A bending center pressure knife length fine adjustment mechanism and operation method suitable for heavy loads

Abstract

This invention discloses a fine-tuning mechanism and operating method for the length of the upper pressure cutter in a bending center suitable for heavy-duty applications. It relates to the field of bending centers and effectively solves the problems of long-term operation affecting bending accuracy, low cutter alignment accuracy, and limitations in heavy-duty applications. The technical solution includes: modular installation of the vertical and side support mechanisms, facilitating adjustment of the support state according to the status of the movable upper pressure cutter, solving the problem of increased gaps due to sliding wear, and reducing production costs; the vertical and side support mechanisms increase the vertical and lateral load strength of the movable upper pressure cutter, reducing the load on the linear slider and greatly improving its heavy-duty processing capacity; the stepless adjustment mechanism allows for more precise fine-tuning of the cutter alignment length of the movable upper pressure cutter, facilitating more accurate workpiece alignment and bending, and achieving a more refined combination of cutter alignment length adjustments.

Description

Technical Field

[0001] This invention relates to the field of bending center technology, and in particular to a bending center pressure blade length fine adjustment mechanism and operating method suitable for heavy loads. Background Technology

[0002] In existing bending center upper pressure cutters, during automatic tool setting, the upper pressure cutter needs to move back and forth. Therefore, it is generally slidably mounted on the die base or mounted on the die base via a linear guide slider mechanism to ensure the upper pressure cutter can move left and right. However, if the upper pressure cutter is slidably mounted on the die base, the requirements for machining accuracy are high, the cost is high, and with the longer the service life, the sliding surface will wear, resulting in a larger sliding clearance, which will affect the bending accuracy.

[0003] If the upper pressure cutter is mounted on the die base using a linear guide slider mechanism, the machining requirements are relatively lower and installation is more convenient due to the use of a standard linear slider. However, compared to a sliding upper pressure cutter mounting method, this structure has limitations in heavy-duty bending applications because the force is entirely borne by the linear slider, and the load-bearing capacity of the linear slider is less than that of a sliding upper pressure cutter. Furthermore, currently, in automatic tool arrangement for bending center upper pressure cutters, the tool length is typically arranged in increments of 10mm or 5mm. Increments of less than 10mm or 5mm are not achievable, resulting in insufficient precision in tool length arrangement.

[0004] In view of the above, the present invention provides a bending center pressure knife length fine adjustment mechanism and operation method suitable for heavy loads to solve the above problems. Summary of the Invention

[0005] In view of the above situation, the present invention provides a fine adjustment mechanism and operation method for the pressure knife length of a bending center suitable for heavy loads. This device solves the problem of increased gap caused by sliding wear, reduces production costs, improves the heavy load processing capacity of the bending center, and realizes a more precise adjustment combination of the blade length.

[0006] A mechanism for fine-tuning the length of the pressure cutter at the bending center, suitable for heavy-duty applications, and its operation method, including: The pressure plate has linear guide rails fixedly installed on both sides of its lower surface, and linear sliders are slidably connected to the outside of the linear guide rails. A fixed pressure knife is fixedly installed in the middle of the bottom end of the pressure plate, and an inner upper pressure knife is provided on both sides of the plate. The movable upper pressure knife is fixedly installed at the bottom of the linear slider, and there are several of them. The several movable upper pressure knives are divided into two groups, and the two groups of movable upper pressure knives are slidably connected to two groups of linear guides through the linear slider. A vertical support mechanism is provided between the top of the movable upper pressure knife and the bottom of the pressure plate; A side support mechanism is provided at the top of the movable upper pressure knife side and connected to the bottom of the pressure plate; A stepless adjustment mechanism is located on the top of the movable upper pressure knife on the side away from the side support mechanism; A pressure knife connecting mechanism is located on the top of the side of the movable upper pressure knife, and adjacent upper pressure knives can be connected to each other through the pressure knife connecting mechanism; The pressing and clamping mechanism is set on the side of the movable upper pressing knife, and the pressing and clamping mechanism is set on several movable upper pressing knives far from the center on the two linear guide rails. The first adjustment mechanism is located in the middle of the side of the pressure plate and its movable end is connected to the movable upper pressure knife near the middle. The second adjustment mechanism is located at the end of the side of the pressure plate and its movable end is connected to the movable upper pressure knife away from the center. The vertical support mechanism includes an upper fixed slide plate, a lower slide plate, guide screws, an inclined fixed plate, a slide plate baffle, and a first set screw. The upper fixed slide plate is fixedly connected to the bottom of the pressure plate. The inclined fixed plate is fixedly connected to the top of the movable upper pressure knife and has slide plate baffles fixedly connected to both sides. The top of the sides of the two slide plate baffles are threaded with a first set screw that can abut against the lower slide plate. The lower slide plate abuts between the upper fixed slide plate and the inclined fixed plate and has guide screws threaded to both sides. The side support mechanism includes a rear fixed slide plate, a rear slide plate pressure block, a rear slide plate back plate, a second set screw, and fastening screws. The rear fixed slide plate is fixedly connected to the side of the bottom of the pressure plate. The bottom of the rear slide plate back plate is fixedly connected to the top of the side of the movable upper pressure knife by bolts. The rear slide plate pressure block is fixedly installed between the top of the rear slide plate back plate and the rear fixed slide plate by fastening screws. The second set screw is threaded through the side of the rear slide plate back plate and abuts against the rear slide plate pressure block. The top of the inclined fixing plate is inclined and tilts from one side of one sliding plate to the other side of the sliding plate. The lower surface of the lower sliding plate has the same tilt angle as the top of the inclined fixing plate and fits against the upper surface of the inclined fixing plate. Both sides of the upper surface of the inclined fixing plate are provided with waist-shaped grooves that are adapted to the guide screws, and the two guide screws are respectively inserted into the two waist-shaped grooves. The stepless adjustment mechanism includes a cylinder seat plate, a first cylinder, and a top cap. The cylinder seat plate is fixedly connected to the top of the movable upper pressure knife side, and the cylinder body of the first cylinder is horizontally fixedly installed on the cylinder seat plate. The top cap is rotatably connected to the end of the piston rod of the first cylinder by a thread. The number of stepless adjustment mechanisms is several, and each of the multiple movable upper pressure knives in the two sets of movable upper pressure knives is provided with a stepless adjustment mechanism. The top cap at the end of the piston rod of each first cylinder abuts against the cylinder seat plate on the adjacent movable upper pressure knife.

