Mechanical spring internal high-pressure forming hydraulic machine

Abstract

The present application relates to the technical field of mechanical spring forming preparation, and particularly relates to a mechanical spring internal high-pressure forming hydraulic machine, when horizontal push cylinder drives a cylinder stop to extend, the cylinder stop abuts against the end of a circular pipe on a lower die, the main cylinder drives a sliding block to move downward, the upper die and the lower die clamp the circular pipe, high-pressure liquid is injected into the circular pipe through an injection hole, so that the hollow circular pipe is used as a raw material, the high-pressure liquid exerts liquid pressure on the pipe cavity and the cylinder stop exerts an axial load, the circular pipe deforms in a given die cavity until the circular pipe is completely attached to the inner side wall of the upper die and the lower die, a mechanical spring with a required shape is obtained, high-pressure forming is completed, the process is simple, the weight of the circular pipe after high-pressure forming is increased due to the residual high-pressure liquid, the pressure material disc rotates to make the other end of the material disc be raised, the circular pipe on the material disc is used to receive the discharged material of the feeding part, automatic feeding and demolding are realized, the operation is simple, and the method is suitable for batch continuous and efficient production and preparation.

Description

Technical Field

[0001] This invention relates to the field of mechanical spring forming and manufacturing technology, and in particular to a high-pressure forming hydraulic press for mechanical springs. Background Technology

[0002] Mechanical springs are hollow tubes with multiple folds on their surface, formed from hollow round tubes. Currently, methods such as thermoforming, segmented welding, and mechanical stamping are commonly used. However, thermoforming easily causes oxidation of the tube, affecting the strength of the metal. Segmented welding and mechanical stamping are cumbersome, inconvenient, and inefficient. In contrast, existing technologies, such as the hydraulic forming device for automotive pipe ends disclosed in Chinese patent document CN104826952B, include a hydraulic mold and a clamping mold mounted on a worktable. The hydraulic mold includes a mold base, a mold column, and a hydraulic cylinder. The clamping mold includes an upper module, a lower module, and a clamping hydraulic cylinder, reliably clamping the pipe and continuously processing the pipe ends to improve production efficiency. However, the pipes require manual loading and unloading, making automatic loading and demolding impossible, resulting in cumbersome operation and low efficiency in continuous batch production. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide a high-pressure forming hydraulic press for mechanical springs, so as to solve the problems of cumbersome operation and low efficiency in the existing mechanical spring forming process.

[0004] To achieve the above objectives, the present invention provides a hydraulic press for high-pressure forming of mechanical springs, comprising a base, a worktable mounted on the base, and further comprising:

[0005] The main cylinder is mounted on the base. The output end of the main cylinder is connected to a slider, and the bottom end of the slider is connected to the upper mold.

[0006] The material tray is rotatably connected to the worktable. One end of the material tray is equipped with a lower mold, and the other end is equipped with an upper part for holding round tubes. The main cylinder drives the slider to move down, and the upper mold and lower mold clamp the round tubes.

[0007] Horizontal push cylinders are symmetrically arranged on both sides of the worktable. A stop cylinder is connected to the output end of the horizontal push cylinder. A liquid injection hole is opened at the end of the stop cylinder. When the horizontal push cylinder drives the stop cylinder to extend, the stop cylinder presses against the end of the round tube on the lower mold. High-pressure liquid is injected into the round tube through the liquid injection hole. The high-pressure liquid pushes the round tube to deform until the round tube is completely attached to the inner side wall of the upper mold and the lower mold. The round tube after high pressure forming presses the material tray to rotate, so that the other end of the material tray is raised to receive the round tube discharged from the loading section.

[0008] Preferably, the base has multiple columns erected at its top, with the top of each column fixedly connected to the main cylinder. The slider has through holes for the columns to pass through, allowing the slider to slide freely up and down along the columns.

[0009] Preferably, a material feeding groove is recessed at one end of the worktable, the material feeding groove is located below the lower mold, and a fixed platform is provided next to the material feeding groove. In the initial state, the material tray is horizontal, and the end of the material tray away from the material feeding groove abuts against the fixed platform.

