Oil press and oil pressing method thereof

Abstract

The invention relates to the technical field of oil pressure equipment, in particular to an oil press which comprises an oil pressure module and an oil supply module for supplying oil to the oil pressure module, the oil pressure module comprises a supporting seat, an upper die connecting seat, a lower die connecting seat, a main oil cylinder, an auxiliary oil cylinder and an auxiliary oil cylinder, the upper die connecting base and the lower die connecting base are slidably connected with the stand column, the auxiliary oil cylinder is in driving connection with the upper die connecting base and drives the upper die connecting base to ascend and descend, the auxiliary oil cylinder is in driving connection with the lower die connecting base and drives the lower die connecting base to ascend and descend, and the main oil cylinder is installed on the top of the stand column and exerts pressure on the upper die connecting base. The oil supply module comprises a main oil tank, an oil pump assembly and a pressure regulating system. Hydraulic oil pumped by the oil pump assembly is transmitted to the main oil cylinder, the auxiliary oil cylinder and the auxiliary oil cylinder through the pressure regulating system. Flexible closed-loop control over the oil press is achieved by arranging the pressure regulating system, the defects such as pause and jitter do not exist in the product forming process, and the qualified rate of products is increased.

Description

Technical Field

[0001] The invention relates to the technical field of oil pressure equipment, and in particular discloses an oil pressure machine and an oil pressure method thereof. Background Art

[0002] At present, hydraulic presses are widely used in the field of industrial manufacturing. The core of hydraulic presses is the precise driving of each working unit (such as the main cylinder, auxiliary cylinder and auxiliary cylinder) by the hydraulic system. However, the pressure regulating system of traditional hydraulic presses generally adopts a single pressure regulating device to supply oil to each cylinder through a unified oil supply pipeline, which is difficult to meet the different pressure and flow requirements of each cylinder, thus restricting the overall performance and processing accuracy of the equipment.

[0003] First, it is difficult for the traditional pressure regulating system to achieve independent and precise regulation of the pressure of each cylinder when multiple cylinders work together. Since the main cylinder, auxiliary cylinder and auxiliary cylinder have obvious differences in structure and work tasks, the use of a unified pressure regulating device often leads to excessive or insufficient pressure in some cylinders, which makes the upper and lower molds move out of sync, affecting the stability of mold closing and the quality of the processed parts.

[0004] Secondly, the insufficient response speed of oil supply in the existing technology is also a major problem. Under high-speed and high-load processing conditions, there are large pressure fluctuations and delays when the oil is transmitted in the pipeline, which can easily cause the hydraulic press to move slowly, increase vibration, and even cause overpressure. This not only affects production efficiency, but may also shorten the service life of the equipment and increase maintenance costs.

[0005] In addition, the traditional system has weak real-time monitoring of oil pressure and stroke, and lacks precise sensor feedback and intelligent adjustment mechanisms. When working conditions change or external disturbances occur during the processing, it is difficult for the pressure regulation system to adjust the working parameters in a timely and accurate manner, resulting in instability and safety hazards in equipment operation. Summary of the invention

[0006] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a hydraulic press with high stability, high processing quality, meeting different process requirements and fast response speed.

