Stator welding system and method with tensioning function

Abstract

The invention provides a stator welding system and method with a tensioning function, and relates to the technical field of motor manufacturing, the system comprises a squirrel cage tensioning jig, a rotary driving mechanism, a lifting mechanism, an upper pressure head mechanism and a welding dust removal unit, according to the squirrel cage tensioning jig, arc-shaped tensioning modules distributed in the circumferential direction are synchronously driven by a driving module to move in the radial direction, a stator formed by splicing split iron cores is actively tensioned from the outer side, and the stator preforming function and the welding positioning function are integrated. Automatic feeding and discharging, tensioning, rotary welding and dust removal of the stator are achieved, the problems that a traditional welding mode is high in product tolerance requirement, tedious in procedure, poor in dust removal effect, prone to pipeline winding and the like are effectively solved, production efficiency and welding quality are remarkably improved, and compatibility of stators of different sizes is enhanced.

Description

Technical Field

[0001] This invention relates to the field of motor manufacturing technology, specifically to an automated welding system and method for welding motor stator cores. Background Technology

[0002] Motor stators are typically assembled and welded from multi-segment iron core frames. Currently widely used welding fixtures (commonly known as "squirrel cages") lack tensioning capabilities. The segmented stators must first be pre-formed in a pre-forming fixture before being pressed into the squirrel cage fixture for welding. This method places extremely high demands on the consistency of stator product tolerances and the machining precision of the squirrel cage fixture (e.g., tolerances, material, surface finish). When product tolerances are inconsistent, the pressing process becomes difficult, requiring the creation of corresponding squirrel cage fixtures for products with different tolerances, increasing fixture costs and management complexity (e.g., model identification). Furthermore, existing welding systems generally suffer from poor dust removal, cluttered wiring and water pipe layouts, and unstable pressing of the upper pressure head, leading to slippage and affecting equipment stability and product quality. Therefore, there is an urgent need for a stator welding solution that can adapt to product tolerances, has high integration, and a high degree of automation. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a stator welding system and method that can automatically tension, has strong compatibility, integrates dust removal and optimized layout.

[0004] This invention provides the following technical solution: A stator welding system and method with built-in tensioning function, comprising: A rat cage tensioning fixture is used to position and tension a stator made of segmented iron cores. A rotary drive mechanism, connected to the cage tensioning fixture, is used to drive its rotation; A lifting mechanism is used to support and lift the stator, so that the stator enters or leaves the cage tensioning fixture. The upper pressure head mechanism is located above the rat cage tensioning fixture and is used to press down the stator to position it. A welding dust removal unit includes at least one welding head and a corresponding dust removal device for suction and dust removal during welding. The cage tensioning fixture includes a transition cylinder fixed to the drive end of a rotary drive mechanism, a mandrel and an outer ring mounted on the transition cylinder, multiple arc-shaped tensioning modules circumferentially distributed around the mandrel, and a drive module for synchronously driving all the arc-shaped tensioning modules to move radially. The arc-shaped tensioning modules are guided and mounted on the outer ring, and are matched one-to-one with the segmented iron cores. The drive module is fixedly mounted on the transition cylinder. The stator formed by the segmented iron cores is distributed around the mandrel and the outer ring, and is radially positioned by the drive module pressing against the arc-shaped tensioning modules.

[0005] Therefore, the technical effects of this invention are mainly reflected in the system's integration, functional completeness, and fundamental technological breakthroughs, specifically including: Integration and Automation: This solution integrates five functional units—cage tensioning fixture, rotary drive, lifting, upper pressure head, and welding dust removal—into a collaborative system, achieving a fully automated process from stator placement to welding completion and ejection, significantly improving production efficiency. Fundamental technical improvement: The most core technical effect is that the cage tensioning fixture has its own tensioning function, which is in stark contrast to the two processes of preforming and then welding the cage mentioned in the background technology. This invention combines preforming and welding positioning into one, and drives multiple arc-shaped tensioning modules synchronously through the drive module to actively and radially tension the segmented iron core from the outside. This is a fundamental change in working mechanism. Improving product quality: By using the mandrel as a reference, all the segmented iron cores can be moved towards the center synchronously, which can effectively ensure the accuracy and roundness of the inner and outer diameters of the stator after welding, and solve the problem of non-roundness of the splicing caused by tolerance in the traditional method. Relaxing tolerance requirements: Since there is a gap between the fixture and the stator in the initial state, it is only used for angular positioning, making it easy to put the product in. The tensioning action is adaptive to the actual size of the product. Therefore, the tolerance consistency requirements for the segmented iron core are greatly reduced, which reduces the production troubles caused by product tolerance from the source.

[0006] Preferably, the arc-shaped tensioning module includes a positioning component, an arc-shaped component, and a guide component connected in sequence. The guide component passes radially through the outer ring component. The outer ring component also has an elastic element for pressing the guide component outward. The outer ring component also has a through groove along its circumference for a welding head to pass through for welding the product inside. The driving module includes a cylinder and a linkage mechanism installed outside the outer ring component. The linkage mechanism includes a rod body that is hinged to the outer ring component in the middle by a pin. One end of the rod body is hinged to the driving end of the cylinder, and the other end is provided with a roller for pressing against the outside of the guide component. The cylinder pushes the guide component to move along a radial track through the linkage mechanism, thereby causing the arc-shaped component to be pressed against the axial groove outside the corresponding segmented iron core by the positioning component.

[0007] The aforementioned technical benefits are reflected in the precision and reliability of the tensioning mechanism, as well as the advantages brought by its specific structure, namely: Synchronization and precision: The linkage mechanism is driven by a cylinder, and the roller at one end of the linkage mechanism presses against the guide. This mechanism design ensures that all 12 arc-shaped tensioning modules can move radially synchronously and smoothly, avoiding stator skew or uneven stress caused by sequential tensioning, thereby ensuring the coaxiality of the tensioning and the roundness of the stator. The buffering and resetting function of the elastic element: The elastic element (such as a spring) set in the outer ring provides outward top pressure to the guide. This design has a dual effect: First, when not in operation, it allows the tensioning module to automatically reset and maintain a gap with the product, making it easy to put in and take out; second, it provides a certain buffer during the tensioning process to avoid rigid impact damage to the product. Positioning accuracy: The curved part is precisely pressed against the axial groove outside the segmented iron core by the positioning part, realizing the combined radial and axial positioning, ensuring that each segment of the iron core will not move during the welding process, and the welding position is accurate; Facilitates welding operations: The through groove on the outer ring provides a clear working channel for the welding head, avoiding interference from the fixture structure in the welding process.

