An automated spot welding processing equipment for motor accessories

Abstract

The application relates to the technical field of automatic mechanical processing, and discloses an automatic spot welding processing equipment for motor accessories, which comprises a rack, an X-axis track and a Y-axis track arranged on the rack, an electric welding machine arranged on the rack and located above the X-axis track, a welding assembly arranged at the output end of the electric welding machine, the welding assembly comprising coaxially arranged electric welding electrodes, a flat-head pressing cylinder and a conical-face pressing cylinder, the flat-head pressing cylinder being arranged on the outside of the electric welding electrodes, the conical-face pressing cylinder being arranged on the outside of the flat-head pressing cylinder, and the welding assembly further comprising spring one and spring two. Through the coaxial nesting of the conical-face pressing cylinder, the flat-head pressing cylinder and the electric welding electrodes, and the cooperation of the two-stage elastic transmission and the stroke limiting mechanism, the multi-step process linkage under single-axis driving is realized, and through the cooperation of the limiting block and the limiting groove, the conical-face pressing cylinder is forced to stop descending after completing the pre-bending action.

Description

Technical Field

[0001] This invention relates to the field of automated machining technology, specifically to an automated spot welding equipment for motor parts. Background Technology

[0002] In the manufacturing process of motor stators or rotors, the soldering of lead wires is a critical step that determines the electrical performance of the motor. Typically, motor components use U-shaped copper wire structures for their terminals. Before soldering, the upright copper wire leads need to be bent and pre-aligned to fit against the conductive surface before spot welding can be performed. This process demands extremely high precision in process timing and mechanical actions, directly impacting the final product yield.

[0003] In current motor component welding processes, the problem of fragmented processes is prevalent. Existing processing methods typically separate the bending and welding processes at different workstations, or use manual assistance to bend the copper leads before placing them in the welding machine. This step-by-step operation not only increases the length of the production line and the cost of equipment, but also, during the transfer between workstations, the bent copper leads are prone to slight displacement due to stress rebound, resulting in gaps between the copper leads and the conductive surface at subsequent welding stations. Once these gaps exist, welding spatter, incomplete soldering, or sparking can easily occur at the moment of electrode contact, severely affecting the weld strength and appearance quality.

[0004] Motor components are typically covered with a fragile insulating layer, and the copper feet are extremely close to the product body. When conventional welding heads are pressed down to the bottom, they are prone to directly and rigidly impacting or rubbing against the insulating surface of the product due to the inability to accurately control the stopping position, causing product damage or insulation failure, which hinders further improvement in production efficiency. Therefore, this invention provides an automated spot welding processing device for motor components to overcome the shortcomings of the existing technology. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an automated spot welding equipment for motor components, solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an automated spot welding processing equipment for motor parts, comprising: A frame, and an X-axis track and a Y-axis track mounted on the frame; An electric welding machine is mounted on the frame and positioned above the X-axis track; The output end of the welding machine is provided with a welding assembly, which includes a coaxially arranged welding electrode, a flat-head pressure cylinder and a conical pressure cylinder; The flat-head pressure cylinder is sleeved outside the welding electrode, and the conical pressure cylinder is sleeved outside the flat-head pressure cylinder; The welding assembly also includes a first spring and a second spring. The first spring is disposed between the welding electrode and the flat-head pressure cylinder to form a first-stage elastic transmission, and the second spring is disposed between the flat-head pressure cylinder and the conical pressure cylinder to form a second-stage elastic transmission.

[0007] Preferably, a pressure ring is fixedly provided on the welding electrode, and a spring abuts between the pressure ring and the end of the flat-headed pressure cylinder; a pressure ring is fixedly provided on the outer wall of the flat-headed pressure cylinder, and a spring abuts between the pressure ring and the inner wall step of the conical pressure cylinder; in the natural state, the welding end of the welding electrode is retracted into the flat-headed pressure cylinder, and the bottom end of the flat-headed pressure cylinder is retracted into the conical pressure cylinder.