[0007] To achieve the above-mentioned purpose, a hydraulic press of the present invention comprises a hydraulic module and an oil supply module for supplying oil to the hydraulic module. The hydraulic module comprises a support seat, an upper die connection seat, a lower die connection seat and a main oil cylinder, a sub-oil cylinder and an auxiliary oil cylinder arranged on the support seat. A column is arranged on the support seat. The upper die connection seat and the lower die connection seat are slidably connected with the column. The sub-oil cylinder is drivably connected with the upper die connection seat and drives the upper die connection seat to rise and fall. The auxiliary oil cylinder is drivably connected with the lower die connection seat and drives the lower die connection seat to rise and fall. The main oil cylinder is installed on the top of the column and applies pressure to the upper die connection seat. The hydraulic module also comprises a quick oil supply device and a lower ejection mechanism. The quick oil supply mechanism is connected to the working chamber of the main oil cylinder for quick oil supply to the main oil cylinder; the external workpiece is placed between the upper die connection seat and the lower die connection seat, the lower ejector mechanism is arranged on the support seat, and the output shaft of the lower ejector mechanism passes through the auxiliary oil cylinder and the lower die connection seat to contact the workpiece; the oil supply module includes a main oil tank, an oil pump assembly and a pressure regulating system, the oil pump assembly is connected to the main oil tank via a pipeline and extracts hydraulic oil, the pressure regulating system is connected to the oil pump assembly via a pipeline, the pressure regulating system is connected to the main oil cylinder, the auxiliary oil cylinder and the auxiliary oil cylinder via a pipeline, and the hydraulic oil extracted by the oil pump assembly is transmitted to the main oil cylinder, the auxiliary oil cylinder and the auxiliary oil cylinder via the pressure regulating system. The quick oil supply device directly supplies oil to the working chamber of the main oil cylinder, shortening the oil filling time; the oil supply module extracts the hydraulic oil from the main oil tank through the oil pump assembly, and distributes it to each oil cylinder through the pressure regulating system, realizing precise pressure control, improving processing efficiency, and making the mold movement more stable and accurate. At the same time, the lower ejector mechanism effectively improves the demoulding efficiency of the workpiece and reduces the possibility of workpiece damage.

[0008] Furthermore, the lower ejection mechanism includes a driving member installed on the support seat, a movable plate connected to the output shaft of the driving member, and a lifting rod arranged on the movable plate. The movable plate is slidably arranged on the support seat. The upper mold connecting seat and the auxiliary oil cylinder are provided with avoidance holes. The lifting rod passes through the avoidance holes and contacts the external processing parts. Through the structural design of the lifting rod, the workpiece can be quickly ejected after the processing is completed, the processing efficiency is improved, the workpiece is prevented from sticking to the mold, and the production stability is improved. The lower ejection mechanism cooperates with the lower mold connecting seat.

[0009] Furthermore, the rapid oil supply mechanism includes an oil storage tank, an electromagnetic filling valve and a vacuum pump installed on the outer wall of the main oil cylinder. The oil storage tank is connected to the working chamber of the main oil cylinder via the vacuum pump, and the electromagnetic filling valve is used to control the circulation of hydraulic oil. The rapid oil supply mechanism reduces the filling time of the main oil cylinder, increases the operating speed of the oil cylinder, makes the equipment run more efficiently, and improves the overall production efficiency.

[0010] Furthermore, the annular area of ​​the main oil cylinder is larger than that of the auxiliary oil cylinder. The annular area of ​​the main oil cylinder (effective piston area) is larger than that of the auxiliary oil cylinder. Under the same oil pressure, the output force of the main oil cylinder is greater and it undertakes the main pressing task. The main oil cylinder provides large-tonnage pressing force, and the auxiliary oil cylinder assists in positioning. The division of labor is clear, which avoids power waste of the auxiliary oil cylinder and reduces system energy consumption.

[0011] Furthermore, the column outer sleeve is provided with two sets of guide sleeves, which are respectively connected to the upper die connection seat and the lower die connection seat, and the guide sleeve is provided with an oil injection hole, which is connected to an external lubricating oil pump, and the lubricating oil pump is used to regularly pump lubricating oil between the guide sleeve and the column. The guide sleeve and the column are slidably matched, and lubricating oil is regularly injected into the oil injection hole to reduce friction and wear, improve equipment durability and running stability, and reduce maintenance costs.

[0012] Furthermore, the oil pump assembly includes multiple groups of hydraulic pumps and oil pump motors, which are connected to the working chamber of the main oil tank. The oil pump motor drives the hydraulic pump to rotate and pumps the hydraulic oil in the main oil tank into the pressure regulating system. The pipeline connecting the hydraulic pump and the pressure regulating system is provided with an oil supply overflow valve, which is connected to the main oil tank and is used to adjust the pressure of the pipeline. The oil pump assembly includes multiple groups of hydraulic pumps and oil pump motors, which drive the hydraulic pump to operate and deliver the hydraulic oil in the main oil tank to the pressure regulating system. At the same time, the overflow valve is used to adjust the oil circuit pressure to avoid pressure overload. Multiple groups of hydraulic pumps can adjust the oil supply flow according to different work requirements, adapt to multi-process processing (such as pre-pressing, precision pressing), ensure the stable operation of each cylinder, and improve the safety and work efficiency of the system.

