Motor stator core welding device and manufacturing method

Abstract

The invention relates to the technical field of welding devices, in particular to a motor stator iron core welding device and a manufacturing method.The motor stator iron core welding device comprises a support, a limiting straight rod, a guide rod and a driving part, a plurality of silicon steel sheets are placed on the support, and under the action of a first clamp and a second clamp, the silicon steel sheets are welded to the support; the plurality of silicon steel sheets cannot move in the axial direction and the radial direction, in the state, the limiting straight rod is inserted into the welding grooves of the plurality of silicon steel sheets at the same time, the plurality of silicon steel sheets are twisted by the first driving source in the driving part, and the limiting straight rod and the guide rod alternately move in the welding grooves under the action of the second driving part in the driving part; when the guide rods enter the welding grooves, every two adjacent silicon steel sheets rotate relatively, so that the welding grooves of the multiple silicon steel sheets are in a spiral shape, the spiral lines of the welding grooves become regular under the action of the guide rods, and therefore the motor manufacturing quality and efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding devices, and in particular to a motor stator core welding device and a manufacturing method thereof. Background Art

[0002] A welding device is a device used to weld workpieces, usually including a welding machine, a welding gun or welding head, a power supply device, a control system and other components. The selection of a welding device depends on the material of the workpiece, the welding method and the required welding quality.

[0003] The stator core of the motor is made of multiple silicon steel sheets stacked together, and the connection methods between the multiple silicon steel sheets are usually riveting, bonding and welding. When the silicon steel sheets of the stator core are connected by welding, it is necessary to set welds on the silicon steel sheets. For permanent magnet synchronous motors, the silicon steel sheets in the stator core need to be spirally stacked together, so the weld also presents a spiral shape. However, when processing such a stator core, it is usually necessary to twist the stator core with the weld in a vertical state first, so that the weld presents a spiral state. However, when twisting the stator core, the rotation angles between two adjacent silicon steel sheets may be inconsistent, resulting in irregular spiral lines of the weld, which affects the quality and efficiency of motor manufacturing. Summary of the invention

[0004] The invention provides a motor stator core welding device and a manufacturing method to solve the problem that the existing welding device affects the quality of the manufactured motor.

[0005] A motor stator core welding device and manufacturing method of the present invention adopts the following technical solutions: A motor stator core welding device comprises a bracket, a limiting straight rod, a guide rod and a driving member.

[0006] A first clamp is provided on the bracket, and the first clamp can clamp multiple silicon steel sheets in a coaxial state, and the first clamp can limit the movement of the silicon steel sheets in its own radial direction; a second clamp is provided on the bracket, and the second clamp can limit the movement of the multiple silicon steel sheets in its own axial direction; the limiting straight rod can be inserted into the welding grooves of the multiple silicon steel sheets; the guide rod is set in a spiral shape, the guide rod can slide on the bracket, the guide rod can abut against the limiting straight rod, and the guide rod can enter the welding groove of the silicon steel sheet; the driving member includes a first driving source and a second driving source, the first driving source is used to twist the multiple silicon steel sheets, and the second driving source is used to drive the limiting straight rod and the guide rod to slide alternately in the welding groove when twisting the multiple silicon steel sheets.

[0007] Furthermore, the first clamp includes a support plate and a plurality of expansion arc plates. The support plate is arranged on a bracket. A plurality of guide grooves are arranged on the support plate. The plurality of guide grooves are evenly distributed along the circumference of the support plate, and each guide groove is arranged along the radial direction of the support plate; each expansion arc plate is slidably arranged along a guide groove, and the plurality of expansion arc plates can approach or move away from the axis of the support plate at the same time.

[0008] Furthermore, the second clamp includes an extrusion ring and a driving cylinder, the driving cylinder having a fixed end and a telescopic end, the fixed end of the driving cylinder is fixedly arranged on the bracket, and the telescopic end of the driving cylinder is arranged close to the support plate; the extrusion ring is fixedly arranged at the telescopic end of the driving cylinder, and the driving cylinder can drive the extrusion ring to contact the silicon steel sheet.

[0009] Furthermore, the first driving source includes a driving cylinder and a first motor. The driving cylinder is coaxially fixedly connected to the support plate, the driving cylinder is rotatably connected to the bracket, and the first motor is used to drive the driving cylinder to rotate.

