A rotary automatic welding system and welding method for high voltage motor stator laminations

Abstract

The present invention belongs to the technical field of motor stator welding, and specifically relates to a rotary automatic welding system and welding method for high-voltage motor stator laminations. The rotary automatic welding system of the present invention is mainly composed of an outer cover, a servo motor, a positioning assembly, a weld cutting assembly, a welding assembly and a laminating assembly. The stator silicon steel sheets can be stacked on the positioning assembly, and the laminating assembly is used to apply a stacking force to the stator silicon steel sheets to form stator laminations; the positioning assembly is driven to rotate by the servo motor, so that the stator laminations can rotate at a fixed angle, meeting the needs of the weld cutting assembly to perform weld cutting processing on the stator laminations and the welding assembly to perform welding processing on the welds of the stator laminations. The positioning assembly in the present invention can uniformly preheat the stator laminations, effectively avoiding large welding deformation and poor welding quality caused by asymmetric heat input during cutting and welding.

Description

Technical Field

[0001] The invention belongs to the technical field of motor stator welding, and in particular relates to a rotary automatic welding system and a welding method for high-voltage motor stator laminations. Background Art

[0002] In the manufacturing process of high-voltage motors, the stator lamination connection methods include mechanical connection, welding, gluing, etc. Mechanical connection includes buckle-type connection, riveting and bolt connection. The joints are prone to loosening after long-term use, resulting in large deformation, increased noise and high heat during operation of the high-voltage motor, and low efficiency of the high-voltage motor. The stator laminations are connected by gluing, with high connection strength and uniform connection between the laminations; it has no effect on the magnetic circuit of the stator laminations and low stator iron loss. However, the gluing method places very high requirements on the performance of the adhesive used for bonding, requiring the adhesive layer to have high temperature resistance, fatigue resistance and a long working life, which makes the development of the adhesive layer difficult and costly. Using welding technology to connect stator laminations is an effective connection method. Compared with gluing, welding technology has low cost, stable quality after welding, and a long life; compared with mechanical connection, welding technology has smaller deformation, lower iron loss, and can obtain excellent electromagnetic properties.

[0003] The existing welding system for high-voltage motor stator laminations has been found to have some shortcomings during use. First, only one welding line is welded at a time, and asymmetric heat input can easily lead to large welding deformation and poor welding quality. If multiple welding guns are used, the equipment cost will increase. Second, the welding lines are straight at the same time. Due to the magnetic loss of the stator sheet at the welding point, the magnetic field is weakened relative to other areas, causing the induced magnetic flux of the stator at this point to be unstable, thereby forming a slight vibration of the high-voltage motor. When the laminations are made into a stator, these welding points are connected to form vertical lines, causing the induction weakening of the stator at the same phase angle to be too concentrated, and the vibration effect is significantly enhanced to form resonance, which is not conducive to the operation of the high-voltage motor. Third, the welding lines are exposed on the outside of the stator sheet and are easily worn during transportation, affecting the welding fixation effect.

[0004] In view of this, the inventor hopes to optimize and improve the existing welding system of high-voltage motor stator laminations. Summary of the invention

[0005] The object of the present invention is to overcome at least one of the above problems existing in the prior art and to provide a rotary automatic welding system and a welding method for high voltage motor stator laminations.

[0006] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a rotary automatic welding system for high-voltage motor stator laminations, comprising an outer cover, a servo motor, a positioning assembly, a weld cutting assembly, a welding assembly and a laminating assembly, wherein the outer cover comprises a cylindrical cover with an upper end opening, a servo motor is installed on the lower side of a bottom plate of the outer cover, a positioning assembly driven by the servo motor to rotate at a fixed angle is installed on the inner side of the bottom plate of the outer cover, the positioning assembly is used to stack stator silicon steel sheets, the cylindrical cover body of the outer cover is symmetrically provided with two vertical rectangular through holes, the outer sides of the two vertical rectangular through holes are respectively installed with a weld cutting assembly and a welding assembly, and a laminating assembly for providing laminating pressure to the stator silicon steel sheets is installed above the outer cover;