[0007] Preferably, the pressing knife connecting mechanism includes a second cylinder, a pin, a connecting rod, and a socket. The cylinder body of the second cylinder is fixedly installed on the top of the movable upper pressing knife near the first cylinder, and its piston rod passes through the interior of the movable upper pressing knife. The pin is connected to the end of the piston rod of the first cylinder. The connecting rod is fixedly connected to the movable upper pressing knife on the side close to its adjacent movable upper pressing knife. The socket is opened at the end of the connecting rod away from the movable upper pressing knife.

[0008] Preferably, the movable upper pressure knife has a slot on the side away from the connecting rod that is horizontally corresponding to the connecting rod. Each connecting rod on the side of the movable upper pressure knife can be inserted into the slot on the side of the adjacent movable upper pressure knife, and the pin is inserted laterally into the inside of the slot and can be inserted into the insertion hole of the end of the connecting rod inserted into the slot.

[0009] Preferably, the pressing and clamping mechanism includes a third cylinder, a fisheye connector, a top plate, and a fixing block. The bottom of the third cylinder body is rotatably connected to the bottom of the movable upper pressing knife, and the fisheye connector is fixedly connected to the top of the piston rod of the third cylinder. The end of the top plate is rotatably connected to the middle of the movable upper pressing knife, and the middle part is rotatably connected to the fisheye connector. The fixing block is fixedly connected to the side of another adjacent movable upper pressing knife, and the top plate can abut against the fixing block on the side of another adjacent movable upper pressing knife.

[0010] Preferably, both inner upper pressure knives are slidably connected to the two linear guide rails on one side near the middle of the pressure plate via linear sliders and correspond to the movable upper pressure knives on both sides. The first adjustment mechanism includes a first reduction motor, a first ball screw, a first screw slide block, and a first slide rail. The first reduction motor and the first slide rail are fixedly installed on the side of the pressure plate, and the first ball screw is connected to the output end of the first reduction motor via a spline. The first screw slide block is drivenly connected to the outside of the first ball screw and slidably connected to the outside of the first slide rail. The bottom end of the first screw slide block is fixedly connected to the corresponding inner upper pressure knives below it.

[0011] Preferably, the second adjustment mechanism includes a second geared motor, a second ball screw, a second screw slide, and a second slide rail. The second geared motor is fixedly installed at the bottom of the side end face of the pressure plate, and the second ball screw is connected to the output end of the second geared motor via a spline. The second slide rail is fixedly connected to the bottom side of the pressure plate near the second geared motor and is parallel to the second ball screw. The second screw slide is drivenly connected to the outside of the second ball screw and slidably connected to the outside of the second slide rail. The bottom end of the second screw slide is fixedly connected to the movable upper pressure knife below it, away from the fixed pressure knife. There are two of each of the first and second adjustment mechanisms, and both the first and second adjustment mechanisms are symmetrically arranged about the vertical center line of the pressure plate as the axis of symmetry.

[0012] An operating method for a bending center pressure knife length fine-tuning mechanism suitable for heavy loads includes the following steps: S1. In the initial state, all the movable upper pressure knives on both sides are pressed against each other and against the inner upper pressure knives and fixed pressure knives in the middle. Multiple movable upper pressure knives on the same side are connected to each other through pressure knives connecting mechanisms. All stepless adjustment mechanisms are in the retracted state. When it is necessary to adjust the length of the knives in the pressure knives section, the number of movable upper pressure knives that can fully participate in bending can be selected according to the width of the workpiece to be bent. The pressure knives connecting mechanisms on each movable upper pressure knives corresponding to the appropriate length position that matches the width of the workpiece to be bent are disengaged from the adjacent movable upper pressure knives. Then, the second adjustment mechanism drives the other movable upper pressure knives connected to it that do not participate in bending to move away from the fixed pressure knives. This pulls the movable upper pressure knives that do not need to participate in bending the sheet metal to the outside, while the multiple movable upper pressure knives that participate in bending on the inside and the inner upper pressure knives are in a relatively movable state. S2. After adjustment, if the end of the movable upper pressure knife participating in bending and corresponding to the edge of the workpiece cannot be fully aligned with the edge of the workpiece, the distance between the multiple movable upper pressure knives participating in bending can be finely adjusted by the stepless adjustment mechanism. One or more stepless adjustment mechanisms can be controlled to adjust the range of adjustment as needed, so that the length of the pressure knife in bending can be fully aligned with the width of the workpiece. Each stepless adjustment mechanism can be adjusted independently. The distance between the inner upper pressure knife and each movable upper pressure knife and the fixed pressure knife can be adjusted by the first adjustment mechanism, so as to facilitate more precise adjustment of the distance between the movable upper pressure knives participating in bending on both sides. S3. When the movable upper pressure knife participating in the bending presses the workpiece, the external bending mechanism bends the workpiece. The movable upper pressure knife will be subjected to vertical and oblique loads. The lower slide plate in the vertical support mechanism can press against the upper fixed slide plate and the inclined fixed plate, thus providing lower auxiliary support for the movable upper pressure knife. The rear slide plate pressure block in the side support mechanism can press against the rear fixed slide plate and the rear slide plate back plate, providing lateral auxiliary support for the movable upper pressure knife, improving the vertical and lateral load strength of the movable upper pressure knife, making it suitable for heavy-duty bending conditions. Moreover, the vertical support mechanism and the side support mechanism can be manually adjusted according to the state of the movable upper pressure knife after a long period of operation, so that it always provides stable and firm support for the movable upper pressure knife. S4. After bending and removing the workpiece, control each stepless adjustment mechanism to retract to its initial state. Then, lift the clamping mechanism on the movable upper pressure knife closest to the movable upper pressure knife involved in bending among the multiple movable upper pressure knives that are not involved in bending. Next, operate the second adjustment mechanism on both sides to move the multiple movable upper pressure knives that are not involved in bending towards the center. The lifted clamping mechanism will reduce the gap between the movable upper pressure knives involved in bending to zero and move them all towards the center. After all the movable upper pressure knives involved in bending are clamped together, retract the clamping mechanism and then use the second adjustment mechanism to move the movable upper pressure knives on both sides towards the center until all the movable upper pressure knives, the inner upper pressure knife, and the fixed pressure knife are clamped together, thus achieving the retraction of the movable upper pressure knives.

