Double-acting hydraulic sheet drawing press

Abstract

The invention provides a double-acting sheet drawing hydraulic press, which relates to the technical field of metal part processing devices, and comprises a base, a plurality of support columns are fixedly mounted on the base, a top frame is fixedly mounted at the tops of the plurality of support columns, a mounting beam plate is slidably mounted on the plurality of support columns in a sleeving manner, and a hydraulic cylinder for driving the mounting beam plate to slide on the support columns is mounted on the top frame; a bottom beam plate is slidably mounted on the top face of the base, and dismounting mechanisms are mounted on the top face of the bottom beam plate and the bottom face of the mounting beam plate correspondingly. According to the double-acting thin plate drawing hydraulic machine, through the arrangement of the base, the supporting columns, the top frame, the mounting beam plate, the hydraulic cylinder, the bottom beam plate and the dismounting and mounting mechanism, when a mold is mounted, a T-shaped mounting piece on the mold can be clamped and fixed, and meanwhile, the T-shaped mounting piece can be subjected to anti-falling reinforcement; and the time for disassembling and assembling the mold is shortened, the disassembling and assembling effect is improved, and the labor amount of workers is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of metal parts processing devices, in particular to a double-action thin plate stretching hydraulic press. Background Art

[0002] Double-action thin plate stretching hydraulic press is a kind of equipment specially used for metal sheet stretching and forming. It is particularly suitable for the stretching and bending of large thin plate coverings in the automotive, aviation, aerospace and other industries. It can also be used for pressure testing and matching of large stretching molds. The main structural feature of the double-action thin plate stretching hydraulic press is that there are two inner and outer movable beams. The stretching movable beam is installed inside and the edge pressing movable beam is installed outside. When double-action stretching is carried out, the stretching movable beam and the edge pressing movable beam can be quickly lowered together, and they will be lowered slowly when approaching the workpiece. When the edge pressing movable beam presses the workpiece on all sides, the edge pressing movable beam no longer descends and becomes a pressure holding state. At this time, the stretching movable beam continues to descend for stretching. After the stretching process is completed, the stretching movable beam can realize pressure holding delay, pressure relief and rapid return. The edge pressing movable beam also relieves pressure and returns rapidly accordingly, and then the hydraulic pad and the ejector pin eject the workpiece.

[0003] When the double-acting thin plate stretching hydraulic press is processing products of different shapes, it is necessary to replace different types of molds. However, when dismantling, remove the upper mold: move the slider of the hydraulic press to the appropriate position so that the upper mold can be easily disassembled, loosen the upper mold fixing bolts, usually these bolts are located around the upper mold base, use a copper rod to gently tap the upper mold base to separate it from the slider; remove the lower mold: loosen the lower mold fixing bolts, these bolts are usually located around the lower mold base, use a sling or forklift to move the lower mold away from the workbench to ensure smooth operation and avoid collision. The disassembly and assembly of the bolts takes a lot of time (for example, when tightening the bolts, it is necessary to pre-tighten them first to ensure that the force around the mold is balanced before fully tightening them), which is labor-intensive and inconvenient. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a double-action thin plate stretching hydraulic press.

[0005] The double-action thin plate stretching hydraulic press proposed in the present invention comprises a base, a plurality of pillars are fixedly mounted on the base, a top frame is fixedly mounted on the tops of the plurality of pillars, the mounting beam plate is slidably sleeved on the plurality of pillars, and a hydraulic cylinder for driving the mounting beam plate to slide on the pillars is mounted on the top frame; A bottom beam plate is slidably mounted on the top surface of the base, and a disassembly and assembly mechanism is mounted on the top surface of the bottom beam plate and the bottom surface of the mounting beam plate; The disassembly and assembly mechanism includes a mounting plate, an L-shaped clamping block, a driving structure, a tightening structure and an anti-slip structure; the bottom beam plate and the mounting beam plate are both provided with a receiving groove, the mounting plate is located in the receiving groove, the number of the L-shaped clamping blocks is two, the two L-shaped clamping blocks are rotatably mounted at both ends of the mounting plate, a T-shaped clamping groove can be formed between the two L-shaped clamping blocks, the T-shaped mounting piece of the mold can be clamped in the T-shaped clamping groove, and the driving structure can drive the two L-shaped clamping blocks to rotate on the mounting plate; The clamping structure can drive the two L-shaped clamping blocks to clamp on both sides of the T-shaped mounting part of the mold; The anti-slip structure can fix the position of the T-shaped mounting piece of the mold on the mounting plate.

