Ultrahigh-precision eight-axis hydraulic servo system

Abstract

The invention discloses an ultrahigh-precision eight-shaft hydraulic servo system, which relates to the technical field of bending machines, and comprises a large pump, a large servo motor, a small pump, a small pump servo motor, a pressure sensor, an integrated block, a prefill valve, a two-position three-way electromagnetic directional valve, a three-position four-way electromagnetic directional valve, a two-position four-way electromagnetic directional valve, an oil cylinder, a sliding block and a workbench, an oil suction port of the large pump is communicated with the oil tank through a pipeline, an oil outlet of the large pump is communicated with the integrated block, an oil suction port of the small pump is also communicated with the oil tank through a pipeline, an oil outlet of the small pump is communicated with the integrated block, a D port of the integrated block is connected with a lower cavity of the oil cylinder, and a U port of the integrated block is connected with an upper cavity of the oil cylinder; according to the system, the small-displacement servo pump set is additionally arranged, when the sliding block is close to the target value, the small-displacement servo pump set is switched to, accurate positioning of the sliding block is achieved through forward and reverse rotation of the servo motor, energy loss and the heating value of the system are reduced, and energy conservation and environment protection are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of bending machines, and in particular to an ultra-high precision eight-axis hydraulic servo system. Background Art

[0002] In the field of modern precision manufacturing and heavy processing, especially for the forming and bending operations of large and complex structural parts, the ultra-high precision eight-axis hydraulic servo system has become one of the indispensable core equipment.

[0003] At present, for most large-scale extra-long eight-cylinder bending machines and forming machines, the hydraulic control system is an electro-hydraulic proportional synchronous control system, or a multi-speed control method of servo motor + electro-hydraulic proportional valve. In essence, they are all based on the electro-hydraulic proportional control principle. For eight-axis synchronization, the electro-hydraulic proportional control system is difficult to control due to factors such as the interaction between the cylinder and the slider. The accuracy is poor, generally around ±0.1mm, and the system generates large heat and has high energy loss.

[0004] In addition, the bending head is prone to wear and tear after long-term use, and various tools are needed to replace it, which leads to a long replacement time and reduces the overall work efficiency.

[0005] In view of this, this application is hereby filed. Summary of the invention

[0006] The purpose of the present invention is to provide an ultra-high precision eight-axis hydraulic servo system to solve the problems raised in the above background technology.

[0007] To solve the above technical problems, the present invention provides an ultra-high precision eight-axis hydraulic servo system, comprising a large pump, a large servo motor, a small pump, a small pump servo motor, a pressure sensor, an integrated block, a filling valve, a two-position three-way electromagnetic reversing valve, a three-position four-way electromagnetic reversing valve, a two-position four-way electromagnetic reversing valve, an oil cylinder, a slider and a workbench. The oil suction port of the large pump is connected to the oil tank through a pipeline, and the oil outlet is connected to the integrated block. The oil suction port of the small pump is also connected to the oil tank through a pipeline, and the oil outlet is connected to the integrated block. The D port of the integrated block is connected to the lower cavity of the oil cylinder, the U port is connected to the upper cavity of the oil cylinder, and the F port is connected to the filling valve control port. The integrated block is composed of a large pump safety valve, a pressure sensor, a two-position three-way electromagnetic reversing valve, a three-position four-way electromagnetic reversing valve, a two-position four-way electromagnetic reversing valve, a back pressure valve, a quick-down ball valve, and a small pump safety valve.

[0008] Furthermore, the oil suction port of the large pump is connected to the main oil tank through a pipeline, and the oil outlet is connected to the large pump oil filter. The high-pressure oil is filtered by the large pump oil filter and connected to the oil inlet P1 of the integrated block. The oil suction port of the small pump is connected to the main oil tank through a pipeline, and the oil outlet is connected to the small pump oil filter. The high-pressure oil is filtered by the small pump oil filter and connected to the oil inlet P2 of the integrated block. The integrated block can be conveniently assembled with various valves using mounting screws, the working oil port D is connected to the lower chamber of the oil cylinder through an oil pipe, and the working oil port U is connected to the upper chamber of the oil cylinder through an oil pipe.