[0008] Preferably, it also includes a product placement tray for receiving the stator, the product placement tray being placed between the mandrel and the outer ring, and the bottom end being connected to a guide shaft, the guide shaft passing through the transition cylinder and connected to the driving end of the lifting mechanism.

[0009] The aforementioned technical effects are mainly reflected in the product's conveying and positioning, and its coordination with the fixture, specifically: Smooth product transport: The product placement tray provides a stable bearing platform for the assembled bulk stators. It is connected to the lifting mechanism through the guide shaft, ensuring that the tray moves smoothly and without shaking during the lifting process, and ensuring that the stators can accurately enter or leave the cage tensioning fixture. Precise positioning and fit: The pallet is placed between the mandrel and the outer ring, and its lifting stroke matches the height of the tensioning fixture. This design allows the stator to be accurately transported to the predetermined work position and to form an effective fit with the positioning component and the arc-shaped tensioning module, which is the key to realizing automated loading and unloading.

[0010] Preferably, the positioning element and the arc-shaped element are detachably installed via a dovetail groove structure to accommodate stators with different outer diameters.

[0011] This solution specifies the connection method between the positioning component and the curved surface component, and its technical effect directly points to the system's flexibility and economy, specifically: Enhanced compatibility and reduced costs: The dovetail groove design allows for detachable installation, enabling modular replacement of key positioning components. When welding stators with different outer diameters, only the corresponding positioning and arc-shaped components need to be replaced, eliminating the need to manufacture an entire new squirrel cage fixture. This greatly expands the application range of the equipment and significantly reduces fixture costs and management complexity caused by product model changes.

[0012] Preferably, the rotary drive mechanism is a hollow rotary platform mounted on a fixed platform. Hollow rotary platforms are existing technology and will not be described in detail here. The lifting mechanism includes a bottom servo cylinder mounted on the fixed platform and an air storage chamber mounted on the drive end of the bottom servo cylinder. A set of transmission tubes is sleeved inside the air storage chamber. The bottom end of the transmission tubes is connected to the air storage chamber, and the top end of the transmission tubes extends out of the transmission tubes and connects to the transition cylinder. The top end of the air storage chamber is also connected to the guide shaft through a set of slewing support bearings. That is, the outer ring of the slewing support bearings is connected to the air storage chamber, and the inner ring can be connected to the guide shaft. Therefore, when the hollow rotary platform drives the transition cylinder and the guide shaft to rotate, it will not affect the positioning of the bottom servo cylinder and the air storage chamber, thus preventing the air storage connector from rotating.

[0013] The technical advantages of this solution focus on resolving the problem of pipeline entanglement during rotation, specifically including: Achieving stable air supply during rotation: Through the combined design of a hollow rotating platform, air storage chamber, transmission pipe chamber and slewing support bearing, a fixed air source is creatively connected to the rotating fixture. The slewing support bearing is the key, as it allows the guide shaft and transition cylinder to rotate, while the air storage chamber at the bottom and the servo electric cylinder remain fixed, thus fundamentally avoiding the risk of air pipes getting tangled or twisted during equipment rotation. Simplified equipment structure and improved reliability: The gas circuit is highly integrated inside the equipment, with no messy external pipelines, making the equipment structure compact and neat, reducing failures caused by damage to external pipelines, and improving the long-term reliability of the equipment.

[0014] Preferably, the system also includes an integrated gas path assembly, which includes an intake channel located at the top of the transition cylinder and used for one-to-one gas path communication with the intake end of the cylinder. The intake channel is circumferentially distributed around the transition cylinder and corresponds to the channel openings evenly distributed around the circumference of the transmission chamber. The cylinder's outlet end is also provided with an exhaust valve, and a sealing ring for gas sealing is provided between the gas storage chamber and the transmission chamber. Therefore, the operation of the cylinder's gas path can be as follows: first, gas is charged into the gas storage chamber, and then the gas can simultaneously pass through the intake channel through the transmission chamber and enter all the cylinders. At this time, the exhaust valve is closed, and the cylinder's drive end can press the guide member through the rod under air pressure, thereby causing the guide member to move radially inward to achieve positioning and clamping of the inner segmented iron core, so as to realize the rotational welding of the stator. Since the intake connector is connected to the gas storage chamber, it will not cause the pipeline to wrap around during rotation, thereby achieving stable gas supply during rotation.

[0015] The technical advantages of this solution lie in the synchronization of gas supply and the optimization of control logic, specifically: Synchronous drive and centralized control: Through the annular air intake channel at the top of the transition cylinder, air is supplied to all 12 cylinders simultaneously. This means that the actions of all arc-shaped tensioning modules are strictly synchronized, ensuring the uniformity of tension force. The "one-way air intake, unified control" method simplifies the air circuit system and reduces control complexity. Efficient workflow: The pneumatic circuit working steps described in the solution are as follows: inflation, exhaust valve closure, tensioning, welding completion, exhaust valve opening, and release. This defines a clear and reliable control logic, ensuring the accurate execution of tensioning and releasing actions.

[0016] Preferably, the upper pressure head mechanism includes a top servo electric cylinder, a mounting plate, a transition plate, a clutch plate, a second rotary support bearing, a key block, a center positioning key, and spring pressure rods. The top side of the clutch plate is connected to the bottom side of the transition plate by multiple sets of circumferentially distributed spring elements. These spring elements can be a combination of guide rods and spring bodies, enabling the clutch plate and transition plate to be guided and connected while also allowing for elastic spacing through the spring bodies to ensure compression adjustment of the gap between the clutch plate and the transition plate. Multiple sets of spring pressure rods are fixed around the center of the bottom side of the clutch plate. A center positioning key is also fixed at the center of the clutch plate. The top of the mandrel is provided with a center positioning groove for engaging with the center positioning key. The spring pressure rods are used to press against the top of the segmented iron core one-to-one. The key block is a rotating block that is transitionally fitted to the center of the clutch plate, and a set of guide rods is fixed at the top of the key block. The guide rods pass through the center of the second rotary support bearing and are mounted inside the mounting plate, where they are pressed against by a compression spring within the mounting plate. To ensure the key block engages within the keyway of the transition plate, the drive end of the top servo electric cylinder is connected to the second rotary support bearing via a mounting plate. The transition plate and mounting plate are respectively mounted on the outer and inner rings of the second rotary support bearing. When the top servo electric cylinder drives the mounting plate, transition plate, key block, clutch plate, and spring rod to press down, the spring rod initially elastically presses against the top of the split iron core, and the center positioning key engages with the center positioning slot. Continuing to press down the spring rod allows the clutch plate to be pressed upwards, thus engaging the clutch. The gap between the plate and the transition plate disappears, and the key block in the center of the clutch plate disengages from the keyway of the transition plate. At this point, when the rotary drive mechanism drives the product to rotate, it can simultaneously drive the spring pressure rod, the center positioning key, the clutch plate, and the transition plate to rotate until the rotation reaches 180°, at which point the welding is completed. The top servo electric cylinder drives upward, and the key block can then engage with the keyway again. At this time, the clutch plate can once again move away from the mating plate under elastic pressure, and the position of the spring pressure rod can be repositioned by the engagement of the key block with the keyway.

