Automatic bending and welding equipment for transformer

Abstract

The invention discloses automatic bending and welding equipment for a transformer, and belongs to the technical field of transformer production and processing, the automatic bending and welding equipment comprises a pin plate, a coil and a workbench, a control table is arranged on the surface of the edge of the workbench, a mounting groove is formed in the center of the workbench, a pin bending assembly is arranged in the mounting groove, and a pressing assembly is arranged above the mounting groove; two welding assemblies are arranged on the two sides of the mounting groove. Through the combined action of the pin bending assembly and the double-side welding assembly, full-automatic continuous operation of transformer pin bending and pin plate inserting and welding is achieved, the production efficiency is remarkably improved, through arrangement of the distance compensation assembly, position deviation caused by coil pin thickness tolerance can be automatically adapted and compensated, and the production efficiency is improved. Pins are effectively prevented from being pressed and damaged in the preforming and pressing process, and positioning and fixing of the coil and the pin plates in time sequence are achieved through linkage of the preforming pressing plate and the striker plate and an adjustable structure of the lateral positioning block.

Description

Technical Field

[0001] This invention relates to the field of transformer manufacturing and processing technology, and in particular to an automatic bending and welding equipment for transformers. Background Technology

[0002] A transformer is a component used for electrical energy conversion and distribution. It consists of a coil, a magnetic core, and a lead plate. During the production process, the flexible leads of the coil need to be bent and inserted into the corresponding sockets on the lead plate, and finally soldered to form a stable electrical connection. The lead plate needs to be inserted from bottom to top after the lead is bent. However, the existing transformer bending and welding equipment does not have the function of inserting the lead plate, which leads to poor connection between bending, insertion and welding processes. Multiple clamping or transfer is required, which not only increases the complexity of the equipment and the floor space, but may also cause deformation or displacement of the bent lead during the transfer process. Meanwhile, due to the material tolerances and manufacturing errors of the coil pins themselves, their thickness may vary slightly. If the rigid positioning and bending mechanism applies excessive pressure to such pins, the over-compressed parts will experience stress concentration, becoming potential fracture points. During subsequent transportation, vibration, or thermal expansion and contraction, fatigue fracture may occur. To address these issues, an automatic bending and welding device for transformers is proposed. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of poor process connection and potential damage to coil pins in the existing transformer bending and welding equipment, and to propose an automatic transformer bending and welding equipment.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An automatic bending and welding device for transformers includes a lead plate, a coil, and a worktable. The worktable has a control console on its edge surface, a mounting groove in its center, a lead bending assembly inside the mounting groove, a clamping assembly above the mounting groove, and two welding assemblies on both sides of the mounting groove. The pin bending assembly includes a central positioning block with limit slots on opposite sides. A distance compensation component is provided inside the central positioning block. A lifting push plate for matching the pin board is provided below the central positioning block. Pre-forming pressure plates are provided on both sides of the central positioning block. Lateral positioning blocks are provided at both ends of the central positioning block. A gap is formed between the lateral positioning blocks and the pre-forming pressure plates. A bending actuator driven by a motor is provided in the gap. The motor is located inside the worktable. The distance compensation component includes two main air chambers, which are respectively located inside the center positioning block near the two ends of the lateral positioning block. The bottom of the main air chamber passes through the worktable and is connected to the composite functional air source. The two sides of the main air chamber near the preformed pressure plate are provided with driving air chambers through the center positioning block. The output end of the driving air chamber is provided with a distance compensation plate. The welding assembly includes a linear module, which is fixedly connected to the worktable. The linear module is equipped with a welding slide, and the welding slide is equipped with a welding push cylinder. A welding gun is installed at the end of the welding push cylinder.

[0005] Preferably, the clamping assembly includes a clamping push cylinder fixed by a bracket, a positioning pressure plate is provided at the end of the clamping push cylinder, a flexible pad is provided at the center of the bottom of the positioning pressure plate, vertical limiting rods are provided at the four corners of the top of the positioning pressure plate, and plugs are provided at the ends of the vertical limiting rods. The positioning pressure plate is slidably connected to the outer pressure frame of the matching pin plate through the vertical limiting rods.

[0006] Preferably, the inner wall of the outer pressure frame is larger than the outer wall of the positioning plate, the top of the outer pressure frame is slidably connected to the vertical limiting rod, and a return spring is provided between the top of the outer pressure frame and the plug of the vertical limiting rod.