[0010] Furthermore, the second driving source includes a driving sleeve and a second motor. The driving sleeve is coaxially rotatably sleeved on the outside of the driving cylinder. The second motor is used to drive the driving sleeve to rotate. A guide member is arranged in the driving sleeve. When the driving sleeve and the driving cylinder rotate relative to each other, the guide member guides the guide rod.

[0011] Furthermore, the guide member includes a guide rail and a guide block. The guide rail is arranged on the inner side wall of the driving sleeve. The guide rail is parallel to the axis of the driving sleeve. The guide block is fixedly arranged at one end of the guide rod away from the extrusion ring. The guide block can slide along the guide rail.

[0012] Furthermore, the second driving source also includes a driving rack, a third motor and a driving gear; the driving rack is fixedly connected to the limiting straight rod, the third motor is arranged on the extrusion ring, the driving gear is connected to the power output shaft of the third motor, and the driving gear is meshed with the driving rack.

[0013] Furthermore, a convex block is arranged on one end of the limiting straight rod close to the supporting plate, and a concave block is arranged on one end of the guiding rod close to the extrusion ring, and the convex block and the concave block can fit with each other.

[0014] Furthermore, a guide rod is arranged on the bracket, the guide rod is parallel to the axis of the support plate, a manipulator capable of sliding along the guide rod is arranged on the guide rod, and a welding head is arranged on the manipulator.

[0015] A method for manufacturing a motor stator core, using any one of the motor stator core welding devices described above, comprises the following steps: S100: placing a plurality of silicon steel sheets on a bracket; S200: clamping a plurality of silicon steel sheets using a first clamp and a second clamp; S300: inserting the limit straight rod into the welding grooves of multiple silicon steel sheets at the same time; S400: controlling the first driving source to twist the plurality of silicon steel sheets; S500: Control the second driving source to cause the limiting straight rod and the guide rod to slide alternately in the welding groove of the silicon steel sheet.

[0016] The beneficial effects of the present invention are as follows: a motor stator core welding device and a manufacturing method of the present invention, wherein the motor stator core welding device includes a bracket, a limiting straight rod, a guide rod and a driving member. When the core is manufactured, a plurality of silicon steel sheets are placed on the bracket. Under the action of a first clamp and a second clamp on the bracket, the plurality of silicon steel sheets are in a coaxial state, the plurality of silicon steel sheets will not move axially, and the plurality of silicon steel sheets will not move radially. In this state, the limiting straight rod is simultaneously inserted into the welding grooves of the plurality of silicon steel sheets, the first driving source in the driving member twists the plurality of silicon steel sheets, and under the action of a second driving member in the driving member, the limiting straight rod and the guide rod move alternately in the welding groove. When the guide rod enters the welding groove, two adjacent silicon steel sheets rotate relative to each other, so that the welding grooves of the plurality of silicon steel sheets are spirally shaped. Under the action of the guide rod, the spiral lines of the welding grooves become regular, thereby improving the quality and efficiency of motor manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic structural diagram of a motor stator core welding device provided by an embodiment of the present invention; Figure 2 A side view of a motor stator core welding device provided by an embodiment of the present invention; Figure 3 A front view of a motor stator core welding device provided by an embodiment of the present invention; Figure 4 for Figure 3 Sectional view in the AA direction; Figure 5 A state diagram of a guide rod and a limit straight rod in a motor stator core welding device provided by an embodiment of the present invention being both in a welding groove; Figure 6 for Figure 5 A side view of the state shown; Figure 7 for Figure 6 A partial enlarged view of point B in the middle; Figure 8 An exploded view of the structure of a motor stator core welding device provided by an embodiment of the present invention with the bracket hidden; Fig. 9 A schematic diagram of the structure of a driving cylinder and an extrusion ring in a motor stator core welding device provided by an embodiment of the present invention; Fig.10 A schematic structural diagram of a limit straight rod and a driving rack in a motor stator core welding device provided by an embodiment of the present invention; Fig.11 A schematic structural diagram of a guide rod in a motor stator core welding device provided by an embodiment of the present invention; Fig.12 A schematic structural diagram of a manipulator and a welding head in a motor stator core welding device provided in an embodiment of the present invention.

[0019] In the figure: 110, bracket; 120, silicon steel sheet; 130, limit straight rod; 140, guide rod; 150, support plate; 160, expansion arc plate; 170, extrusion ring; 180, drive cylinder; 210, drive cylinder; 220, first motor; 230, drive sleeve; 240, second motor; 250, guide rail; 260, guide block; 270, drive rack; 280, third motor; 310, protrusion; 320, concave block; 330, guide rod; 340, manipulator. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] like Figures 1 to 12 As shown, a motor stator core welding device provided by an embodiment of the present invention includes a bracket 110, a limiting straight rod 130, a guide rod 140 and a driving member.