[0008] Preferably, it further includes a connecting plate and a support block. The connecting plate is fixedly installed on the outer shell of the welding machine, and the support block is connected to the end position of the connecting plate. A limit groove is formed on the support block, and a limit block is fixedly provided on the outer side of the conical pressure cylinder. The limit block is slidably connected in the limit groove. Through the cooperation between the limit block and the limit groove, the travel of the conical pressure cylinder following the downward movement of the welding electrode is limited.

[0009] Preferably, the bottom end face of the conical pressure cylinder is provided with an inwardly inclined chamfer structure, which is used to guide and pre-bend the wiring pins of the motor accessories during the pressing process; the bottom end face of the flat-head pressure cylinder is a planar structure, which is used to flatten the pre-bent wiring pins.

[0010] Preferably, it also includes a welding box, which is mounted on the frame, and the X-axis track passes through the interior of the welding box; a second tray is slidably mounted on the X-axis track, which is used to carry the product and move it under the welding machine for welding; the second tray is provided with a positioning post, which is used to cooperate with the hole inside the product to fix the product.

[0011] Preferably, a lifting cylinder is connected to the lower part of the second tray for driving the second tray to rise and fall; It also includes a rotary drive mechanism, which includes a cylindrical gear disposed below the second tray, a rack plate meshing with the cylindrical gear, and an electric push rod that drives the rack plate to move linearly; the electric push rod pushes the rack plate to move and drives the cylindrical gear to rotate, thereby adjusting the welding angle of the product.

[0012] Preferably, it further includes a flipping mechanism, which is disposed at the intersection of the X-axis track and the Y-axis track; the flipping mechanism includes a flipping cylinder and a mounting plate connected to the output end of the flipping cylinder, and two clamping cylinders are mounted on the mounting plate, the two clamping cylinders being arranged opposite each other to clamp the product.

[0013] Preferably, it also includes a tray and a lifting cylinder, each of which is provided in two sets; the two sets of the tray and the lifting cylinder are respectively arranged on the X-axis track and the Y-axis track, for use in conjunction with the flipping mechanism to lift and receive the product.

[0014] Preferably, the limiting groove is opened in the vertical direction, and the sliding distance of the limiting block in the limiting groove is less than the maximum downward stroke of the output end of the welding machine.

[0015] Preferably, the electric actuator is fixedly mounted on the lifting end of the second lifting cylinder and moves up and down synchronously with the second tray.

[0016] This invention provides an automated spot welding equipment for motor components. It has the following advantages: 1. This invention achieves multi-step process linkage under single-axis drive by setting up coaxial nested conical pressure cylinders, flat-head pressure cylinders and welding electrodes, and cooperating with a two-stage elastic transmission and stroke limit mechanism. By using the cooperation of limit blocks and limit grooves, the conical pressure cylinder is forced to stop descending after completing the pre-bending action, so that the internal flat-head pressure cylinder and electrode can continue to extend for operation. The segmented stroke design not only ensures the accurate pre-bending and flattening of the copper wire leads, but also effectively avoids the external pressure cylinder from directly contacting or damaging the surface of the motor parts, significantly improving the processing yield.

[0017] 2. This invention utilizes differential hysteresis logic constructed with elastic elements to lock the process sequence of compaction before welding from a physical structure perspective. The flat-headed pressure cylinder flattens the U-shaped copper foot before the welding electrode contacts it and maintains continuous clamping force, effectively overcoming the springback stress of the copper wire and ensuring zero-gap fit between the U-shaped copper foot and the conductive surface of the accessory. This eliminates the phenomenon of incomplete welding or sparking caused by poor contact and ensures the stability of welding strength and electrical performance.

[0018] 3. This invention integrates a rotary drive mechanism based on gear and rack transmission and a cylinder-driven flipping mechanism, which can adapt to the multi-angle and multi-face processing needs of motor parts. By driving the rack plate to move and the tray to rotate through the electric push rod, the welding angle of the product can be precisely adjusted. With the automatic flipping and circulation, the entire process from feeding and posture adjustment to multi-point welding is completed in one machine, which greatly improves production efficiency and reduces manual operation costs. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is an overhead view of the track structure layout of the present invention; Figure 3 This is a bottom view of the track structure layout of the present invention; Figure 4 This is a schematic diagram of the structure of tray two of the present invention; Figure 5 This is a schematic diagram highlighting the internal structure of the welding box of the present invention; Figure 6 This is a schematic diagram of the structure of the support block of the present invention; Figure 7 This is a schematic diagram of the structure of the limiting block of the present invention; Figure 8 This is a cross-sectional schematic diagram of the conical pressure cylinder of the present invention; Figure 9 This is a cross-sectional schematic diagram of the flat-head pressure cylinder of the present invention; Figure 10 for Figure 3 Enlarged view of point A in the middle.