[0010] Preferably, the material tray is provided with a slide, and the lower mold is located at one end of the slide. The lower mold is designed as a groove that covers the lower part of the round tube. The end of the slide away from the lower mold is provided with a feeding position. The end of the feeding position away from the lower mold is provided with a high stop block, and the end of the feeding position close to the lower mold is provided with a low stop block. The round tube after high pressure forming has residual high pressure liquid inside, and its weight is greater than that of the round tube at the other end, so that the material tray rotates. The round tube after high pressure forming rotates to the feeding groove for feeding. The other end of the material tray tilts up, and the round tube discharged from the feeding part falls to the feeding position, pushing the round tube on the feeding position so that the round tube on the feeding position passes over the low stop block and moves to the lower mold. The round tubes at both ends drive the material tray to rotate, and the material tray returns to a horizontal state.

[0011] Preferably, the feeding section includes a material cylinder, in which multiple round tubes are stacked vertically. Flip plates are rotatably connected to both sides of the bottom end of the material cylinder. In the initial state, the flip plates rotate to close and support the bottommost round tube. When one end of the material tray rotates and tilts up, it triggers the flip plates on both sides to rotate and separate, so that the bottommost round tube falls to the upper material position.

[0012] Preferably, the top of the barrel is designed to be open, and a conveyor belt is provided on one side of the top of the barrel for conveying the round tube into the barrel.

[0013] Preferably, a torsion spring is provided at the bottom end of the material cylinder and the rotating connection of the flip plate, which is used to drive the flip plates on both sides to rotate and close. An electromagnetic block is provided at the bottom end of the flip plate, and a power supply unit is connected to the side end of the material cylinder. The power supply unit and the electromagnetic block are electrically connected. A push button switch is provided at the bottom end of the power supply unit. A stop rod is connected to one end of the material tray. When one end of the material tray rotates and tilts up, the stop rod rotates and pushes the push button switch, triggering the power supply unit to cut off the power.

[0014] Preferably, a discharge port is provided on the side end of the feeding trough. The size of the discharge port is adapted to the round tube after high pressure forming. When the round tube after high pressure forming is transferred into the feeding trough, it is discharged through the discharge port.

[0015] Preferably, a discharge chute is connected to one end of the discharge port. A low-position stop is provided on the discharge chute. In the initial state, the low-position stop protrudes from the inner wall of the discharge chute to block a single round pipe. A drain outlet is provided on the side end of the discharge chute at the low-position stop. When a single round pipe comes into contact with the low-position stop, the high-pressure liquid remaining in the round pipe leaks down along the drain outlet. When more than one round pipe comes into contact with the low-position stop, the rear round pipe passes over the low-position stop and slides out along the discharge chute.

[0016] Preferably, the low-position stop is elastically connected to the discharge slide.

[0017] The beneficial effects of this invention are as follows: A main cylinder mounted on a base is connected to a slider at its output end, and an upper mold is connected to the bottom end of the slider. A material tray is rotatably connected to the worktable. A lower mold is located at one end of the material tray, and a loading section for holding round tubes is located above the other end. When the horizontal push cylinder extends the abutment cylinder, the abutment cylinder presses against the end of the round tube on the lower mold. Then, the main cylinder drives the slider to move downwards, and the upper and lower molds clamp the round tube. A high-pressure liquid is injected into the round tube through an injection hole connected to a hydraulic system, thus using the hollow round tube as the raw material. Liquid pressure is applied inside the tube cavity, and an axial load is applied to the cylinder, causing the round tube to deform within a given mold cavity until it is completely attached to the inner walls of the upper and lower molds, i.e., the tube wall is in contact with the inner surface of the mold, thus obtaining a mechanical spring of the desired shape. This completes the high-pressure forming process, which is simple. After high-pressure forming, the round tube is heavier due to the residual high-pressure liquid inside. The pressure plate rotates, causing the other end of the plate to tilt up to receive the round tube exiting from the feeding section, achieving automatic feeding and demolding. The operation is simple and suitable for continuous and efficient batch production. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the material tray of the present invention;

[0021] Figure 3 This is a schematic diagram of the upper mold in its initial state in this invention;

[0022] Figure 4 This is a schematic diagram of the leakage port structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the upper and lower molds of the present invention when they cover and clamp the round tube.