[0007] Preferably, the dimensions of the inner sidewall of the lifting push plate match the outer sidewall of the center positioning block in the standby state of the distance compensation component. Four combined push cylinders are provided at the bottom of the four corners of the lifting push plate. The combined push cylinders are fixedly installed below the worktable, and the piston rod end of the combined push cylinder passes through the worktable and is fixedly connected to the lifting push plate.

[0008] Preferably, the inner sidewall of the preforming plate is provided with a matching limiting slot and a preforming push cylinder installed inside the workbench on the outer sidewall of the preforming plate. The piston rod end of the preforming push cylinder is fixedly connected to the preforming plate. The top of the preforming plate is provided with a groove and a baffle plate is provided in the groove. The outer sidewall of the preforming plate is provided with a stroke limiting groove.

[0009] Preferably, the inner sidewall of the baffle plate is provided with a matching limiting slot, the outer sidewalls at both ends of the baffle plate are provided with spring cavities, a horizontal limiting rod is installed in the spring cavity, the horizontal limiting rod slides through the sidewall of the preformed pressure plate, and the end is provided with a plug with a matching stroke limiting slot, and the rod body of the horizontal limiting rod located in the spring cavity is fitted with a return spring.

[0010] Preferably, the outer wall of the lateral positioning block is provided with an opening and closing push cylinder, which is installed inside the worktable and its piston rod end is fixedly connected to the lateral positioning block.

[0011] Preferably, a piston rod is fixedly connected to the inner wall of the distance compensation plate, the piston rod is slidably connected to the driving air chamber, and a piston is fixedly installed at the end of the piston rod.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention achieves fully automated continuous operation of transformer pin bending, pin board insertion and welding through the combined action of the pin bending assembly and the double-sided welding assembly, which significantly improves production efficiency. Through the coordinated action of the center positioning block, the side positioning block and the lifting push plate, the pin bending accuracy and the pin board insertion reliability are ensured.

[0013] 2. By setting a distance compensation component, the present invention can automatically adapt to and compensate for positional deviations caused by coil pin thickness tolerances. It effectively prevents pin damage during preforming and pressing, while ensuring precise alignment of pins with pinboard sockets, thus improving product assembly quality and consistency.

[0014] 3. This invention achieves the positioning and fixing of the coil and the lead plate in sequence through the linkage of the pre-forming pressure plate and the baffle plate and the adjustable structure of the lateral positioning block, thus optimizing the smoothness of the connection between each process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an automatic bending and welding equipment for transformers proposed in this invention; Figure 2 This is an overall structural assembly drawing of an automatic bending and welding equipment for transformers proposed in this invention; Figure 3 This is a cross-sectional view of the internal structure of the control console in an automatic transformer bending and welding equipment proposed in this invention; Figure 4 This is a schematic diagram of the lifting push plate and the central positioning block in an automatic bending and welding equipment for transformers proposed in this invention; Figure 5 This is a structural assembly diagram of the lifting push plate and the central positioning block in an automatic bending and welding equipment for transformers proposed in this invention; Figure 6 This is a structural assembly drawing of the preformed pressure plate and the baffle plate in an automatic bending and welding equipment for transformers proposed in this invention; Figure 7 This is a schematic diagram of the clamping component in the standby state of an automatic bending and welding equipment for transformers proposed in this invention; Figure 8 This is a schematic diagram of the clamping component in the working state of an automatic bending and welding equipment for transformers proposed in this invention.