[0020] The components include: 1. Y-axis track; 2. X-axis track; 3. Welding box; 4. Tilting cylinder; 5. Mounting plate; 6. Clamping cylinder; 7. Lifting cylinder one; 8. Tray one; 9. Lifting cylinder two; 10. Cylindrical gear; 11. Tray two; 12. Positioning column; 13. Electric push rod; 14. Rack plate; 15. Welding machine; 16. Connecting plate; 17. Support block; 18. Limiting groove; 19. Welding electrode; 20. Flat-head pressure cylinder; 21. Conical pressure cylinder; 22. Pressure ring one; 23. Spring one; 24. Pressure ring two; 25. Spring two; 26. Limiting block. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see the appendix Figure 1 -Appendix Figure 10 This invention provides an automated spot welding equipment for motor components, used to automatically pre-bend, flatten, and spot weld U-shaped copper wire pins on motor stator or rotor components. The main structure of the equipment includes a frame, on which a conveying system for workpiece transfer is arranged. The conveying system includes a Y-axis track 1 extending along the Y-axis direction and an X-axis track 2 extending along the X-axis direction. An electric welding machine 15 is set above the X-axis track 2. The electric welding machine 15 is fixed to the frame by a bracket. In order to ensure the safety of welding operations and environmental cleanliness, an electric welding box 3 is provided on the outside of the frame. The electric welding box 3 encloses the electric welding machine 15 and the corresponding welding operation area. The X-axis track 2 passes through the internal space of the electric welding box 3. The core of this embodiment lies in the welding assembly structure at the output end of the welding machine 15. This structure is designed as a three-layer coaxial nested form, using single-axis drive to achieve multi-step process actions. Specifically, the welding assembly includes a welding electrode 19, a flat-head pressure cylinder 20, and a conical pressure cylinder 21 arranged coaxially. The welding electrode 19 is located at the center, and its upper end is fixedly connected to the drive output shaft of the welding machine 15. The flat-head pressure cylinder 20 is sleeved on the outside of the welding electrode 19, and the conical pressure cylinder 21 is sleeved on the outside of the flat-head pressure cylinder 20. The bottom end face of the flat-head pressure cylinder 20 is designed as a flat structure, used to flatten and adhere the copper wire leads to the product surface. The bottom end face of the conical pressure cylinder 21 has an inwardly inclined chamfered structure, used to contact the upright copper wire leads in the initial stage of pressing down and guide them inward to a tilted state. To achieve step-by-step operation, the welding assembly integrates a two-stage elastic transmission mechanism. A pressure ring 22 is fixedly installed on the outer wall of the welding electrode 19, and a spring 23 is positioned between the pressure ring 22 and the top end face of the flat-head pressure cylinder 20, forming the first stage of elastic transmission. A pressure ring 24 is fixedly installed on the outer wall of the flat-head pressure cylinder 20, and a stepped structure is provided on the inner wall of the conical pressure cylinder 21. A spring 25 is positioned between the pressure ring 24 and the inner wall step, forming the second stage of elastic transmission. In a natural state without external force, the welding end of the welding electrode 19 retracts into the flat-head pressure cylinder 20 through the action of the spring force, and the bottom end of the flat-head pressure cylinder 20 retracts into the conical pressure cylinder 21. This means that during the pressing process, the conical pressure cylinder 21 contacts the target object first, followed by the flat-head pressure cylinder 20, and the welding electrode 19 contacts it last. To prevent the conical pressure cylinder 21 from rigidly colliding or rubbing against the surface of the motor accessories during the pressing process, this embodiment is provided with a stroke limiting mechanism. The connecting plate 16 is fixedly installed on the stationary outer shell