A self-adjusting stamping processing device for rail transit traction motor core

Abstract

This invention discloses a self-adjusting stamping processing device for traction motor cores in rail transit, relating to the field of motor cores. It aims to solve the problems of embedded iron filings and material plate movement during the stamping process of motor cores, which affect stamping accuracy and product quality. The device includes a stamping frame, a slider slidably connected within the frame, a stamping head fixedly connected to the bottom of the slider, an elastic pressure plate below the stamping head, a stamping table below the elastic pressure plate, a feeding platform on the side of the stamping table, a centrally located feeding guide at the feeding end of the feeding platform, and an adjusting roller frame at the discharging end of the feeding platform. The adjusting roller frame has a feeding pressure roller and a limiting pressure roller, an elastic support above the limiting pressure roller, a sliding plate slidably connected to the middle of the elastic support, a bellows fixedly connected to the lower end of the elastic support, and a high-pressure air duct fixedly connected to the side of the elastic support. The advantages are: automatic cleaning of iron filings on the surface of the material plate and dynamic limiting of the material plate, effectively improving stamping accuracy and product quality.

Description

Technical Field

[0001] This invention relates to the field of motor core technology, and in particular to a self-adjusting stamping process device for traction motor cores in rail transit. Background Technology

[0002] The core of a rail transit traction motor is made of high-permeability silicon steel sheets, which are stamped and then riveted together. The stamping quality has a decisive impact on the stacking coefficient, magnetic circuit uniformity, motor operating efficiency, and vibration and noise levels. In the current production process, a punch press, in conjunction with a progressive die, continuously punches the silicon steel sheet. The sheet is propelled forward station by station under the traction of a feeding mechanism, sequentially completing processes such as punching, grooving, trimming, and separation. However, existing stamping equipment has revealed key defects in practical applications, severely restricting product quality and production efficiency.

[0003] The problem of iron filings retention during stamping is particularly prominent. During the stamping process of silicon steel sheets, the shearing action between the die edge and the sheet inevitably generates tiny iron filings, burrs, and fragments of the detached silicon steel coating. Due to the lack of timely cleaning methods for the sheet surface in the stamping area in existing equipment, these particles remain on the sheet surface for extended periods. In subsequent stamping stations, when the blank holder or punch acts, the iron filings are forcibly pressed between the silicon steel sheet and the die. The high pressure during stamping causes the iron filings to embed into the surface of the silicon steel sheet, forming scratches, pits, and other physical damage. This not only damages the integrity of the insulating coating on the surface of the silicon steel sheet, leading to a decrease in inter-sheet insulation performance and increased eddy current losses in the core, but also affects the stacking coefficient and dimensional accuracy of the core, ultimately reducing the operating efficiency and reliability of the traction motor and exacerbating vibration and noise problems.

[0004] Meanwhile, the problem of lateral movement caused by insufficient limiting of the feed plate at the feeding end is equally serious. After rolling and uncoiling, the silicon steel sheet retains internal stress and surface tension. Under the instantaneous impact of the high-speed punch, the sheet moves longitudinally and laterally. Existing punch presses lack effective limiting devices at the feeding end; the sheet is positioned solely by the clamping of the feed rollers and the localized pressing of the die, lacking rigid constraints in the width and height directions. This lateral movement leads to deviations in the stamping pitch, causing misalignment of the stamping hole slots; it also causes localized warping and wrinkling of the sheet, affecting the flatness of subsequent sheets entering the die. In severe cases, it results in misalignment of stacked sheets, increased burrs on the stamped sheets, and uneven wear of the die cutting edges, further deteriorating product quality and equipment lifespan. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the present invention provides a self-adjusting stamping processing device for the iron core of rail transit traction motor. This design effectively solves the problems of iron filings embedding and material plate movement during the existing motor iron core stamping process, which affect the stamping accuracy and product quality of the motor iron core.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The present invention includes a stamping frame, a slider slidably connected inside the stamping frame, a stamping head fixedly connected to the bottom of the slider, an elastic pressure plate below the stamping head, a stamping table below the elastic pressure plate, a feeding platform of the same height on the side of the stamping table, a central feeding guide at the feeding end of the feeding platform, an adjusting roller frame at the discharge end of the feeding platform, a feeding pressure roller rotatably connected to one side of the adjusting roller frame, a limiting pressure roller rotatably connected to the other side of the adjusting roller frame, an elastic support above the limiting pressure roller, an upper end of the elastic support slidably connected to the stamping frame, a sliding plate slidably connected to the middle of the elastic support, a sliding plate fixedly connected to the slider, a bellows fixedly connected to the lower end of the elastic support, the bellows' air outlet facing the stamping table, and a high-pressure air duct connected to the bellows fixedly connected to the side of the elastic support. During the stamping process, the downward movement of the slider drives the limiting pressure roller to press the sheet metal downward through the sliding plate and the elastic support.

[0007] Preferably, the elastic support includes a fixed frame, a support rod is fixedly connected to the fixed frame, a support beam is fixedly connected to the side of the stamping frame, the support beam is provided with a through hole for the support rod to slide, a first baffle is fixedly connected to the support rod above the support beam, a second baffle is fixedly connected to the support rod between the support beam and the slide plate, a return spring is provided above the second baffle, and a lifting spring is provided below the second baffle.

[0008] Preferably, the bottom of the air box is provided with an adjusting pressure roller, which is located diagonally above the limiting pressure roller.

[0009] Preferably, the adjusting roller frame includes a support shaft, the support shaft is provided with two sets of symmetrically distributed adjusting sleeves, the adjusting sleeves are connected to the support shaft by fixing bolts, a connecting plate is rotatably connected inside the adjusting sleeve, and a torsion spring is installed between the adjusting sleeve and the connecting plate.

[0010] Preferably, the feeding roller is located inside the connecting plate, and a roller is rotatably connected to the outside of the connecting plate. The roller and the feeding roller are placed coaxially, the distance between the two rollers is equal to the width of the material plate, and the radius difference between the roller and the feeding roller is equal to the thickness of the material plate.

[0011] Preferably, the central feed guide includes two sets of rotating bases, the rotating bases are rotatably connected to the feed table, the upper side of the rotating base is provided with a limiting groove, the limiting groove is fitted with a limiting pin, the limiting pin is fixedly connected to the feed table, an adjusting plate is fixedly connected to the rotating base, and a lateral pressure roller is rotatably connected to the adjusting plate.