[0008] The weld cutting assembly includes a first rectangular convex box, a first screw motor, a first vertical screw, a first movable carrier, a first horizontal guide rail pair, a mounting seat, a driving gear, a driven gear disc, a flip motor, a horizontal telescopic push rod and a cutting knife. The first rectangular convex box is installed on the outer side of the vertical rectangular through hole corresponding to the outer cover. The internal activity limit of the first rectangular convex box is a first vertical screw. The first vertical screw is driven by the first screw motor to rotate forward or reversely. The outer side of the first vertical screw is sleeved with a first movable carrier that cooperates with it. The inner side of the first movable carrier is installed with a first horizontal guide rail pair. The outer side of the slider of the first horizontal guide rail pair is fixed with a mounting seat. The mounting seat has a driving gear and a driven gear disc that mesh with each other in activity limit. The outer side of the mounting seat is installed with a flip motor for driving the driving gear to rotate. The outer side of the driven gear disc is fixed with a horizontal telescopic push rod. The movable end of the horizontal telescopic push rod is installed with a cutting knife for cutting the formed weld.

[0009] Furthermore, in the above-mentioned rotary automatic welding system for high-voltage motor stator laminations, the stator silicon steel sheet comprises a stator punching sheet body, and the inner side of the stator punching sheet body is evenly distributed with stator slots along the circumferential direction.

[0010] Furthermore, in the above-mentioned rotary automatic welding system of the high-voltage motor stator laminations, the positioning assembly includes a turntable, and a plurality of heat-conductive positioning columns are evenly distributed along the circumferential direction on the upper side of the turntable near the outer edge, the outer shape of the heat-conductive positioning columns cooperates with the inner end shape of the stator slots in the stator silicon steel sheets, and a heating rod for providing a heat source is embedded and installed inside the heat-conductive positioning columns.

[0011] Furthermore, in the above-mentioned rotary automatic welding system for the stator laminations of the high-voltage motor, a straightening ring is fixed on the inner side of the bottom plate of the outer cover, a straightening groove cooperating with the straightening ring is opened on the lower side of the turntable, and the lower center of the turntable is directly or indirectly fixed to the output shaft of the servo motor.

[0012] Furthermore, in the above-mentioned rotary automatic welding system of high-voltage motor stator laminations, a battery for providing power to each heating rod is installed on the upper side of the turntable, and the battery is connected to the bottom end of the heating rod through a power transmission component including a battery switch and a cable, and a plurality of radial cable grooves for guiding the cables are provided inside the turntable.

[0013] Furthermore, in the above-mentioned rotary automatic welding system of the high-voltage motor stator laminations, the welding assembly includes a second rectangular convex box, a second screw motor, a second vertical screw, a second movable carrier, a second horizontal guide rail pair and a laser welding head, the second rectangular convex box is installed on the outside of the vertical rectangular through hole corresponding to the outer cover, the internal movable limit of the second rectangular convex box is limited by a second vertical screw, the second vertical screw is driven by the second screw motor to rotate forward or reversely, the outer side of the second vertical screw is sleeved with a second movable carrier matching with it, the inner side of the second movable carrier is installed with a second horizontal guide rail pair, and the outer side of the slider of the second horizontal guide rail pair is fixed with a laser welding head for welding the weld.

[0014] Furthermore, in the above-mentioned rotary automatic welding system of the high-voltage motor stator laminations, the lamination assembly includes a third horizontal guide rail pair, a vertical hydraulic push rod, a circular pressure plate, a limiting ring seat, a swivel, a tubular pressure head and a pressure equalizing convex plate. A vertical hydraulic push rod is installed on the lower side of the slider of the third horizontal guide rail pair, and a circular pressure plate is installed on the movable end of the vertical hydraulic push rod. A limiting ring seat is fixed on the lower side of the circular pressure plate near the edge, and a swivel is movably restricted in the limiting ring seat. A tubular pressure head penetrating the limiting ring seat is provided on the lower side of the swivel, and pressure equalizing convex plates are evenly distributed on the inner side of the tubular pressure head.

[0015] Furthermore, in the above-mentioned rotary automatic welding system for high-voltage motor stator laminations, the thickness of the equalizing pressure convex plate is smaller than the narrowest width value of the solid part between two adjacent stator slots in the stator silicon steel sheet, and the rotating ring, tubular pressure head and equalizing pressure convex plate are an integrated structure.