[0013] The beneficial effects of the above technical solution are as follows: This heavy-duty bending center upper pressure knife length fine-tuning mechanism, through modular installation of vertical and side support mechanisms, allows for manual adjustment of its support state. This facilitates adjustment based on the status of the movable upper pressure knife, solving the problem of increased gaps caused by sliding wear and reducing production costs. Furthermore, the vertical and side support mechanisms increase the vertical and lateral load strength of the movable upper pressure knife, reducing the load on the linear slider and significantly improving its heavy-duty processing capacity. The stepless adjustment mechanism allows for more precise fine-tuning of the knife length of the movable upper pressure knife, facilitating more accurate workpiece alignment and bending, and enabling more refined combinations of knife length adjustments. The pressure knife clamping mechanism can return the fine-tuning gap of the movable upper pressure knife to zero without interfering with the bending edge of the sheet metal, making it more convenient to use during actual bending. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the installation state of the side support mechanism of the present invention; Figure 3 This is a front view schematic diagram of the present invention; Figure 4 This is a side view of the present invention; Figure 5 This is a schematic diagram of the bending state of the workpiece according to the present invention; Figure 6 This is a schematic diagram showing the connection state between the movable upper pressure knife and the linear guide rail of the present invention; Figure 7 This is a schematic diagram of the vertical support mechanism and the side support mechanism of the present invention; Figure 8 This is a schematic diagram showing the vertical support mechanism and the side support mechanism of the present invention in their disassembled state; Figure 9 This is a schematic diagram showing the installation state of the linear guide rail and the upper fixed sliding plate of the present invention; Figure 10 This is a schematic diagram of the connecting rod of the present invention; Figure 11 This is a schematic diagram of the connection state of the pressure knife connecting mechanism of the present invention; Figure 12 This is a schematic diagram of the connection state of the auxiliary support mechanism of the present invention; Figure 13 This is a schematic diagram of the disassembled state of the auxiliary support mechanism of the present invention; Figure 14 This is a cross-sectional view of the auxiliary support mechanism of the present invention.

[0015] In the diagram: 1. Pressure plate; 2. Linear guide rail; 3. Linear slider; 4. Movable upper pressure knife; 5. Vertical support mechanism; 501. Upper fixed slide plate; 502. Lower slide plate; 503. Guide screw; 504. Inclined fixed plate; 505. Slide plate baffle; 506. First set screw; 6. Side support mechanism; 601. Rear fixed slide plate; 602. Rear slide plate pressure block; 603. Rear slide plate back plate; 604. Second set screw; 605. Fastening screw; 7. Stepless adjustment mechanism; 701. Cylinder seat plate; 702. First cylinder; 703. Top cap; 8. Pressure knife connecting mechanism; 801. Second cylinder; 802. Pin; 803. Connecting rod; 804. 9. Insertion hole; 9. Pressure knife clamping mechanism; 901. Third cylinder; 902. Fish eye connector; 903. Top plate; 904. Fixing block; 10. First adjustment mechanism; 1001. First geared motor; 1002. First ball screw; 1003. First screw slide; 1004. First slide rail; 11. Second adjustment mechanism; 1101. Second geared motor; 1102. Second ball screw; 1103. Second screw slide; 1104. Second slide rail; 12. Slot; 13. Fixed pressure knife; 14. Inner upper pressure knife; 15. Auxiliary support mechanism; 1501. Lower top block; 1502. Limit guide screw; 1503. Third top screw. Detailed Implementation

[0016] The foregoing and other technical contents, features and effects of the present invention are described in conjunction with the appendix below. Figures 1 to 14 As will be clearly shown in the detailed description of the embodiments, all structural contents mentioned in the following embodiments are based on the accompanying drawings.

[0017] This embodiment provides a fine-tuning mechanism and operation method for the length of the pressure cutter at the bending center suitable for heavy loads, as shown in the attached figure. Figure 1 As shown, including; The pressure plate 1 has linear guide rails 2 fixedly installed on both sides of its lower surface, and linear sliders 3 are slidably connected to the outside of the linear guide rails 2; there are four linear guide rails 2, and the four linear guide rails 2 are evenly divided into two groups. The two groups of linear guide rails 2 are fixedly installed on both sides of the lower surface of the pressure plate 1, and the two linear guide rails 2 in each group are parallel to each other. The fixed pressure knife 13 is fixedly installed in the middle of the bottom end of the pressure plate 1, and an inner upper pressure knife 14 is provided on both sides of it; the two inner upper pressure knives 14 are slidably connected to the side of the two sets of linear guide rails 2 near the middle of the pressure plate 1 through linear sliders 3 and correspond to the movable upper pressure knives 4 on both sides; the two inner upper pressure knives 14 are respectively attached to the two sides of the fixed pressure knife 13. The movable upper pressure knife 4 is fixedly installed at the bottom of the linear slider 3, and there are several of them. The several movable upper pressure knives 4 are evenly divided into two groups, and the two groups of movable upper pressure knives 4 are slidably connected to the two groups of linear guide rails 2 through the linear sliders 3 respectively. The top of the movable upper pressure knife 4 is fixedly connected to two linear sliders 3, and the two linear sliders 3 are slidably connected to the outside of the two linear guide rails 2 on the same side, which can provide more stable support for the movable upper pressure knife 4.

[0018] The vertical support mechanism 5 is disposed between the top of the movable upper pressure knife 4 and the bottom of the pressure plate 1; specifically, as shown in the attached diagram. Figure 7-9As shown, the vertical support mechanism 5 includes an upper fixed slide plate 501, a lower slide plate 502, a guide screw 503, an inclined fixing plate 504, a slide plate baffle 505, and a first set screw 506. The upper fixed slide plate 501 is fixedly connected to the bottom of the pressure plate 1, which serves to press the lower slide plate 502 and ensure that the two slide relative to each other. The inclined fixing plate 504 is fixedly connected to the top of the movable upper pressure knife 4, and slide plates baffle 505 are fixedly connected to both sides of it. The top of the sides of the two slide plates baffle 505 are threaded with the first set screw 506, which can press against the lower slide plate 502. The lower slide plate 502 abuts between the upper fixed slide plate 501 and the inclined fixing plate 504, and guide screws 503 are threaded to both sides of it. The top of the inclined fixing plate 504 is inclined and tilted from one side of one slide plate baffle 505 to the other side of the slide plate baffle 505. The lower surface of the sliding plate 502 is at the same angle as the top of the inclined plate 504 and fits against the upper surface of the inclined plate 504. Both sides of the upper surface of the inclined plate 504 are provided with waist-shaped grooves that are compatible with the guide screws 503, and the two guide screws 503 are respectively inserted into the two waist-shaped grooves. The position of the sliding plate 502 can be adjusted by rotating the two first set screws 506. When the sliding plate 502 moves laterally on the inclined plate 504, its vertical height can be adjusted accordingly. The guide screws 503 can only move within the waist-shaped grooves, which play a guiding and limiting role for the sliding plate 502. Therefore, by adjusting the first set screws 506 on both sides, the top of the sliding plate 502 can be brought into contact with the upper fixed plate 501 and kept fixed, so that the sliding plate 502 can play a vertical auxiliary support role for the movable upper pressure knife 4 and improve the vertical bearing capacity of the movable upper pressure knife 4.