[0012] Preferably, the adjusting plate is provided with a plurality of arrayed fixing holes, and the roller shaft of the lateral pressure roller is fixedly connected to the fixing holes.

[0013] Preferably, a traction spring is fixedly connected to the rotating base, and an adjusting guide plate is fixedly connected to the other end of the traction spring. An annular pulley is provided in the middle of the traction spring, and the middle of the traction spring passes around the rotating base and the annular pulley.

[0014] Preferably, a guide rod is fixedly connected to the outer side of the adjusting guide plate, and a side support plate is slidably connected to the guide rod. The side support plate is fixedly connected to the feeding table. A fixing nut is fixedly threaded onto the guide rod on the outer side of the side support plate. A first spring is provided on the guide rod on the inner side of the side support plate. A guide groove through which the feeding plate passes is provided on the inner side of the adjusting guide plate, and a sliding roller is provided on the inner side of the guide groove.

[0015] Preferably, the elastic pressure plate has a through groove in the middle for the punch head to pass through, a support column is fixedly connected to the elastic pressure plate, the support column is slidably connected to the slider, and a second spring is provided on the support column below the slider.

[0016] Compared with the prior art, the outstanding advantages of this invention are: This invention cleans iron filings from the surface of the material plate using a bellows and a high-pressure air duct. Specifically, the bellows descends synchronously with the stamping process via an elastic support, and the high-pressure airflow precisely sweeps the stamping area, promptly removing iron filings and debris and preventing them from being pressed into the silicon steel sheet, thus significantly improving the surface quality and insulation performance of the iron core laminations.

[0017] This application utilizes the coordinated action of the feed guide roller, adjusting roller frame, feed pressure roller, limiting pressure roller, and adjusting pressure roller to achieve multi-point pressing and limiting of the material plate in the width direction, vertical direction, and feed direction, effectively suppressing material plate movement and warping, ensuring the accuracy of stamping pitch and slot position, thereby improving the stacking coefficient and dimensional consistency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall first axial side structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the overall second axial side structure of the present invention.

[0020] Figure 3 This is a schematic cross-sectional view of the stamping frame of the present invention.

[0021] Figure 4 This is a schematic diagram of the elastic support structure of the present invention.

[0022] Figure 5 This is a schematic diagram of the upper structure of the feeding platform of the present invention.

[0023] Figure 6This is a schematic diagram of the rotating base connection structure of the present invention.

[0024] Figure 7 This is a top view of the central feed guide of the present invention.

[0025] Figure 8 This is a schematic diagram of the overall structure of the adjusting roller frame of the present invention.

[0026] Figure 9 This is a schematic diagram of the left-side structure of the connecting plate of the present invention.

[0027] Figure 10 This is a schematic diagram of the axial structure of the connecting plate of the present invention.

[0028] The diagram labels are as follows: 1. Stamping frame; 2. Slider; 3. Stamping head; 4. Elastic pressure plate; 5. Stamping table; 6. Feeding table; 7. Centered feed guide; 701. Rotary base; 702. Limiting slot; 703. Limiting pin; 704. Adjusting plate; 705. Side pressure roller; 706. Fixing hole; 707. Traction spring; 708. Adjusting guide plate; 709. Annular pulley; 8. Adjusting roller frame; 801. Support shaft; 802. Adjusting sleeve; 803. Fixing bolt; 804. Connecting plate; 805. Torsion spring; 806. 9. Roller; 10. Feed roller; 11. Limiting roller; 12. Elastic bracket; 13. Fixed frame; 14. Support rod; 15. Support beam; 16. First baffle; 17. Second baffle; 18. Return spring; 19. Lifting spring; 20. Slide plate; 21. Air box; 22. High-pressure air duct; 23. Adjusting roller; 24. Guide rod; 25. Side support plate; 26. Fixing nut; 27. First spring; 28. Guide groove; 29. ​​Sliding roller; 20. Support column; 21. Second spring. Detailed Implementation

[0029] The technical solutions of 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. 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.

[0030] Please see the appendix Figure 1-10This embodiment discloses a self-adjusting stamping processing device for the iron core of a rail transit traction motor: It includes a stamping frame 1, a slider 2 slidably connected inside the stamping frame 1, a stamping head 3 fixedly connected to the bottom of the slider 2, an elastic pressure plate 4 below the stamping head 3, a stamping table 5 below the elastic pressure plate 4, a feeding platform 6 of the same height on the side of the stamping table 5, a centrally located feeding guide 7 at the feeding end of the feeding platform 6, and an adjusting roller frame 8 at the discharge end of the feeding platform 6. A feeding pressure roller 9 is rotatably connected to one side of the adjusting roller frame 8, and a feeding pressure roller 9 is rotatably connected to the other side of the adjusting roller frame 8. A limiting pressure roller 10 is connected, and an elastic support 11 is provided above the limiting pressure roller 10. The upper end of the elastic support 11 is slidably connected to the stamping frame 1, and a sliding plate 12 is slidably connected to the middle of the elastic support 11. The sliding plate 12 is fixedly connected to the slider, and a bellows 13 is fixedly connected to the lower end of the elastic support 11. The air outlet of the bellows 13 faces the stamping table 5. A high-pressure air pipe 14 communicating with the bellows 13 is fixedly connected to the side of the elastic support 11. During the stamping process, the downward movement of the slider drives the limiting pressure roller 10 to press the sheet material downward through the sliding plate 12 and the elastic support 11.

[0031] For ease of understanding, the following explains some key terms in this embodiment: Stamping frame 1: As the overall support structure of the equipment, it is used to support the stamping mechanism and related components, and provide a stable working environment.

[0032] Slider 2: A component that reciprocates along a preset path within the stamping frame 1, and its motion trajectory guides the up and down stroke of the stamping head 3.

[0033] Punching head 3: Fixedly connected to the bottom of slider 2, it directly acts on the sheet metal to be punched, and completes punching, blanking and other processing operations.

[0034] Elastic pressure plate 4: Located below the stamping head 3, it applies elastic pressure to the sheet metal during the stamping process to assist in the positioning and clamping of the sheet metal.

[0035] Pressing table 5: Used in conjunction with elastic pressure plate 4, it serves as a support surface for the sheet metal and bears the force of the pressing head 3.