[0024] The bracket 110 has a mounting platform, which is arranged horizontally. The bracket 110 is provided with a first clamp, which can clamp the plurality of silicon steel sheets 120 in a coaxial state, and the first clamp can limit the movement of the silicon steel sheets 120 in its own radial direction. The bracket 110 is provided with a second clamp, which can limit the movement of the plurality of silicon steel sheets 120 in its own axial direction. It can be understood that when the plurality of silicon steel sheets 120 are placed on the mounting platform, the first clamp and the second clamp arrange the plurality of silicon steel sheets 120 to ensure that the plurality of silicon steel sheets 120 are in a relatively stable state.

[0025] The limiting straight rod 130 can be inserted into the welding grooves of multiple silicon steel sheets 120. In this embodiment, the limiting straight rod 130 is always in a vertical state, and the limiting straight rod 130 can slide in the welding groove. In the initial state, the limiting straight rod 130 is in multiple welding grooves at the same time, that is, two adjacent silicon steel sheets 120 are in a positive alignment state.

[0026] The guide rod 140 is set to be spirally slidable on the bracket 110, the guide rod 140 can abut against the limiting straight rod 130, and the guide rod 140 can enter the welding groove of the silicon steel sheet 120. When the guide rod 140 enters the welding groove of the silicon steel sheet 120, relative rotation occurs between two adjacent silicon steel sheets 120, and under the spiral action of the guide rod 140, the welding groove of the silicon steel sheet 120 is spirally shaped.

[0027] The driving member includes a first driving source and a second driving source. The first driving source is used to twist the plurality of silicon steel sheets 120. Under the action of the first driving source, there is a relative rotation force between two adjacent silicon steel sheets 120. The second driving source is used to drive the limit rod 130 and the guide rod 140 to slide alternately in the welding groove when twisting the plurality of silicon steel sheets 120. It can be understood that when the second driving source drives the limit rod 130 to slide along the welding groove, the end of the limit rod 130 disengages from contacting the welding groove of a silicon steel sheet 120, and the second driving source stops driving the limit rod 130 to move. At this time, the second driving source drives the guide rod 140 to enter the welding groove that the limit rod 130 disengages from contact. At this time, under the action of the first driving source twisting the plurality of silicon steel sheets 120, relative rotation occurs between the silicon steel sheets 120. The second driving source reciprocates the limiting straight rod 130 and the guiding rod 140 , so that the limiting straight rod 130 completely disengages from the welding grooves of the plurality of silicon steel sheets 120 , and the guiding rod 140 completely enters the welding grooves of the plurality of silicon steel sheets 120 .

[0028] A motor stator core welding device of the present invention, when manufacturing the core, multiple silicon steel sheets 120 are placed on a bracket 110, under the action of a first clamp and a second clamp on the bracket 110, the multiple silicon steel sheets 120 are in a coaxial state, the multiple silicon steel sheets 120 will not move axially, and the multiple silicon steel sheets 120 will not move radially. In this state, a limiting straight rod 130 is simultaneously inserted into the welding grooves of the multiple silicon steel sheets 120, and a first driving source in a driving member twists the multiple silicon steel sheets 120. Under the action of a second driving member in the driving member, the limiting straight rod 130 and the guide rod 140 move alternately in the welding groove. When the guide rod 140 enters the welding groove, two adjacent silicon steel sheets 120 rotate relative to each other, so that the welding grooves of the multiple silicon steel sheets 120 are spirally shaped. Under the action of the guide rod 140, the spiral lines of the welding grooves become regular, thereby improving the quality and efficiency of motor manufacturing.