[0019] The side support mechanism 6 is located at the top of the side of the movable upper pressure knife 4 and is connected to the bottom of the pressure plate 1; specifically, as shown in the attached diagram. Figure 7-9 As shown, the side support mechanism 6 includes a rear fixed slide plate 601, a rear slide plate pressure block 602, a rear slide plate back plate 603, a second set screw 604, and a fastening screw 605. The rear fixed slide plate 601 is fixedly connected to the side of the bottom of the pressure plate 1. The bottom of the rear slide plate back plate 603 is fixedly connected to the top of the side of the movable upper pressure knife 4 by bolts. The rear slide plate pressure block 602 is fixedly installed between the top of the rear slide plate back plate 603 and the rear fixed slide plate 601 by fastening screws 605. The second set screw 604 is threaded through the rear slide plate. The back plate 603 abuts against the side of the rear slide plate pressure block 602; the rear slide plate pressure block 602 is pressed between the rear fixed slide plate 601 and the rear slide plate back plate 603, which can form a support pad between the two. When the movable upper pressure knife 4 is subjected to the lateral load applied by the bent workpiece, the rear slide plate pressure block 602 can play an auxiliary support role in the lateral direction of the movable upper pressure knife 4, improve the lateral bearing capacity of the movable upper pressure knife 4, and cooperate with the vertical support mechanism 5 to make the bending equipment more suitable for heavy-duty bending scenarios. Furthermore, there are three second set screws 604 and two fastening screws 605. The three second set screws 604 are threaded at equal intervals through the top of the side of the rear slide plate back plate 603 and abut against the rear slide plate pressure block 602. By adjusting the second set screws 604, the contact state between the rear slide plate pressure block 602 and the rear fixed slide plate 601 can be adjusted, so that the state of the rear slide plate pressure block 602 can be adjusted according to the different models of bending equipment, so that the rear slide plate pressure block 602 can always abut against the rear fixed slide plate 601, ensuring good lateral support between the two. The two fastening screws 605 pass through the rear slide plate back plate 603 and are threaded inside the rear slide plate pressure block 602. By rotating the fastening screws 605, the contact surface between the rear slide plate pressure block 602 and the second set screws 604 can be tightly tightened, ensuring that each structure has stable support. All movable upper pressure knives 4 and inner upper pressure knives 14 are equipped with vertical support mechanisms 5 and side support mechanisms 6 at their top, which provide stable vertical and lateral support for the movable upper pressure knives 4 and inner upper pressure knives 14, thereby improving the overall load-bearing strength. Meanwhile, after prolonged operation at the bending center, the existing one-piece molding pressure knife part will experience wear on the sliding surface due to long-term use, resulting in increased gaps and reduced support strength for the pressure knife, affecting bending accuracy. In contrast, this invention employs a modular adjustable vertical support mechanism 5 and a side support mechanism 6, which allows manual adjustment of the vertical and lateral sliding contact parts after prolonged operation at the bending center. This ensures that the lower sliding plate 502 and the rear sliding plate pressure block 602 always fit against the upper fixed sliding plate 501 and the rear fixed sliding plate 601, thereby guaranteeing that the movable upper pressure knife 4 always has good vertical and lateral support force, ensuring that the bending center always maintains good bending accuracy.

[0020] The stepless adjustment mechanism 7 is located on the top of the movable upper pressure knife 4 on the side away from the side support mechanism 6; specifically, as shown in the attached diagram. Figure 1 , 3 As shown in Figure 5, the stepless adjustment mechanism 7 includes a cylinder seat plate 701, a first cylinder 702, and a top cap 703. The cylinder seat plate 701 is fixedly connected to the top of the side of the movable upper pressure knife 4, and the cylinder body of the first cylinder 702 is horizontally fixedly installed on the cylinder seat plate 701. The top cap 703 is rotatably connected to the end of the piston rod of the first cylinder 702 by a thread. The top cap 703 can rotate at the end of the piston rod of the first cylinder 702, so that the length of the piston rod of the first cylinder 702 can be finely adjusted by rotating the top cap 703. Furthermore, there are several stepless adjustment mechanisms 7, and each of the multiple movable upper pressing blades 4 in the two sets of movable upper pressing blades 4 is equipped with a stepless adjustment mechanism 7. The top cap 703 at the end of the piston rod of each first cylinder 702 abuts against the cylinder seat plate 701 on the adjacent movable upper pressing blade 4. When the piston rod of the first cylinder 702 extends, the top cap 703 can push against the cylinder seat plate 701 on the adjacent movable upper pressing blade 4, thereby leaving a small gap between the two adjacent movable upper pressing blades 4. By adjusting the screw-in position of the top cap 703, the ejection gap between the piston rod of the first cylinder 702 and the adjacent movable upper pressing blade 4 after the piston rod extends can be adjusted, thereby realizing the stepless adjustment of the blade length of the movable upper pressing blade 4. Since multiple movable upper pressing blades 4 are equipped with stepless adjustment mechanisms 7, suitable gaps can be ejected simultaneously between multiple movable upper pressing blades 4 to achieve more and more precise combinations of blade lengths.

[0021] The pressure knife connecting mechanism 8 is located on the top of the side of the movable upper pressure knife 4, and adjacent movable upper pressure knives 4 can be connected to each other through the pressure knife connecting mechanism 8; specifically, as shown in the attached figure. Figure 10 and 11 As shown, the pressure knife connecting mechanism 8 includes a second cylinder 801, a pin 802, a connecting rod 803, and a socket 804. The cylinder body of the second cylinder 801 is fixedly installed on the top of the movable upper pressure knife 4 near the first cylinder 702, and its piston rod passes through the interior of the movable upper pressure knife 4. The pin 802 is connected to the end of the piston rod of the first cylinder 702 by a spline. The connecting rod 803 is fixedly connected to the movable upper pressure knife 4 on the side close to its adjacent movable upper pressure knife 4. The socket 804 is opened at the end of the connecting rod 803 away from the movable upper pressure knife 4. Furthermore, a slot 12 corresponding horizontally to the connecting rod 803 is provided on the side of the movable upper pressure knife 4 away from the connecting rod 803. The connecting rod 803 on the side of each movable upper pressure knife 4 can be inserted into the slot 12 on the side of the adjacent movable upper pressure knife 4, and the pin 802 is horizontally inserted into the inside of the slot 12 and can be inserted into the insertion hole 804 at the end of the connecting rod 803 inserted into the slot 12. This can connect two adjacent movable upper pressure knives 4 into a whole and the two will not move relative to each other. When it is necessary to bend a workpiece of a certain length, the pressure knife connecting mechanism 8 on each movable upper pressure knife 4 corresponding to the appropriate length position that matches the width of the workpiece to be bent is disengaged from the adjacent movable upper pressure knife 4. At the same time, the multiple movable upper pressure knives participating in the bending are also disengaged. The pressure knife connecting mechanism 8 on the upper part 4 is disconnected, allowing all the movable upper pressure knives 4 involved in bending to move relative to each other, facilitating fine adjustment of the knife length via the stepless adjustment mechanism 7; while the multiple movable upper pressure knives 4 not involved in bending are still connected to each other via the pressure knife connecting mechanism 8. Therefore, when the second adjustment mechanism 11 drives the movable upper pressure knife 4 connected to its movable end to move outward, it can simultaneously drive the multiple movable upper pressure knives 4 not involved in bending connected to each other via the pressure knife connecting mechanism 8 to move outward synchronously, ensuring that the movable upper pressure knives 4 not involved in bending can all move to a position that does not affect bending; each movable upper pressure knife 4 is provided with an individually controllable pressure knife connecting mechanism 8, which can facilitate disconnection of the corresponding movable upper pressure knife according to the length of the workpiece being bent.