[0036] Feeding platform 6: Located on the side of the stamping table 5, at the same height as the stamping table 5, it is used to support the sheet material to be stamped and guide it into the stamping area.

[0037] Centering feed guide 7: Located at the feed end of the feed table 6, it is used to guide the sheet material to automatically center in the area of ​​the feed table 6.

[0038] Adjusting roller frame 8: Located at the discharge end of the feeding platform 6, it is used to support and adjust the positions of the feeding pressure roller 9 and the limiting pressure roller 10.

[0039] Feed roller 9: Rotatably connected to one side of the adjusting roller frame 8, it applies pressure to the sheet material and assists in the conveying and positioning of the sheet material.

[0040] Limiting roller 10: Rotatably connected to the other side of the adjusting roller frame 8, it limits and constrains the sheet material to prevent it from moving during the stamping process.

[0041] Elastic support 11: It is set above the limiting pressure roller 10. Its upper end is slidably connected to the stamping frame 1, its middle part is slidably connected to the slide plate 12, and its lower end is fixedly connected to the air box 13. It is used to support the limiting pressure roller 10 and realize its elastic adjustment during the stamping process.

[0042] Slide 12: It is slidably connected to the middle of the elastic bracket 11 and fixedly connected to the slider, and is used to transmit the movement of the slider to the elastic bracket 11 and the limiting pressure roller 10.

[0043] Air box 13: It is fixedly connected to the lower end of the elastic bracket 11, and its air outlet faces the stamping table 5. It is used to generate airflow to clean the stamping area.

[0044] High-pressure air duct 14: It is fixedly connected to the side of the elastic support 11 and communicates with the air box 13, and is used to deliver high-pressure gas to the air box 13.

[0045] This application provides a self-adjusting stamping processing device for the iron core of a traction motor in rail transit. The main structure of the device includes a stamping frame 1, which serves as the skeleton of the device. Inside the stamping frame 1, a slider 2 for guiding movement is provided. The slider 2 can slide vertically, and the drive mechanism above it is the same as the structure on an existing stamping machine. At the bottom of the slider 2, a stamping head 3 is fixedly connected. The stamping head 3 is a component that directly stamps the sheet metal, and its shape and size are customized according to the requirements of the stamped part.

[0046] Below the stamping head 3, an elastic pressure plate 4 is provided, which applies a certain pre-pressure to the sheet metal during the stamping process to assist in the positioning of the sheet metal. Below the elastic pressure plate 4, a stamping table 5 is provided. The stamping table 5 serves as the support surface for the sheet metal and the bearing surface for the lower die. The stamping table 5 is a sturdy cast iron platform used to withstand the force of the stamping head 3. On the side of the stamping table 5, a feeding platform 6 of the same height is provided. The feeding platform 6 is a conveying platform flush with the stamping table 5, used to carry the sheet metal to be stamped. At the feeding end of the feeding platform 6, a central feeding guide 7 is provided. The central feeding guide 7 consists of one or more pairs of simple cylindrical rollers, used to guide the sheet metal smoothly into the area of ​​the feeding platform 6.

[0047] At the discharge end of the feeding platform 6, an adjusting roller frame 8 is provided to support the subsequent feeding pressure roller 9 and the limiting pressure roller 10. The feeding pressure roller 9 is mounted on the adjusting roller frame 8 via bearings and is used to apply downward pressure to the plate during the conveying process. The limiting pressure roller 10 is located on the opposite side of the feeding pressure roller 9.

[0048] Above the limiting pressure roller 10, an elastic support 11 is provided. The upper end of the elastic support 11 is slidably connected to the stamping frame 1, allowing the elastic support 11 to move up and down within a certain range. A sliding plate 12 is slidably connected to the middle of the elastic support 11. The sliding plate 12 is connected to the elastic support 11 via a groove, and its side is fixedly connected to the slider. This connection method allows the vertical movement of the slider to be transmitted to the elastic support 11.

[0049] A bellows 13 is fixedly connected to the lower end of the elastic support 11. The bellows 13 can be a simple airflow generating device, with its air outlet facing the stamping table 5. The function of the bellows 13 is to generate airflow in the stamping area to blow away iron filings from the surface of the sheet metal. A high-pressure air duct 14, communicating with the bellows 13, is fixedly connected to the side of the elastic support 11. The high-pressure air duct 14 can be a flexible or rigid pipe used to introduce an external high-pressure air source into the bellows 13.

[0050] During the stamping process, the downward movement of the slider drives the limiting pressure roller 10 to press the sheet metal downwards via the slide plate 12 and the elastic support 11. Specifically, when the stamping head 3 moves downwards with the slider, the slide plate 12 also moves downwards, causing the elastic support 11 to drive the limiting pressure roller 10 below it to move downwards synchronously under its elastic force. During the downward movement, the limiting pressure roller 10 applies vertical pressure to the sheet metal entering the stamping area, achieving pressing and limiting of the sheet metal. At the same time, the air box 13 also moves downwards under the drive of the elastic support 11, with its air outlet closer to the stamping area, enabling more effective blowing of the sheet metal surface and removal of iron filings generated during the stamping process.

[0051] The self-adjusting stamping equipment proposed in this application achieves automatic cleaning of the surface of the core plate of the rail transit traction motor and effective limiting of the feeding end by using the elastic support 11 to drive the air box 13 and the limiting pressure roller 10 to move synchronously during the stamping process. This equipment can promptly blow away stamping chips, preventing them from remaining on the surface of the plate and causing scratches and damage, thereby improving the surface quality and insulation performance of the core laminations. Simultaneously, the limiting pressure roller 10 presses the plate during stamping, effectively suppressing the plate's movement and warping, ensuring the accuracy of the stamping pitch and slot positions, and thus improving the stacking coefficient and dimensional consistency of the core, meeting the production requirements of high-precision core laminations for rail transit traction motors.