[0016] In the diagram: 1. Pinboard; 2. Coil; 3. Worktable; 301. Control console; 4. Center positioning block; 5. Lifting push plate; 6. Pre-forming pressure plate; 7. Lateral positioning block; 8. Bending actuator; 9. Main air chamber; 901. Drive air chamber; 10. Distance compensation plate; 11. Linear module; 12. Welding slide; 13. Welding torch; 14. Positioning pressure plate; 15. Flexible pad; 16. Vertical limit rod; 17. Outer pressure frame; 18. Baffle plate; 19. Stroke limiting groove; 20. Spring chamber; 21. Horizontal limit rod; 22. Piston connecting rod; 23. Piston. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] Example, refer to Figures 1 to 8 An automatic bending and welding equipment for transformers includes a lead plate 1, a coil 2 and a worktable 3. The surface of the edge of the worktable 3 is provided with a control console 301. The center of the worktable 3 is provided with a mounting groove, and a lead bending assembly is provided in the mounting groove. A clamping assembly is provided above the mounting groove to stabilize the lead plate 1 and the coil 2 during the bending process. Two welding assemblies are provided on both sides of the mounting groove. The welding assemblies are symmetrically arranged to achieve synchronous welding on both sides. The pin bending assembly includes a central positioning block 4. Limiting slots are provided on opposite sides of the central positioning block 4. A distance compensation component is provided inside the central positioning block 4. A lifting push plate 5 matching the pin plate 1 is provided below the central positioning block 4. After bending, the lifting push plate 5 can push the pin plate 1 to insert from bottom to top. Pre-forming pressure plates 6 are provided on both sides of the central positioning block 4 for preliminary positioning of the pins of the coil 2 before bending. Lateral positioning blocks 7 are provided at both ends of the central positioning block 4. The position can be adjusted according to the assembly process so that the pin plate 1 can slide along the central positioning block 4 to the surface of the lifting push plate 5. A gap is formed between the lateral positioning blocks 7 and the pre-forming pressure plates 6. A bending actuator 8 driven by a motor is provided in the gap. The bending actuator 8 completes the pin bending operation through rotational movement. The motor is located inside the worktable 3. The distance compensation component includes two main air chambers 9, which are respectively located inside the center positioning block 4 near the two ends of the side positioning block 7. The bottom of the main air chamber 9 passes through the worktable 3 and is connected to the composite function air source. The two sides of the main air chamber 9 near the preforming pressure plate 6 are provided with driving air chambers 901 through the center positioning block 4. The output end of the driving air chamber 901 is provided with a distance compensation plate 10. The distance compensation plate 10 can extend under air pressure to compensate for the distance of the coil 2 pins during the preforming and bending processes, so that it matches the socket of the pin plate 1. The welding assembly includes a linear module 11, which is fixedly connected to the worktable 3. The linear module 11 is provided with a welding slide 12, which is provided with a welding push cylinder. A welding gun 13 is installed at the end of the welding push cylinder.

[0021] Furthermore, the clamping assembly includes a clamping push cylinder fixed by a bracket. The end of the clamping push cylinder is provided with a positioning pressure plate 14. A flexible pad 15 is provided at the center of the bottom of the positioning pressure plate 14 to protect the surface of the coil 2. Vertical limiting rods 16 are provided at the four corners of the top of the positioning pressure plate 14. A plug is provided at the end of the vertical limiting rod 16. The positioning pressure plate 14 is slidably connected to the matching pin plate 1 with an outer pressure frame 17 through the vertical limiting rod 16. The inner side wall of the outer pressure frame 17 is larger than the outer side wall of the positioning pressure plate 14, allowing the outer pressure frame 17 to move independently outside the pressure plate. The top of the outer pressure frame 17 is slidably connected to the vertical limiting rod 16. A return spring is provided between the top of the outer pressure frame 17 and the plug of the vertical limiting rod 16, so that the outer pressure frame 17 and the positioning pressure plate 14 can perform graded actions. The further advantage of the above-mentioned method is that, through the combined use of the positioning pressure plate 14 and the outer pressure frame 17, the pin plate 1 and the coil 2 are pressed in stages, which can avoid damage to the coil 2 pins due to uneven pressure and ensure the stability and reliability of the pressing process.

[0022] It should be noted that the above-mentioned graded pressing process is as follows: During operation, the pressing cylinder first drives the outer pressing frame 17 to press down, stably pressing the pin plate 1 onto the lifting push plate 5 to complete the initial positioning. After the lateral positioning block 7 closes, the worker places the coil 2 and restarts the pressing assembly. At this time, the outer pressing frame 17 is blocked by the lateral positioning block 7, while the positioning plate 14 continues to descend and squeezes the reset spring here. Finally, the coil 2 is pressed onto the central positioning block 4 by the flexible pad 15. This process will not be described in detail below.