[0006] Preferably, the driving structure includes a gear roller and a tooth plate; a mounting groove is provided on the L-shaped clamping block, the gear roller is fixedly installed in the mounting groove of the L-shaped clamping block, a transverse displacement groove is provided on the mounting plate, the tooth plate is slidably installed in the transverse displacement groove, the tooth plate is meshed with the gear roller, a driving spring is installed in the transverse displacement groove, and both ends of the driving spring are respectively connected to the end inner wall of the transverse displacement groove and one side of the tooth plate.

[0007] Preferably, a mounting hole is provided on the bottom inner wall of the storage groove, the No. 1 hydraulic cylinder is fixedly mounted in the mounting hole, the mounting plate is fixedly mounted on the output shaft of the No. 1 hydraulic cylinder, and the inner walls on both sides of the storage groove are inclined surfaces; When the No. 1 hydraulic cylinder drives the mounting plate to move up and down in the receiving groove, the side surfaces of the two tooth plates slide on the inclined inner walls on both sides of the receiving groove respectively.

[0008] Preferably, the clamping structure includes a clamping pin, a limiting slide block, a return spring and a No. 2 hydraulic cylinder; the top surface of the transverse section of the T-shaped mounting part of the mold is an inclined surface, the end of the clamping pin is an inclined surface, the L-shaped clamping block is provided with a through groove that slides with the clamping pin, one end of the clamping pin is an inclined surface, the limiting slide block is fixedly connected to the clamping pin, the L-shaped clamping block is provided with a limiting slide groove that slides with the limiting slide groove, the return spring is located in the limiting slide groove, the two ends of the return spring respectively abut against the end of the limiting slide groove and the limiting slide block, the inner walls on both sides of the storage groove are provided with transverse grooves, the No. 2 hydraulic cylinder is fixedly installed in the transverse groove, and the output shaft of the No. 2 hydraulic cylinder can abut against the other end of the clamping pin.

[0009] Preferably, a connecting hard pipe is connected between the No. 1 hydraulic cylinder and the No. 2 hydraulic cylinder, and a valve is installed in the middle section of the connecting hard pipe.

[0010] Preferably, the anti-slip structure comprises an L-shaped anti-slip part, an L-shaped connecting rod, a toggle block and a disengagement spring; the mounting plate is provided with a moving groove that slidably cooperates with the L-shaped anti-slip part, the mold T-shaped mounting part is provided with an L-shaped slot that matches the L-shaped anti-slip part, the mounting plate is provided with a driving groove that slidably cooperates with the L-shaped connecting rod, the toggle block is fixedly connected to the tooth plate, the toggle block can abut against the side of the bent section of the L-shaped connecting rod, and when the toggle block slides, it can push the L-shaped connecting rod to slide in the driving groove; The mounting plate is provided with a placement groove connected with the moving groove, the disengagement spring is located in the placement groove, and two ends of the disengagement spring are respectively against the inner wall of the placement groove and the L-shaped anti-detachment piece.

[0011] Preferably, an adjustment groove is provided on the top surface of the base, the bottom beam plate is slidably installed in the adjustment groove, a supporting hydraulic rod is rotatably installed on the base, and the output shaft of the supporting hydraulic rod is rotatably installed on the bottom surface of the bottom beam plate.