[0024] Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle;

[0025] Figure 7 This is a schematic diagram of the structure of the high-pressure formed round tube being transferred into the unloading groove for unloading according to the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the material tray during rebalancing according to the present invention;

[0027] Figure 9 For the present invention Figure 8 Enlarged view of point B in the middle;

[0028] Figure 10 This is a schematic diagram of the structure of the material tray of the present invention when it returns to a horizontal state;

[0029] Figure 11 This is a schematic diagram of the conveyor belt structure of the present invention;

[0030] Figure 12 This is a schematic diagram of the horizontal push cylinder of the present invention.

[0031] The diagram is marked as follows:

[0032] 1. Base; 2. Workbench; 3. Main cylinder; 4. Slider; 5. Upper mold; 6. Material tray; 61. Slide rail; 7. Lower mold; 8. Round tube fitting; 9. Loading section; 91. Material cylinder; 92. Flip plate; 93. Electromagnetic block; 10. Horizontal push cylinder; 11. Abutment cylinder; 12. Injection hole; 13. Hydraulic system; 14. Column; 15. Discharge chute; 151. Discharge port; 152. Discharge slide rail; 153. Drain outlet; 16. Fixed platform; 17. Loading position; 171. High stop block; 172. Low stop block; 18. Conveyor belt; 19. Power supply section; 20. Push button switch; 21. Abutment rod; 22. Low position stop block. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0034] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] like Figure 1 , Figure 2, Figure 5 , Figure 12 As shown, a mechanical spring internal high-pressure forming hydraulic press includes a base 1, a worktable 2 on the base 1, and a main cylinder 3 mounted on the base 1. A slider 4 is connected to the output end of the main cylinder 3, and an upper mold 5 is connected to the bottom end of the slider 4. A material tray 6 is rotatably connected to the worktable 2. A lower mold 7 is located at one end of the material tray 6, and a feeding part 9 for holding a round tube 8 is located above the other end. The main cylinder 3 drives the slider 4 to move downwards, and the upper mold 5 and lower mold 7 clamp the round tube 8. Horizontal push cylinders 10 are symmetrically arranged on both sides of the worktable 2. A push cylinder 11 is connected to the output end of the horizontal push cylinder 10. The end of the push cylinder 11 is provided with a liquid injection hole 12. When the horizontal push cylinder 10 drives the push cylinder 11 to extend, the push cylinder 11 presses against the end of the round tube 8 on the lower mold 7. The liquid injection hole 12 injects high pressure liquid into the round tube 8. The high pressure liquid pushes the round tube 8 to deform until the round tube 8 is completely attached to the inner side wall of the upper mold 5 and the lower mold 7. The round tube 8 after high pressure forming presses against the rotating material plate 6 so that the other end of the material plate 6 is raised to receive the round tube 8 discharged from the loading part 9.