[0017] The technical effect of this solution is to resolve the contradiction between the pressing of the upper pressure head and its follow-up rotation, specifically: Adaptive pressing and reliable follow-up: The use of 12 independent spring pressure rods can adapt to the slight height difference that may exist at the top of the segmented iron core, ensuring that the upper surface of each iron core can be pressed evenly, avoiding the uneven pressing problem that may be caused by the overall rigid pressure head; Innovative clutch mechanism: The core is the spring clutch design. When pressing down, it first achieves clamping; when pressing down further, the key block disengages from the keyway, allowing the pressure head to rotate synchronously with the stator. After welding is completed, the upper pressure head rises, and the key block automatically resets and locks into the keyway under the action of the pressure spring. This mechanism perfectly solves the technical problem of "both clamping and following". Precise positioning control: Through the cooperation of the center positioning key and the slot, and the engagement of the key block and the keyway at specific angles (such as 0° and 180°), it is ensured that the upper pressure head can only disengage or engage in the correct position, preventing the risk of misalignment and ensuring the accuracy of the starting and ending points of rotation.

[0018] Preferably, the mounting plate and the drive end of the top servo electric cylinder are also connected by a pressure sensor, which is used to sense the pressure value of the top servo electric cylinder pressing down. A proximity sensor is also provided on the transition plate, which is used to sense the gap between the transition plate and the clutch plate.

[0019] In this solution, the pressure sensor transforms the downward pressure from empirical judgment to precise numerical control, protecting the product from damage and ensuring consistent pressing quality. The proximity sensor monitors the gap between the clutch plate and the transition plate in real time, serving as a basis for judging whether the clutch state is normal. This effectively prevents equipment failure or product damage caused by the key block not properly disengaging or engaging, achieving intelligent error prevention. Furthermore, to improve the stability of stamping, the mounting plate can be guided and positioned on the end plate of the top servo electric cylinder via four sets of end side rods. At this time, the top servo electric cylinder is mounted on the base plate, and the end side plate is also guided and mounted on the base plate, thus ensuring the stability of stamping.

[0020] Preferably, the dust removal device includes a set of dust suction hoods installed outside the mounting plate and a bottom cover fixed to the drive end of the rotary drive mechanism. The dust suction hoods cover the spring pressure rod and are used to dock with the top of the bottom cover. The bottom cover covers the rat cage tensioning fixture and has a through groove on its side wall for the welding head to pass through.

[0021] The technical advantage of this solution lies in significantly improving dust removal efficiency, specifically including: High-efficiency sealed dust removal: The dust collection hood and the bottom cover are connected to form a relatively closed welding space, which confines the welding fumes to a local area. This hood design is much more efficient than open dust collection and can effectively prevent fumes from spreading into the equipment and workshop environment, protecting the precision of the fixture and the life of the equipment. Coordinating with welding operations: The design of the second through-slot allows welding head operations while minimizing the opening to maintain the airtightness of the dust removal space, reflecting a balance between functionality and reliability.

[0022] A stator welding method based on the above system includes the following steps: S1: Place the assembled segmented stator core into the product placement tray, and use the positioning components for initial positioning; S2: The lifting mechanism lowers the product placement tray, causing the stator to enter the cage tensioning fixture; S3: Drive module action, synchronously drive all arc-shaped tensioning modules to move radially inward, tensioning the stator from the outside; S4: The upper pressure head mechanism presses down to press the upper end face of the stator; S5: The rotary drive mechanism intermittently drives the squirrel cage tensioning fixture and stator to rotate according to the preset indexing angle. During the rotation pause, the welding head welds the stator joint, and the dust removal device works to remove dust at the same time. S6: After welding is completed, the drive module is reset, the arc tensioning module releases the stator, and the lifting mechanism drives the product placement tray to descend, pushing out the finished stator.

[0023] This plan defines the welding method and process, and its technical effect is to solidify the advantages of the aforementioned hardware innovations into the process, achieving efficient, high-quality, and standardized operations, specifically including: Process streamlining and standardization: This solution summarizes the entire welding process into standardized steps from S1 to S6, making the operation process clear and repeatable, and ensuring the stability of product quality. Optimize production efficiency: For example, in step S5, four welding heads evenly distributed in a circumferential direction can work simultaneously. The cage tensioning fixture pauses and performs welding every 15 degrees of rotation. After three rotations, a total of 12 seams are welded. The method described as "four welding heads working simultaneously", "pausing welding every 15 degrees of rotation", and "completing welding 12 seams in three rotations" is the optimal planning for the welding cycle. It makes full use of the equipment's hardware capabilities (four welding heads, rotation indexing) and shortens the total welding time to only three steps, greatly improving production efficiency.