[0022] The pressing and clamping mechanism 9 is located on the side of the movable upper pressing knife 4, and is also provided on several movable upper pressing knives 4 on the two linear guide rails 2 away from the center; specifically, as shown in the attached figure. Figure 1 and 3As shown, the pressing knife clamping mechanism 9 includes a third cylinder 901, a fisheye connector 902, a top plate 903, and a fixing block 904. The bottom of the cylinder body of the third cylinder 901 is rotatably connected to the bottom of the movable upper pressing knife 4, and the fisheye connector 902 is fixedly connected to the top of the piston rod of the third cylinder 901. The end of the top plate 903 is rotatably connected to the middle of the movable upper pressing knife 4, and the middle part is rotatably connected to the fisheye connector 902. The fixing block 904 is fixedly connected to the side of another adjacent movable upper pressing knife 4, and the top plate 903 can abut against the fixing block 904 on the side of another adjacent movable upper pressing knife 4. When the top plate 903 is pushed to a horizontal state by the third cylinder 901, it can be horizontally aligned with the fixing block 904 on the adjacent movable upper pressing knife 4. The purpose of this mechanism is to facilitate the retraction of each movable upper pressing knife 4 to the initial mutually abutting state, eliminating the gap between the movable upper pressing knives 4. When the workpiece bending is completed and it is necessary to retract each movable upper pressing knife 4 to the initial mutually abutting state, the mechanism is designed to facilitate the retraction of each movable upper pressing knife 4 to the initial mutually abutting state. In the initial state, the piston rods of each stepless adjustment mechanism 7 can be retracted to the initial state. Then, the piston rod of the third cylinder 901 on the movable upper pressure knife 4 that is close to the movable upper pressure knife 4 that is involved in bending is pushed out. Through the fisheye joint 902, the top plate 903 is rotated to a horizontal state. Then, the second adjustment mechanism 11 on both sides is operated, which drives the multiple movable upper pressure knives 4 that are not involved in bending to move towards the center. The raised top plate 903 will make the gap between the movable upper pressure knives 4 that were originally involved in bending zero and move them all towards the center. The setting of the pressure knife clamping mechanism 9 can push the inner movable upper pressure knife 4 that is involved in bending inward by pushing the fixed block 904 with the top plate 903, instead of directly pushing the inner movable upper pressure knife with the outer movable upper pressure knife 4 that is not involved in bending. This avoids the bending edge of the workpiece from interfering with the movement of the outer movable upper pressure knife 4 that is not involved in bending. After all the movable upper pressure knives 4 involved in bending are pressed together, the bending edge at the top of the workpiece can be prevented from creating vertical obstruction to the movable upper pressure knives 4. When it is necessary to retract all the movable upper pressure knives 4 to the initial state, the piston rod of the third cylinder 901 below the horizontal top plate 903 is controlled to retract, so that the top plate 903 returns to the initial state. Then, the movable upper pressure knives 4 on both sides are driven by the second adjustment mechanism 11 to continue to move towards the center until all the movable upper pressure knives 4, the inner upper pressure knives 14, and the fixed pressure knives 13 are pressed together, thereby realizing the retraction of the movable upper pressure knives 4.

[0023] The first adjusting mechanism 10 is located in the middle of the side of the pressure plate 1, and its movable end is connected to the movable upper pressure knife 4 near the middle; specifically, as shown in the attached figure. Figure 1 and 3As shown, the first adjusting mechanism 10 includes a first geared motor 1001, a first ball screw 1002, a first screw slide 1003, and a first slide rail 1004. The first geared motor 1001 and the first slide rail 1004 are both fixedly mounted on the side of the pressure plate 1. The first ball screw 1002 is connected to the output end of the first geared motor 1001 via a spline. The first screw slide 1003 is drivenly connected to the outside of the first ball screw 1002 and slidably connected to the outside of the first slide rail 1004. The first slide rail 1004 can adjust the first... The lead screw slide 1003 serves as a guide and limiter, ensuring that it can only move laterally back and forth along the direction of the first slide rail 1004; the bottom end of the first lead screw slide 1003 is fixedly connected to the corresponding inner upper pressure knife 14 below it; the operation of the first reduction motor 1001 drives the first ball screw 1002 to rotate, which can drive the first lead screw slide 1003 outside it to move laterally, thereby driving the inner upper pressure knife 14 connected to the first lead screw slide 1003 to move laterally, which facilitates the adjustment of the distance between the inner upper pressure knife 14 and the fixed pressure knife 13; The second adjustment mechanism 11 is located at the end of the side of the pressure plate 1, and its movable end is connected to the movable upper pressure knife 4 away from the center. The second adjustment mechanism 11 includes a second reduction motor 1101, a second ball screw 1102, a second screw slide 1103, and a second slide rail 1104. The second reduction motor 1101 is fixedly installed at the bottom of the side end face of the pressure plate 1, and the second ball screw 1102 is connected to the output end of the second reduction motor 1101 via a spline. The second slide rail 1104 is fixedly connected to the bottom side of the pressure plate 1 near the second reduction motor 1101 and is parallel to the second ball screw 1102. The second screw slide 1103... 03 is connected to the outside of the second ball screw 1102 and slidably connected to the outside of the second slide rail 1104. The second slide rail 1104 can guide and limit the second screw slide 1103, ensuring that the second screw slide 1103 can only move laterally and reciprocally along the direction of the second slide rail 1104 under the drive of the second ball screw 1102. The bottom end of the second screw slide 1103 is fixedly connected to the movable upper pressure knife 4 below it, away from the fixed pressure knife 13. The operation of the second reduction motor 1101 can drive the second ball screw 1102 to rotate, thereby driving the second screw slide 1103 and the movable upper pressure knife 4 below it to move laterally.