[0036] The present invention includes a worktable 2 mounted on a base 1, and a main cylinder 3 mounted on the base 1. A slider 4 is connected to the output end of the main cylinder 3, and an upper mold 5 is connected to the bottom end of the slider 4. A material tray 6 is rotatably connected to the worktable 2. A lower mold 7 is mounted on one end of the material tray 6, and a feeding part 9 for holding a round tube 8 is located above the other end. Horizontal push cylinders 10 are symmetrically arranged on both sides of the worktable 2. A stop cylinder 11 is connected to the output end of the horizontal push cylinder 10, and an injection hole 12 is opened at the end of the stop cylinder 11. A hydraulic system 13 is also provided on the base 1. When the horizontal push cylinder 10 drives the stop cylinder 11 to extend, the stop cylinder 11 presses against the end of the round tube 8 on the lower mold 7. Then, the main cylinder 3 drives the slider 4 to move downward, and the upper mold 5 and lower mold 7 clamp the round tube 8. The injection hole 12 is connected to the hydraulic system 13, and the injection is directed to the round tube. High-pressure liquid is injected into the cavity of the hollow cylindrical tube 8 as the raw material. The high-pressure liquid applies liquid pressure to the cavity and the abutment cylinder 11 applies axial load, causing the cylindrical tube 8 to deform within the given mold cavity until the cylindrical tube 8 is completely attached to the inner wall of the upper mold 5 and the lower mold 7, that is, the tube wall is attached to the inner surface of the mold, thus obtaining the mechanical spring of the required shape and completing the high-pressure forming. The process is simple. After the high-pressure forming, the cylindrical tube 8 becomes heavier due to the residual high-pressure liquid. After the slider 4 drives the upper mold 5 to detach from the cylindrical tube 8 and the abutment cylinders 11 at both ends move away from the cylindrical tube 8, the high-pressure formed cylindrical tube 8 presses against the rotating material tray 6, causing the other end of the material tray 6 to tilt up to receive the cylindrical tube 8 discharged from the feeding part 9, realizing automatic feeding and demolding. The operation is simple and suitable for continuous and efficient batch production.

[0037] In embodiments of the present invention, such as Figure 1As shown, a plurality of columns 14 are erected on the top of the base 1. The top of the columns 14 are fixedly connected to the main cylinder 3. The slider 4 has through holes for the columns 14 to pass through, so that the slider 4 can slide freely up and down along the columns 14. Thus, the columns 14 can stably support the main cylinder 3 while also stabilizing and guiding the slider 4 to slide up and down.

[0038] In embodiments of the present invention, such as Figure 2 As shown, a material feeding groove 15 is recessed at one end of the worktable 2. The material feeding groove 15 is located below the lower mold 7. A fixed platform 16 is provided on the side of the material feeding groove 15. In the initial state, the material tray 6 is horizontal, and the end of the material tray 6 away from the material feeding groove 15 abuts against the fixed platform 16.

[0039] The material tray 6 is provided with a slide rail 61 for the round tube 8 to slide along the slide rail 61. The lower mold 7 is located at one end of the slide rail 61. The lower mold 7 is designed to be a groove that covers the lower part of the round tube 8. Preferably, the lower mold 7 is lower than the slide rail 61, which facilitates the efficient falling of the round tube 8 into the lower mold 7. Figure 3 As shown, the upper mold 5 is designed in two sections, left and right, with each section rotatably connected to the bottom of the slider 4. A push cylinder connects the upper mold 5 and the bottom of the slider 4. In the initial state, the push cylinder causes the two sections of the upper mold 5 to separate, as shown. Figure 5 , Figure 6 As shown, when the slider 4 moves down, it pushes the two upper molds 5 together with the lower mold 7 to cover and clamp the round tube 8.

[0040] A loading position 17 is provided at the end of the slide rail 61 away from the lower mold 7. A high stop block 171 is provided at the end of the loading position 17 away from the lower mold 7, and a low stop block 172 is provided at the end of the loading position 17 close to the lower mold 7. Both the low stop block 172 and the high stop block 171 protrude from the slide rail 61, and their heights are respectively located at the low and high positions on the slide rail 61. Thus, the high stop block 171 is used to prevent the round tube 8 from falling off the material tray 6, and the low stop block 172 is used to position the round tube 8. When multiple round tubes 8 are squeezed into the loading position 17, the bottom round tube 8 can pass over the low stop block 172.

[0041] The round tube blanks 8 from the same batch have the same specifications. After high-pressure forming, some high-pressure liquid will inevitably remain inside the round tube 8, thus its weight will be greater than that of the other end of the round tube 8, thereby forcing the material tray 6 to rotate. Figure 7 As shown, the high-pressure formed round tube 8 is transferred to the unloading trough 15 for unloading. The other end of the material tray 6 is raised, and the round tube 8 discharged from the loading part 9 falls to the upper material position 17, hitting the initial round tube 8 on the upper material position 17, as shown. Figure 8 As shown, the initial round tube 8 passes over the low stop 172 and moves onto the lower mold 7, thereby causing the round tubes 8 at both ends to re-drive the material tray 6 to rotate and achieve balance. Figure 10As shown, the material tray 6 returns to a horizontal state, realizing automatic feeding and demolding after preparation.