[0012] The double-action thin plate stretching hydraulic press proposed by the present invention has the following beneficial effects: through the provision of a base, a support, a top frame, a mounting beam plate, a hydraulic cylinder, a bottom beam plate and a disassembly and assembly mechanism, when installing the mold, the T-shaped mounting parts on the mold can be clamped and fixed, and the T-shaped mounting parts can be reinforced to prevent them from falling off, thereby reducing the time used for disassembly and assembly of the mold, improving the disassembly and assembly effect, and reducing the workload of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The figure is a schematic diagram of the overall structure of a double-action thin plate stretching hydraulic press proposed by the present invention.

[0014] Figure 2 The present invention provides a cross-sectional view of a single disassembly and assembly mechanism on a bottom beam plate in a double-action thin plate stretching hydraulic press.

[0015] Figure 3 The present invention provides a schematic structural diagram of components such as a mounting plate, an L-shaped clamping block and a tooth plate in a double-action thin plate stretching hydraulic press.

[0016] Figure 4 The present invention provides a schematic structural diagram of a tooth plate and a toggle block in a double-action thin plate stretching hydraulic press.

[0017] Figure 5 The present invention provides a schematic structural diagram of a mounting plate in a double-action thin plate stretching hydraulic press.

[0018] Figure 6 The present invention provides a schematic structural diagram of an L-shaped clamping block in a double-action thin plate stretching hydraulic press.

[0019] Figure 7The side cross-sectional view of the bottom beam plate of the double-action thin plate stretching hydraulic press proposed by the present invention when it extends out of the base.

[0020] In the figure: 1. Base; 2. Pillar; 3. Top frame; 4. Mounting beam; 5. Bottom beam; 6. Mounting plate; 7. L-shaped clamping block; 8. No. 1 hydraulic cylinder; 9. Gear roller; 10. Tooth plate; 11. Driving spring; 12. Clamping pin; 13. Limiting slider; 14. Reset spring; 15. No. 2 hydraulic cylinder; 16. Connecting hard pipe; 17. Valve; 18. L-shaped anti-slip part; 19. L-shaped connecting rod; 20. Toggle block; 21. Disengagement spring; 22. Support hydraulic rod. DETAILED DESCRIPTION

[0021] Reference Figure 1-Figure 7 The present invention proposes a double-acting thin plate stretching hydraulic press, comprising a base 1, on which a plurality of pillars 2 are fixedly mounted, a top frame 3 is fixedly mounted on the tops of the plurality of pillars 2, a mounting beam plate 4 is slidably mounted on the plurality of pillars 2, and a hydraulic cylinder for driving the mounting beam plate 4 to slide on the pillars 2 is mounted on the top frame 3. In actual situations, an upper die is mounted on the bottom surface of the mounting beam plate 4, a bottom beam plate 5 is slidably mounted on the top surface of the base 1, and a disassembly mechanism is mounted on the top surface of the bottom beam plate 5 and the bottom surface of the mounting beam plate 4. The lower die is mounted on the top surface of the bottom beam plate 5 through the disassembly mechanism. During operation, a metal original is placed on the lower die, and the mounting beam plate 4 and the upper die are driven downward by the hydraulic cylinder. The upper die and the lower die work together to stretch the metal original into shape. After forming, the finished product is ejected by the ejection structure in the lower die to complete demoulding. The installation methods of the upper die and the lower die are roughly the same, so the following content only describes the installation of the lower die.