[0024] Furthermore, there are two of each of the first adjustment mechanism 10 and the second adjustment mechanism 11, and the two first adjustment mechanisms 10 and the two adjustment mechanisms 11 are symmetrically arranged with the vertical center line of the pressure plate 1 as the axis of symmetry. The first adjustment mechanisms 10 and the second adjustment mechanism 11 on both sides can either operate synchronously or be controlled independently, making the adjustment methods more diverse and easier to adjust and use according to the situation.

[0025] In an alternative embodiment, an auxiliary support mechanism 15, which provides further vertical auxiliary support, may be provided between the lower part of the rear fixed slide plate 601 and the top of the movable upper pressure knife 4, as shown in the attached figure. Figure 12-14 As shown, the auxiliary support mechanism 15 includes a lower top block 1501, a limiting guide screw 1502, and a third set screw 1503. The principle of the auxiliary support mechanism 15 is the same as that of the side support mechanism 6. The lower top block 1501 and the rear slide plate pressure block 602 have the same structure. The lower top block 1501 abuts against the top of the rear fixed slide plate 601 and the movable upper pressure knife 4 and is vertically aligned with the rear fixed slide plate 601. It provides the same support function for the top of the movable upper pressure knife 4 as the vertical support mechanism 5. The auxiliary support further enhances the vertical load capacity of the movable upper pressure knife 4. Both sides of the top of the lower top block 1501 are threaded with limiting guide screws 1502 for self-limitation. These limiting guide screws 1502 are hexagonal socket head cap screws, which, while limiting the lower top block 1501, ensure that it can move slightly along the screw's axial direction. The two limiting guide screws 1502 are threaded through the bottom of the lower top block 1501 and connected to the corresponding vertical position on the top of the movable upper pressure knife 4, ensuring that the lower top block 1501... 501 can only move vertically along the limit guide screw 1502, and the range of movement is the gap between the top of the lower push block 1501 and the top of the limit guide screw 1502; there are multiple third set screws 1503, and all of the multiple third set screws 1503 are vertically threaded through the movable upper pressure knife 4 and the part corresponding vertically to the lower push block 1501, and their top ends are all pressed against the bottom of the lower push block 1501, so that the upper surface of the lower push block 1501 abuts against the lower surface of the rear fixed slide plate 601, and the lower push block 1501 and the rear fixed slide plate 601 are in contact. It can still maintain relative sliding. The bottom of multiple third set screws 1503 are threaded with fixing nuts to fix them. The fixing nuts can fix the state of the third set screws 1503 and provide stable support and tightening for the lower top block 1501. Thus, the lower top block 1501 provides vertical auxiliary support for the movable upper pressure knife 4. All movable upper pressure knives 4 and inner upper pressure knives 14 are provided with this auxiliary support mechanism 15 on the side near the rear fixed slide plate 601 to ensure that each upper pressure knife has good vertical support strength.

[0026] Multiple first cylinders 702, second cylinders 801, and third cylinders 901 are all connected to an external air source via air pipes, and each air pipe connected to each first cylinder 702, second cylinder 801, and third cylinder 901 is equipped with an independently controllable control valve, facilitating independent control of each first cylinder 702, second cylinder 801, and third cylinder 901; the first geared motor 1001, the second geared motor 1101, and each control valve are all electrically connected to an external control unit and are electrically connected to an external circuit via wires, facilitating control of each structure through the control unit.

[0027] An operating method for a bending center pressure knife length fine-tuning mechanism suitable for heavy loads includes the following steps: 1. Based on the width of the workpiece to be bent, select several movable upper pressure knives 4 at corresponding positions as the tool group to participate in bending. Control the piston rod of the second cylinder 801 on each movable upper pressure knive 4 to retract, causing the pin 802 to disengage from the insertion hole 804 at the end of the adjacent connecting rod 803, so that the rigid connection between each movable upper pressure knive 4 in the participating group is released, and each can move independently laterally. At the same time, disconnect the pressure knife connection mechanism 8 between the outermost movable upper pressure knive 4 in the participating group and the adjacent non-participating group movable upper pressure knives 4, so that the two groups are structurally independent. Then, start the second reduction motor 1101 of the second adjustment mechanism 11 on both sides, and drive the second screw slide 1103 and the outermost movable upper pressure knive 4 fixed to it to move outward through the second ball screw 1102. Since the movable upper pressure knives 4 in the non-participating group are still connected through the pressure knife connection mechanism 8, all the movable upper pressure knives on this side that are not participating in bending will move outward synchronously to make room for bending. 2. Control the piston rod of the first cylinder 702 on each movable upper pressure knife 4 in the participating group to extend, so that the top cap 703 presses against the cylinder seat plate 701 of the adjacent movable upper pressure knife, thereby forming a small set gap between the two adjacent knives; by rotating the top cap 703, the effective ejection length of the piston rod can be finely adjusted to achieve stepless adjustment of the gap size, thereby precisely controlling the total length of the knives participating in the bending; since each movable upper pressure knife is equipped with a set of stepless adjustment mechanism 7, by individually controlling the ejection state of each first cylinder 702 and the position of the top cap, different gaps of different sizes can be generated simultaneously between multiple knives, and various precise total bending widths can be combined; 3. After bending is completed, the piston rods of all first cylinders 702 in the participating group retract, and each blade returns to its free adjacent state; the piston rod of the third cylinder 901 on the innermost movable upper pressure blade 4 in the non-participating group extends, driving the top plate 903 to rotate to a horizontal state through the fisheye joint 902, so that the end of the top plate 903 aligns with the fixing block 904 on the side of the adjacent movable upper pressure blade 4. The second adjustment mechanism 11 on both sides is activated to drive the movable upper pressure blade 4 of the non-participating group to move towards the center. The horizontal top plate 903 will push the outermost movable upper pressure blade of the participating group. The fixed block 904 of 4 then pushes all the movable upper pressure knives 4 in the group toward the center in sequence until the gap between each knife is completely eliminated and they are tightly fitted with the inner upper pressure knife 14 and the fixed pressure knife 13; then the piston rod of the third cylinder 901 is controlled to retract, the top plate 903 is rotated back to the vertical initial state, and the second adjustment mechanism 11 is activated again to make the movable upper pressure knives 4 that are not in the group continue to move toward the center until all the movable upper pressure knives 4, the inner upper pressure knife 14 and the fixed pressure knife 13 are all pressed against each other, and the initial compact arrangement is restored, thus completing the reset; 4. When long-term operation of the equipment causes wear gaps in the vertical support mechanism 5, the side support mechanism 6, or the auxiliary support mechanism 15, manual compensation and adjustment can be performed. Rotate the first set screw 506 on the side of the slide plate baffle 505 to push the lower slide plate 502 to move slightly laterally on the inclined fixed plate 504. Utilize the inclined effect to change the vertical height of the lower slide plate 502, ensuring that its upper surface is always in close contact with the upper fixed slide plate 501, thus restoring the vertical auxiliary support force. Rotate the second set screw 604 on the side of the rear slide plate back plate 603 to push the rear slide plate pressure block 602 to press against the side of the rear fixed slide plate 601, and tighten and fix it with the fastening screw 605 to ensure the rigidity of the lateral support and maintain bending accuracy. Rotate multiple third set screws 1503 to push the lower top block 1501 to move upward and press against the lower surface of the rear fixed slide plate 601. Lock and fix each third set screw 1503 with a fixing nut, so that the lower top block 1501 plays an auxiliary support role for each pressure knife, improving the vertical support force.