[0029] In one embodiment, the first clamp includes a support plate 150 and a plurality of expansion arc plates 160. The support plate 150 is configured to be a disc shape. The support plate 150 is disposed on the mounting platform of the bracket 110. A plurality of guide grooves are disposed on the support plate 150. The plurality of guide grooves are evenly distributed along the circumference of the support plate 150, and each guide groove is disposed along the radial direction of the support plate 150. Each expansion arc plate 160 is slidably disposed along a guide groove, and each limiting arc plate can contact the inner side wall of the silicon steel sheet 120. The plurality of expansion arc plates 160 can simultaneously approach or move away from the axis of the support plate 150. In a specific setting, a driving rod is provided at the axis of the support disk 150. The driving rod is vertically arranged and can be telescopically arranged. The lower end of the driving rod is fixedly connected to the support disk 150. A plurality of hinged rods are provided at the upper end of the driving rod. One end of each hinged rod is hinged to the upper end of the driving rod, and the other end of each hinged rod is hinged to an expansion arc plate 160. When the length of the driving rod changes, the expansion arc plate 160 slides along the guide groove. In the initial state, the driving rod is in the shortest state, and two adjacent expansion arc plates 160 abut against each other. The plurality of expansion arc plates 160 form a ring with the smallest diameter, ensuring that the silicon steel sheets 120 can be smoothly placed on the outside of the plurality of expansion arc plates 160. When the plurality of silicon steel sheets 120 are placed on the support disk 150, the driving rod is controlled to extend, and the plurality of expansion arc plates 160 move away from each other and abut against the inner wall of the silicon steel sheet 120 at the same time, so that the plurality of silicon steel sheets 120 are in a coaxial state.

[0030] In one embodiment, the second clamp includes an extrusion ring 170 and a driving cylinder 180. The driving cylinder 180 is vertically arranged, and the axis of the driving cylinder 180 is coaxial with the support plate 150. The driving cylinder 180 has a fixed end and a telescopic end. The fixed end of the driving cylinder 180 is arranged above the telescopic end. The fixed end of the driving cylinder 180 is fixedly arranged on the bracket 110, and the telescopic end of the driving cylinder 180 is arranged close to the support plate 150; the extrusion ring 170 is fixedly arranged at the telescopic end of the driving cylinder 180, and the driving cylinder 180 can drive the extrusion ring 170 to contact the silicon steel sheet 120. Under the action of the driving cylinder 180, the extrusion ring 170 squeezes the multiple silicon steel sheets 120 to prevent the multiple silicon steel sheets 120 from moving in the vertical direction.

[0031] In one embodiment, the first driving source includes a driving cylinder 210 and a first motor 220. The driving cylinder 210 is coaxially fixedly connected with the support disk 150, and the driving cylinder 210 is rotatably connected with the bracket 110. The first motor 220 is used to drive the driving cylinder 210 to rotate. In a specific setting, the driving cylinder 210 is arranged below the support disk 150, and a transmission gear is arranged on the power output shaft of the first motor 220. A transmission gear ring is arranged on the driving cylinder 210, and the transmission gear is meshed and connected with the transmission gear ring. When the first motor 220 is started, the driving cylinder 210 and the support disk 150 are rotated synchronously through the transmission of the transmission gear and the transmission gear ring. The rotation of the support disk 150 is driven by a plurality of expansion arc plates 160, so that a plurality of silicon steel sheets 120 rotate.

[0032] In one embodiment, the second driving source includes a driving sleeve 230 and a second motor 240. The driving sleeve 230 is coaxially sleeved on the outside of the driving cylinder 210, and the driving sleeve 230 can rotate relative to the driving cylinder 210. The second motor 240 is used to drive the driving sleeve 230 to rotate. In a specific setting, a mounting groove is provided on the driving cylinder 210, and the second motor 240 is fixedly arranged in the mounting groove. A transmission ring is provided on the power output shaft of the second motor 240. The inner side wall of the driving sleeve 230 is set as a rough surface, and the transmission ring can abut against the inner side wall of the driving sleeve 230. When the second motor 240 is started, the driving sleeve 230 can rotate relative to the driving cylinder 210. A guide member is provided in the driving sleeve 230. When the driving sleeve 230 and the driving cylinder 210 rotate relative to each other, the guide member guides the guide rod 140, and the guide member guides the guide rod 140 to slide relative to the support plate 150, and the guide member guides the guide rod 140 to the welding groove of the silicon steel sheet 120.

[0033] In one embodiment, the guide member includes a guide rail 250 and a guide block 260. The guide rail 250 is arranged on the inner wall of the driving sleeve 230. The guide rail 250 is parallel to the axis of the driving sleeve 230, that is, the guide rail 250 is arranged vertically. The guide block 260 is fixedly arranged at one end of the guide rod 140 away from the extrusion ring 170. The guide block 260 can slide along the guide rail 250. When the driving sleeve 230 and the driving cylinder 210 rotate relative to each other, the guide block 260 slides along the guide rail 250, and the guide rod 140 gradually enters the welding groove of the silicon steel sheet 120 or the guide rod 140 gradually leaves the welding groove of the silicon steel sheet 120.