[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6As shown in, the disassembly and assembly mechanism includes a mounting plate 6, an L-shaped clamping block 7, a driving structure, a tightening structure and an anti-slip structure; a receiving groove is provided on the bottom beam plate 5 and the mounting beam plate 4, and the mounting plate 6 is located in the receiving groove. There are two L-shaped clamping blocks 7, which are rotatably mounted at both ends of the mounting plate 6, respectively. A T-shaped clamping groove can be formed between the two L-shaped clamping blocks 7, and the T-shaped mounting part of the mold can be clamped in the T-shaped clamping groove. The driving structure can drive the two L-shaped clamping blocks 7 to rotate on the mounting plate 6; when installing the mold, the driving structure rotates the two L-shaped clamping blocks 7 to open them, and the T-shaped mounting part on the mold is placed between the two L-shaped clamping blocks 7, and the bottom surface of the mold is against the two L-shaped clamping blocks 7, and then the driving structure drives the mold to rotate. The two L-shaped clamping blocks 7 are rotated towards each other, so that the T-shaped mounting part on the mold is clamped and fixed by the two L-shaped clamping blocks 7, and the installation of the mold is completed. The operation is simple and convenient, and there is no need to disassemble and install screws one by one, which reduces the labor of the staff; the clamping structure can drive the two L-shaped clamping blocks 7 to clamp on both sides of the T-shaped mounting part of the mold. In actual situations, the clamping structure is pressed against the two sides of the two L-shaped clamping blocks 7 that are far away from each other, so that the two L-shaped clamping blocks 7 can clamp the T-shaped mounting part of the mold more tightly, ensuring the firmness and stability of the mold installation; the anti-slip structure can fix the position of the T-shaped mounting part of the mold on the mounting plate 6. After installation, the position of the T-shaped mounting part on the mounting plate 6 is fixed, thereby increasing the firmness and stability of the mold installation.

[0023] like Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown in, the driving structure includes a gear roller 9 and a tooth plate 10; an installation groove is provided on the L-shaped clamping block 7, and the gear roller 9 is fixedly installed in the installation groove of the L-shaped clamping block 7, and a transverse groove is provided on the mounting plate 6, and the tooth plate 10 is slidably installed in the transverse groove, and the tooth plate 10 is meshed with the gear roller 9, and a driving spring 11 is installed in the transverse groove, and the two ends of the driving spring 11 are respectively connected to the inner wall of the end of the transverse groove and one side of the tooth plate 10. When the L-shaped clamping block 7 is driven to rotate, the tooth plate 10 is pushed to move in the transverse groove. Since the tooth plate 10 and the gear roller 9 are meshed, the tooth plate 10 drives the gear roller 9 to rotate, and the gear roller 9 drives the L-shaped clamping block 7 to rotate synchronously, thereby realizing the control of the rotation and opening and closing action of the L-shaped clamping block 7, and the driving spring 11 can drive the tooth plate 10 to move out of the transverse groove.

[0024] like Figure 2As shown in , a mounting hole is provided on the bottom inner wall of the storage groove, and the No. 1 hydraulic cylinder 8 is fixedly installed in the mounting hole, and the mounting plate 6 is fixedly installed on the output shaft of the No. 1 hydraulic cylinder 8. The inner walls on both sides of the storage groove are inclined surfaces. When the No. 1 hydraulic cylinder 8 drives the mounting plate 6 to rise and fall in the storage groove, the sides of the two tooth plates 10 slide on the inclined inner walls on both sides of the storage groove respectively. In actual situations, a slide rail is installed between the inner walls of the storage groove, and one side of the tooth plate 10 is fixedly installed on the slider of the slide rail to improve the smoothness of sliding and reduce friction resistance. When the L-shaped clamping block 7 is driven to rotate and open, the No. 1 hydraulic cylinder 8 works to drive the mounting plate 6 It rises in the storage groove, and when the mounting plate 6 rises, the two tooth plates 10 will be driven to rise synchronously. The sides of the two tooth plates 10 that are away from each other slide and cooperate on the inclined surfaces on both sides of the storage groove, so that the tooth plate 10 is laterally retracted in the transverse groove. The tooth plate 10 drives the gear roller 9 and the L-shaped clamping block 7 to rotate and open, and then the mold is placed on the mounting plate 6. The No. 1 hydraulic cylinder 8 drives the mounting plate 6 to descend. Under the rebound action of the driving spring 11 and the traction action of the slide rail, the tooth plate 10 moves outward in the transverse groove, thereby driving the two L-shaped clamping blocks 7 to rotate together to clamp and fix the T-shaped mounting part on the mold.