[0016] Furthermore, in the above-mentioned rotary automatic welding system for high-voltage motor stator laminations, a marking camera is installed at the lower center of the circular pressure plate, and a marking mark is provided at the upper center of the turntable in the positioning assembly.

[0017] The present invention also provides a method for rotating automatic welding of high-voltage motor stator laminations, which is implemented based on the above-mentioned rotating automatic welding system for high-voltage motor stator laminations and includes the following steps:

[0018] 1) The main part of the stacking assembly is moved away from the upper opening of the outer cover by using the third horizontal guide rail pair, and the stator silicon steel sheets are successively dropped from the upper opening of the outer cover by using a suction cup manipulator, so that the stator silicon steel sheets are stacked on the positioning assembly;

[0019] 2) The main part of the lamination assembly is displaced to the upper opening of the outer cover by the third horizontal guide rail pair, and the alignment camera and the alignment mark are used to ensure that the axes of the circular pressure plate and the turntable coincide with each other; the movable end of the vertical hydraulic push rod in the lamination assembly extends out, and the tubular pressure head and the equalizing convex plate apply lamination pressure to the stator silicon steel sheets, so that the stator silicon steel sheets are tightly overlapped with each other to form stator laminations; the heating rod in the positioning assembly works to preheat the stator lamination as a whole;

[0020] 3) The weld cutting assembly is used to perform weld cutting on the edge of the preheated stator laminations to obtain a corrugated zigzag weld; then the servo motor is activated, and the stator laminations are driven to rotate through the positioning assembly, and the rotating ring, the tubular pressure head and the equalizing convex plate also rotate adaptively, and then the weld cutting assembly is started again; and the process is repeated until all weld cutting processes are completed;

[0021] 4) The welding assembly is used to weld the weld seams of the preheated stator laminations to obtain a wave-shaped welding pattern; then the servo motor is activated, and the stator laminations are driven to rotate through the positioning assembly, and the rotating ring, the tubular pressure head and the equalizing convex plate also rotate adaptively, and then the welding assembly is started again; and the process is repeated until all weld seams are welded;

[0022] 5) The main part of the stacking assembly is moved away from the upper opening of the outer cover by using the third horizontal guide rail pair, and the welded stator stack is taken out by using a suction cup manipulator.

[0023] The beneficial effects of the present invention are:

[0024] 1. The present invention provides a rotary automatic welding system for high-voltage motor stator laminations, which is mainly composed of an outer cover, a servo motor, a positioning assembly, a weld cutting assembly, a welding assembly and a laminating assembly. Stator silicon steel sheets can be stacked on the positioning assembly, and the laminating assembly is used to apply a stacking force to the stator silicon steel sheets to form stator laminations; the servo motor is used to drive the positioning assembly to rotate, so that the stator laminations can rotate at a fixed angle, meeting the needs of the weld cutting assembly to perform weld cutting processing on the stator laminations and the welding assembly to perform welding processing on the welds of the stator laminations.

[0025] 2. The positioning assembly in the present invention can preheat the stator laminations uniformly, effectively avoiding large welding deformation and poor welding quality caused by asymmetric heat input during cutting and welding processes.

[0026] 3. The weld cutting assembly in the present invention can perform cutting processing on the stator laminations to obtain welds in the form of wavy broken lines, and the welding assembly can perform welding processing on the welds of the stator laminations to obtain welding lines in the form of wavy broken lines. On the one hand, the welding lines are hidden in the stator laminations and are not easily damaged; on the other hand, the welding lines can avoid the adverse effects caused by the formation of vertical lines by the welding point connections.

[0027] Of course, any product implementing the present invention does not necessarily need to achieve all of the above advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are 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 creative work.