[0028] The above description is only for illustrating the present invention and should be understood as not being limited to the above embodiments. Various modifications that conform to the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A mechanism for fine-tuning the length of the pressure cutter at the bending center, suitable for heavy loads, characterized in that, include: The pressure plate (1) has linear guide rails (2) fixedly installed on both sides of its lower surface, and linear sliders (3) are slidably connected to the outside of the linear guide rails (2). The fixed pressure knife (13) is fixedly installed in the middle of the bottom end of the pressure plate (1) and has an inner upper pressure knife (14) on both sides. The movable upper pressure knife (4) is fixedly installed at the bottom of the linear slider (3) and there are several of them. The several movable upper pressure knives (4) are divided into two groups, and the two groups of movable upper pressure knives (4) are slidably connected to the two groups of linear guide rails (2) through the linear slider (3). A vertical support mechanism (5) is provided between the top of the movable upper pressure knife (4) and the bottom of the pressure plate (1); Side support mechanism (6) is located on the top of the side of the movable upper pressure knife (4) and connected to the bottom of the pressure plate (1); A stepless adjustment mechanism (7) is located on the top of the movable upper pressure knife (4) on the side away from the side support mechanism (6); The pressure knife connecting mechanism (8) is located on the top of the side of the movable upper pressure knife (4) and adjacent movable upper pressure knives (4) can be connected to each other through the pressure knife connecting mechanism (8); The pressing knife clamping mechanism (9) is set on the side of the movable upper pressing knife (4) and on several movable upper pressing knives (4) far from the center on the two linear guide rails (2). The first adjustment mechanism (10) is located in the middle of the side of the pressure plate (1) and its movable end is connected to the movable upper pressure knife (4) near the middle. The second adjustment mechanism (11) is located at the end of the side of the pressure plate (1) and its movable end is connected to the movable upper pressure knife (4) away from the center. The vertical support mechanism (5) includes an upper fixed slide plate (501), a lower slide plate (502), a guide screw (503), an inclined fixed plate (504), a slide plate baffle (505), and a first set screw (506). The upper fixed slide plate (501) is fixedly connected to the bottom of the pressure plate (1). The inclined fixed plate (504) is fixedly connected to the top of the movable upper pressure knife (4), and both sides of the plate are fixedly connected to slide plates baffles (505). The top of the sides of the two slide plates baffles (505) are threaded with a first set screw (506) that can abut against the lower slide plate (502). The lower slide plate (502) abuts against the upper fixed slide plate (501) and the inclined fixed plate (504), and both sides of the plate are threaded with guide screws (503). The top of the inclined plate (504) is inclined and tilts from one side of one slide plate baffle (505) to the other side of the slide plate baffle (505). The lower surface of the lower slide plate (502) has the same tilt angle as the top of the inclined plate (504) and fits against the upper surface of the inclined plate (504). Both sides of the upper surface of the inclined plate (504) are provided with waist-shaped grooves that are compatible with the guide screws (503), and the two guide screws (503) are respectively inserted into the two waist-shaped grooves. The side support mechanism (6) includes a rear fixed slide plate (601), a rear slide plate pressure block (602), a rear slide plate back plate (603), a second set screw (604), and a fastening screw (605). The rear fixed slide plate (601) is fixedly connected to the side of the bottom of the pressure plate (1). The bottom of the rear slide plate back plate (603) is fixedly connected to the top of the side of the movable upper pressure knife (4) by bolts. The rear slide plate pressure block (602) is fixedly installed between the top of the rear slide plate back plate (603) and the rear fixed slide plate (601) by fastening screw (605). The second set screw (604) is threaded through the side of the rear slide plate back plate (603) and abuts against the rear slide plate pressure block (602). The stepless adjustment mechanism (7) includes a cylinder seat plate (701), a first cylinder (702) and a top cap (703). The cylinder seat plate (701) is fixedly connected to the top of the side of the movable upper pressure knife (4) and the cylinder body of the first cylinder (702) is horizontally fixedly installed on the cylinder seat plate (701). The top cap (703) is rotatably connected to the end of the piston rod of the first cylinder (702) by a thread. The number of stepless adjustment mechanisms (7) is several, and multiple movable upper pressure knives (4) in the two sets of movable upper pressure knives (4) are provided with stepless adjustment mechanisms (7). The top cap (703) at the end of the piston rod of each first cylinder (702) can abut against the cylinder seat plate (701) on the adjacent movable upper pressure knives (4).

2. The bending center upper pressure knife length fine adjustment mechanism suitable for heavy loads according to claim 1, characterized in that, The pressure knife connecting mechanism (8) includes a second cylinder (801), a pin (802), a connecting rod (803), and a socket (804). The cylinder body of the second cylinder (801) is fixedly installed on the top of the movable upper pressure knife (4) near the first cylinder (702), and its piston rod passes through the interior of the movable upper pressure knife (4). The pin (802) is connected to the end of the piston rod of the first cylinder (702). The connecting rod (803) is fixedly connected to the movable upper pressure knife (4) on the side close to its adjacent movable upper pressure knife (4). The socket (804) is opened at the end of the connecting rod (803) away from the movable upper pressure knife (4).

3. The bending center upper pressure knife length fine adjustment mechanism suitable for heavy loads according to claim 2, characterized in that, The movable upper pressure knife (4) has a slot (12) on the side away from the connecting rod (803) that is horizontally corresponding to the connecting rod (803). Each connecting rod (803) on the side of the movable upper pressure knife (4) can be inserted into the slot (12) on the side of the adjacent movable upper pressure knife (4). The pin (802) is inserted laterally into the inside of the slot (12) and can be inserted into the insertion hole (804) at the end of the connecting rod (803) inserted into the slot (12).