[0025] like Figure 2 and Figure 6 As shown in, the clamping structure includes a clamping pin 12, a limiting slider 13, a reset spring 14 and a No. 2 hydraulic cylinder 15; the top surface of the transverse section of the T-shaped mounting part of the mold is an inclined surface, the end of the clamping pin 12 is an inclined surface, a through groove that slides with the clamping pin 12 is formed on the L-shaped clamping block 7, one end of the clamping pin 12 is an inclined surface, the limiting slider 13 is fixedly connected to the clamping pin 12, a limiting slide groove that slides with the limiting slider 13 is formed in the L-shaped clamping block 7, the reset spring 14 is located in the limiting slide groove, and the two ends of the reset spring 14 are respectively against the end of the limiting slide groove and the limiting slider 13, the inner walls on both sides of the storage groove are provided with transverse grooves, the No. 2 hydraulic cylinder 15 is fixedly installed in the transverse groove, and the output of the No. 2 hydraulic cylinder 15 The shaft can be abutted against the other end of the clamping pin 12. In actual situations, it is not effective to rely solely on the toothed plate 10 to drive the rotation of the gear roller 9 to fix the mold. Therefore, the No. 2 hydraulic cylinder 15 will be used. The output shaft of the No. 2 hydraulic cylinder 15 abuts against the other end of the clamping pin 12, pushing the clamping pin 12 to move in the through groove, so that the end inclined surface of the clamping pin 12 abuts against the transverse section inclined surface of the T-shaped mounting part of the mold. Under the cooperation of the inclined surface, the T-shaped mounting part has a tendency to approach the mounting plate 6, thereby increasing the firmness of the installation of the T-shaped mounting part and reducing the force on the L-shaped clamping block 7. At the same time, the output shaft of the No. 2 hydraulic cylinder 15 can abut against the side of the L-shaped clamping block 7 to ensure the stability and firmness of the position of the L-shaped clamping block 7.

[0026] It should be noted that the output shaft of the No. 2 hydraulic cylinder 15 can always rest against the other end of the clamping pin 12. Therefore, a side plate can be fixedly installed on the other side of the clamping pin 12 to increase the contact area so that the end of the No. 2 hydraulic cylinder 15 can always rest against the other end of the clamping pin 12.

[0027] like Figure 2 As shown in , there is a connecting hard pipe 16 between the No. 1 hydraulic cylinder 8 and the No. 2 hydraulic cylinder 15, and a valve 17 is installed in the middle section of the connecting hard pipe 16. Through the connection between the No. 1 hydraulic cylinder 8 and the No. 2 hydraulic cylinder 15, the two hydraulic cylinders can work simultaneously. For example, when the output shaft of the No. 1 hydraulic cylinder 8 is extended, the valve 17 is opened to extract the oil in the No. 2 hydraulic cylinder 15, and the output shaft of the No. 2 hydraulic cylinder 15 is retracted. That is, when the output shaft of the No. 1 hydraulic cylinder 8 is raised to drive the two L-shaped clamping blocks 7 to rotate and open, the output shaft of the No. 2 hydraulic cylinder 15 is retracted to ensure that the L-shaped clamping blocks 7 have enough position to rotate and open, and vice versa. After the mold is fixed, the valve 17 is closed to ensure that the two hydraulic cylinders are not connected and cannot work simultaneously. Even if one of them fails, the firmness and stability of the mold installation can be ensured.