[0029] Figure 1 It is a schematic diagram of the overall main structure of the rotary automatic welding system of the present invention;

[0030] Figure 2 Schematic diagram of the three-dimensional structure of the stator silicon steel sheet in the present invention;

[0031] Figure 3 Schematic diagram of the top view of the stator silicon steel sheet in the present invention;

[0032] Figure 4 It is a schematic diagram of the three-dimensional structure of the stator silicon steel sheet after cutting in the present invention;

[0033] Figure 5 This is a schematic diagram of the main structure of the outer cover in the present invention;

[0034] Figure 6 It is a schematic diagram of the top view of the positioning assembly in the present invention;

[0035] Figure 7 This is a schematic diagram of the top view of the structure after the positioning assembly of the present invention is loaded with stator laminations;

[0036] Figure 8 It is a schematic diagram of the three-dimensional structure of the stator laminations after the weld cutting process in the present invention;

[0037] Fig. 9 This is a schematic diagram of the three-dimensional structure of the positioning assembly of the present invention after loading the stator silicon steel sheet;

[0038] Fig.10 It is a schematic diagram of the main structure of the weld cutting assembly in the present invention;

[0039] Fig.11It is a structural schematic diagram of the first movable carrier block and the components thereon in the present invention;

[0040] Fig.12 It is a schematic diagram of the main structure of the welding assembly in the present invention;

[0041] Fig.13 It is a structural schematic diagram of the second movable carrier block and the components thereon in the present invention;

[0042] Fig.14 It is a schematic diagram of the main structure of the stacking assembly in the present invention;

[0043] Fig.15 It is a schematic diagram of a half-section structure of the limiting ring seat in the present invention;

[0044] Fig.16 It is a schematic diagram of the structure of the transfer ring, the tubular pressure head and the pressure equalizing convex plate in the present invention;

[0045] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0046] 1-outer cover, 101-columnar cover, 102-vertical rectangular through hole, 103-rightening ring;

[0047] 2-Servo motor;

[0048] 3-positioning assembly, 301-turntable, 302-heat-conducting positioning column, 303-heating rod;

[0049] 4-weld cutting assembly, 401-first rectangular convex box, 402-first screw motor, 403-first vertical screw, 404-first movable carrier, 405-first horizontal guide rail pair, 406-mounting seat, 407-driving gear, 408-driven gear plate, 409-flip motor, 410-horizontal telescopic push rod, 411-cutting knife;

[0050] 5-welding assembly, 501-second rectangular convex box, 502-second screw motor, 503-second vertical screw, 504-second movable carrier, 505-second horizontal guide rail pair, 506-laser welding head;

[0051] 6- stacking assembly, 601- third horizontal guide rail pair, 602- vertical hydraulic push rod, 603- circular pressure plate, 604- limiting ring seat, 605- swivel, 606- tubular pressure head, 607- equalizing convex plate, 608- benchmarking camera;

[0052] 7- stator silicon steel sheet, 701- stator punching sheet body, 702- stator slot, 703- slit. DETAILED DESCRIPTION

[0053] 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.

[0054] like Figure 1 and Figure 5 As shown, this embodiment provides a rotary automatic welding system for high-voltage motor stator laminations, including an outer cover 1, a servo motor 2, a positioning assembly 3, a weld cutting assembly 4, a welding assembly 5 and a stacking assembly 6. The outer cover 1 includes a cylindrical cover 101 with an upper end opening, a servo motor 2 is installed on the lower side of the bottom plate of the outer cover 1, and a positioning assembly 3 that can be driven by the servo motor 2 to rotate at a fixed angle is installed on the inner side of the bottom plate of the outer cover 1. The positioning assembly 3 is used to stack the stator silicon steel sheets 7. The cylindrical cover body of the outer cover 1 is symmetrically provided with two vertical rectangular through holes 102, and the weld cutting assembly 4 and the welding assembly 5 are respectively installed on the outside of the two vertical rectangular through holes 102, and a stacking assembly 6 for providing stacking pressure to the stator silicon steel sheets 7 is installed above the outer cover 1.

[0055] like Figure 2-Figure 4 As shown, the stator silicon steel sheet 7 comprises a stator punching body 701, and the inner side of the stator punching body 701 is uniformly provided with stator slots 702 along the circumferential direction. After the stator silicon steel sheet 7 is cut by the weld cutting assembly 4, a cut slit 703 is formed at the outer edge.