[0024] The beneficial effects of this invention are: 1. High integration and full automation: The system organically integrates five major functional modules: cage tensioning fixture, rotary drive, lifting, upper pressure head, and welding dust removal. It realizes full-process automation from stator initial positioning, automatic tensioning, rotary welding to post-weld ejection, which significantly improves production efficiency and operational consistency. 2. Fundamental technological breakthrough and process simplification: The core technological effect lies in the active radial tensioning function of the squirrel cage tensioning fixture. This completely changes the traditional two-step method that requires first pressing the segmented stator in the pre-forming fixture and then installing it into the welded squirrel cage. This invention combines pre-forming and welding positioning into one. Through the drive module, multiple arc-shaped tensioning modules are driven synchronously to clamp the segmented iron core radially from the outside, simplifying the process and reducing equipment and material handling. 3. Significantly improve product quality and precision: By using the mandrel as a concentric reference, all the segmented iron cores move towards the center synchronously and evenly, which can effectively ensure the accuracy of the inner and outer diameter dimensions, roundness, and uniformity of the joints of the stator after welding. This solves the problems of non-roundness and stress concentration of the stator caused by tolerance or sequential tensioning in traditional methods. 4. Excellent product tolerance compatibility: Since there is a gap between the fixture and the stator in the initial state, the product is easy to put in. The tensioning action is an active behavior that adapts to the actual size of the product. Therefore, the tolerance consistency requirements of the segmented iron core itself are greatly reduced, which enhances the system's adaptability to product size fluctuations and reduces fixture incompatibility, product damage and production interruption caused by product tolerance. 5. Optimized dust removal effect and working environment: The integrated welding dust removal unit, especially the relatively enclosed space formed by the connection between the dust collection hood and the bottom cover, can efficiently collect welding fumes, prevent dust diffusion, protect the internal components of the equipment, and improve the workshop working environment; 6. Solving the problem of pipeline entanglement and optimizing the layout: Through the design of hollow rotating platform, slewing support bearing, integrated air circuit, etc., a reliable connection between rotating parts and fixed air source / drive parts is achieved, which fundamentally avoids the problem of air pipes and lines entanglement during equipment rotation, making the equipment structure more compact, the layout more neat, and improving long-term operational reliability. 7. Adaptive pressing and reliable follow-up of the upper pressure head: The upper pressure head mechanism adopts multiple independent spring pressure rods and an innovative clutch mechanism, which can both adaptively press the slight height difference that may exist at the top of the stator and achieve reliable follow-up rotation under the pressing state, thus solving the contradiction between "pressing" and "rotation" and ensuring the stability of the welding process. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a set of segmented iron cores; Figure 2 This is a schematic diagram of the stator structure composed of 12 groups of segmented iron cores; Figure 3 This is a schematic diagram of the main structure of the present invention. Figure 4 This is a cross-sectional view of the structure installed according to the present invention; Figure 5 This is a schematic diagram of the stator welding system of the present invention; Figure 6 This is a schematic cross-sectional view of the stator welding system of the present invention initially receiving the stator; Figure 7 This is a cross-sectional schematic diagram of the stator fully entering the stator welding system of the present invention; Figure 8 This is a structural schematic diagram of the outer ring component; Figure 9 This is a top view of the outer ring component with the stator built in. Figure 10 yes Figure 8Top view sectional view; Figure 11 This is a schematic diagram of the structure of the spring pressure rod pressing against the stator; Figure 12 This is a cross-sectional view of the spring-loaded rod connection structure; Figure 13 This is a schematic diagram of the upper pressure head mechanism installation; Figure 14 This is a structural cross-sectional view of the upper pressure head mechanism; Markings in the diagram: 1. Rat cage tensioning fixture; 2. Rotary drive mechanism; 3. Lifting mechanism; 4. Upper pressure head mechanism; 5. Welding head; 6. Dust removal device; 7. Channel opening; 8. Product placement tray; 9. Guide shaft; 10. Through slot one; 101. Through slot two; 102. Center positioning slot; 103. Split iron core; 104. Axial slot; 11. Transition cylinder; 12. Mandrel; 13. Outer ring; 14. Arc-shaped tensioning module; 15. Drive module; 16. Elastic element; 141. Positioning component; 142. Arc surface component; 143. Guide component; 151. Air... 152. Cylinder; 21. Linkage mechanism; 31. Hollow rotary platform; 32. Bottom servo electric cylinder; 33. Air storage chamber; 34. Transmission pipe chamber; 35. Rotary support bearing one; 46. Top servo electric cylinder; 47. Mounting plate; 48. Transition plate; 49. Clutch plate; 40. Spring pressure rod; 41. Center positioning key; 42. Key block; 43. Keyway; 44. Rotary support bearing two; 45. Pressure sensor; 46. Proximity sensor; 47. Spring component one; 48. Guide rod one; 49. Compression spring one; 60. Dust collection hood; 61. Bottom cover. Detailed Implementation

[0026] Example 1 like Figure 1-14 As shown, a stator welding system with built-in tensioning function, in this embodiment, includes a squirrel cage tensioning fixture 1, a rotary drive mechanism 2, a lifting mechanism 3, an upper pressure head mechanism 4, and a welding dust removal unit. The squirrel cage tensioning fixture 1 is used to position and tension the stator assembled from segmented iron cores 103; the rotary drive mechanism 2 is connected to the squirrel cage tensioning fixture 1 and is used to drive its rotation; the lifting mechanism 3 is used to carry and lift the stator, so that the stator enters or leaves the squirrel cage tensioning fixture 1; the upper pressure head mechanism 4 is disposed above the squirrel cage tensioning fixture 1 and is used to press down the stator to position it; the welding dust removal unit includes at least one welding head 5 and a corresponding dust removal device 6 for suction and dust removal during welding. The cage tensioning fixture 1 includes a transition cylinder 11 fixed to the drive end of the rotary drive mechanism 2, a core rod 12 and an outer ring 13 mounted on the transition cylinder 11, multiple arc-shaped tensioning modules 14 circumferentially distributed around the core rod 12, and a drive module 15 for synchronously driving all the arc-shaped tensioning modules 14 to move radially. The arc-shaped tensioning modules 14 are guided and mounted on the outer ring 13 and correspond one-to-one with the segmented iron cores 103. The drive module 15 is fixedly mounted on the transition cylinder 11. The stator formed by the segmented iron cores 103 is distributed around the core rod 12 and the outer ring 13, and the drive module 15 presses against the arc-shaped tensioning modules 14 for radial positioning.