[0023] Furthermore, the dimensions of the inner wall of the lifting push plate 5 match the outer wall of the center positioning block 4 in the standby state of the distance compensation component. The locking block and the limiting slot cooperate to prevent the pin from entering the wrong position. Four combined push cylinders are provided at the bottom of the four corners of the lifting push plate 5. The combined push cylinders are fixedly installed below the worktable 3. The piston rod end of the combined push cylinder passes through the worktable 3 and is fixedly connected to the lifting push plate 5. This ensures that after the pin is bent and formed, the lifting push plate 5 can rise accurately and fit against the outer wall of the center positioning block 4 to form a complete guide surface. This allows the pin plate 1 to be reliably inserted into the bent pin from bottom to top. The synchronous drive of the four combined push cylinders ensures the smoothness and accuracy of the lifting process of the lifting push plate 5 and avoids the pin plate 1 from tilting or getting stuck during the insertion process. Furthermore, the inner wall of the preforming pressure plate 6 is provided with a locking block matching the limiting slot, and the outer wall of the preforming pressure plate 6 is provided with a preforming push cylinder installed inside the worktable 3. The piston rod end of the preforming push cylinder is fixedly connected to the preforming pressure plate 6. The top of the preforming pressure plate 6 is provided with a groove, and a baffle plate 18 is provided in the groove. The outer wall of the preforming pressure plate 6 is provided with a stroke limiting groove 19 to limit the movement range of the baffle plate 18. The inner wall of the baffle plate 18 is provided with a locking block matching the limiting slot, and both ends of the baffle plate 18 are provided with locking blocks matching the limiting slot. The outer side wall is provided with a spring cavity 20, and a horizontal limiting rod 21 is installed in the spring cavity 20. The horizontal limiting rod 21 slides through the side wall of the preformed pressure plate 6, and the end is provided with a plug matching the stroke limiting groove 19. When the plug of the horizontal limiting rod 21 contacts the inner wall of the stroke limiting groove 19 of the preformed pressure plate 6, it can limit the excessive extension of the baffle plate 18. The rod body of the horizontal limiting rod 21 located in the spring cavity 20 is fitted with a reset spring, which resets the baffle plate 18 to block the pin plate 1 when the preformed pressure plate 6 retracts. The further advantage of the above is that, through the synergistic action of the baffle plate 18 and the pre-forming pressure plate 6, the pre-forming pressure plate 6 can jointly clamp the coil 2 pin for pre-positioning when it moves forward; while when the pre-forming pressure plate 6 moves backward, the baffle plate 18 remains extended under the action of the reset spring, which can effectively block and position the placed pin plate 1, providing a positioning reference for subsequent insertion, and realizing the timing positioning of the coil 2 and the pin plate 1.

[0024] Furthermore, the outer wall of the lateral positioning block 7 is provided with an opening and closing push cylinder. The opening and closing push cylinder is installed inside the worktable 3, and its piston rod end is fixedly connected to the lateral positioning block 7. This allows the lateral positioning block 7 to flexibly adjust the space between itself and the central positioning block 4 according to different specifications of pin plates 1, so that the pin plates 1 can be smoothly placed and slid onto the surface of the lifting push plate 5. Furthermore, a piston rod 22 is fixedly connected to the inner wall of the distance compensation plate 10. The piston rod 22 is slidably connected to the driving air chamber 901. A piston 23 is fixedly installed at the end of the piston rod 22. The piston 23 and the driving air chamber 901 form a sealed air chamber. The further advantage of adopting the above is that by setting the main air chamber 9 and the piston connecting rod 22, a distance compensation system with uniform pressure is formed. By regulating the air pressure through the composite function air source, the distance compensation plate 10 can flexibly press against the pin of the coil 2. During the preforming process, the compressibility of the gas can be used to automatically compensate for the difference in pin thickness caused by the material tolerance of the coil 2, thereby preventing the pin of the coil 2 from being damaged by the preforming pressure plate 6. At the same time, it can ensure that the position of the pin is aligned with the insertion port of the pin plate 1, thereby improving the success rate of bending and insertion.

[0025] It should be noted that the console 301, motor, multi-functional air source, bending actuator 8, linear module 11, welding push cylinder, pressing push cylinder, combined push cylinder, pre-forming push cylinder and return spring mentioned above are all existing technologies. Among them, the composite function gas source can connect the main gas chamber 9 to a vacuum pump or air pump through the gas path switching device to achieve controllable input of positive and negative pressure. This is an existing function and will not be described in detail below.