[0028] like Figure 2 , Figure 3 and Figure 5As shown in, the anti-slip structure includes an L-shaped anti-slip member 18, an L-shaped connecting rod 19, a toggle block 20 and a disengagement spring 21; a moving groove that slides with the L-shaped anti-slip member 18 is provided on the mounting plate 6, and an L-shaped slot that matches the L-shaped anti-slip member 18 is provided on the mold T-shaped mounting member. A driving groove that slides with the L-shaped connecting rod 19 is provided in the mounting plate 6. The toggle block 20 is fixedly connected to the tooth plate 10, and the toggle block 20 can abut against the side of the bent section of the L-shaped connecting rod 19. When the toggle block 20 slides, it can push the L-shaped connecting rod 19 to slide in the driving groove. A placement groove connected to the moving groove is provided on the mounting plate 6, and the disengagement spring 21 is located in the placement groove. The two ends of the disengagement spring 21 respectively abut against the inner inner wall of the placement groove and the L-shaped anti-slip member 18. In actual situations, in order to increase the firmness and stability of the mold installation, when installing the mold, it is necessary to The L-shaped slot on the T-shaped mounting part of the mold is aligned with the L-shaped anti-slip piece 18, so that the L-shaped anti-slip piece 18 enters the L-shaped slot. When the two L-shaped clamping blocks 7 are driven to close, the two tooth plates 10 move away from each other. The tooth plate 10 first moves a distance until the L-shaped anti-slip piece 18 moves laterally and can be inserted into the L-shaped slot of the T-shaped mounting part. The toggle block 20 on the tooth plate 10 drives the L-shaped connecting rod 19 to move synchronously, and the L-shaped anti-slip piece 18 is driven by the L-shaped connecting rod 19 to move laterally and snap into the L-shaped slot, completing the clamping operation of the T-shaped mounting part (after the upper mold is installed, the L-shaped anti-slip piece 18 will share part of the gravity of the mold, reducing the force on the L-shaped clamping block 7 and improving the firmness and stability of the mold installation). In three steps, clamping, pressing and anti-slipping can be completed at the same time, saving time for disassembly and assembly, and improving the work efficiency of installation without the need for step-by-step operation.

[0029] like Figure 1 and Figure 7 As shown in the figure, an adjustment groove is opened on the top surface of the base 1, and the bottom beam plate 5 is slidably installed in the adjustment groove through an electric slide rail. A supporting hydraulic rod 22 is rotatably installed on the base 1, and the output shaft of the supporting hydraulic rod 22 is rotatably installed on the bottom surface of the bottom beam plate 5. When installing the lower mold, the electric slide rail and the supporting hydraulic rod 22 work at the same time, so that the bottom beam plate 5 moves laterally to the side, and then a crane or other tools are used to place the bottom on the bottom beam plate 5 for installation, thereby increasing the installation environment space and providing convenience for disassembly and assembly operations.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double-action sheet metal stretching hydraulic press, characterized in that: The invention comprises a base (1), a plurality of pillars (2) are fixedly mounted on the base (1), a top frame (3) is fixedly mounted on the tops of the plurality of pillars (2), the mounting beam plate (4) is slidably mounted on the plurality of pillars (2), and a hydraulic cylinder for driving the mounting beam plate (4) to slide on the pillars (2) is mounted on the top frame (3); A bottom beam plate (5) is slidably mounted on the top surface of the base (1), and a disassembly and assembly mechanism is mounted on the top surface of the bottom beam plate (5) and the bottom surface of the mounting beam plate (4); The disassembly and assembly mechanism comprises a mounting plate (6), an L-shaped clamping block (7), a driving structure, a clamping structure and an anti-slip structure; the bottom beam plate (5) and the mounting beam plate (4) are both provided with a receiving groove, the mounting plate (6) is located in the receiving groove, the number of the L-shaped clamping blocks (7) is two, the two L-shaped clamping blocks (7) are rotatably mounted on the two ends of the mounting plate (6), a T-shaped clamping groove can be formed between the two L-shaped clamping blocks (7), the T-shaped mounting part of the mold can be clamped in the T-shaped clamping groove, and the driving structure can drive the two L-shaped clamping blocks (7) to rotate on the mounting plate (6); The clamping structure can drive two L-shaped clamping blocks (7) to clamp on both sides of the T-shaped mounting part of the mold; The anti-slip structure can fix the position of the T-shaped mounting piece of the mold on the mounting plate (6).

