 is embedded in the corresponding keyway to form a circumferential constraint. Even if thermal expansion or external force occurs during the welding process, the stator and stator support will still maintain the preset angular position. When the ejector assembly 300 is activated, the fit between the positioning key 212 and the keyway can prevent the workpiece from rotating and rubbing against the positioning mandrel 210. The linear ejection force only needs to overcome the axial friction force to complete the demolding.

[0042] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the present utility model.

Claims

1. An auxiliary device for rotor welding, characterized in that, include: abutment; A positioning assembly includes a vertically arranged positioning mandrel and a cooling unit. The bottom of the positioning mandrel is connected to the base. The positioning mandrel is provided with a stepped platform for supporting the rotor and the rotor bracket. The cooling unit is disposed inside the positioning mandrel to prevent the positioning mandrel from heating up and expanding. The top extension assembly includes a top extension unit and a linear drive. The top extension unit is arranged around the positioning mandrel, and the output end of the linear drive is connected to the top extension unit so that the top extension rotor can disengage from the positioning mandrel.

2. The auxiliary device for rotor welding according to claim 1, characterized in that, The cooling unit includes a cooling cavity formed in the positioning mandrel, an input pipe for inputting coolant, and an output pipe for outputting coolant. The cooling cavity is arranged along the axial direction of the positioning mandrel. The input pipe is connected to the bottom of the cooling cavity, and the output pipe is connected to the top of the cooling cavity.

3. The auxiliary device for rotor welding according to claim 2, characterized in that, The cooling unit also includes a shut-off valve, which is connected to the output pipe. The shut-off valve can instantly cut off the water supply to the output pipe and use the water hammer effect to bombard the positioning mandrel.

4. The auxiliary device for rotor welding according to claim 1, characterized in that, The top extension unit includes a top extension ring and a transmission component. The top extension ring is arranged around the positioning mandrel, and the two ends of the transmission component are respectively connected to the top extension ring and the linear drive component.

5. The auxiliary device for rotor welding according to claim 4, characterized in that, The top extension unit also includes a drive disk connected to the linear drive member. The drive disk is coaxially arranged with the top extension ring. A plurality of transmission members are equidistantly arranged around the top extension ring. The two ends of the transmission members are fixedly connected to the drive disk and the top extension ring, respectively.

6. The auxiliary device for rotor welding according to claim 5, characterized in that, The positioning assembly also includes a stabilizing disk, the bottom of which is connected to the base, and the top of which is fixedly connected to the positioning spindle; the transmission component is slidably inserted into the stabilizing disk.

7. An auxiliary device for rotor welding according to claim 6, characterized in that, The transmission component is connected to the stabilizing disk via a linear bearing.

8. The auxiliary device for rotor welding according to claim 1, characterized in that, The positioning assembly also includes a pressure plate, which is disposed on the top of the positioning mandrel and is connected to the positioning mandrel by bolts.

9. An auxiliary device for rotor welding according to claim 1, characterized in that, The diameter of the stepped platform of the positioning mandrel is adapted to the inner diameter of the stator and the stator support, respectively.

10. An auxiliary device for rotor welding according to claim 1, characterized in that, The positioning mandrel is provided with a positioning key that is adapted to the stator and stator support, and the positioning key is fixedly connected to the positioning mandrel.

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