4. The bending center upper pressure knife length fine adjustment mechanism suitable for heavy loads according to claim 1, characterized in that, The pressing knife clamping mechanism (9) includes a third cylinder (901), a fisheye connector (902), a top plate (903), and a fixing block (904). The bottom of the cylinder body of the third cylinder (901) is rotatably connected to the bottom of the movable upper pressing knife (4), and the fisheye connector (902) is fixedly connected to the top of the piston rod of the third cylinder (901). The end of the top plate (903) is rotatably connected to the middle of the movable upper pressing knife (4), and the middle part is rotatably connected to the fisheye connector (902). The fixing block (904) is fixedly connected to the side of another adjacent movable upper pressing knife (4), and the top plate (903) can abut against the fixing block (904) on the side of another adjacent movable upper pressing knife (4).

5. A bending center upper pressure knife length fine adjustment mechanism suitable for heavy loads according to claim 1, characterized in that, The two inner upper pressure knives (14) are slidably connected to the two linear guide rails (2) on one side near the middle of the pressure plate (1) via linear sliders (3) and correspond to the movable upper pressure knives (4) on both sides. The first adjustment mechanism (10) includes a first reduction motor (1001), a first ball screw (1002), a first screw slide (1003) and a first slide rail (1004). The first reduction motor (1001) and the first slide rail (1004) are fixedly installed on the side of the pressure plate (1) and the first ball screw (1002) is connected to the output end of the first reduction motor (1001) via a spline. The first screw slide (1003) is driven to the outside of the first ball screw (1002) and slidably connected to the outside of the first slide rail (1004). The bottom end of the first screw slide (1003) is fixedly connected to the inner upper pressure knives (14) below it.

6. The bending center upper pressure knife length fine adjustment mechanism suitable for heavy loads according to claim 1, characterized in that, The second adjustment mechanism (11) includes a second geared motor (1101), a second ball screw (1102), a second screw slide (1103), and a second slide rail (1104). The second geared motor (1101) is fixedly installed at the bottom of the side end face of the pressure plate (1), and the second ball screw (1102) is connected to the output end of the second geared motor (1101) via a spline. The second slide rail (1104) is fixedly connected to the bottom side of the pressure plate (1) near the second geared motor (1101) and is connected to the output end of the second ball screw (1102) via a spline. 102) Parallel to each other, the second screw slide (1103) is driven to the outside of the second ball screw (1102) and slidably connected to the outside of the second slide rail (1104), and the bottom end of the second screw slide (1103) is fixedly connected to the movable upper pressure knife (4) below it that is far away from the fixed pressure knife (13); the number of the first adjustment mechanism (10) and the second adjustment mechanism (11) are both two, and the two first adjustment mechanisms (10) and the two adjustment mechanisms (11) are symmetrically arranged with the vertical center line of the pressure plate (1) as the axis of symmetry.

7. A method for operating the bending center upper pressure knife length fine-tuning mechanism suitable for heavy loads as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. In the initial state, all the movable upper pressure knives (4) on both sides are pressed against each other and against the inner upper pressure knives (14) and fixed pressure knives (13) in the middle. Multiple movable upper pressure knives (4) on the same side are connected to each other through pressure knives connecting mechanisms (8). All stepless adjustment mechanisms (7) are in the retracted state. When it is necessary to adjust the length of the pressure knives, the number of movable upper pressure knives (4) that can fully participate in bending can be selected according to the width of the workpiece to be bent. The pressure knives connecting mechanisms (8) on each movable upper pressure knive (4) corresponding to the appropriate length position that matches the width of the workpiece to be bent are disengaged from the adjacent movable upper pressure knives (4). Then, the second adjustment mechanism (11) drives the other movable upper pressure knives (4) that do not participate in bending to move away from the fixed pressure knives (13) together, so that the movable upper pressure knives (4) that do not need to participate in bending the plate are pulled to the outside. The multiple movable upper pressure knives (4) that participate in bending on the inside and the inner upper pressure knives (14) are in a relatively movable state. S2. When the adjustment is completed, if the end of the movable upper pressure knife (4) that participates in bending and corresponds to the edge of the workpiece cannot be fully aligned with the edge of the workpiece, the distance between the multiple movable upper pressure knives (4) participating in bending can be finely adjusted by the stepless adjustment mechanism (7). The movement of one or more stepless adjustment mechanisms (7) can be controlled according to the required adjustment range, so that the length of the pressure knife in bending can be fully aligned with the width of the workpiece. Each stepless adjustment mechanism (7) can be adjusted independently. The distance between the inner upper pressure knife (14) and each movable upper pressure knife (4) and the fixed pressure knife (13) can be adjusted by the first adjustment mechanism (10), so that the distance between the movable upper pressure knives (4) participating in bending on both sides can be adjusted more accurately. S3. When the movable upper pressure knife (4) participating in the bending presses the workpiece, the external bending mechanism bends the workpiece. The movable upper pressure knife (4) will be subjected to vertical and oblique loads. The lower slide plate (502) in the vertical support mechanism (5) can press against the upper fixed slide plate (501) and the inclined fixed plate (504), thereby providing lower auxiliary support for the movable upper pressure knife (4). The rear slide plate pressure block (602) in the side support mechanism (6) can press against the rear fixed slide plate (601) and the rear slide plate back plate (603), providing side auxiliary support for the movable upper pressure knife (4), improving the vertical and horizontal load strength of the movable upper pressure knife (4), and making it suitable for heavy-duty bending conditions. The vertical support mechanism (5) and the side support mechanism (6) can be manually adjusted according to the state of the movable upper pressure knife (4) after a long period of operation, so that it always provides stable and firm support for the movable upper pressure knife (4). S4. After bending the workpiece and removing it, control each stepless adjustment mechanism (7) to retract to its initial state. Then, lift the pressure knife clamping mechanism (9) on the movable upper pressure knife (4) that is closest to the movable upper pressure knife (4) that is involved in bending among the multiple movable upper pressure knives (4) that are not involved in bending. Then, run the second adjustment mechanism (11) on both sides to drive the multiple movable upper pressure knives (4) that are not involved in bending to move towards the center. The lifted pressure knife clamping mechanism (9) will lift the original movable upper pressure knife that was involved in bending. The gap between each movable upper pressure knife (4) during bending becomes zero and they all move towards the center. After all the movable upper pressure knives (4) involved in bending are pressed against each other, the pressure knife pressing mechanism (9) is retracted again, and the movable upper pressure knives (4) on both sides are driven to continue moving towards the center through the second adjustment mechanism (11) until all the movable upper pressure knives (4), the inner upper pressure knife (14), and the fixed pressure knife (13) are pressed against each other, thereby realizing the retraction of the movable upper pressure knives (4).

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