[0027] Therefore, the technical effects of this invention are mainly reflected in the system's integration, functional completeness, and fundamental technological breakthroughs, specifically including: Integration and Automation: This solution integrates five functional units—squirrel cage tensioning fixture 1, rotary drive, lifting, upper pressure head, and welding dust removal—into a collaborative system, realizing a fully automated process from stator placement to welding completion and ejection, significantly improving production efficiency. Fundamental technical improvement: The most core technical effect is that the cage tensioning fixture 1 has a built-in tensioning function, which is in stark contrast to the two processes of preforming and then welding the cage mentioned in the background technology. This invention combines preforming and welding positioning into one, and drives multiple arc-shaped tensioning modules 14 synchronously through the drive module 15 to actively and radially tension the segmented iron core 103 from the outside. This is a fundamental change in working mechanism. Improving product quality: By using the mandrel 12 as a reference, all the segmented iron cores 103 can be moved towards the center synchronously, which can effectively ensure the accuracy and roundness of the inner and outer diameters of the stator after welding, and solve the problem of non-roundness of the splicing caused by tolerance in the traditional method. Relaxing tolerance requirements: Since there is a gap between the fixture and the stator in the initial state, it is only used for angular positioning, making it easy to put the product in. The tensioning action is adaptive to the actual size of the product. Therefore, the tolerance consistency requirements for the segmented iron core 103 are greatly reduced, reducing production problems caused by product tolerances from the source.

[0028] The arc-shaped tensioning module 14 includes a positioning component 141, an arc-shaped component 142, and a guide component 143 connected in sequence. The guide component 143 passes radially through the outer ring component 13. An elastic element 16 for pressing the guide component 143 outward is also provided inside the outer ring component 13. The outer ring component 13 also has a through groove 10 circumferentially for the welding head 5 to pass through for welding the product inside. The drive module 15 includes a cylinder 151 and a connecting rod installed outside the outer ring component 13. Mechanism 152, the linkage mechanism 152 includes a rod body that is hinged to the outer ring 13 at the middle via a pin. One end of the rod body is hinged to the drive end of the cylinder 151, and the other end is provided with a roller for pressing against the outside of the guide member 143. The cylinder 151 pushes the guide member 143 to move along the radial track through the linkage mechanism 152, thereby causing the arc surface member 142 to be pressed against the axial groove 104 outside the corresponding segmented iron core 103 by the positioning member 141.

[0029] The aforementioned technical benefits are reflected in the precision and reliability of the tensioning mechanism, as well as the advantages brought by its specific structure, namely: Synchronization and precision: The linkage mechanism 152 is driven by the cylinder 151, and the roller at one end of the linkage mechanism 152 presses against the guide 143. This mechanism design ensures that all 12 arc-shaped tensioning modules 14 can move radially synchronously and smoothly, avoiding stator skew or uneven stress caused by sequential tensioning, thereby ensuring the coaxiality of the tensioning and the roundness of the stator. The buffering and resetting function of the elastic element 16: The elastic element 16 (such as a spring) provided inside the outer ring 13 provides outward top pressure to the guide 143. This design has a dual effect: First, when not in operation, it allows the tensioning module to automatically reset and maintain a gap with the product, making it easy to insert and remove; second, it provides a certain buffer during the tensioning process to avoid rigid impact damage to the product. Positioning accuracy: The arc-shaped part 142 is precisely pressed against the axial groove 104 outside the segmented iron core 103 by the positioning part 141, realizing the combined radial and axial positioning, ensuring that each segment of the iron core will not move during the welding process, and the welding position is accurate. Facilitates welding operations: The through groove 10 on the outer ring 13 provides a clear working channel for the welding head 5, avoiding interference from the fixture structure on the welding process.

[0030] It also includes a product placement tray 8 for receiving the stator, the product placement tray 8 being placed between the core rod 12 and the outer ring 13, and the bottom end being connected to a guide shaft 9, the guide shaft 9 passing through the transition cylinder 11 and connected to the drive end of the lifting mechanism 3.

[0031] The aforementioned technical effects are mainly reflected in the product's conveying and positioning, and its coordination with the fixture, specifically: Smooth product transport: The product placement tray 8 provides a stable bearing platform for the assembled bulk stator. It is connected to the lifting mechanism 3 through the guide shaft 9, ensuring that the tray moves smoothly and without shaking during the lifting process, and ensuring that the stator can accurately enter or leave the cage tensioning fixture 1. Precise positioning and fit: The tray is placed between the mandrel 12 and the outer ring 13, and its lifting stroke matches the height of the tensioning fixture. This design enables the stator to be accurately transported to the predetermined work position and to form an effective fit with the positioning component 141 and the arc-shaped tensioning module 14, which is the key to realizing automated loading and unloading.

[0032] The positioning element 141 and the arc-shaped element 142 are detachably installed via a dovetail groove structure to accommodate stators with different outer diameters.

[0033] This solution specifies the connection method between the positioning component 141 and the curved surface component 142, and its technical effect directly points to the flexibility and economy of the system, specifically: Enhanced compatibility and reduced costs: The dovetail groove is used for detachable installation, which allows key positioning components to be replaced modularly. When it is necessary to weld stators with different outer diameters, only the corresponding positioning part 141 and arc surface part 142 need to be replaced. There is no need to make a whole new squirrel cage fixture. This greatly expands the application range of the equipment and significantly reduces the fixture cost and management complexity caused by product model changes.

[0034] The rotary drive mechanism 2 is a hollow rotary platform 21 installed on a fixed platform. The hollow rotary platform 21 is existing technology and will not be described in detail here. The lifting mechanism 3 includes a bottom servo electric cylinder 31 installed on the fixed platform and an air storage chamber 32 installed on the drive end of the bottom servo electric cylinder 31. A set of transmission tubes 33 are sleeved inside the air storage chamber 32. The bottom end of the transmission tubes 33 is connected to the air storage chamber 32, and the top end of the transmission tubes 33 extends out of the transmission tubes 33 and connects to the transition cylinder 11. The top end of the air storage chamber 32 is also connected to the guide shaft 9 through a set of slewing support bearings 34. That is, the outer ring of the slewing support bearings 34 is connected to the air storage chamber 32, and the inner ring can be connected to the guide shaft 9. Therefore, when the hollow rotary platform 21 drives the transition cylinder 11 and the guide shaft 9 to rotate, it will not affect the positioning of the bottom servo electric cylinder 31 and the air storage chamber 32, so that the air storage connector will not rotate.

[0035] The technical advantages of this solution focus on resolving the problem of pipeline entanglement during rotation, specifically including: Stable air supply during rotation: Through the combined design of hollow rotating platform 21, air storage chamber 32, transmission pipe 33 and slewing support bearing 34, the fixed air source is creatively connected to the rotating fixture. The slewing support bearing 34 is the key, as it allows the guide shaft 9 and transition cylinder 11 to rotate, while the bottom air storage chamber 32 and servo electric cylinder remain fixed, thus fundamentally avoiding the risk of air pipes getting tangled or twisted during equipment rotation. Simplified equipment structure and improved reliability: The gas circuit is highly integrated inside the equipment, with no messy external pipelines, making the equipment structure compact and neat, reducing failures caused by damage to external pipelines, and improving the long-term reliability of the equipment.