[0042] The feeding section 9 includes a material cylinder 91, inside which multiple round tubes 8 are vertically stacked. Flip plates 92 are rotatably connected to both sides of the bottom end of the material cylinder 91. Initially, the flip plates 92 rotate to close, supporting the bottommost round tube 8 for material stacking. When one end of the material tray 6 rotates and tilts upwards, it triggers the flip plates 92 to rotate and separate, allowing the bottommost round tube 8 to fall to the upper material position 17, completing the feeding. However, it is inevitable that a small number of blanks in the same batch will have slight discrepancies in size and weight. If the fed round tube 8 is too heavy, it can fall to the upper material position 17 and cause the material tray 6 to rotate for balance. However, this discrepancy will occur after the next batch of blanks is completed. If the round tube 8 on position 17 is too heavy, it will always press against the end of the material tray 6 located above the fixed platform 16, preventing the material tray 6 from rotating and tilting. This will cause the production process to pause, making it easier for the staff to notice in time. If the round tube 8 on the feeding position is too light, when the round tube 8 falls onto the feeding position 17, the initial round tube 8 will pass over the low stop 172 and move onto the lower mold 7. However, since the round tube 8 on the feeding position 17 is too light, it is not enough to drive the material tray 6 to rotate in balance. As a result, the material tray 6 will always be tilted at one end, and the production process will also pause, making it easier for the staff to notice in time. Thus, while automatically feeding and demolding, it can automatically identify feeding that is too heavy or too light.

[0043] In embodiments of the present invention, such as Figure 11 As shown, the top of the barrel 91 is designed to be open, and a conveyor belt 18 is provided on one side of the top of the barrel 91 for conveying the round tube 8 into the barrel 91.

[0044] A torsion spring is provided at the bottom of the material cylinder 91 where it is rotatably connected to the flap 92, which is used to drive the flaps 92 on both sides to rotate and close. At the same time, an electromagnetic block 93 is provided at the bottom of the flap 92. A power supply unit 19 is connected to the side of the material cylinder 91. The power supply unit 19 and the electromagnetic block 93 are electrically connected to provide power to the electromagnetic block 93. In the initial state, the weight of the material pushed in the material cylinder 91 is not enough to resist the force of the torsion spring and the electromagnetic block 93, and the flap 92 remains closed.

[0045] A push-button switch 20 is provided at the bottom of the power supply unit 19. A stop rod 21 is connected to one end of the material tray 6. When one end of the material tray 6 rotates and tilts up, the stop rod 21 rotates and pushes the push-button switch 20, triggering the power supply unit 19 to cut off the power. The electromagnetic block 93 loses its attraction. At this time, the material pile in the material cylinder 91 is sufficient to counteract the torsion spring, causing the flap 92 to rotate and separate. The bottommost round tube 8 in the material cylinder 91 falls to the upward material position 17 and drives the material tray 6 to rotate in balance. The stop rod 21 then moves away from the push-button switch 20. The power supply unit 19 powers the electromagnetic block 93 to work. The force of the torsion spring and the electromagnetic block 93 causes the flap 92 to rotate and close again, restoring the initial state. Of course, the triggering method can also be to use the position sensor in the prior art to sense when one end of the material tray 6 rotates and tilts up, triggering the power cut-off.

[0046] If there is too little material in the cylindrical tube 8 inside the material cylinder 91, even if the attraction of the electromagnetic block 93 is lost, the material inside the material cylinder 91 will not be enough to counteract the torsion spring, so no material will be fed into the cylindrical tube 8, making it easy for the staff to find and adjust in time. Excessive material can overflow from the top opening of the material cylinder 91. The overflowing cylindrical tube 8 will temporarily accumulate in the side plate next to the material cylinder 91, or the attraction of the electromagnetic block 93 can be increased so that it will not directly push open the flap 92.