of the welding machine 15. A support block 17 is connected to the end of the connecting plate 16. A limiting groove 18 is opened on the support block 17 along the vertical direction. A limiting block 26 is fixedly provided on the outer side of the conical pressure cylinder 21. The limiting block 26 is slidably connected in the limiting groove 18. The sliding distance of the limiting block 26 in the limiting groove 18 is less than the maximum pressing stroke of the output end of the welding machine 15. The welding machine 15 drives the spindle downwards, causing the entire assembly to descend. First, the chamfered structure of the outermost conical pressure cylinder 21 contacts the upright U-shaped copper foot on the motor accessory. As the downward pressure continues, the horizontal force generated by the chamfered surface pushes the U-shaped copper foot inwards for pre-bending. When the conical pressure cylinder 21 descends a certain distance, the limit block 26 touches the bottom of the limit groove 18, forcibly stopping the descent of the conical pressure cylinder 21. At this point, the bottom of the conical pressure cylinder 21 maintains a safe distance from the product surface. As the spindle continues to press down, the flat-head pressure cylinder 20 overcomes the elastic force of the second spring 25 and extends relative to the stopped conical pressure cylinder 21 until the bottom surface of the flat-head pressure cylinder 20 contacts the tilted U-shaped copper foot, pressing it completely flat onto the product surface. Then, the flat-head pressure cylinder 20 stops due to obstruction, and the spindle continues to press down to compress the first spring 23. The welding electrode 19 extends relative to the flat-head pressure cylinder 20 and finally contacts the surface of the copper foot and is energized to complete the welding. After the welding is completed, the spindle is lifted up, and each component resets in sequence under the action of the spring force. In terms of workpiece conveying and positioning, a tray 2 11 for carrying the product is slidably set on the X-axis track 2. The tray 2 11 is equipped with a positioning post 12. The size of the positioning post 12 matches the hole inside the motor accessory product to fix the product. A lifting cylinder 2 9 is connected below the tray 2 11 to drive the tray 2 11 to rise and fall to match the welding height. To meet the welding requirements of the four pins in the circumferential direction of the motor parts, a rotary drive mechanism is integrated under the tray 2 11. This mechanism includes a cylindrical gear 10 set at the bottom of the tray 2 11, a rack plate 14 meshing with the cylindrical gear 10, and an electric push rod 13 that drives the rack plate 14 to move linearly. The electric push rod 13 is fixedly set on the lifting end of the lifting cylinder 2 9 and moves up and down synchronously with the tray 2 11. When it is necessary to switch the welding position, the electric push rod 13 pushes the rack plate 14 to move linearly, and drives the cylindrical gear 10 and the tray 2 11 above it to rotate 90 degrees or other preset angles through the gear and rack transmission. A flipping mechanism is installed at the intersection of X-axis track 2 and Y-axis track 1 to realize double-sided processing of the product. The flipping mechanism includes a flipping cylinder 4. The output shaft of the flipping cylinder 4 is connected to a mounting plate 5. Two clamping cylinders 6 are installed opposite each other on the mounting plate 5. When the product needs to be flipped, the pallet transports the product to the intersection. The two clamping cylinders 6 clamp the two sides of the product. The flipping cylinder 4 drives the mounting plate 5 to rotate 180 degrees to flip the product. In order to coordinate the handover of the flipping action, two sets of pallets 8 and lifting cylinders 7 are respectively installed on X-axis track 2 and Y-axis track 1. The pallet 8 can lift the product under the drive of the lifting cylinder 7 and send the product into the clamping range of the clamping cylinder 6, or receive the flipped product from the clamping cylinder 6.