[0009] Furthermore, a rear support plate is fixedly installed on the top of the inner wall of the slider, a clamp is slidably installed on the side wall of the rear support plate, a front support plate is slidably installed on the side of the clamp away from the rear support plate, a connecting groove is opened on the inner wall of the clamp, a sliding column is slidably installed on the inner wall of the connecting groove, and a moving block is fixedly installed on the side wall of the sliding column.

[0010] Furthermore, a sliding groove is provided on the surface of the clamping plate, a connecting plate is slidably mounted on the inner wall of the sliding groove, and the connecting plate is fixedly mounted on the inner wall of the sliding column.

[0011] Furthermore, a threaded hole is provided on the inner wall of the moving block, a screw is threadedly connected to the inner wall of the threaded hole, and a second rotating column is fixedly installed on the end of the screw away from the moving block.

[0012] Furthermore, an L-shaped small connecting column and an L-shaped large connecting column are rotatably installed on the inner wall of the second rotating column, and a rotating column 1 is rotatably installed on one end of the L-shaped small connecting column and the L-shaped large connecting column away from the screw rod.

[0013] Furthermore, a bottom plate is rotatably mounted on an outer wall of the rotating column, a top of the bottom plate is fixedly mounted on a top of an inner wall of the sliding block, and a width of the bottom plate is smaller than a width of the sliding block.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. By adding a small-displacement servo pump group, when the slider approaches the target value, switch to the small-displacement servo pump group, and use the forward and reverse rotation of the servo motor to achieve precise positioning of the slider, reducing energy loss and system heat generation, and achieving energy saving and environmental protection; 2. The sliding connection between the slide and the connecting plate, and the design that the width of the bottom plate is smaller than the width of the slider, make it easy to replace the bending head and make maintenance more convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a circuit diagram of an ultra-high precision eight-axis hydraulic servo system; Figure 2 This is a working condition flow chart of an ultra-high precision eight-axis hydraulic servo system; Figure 3 This is a schematic diagram of the front structure of a slider of an ultra-high precision eight-axis hydraulic servo system; Figure 4 A schematic diagram of the internal structure of a slider of an ultra-high precision eight-axis hydraulic servo system; Figure 5 This is a schematic diagram of the exploded structure of the clamping mechanism of an ultra-high precision eight-axis hydraulic servo system.

[0016] In the figure: 1. Workbench; 2. Slider; 3. Cylinder; 4. Filling valve; 5. Stop valve; 6. Large pump; 7. Large servo motor; 8. Large pump safety valve; 9. Sensor; 10. Two-position three-way solenoid reversing valve; 11. Lower chamber safety valve; 12. Back pressure valve; 13. Quick-down ball valve; 14. Three-position four-way solenoid reversing valve; 15. Two-position four-way solenoid reversing valve; 16. Manifold; 17. Pressure sensor; 18. Small pump safety valve Full valve; 19. Large pump oil filter; 20. Small pump oil filter; 21. Small pump servo motor; 22. Small pump; 23. Bottom plate; 24. Rotary column one; 25. Front abutment plate; 26. Rear abutment plate; 27. Clamp plate; 28. Slide groove; 29. ​​Moving block; 30. Slide column; 31. Connecting plate; 32. Threaded hole; 33. Screw; 34. Rotary column two; 35. L-shaped small connecting column; 36. L-shaped large connecting column; 37. Connecting groove. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1 - Figure 5 The present invention provides a technical solution: an ultra-high precision eight-axis hydraulic servo system, including a large pump 6, a large servo motor 7, a small pump 22, a small pump servo motor 21, a pressure sensor 17, an integrated block 16, a filling valve 4, a two-position three-way electromagnetic reversing valve 10, a three-position four-way electromagnetic reversing valve 14, a two-position four-way electromagnetic reversing valve 15, a cylinder 3, a slider 2 and a workbench 1, the oil suction port of the large pump 6 is connected to the oil tank through a pipeline, and the oil outlet is connected to the integrated block 16, The oil suction port of the small pump 22 is also connected to the oil tank through a pipeline, and the oil outlet is connected to the integrated block 16. The D port of the integrated block 16 is connected to the lower chamber of the oil cylinder 3, the U port is connected to the upper chamber of the oil cylinder 3, and the F port is connected to the control port of the filling valve 4. The integrated block 16 is composed of a large pump safety valve 8, a pressure sensor 17, a two-position three-way solenoid reversing valve 10, a three-position four-way solenoid reversing valve 14, a two-position four-way solenoid reversing valve 15, a back pressure valve 12, a quick-down ball valve 13, and a small pump safety valve 18.