[0052] This application further proposes that the elastic support 11 includes a fixed frame 1101. The fixed frame 1101 is the main structure of the elastic support 11, ensuring the rigidity and stability of the entire elastic support 11 during movement. A support rod 1102 is fixedly connected to the fixed frame 1101, serving as a guide for the vertical movement of the elastic support 11. The support rod 1102 can be made of wear-resistant metal to ensure its durability and stability during sliding. A support beam 1103 is fixedly connected to the side of the stamping frame 1, providing a stable sliding guide interface for the support rod 1102. The support beam 1103 can be fixed using bolts, welding, etc., to ensure its firmness during equipment operation. The support beam 1103 has a through hole for the support rod 1102 to slide through. This through hole is a hole on the support beam 1103 that mates with the support rod 1102, ensuring that the support rod 1102 can slide smoothly and without jamming within it. The size and shape of the through hole match the support rod 1102 to provide precise guidance, limiting the lateral sway of the elastic support 11 and allowing it to move only in the vertical direction. A first baffle 1104 is fixedly connected to the support rod 1102 above the support beam 1103. The first baffle 1104 is typically a plate-like structure, fixed to the upper part of the support rod 1102, and its function is to act as a limiting device for the downward movement of the elastic support 11. When the elastic support 11 moves downward to a preset position, the first baffle 1104 will contact the upper surface of the support beam 1103, thereby preventing the elastic support 11 from continuing to move downward and preventing damage to the sheet material. A second baffle 1105 is fixedly connected to the support rod 1102 between the support beam 1103 and the slide plate 12. The second baffle 1105 is also a plate-like structure, fixed to the middle of the support rod 1102, located between the support beam 1103 and the slide plate 12, and a return spring 1106 is provided above the second baffle 1105. The return spring 1106 is typically a compression spring, installed between the support beam 1103 and the second stop plate 1105. Its function is to provide a downward elastic force when the stamping head 3 presses downwards, causing the elastic support 11 to move downwards to ensure that the limiting pressure roller 10 presses down in time, thus ensuring the flatness of the sheet metal during stamping. A lifting spring 1107 is located below the second stop plate 1105. The lifting spring 1107 is also typically a compression spring, installed between the second stop plate 1105 and the slide plate 12. Its function is that during the lifting process, when the slider 2 moves upwards, the lifting spring 1107 provides a certain upward elastic force. When the force of the lifting spring 1107 is greater than that of the return spring 1106, the adjusting pressure roller 15 and the limiting pressure roller 10 move upwards, and the sheet metal is fed inwards, preparing for the next stamping.

[0053] Through the above technical solution, the motion stability, accuracy, and reliability of the elastic support 11 are significantly improved. Specifically, the fixed frame 1101, support rod 1102, support beam 1103, and through hole together constitute a precise linear guide mechanism, ensuring that the elastic support 11 can slide smoothly and without deviation in the vertical direction, effectively avoiding the problem of uneven pressing force of the limiting pressure roller 10 on the sheet metal caused by lateral swaying. The first baffle 1104 and the second baffle 1105 act as mechanical limits, precisely limiting the vertical movement range of the elastic support 11 and preventing over-punching or dislocation. The return spring 1106 provides a downward return force when the stamping falls, allowing the limiting pressure roller 10 to move downward. The pressing effect of the limiting pressure roller 10 on the sheet metal is more stable and controllable, ensuring the flatness of the sheet metal during the impact process. At the same time, the lifting spring 1107 provides a force for the elastic support 11 to move upward, the limiting pressure roller 10 reduces the pressure on the sheet metal, and the sheet metal is fed forward to prepare for the next stamping. This structured guiding and elastic support system makes the pressing action of the limiting pressure roller 10 on the sheet metal more stable and controllable, thereby significantly improving the precision and quality of the stamping process of the traction motor core for rail transit.

[0054] This application further proposes that an adjusting pressure roller 15 be provided at the bottom of the bellows 13, and the adjusting pressure roller 15 be located obliquely above the limiting pressure roller 10, such as Figure 9 As shown, in the initial state, the feeding pressure roller 9 and the adjusting roller frame 8 tend to rotate counterclockwise, and the limiting pressure roller 10 is in a state away from the upper surface of the material plate. The adjusting pressure roller 15 is set obliquely above the limiting pressure roller 10 to ensure that when the adjusting pressure roller 15 moves downward, it overcomes the action of the adjusting roller frame 8 and drives the limiting pressure roller 10 to rotate downward, completing the pressing state of the material plate. At this time, the limiting pressure roller 10 provides a stronger and more precise final pressing force to ensure the absolute stability of the material plate at the moment of stamping. In addition, when the adjusting pressure roller 15 returns upward, the limiting pressure roller 10 performs a counterclockwise rotation to reset.

[0055] This application further proposes that the adjusting roller frame 8 includes a support shaft 801. The support shaft 801 is the core load-bearing component of the adjusting roller frame 8, typically a horizontally arranged rod, whose function is to provide a stable mounting base and rotation center for other components on the adjusting roller frame 8, ensuring the rigidity and stability of the entire roller frame structure. Two sets of symmetrically distributed adjusting sleeves 802 are provided on the support shaft 801, with the center of the stamping head 3 as the reference plane. The adjusting sleeves 802 are sleeve structures that can move and be fixed along the support shaft 801; their symmetrical distribution aims to ensure precise centering of the sheet metal when entering the stamping area. By adjusting the position of the two sets of adjusting sleeves 802, sheet metal of different widths can be accommodated, achieving width adjustment and centering of the sheet metal. A fixing bolt 803 connects the adjusting sleeves 802 to the support shaft 801. The fixing bolt 803 is used to securely lock the adjusting sleeve 802 onto the support shaft 801 after it has been adjusted to the desired position, preventing displacement due to vibration or force during equipment operation, thereby ensuring the accuracy and stability of the sheet metal positioning. A connecting plate 804 is rotatably connected inside the adjusting sleeve 802. The connecting plate 804 is a component installed inside the adjusting sleeve 802 and can rotate relative to it. Its function is to support the subsequent pressure roller or guide component, and through its rotational capability, to allow the pressure roller to contact the sheet metal at a certain angle or pressure, achieving flexible guidance. A torsion spring 805 is installed between the adjusting sleeve 802 and the connecting plate 804. The torsion spring 805 is an elastic element that provides torque, installed between the adjusting sleeve 802 and the connecting plate 804, and its function is to provide a preset elastic restoring force or clamping force to the connecting plate 804. This allows the connecting plate 804 to maintain a certain pressure when in contact with the sheet material, while allowing it to make fine adjustments when the width or thickness of the sheet material fluctuates slightly, thereby achieving stable and flexible clamping and guidance of the sheet material and avoiding damage to the sheet material.