[0047] In an embodiment of the present invention, a discharge port 151 is provided on the side end of the feeding groove 15. The size of the discharge port 151 is adapted to the high pressure formed round tube 8. When the high pressure formed round tube 8 is rotated into the feeding groove 15, it is discharged through the discharge port 151. Since the length of the multi-pleated mechanical spring is shorter than that of the round tube blank after it is formed, even if the blank round tube 8 falls towards the discharge port 151, it will not fall out of the discharge port 151.

[0048] like Figure 4 , Figure 8 , Figure 9As shown, one end of the discharge port 151 is connected to a discharge slide 152. A low-position stop 22 is provided on the discharge slide 152. In the initial state, the low-position stop 22 protrudes from the inner wall of the discharge slide 152 and is not very high, serving to abut and block a single round tube 8. A drain outlet 153 is provided on the side end of the discharge slide 152 at the low-position stop 22. Thus, after a mechanical spring is manufactured, it falls along the discharge port 151 into the discharge slide 152 and is blocked and limited by the low-position stop 22. The discharge slide 152 is designed to be inclined along its width, and the drain outlet 153 is located on the inclined surface. On the downward side, when a single round tube 8 comes into contact with the low-position stop 22, the high-pressure liquid remaining inside the round tube 8 leaks down along the drain port 153 and is recovered. This continues until more than one round tube 8 comes into contact with the low-position stop 22, that is, when the next round tube 8 is completed and falls into the discharge slide 152, the rear round tube 8 is impacted and gravity causes it to pass over the low-position stop 22 and slide out along the discharge slide 152. The front round tube 8 continues to come into contact with the low-position stop 22 for limitation and leaks liquid for recovery. This continues until the next round tube 8 falls, and the cycle of sequential discharge and leakage recovery is completed.

[0049] Preferably, the low-position stop 22 is elastically connected to the discharge slide 152. In the initial state, the low-position stop 22 pops up to abut against a single round tube 8 for limiting, until multiple round tubes 8 fall into place, press down the low-position stop 22, pass over the low-position stop 22, and discharge along the end of the discharge slide 152. Specifically, the end of the discharge slide 152 may be provided with an inward collecting slide for collecting the prepared mechanical spring. The low-position stop 172 may also have the same elastic connection design.

[0050] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0051] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A hydraulic press for high-pressure forming of mechanical springs, comprising a base (1), wherein a worktable (2) is provided on the base (1), characterized in that, Also includes: The main cylinder (3) is mounted on the base (1). The output end of the main cylinder (3) is connected to a slider (4), and the bottom end of the slider (4) is connected to an upper mold (5). The material tray (6) is rotatably connected to the workbench (2). One end of the material tray (6) is provided with a lower mold (7), and the other end is provided with an upper part (9) for holding the round tube (8). The main cylinder (3) drives the slider (4) to move down, and the upper mold (5) and the lower mold (7) clamp the round tube (8). A horizontal push cylinder (10) is symmetrically arranged on both sides of the workbench (2). A push cylinder (11) is connected to the output end of the horizontal push cylinder (10). A liquid injection hole (12) is opened at the end of the push cylinder (11). When the horizontal push cylinder (10) drives the push cylinder (11) to extend, the push cylinder (11) presses against the end of the round tube (8) on the lower mold (7). The liquid injection hole (12) injects high pressure liquid into the round tube (8). The high pressure liquid pushes the round tube (8) to deform until the round tube (8) is completely attached to the inner sidewall of the upper mold (5) and the lower mold (7). The high pressure formed round tube (8) presses against the material tray (6) to rotate, so that the other end of the material tray (6) is raised to receive the round tube (8) discharged from the upper part (9). The workbench (2) has a recessed material feeding groove (15) at one end, which is located below the lower mold (7). A fixed platform (16) is provided on the side of the material feeding groove (15). In the initial state, the material tray (6) is horizontal, and the end of the material tray (6) away from the material feeding groove (15) abuts against the fixed platform (16). The material tray (6) is provided with a slide rail (61), and the lower mold (7) is located at one end of the slide rail (61). The lower mold (7) is designed in the shape of a groove covering the lower part of the round tube (8). The slide rail (61) is provided with a loading position (17) at the end away from the lower mold (7). The loading position (17) is provided with a high stop (171) at the end away from the lower mold (7), and a low stop (172) at the end of the loading position (17) close to the lower mold (7). The round tube (8) after high pressure forming has residual high pressure liquid, and its weight is greater than The other end of the round tube (8) causes the material tray (6) to rotate. The high-pressure formed round tube (8) rotates into the unloading groove (15) for unloading. The other end of the material tray (6) is raised. The round tube (8) discharged from the loading part (9) falls to the loading position (17), pushing the round tube (8) on the loading position (17) so that the round tube (8) on the loading position (17) passes over the low stop (172) and moves to the lower mold (7). The round tubes (8) at both ends drive the material tray (6) to rotate, and the material tray (6) returns to a horizontal state.