[0019] It should be noted that: when the slider 2 approaches the target value, it switches to a small-displacement servo pump group, and the slider 2 is precisely positioned by the forward and reverse rotation of the servo motor, which has high positioning accuracy, low heat generation, and is energy-saving and environmentally friendly; Furthermore, the lower chamber safety valve 11 provides safety protection for the overall operation and can stop working in time when a problem occurs.

[0020] See also Figure 1 The present invention provides a technical solution: an ultra-high precision eight-axis hydraulic servo system, including an oil suction port of a large pump 6 connected to a main oil tank through a pipeline, an oil outlet connected to a large pump oil filter 19, high-pressure oil is filtered by the large pump oil filter 19 and connected to an oil inlet P1 of an integrated block 16, an oil suction port of a small pump 22 connected to the main oil tank through a pipeline, an oil outlet connected to a small pump oil filter 20, high-pressure oil is filtered by the small pump oil filter 20 and connected to an oil inlet P2 of the integrated block 16, the integrated block 16 is convenient to assemble various valves with mounting screws, a working oil port D is connected to a lower chamber of a cylinder 3 through an oil pipe, and a working oil port U is connected to an upper chamber of a cylinder 3 through an oil pipe.

[0021] It should be noted that during the entire action process, the pressure is controlled by the torque of the servo motor, and the speed is controlled by the speed of the servo motor. The sensor 9 and the torque form a closed loop to control the system pressure in real time, and the speed and the servo motor speed form a closed loop to control the system speed in real time. The entire process is dynamically adjusted, with smooth transitions of acceleration and deceleration to achieve smooth, reliable, and ultra-high precision operation. When the hydraulic system filling valve fails, the stop valve 5 can be quickly closed, which is convenient for maintenance and prevents oil leakage.

[0022] See also Figure 4 The present invention provides a technical solution: an ultra-high precision eight-axis hydraulic servo system, comprising a rear abutment plate 26 fixedly installed on the top of the inner wall of a slider 2, a clamping plate 27 slidably installed on the side wall of the rear abutment plate 26, a front abutment plate 25 slidably installed on the side of the clamping plate 27 away from the rear abutment plate 26, a connecting groove 37 is opened on the inner wall of the clamping plate 27, a sliding column 30 is slidably installed on the inner wall of the connecting groove 37, and a moving block 29 is fixedly installed on the side wall of the sliding column 30.

[0023] It should be noted that by moving the moving block 29, the sliding column 30 can be driven to slide in the connecting groove 37, thereby adjusting the position and spacing of the clamping plates 27 to adapt to objects of different sizes or shapes, thereby increasing the versatility and flexibility of the device.

[0024] See also Figure 4 , Figure 5 The present invention provides a technical solution: an ultra-high precision eight-axis hydraulic servo system, including a clamping plate 27 with a slide groove 28 on the surface, a connecting plate 31 slidably installed on the inner wall of the slide groove 28, and the connecting plate 31 is fixedly installed on the inner wall of the sliding column 30.

[0025] It should be noted that when the clamping plate 27 is subjected to external force, the sliding connection between the slide groove 28 and the connecting plate 31 can disperse the stress and avoid structural damage caused by stress concentration, which helps to extend the service life of the equipment.

