Double-closed-loop energy-saving servo press hydraulic regulation and control equipment

Abstract

The utility model relates to the technical field of servo presses, in particular to a double-closed-loop energy-saving hydraulic regulation and control device for a servo press, which is characterized in that a variable-diameter hydraulic component is combined with a servo electric cylinder to apply larger pressure to a workpiece, so that the punching effect is improved; comprising a base, a plurality of stand columns, a top plate and a servo push cylinder assembly. The sliding table is slidably mounted in the middles of the multiple stand columns, the variable-diameter hydraulic cylinder is mounted in the middle of the sliding table, the diameter of the upper portion of the variable-diameter hydraulic cylinder is smaller than that of the lower portion of the variable-diameter hydraulic cylinder, the upper piston assembly is slidably mounted in the upper portion of the variable-diameter hydraulic cylinder, and the lower piston assembly is mounted in the lower portion of the variable-diameter hydraulic cylinder. The upper piston assembly is connected with the output end of the servo push cylinder assembly, the lower piston assembly is slidably installed in the lower portion of the variable-diameter hydraulic cylinder, the two ends of the first oil pipe are connected with the upper end of the variable-diameter hydraulic cylinder and one end of the valve respectively, and the two ends of the second oil pipe are connected with the lower end of the variable-diameter hydraulic cylinder and the other end of the valve respectively.

Description

Technical Field

[0001] This utility model relates to the technical field of servo presses, and in particular to a hydraulic control device for a double-closed-loop energy-type servo press. Background Technology

[0002] Servo presses are presses driven and controlled by servo motors, and are widely used in processes such as stamping, forging, press fitting, and straightening. Chinese utility model patent CN218785536U discloses a servo press that places a pressure sensor at the output end of the servo motor module. When the press head applies pressure to the workpiece, the pressure sensor can obtain the pressure signal in real time. After the pressure signal is transmitted to the control module, the control module can accurately determine whether the pressure applied to the workpiece has reached the preset value, thereby precisely controlling the amount of pressure applied to the workpiece and improving the accuracy of workpiece press fitting.

[0003] However, the existing servo presses directly use servo electric cylinder modules to drive the press head to stamp the workpiece. Since the pressure generated by the servo electric cylinder module is limited, the stamping force on the workpiece is relatively low. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a hydraulic control device for a double-closed-loop energy-type servo press that applies greater pressure to the workpiece and improves the stamping effect by combining a variable-diameter hydraulic component with a servo electric cylinder.

[0005] This utility model discloses a hydraulic control device for a double-closed-loop energy-type servo press, comprising a base, multiple columns, a top plate, and a servo pusher cylinder assembly. The multiple columns are vertically mounted on the base, and the top plate is horizontally mounted on top of the multiple columns. The servo pusher cylinder assembly is mounted on the top plate. It also includes a slide, a variable-diameter hydraulic cylinder, an upper piston assembly, a lower piston assembly, oil pipe one, oil pipe two, and valves. The slide is slidably mounted in the middle of the multiple columns, and the variable-diameter hydraulic cylinder is mounted in the middle of the slide. Hydraulic oil is added to the variable-diameter hydraulic cylinder, and the upper diameter of the variable-diameter hydraulic cylinder is smaller than its lower diameter. The piston of the upper piston assembly is slidably mounted in the upper part of the variable diameter hydraulic cylinder. The upper end of the piston rod of the upper piston assembly is connected to the output end of the servo push cylinder assembly. The lower piston assembly is slidably mounted in the lower part of the variable diameter hydraulic cylinder. A pressure sensor and pressure head are installed at the lower end of the piston rod of the lower piston assembly. One end of oil pipe one is connected to the upper end of the variable diameter hydraulic cylinder, and the other end of oil pipe one is connected to one end of the valve. One end of oil pipe two is connected to the lower end of the variable diameter hydraulic cylinder, and the other end of oil pipe two is connected to the other end of the valve. The valve is mounted on the slide table via a bracket. (The last sentence appears to be unrelated and refers to a stamping die.) Mounted on a base, the pressure head is installed on the lower end of the piston rod of the lower piston assembly. During operation, the workpiece is placed on the lower die. At the start of operation, the upper piston assembly is raised to the top of the upper part of the variable diameter hydraulic cylinder, and the lower piston assembly is raised to the top of the lower part of the variable diameter hydraulic cylinder. The output end of the servo push cylinder assembly retracts to the high position, the valve closes, and the output end of the servo push cylinder assembly extends downward. Because the valve is closed, the upper and lower piston assemblies are kept in their initial positions in the variable diameter hydraulic cylinder. When the distance between the pressure head at the lower end of the lower piston assembly and the workpiece reaches a set value, the valve opens. At this time, the upper piston assembly moves downward from the top of the upper part of the variable diameter hydraulic cylinder under the pressure of the servo push cylinder assembly. The upper piston assembly pushes the hydraulic oil downward, and the hydraulic oil pushes the lower piston assembly downward. During this process, the hydraulic oil below the lower piston assembly flows into the upper piston assembly through oil pipe 2, the valve, and oil pipe 1. Because the lower diameter of the variable diameter hydraulic cylinder is larger than the upper diameter, the output pressure of the servo push cylinder assembly is amplified, thereby allowing the pressure head at the lower end of the lower piston assembly to apply greater pressure to the workpiece, improving the stamping effect.