[0056] like Figure 6-Figure 9 As shown, the positioning assembly 3 includes a turntable 301, and a plurality of heat-conducting positioning columns 302 are evenly distributed along the circumferential direction near the outer edge of the upper side of the turntable 301. The outer shape of the heat-conducting positioning column 302 cooperates with the inner end shape of the stator slot 702 in the stator silicon steel sheet 7, and a heating rod 303 for providing a heat source is embedded in the interior of the heat-conducting positioning column 302.

[0057] like Figure 5 As shown, a stabilizing ring 103 is fixed to the inner side of the bottom plate of the outer cover 1, and a stabilizing groove cooperating with the stabilizing ring 103 is provided on the lower side of the turntable 301. The lower center of the turntable 301 is directly or indirectly fixed to the output shaft of the servo motor 2.

[0058] In this embodiment, a battery (not shown in the figure to simplify the drawing) for providing power to each heating rod 303 is installed on the upper side of the turntable 301. The battery is connected to the bottom end of the heating rod 303 through a power transmission component including a battery switch and a cable. The inside of the turntable 301 is provided with a plurality of radial cable grooves for guiding the cables.

[0059] like Fig.10 and Fig.11As shown, the weld cutting assembly 4 includes a first rectangular convex box 401, a first screw motor 402, a first vertical screw 403, a first movable carrier 404, a first horizontal guide rail pair 405, a mounting seat 406, a driving gear 407, a driven gear plate 408, a flip motor 409, a horizontal telescopic push rod 410 and a cutting knife 411. The first rectangular convex box 401 is installed on the outside of the vertical rectangular through hole 102 corresponding to the outer cover 1, and the internal movement of the first rectangular convex box 401 is limited by the first vertical screw 403, and the first vertical screw 403 is driven by the first screw motor 402 to rotate forward or reverse, and the first screw motor 402 is installed at the outer edge of one side of the outer cover 1 through the first motor bracket. The first movable carrier 404 matching with it is sleeved and installed on the outer side of the first vertical screw 403, and the first movable carrier 404 is provided with a first screw slot, and the first movable carrier 404 is slidably abutted against the inner wall of the first rectangular convex box 401. A first horizontal guide pair 405 is installed inside the first movable carrier 404, and a mounting seat 406 is fixed outside the slider of the first horizontal guide pair 405. The mounting seat 406 has a driving gear 407 and a driven gear plate 408 that mesh with each other, and a flip motor 409 for driving the driving gear 407 to rotate is installed outside the mounting seat 406. A horizontal telescopic push rod 410 is fixed outside the driven gear plate 408, and a cutting knife 411 for cutting the formed weld is installed at the movable end of the horizontal telescopic push rod 410.

[0060] The working principle of the weld cutting assembly 4 is as follows: when the stator laminations need to be weld cut, the vertical displacement mechanism composed of the first screw motor 402, the first vertical screw 403, and the first movable carrier 404 is used to drive the cutting knife 411 to perform vertical displacement, the first horizontal guide rail pair 405 is used to drive the cutting knife 411 to perform horizontal lateral displacement, the turning mechanism composed of the mounting seat 406, the driving gear 407, the driven gear plate 408, and the turning motor 409 is used to drive the cutting knife 411 to rotate, and the horizontal telescopic push rod 410 is used to drive the cutting knife 411 to displace radially along the stator laminations, so that the cutting knife 411 can weld and cut the stator laminations according to the wavy zigzag path under the combined influence of vertical displacement, horizontal lateral displacement and rotation. After each zigzag line cutting process is completed by the cutting knife 411, it is necessary to use the horizontal telescopic push rod 410 to drive it to retract, adjust the direction, and then perform the next zigzag line cutting process.

[0061] like Fig.12 and Fig.13As shown, the welding assembly 5 includes a second rectangular convex box 501, a second screw motor 502, a second vertical screw 503, a second movable carrier 504, a second horizontal guide rail pair 505 and a laser welding head 506. The second rectangular convex box 501 is installed on the outside of the vertical rectangular through hole 102 corresponding to the outer cover 1. The internal activity of the second rectangular convex box 501 is limited by the second vertical screw 503. The second vertical screw 503 is driven by the second screw motor 502 to rotate forward or reverse. The second screw motor 502 is installed at the outer edge of the other side of the outer cover 1 through the second motor bracket. The second movable carrier 504 that cooperates with it is sleeved and installed on the outer side of the second vertical screw 503. The second movable carrier 504 is provided with a second screw slot. The second movable carrier 504 slides against the inner wall of the second rectangular convex box 501. A second horizontal guide rail pair 505 is installed on the inner side of the second movable carrier block 504 , and a laser welding head 506 for welding the weld is fixed on the outer side of the slider of the second horizontal guide rail pair 505 .