[0036] It also includes an integrated air circuit assembly, which includes an air intake channel located at the top of the transition cylinder 11 and used for one-to-one air circuit communication with the air intake end of the cylinder 151. The air intake channel is circumferentially distributed around the transition cylinder 11 and corresponds to the channel openings 7 evenly distributed around the circumference of the transmission chamber. The air outlet end of the cylinder 151 is also provided with an exhaust valve, and a sealing ring for gas sealing is provided between the air storage chamber 32 and the transmission chamber 33. Therefore, the air circuit operation of the cylinder 151 can be performed in the following steps: First Gas is introduced into the gas storage chamber 32, and the gas can then pass through the transmission pipe 33 and enter all the cylinders 151 simultaneously through the air intake channel. At this time, the exhaust valve is closed, and the drive end of the cylinder 151 can press the guide member 143 through the rod under the air pressure, thereby causing the guide member 143 to move radially inward to achieve positioning and clamping of the inner segmented iron core 103, so as to realize the rotational welding of the stator. Since the air intake connector is connected to the gas storage chamber 32, the pipeline will not be tangled during rotation, thus achieving stable air supply during the rotation process.

[0037] The technical advantages of this solution lie in the synchronization of gas supply and the optimization of control logic, specifically: Synchronous drive and centralized control: Through the annular air intake channel at the top of the transition cylinder 11, air is supplied to all 12 cylinders 151 at the same time. This means that the actions of all arc-shaped tensioning modules 14 are strictly synchronized, ensuring the uniformity of tension force. The "one-way air intake, unified control" method simplifies the air circuit system and reduces the control complexity. Efficient workflow: The pneumatic circuit working steps described in the solution are as follows: inflation, exhaust valve closure, tensioning, welding completion, exhaust valve opening, and release. This defines a clear and reliable control logic, ensuring the accurate execution of tensioning and releasing actions.

[0038] The upper pressure head mechanism 4 includes a top servo electric cylinder 41, a mounting plate 42, a transition plate 43, a clutch plate 44, a second rotary support bearing 49, a key block 47, a center positioning key 46, and a spring pressure rod 45. The top side of the clutch plate 44 is connected to the bottom side of the transition plate 43 by multiple sets of circumferentially distributed spring elements 412. The spring element 412 can be a combination of a guide rod and a spring body, so as to achieve a guiding connection between the clutch plate 44 and the transition plate 43, while also allowing the spring body to elastically space between them to ensure the compression adjustment of the gap between the clutch plate 44 and the transition plate 43. The bottom side of the clutch plate 44 surrounds the center. Multiple sets of spring-loaded rods 45 are fixed. A set of center positioning keys 46 is also fixed at the center of the clutch plate 44. The top of the core rod 12 is also provided with a center positioning groove 102 for engaging with the center positioning keys 46. The spring-loaded rods 45 are used to press against the top of the split iron core 103 one by one. The key block 47 is rotatably fitted outside the rotating block at the center of the clutch plate 44, and a set of guide rods 413 is fixed at the top of the key block 47. The guide rods 413 are installed in the mounting plate 42 through the center guide of the slewing support bearing 49, and are pressed by the compression springs 414 in the mounting plate 42 to make the key block... 47 is snapped into the keyway 48 of the transition plate 43. The drive end of the top servo electric cylinder 41 is connected to the second slewing support bearing 49 through the mounting plate 42. The transition plate 43 and the mounting plate 42 are respectively installed on the outer ring and inner ring of the second slewing support bearing 49. When the top servo electric cylinder 41 drives the mounting plate 42, transition plate 43, key block 47, clutch plate 44, and spring rod 45 to press down, the spring rod 45 first elastically presses against the top of the split iron core 103, and the center positioning key 46 is engaged with the center positioning groove 102. Continuing to press down the spring rod 45 can push the clutch plate 44 upward to make the position... When the gap between the clutch plate 44 and the transition plate 43 disappears, the key block 47 at the center of the clutch plate 44 disengages from the keyway 48 of the transition plate 43. At this point, when the rotary drive mechanism 2 drives the product to rotate, it can synchronously drive the spring pressure rod 45, the center positioning key 46, the clutch plate 44, and the transition plate 43 to rotate until the rotation reaches 180°, at which point the welding is completed. The top servo electric cylinder 41 drives upward, and the key block 47 can then engage with the keyway 48 again. At this time, the clutch plate 44 can once again move away from the mating plate under elastic pressure, and the position of the spring pressure rod 45 can be positioned again by the engagement of the key block 47 with the keyway 48.

[0039] The technical effect of this solution is to resolve the contradiction between the pressing of the upper pressure head and its follow-up rotation, specifically: Adaptive pressing and reliable follow-up: The use of 12 independent spring pressure rods 45 can adapt to the slight height difference that may exist at the top of the segmented iron core 103, ensuring that the upper surface of each iron core can be pressed evenly, avoiding the uneven pressing problem that may be caused by the overall rigid pressure head; The innovative clutch mechanism is the core of the spring clutch design. When pressing down, it first achieves clamping; when pressing down further, the key block 47 disengages from the keyway 48, allowing the pressure head to rotate synchronously with the stator. After welding is completed, the upper pressure head rises, and the key block 47 automatically resets and locks into the keyway 48 under the action of the compression spring 414. This mechanism perfectly solves the technical problem of "both clamping and following". Precise positioning control: Through the cooperation of the center positioning key 46 with the slot, and the engagement of the key block 47 and the keyway 48 at specific angles (such as 0° and 180°), it is ensured that the upper pressure head can only disengage or engage in the correct position, preventing the risk of misalignment and ensuring the accuracy of the starting and ending points of rotation.

[0040] The mounting plate 42 and the drive end of the top servo electric cylinder 41 are also connected by a pressure sensor 410. The pressure sensor 410 is used to sense the pressure value of the top servo electric cylinder 41 pressing down. A proximity sensor 411 is also provided on the transition plate 43. The proximity sensor 411 is used to sense the gap between the transition plate 43 and the clutch plate 44.