[0026] When using this invention, the operator operates the device through the control console 301. First, an initialization and reset are performed. After the operator places the pin plate 1 on the lifting push plate 5, which has been lowered to the initial position (bottom of the mounting slot), the clamping assembly is activated, causing the clamping push cylinder to drive the positioning pressure plate 14 to move downward. The outer pressure frame 17 at its bottom contacts and stably presses the pin plate 1 onto the surface of the lifting push plate 5, thus completing the fixation of the pin plate 1. After the pinboard 1 is fixed, the operator precisely places the coil 2 on the central positioning block 4, so that the pins on both sides are located between the lateral positioning block 7 and the pre-formed pressure plate 6. At the same time, the composite function air source supplies air into the main air chamber 9, pushing the piston 23 and piston connecting rod 22, so that the distance compensation plate 10 extends flexibly from the side wall of the central positioning block 4, ensuring that all pins are in the ideal relative position with the corresponding socket on the pinboard 1 before bending, laying the foundation for subsequent insertion. Next, the pre-forming pressure plates 6 located on both sides of the central positioning block 4 move forward under the drive of the push cylinder. During the process, the baffle plate 18 and the pre-forming pressure plate 6 move forward synchronously as a whole. When the baffle plate 18 contacts the central positioning block 4, it will retract into the groove of the pre-forming pressure plate 6 under the action of the thrust, so that the positions of the baffle plate 18 and the protrusion of the central positioning block 4 are consistent. Finally, the baffle plate 18 and the locking block inside the pre-forming pressure plate 6 contact the pin of the coil 2 one after another to complete the straightening of the pin. At this stage, if the pin thickness is high, the compressibility of the gas allows the corresponding distance compensation plate 10 to retract moderately, thereby ensuring that the lateral pressure on the pin is always controlled within the safe threshold and avoiding damage to the pin of the coil 2. After the preforming process is completed, the baffle plate 18 and the protrusion of the preforming plate 6 together form a 90° reference edge. The pin that is pressed tightly by the preforming plate 6 has a bending position that is exactly close to the edge of the protrusion. Then, the bending actuator 8 located in the gap between the lateral positioning block 7 and the preforming plate 6 is driven by a motor to rotate in the gap between the preforming plate 6 and the central positioning block 4 and contact the pin from the side. As the actuator continues to rotate, the bending head applies force to the pin from top to bottom, forcing the pin to undergo plastic deformation around the edge of the protrusion of the preforming plate 6, and bending the pin along the edge of the protrusion into the required right angle shape. After the bending action is completed, the pre-forming pressure plate 6 retracts, and the composite functional air source connects the main air chamber 9 to the vacuum pump through the air path switching device to input negative pressure, so that each distance compensation plate 10 retracts under the action of negative pressure, thereby allowing the pin plate 1 to slide and rise along the central positioning block 4; Next, the preformed pressure plate 6 first moves back a certain distance. At this time, the baffle plate 18 inside the preformed pressure plate 6 remains extended under the action of the return spring, forming a fixed mechanical stop to prevent the lead plate 1 from being pushed out excessively. Subsequently, the four combined push cylinders simultaneously push up the lifting push plate 5. The lifting push plate 5 lifts the lead plate 1 and raises it smoothly along the central positioning block 4. Finally, all the leads that have been bent into right angles are inserted into the corresponding sockets on the lead plate 1 until the lead plate 1 is blocked by the baffle plate 18, realizing mechanical interconnection (plugging). After the plugging is completed, the preformed pressure plate 6 continues to move back until the preformed pressure plate 6 is completely reset, so that the baffle plate 18 also leaves the top of the lead plate 1, so that the part of the coil 2 lead that needs to be soldered is completely exposed. Once the pinboard 1 and the pins are fully inserted, the welding components located on both sides of the equipment begin to work. The welding slide 12, driven by the linear module 11, carries the welding torch 13 to the welding starting point. Subsequently, the welding push cylinder extends, allowing the end of the welding torch 13 to reach the optimal welding position. Finally, both welding torches 13 start simultaneously to perform synchronous welding at the connection between the pins and the pinboard 1, ensuring connection strength and consistency. After welding is completed, all actuators are reset in sequence, and then the operator can remove the assembled transformer and allow the equipment to enter the next work cycle.