[0056] This application further proposes that the feeding roller 9 is located inside the connecting plate 804, and a roller 806 is rotatably connected to the outside of the connecting plate 804. The roller 806 is placed coaxially with the feeding roller 9, the distance between the two rollers 806 is equal to the width of the material plate, and the radius difference between the roller 806 and the feeding roller 9 is equal to the thickness of the material plate.

[0057] Specifically, the feed roller 9 is positioned inside the connecting plate 804, i.e., closer to the centerline of the sheet material. This arrangement allows the feed roller 9 to act directly on the central area of ​​the sheet material, providing the main downward clamping force and ensuring initial horizontal positioning and stable vertical support. The connecting plate 804, as a support structure, provides a stable foundation for the installation and rotation of the feed roller 9. On the outer side of the connecting plate 804, i.e., away from the centerline of the sheet material, rollers 806 are rotatably connected. These rollers 806 are typically arranged in pairs to contact the side edges of the sheet material. Their main function is to provide lateral guidance and support, preventing lateral deviation of the sheet material during feeding. The rollers 806 can be made of wear-resistant materials to reduce wear on the sheet material edges. The rollers 806 and the feed roller 9 are designed to be coaxial, i.e., their axes of rotation coincide. This coaxial design ensures that the rollers 806 and the feed roller 9 move synchronously during rotation, forming a unified feeding unit. This helps maintain the stability of the sheet metal in the feeding direction, avoiding sheet metal twisting or jamming caused by inconsistent rotation speeds of different components. The distance between the two rollers 806 is precisely set to be equal to the width of the sheet metal to be processed. This means that the rollers 806 can closely fit the two edges of the sheet metal, providing precise lateral restraint. When the width of the sheet metal changes, the spacing of the rollers 806 can be adjusted accordingly to accommodate different sheet metal specifications, thereby achieving adaptive width positioning of the sheet metal. The difference in radius between the rollers 806 and the feed roller 9 is designed to be equal to the thickness of the sheet metal to be processed. This design ensures that when the rollers 806 contact the upper surface of the sheet metal, the feed roller 9 can simultaneously contact the lower surface of the sheet metal (or vice versa) and apply appropriate clamping force. Through this matching of radius differences, the equipment can automatically adjust the clamping state according to the actual thickness of the sheet metal, achieving adaptive thickness clamping of the sheet metal and ensuring the stability and flatness of the sheet metal in the vertical direction.

[0058] This application further proposes that the central feeding guide 7 includes two sets of rotating bases 701, the rotating bases 701 are rotatably connected to the feeding table 6, the upper side of the rotating base 701 is provided with a limiting groove 702, the limiting groove 702 is fitted with a limiting pin 703, the limiting pin 703 is fixedly connected to the feeding table 6, an adjusting plate 704 is fixedly connected to the rotating base 701, and a lateral pressure roller 705 is rotatably connected to the adjusting plate 704.

[0059] Among them, the two sets of rotating bases 701 are the core components used to support and position the centering feed guide 7. The "two sets" arrangement means they are symmetrically distributed on both sides of the feed table 6, guiding and supporting both sides of the sheet material respectively. The rotating bases 701 can be made of materials with certain strength and wear resistance to ensure stability and reliability during long-term use. Their main function is to provide a rotatable mounting platform for the subsequent adjusting plate 704 and lateral pressure rollers 705, thereby enabling flexible adjustment of the sheet material's lateral position.

[0060] The rotatable connection between the slewing base 701 and the feed table 6 allows the slewing base 701 to rotate around an axis within the plane of the feed table 6. This rotatable connection allows for easy adjustment of the angle of the slewing base 701, thereby changing the relative positions of the adjusting plate 704 and the lateral pressure roller 705 mounted on it to accommodate sheets of different widths and achieve precise lateral guidance of the sheet material.

[0061] The limiting slot 702 is located on the side of the rotary base 701, while the limiting pin 703 is fixedly connected to the feed table 6 and engages within the limiting slot 702. When the rotary base 701 rotates, the limiting pin 703 slides within the limiting slot 702 and engages at a specific position, thereby achieving precise locking of the rotation angle of the rotary base 701 and preventing the rotary base 701 from rotating too much.

[0062] The adjusting plate 704 is a plate-shaped structure fixed on the rotating base 701. Its main function is to serve as a mounting carrier for the lateral pressure roller 705 and to provide further adjustment capabilities. The lateral pressure roller 705 is mounted on the adjusting plate 704 and rotatably connected to it. This means that the lateral pressure roller 705 can rotate freely to reduce friction when in contact with the sheet metal, protecting the sheet metal surface. Through the cooperation of the adjusting plate 704 and the rotating base 701, the lateral pressure roller 705 can apply lateral pressure to the sheet metal entering the stamping area, precisely confining it within the preset feed channel and preventing lateral deviation of the sheet metal.

[0063] This application further proposes that the aforementioned adjusting plate 704 is provided with a plurality of arrayed fixing holes 706, and the roller shaft of the lateral pressure roller is fixedly connected to the fixing holes 706. Specifically, the plurality of arrayed fixing holes 706 provided on the adjusting plate 704 refers to a series of holes arranged on the surface of the adjusting plate 704. These fixing holes 706 provide preset and selectable installation positions for the roller shaft of the lateral pressure roller. By selecting different fixing holes 706, precise and discrete adjustment of the position of the lateral pressure roller can be achieved. The fixed connection between the roller shaft of the lateral pressure roller and the fixing holes 706 means that a stable and immovable connection is formed between the roller shaft and the fixing holes 706.