2. A double-action sheet metal stretching hydraulic press according to claim 1, characterized in that: The driving structure comprises a gear roller (9) and a tooth plate (10); a mounting groove is provided on the L-shaped clamping block (7), the gear roller (9) is fixedly mounted in the mounting groove of the L-shaped clamping block (7), a transverse displacement groove is provided on the mounting plate (6), the tooth plate (10) is slidably mounted in the transverse displacement groove, the tooth plate (10) is meshed with the gear roller (9), a driving spring (11) is installed in the transverse displacement groove, and two ends of the driving spring (11) are respectively connected to the inner wall of the end of the transverse displacement groove and one side of the tooth plate (10).

3. A double-action sheet metal stretching hydraulic press according to claim 2, characterized in that: A mounting hole is provided on the bottom inner wall of the storage groove, the No. 1 hydraulic cylinder (8) is fixedly mounted in the mounting hole, the mounting plate (6) is fixedly mounted on the output shaft of the No. 1 hydraulic cylinder (8), and the inner walls on both sides of the storage groove are inclined surfaces; When the No. 1 hydraulic cylinder (8) drives the mounting plate (6) to move up and down in the receiving groove, the side surfaces of the two tooth plates (10) slide on the inclined inner walls of the receiving groove on both sides respectively.

4. A double-action sheet metal stretching hydraulic press according to claim 3, characterized in that: The clamping structure comprises a clamping pin (12), a limiting slide block (13), a return spring (14) and a No. 2 hydraulic cylinder (15); the top surface of the transverse section of the T-shaped mounting part of the mold is an inclined surface, the end of the clamping pin (12) is an inclined surface, a through groove for slidingly cooperating with the clamping pin (12) is formed on the L-shaped clamping block (7), one end of the clamping pin (12) is an inclined surface, the limiting slide block (13) is fixedly connected to the clamping pin (12), and the A limiting groove that slidably cooperates with the limiting slider (13) is provided in the L-shaped clamping block (7), and the return spring (14) is located in the limiting groove. The two ends of the return spring (14) respectively abut against the end of the limiting groove and the limiting slider (13). The inner walls on both sides of the storage groove are provided with transverse grooves. The second hydraulic cylinder (15) is fixedly installed in the transverse groove, and the output shaft of the second hydraulic cylinder (15) can abut against the other end of the clamping pin (12).

5. A double-action sheet metal stretching hydraulic press according to claim 4, characterized in that: A connecting hard pipe (16) is connected between the No. 1 hydraulic cylinder (8) and the No. 2 hydraulic cylinder (15), and a valve (17) is installed in the middle section of the connecting hard pipe (16).

6. A double-action sheet metal stretching hydraulic press according to claim 3, characterized in that: The anti-slip structure comprises an L-shaped anti-slip component (18), an L-shaped connecting rod (19), a toggle block (20) and a disengagement spring (21); the mounting plate (6) is provided with a movable groove which is slidably matched with the L-shaped anti-slip component (18); the mold T-shaped mounting component is provided with an L-shaped slot which is matched with the L-shaped anti-slip component (18); the mounting plate (6) is provided with a driving groove which is slidably matched with the L-shaped connecting rod (19); the toggle block (20) is fixedly connected to the tooth plate (10); the toggle block (20) can abut against the side of the bent section of the L-shaped connecting rod (19); when the toggle block (20) slides, it can push the L-shaped connecting rod (19) to slide in the driving groove; The mounting plate (6) is provided with a placement groove which is in communication with the moving groove. The disengagement spring (21) is located in the placement groove. The two ends of the disengagement spring (21) respectively abut against the inner wall of the placement groove and the L-shaped anti-disengagement piece (18).

7. A double-action sheet metal stretching hydraulic press according to claim 1, characterized in that: An adjustment groove is provided on the top surface of the base (1), and the bottom beam plate (5) is slidably mounted in the adjustment groove. A supporting hydraulic rod (22) is rotatably mounted on the base (1), and an output shaft of the supporting hydraulic rod (22) is rotatably mounted on the bottom surface of the bottom beam plate (5).

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