[0006] Preferably, the assembly also includes oil pipe three, hydraulic rod one, mounting clamp one, oil pipe four, hydraulic rod two, and mounting clamp two. The valve's input shaft is driven by a hydraulic motor. One end of oil pipe three is connected to one end of the hydraulic motor, and the other end of oil pipe three is connected to hydraulic rod one. Hydraulic rod one is mounted on a column via mounting clamp one, with the lower end of the piston rod of hydraulic rod one facing the slide table. One end of oil pipe four is connected to the other end of the hydraulic motor, and the other end of oil pipe four is connected to hydraulic rod two. Hydraulic rod two is mounted on a column via mounting clamp two, with the upper end of the piston rod of hydraulic rod two facing the slide table. Hydraulic oil is added to hydraulic rod one and hydraulic rod two. When the slide table descends and compresses the piston rod of hydraulic rod two, the hydraulic oil in hydraulic rod two drives the valve through oil pipe four. The hydraulic motor rotates, causing it to open the valve. At this time, the upper and lower piston assemblies begin to descend relative to the variable-diameter hydraulic cylinder to perform high-pressure stamping on the workpiece. After the workpiece stamping is completed, the output end of the servo push cylinder assembly retracts, pushing the mounting clamp two upward relative to the variable-diameter hydraulic cylinder. This causes the hydraulic oil in the upper part of the mounting clamp two to flow into the lower part of the variable-diameter hydraulic cylinder through oil pipe one, the valve, and oil pipe two, pushing the lower piston assembly upward. Simultaneously, the mounting clamp two drives the variable-diameter hydraulic cylinder and the slide table to rise. When the slide table rises and compresses the piston rod of hydraulic rod one, the hydraulic oil in hydraulic rod one drives the hydraulic motor of the valve to rotate through oil pipe three, causing the hydraulic motor to close the valve, thus achieving mechanical control of the valve with good reliability.

[0007] Preferably, it also includes two bolts, which are respectively rotatably screwed onto mounting hoop one and mounting hoop two, with the inner ends of both bolts contacting the column; by adjusting the position of mounting hoop one and mounting hoop two along the column and tightening the two bolts to position mounting hoop one and mounting hoop two, the position of hydraulic rod one and hydraulic rod two can be adjusted, thereby adjusting the opening and closing position of the valve, adapting to workpieces of different heights, and having good versatility.

[0008] Preferably, it also includes a positioning sleeve, which is fitted onto the column and located below the slide. The positioning sleeve supports the slide, at which point the slide and the variable diameter hydraulic cylinder stop, and the output end of the servo push cylinder assembly continues to extend downward, thereby causing the upper piston assembly to push the lower piston assembly down through hydraulic oil to stamp the workpiece, making the stamping effect more stable.