[0027] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic bending and welding device for transformers, comprising a lead plate (1), a coil (2), and a worktable (3), characterized in that, The workbench (3) has a control console (301) on its edge surface, a mounting groove is provided in the center of the workbench (3), a pin bending assembly is provided in the mounting groove, a clamping assembly is provided above the mounting groove, and two welding assemblies are provided on both sides of the mounting groove. The pin bending assembly includes a central positioning block (4), with limit slots on opposite sides of the central positioning block (4), a distance compensation component inside the central positioning block (4), a lifting push plate (5) for matching the pin board (1) below the central positioning block (4), pre-forming pressure plates (6) on both sides of the central positioning block (4), and lateral positioning blocks (7) at both ends of the central positioning block (4). A gap is formed between the lateral positioning blocks (7) and the pre-forming pressure plates (6), and a bending actuator (8) driven by a motor is provided in the gap. The motor is located inside the worktable (3). The distance compensation component includes two main air chambers (9). The main air chambers (9) are respectively located inside the center positioning block (4) near the two ends of the side positioning block (7). The bottom of the main air chamber (9) passes through the worktable (3) and is connected to the composite functional air source. The two sides of the main air chamber (9) near the preformed pressure plate (6) pass through the center positioning block (4) and are provided with driving air chambers (901). The output end of the driving air chamber (901) is provided with a distance compensation plate (10). The welding assembly includes a linear module (11), which is fixedly connected to the worktable (3). The linear module (11) is provided with a welding slide (12), and the welding slide (12) is provided with a welding push cylinder. A welding gun (13) is installed at the end of the welding push cylinder.

2. The automatic bending and welding equipment for transformers according to claim 1, characterized in that, The clamping assembly includes a clamping push cylinder fixed by a bracket. The end of the clamping push cylinder is provided with a positioning pressure plate (14). A flexible pad (15) is provided at the center of the bottom of the positioning pressure plate (14). Vertical limiting rods (16) are provided at the four corners of the top of the positioning pressure plate (14). A plug is provided at the end of the vertical limiting rod (16). The positioning pressure plate (14) is slidably connected to the outer pressure frame (17) of the matching pin plate (1) through the vertical limiting rod (16).

3. The automatic bending and welding equipment for transformers according to claim 2, characterized in that, The inner wall of the outer pressure frame (17) is larger than the outer wall of the positioning pressure plate (14). The top of the outer pressure frame (17) is slidably connected to the vertical limiting rod (16). A reset spring is provided between the top of the outer pressure frame (17) and the plug of the vertical limiting rod (16).

4. The automatic bending and welding equipment for transformers according to claim 1, characterized in that, The inner wall of the lifting push plate (5) matches the outer wall of the center positioning block (4) in the standby state of the distance compensation component. The bottom of the four corners of the lifting push plate (5) is provided with four combined push cylinders. The combined push cylinders are fixedly installed below the worktable (3). The piston rod end of the combined push cylinder passes through the worktable (3) and is fixedly connected to the lifting push plate (5).

5. The automatic bending and welding equipment for transformers according to claim 1, characterized in that, The inner side wall of the preforming plate (6) is provided with a matching limiting slot and a preforming push cylinder installed inside the workbench (3) on the outer side wall of the preforming plate (6). The piston rod end of the preforming push cylinder is fixedly connected to the preforming plate (6). The top of the preforming plate (6) is provided with a groove and a baffle plate (18) is provided in the groove. The outer side wall of the preforming plate (6) is provided with a stroke limiting groove (19).

6. The automatic bending and welding equipment for transformers according to claim 5, characterized in that, The inner sidewall of the baffle plate (18) is provided with a matching limiting slot and a locking block. The outer sidewalls at both ends of the baffle plate (18) are provided with spring cavities (20). A horizontal limiting rod (21) is installed in the spring cavity (20). The horizontal limiting rod (21) slides through the sidewall of the preformed pressure plate (6) and has a plug with a matching stroke limiting groove (19) at its end. The rod body of the horizontal limiting rod (21) located in the spring cavity (20) is fitted with a reset spring.

7. The automatic bending and welding equipment for transformers according to claim 1, characterized in that, The outer wall of the lateral positioning block (7) is provided with an opening and closing push cylinder, which is installed inside the worktable (3) and its piston rod end is fixedly connected to the lateral positioning block (7).

8. The automatic bending and welding equipment for transformers according to claim 1, characterized in that, A piston rod (22) is fixedly connected to the inner wall of the distance compensation plate (10). The piston rod (22) is slidably connected to the driving air chamber (901). A piston (23) is fixedly installed at the end of the piston rod (22).

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