[0026] See also Figure 5 The present invention provides a technical solution: an ultra-high precision eight-axis hydraulic servo system, including a moving block 29 with a threaded hole 32 on the inner wall, a screw 33 threadedly connected to the inner wall of the threaded hole 32, and a rotating column 34 fixedly installed at the end of the screw 33 away from the moving block 29.

[0027] It should be noted that the threaded connection has a high structural strength and can withstand greater tension and pressure. This helps to enhance the stability and reliability of the entire structure and ensure that the equipment can maintain good performance when used for a long time or under heavy loads.

[0028] See also Figure 5 The present invention provides a technical solution: an ultra-high precision eight-axis hydraulic servo system, comprising a rotating column 2 34 inner wall of which is rotatably mounted an L-shaped small connecting column 35 and an L-shaped large connecting column 36, and a rotating column 24 is rotatably mounted on one end of the L-shaped small connecting column 35 and the L-shaped large connecting column 36 away from the screw 33.

[0029] It should be noted that the L-shaped connecting column makes the entire structure more compact and reasonable in space. By adjusting the angle and position of the L-shaped connecting column, limited space resources can be fully utilized to achieve more efficient layout and installation.

[0030] See also Figure 3 The present invention provides a technical solution: an ultra-high precision eight-axis hydraulic servo system, including a rotating column 24, the outer wall of which is rotatably mounted with a bottom plate 23, the top of the bottom plate 23 is fixedly mounted on the top of the inner wall of a slider 2, and the width of the bottom plate 23 is smaller than the width of the slider 2.

[0031] It should be noted that the base plate 23 is a key component connecting the rotating column 24 and the slider 2. Its width is smaller than the width of the slider 2, which helps to disperse the stress. When subjected to force, the stress can be more evenly distributed on the slider 2 and the base plate 23, avoiding structural damage caused by stress concentration.

[0032] Working principle: The system is controlled by eight independent hydraulic systems and can run according to the following workflow: mid-stop → fast down → working advance → pressing → fine adjustment → pressure maintenance → pressure relief → return → mid-stop. In the fast down stage, the three-position four-way solenoid reversing valve 14 and the fast down ball valve 13 are energized, and the pressure oil in the lower chamber of the oil cylinder 3 returns to the oil tank through the fast down ball valve 13 and the three-position four-way solenoid reversing valve 14. The slide block 2 descends by its own weight, and at the same time, the filling valve 4 is opened by self-priming, so that the hydraulic oil in the oil tank is sucked into the upper chamber of the oil cylinder 3, realizing the rapid descent of the slide block; In the working stage, the fast lower ball valve 13 is powered off, the large servo motor 7 runs at the set speed, and the hydraulic oil provided by the large pump 6 enters the upper chamber of the oil cylinder 3 through the two-position three-way electromagnetic reversing valve 10 and the three-position four-way electromagnetic reversing valve 14, driving the slide block 2 to move downward at the working speed; In the fine-tuning stage, the electromagnet of the two-position three-way electromagnetic reversing valve 10 is energized, the small pump servo motor 21 starts to operate, and the hydraulic oil provided by the small pump 22 enters the upper chamber of the oil cylinder 3 through the two-position three-way electromagnetic reversing valve 10 and the three-position four-way electromagnetic reversing valve 14, driving the slider 2 to fine-move, thereby achieving ultra-high precision positioning; During the pressure holding stage, the small pump servo motor 21 runs at a low speed to replenish the system leakage and maintain the pressure and position until the pressure holding time ends; During the pressure relief stage, the three-position four-way electromagnetic reversing valve 14 is powered off, which has a neutral unloading function, so that the pressure oil in the upper chamber of the oil cylinder 3 flows back to the oil tank, and the pressure drops to zero; During the return stroke, the electromagnets of the three-position four-way solenoid reversing valve 14 and the two-position four-way solenoid reversing valve 15 are energized, and the large servo motor 7 runs at a set speed. The pressure oil opens the filling valve 4 through the two-position four-way solenoid reversing valve 15, enters the lower chamber of the oil cylinder 3, and causes the slider 2 to move upward rapidly. When it reaches the top dead center, all valves are de-energized and the servo motor stops rotating.