[0062] The working principle of the welding assembly 5 is as follows: when the stator laminations need to be welded, the vertical displacement mechanism composed of the second screw motor 502, the second vertical screw 503, and the second movable carrier 504 is used to drive the laser welding head 506 to perform vertical displacement, and the second horizontal guide rail pair 505 is used to drive the laser welding head 506 to perform horizontal lateral displacement, so that the laser welding head 506 can weld the weld according to the wavy broken line path under the combined influence of the vertical displacement and the horizontal lateral displacement, forming a wavy broken line welding pattern.

[0063] like Figure 14-16 As shown, the stacking assembly 6 includes a third horizontal guide rail pair 601, a vertical hydraulic push rod 602, a circular pressure plate 603, a limiting ring seat 604, a swivel 605, a tubular pressure head 606 and a pressure equalizing convex plate 607. A vertical hydraulic push rod 602 is installed on the lower side of the slider of the third horizontal guide rail pair 601, a circular pressure plate 603 is installed on the movable end of the vertical hydraulic push rod 602, and a limiting ring seat 604 is fixed on the lower side of the circular pressure plate 603 near the edge. A swivel 605 is provided to limit the movement in the limiting ring seat 604. A tubular pressure head 606 penetrating the limiting ring seat 604 is provided on the lower side of the swivel 605. Pressure equalizing convex plates 607 are evenly distributed on the inner side of the tubular pressure head 606. The thickness of the pressure equalizing convex plates 607 is smaller than the narrowest width of the solid part between two adjacent stator slots 702 in the stator silicon steel sheet 7. The swivel 605, the tubular pressure head 606 and the pressure equalizing convex plates 607 are an integrated structure.

[0064] In this embodiment, a marking camera 608 is installed at the lower center of the circular pressure plate 603, and a marking mark is provided at the upper center of the turntable 301 in the positioning component 3.

[0065] The working principle of the lamination assembly 6 is as follows: the third horizontal guide rail pair 601 is used to realize the movement of the main body of the lamination assembly 6, so that the main body will not affect the placement of the stator silicon steel sheet 7, and the alignment camera 608 and the alignment mark are used to ensure the position accuracy after reset, so that the lamination pressure is applied evenly. The design of the limit ring seat 604, the rotating ring 605, the tubular pressure head 606 and the pressure balancing convex plate 607 enables the rotating ring 605, the tubular pressure head 606 and the pressure balancing convex plate 607 to rotate adaptively with the stator lamination during the pressure application process, meeting the needs of rotary cutting and rotary processing.

[0066] This embodiment also provides a method for rotating automatic welding of high-voltage motor stator laminations, comprising the following steps:

[0067] 1) The main part of the stacking assembly 6 is moved away from the upper opening of the outer cover 1 by using the third horizontal guide rail pair 601, and the stator silicon steel sheets 7 are successively dropped from the upper opening of the outer cover 1 by using a suction cup manipulator, so that the stator silicon steel sheets 7 are stacked on the positioning assembly 3;

[0068] 2) The main part of the lamination assembly 6 is moved to the upper opening of the outer cover 1 by using the third horizontal guide rail pair 601, and the alignment camera 608 and the alignment mark are used to ensure that the axes of the circular pressing plate 603 and the rotating disk 301 coincide with each other; the movable end of the vertical hydraulic push rod 602 in the lamination assembly 6 is extended, and the tubular pressure head 606 and the equalizing convex plate 607 apply lamination pressure to the stator silicon steel sheets 7, so that the stator silicon steel sheets 7 are tightly overlapped with each other to form stator laminations; the heating rod 303 in the positioning assembly 3 works to preheat the stator lamination as a whole;