[0064] This application further proposes that, based on the aforementioned central feed guide 7, a traction spring 707 is fixedly connected to the rotating base 701, and an adjusting guide plate 708 is fixedly connected to the other end of the traction spring 707. An annular pulley 709 is provided in the middle of the traction spring 707, and the middle portion of the traction spring 707 passes around the rotating base 701 and the annular pulley 709. Specifically, the traction spring 707 is an elastic element capable of providing tensile force, with one end fixedly connected to the rotating base 701 and the other end connected to the adjusting guide plate 708. The function of the traction spring 707 is to apply a continuous tension to the adjusting guide plate 708, thereby indirectly or directly affecting the lateral pressure or position of the lateral pressure roller 705 on the sheet material. By selecting traction springs 707 with different stiffness or preload, the lateral pressure applied to the lateral pressure roller 705 can be adjusted to accommodate sheets of different thicknesses or materials and to compensate for minor deviations in the sheet width. The adjusting guide plate 708, serving as the force-bearing end of the traction spring 707, can be a plate-shaped component or a guide bracket. It moves or is positioned by the tension of the traction spring 707, thereby driving or influencing the posture or position of the lateral pressure roller 705 to achieve precise guidance of the sheet material. The annular pulley 709 provides a smooth path for the traction spring 707. Located in the middle of the traction spring 707, it allows the middle of the traction spring 707 to bypass the rotating base 701 and the annular pulley 709. The function of the annular pulley 709 is to change the direction of the force on the traction spring 707 or reduce the frictional resistance of the traction spring 707 during movement, ensuring that the traction spring 707 can smoothly and effectively transmit the tension to the adjusting guide plate 708, thus guaranteeing the stability and responsiveness of the lateral pressure roller 705.

[0065] This application further proposes that the outer side of the aforementioned adjusting guide plate 708 is fixedly connected to a guide rod 16, the guide rod 16 is slidably connected to a side support plate 17, the side support plate 17 is fixedly connected to the aforementioned feeding table 6, the outer side of the side support plate 17 is fixedly threaded with a fixing nut 18, the inner side of the side support plate 17 is provided with a first spring 19 on the guide rod 16, the inner side of the adjusting guide plate 708 is provided with a guide groove 20 through which the feeding plate passes, and the inner side of the guide groove 20 is provided with a sliding roller 21.

[0066] Specifically, the guide rod 16 is typically a slender rod-shaped structure, its main function being to provide stable sliding support and a precise guiding path for the adjusting guide plate 708. It can be cylindrical, square, or other cross-sectional shapes, and is usually made of wear-resistant, low-friction materials, such as surface-treated steel or engineering plastics, to ensure smooth, unimpeded movement of the adjusting guide plate 708. The guide rod 16 ensures the straightness and stability of the adjusting guide plate 708 during lateral movement. The side support plate 17 is a component used to fix the guide rod 16 and provide structural support. It is typically securely connected to the feed table 6 or other main equipment structure by bolts, welding, or other fixing methods to ensure the stability and rigidity of the entire guiding mechanism. The rigidity of the side support plate 17 is crucial for maintaining the precise position of the guide rod 16, thus indirectly affecting the lateral positioning accuracy of the sheet metal. The fixing nut 18, through a threaded connection with the guide rod 16, enables precise adjustment and locking of the effective length of the guide rod 16 or the position of the adjusting guide plate 708. By tightening or loosening the fixing nut 18, the extension length of the guide rod 16 on the side support plate 17 can be finely adjusted, thereby changing the lateral limiting or preload force on the adjusting guide plate 708 to adapt to sheet metal of different widths or different lateral positioning requirements. This threaded adjustment method provides precise and reliable positioning capability. The first spring 19 is provided on the guide rod 16, and its function is to provide elastic preload force or buffer force. When there are slight fluctuations in the width of the sheet metal, the first spring 19 can elastically compress or extend, so that the adjusting guide plate 708 can automatically adapt to the actual width of the sheet metal, always maintaining a stable lateral contact pressure on the sheet metal, and avoiding gaps or excessive compression of the sheet metal due to width changes. At the same time, it can also absorb the lateral impact that may be generated during the feeding process of the sheet metal, improving the smoothness of the guide. The guide groove 20 is a groove-shaped structure on the inner side of the adjusting guide plate 708 specifically designed for the sheet metal to pass through. Its shape and size should match the side profile of the sheet metal to be stamped, providing precise lateral limiting and guiding channels for the sheet metal. The flatness and machining accuracy of the guide groove 20 directly affect the smoothness of sheet metal feeding and the final stamping positioning accuracy. The sliding roller 21 is located inside the guide groove 20, and its main function is to reduce the friction generated when the sheet metal moves along the inner wall of the guide groove 20. The sliding roller 21 is usually made of wear-resistant material and can rotate freely. When the sheet metal passes through, the sliding roller 21 rotates accordingly, converting sliding friction into rolling friction, thereby significantly reducing frictional resistance and ensuring that the sheet metal can pass smoothly and unimpeded through the guide groove 20, avoiding scratches or jamming on the sheet metal surface.

[0067] The elastic pressure plate 4 has a through groove in the middle for the punch head 3 to pass through. A support column 22 is fixedly connected to the elastic pressure plate 4. The support column 22 is slidably connected to the slider. A second spring 23 is provided on the support column 22 below the slider.

[0068] Specifically, the elastic pressure plate 4 has a through slot in its center for the punch head 3 to pass through. This through slot is a hole or opening in the central area of ​​the elastic pressure plate 4, its main function being to allow the punch head 3 to pass smoothly through the elastic pressure plate 4 during the punching operation and directly act on the sheet metal to be punched. A support column 22 is fixedly connected to the elastic pressure plate 4. The support column 22 is a structural component fixed to the elastic pressure plate 4, used for force transmission and guidance. Its function is to provide stable support and guidance for the elastic pressure plate 4, enabling it to move smoothly in the vertical direction. Through the support column 22, the movement trajectory of the elastic pressure plate 4 can be effectively constrained, preventing it from tilting or deviating during the punching process. The support column 22 is slidably connected to the slider. Sliding connection refers to the connection method where the support column 22 and the slider achieve relative movement through mating surfaces. This ensures that the elastic pressure plate 4 can make precise vertical displacement according to the punching requirements and provides necessary pre-pressure or buffering. A second spring 23 is provided on the support column 22 below the slider. The second spring 23 is an elastic element located below the slider and on the support column 22. The main function of the second spring 23 is to provide a downward restoring force or preload force for the elastic pressure plate 4.