[0023] Working principle: After the equipment is started, the motor parts are first placed on tray 8 through the upstream process and transported to the intersection station where the flipping mechanism is located along the X-axis track 2 or Y-axis track 1. When the product needs to be flipped to match the copper wire installation direction, the lifting cylinder 7 is activated to lift tray 8 to the flipping height. At this time, the two clamping cylinders 6 on the mounting plate 5 are activated simultaneously to clamp the product from both sides. Then, the flipping cylinder 4 drives the mounting plate 5 to rotate 180 degrees to complete the product's posture flipping. After the flipping is completed, the lifting cylinder 7 on the other side drives the empty tray 8 to rise and catch the product. The clamping cylinder 6 is released, and the product falls with tray 8 and flows back to the track, and is finally transferred to tray 11 for the welding process. The second tray 11 carries the product and moves it along the X-axis track 2 into the welding box 3 and stops directly below the welding machine 15. The lifting cylinder 2 9 is activated to lift the second tray 11 and the product upward to the preset welding working height. At this time, the positioning column 12 is inserted into the mounting hole inside the product to restrict the horizontal displacement of the product. The welding process adopts a single-axis driven multi-level linkage mechanical logic. The welding machine 15 drives its output end to feed vertically downward. In the initial pressing stage, because spring 1 23 and spring 2 25 are in a pre-tightened and extended state, the welding electrode 19 is retracted into the flat-head pressure cylinder 20, and the flat-head pressure cylinder 20 is retracted into the conical pressure cylinder 21. Therefore, the conical pressure cylinder 21 is the first to approach the product. When the inward chamfer at the bottom of the conical pressure cylinder 21 contacts the end of the upright U-shaped copper foot on the motor accessory, as the downward pressing action continues, the chamfered surface applies a horizontal component force to the copper foot, guiding the copper foot to tilt inward and complete the pre-bending action. During this process, the limiting block 26 fixed on the outside of the conical pressure cylinder 21 slides down synchronously in the limiting groove 18 of the support block 17. After the U-shaped copper foot completes the pre-bending action, the limit block 26 contacts the bottom of the limit groove 18 or reaches the set limit position. At this time, the conical pressure cylinder 21 is mechanically blocked and stops descending. Since the stopping position of the conical pressure cylinder 21 is precisely limited, a safe gap is maintained between its bottom end face and the surface of the motor accessories, avoiding damage to the insulation layer caused by rigid contact. The output end of the welding machine 15 continues to drive the welding electrode 19 and the flat-head pressure cylinder 20 to move downward. At this time, the flat-head pressure cylinder 20 extends downward relative to the stationary conical pressure cylinder 21, and at the same time compresses the second spring 25. The flat bottom end of the extended flat-head pressure cylinder 20 contacts the tilted copper foot and applies vertical pressure to completely flatten the copper foot and adhere it to the conductive surface of the motor accessories. After the flat-head pressure cylinder 20 flattens the copper foot, it stops descending due to the reaction force. The welding machine 15 continues to drive the welding electrode 19 downward. At this time, the spring 1 23 is compressed, and the welding electrode 19 extends downward relative to the flat-head pressure cylinder 20, passes through the through hole in the center of the flat-head pressure cylinder 20, and finally contacts the flattened copper foot surface. As the flat-head pressure cylinder 20 continuously applies pressure to the copper foot under the action of the spring 25, it ensures a tight fit between the copper foot and the surface of the accessory, preventing welding spatter. The welding electrode 19 is energized to complete the spot welding. After a weld point is completed, the welding machine 15 is lifted and reset. Under the action of spring force, each component returns to its initial state in sequence. Then, the electric push rod 13 fixed on the lifting end of the lifting cylinder 2 9 moves, pushing the rack plate 14 to make linear displacement. The rack plate 14 drives the cylindrical gear 10 to rotate, thereby driving the upper tray 2 11 and the product to rotate 90 degrees (or other angles set according to the number of product pins), so that the next copper pin to be welded is aligned with the bottom of the welding machine 15. The above pre-bending, flattening and welding steps are repeated until all pins are processed. After processing is completed, the lifting cylinder 2 9 descends, and the tray 2 11 outputs the finished product along the track.