[0009] Preferably, the servo cylinder pusher assembly includes a servo motor, a drive screw, an internally threaded tube, and a sleeve. The servo motor is mounted in the middle of the upper end face of the top plate. The upper end of the drive screw is concentrically connected to the output shaft of the servo motor. The internally threaded tube is threadedly connected to the drive screw through a central threaded hole. The internally threaded tube is inserted into the sleeve. The lower end of the internally threaded tube is connected to the upper end of the piston rod of the upper piston assembly. The upper end of the sleeve is mounted on the top plate. The servo motor drives the drive screw to rotate. The drive screw and the internally threaded tube are threaded together, thereby driving the internally threaded tube to rise and fall along the sleeve, which in turn causes the internally threaded tube to drive the upper piston assembly to rise and fall. This technology is mature and reliable.

[0010] Preferably, it also includes a scale and a measuring head. The lower end of the scale is connected to the lower end of the internally threaded tube, and the measuring head is installed on the lower end of the outer wall of the sleeve. The measuring head and the scale work together to detect the expansion and contraction of the internally threaded tube. When the internally threaded tube expands and contracts along the sleeve, the scale moves up and down relative to the measuring head. The measuring head identifies the scale of the scale, thereby measuring the expansion and contraction of the internally threaded tube. The operating status of the servo motor is controlled by the measured value of the expansion and contraction, thereby improving the degree of automation.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The lower stamping die is installed on the base, and the pressure head is installed on the lower end of the piston rod of the lower piston assembly. During operation, the workpiece is placed on the lower die. When starting work, the upper piston assembly is raised to the top of the upper part of the variable diameter hydraulic cylinder, and the lower piston assembly is raised to the top of the lower part of the variable diameter hydraulic cylinder. The output end of the servo push cylinder assembly retracts to the high position, the valve is closed, and the output end of the servo push cylinder assembly extends downward. Because the valve is closed, the upper piston assembly and the lower piston assembly are kept in the initial position in the variable diameter hydraulic cylinder. When the pressure head at the lower end of the lower piston assembly is pressed against the workpiece... When the distance between the parts reaches the set value, the valve opens. At this time, the upper piston assembly moves downward from the top of the variable diameter hydraulic cylinder under the pressure of the servo push cylinder assembly. The upper piston assembly pushes the hydraulic oil downward, and the hydraulic oil pushes the lower piston assembly downward. During this process, the hydraulic oil below the lower piston assembly flows into the upper piston assembly through oil pipe 2, the valve, and oil pipe 1. Since the lower diameter of the variable diameter hydraulic cylinder is larger than the upper diameter, the output pressure of the servo push cylinder assembly is amplified, thereby allowing the pressure head at the lower end of the lower piston assembly to apply greater pressure to the workpiece and improve the stamping effect. Attached Figure Description

[0012] Figure 1 This is a front sectional view of the present invention;

[0013] Figure 2 This is an axonometric structural diagram of the utility model;

[0014] Figure 3 It is a partial cross-sectional structural diagram of the variable diameter hydraulic cylinder, upper piston assembly, lower piston assembly, valve, hydraulic rod one and hydraulic rod two, etc.

[0015] Figure 4 This is a front section diagram of the servo cylinder pusher assembly;

[0016] Figure 5 This is a structural diagram of the disassembled state of the servo push cylinder assembly.

[0017] The following components are labeled in the attached diagram: 1. Base; 2. Column; 3. Top plate; 4. Servo push cylinder assembly; 5. Slide table; 6. Variable diameter hydraulic cylinder; 7. Upper piston assembly; 8. Lower piston assembly; 9. Oil pipe one; 10. Oil pipe two; 11. Valve; 12. Oil pipe three; 13. Hydraulic rod one; 14. Mounting clamp one; 15. Oil pipe four; 16. Hydraulic rod two; 17. Mounting clamp two; 18. Bolt; 19. Positioning sleeve; 20. Servo motor; 21. Drive screw; 22. Internally threaded pipe; 23. Sleeve; 24. Scale; 25. Measuring head. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0019] Example 1