[0069] The following example will provide a more detailed explanation of the above technical solution: Inside the production workshop for traction motor cores in rail transit, a self-adjusting stamping process is continuously stamping high-permeability silicon steel sheets. First, the silicon steel sheet is placed on the feed table 6 of the equipment. The feed end of the feed table 6 is equipped with a centrally located feed guide 7. This centrally located feed guide 7 consists of two sets of rotating bases 701, which are rotatably connected to the feed table 6. A limiting groove 702 is provided on its upper side, and a limiting pin 703 fits within the limiting groove 702. The limiting pin 703 is fixedly connected to the feed table 6. An adjusting plate 704 is fixedly connected to the rotating base 701, and a lateral pressure roller 705 is rotatably connected to the adjusting plate 704. The adjusting plate 704 has multiple arrayed fixing holes 706, and the roller shaft of the lateral pressure roller 705 is fixedly connected to the fixing holes 706. A traction spring 707 is fixedly connected to the rotating base 701. An adjusting guide plate 708 is fixedly connected to the other end of the traction spring 707. An annular pulley 709 is provided in the middle of the traction spring 707, and the middle of the traction spring 707 passes around the rotating base 701 and the annular pulley 709. A guide rod 16 is fixedly connected to the outside of the adjusting guide plate 708. A side support plate 17 is slidably connected to the guide rod 16. The side support plate 17 is fixedly connected to the feeding table 6. A fixing nut 18 is fixedly threaded to the guide rod 16 on the outside of the side support plate 17. A first spring 19 is provided on the guide rod 16 on the inside of the side support plate 17. A guide groove 20 through which the feeding plate passes is provided on the inside of the adjusting guide plate 708. A sliding roller 21 is provided on the inside of the guide groove 20. By adjusting the cooperation between the guide plate 708 and the side pressure roller 705, the width direction of the silicon steel sheet is precisely positioned and constrained before entering the stamping area, effectively preventing the sheet from shifting laterally during the feeding process and ensuring the accuracy of subsequent stamping.

[0070] The sheet metal is then fed to the stamping table 5. The side of the stamping table 5 is at the same height as the feeding table 6, ensuring a smooth transition of the sheet metal. An adjusting roller frame 8 is provided at the feeding end of the stamping table 5. The adjusting roller frame 8 includes a support shaft 801, on which two sets of symmetrically distributed adjusting sleeves 802 are provided. A fixing bolt 803 connects the adjusting sleeves 802 to the support shaft 801. A connecting plate 804 is rotatably connected inside the adjusting sleeve 802, and a torsion spring 805 is installed between the adjusting sleeve 802 and the connecting plate 804. A feeding pressure roller 9 is rotatably connected to one side of the adjusting roller frame 8, and a limiting pressure roller 10 is rotatably connected to the other side. The feeding pressure roller 9 is located inside the connecting plate 804, and a roller 806 is rotatably connected to the outside of the connecting plate 804. The roller 806 is coaxially placed with the feeding pressure roller 9, the distance between the two rollers 806 is equal to the width of the sheet metal, and the difference in radius between the roller 806 and the feeding pressure roller 9 is equal to the thickness of the sheet metal. When the material plate enters below the adjusting roller frame 8, the feeding pressure roller 9 and the limiting pressure roller 10 apply a pre-tightening force to the material plate under the action of the torsion spring 805, further positioning and pressing the material plate in the longitudinal and vertical directions.

[0071] At the start of the stamping process, the slider 2 inside the stamping frame 1 begins to move downwards. A stamping head 3 is fixedly connected to the bottom of the slider 2. An elastic pressure plate 4 is located below the stamping head 3, with a through slot in the middle for the stamping head 3 to pass through. A support column 22 is fixedly connected to the elastic pressure plate 4, and the support column 22 is slidably connected to the slider 2. A second spring 23 is located on the support column 22 below the slider 2. Before the stamping head 3 contacts the workpiece, the elastic pressure plate 4, under the action of the second spring 23, first contacts and presses the workpiece, pre-pressing and flattening it to prevent warping during stamping. Subsequently, the stamping head 3 passes through the through slot of the elastic pressure plate 4 and stamps the workpiece into shape.

[0072] As the stamping head 3 moves downward, the downward movement of the slider 2 drives the limiting pressure roller 10 to press the material plate downward through the slide plate 12 and the elastic bracket 11. Specifically, the elastic bracket 11 includes a fixed frame 1101, on which a support rod 1102 is fixedly connected. A support beam 1103 is fixedly connected to the side of the stamping frame 1. The support beam 1103 has a through hole for the support rod 1102 to slide. A first baffle 1104 is fixedly connected to the support rod 1102 above the support beam 1103. A second baffle 1105 is fixedly connected to the support rod 1102 between the support beam 1103 and the slide plate 12. A return spring 1106 is provided above the second baffle 1105, and a lifting spring 1107 is provided below the second baffle 1105. The slide plate 12 is fixedly connected to the slider 2, and the slide plate 12 is slidably connected to the middle of the elastic bracket 11. When slider 2 moves downward, slide plate 12 drives elastic support 11 to move downward, thereby pressing down limit roller 10 synchronously and applying additional, strong vertical clamping force to the material plate in front of the stamping area. This linkage clamping mechanism forms a rigid constraint on the material plate feed end at the moment of stamping, effectively suppressing the longitudinal and lateral movement of the material plate under the impact of stamping, solving the problem of unstable material plate positioning in existing equipment, and ensuring the accuracy of stamping step distance and the consistency of punching position.

[0073] In addition, a bellows 13 is fixedly connected to the lower end of the elastic support 11, with the air outlet of the bellows 13 facing the stamping table 5. A high-pressure air duct 14, communicating with the bellows 13, is fixedly connected to the side of the elastic support 11. An adjusting pressure roller 15 is provided at the bottom of the bellows 13, located obliquely above the limiting pressure roller 10. As the elastic support 11 and the limiting pressure roller 10 are pressed down synchronously, the bellows 13 also descends, and its air outlet is brought to the upper part of the stamping area. The high-pressure air duct 14 delivers high-pressure airflow to the bellows 13, and the bellows 13 precisely sprays the high-pressure airflow onto the surface of the material plate in the stamping area. This high-pressure airflow can promptly blow away the tiny iron filings, burrs, and silicon steel coating debris generated during the stamping process, preventing them from remaining on the surface of the material plate and avoiding the iron filings being pressed into the silicon steel sheet in subsequent stamping, causing defects such as scratches and dents. Compared with existing equipment that lacks timely cleaning methods, this equipment significantly improves the surface quality and insulation performance of the iron core laminations through real-time cleaning with high-pressure airflow.