Claims

1. An ultra-high precision eight-axis hydraulic servo system, comprising a large pump (6), a large servo motor (7), a small pump (22), a small pump servo motor (21), a pressure sensor (17), an integrated block (16), a filling valve (4), a two-position three-way electromagnetic reversing valve (10), a three-position four-way electromagnetic reversing valve (14), a two-position four-way electromagnetic reversing valve (15), a cylinder (3), a slide block (2) and a workbench (1), characterized in that: The oil suction port of the large pump (6) is connected to the oil tank through a pipeline, and the oil outlet is connected to the integrated block (16). The oil suction port of the small pump (22) is also connected to the oil tank through a pipeline, and the oil outlet is connected to the integrated block (16). The D port of the integrated block (16) is connected to the lower chamber of the oil cylinder (3), the U port is connected to the upper chamber of the oil cylinder (3), and the F port is connected to the control port of the filling valve (4). The integrated block (16) is composed of a large pump safety valve (8), a pressure sensor (17), a two-position three-way electromagnetic reversing valve (10), a three-position four-way electromagnetic reversing valve (14), a two-position four-way electromagnetic reversing valve (15), a back pressure valve (12), a quick-release ball valve (13), and a small pump safety valve (18).

2. An ultra-high precision eight-axis hydraulic servo system as claimed in claim 1, characterized in that: The oil suction port of the large pump (6) is connected to the main oil tank through a pipeline, and the oil outlet is connected to the large pump oil filter (19). The high-pressure oil is filtered by the large pump oil filter (19) and connected to the oil inlet P1 of the integrated block (16). The oil suction port of the small pump (22) is connected to the main oil tank through a pipeline, and the oil outlet is connected to the small pump oil filter (20). The high-pressure oil is filtered by the small pump oil filter (20) and connected to the oil inlet P2 of the integrated block (16). The integrated block (16) is conveniently assembled with various valves using mounting screws. The working oil port D is connected to the lower chamber of the oil cylinder (3) through an oil pipe, and the working oil port U is connected to the upper chamber of the oil cylinder (3) through an oil pipe.

3. The ultra-high precision eight-axis hydraulic servo system according to claim 1, characterized in that: A rear support plate (26) is fixedly mounted on the top of the inner wall of the slider (2), a clamping plate (27) is slidably mounted on the side wall of the rear support plate (26), a front support plate (25) is slidably mounted on the side of the clamping plate (27) away from the rear support plate (26), a connecting groove (37) is formed on the inner wall of the clamping plate (27), a sliding column (30) is slidably mounted on the inner wall of the connecting groove (37), and a moving block (29) is fixedly mounted on the side wall of the sliding column (30).

4. An ultra-high precision eight-axis hydraulic servo system as claimed in claim 3, characterized in that: A sliding groove (28) is provided on the surface of the clamping plate (27), a connecting plate (31) is slidably mounted on the inner wall of the sliding groove (28), and the connecting plate (31) is fixedly mounted on the inner wall of the sliding column (30).

5. The ultra-high precision eight-axis hydraulic servo system according to claim 3, characterized in that: The inner wall of the moving block (29) is provided with a threaded hole (32), the inner wall of the threaded hole (32) is threadedly connected with a screw rod (33), and a second rotating column (34) is fixedly mounted on the end of the screw rod (33) away from the moving block (29).

6. An ultra-high precision eight-axis hydraulic servo system as claimed in claim 5, characterized in that: An L-shaped small connecting column (35) and an L-shaped large connecting column (36) are rotatably mounted on the inner wall of the second rotating column (34); and a rotating column (24) is rotatably mounted on one end of the L-shaped small connecting column (35) and the L-shaped large connecting column (36) away from the screw rod (33).

7. An ultra-high precision eight-axis hydraulic servo system as claimed in claim 6, characterized in that: A bottom plate (23) is rotatably mounted on the outer wall of the rotating column (24); the top of the bottom plate (23) is fixedly mounted on the top of the inner wall of the sliding block (2); and the width of the bottom plate (23) is smaller than the width of the sliding block (2).

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