[0041] In this scheme, the pressure sensor 410 transforms the downward pressure from empirical judgment to precise numerical control, protecting the product from damage and ensuring the consistency of pressing quality. The proximity sensor 411 monitors the gap between the clutch plate 44 and the transition plate 43 in real time, serving as the basis for judging whether the clutch state is normal. This effectively prevents equipment failure or product damage caused by the key block 47 not properly disengaging or engaging, achieving intelligent error prevention. Furthermore, to improve the stability of stamping, the mounting plate 42 can be guided and positioned on the end side plate of the top servo cylinder 41 by four sets of end side rods. At this time, the top servo cylinder 41 is mounted on the base plate, and the end side plate is also guided and mounted on the base plate, thus ensuring the stability of stamping.

[0042] The dust removal device 6 includes a set of dust suction hoods 61 installed outside the mounting plate 42 and a bottom cover 62 fixed to the drive end of the rotary drive mechanism 2. The dust suction hoods 61 cover the spring pressure rod 45 and are used to connect with the top of the bottom cover 62. The bottom cover 62 covers the rat cage tensioning fixture 1 and has a through groove 101 on its side wall for the welding head 5 to pass through.

[0043] The technical advantage of this solution lies in significantly improving dust removal efficiency, specifically including: High-efficiency sealed dust removal: The dust collection hood 61 and the bottom cover 62 are connected to form a relatively closed welding space, which confines the welding fumes to a local area. This hood design is much more efficient than open dust collection and can effectively prevent fumes from spreading into the equipment and workshop environment, protecting the precision of the fixture and the life of the equipment. Coordination with welding operations: The design of through-slot 2 101 allows welding head 5 to operate while minimizing the opening to maintain the airtightness of the dust removal space, reflecting a balance between functionality and reliability.

[0044] Example 2 A stator welding method based on the above system includes the following steps: S1: Place the assembled segmented stator core into the product placement tray 8, and perform initial positioning by the positioning component 141; S2: The lifting mechanism 3 drives the product placement tray 8 to descend, so that the stator enters the rat cage tension fixture 1; S3: Drive module 15 operates, synchronously driving all arc-shaped tensioning modules 14 to move radially inward, tensioning the stator from the outside; S4: The upper pressure head mechanism 4 presses down to press the upper end face of the stator; S5: The rotary drive mechanism 2 intermittently drives the squirrel cage tensioning fixture 1 and the stator to rotate according to the preset indexing angle. During the rotation pause, the welding head 5 welds the stator joint, and at the same time, the dust removal device 6 works to remove dust. S6: After welding is completed, the drive module 15 is reset, the arc tensioning module 14 releases the stator, and the lifting mechanism 3 drives the product placement tray 8 to descend, pushing out the finished stator.

[0045] This plan defines the welding method and process, and its technical effect is to solidify the advantages of the aforementioned hardware innovations into the process, achieving efficient, high-quality, and standardized operations, specifically including: Process streamlining and standardization: This solution summarizes the entire welding process into standardized steps from S1 to S6, making the operation process clear and repeatable, and ensuring the stability of product quality. Optimize production efficiency: For example, in step S5, four welding heads 5 can be evenly distributed in a circumferential direction and operate simultaneously. The cage tensioning fixture 1 pauses and performs welding every 15 degrees of rotation. After three rotations, a total of 12 seams are welded. The method described as "four welding heads 5 operating simultaneously", "pausing welding every 15 degrees of rotation", and "completing welding 12 seams in three rotations" is the optimal planning for the welding cycle. It makes full use of the equipment's hardware capabilities (four welding heads, rotation indexing) and shortens the total welding time to only three steps, greatly improving production efficiency.

[0046] The working principle of this invention is: In this invention, the process of stator positioning and tensioning is as follows: First, the assembled segmented stator core is placed on the product placement tray 8. It is initially positioned by the positioning component 141 in the cage tensioning fixture 1. Then, the lifting mechanism 3 drives the tray to descend, allowing the stator to enter the fixture. The drive module 15, i.e., the cylinder 151 and the linkage mechanism 152, simultaneously push all the arc-shaped tensioning modules 14 to move radially inward. The arc surface component 142 presses against the outer wall of the segmented core 103, causing it to move towards the center with the core rod 12 as the reference, eliminating the splicing gap. The process of rotary welding and dust removal is as follows: First, the upper pressure head mechanism 4 presses down, and the spring pressure rod 45 elastically abuts against the upper end face of the stator. The pressure sensor 410 controls the downward pressure. After the center positioning key 46 engages with the center positioning groove 102, continuously pressing down the spring pressure rod 45 will push the clutch plate 44 upward, causing the gap between the clutch plate 44 and the transition plate 43 to disappear. Then, the key block 47 in the center of the clutch plate 44 disengages from the keyway 48 of the transition plate 43. At this point, when the rotary drive mechanism 2 drives the product to rotate, it can synchronously drive the spring pressure rod 45, the center positioning key 46, the clutch plate 44, and the transition plate 43 to rotate until the product rotates. When the rotation reaches 180°, the welding is completed. The top servo cylinder 41 drives the upward movement, and the key block 47 can once again engage with the keyway 48. At this time, the clutch plate 44 can once again move away from the mating plate under the elastic pressure. The position of the spring pressure rod 45 can be positioned again by the engagement of the key block 47 with the keyway 48. The rotary drive mechanism 2 drives the squirrel cage fixture and stator to rotate step by step (e.g., 15° each time). One, two, or four welding heads 5 simultaneously perform laser welding on the joint. The dust collection hood 61 of the dust removal device 6 is connected to the bottom cover 62, and the welding fumes are efficiently collected by positive pressure to reverse pressure suction.