[0020] like Figures 1 to 3As shown, a double-closed-loop energy-saving servo press hydraulic control device includes a base 1, multiple columns 2, a top plate 3, and a servo push cylinder assembly 4. The multiple columns 2 are vertically mounted on the base 1, the top plate 3 is horizontally mounted on the top of the multiple columns 2, and the servo push cylinder assembly 4 is mounted on the top plate 3. It also includes a slide table 5, a variable-diameter hydraulic cylinder 6, an upper piston assembly 7, a lower piston assembly 8, a first oil pipe 9, a second oil pipe 10, and a valve 11. The slide table 5 is slidably mounted in the middle of the multiple columns 2, and the variable-diameter hydraulic cylinder 6 is mounted in the middle of the slide table 5. Hydraulic pressure is injected into the variable-diameter hydraulic cylinder 6. The upper diameter of the variable-diameter hydraulic cylinder 6 is smaller than its lower diameter. The piston of the upper piston assembly 7 is slidably mounted in the upper part of the variable-diameter hydraulic cylinder 6. The upper end of the piston rod of the upper piston assembly 7 is connected to the output end of the servo push cylinder assembly 4. The lower piston assembly 8 is slidably mounted in the lower part of the variable-diameter hydraulic cylinder 6. A pressure sensor and a pressure head are installed at the lower end of the piston rod of the lower piston assembly 8. One end of oil pipe 19 is connected to the upper end of the variable-diameter hydraulic cylinder 6, and the other end of oil pipe 19 is connected to one end of valve 11. One end of oil pipe 210 is connected to the lower end of the variable-diameter hydraulic cylinder 6. The other end of 0 is connected to the other end of valve 11, which is mounted on slide 5 via a bracket; it also includes oil pipe three 12, hydraulic rod one 13, mounting clamp one 14, oil pipe four 15, hydraulic rod two 16, and mounting clamp two 17. The input shaft of valve 11 is driven by a hydraulic motor. One end of oil pipe three 12 is connected to one end of the hydraulic motor, and the other end of oil pipe three 12 is connected to hydraulic rod one 13. Hydraulic rod one 13 is mounted on column 2 via mounting clamp one 14. The lower end of the piston rod of hydraulic rod one 13 faces slide 5, and one end of oil pipe four 15 is connected to the... The other end of the hydraulic motor is connected to the other end of the oil pipe 15, which is connected to the hydraulic rod 16. The hydraulic rod 16 is mounted on the column 2 via the mounting clamp 17. The upper end of the piston rod of the hydraulic rod 16 faces the slide table 5. Hydraulic oil is added to the hydraulic rod 13 and the hydraulic rod 16. It also includes two bolts 18, which are respectively rotatably screwed onto the mounting clamp 14 and the mounting clamp 17. The inner ends of the two bolts 18 are in contact with the column 2. It also includes a positioning sleeve 19, which is fitted onto the column 2 and is located below the slide table 5.