[0069] 3) The weld cutting assembly 4 is used to perform weld cutting processing on the edge of the preheated stator laminations to obtain a corrugated zigzag weld, which is composed of the cut seams 703 of each stator silicon steel sheet 7; then the servo motor 2 is activated, and the stator laminations are driven to rotate through the positioning assembly 3, and the rotating ring 605, the tubular pressure head 606 and the equalizing convex plate 607 also rotate adaptively, and then the weld cutting assembly 4 is started again; and the process is repeated until the cutting of all welds is completed;

[0070] 4) The welding assembly 5 is used to weld the weld seams of the preheated stator laminations to obtain a wave-shaped welding pattern; then the servo motor 2 is activated, and the stator laminations are driven to rotate through the positioning assembly 3, and the rotating ring 605, the tubular pressure head 606 and the equalizing convex plate 607 also rotate adaptively, and then the welding assembly 5 is started again; and the process is repeated until the welding of all weld seams is completed;

[0071] 5) The main part of the lamination assembly 6 is moved away from the upper opening of the outer cover 1 by means of the third horizontal guide rail pair 601, and the welded stator laminations are taken out by means of a suction cup manipulator.

[0072] The preferred embodiments of the present invention disclosed above are only useful to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A rotary automatic welding system for high voltage motor stator laminations, characterized in that: It comprises an outer cover, a servo motor, a positioning assembly, a weld cutting assembly, a welding assembly and a laminating assembly, wherein the outer cover comprises a cylindrical cover with an upper end opening, a servo motor is installed on the lower side of the bottom plate of the outer cover, a positioning assembly driven by the servo motor to rotate at a fixed angle is installed on the inner side of the bottom plate of the outer cover, the positioning assembly is used to stack stator silicon steel sheets, the cylindrical cover body of the outer cover is symmetrically provided with two vertical rectangular through holes, the outer sides of the two vertical rectangular through holes are respectively installed with a weld cutting assembly and a welding assembly, and a laminating assembly for providing laminating pressure to the stator silicon steel sheets is installed above the outer cover; The weld cutting assembly includes a first rectangular convex box, a first screw motor, a first vertical screw, a first movable carrier, a first horizontal guide rail pair, a mounting seat, a driving gear, a driven gear disk, a flip motor, a horizontal telescopic push rod and a cutting knife. The first rectangular convex box is installed on the outer side of the vertical rectangular through hole corresponding to the outer cover. The first rectangular convex box is internally movable with a first vertical screw, and the first vertical screw is driven by the first screw motor to rotate forward or reversely. The outer side of the first vertical screw is sleeved with a first movable carrier matched with it, the inner side of the first movable carrier is installed with a first horizontal guide rail pair, the outer side of the slider of the first horizontal guide rail pair is fixed with a mounting seat, the movable limit of the mounting seat is a driving gear and a driven gear disk that mesh with each other, the outer side of the mounting seat is installed with a flip motor for driving the driving gear to rotate, the outer side of the driven gear disk is fixed with a horizontal telescopic push rod, and the movable end of the horizontal telescopic push rod is installed with a cutting knife for cutting a formed weld. The stator silicon steel sheet comprises a stator punching sheet body, and the inner side of the stator punching sheet body is uniformly distributed with stator slots along the circumferential direction; The positioning assembly includes a turntable, and a plurality of heat-conducting positioning columns are evenly distributed along the circumferential direction near the outer edge of the upper side of the turntable. The outer shape of the heat-conducting positioning columns matches the inner end shape of the stator slots in the stator silicon steel sheets, and a heating rod for providing a heat source is embedded and installed inside the heat-conducting positioning columns.

2. The rotary automatic welding system for high-voltage motor stator laminations according to claim 1 is characterized in that: A stabilizing ring is fixed on the inner side of the bottom plate of the outer cover, a stabilizing groove cooperating with the stabilizing ring is provided on the lower side of the turntable, and the lower center of the turntable is directly or indirectly fixed to the output shaft of the servo motor.

3. The rotary automatic welding system for high-voltage motor stator laminations according to claim 2 is characterized in that: A battery for providing power to each heating rod is installed on the upper side of the turntable. The battery is connected to the bottom end of the heating rod through a power transmission member including a battery switch and a cable. A plurality of radial cable grooves for guiding the cables are provided inside the turntable.