[0034] In one embodiment, the second driving source further includes a driving rack 270, a third motor 280 and a driving gear. The driving rack 270 is fixedly connected to the limiting straight rod 130. According to the setting of the limiting straight rod 130, the driving rack 270 is in a vertical state. The third motor 280 is set on the extrusion ring 170. The driving gear is connected to the power output shaft of the third motor 280. The third motor 280 can drive the driving gear to rotate. The driving gear is meshed with the driving rack 270. When the third motor 280 is started, the driving gear and the driving rack 270 are driven, so that the limiting straight rod 130 has the power to actively move in the initial direction. In this embodiment, before the driving cylinder 210 and the driving sleeve 230 rotate relative to each other, the third motor 280 is first controlled to drive the driving rack 270 to move upward, that is, the lower end of the limiting straight rod 130 is controlled to move up by the thickness of a silicon steel sheet 120, and then the driving cylinder 210 is controlled to rotate. The rotation of the driving cylinder 210 causes the two adjacent silicon steel sheets 120 to rotate relative to each other, and then the rotation of the driving cylinder 210 is stopped, and the driving sleeve 230 is started to rotate on the driving cylinder 210. The relative rotation between the driving cylinder 210 and the driving sleeve 230 can drive the guide rod 140 to gradually enter the welding groove of the silicon steel sheet 120, and make the guide rod 140 and the limiting straight rod 130 abut against each other.

[0035] In one of the embodiments, after the driving cylinder 210 finishes rotating, the third motor 280 is started, and the third motor 280 drives the limiting straight rod 130 to extrude the silicon steel sheet 120. At the same time, burrs are likely to remain when the welding groove is manufactured on the periphery of the silicon steel sheet 120. At this time, when the limiting straight rod 130 extrude the silicon steel sheet 120, the burrs of the silicon steel sheet 120 are flattened, thereby reducing the impact of the burrs on the silicon steel sheet 120 on the subsequent manufacturing of the motor.

[0036] In one of the embodiments, a protrusion 310 is provided on the limiting straight rod 130 at one end close to the support plate 150, and a concave block 320 is provided on the end of the guide rod 140 close to the extrusion ring 170. The protrusion 310 and the concave block 320 can fit together. In the initial state, the protrusion 310 of the limiting straight rod 130 and the concave block 320 of the guide rod 140 are in a state of mutual fit. When the multiple silicon steel sheets 120 are twisted, the driving protrusion 310 and the concave block 320 are separated to prevent the fit between the protrusion 310 and the concave block 320 from affecting each other.

[0037] In one embodiment, the support 110 is provided with a guide rod 330, the guide rod 330 is parallel to the axis of the support plate 150, the guide rod 330 is provided with a manipulator 340 that can slide along the guide rod 330, and the manipulator 340 is provided with a welding head. The guide rod 330 is vertically arranged, and the support 110 is provided with a control panel, and the control panel is provided with a control program, and the control program can enable the welding head on the manipulator 340 to weld the spiral welding groove.

[0038] A method for manufacturing a motor stator core, using any one of the motor stator core welding devices described above, comprises the following steps: S100: placing a plurality of silicon steel sheets 120 on a support 110. The number of silicon steel sheets 120 is adjusted according to different requirements for manufacturing motors.

[0039] S200: Use the first clamp and the second clamp to clamp the plurality of silicon steel sheets 120. Under the joint action of the first clamp and the second clamp, the movement of the plurality of silicon steel sheets 120 is restricted, and the plurality of silicon steel sheets 120 can no longer move in the axial direction and radial direction thereof, ensuring that the plurality of silicon steel sheets 120 are in a relatively stable state.

[0040] S300: inserting the limiting straight rod 130 into the welding grooves of the plurality of silicon steel sheets 120 at the same time, and under the action of the limiting straight rod 130 , two adjacent silicon steel sheets 120 are in a positively aligned state.

[0041] S400: Control the first driving source to twist the plurality of silicon steel sheets 120 . Under the action of the first driving source, two adjacent silicon steel sheets 120 tend to rotate relative to each other. At this time, the limiting straight rod 130 prevents any two adjacent silicon steel sheets 120 from rotating relative to each other.