[0021] Adjust the positions of mounting clamp 14 and mounting clamp 27 along column 2, tighten the two bolts 18 to position mounting clamp 14 and mounting clamp 27, thereby adjusting the positions of hydraulic rod 13 and hydraulic rod 26, and thus adjusting the opening and closing positions of valve 11 to accommodate workpieces of different heights. The lower stamping die is installed on base 1, and the press head is installed on the lower end of the piston rod of the lower piston assembly 8. During operation, the workpiece is placed on the lower die. At the start of operation, the upper piston assembly 7 is raised to the top of the upper part of the variable diameter hydraulic cylinder 6, and the lower piston assembly 8 is raised to the top of the lower part of the variable diameter hydraulic cylinder 6. The servo push cylinder assembly 4... When the output end retracts to the high position, valve 11 closes, and the output end of the servo push cylinder assembly 4 extends downward. Because valve 11 is closed, the upper piston assembly 7 and the lower piston assembly 8 remain in their initial positions within the variable-diameter hydraulic cylinder 6. When the slide table 5 descends and compresses the piston rod of hydraulic rod 16, the hydraulic oil in hydraulic rod 16 drives the hydraulic motor of valve 11 to rotate through oil pipe 15, causing the hydraulic motor to open valve 11. At this time, the upper piston assembly 7, under the pressure of the servo push cylinder assembly 4, moves downward from the top of the variable-diameter hydraulic cylinder 6. The upper piston assembly 7 pushes the hydraulic oil downward, and the hydraulic oil pushes the lower piston assembly... As part 8 is pushed downwards, hydraulic oil below the lower piston assembly 8 flows into the upper piston assembly 7 through oil pipe 10, valve 11, and oil pipe 9. Since the lower diameter of the variable-diameter hydraulic cylinder 6 is larger than its upper diameter, the output pressure of the servo push cylinder assembly 4 is amplified. Positioning sleeve 19 supports the slide 5, at which point the slide 5 and variable-diameter hydraulic cylinder 6 stop. The output end of the servo push cylinder assembly 4 continues to extend downwards, causing the upper piston assembly 7 to push the lower piston assembly 8 downwards via hydraulic oil to stamp the workpiece, resulting in a more stable stamping effect. The pressure head at the lower end of the lower piston assembly 8 applies greater pressure to the workpiece. After the workpiece is stamped, the output end of the servo push cylinder assembly 4 retracts, pushing the mounting clamp 2 17 upward relative to the variable diameter hydraulic cylinder 6. This causes the hydraulic oil in the upper part of the mounting clamp 2 17 to flow into the lower part of the variable diameter hydraulic cylinder 6 through the oil pipe 1 9, valve 11 and oil pipe 2 10, pushing the lower piston assembly 8 upward. At the same time, the mounting clamp 2 17 drives the variable diameter hydraulic cylinder 6 and the slide table 5 to rise. When the slide table 5 rises and compresses the piston rod of the hydraulic rod 13, the hydraulic oil in the hydraulic rod 13 drives the hydraulic motor of valve 11 to rotate through the oil pipe 3 12, causing the hydraulic motor to close valve 11, thus realizing the mechanical control of valve 11.

[0022] Example 2

[0023] like Figures 4 to 5As shown, based on Embodiment 1, the servo push cylinder assembly 4 includes a servo motor 20, a drive screw 21, an internally threaded tube 22, and a sleeve 23. The servo motor 20 is installed in the middle of the upper end face of the top plate 3. The upper end of the drive screw 21 is concentrically connected to the output shaft of the servo motor 20. The internally threaded tube 22 is threadedly connected to the drive screw 21 through a central threaded hole. The internally threaded tube 22 is inserted into the sleeve 23. The lower end of the internally threaded tube 22 is connected to the upper end of the piston rod of the upper piston assembly 7. The upper end of the sleeve 23 is installed on the top plate 3. It also includes a scale 24 and a measuring head 25. The lower end of the scale 24 is connected to the lower end of the internally threaded tube 22. The measuring head 25 is installed on the lower end of the outer wall of the sleeve 23. The measuring head 25 and the scale 24 cooperate to detect the extension and retraction of the internally threaded tube 22.

[0024] The servo motor 20 drives the drive screw 21 to rotate. The drive screw 21 engages with the internal threaded tube 22, thereby driving the internal threaded tube 22 to move up and down along the sleeve 23. This, in turn, causes the internal threaded tube 22 to move up and down along the sleeve 23. When the internal threaded tube 22 extends or retracts along the sleeve 23, the scale 24 moves up and down relative to the measuring head 25. The measuring head 25 identifies the scale of the scale 24, thereby measuring the extension or retraction of the internal threaded tube 22. The operating status of the servo motor 20 is controlled by measuring the extension or retraction, thus improving the degree of automation.