2. The hydraulic press for high-pressure forming of mechanical springs according to claim 1, characterized in that, The base (1) has multiple columns (14) erected at its top. The top of each column (14) is fixedly connected to the main cylinder (3). The slider (4) has a through hole for the column (14) to pass through, so that the slider (4) can slide freely up and down along the column (14).

3. The hydraulic press for high-pressure forming of mechanical springs according to claim 1, characterized in that, The feeding section (9) includes a material cylinder (91), in which multiple round tubes (8) are stacked vertically. Flip plates (92) are rotatably connected to both sides of the bottom end of the material cylinder (91). In the initial state, the flip plates (92) rotate to close and support the bottommost round tube (8). When one end of the material tray (6) rotates and tilts up, it triggers the flip plates (92) on both sides to rotate and separate, so that the bottommost round tube (8) falls to the upper material position (17).

4. A mechanical spring internal high-pressure forming hydraulic press according to claim 3, characterized in that, The top of the barrel (91) is open, and a conveyor belt (18) is provided on one side of the top of the barrel (91) for conveying the round tube (8) into the barrel (91).

5. A mechanical spring internal high-pressure forming hydraulic press according to claim 3, characterized in that, A torsion spring is provided at the bottom of the material cylinder (91) where it is rotatably connected to the flap (92) to drive the flaps (92) on both sides to rotate and close. An electromagnetic block (93) is provided at the bottom of the flap (92). A power supply unit (19) is connected to the side of the material cylinder (91). The power supply unit (19) and the electromagnetic block (93) are electrically connected. A push button switch (20) is provided at the bottom of the power supply unit (19). A stop rod (21) is connected to one end of the material tray (6). When one end of the material tray (6) rotates and tilts up, the stop rod (21) rotates and pushes against the push button switch (20), triggering the power supply unit (19) to cut off the power.

6. A mechanical spring internal high-pressure forming hydraulic press according to claim 1, characterized in that, The side end of the feeding groove (15) is provided with a discharge port (151). The size of the discharge port (151) is adapted to the high pressure formed round tube (8). When the high pressure formed round tube (8) is transferred into the feeding groove (15), it is discharged through the discharge port (151).

7. A mechanical spring internal high-pressure forming hydraulic press according to claim 6, characterized in that, One end of the discharge port (151) is connected to the discharge slide (152). The discharge slide (152) is provided with a low-position stop (22). In the initial state, the low-position stop (22) protrudes from the inner wall of the discharge slide (152) and is used to block a single round pipe (8). The side end of the discharge slide (152) located at the low-position stop (22) is provided with a leakage port (153). When a single round pipe (8) abuts against the low-position stop (22), the high-pressure liquid remaining in the round pipe (8) leaks down along the leakage port (153) until more than one round pipe (8) abuts against the low-position stop (22). The rear end of the round pipe (8) passes over the low-position stop (22) and slides out along the discharge slide (152).

8. A mechanical spring internal high-pressure forming hydraulic press according to claim 7, characterized in that, The low-position stop (22) is elastically connected to the discharge chute (152).

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