[0042] S500: Control the second driving source to alternately slide the limiting straight rod 130 and the guide rod 140 in the welding groove of the silicon steel sheet 120. When the limiting straight rod 130 slides in the welding groove, two adjacent silicon steel sheets 120 can rotate relative to each other. When the second driving source drives the guide rod 140 to enter the welding groove, the guide rod 140 adjusts the welding groove to a spiral shape.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor stator core welding device, characterized in that: include: A bracket, wherein a first clamp is provided on the bracket, the first clamp can clamp a plurality of silicon steel sheets in a coaxial state, and the first clamp can limit the movement of the silicon steel sheets in their own radial direction; a second clamp is provided on the bracket, and the second clamp can limit the movement of the plurality of silicon steel sheets in their own axial direction; A limit straight rod, which can be inserted into the welding grooves of multiple silicon steel sheets; A guide rod, which is arranged in a spiral shape, can slide on the bracket, can abut against the limit straight rod, and can enter the welding groove of the silicon steel sheet; The driving member includes a first driving source and a second driving source, the first driving source is used to twist the multiple silicon steel sheets, and the second driving source is used to drive the limiting straight rod and the guide rod to slide alternately in the welding groove when the multiple silicon steel sheets are twisted.

2. The motor stator core welding device according to claim 1, characterized in that: The first clamp includes a support plate and a plurality of expansion arc plates. The support plate is arranged on a bracket. A plurality of guide grooves are arranged on the support plate. The plurality of guide grooves are evenly distributed along the circumference of the support plate, and each guide groove is arranged along the radial direction of the support plate. Each expansion arc plate is slidably arranged along a guide groove, and the plurality of expansion arc plates can approach or move away from the axis of the support plate at the same time.

3. The motor stator core welding device according to claim 2, characterized in that: The second clamp includes an extrusion ring and a driving cylinder, the driving cylinder has a fixed end and a telescopic end, the fixed end of the driving cylinder is fixedly arranged on the bracket, and the telescopic end of the driving cylinder is arranged close to the supporting plate; the extrusion ring is fixedly arranged at the telescopic end of the driving cylinder, and the driving cylinder can drive the extrusion ring to contact the silicon steel sheet.

4. The motor stator core welding device according to claim 3, characterized in that: The first driving source includes a driving cylinder and a first motor. The driving cylinder is coaxially fixedly connected to the supporting disk, the driving cylinder is rotatably connected to the bracket, and the first motor is used to drive the driving cylinder to rotate.

5. The motor stator core welding device according to claim 4, characterized in that: The second driving source includes a driving sleeve and a second motor. The driving sleeve is coaxially rotatably sleeved on the outside of the driving cylinder. The second motor is used to drive the driving sleeve to rotate. A guide member is arranged in the driving sleeve. When the driving sleeve and the driving cylinder rotate relative to each other, the guide member guides the guide rod.

6. The motor stator core welding device according to claim 5, characterized in that: The guide member comprises a guide rail and a guide block. The guide rail is arranged on the inner side wall of the driving sleeve and is parallel to the axis of the driving sleeve. The guide block is fixedly arranged on one end of the guide rod away from the extrusion ring and can slide along the guide rail.

7. The motor stator core welding device according to claim 5, characterized in that: The second driving source also includes a driving rack, a third motor and a driving gear; the driving rack is fixedly connected to the limiting straight rod, the third motor is arranged on the extrusion ring, the driving gear is connected to the power output shaft of the third motor, and the driving gear is meshed with the driving rack.

8. The motor stator core welding device according to claim 7, characterized in that: The limiting straight rod is provided with a convex block at one end close to the supporting plate, and the guide rod is provided with a concave block at one end close to the extrusion ring, and the convex block and the concave block can fit each other.

9. The motor stator core welding device according to claim 1, characterized in that: The bracket is provided with a guide rod, the guide rod is parallel to the axis of the support plate, the guide rod is provided with a manipulator capable of sliding along the guide rod, and the manipulator is provided with a welding head.

10. A method for manufacturing a motor stator core, using the motor stator core welding device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S100: placing a plurality of silicon steel sheets on a bracket; S200: clamping a plurality of silicon steel sheets using a first clamp and a second clamp; S300: inserting the limit straight rod into the welding grooves of multiple silicon steel sheets at the same time; S400: controlling the first driving source to twist the plurality of silicon steel sheets; S500: Control the second driving source to cause the limiting straight rod and the guide rod to slide alternately in the welding groove of the silicon steel sheet.

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