[0025] like Figures 1 to 5As shown, this utility model discloses a double-closed-loop energy-type servo press hydraulic control device. During operation, the lower die is first installed on the base 1, and the press head is installed on the lower end of the piston rod of the lower piston assembly 8. When working, the workpiece is placed on the lower die. At the start of operation, the upper piston assembly 7 is raised to the top of the upper part of the variable-diameter hydraulic cylinder 6, and the lower piston assembly 8 is raised to the top of the lower part of the variable-diameter hydraulic cylinder 6. The valve 11 is closed. Then, the servo motor 20 drives the drive screw 21 to rotate. The drive screw 21 engages with the internally threaded tube 22, thereby driving the internally threaded tube 22 along... As the sleeve 23 descends, the internal threaded pipe 22 pushes the upper piston assembly 7 downwards. Because valve 11 is closed, the upper piston assembly 7 and the lower piston assembly 8 remain in their initial positions within the variable-diameter hydraulic cylinder 6. Then, when the slide 5 descends and compresses the piston rod of the hydraulic rod 16, the hydraulic oil in the hydraulic rod 16 drives the hydraulic motor of valve 11 to rotate through the oil pipe 15. This causes the hydraulic motor to open valve 11, and the positioning sleeve 19 supports the slide 5. At this point, the slide 5 and the variable-diameter hydraulic cylinder 6 stop. The upper piston assembly 7 is then subjected to pressure from the servo push cylinder assembly 4. The top of the upper part of the variable diameter hydraulic cylinder 6 moves downward, and the upper piston assembly 7 pushes the hydraulic oil downward, which in turn pushes the lower piston assembly 8 downward. During this process, the hydraulic oil below the lower piston assembly 8 flows into the upper piston assembly 7 through oil pipe 10, valve 11, and oil pipe 9. Since the lower diameter of the variable diameter hydraulic cylinder 6 is larger than the upper diameter, the output pressure of the servo push cylinder assembly 4 is amplified, thereby applying greater pressure to the workpiece by the pressure head at the lower end of the lower piston assembly 8. The workpiece stamping is completed, and finally the internal threaded tube 22 retracts upward to install... The mounting clamp 17 pushes the variable diameter hydraulic cylinder 6 upward, causing the hydraulic oil on the upper part of the mounting clamp 17 to flow into the lower part of the variable diameter hydraulic cylinder 6 through oil pipe 9, valve 11 and oil pipe 10, pushing the lower piston assembly 8 upward. At the same time, the mounting clamp 17 drives the variable diameter hydraulic cylinder 6 and the slide table 5 to rise. When the slide table 5 rises and compresses the piston rod of the hydraulic rod 13, the hydraulic oil in the hydraulic rod 13 drives the hydraulic motor of valve 11 to rotate through oil pipe 12, causing the hydraulic motor to close valve 11. The above operation is repeated to stamp the next workpiece.

[0026] The main functions achieved by this utility model are:

[0027] 1. By combining the variable diameter hydraulic assembly with the servo electric cylinder, greater pressure is applied to the workpiece, improving the stamping effect;

[0028] 2. It can automatically and mechanically control the opening and closing of valve 11, with high reliability;

[0029] 3. By measuring the extension and retraction, the operation of the servo motor 20 is controlled, thereby improving the level of automation.

[0030] This utility model discloses a hydraulic control device for a double-closed-loop servo press. Its installation, connection, and setting methods are all common mechanical methods, and any method that achieves the desired beneficial effect can be implemented. The base 1, column 2, top plate 3, servo push cylinder assembly 4, slide table 5, variable diameter hydraulic cylinder 6, upper piston assembly 7, lower piston assembly 8, oil pipe 1 9, oil pipe 2 10, valve 11, oil pipe 3 12, hydraulic rod 1 13, oil pipe 4 15, hydraulic rod 2 16, servo motor 20, drive screw 21, internal threaded pipe 22, scale 24, and measuring head 25 of this utility model are commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative effort from those skilled in the art.