4. The rotary automatic welding system for high-voltage motor stator laminations according to claim 3 is characterized in that: The welding assembly includes a second rectangular convex box, a second screw motor, a second vertical screw, a second movable carrier, a second horizontal guide rail pair and a laser welding head. The second rectangular convex box is installed on the outside of the vertical rectangular through hole corresponding to the outer cover. The internal movable limit of the second rectangular convex box is a second vertical screw. The second vertical screw is driven by the second screw motor to rotate forward or reversely. The outer side of the second vertical screw is sleeved with a second movable carrier that cooperates with it. The inner side of the second movable carrier is installed with a second horizontal guide rail pair. The outer side of the slider of the second horizontal guide rail pair is fixed with a laser welding head for welding the weld.

5. The rotary automatic welding system for high-voltage motor stator laminations according to claim 4 is characterized in that: The stacking assembly includes a third horizontal guide rail pair, a vertical hydraulic push rod, a circular pressure plate, a limiting ring seat, a swivel, a tubular pressure head and a pressure equalizing convex plate. A vertical hydraulic push rod is installed on the lower side of the slider of the third horizontal guide rail pair, and a circular pressure plate is installed on the movable end of the vertical hydraulic push rod. A limiting ring seat is fixed on the lower side of the circular pressure plate near the edge, and a swivel is provided in the limiting ring seat for movement. A tubular pressure head penetrating the limiting ring seat is provided on the lower side of the swivel, and pressure equalizing convex plates are evenly distributed on the inner side of the tubular pressure head.

6. The rotary automatic welding system for high-voltage motor stator laminations according to claim 5, characterized in that: The thickness of the pressure equalizing convex plate is smaller than the narrowest width value of the solid part between two adjacent stator slots in the stator silicon steel sheet, and the rotating ring, the tubular pressure head and the pressure equalizing convex plate are an integrated structure.

7. The rotary automatic welding system for high-voltage motor stator laminations according to claim 6, characterized in that: A marking camera is installed at the center of the lower side of the circular pressure plate, and a marking mark is provided at the center of the upper side of the turntable in the positioning component.

8. A method for rotating automatic welding of high-voltage motor stator laminations, implemented based on the rotating automatic welding system for high-voltage motor stator laminations according to claim 7, characterized in that: The steps include: 1) The main part of the stacking assembly is moved away from the upper opening of the outer cover by using the third horizontal guide rail pair, and the stator silicon steel sheets are successively dropped from the upper opening of the outer cover by using a suction cup manipulator, so that the stator silicon steel sheets are stacked on the positioning assembly; 2) The main part of the lamination assembly is displaced to the upper opening of the outer cover by the third horizontal guide rail pair, and the alignment camera and the alignment mark are used to ensure that the axes of the circular pressure plate and the turntable coincide with each other; the movable end of the vertical hydraulic push rod in the lamination assembly extends out, and the tubular pressure head and the equalizing convex plate apply lamination pressure to the stator silicon steel sheets, so that the stator silicon steel sheets are tightly overlapped with each other to form stator laminations; the heating rod in the positioning assembly works to preheat the stator lamination as a whole; 3) The weld cutting assembly is used to perform weld cutting on the edge of the preheated stator laminations to obtain a corrugated zigzag weld; then the servo motor is activated, and the stator laminations are driven to rotate through the positioning assembly, and the rotating ring, the tubular pressure head and the equalizing convex plate also rotate adaptively, and then the weld cutting assembly is started again; and the process is repeated until all weld cutting processes are completed; 4) The welding assembly is used to weld the weld seams of the preheated stator laminations to obtain a wave-shaped welding pattern; then the servo motor is activated, and the stator laminations are driven to rotate through the positioning assembly, and the rotating ring, the tubular pressure head and the equalizing convex plate also rotate adaptively, and then the welding assembly is started again; and the process is repeated until all weld seams are welded; 5) The main part of the stacking assembly is moved away from the upper opening of the outer cover by using the third horizontal guide rail pair, and the welded stator stack is taken out by using a suction cup manipulator.

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