[0074] After stamping, the slider 2 returns to its original position, and the elastic support 11 also rises upward under the combined action of the return spring 1106 and the lifting spring 1107. The limiting pressure roller 10 and the air box 13 then rise, and the elastic pressure plate 4 also returns to its original position with the assistance of the second spring 23. The material plate is then pushed forward by the feeding mechanism to the next stamping station. Throughout the stamping cycle, the coordinated action of the central feeding guide 7, the adjusting roller frame 8, the elastic pressure plate 4, and the limiting pressure roller 10 ensures that the material plate remains precisely positioned and pressed before and during stamping, effectively solving the problem of material plate movement. Simultaneously, the integration of the air box 13 and the high-pressure air duct 14 enables immediate cleaning of stamping chips, avoiding damage to the surface of the material plate. This integrated self-adjusting stamping equipment, through the close coordination of its various technical features, significantly improves the production quality and efficiency of railway traction motor core laminations.

[0075] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-adjusting stamping process device for the iron core of a traction motor in rail transit, characterized in that: Includes a stamping frame (1), a slider (2) is slidably connected inside the stamping frame (1), a stamping head (3) is fixedly connected to the bottom of the slider (2), an elastic pressure plate (4) is provided below the stamping head (3), a stamping table (5) is fitted below the elastic pressure plate (4), a feeding platform (6) of the same height is provided on the side of the stamping table (5), a central feeding guide (7) is provided at the feeding end of the feeding platform (6), an adjusting roller frame (8) is provided at the discharge end of the feeding platform (6), a feeding pressure roller (9) is rotatably connected to one side of the adjusting roller frame (8), and a limiting pressure roller (10) is rotatably connected to the other side of the adjusting roller frame (8). An elastic support (11) is provided above the pressure roller (10). The upper end of the elastic support (11) is slidably connected to the stamping frame (1). A sliding plate (12) is slidably connected to the middle of the elastic support (11). The sliding plate (12) is fixedly connected to the slider. A bellows (13) is fixedly connected to the lower end of the elastic support (11). The air outlet of the bellows (13) faces the stamping table (5). A high-pressure air pipe (14) connected to the bellows (13) is fixedly connected to the side of the elastic support (11). During the stamping process, the downward movement of the slider drives the limiting pressure roller (10) to press the sheet material downward through the sliding plate (12) and the elastic support (11).

2. The self-adjusting stamping equipment for the iron core of a rail transit traction motor according to claim 1, characterized in that: The elastic support (11) includes a fixed frame (1101), a support rod (1102) is fixedly connected to the fixed frame (1101), a support beam (1103) is fixedly connected to the side of the stamping frame (1), the support beam (1103) is provided with a through hole for the support rod (1102) to slide, a first baffle (1104) is fixedly connected to the support rod (1102) above the support beam (1103), a second baffle (1105) is fixedly connected to the support rod (1102) between the support beam (1103) and the slide plate (12), a return spring (1106) is provided above the second baffle (1105), and a lifting spring (1107) is provided below the second baffle (1105).

3. The self-adjusting stamping equipment for the iron core of a rail transit traction motor according to claim 2, characterized in that: The bottom of the air box (13) is provided with an adjusting pressure roller (15), which is located diagonally above the limiting pressure roller (10).

4. The self-adjusting stamping equipment for the iron core of a rail transit traction motor according to claim 1, characterized in that: The adjusting roller frame (8) includes a support shaft (801), the support shaft (801) is provided with two sets of symmetrically distributed adjusting sleeves (802), the adjusting sleeves (802) are connected to the support shaft (801) by fixing bolts (803), a connecting plate (804) is rotatably connected inside the adjusting sleeves (802), and a torsion spring (805) is installed between the adjusting sleeves (802) and the connecting plate (804).

5. The self-adjusting stamping equipment for the iron core of a rail transit traction motor according to claim 4, characterized in that: The feeding roller (9) is located inside the connecting plate (804), and a roller (806) is rotatably connected to the outside of the connecting plate (804). The roller (806) is placed coaxially with the feeding roller (9), and the distance between the two rollers (806) is equal to the width of the material plate. The radius difference between the roller (806) and the feeding roller (9) is equal to the thickness of the material plate.

6. The self-adjusting stamping equipment for the iron core of a rail transit traction motor according to claim 1, characterized in that: The central feed guide (7) includes two sets of rotating bases (701). The rotating bases (701) are rotatably connected to the feed table (6). The upper side of the rotating bases (701) is provided with a limiting groove (702). The limiting groove (702) is fitted with a limiting pin (703). The limiting pin (703) is fixedly connected to the feed table (6). An adjusting plate (704) is fixedly connected to the rotating bases (701). A lateral pressure roller (705) is rotatably connected to the adjusting plate (704).

7. A self-adjusting stamping processing device for the iron core of a rail transit traction motor according to claim 6, characterized in that: The adjusting plate (704) is provided with a plurality of arrayed fixing holes (706), and the roller shaft of the lateral pressure roller is fixedly connected to the fixing holes (706).

8. A self-adjusting stamping processing device for the iron core of a rail transit traction motor according to claim 6, characterized in that: A traction spring (707) is fixedly connected to the slewing base (701), and an adjusting guide plate (708) is fixedly connected to the other end of the traction spring (707). An annular pulley (709) is provided in the middle of the traction spring (707), and the middle of the traction spring (707) passes around the slewing base (701) and the annular pulley (709).

9. A self-adjusting stamping processing device for the iron core of a rail transit traction motor according to claim 8, characterized in that: A guide rod (16) is fixedly connected to the outside of the adjusting guide plate (708). The guide rod (16) is slidably connected to a side support plate (17). The side support plate (17) is fixedly connected to the feeding table (6). A fixing nut (18) is fixedly threaded onto the guide rod (16) on the outside of the side support plate (17). A first spring (19) is provided on the guide rod (16) on the inside of the side support plate (17). A guide groove (20) through which the feeding plate passes is provided on the inside of the adjusting guide plate (708). A sliding roller (21) is provided on the inside of the guide groove (20).

10. A self-adjusting stamping processing device for the iron core of a rail transit traction motor according to claim 1, characterized in that: The elastic pressure plate (4) has a through groove in the middle for the punch head (3) to pass through. A support column (22) is fixedly connected to the elastic pressure plate (4). The support column (22) is slidably connected to the slider. A second spring (23) is provided on the support column (22) below the slider.

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