Claims

1. An automated spot welding processing equipment for motor parts, comprising: A frame, and an X-axis track (2) and a Y-axis track (1) mounted on the frame. An electric welding machine (15) is mounted on the frame and located above the X-axis track (2); The welding machine (15) is characterized in that its output end is provided with a welding assembly, which includes a welding electrode (19), a flat-head pressure cylinder (20), and a conical pressure cylinder (21) arranged coaxially. The flat-head pressure cylinder (20) is sleeved on the outside of the welding electrode (19), and the conical pressure cylinder (21) is sleeved on the outside of the flat-head pressure cylinder (20); The welding assembly also includes a first spring (23) and a second spring (25). The first spring (23) is disposed between the welding electrode (19) and the flat-head pressure cylinder (20) to form a first-stage elastic transmission, and the second spring (25) is disposed between the flat-head pressure cylinder (20) and the conical pressure cylinder (21) to form a second-stage elastic transmission.

2. The automated spot welding equipment for motor parts according to claim 1, characterized in that, A pressure ring (22) is fixedly provided on the welding electrode (19), and a spring (23) abuts between the pressure ring (22) and the end of the flat-headed pressure cylinder (20); a pressure ring (24) is fixedly provided on the outer wall of the flat-headed pressure cylinder (20), and a spring (25) abuts between the pressure ring (24) and the inner wall step of the conical pressure cylinder (21); in the natural state, the welding end of the welding electrode (19) is retracted into the flat-headed pressure cylinder (20), and the bottom end of the flat-headed pressure cylinder (20) is retracted into the conical pressure cylinder (21).

3. The automated spot welding equipment for motor parts according to claim 1, characterized in that, It also includes a connecting plate (16) and a support block (17). The connecting plate (16) is fixedly installed on the outer shell of the welding machine (15), and the support block (17) is connected to the end position of the connecting plate (16). A limiting groove (18) is opened on the support block (17), and a limiting block (26) is fixedly provided on the outer side of the conical pressure cylinder (21). The limiting block (26) is slidably connected in the limiting groove (18). Through the cooperation between the limiting block (26) and the limiting groove (18), the travel of the conical pressure cylinder (21) following the downward movement of the welding electrode (19) is limited.

4. The automated spot welding equipment for motor parts according to claim 1, characterized in that, The bottom end face of the conical pressure cylinder (21) is provided with an inwardly inclined chamfer structure, which is used to guide and pre-bend the wiring pins of the motor accessories during the pressing process; the bottom end face of the flat-head pressure cylinder (20) is a planar structure, which is used to flatten the pre-bent wiring pins.

5. The automated spot welding equipment for motor parts according to claim 1, characterized in that, It also includes a welding box (3), which is covered on the frame, and the X-axis track (2) passes through the interior of the welding box (3); a second tray (11) is slidably arranged on the X-axis track (2), which is used to carry the product to move it under the welding machine (15) for welding; a positioning post (12) is provided on the second tray (11), which is used to cooperate with the hole inside the product to fix the product.

6. The automated spot welding equipment for motor parts according to claim 5, characterized in that, A lifting cylinder 2 (9) is connected below the second tray (11) to drive the second tray (11) to rise and fall; It also includes a rotary drive mechanism, which includes a cylindrical gear (10) disposed below the tray (11), a rack plate (14) meshing with the cylindrical gear (10), and an electric push rod (13) that drives the rack plate (14) to move linearly; the electric push rod (13) pushes the rack plate (14) to move and drives the cylindrical gear (10) to rotate, thereby adjusting the welding angle of the product.

7. The automated spot welding equipment for motor parts according to claim 1, characterized in that, It also includes a flipping mechanism, which is located at the intersection of the X-axis track (2) and the Y-axis track (1); the flipping mechanism includes a flipping cylinder (4) and a mounting plate (5) connected to the output end of the flipping cylinder (4), and two clamping cylinders (6) are mounted on the mounting plate (5), and the two clamping cylinders (6) are arranged opposite to each other to clamp the product.

8. The automated spot welding equipment for motor parts according to claim 7, characterized in that, It also includes a tray (8) and a lifting cylinder (7), both of which are provided in two sets; the two sets of the tray (8) and the lifting cylinder (7) are respectively set on the X-axis track (2) and the Y-axis track (1) to cooperate with the flipping mechanism to lift and receive the product.

9. An automated spot welding equipment for motor parts according to claim 3, characterized in that, The limiting groove (18) is opened in the vertical direction, and the sliding distance of the limiting block (26) in the limiting groove (18) is less than the maximum downward stroke of the output end of the welding machine (15).

10. An automated spot welding equipment for motor parts according to claim 6, characterized in that, The electric push rod (13) is fixedly installed on the lifting end of the second lifting cylinder (9) and moves up and down synchronously with the second tray (11).

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