[0047] The specific details regarding the gas path and wiring integration are as follows: The air supply is uniformly supplied through the annular air intake channel inside the transition cylinder 11 to avoid the pipeline from getting tangled during rotation; the slewing support bearing in the lifting mechanism 3 ensures that the air supply is sealed and does not move, while the welding machine lines and water pipes can be centrally laid out from the cable tray on the top of the equipment. They are independent of the rotating welding fixture system in this invention, which also facilitates maintenance and inspection.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stator welding system with a built-in tensioning function, characterized in that, The utility model relates to a kind of welding device for the stator of motor, including: Mouse cage tensioning fixture, for positioning and tensioning by split core stator made of piece; Rotary drive mechanism, connected with the mouse cage tensioning fixture, for driving its rotation; Lifting mechanism, for carrying and lifting stator, so that stator enters or leaves the mouse cage tensioning fixture; Upper pressure head mechanism, arranged above the mouse cage tensioning fixture, for pressing stator to make it position; Welding dust removal unit, including at least one welding head and corresponding dust removal device for suctioning dust during welding; Wherein, the mouse cage tensioning fixture includes a transition cylinder body fixed on the driving end of the rotary drive mechanism, a core rod and an outer ring member mounted on the transition cylinder body, a plurality of circumferentially distributed arc-shaped tensioning modules around the core rod, and a driving module for synchronously driving all the arc-shaped tensioning modules to move radially, the arc-shaped tensioning modules are guidedly mounted on the outer ring member and correspond one-to-one with the split core, and the driving module is fixedly mounted on the transition cylinder body, the stator made of split core is circumferentially distributed between the core rod and the outer ring member, and is positioned radially by the driving module pressing the arc-shaped tensioning module.

2. A stator welding system with self-tensioning according to claim 1, characterized in that The arc-shaped tensioning module includes a positioning member, an arc surface member and a guide member connected in sequence, the guide member penetrates the outer ring member along the radial direction, the outer ring member further has a resilient element arranged therein for pressing the guide member outward, and the outer ring member is further provided with a through slot one along the circumferential direction for the welding head to penetrate to weld the product inside the outer ring member;The driving module includes a gas cylinder mounted outside the outer ring member and a connecting rod mechanism, the connecting rod mechanism includes a rod body hingedly mounted outside the outer ring member through a pin shaft, one end of the rod body is hingedly mounted on the driving end of the gas cylinder, and the other end is provided with a roller for pressing the guide member outside, the gas cylinder drives the guide member to move along the radial track through the connecting rod mechanism, so that the arc surface member is abutted to the corresponding axial clamping groove outside the split core through the positioning member.

3. A self-tensioning stator welding system as defined in claim 2, wherein, It further includes a product placement tray for receiving the stator, the product placement tray is placed between the core rod and the outer ring member, and the bottom end is connected to a guide shaft, the guide shaft penetrates the transition cylinder body and is connected to the driving end of the lifting mechanism.

4. The self-tensioning stator welding system of claim 3, wherein, The positioning member and the arc surface member are detachably mounted through dovetail groove structure to be compatible with stators of different outer diameters.

5. The self-tensioning stator welding system of claim 3, wherein, The rotary drive mechanism is a hollow rotary platform mounted on a fixed table body, the lifting mechanism includes a bottom servo cylinder mounted on the fixed table body and a gas storage cavity mounted on the driving end of the bottom servo cylinder, a group of transmission tube cavities are sleeved and mounted in the gas storage cavity, the bottom end of the transmission tube cavity communicates with the gas storage cavity, the top end of the transmission tube cavity penetrates the transmission tube cavity and is connected to the transition cylinder body, and the top end of the gas storage cavity is connected to the guide shaft through a group of rotary support bearings one.

6. The self-tensioning stator welding system of claim 3, wherein, Further comprising a gas path integrated assembly, the gas path integrated assembly comprising an air inlet channel arranged at the top end of the transition cylinder body and used for one-to-one air path communication with the air inlet end of the cylinder, the air inlet channel being distributed in the circumferential direction of the transition cylinder body and being in communication with the channel openings uniformly distributed in the circumferential direction of the transmission cavity, the air outlet end of the cylinder being further provided with an exhaust valve, and a sealing ring being further arranged between the gas storage cavity and the transmission cavity for realizing gas sealing.

7. The self-tensioning stator welding system of claim 1, wherein, The upper pressing head mechanism comprises a top servo cylinder, a mounting plate, a transition plate, a clutch plate, a rotary support bearing II, a key block, a center positioning key, and a spring pressing rod. The top side of the clutch plate is connected to the bottom side of the transition plate through a plurality of circumferentially distributed spring members. The bottom side of the clutch plate is fixed with a plurality of spring pressing rods around the center. The center of the clutch plate is further fixed with a set of center positioning keys. The top end of the core rod is further provided with a center positioning groove for clamping cooperation with the center positioning keys. The spring pressing rod is used to press one-to-one on the top end of the split core. The key block is a rotary block matched at the center of the clutch plate. The top end of the key block is fixed with a set of guide rods I. The guide rod I is centrally guided through the rotary support bearing II and is installed in the mounting plate. The key block is clamped in the key groove of the transition plate through the compression spring I in the mounting plate. The driving end of the top servo cylinder is connected to the rotary support bearing II through the mounting plate. The transition plate and the mounting plate are correspondingly installed on the outer ring and the inner ring of the rotary support bearing II.

8. A self-tensioning stator welding system as defined in claim 7, wherein, A pressure sensor is further connected between the mounting plate and the driving end of the top servo cylinder. The pressure sensor is used to sense the pressure value of the top servo cylinder. A proximity sensor is further arranged on the transition plate. The proximity sensor is used to sense the gap between the transition plate and the clutch plate.

9. The self-tensioning stator welding system of claim 7, wherein, The dust removal device comprises a set of dust suction covers mounted outside the mounting plate and a bottom cover fixed to the driving end of the rotary driving mechanism. The dust suction cover is arranged outside the spring pressing rod and is used to butt joint with the top end of the bottom cover. The bottom cover is arranged outside the squirrel cage tensioning jig, and the side wall is provided with a through groove II for the welding head to pass through.

10. A method of welding a stator based on the system of any one of claims 1-9, characterized by, The method comprises the following steps: S1: Put the split stator core after splicing into the product placing tray, and preliminarily position by the positioning member; S2: The lifting mechanism drives the product placing tray to descend, so that the stator enters the squirrel cage tensioning jig; S3: The driving module is actuated to synchronously drive all arc-shaped tensioning modules to move radially inward, thereby tensioning the stator from the outside; S4: The upper pressing head mechanism is pressed downward to press the upper end surface of the stator; S5: The rotary driving mechanism intermittently drives the squirrel cage tensioning jig and the stator to rotate at a preset division angle, and the welding head welds the stator joint during rotation pause, while the dust removal device works to remove dust; S6: After welding is completed, the driving module is reset, the arc-shaped tensioning module releases the stator, and the lifting mechanism drives the product placing tray to descend to eject the finished product stator.

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