[0031] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hydraulic control device for a double-closed-loop servo press, comprising a base (1), multiple columns (2), a top plate (3), and a servo push cylinder assembly (4), wherein the multiple columns (2) are vertically mounted on the base (1), the top plate (3) is horizontally mounted on the top of the multiple columns (2), and the servo push cylinder assembly (4) is mounted on the top plate (3); characterized in that, It also includes a slide (5), a variable-diameter hydraulic cylinder (6), an upper piston assembly (7), a lower piston assembly (8), oil pipe one (9), oil pipe two (10), and a valve (11). The slide (5) is slidably installed in the middle of multiple columns (2). The variable-diameter hydraulic cylinder (6) is installed in the middle of the slide (5). Hydraulic oil is added to the variable-diameter hydraulic cylinder (6). The upper diameter of the variable-diameter hydraulic cylinder (6) is smaller than its lower diameter. The piston of the upper piston assembly (7) is slidably installed in the upper part of the variable-diameter hydraulic cylinder (6). The upper end of the piston rod of the upper piston assembly (7) is connected to the servo... The output end of the push cylinder assembly (4) is connected, and the lower piston assembly (8) is slidably installed in the lower part of the variable diameter hydraulic cylinder (6). The lower end of the piston rod of the lower piston assembly (8) is equipped with a pressure sensor and a pressure head. One end of the first oil pipe (9) is connected to the upper end of the variable diameter hydraulic cylinder (6), and the other end of the first oil pipe (9) is connected to one end of the valve (11). One end of the second oil pipe (10) is connected to the lower end of the variable diameter hydraulic cylinder (6), and the other end of the second oil pipe (10) is connected to the other end of the valve (11). The valve (11) is installed on the slide table (5) by a bracket.

2. The hydraulic control device for a dual-closed-loop energy-saving servo press as described in claim 1, characterized in that, It also includes oil pipe three (12), hydraulic rod one (13), mounting clamp one (14), oil pipe four (15), hydraulic rod two (16) and mounting clamp two (17). The input shaft of valve (11) is driven by a hydraulic motor. One end of oil pipe three (12) is connected to one end of the hydraulic motor, and the other end of oil pipe three (12) is connected to hydraulic rod one (13). Hydraulic rod one (13) is mounted on column (2) through mounting clamp one (14). The lower end of the piston rod of hydraulic rod one (13) faces the slide table (5). One end of oil pipe four (15) is connected to the other end of the hydraulic motor, and the other end of oil pipe four (15) is connected to hydraulic rod two (16). Hydraulic rod two (16) is mounted on column (2) through mounting clamp two (17). The upper end of the piston rod of hydraulic rod two (16) faces the slide table (5). Hydraulic oil is added to hydraulic rod one (13) and hydraulic rod two (16).

3. The hydraulic control device for a dual-closed-loop energy-saving servo press as described in claim 2, characterized in that, It also includes two bolts (18), which are rotatably screwed onto mounting hoop one (14) and mounting hoop two (17) respectively, and the inner ends of the two bolts (18) are in contact with the column (2).

4. The hydraulic control device for a dual-closed-loop energy-saving servo press as described in claim 2, characterized in that, It also includes a positioning sleeve (19), which is fitted onto the column (2) and located below the slide (5).

5. The hydraulic control device for a dual-closed-loop energy-type servo press as described in claim 2, characterized in that, The servo push cylinder assembly (4) includes a servo motor (20), a drive screw (21), an internal threaded tube (22), and a sleeve (23). The servo motor (20) is installed in the middle of the upper end face of the top plate (3). The upper end of the drive screw (21) is concentrically connected to the output shaft of the servo motor (20). The internal threaded tube (22) is threadedly connected to the drive screw (21) through the central threaded hole. The internal threaded tube (22) is inserted into the sleeve (23). The lower end of the internal threaded tube (22) is connected to the upper end of the piston rod of the upper piston assembly (7). The upper end of the sleeve (23) is installed on the top plate (3).

6. The hydraulic control device for a dual-closed-loop energy-saving servo press as described in claim 5, characterized in that, It also includes a scale (24) and a measuring head (25). The lower end of the scale (24) is connected to the lower end of the internally threaded tube (22). The measuring head (25) is installed on the lower end of the outer wall of the sleeve (23). The measuring head (25) and the scale (24) work together to detect the expansion and contraction of the internally threaded tube (22).

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