[0013] Furthermore, the pressure regulating system includes a first pressure regulating component and a second pressure regulating component. The first pressure regulating component is connected to the main oil cylinder and the auxiliary oil cylinder, and the second pressure regulating component is connected to the auxiliary oil cylinder. The hydraulic oil extracted by the oil pump assembly is transmitted to the main oil cylinder and the auxiliary oil cylinder via the first regulating component, and is transmitted to the auxiliary oil cylinder via the second regulating component.

[0014] Furthermore, the first pressure regulating assembly includes an oil supply pipeline and an oil return pipeline connecting the main oil cylinder, the auxiliary oil cylinder and the oil pump assembly. The oil supply pipeline and the oil return pipeline are both provided with a first electro-hydraulic reversing valve and a first hydraulically controlled one-way valve. The oil supply pipeline is provided with a proportional regulating valve, which is used to adjust the pressure distribution of different oil cylinders. The first pressure regulating assembly has the same structure as the second pressure regulating assembly. The proportional regulating valve distributes the pressure of the main / auxiliary oil cylinder according to the set ratio, the electro-hydraulic reversing valve switches the direction of the oil circuit, and the hydraulically controlled one-way valve locks the oil circuit to maintain pressure. The proportional valve realizes digital pressure distribution with an error of ≤1%, realizes complex process requirements, improves processing quality, and ensures the reliability of the equipment. The switching time of the electro-hydraulic reversing valve is less than 0.1 seconds, which responds quickly and improves the efficiency of the action.

[0015] Furthermore, the pressure regulating system also includes a photoelectric switch, a first grating sensor and a second grating sensor. The photoelectric switch is installed on the upper die connection seat to detect the distance between the upper die connection seat and the support seat. The first grating sensor is installed on the main oil cylinder to detect the active stroke of the output shaft of the main oil cylinder. The second grating sensor is installed on the auxiliary oil cylinder to detect the active stroke of the output shaft of the auxiliary oil cylinder. The sensor system can monitor the operating status of the hydraulic press in real time, improve processing accuracy, reduce errors, and perform intelligent control and fault warning, thereby improving the automation level and safety of the equipment.

[0016] A hydraulic method for a hydraulic press, characterized in that it comprises the following steps:

[0017] S1. The oil pump assembly drives the hydraulic oil in the main oil tank to enter the auxiliary oil cylinder through the pressure regulating system. The auxiliary oil cylinder drives the upper mold connecting seat to move downward and approach the lower mold connecting seat for rapid mold closing.

[0018] S2, when the photoelectric switch detects that the upper die connection seat is n mm away from the speed change point, the pressure regulating system controls the speed at which the hydraulic oil enters the auxiliary cylinder, and the upper die connection seat linearly decelerates and moves downward to the speed change point and stops;

[0019] S3, the pressure regulating system controls the multi-channel filling of hydraulic oil into the main cylinder, and the main cylinder drives the upper die connecting seat to advance quickly. When the first grating sensor detects that the upper die connecting seat advances to the surface of the workpiece, the pressure regulating system controls the speed at which the hydraulic oil enters the main cylinder, and the main cylinder enters a linear pressure-increasing state. After the pressure reaches the preset value, the pressure regulating system controls the main cylinder to maintain the pressure;

[0020] S4. After the pressure maintenance is completed, the pressure regulating system controls the main oil cylinder to release pressure smoothly, and the pressure regulating system controls the auxiliary oil cylinder to drive the upper die connection seat to return. When the photoelectric switch detects that the upper die connection seat is n mm away from the upper limit, the pressure regulating system controls the speed at which the hydraulic oil flows out of the auxiliary oil cylinder, and the upper die connection seat linearly decelerates and moves downward to the upper limit and stops;

[0021] S5. The pressure regulating system controls the auxiliary oil cylinder to drive the lower die connection seat to rise, and the driving member drives the lifting rod to pass through the avoidance hole to contact the external workpiece, so that the workpiece is separated from the lower die connection seat.

[0022] Beneficial effects of the present invention: the rapid oil supply device directly supplies oil to the working chamber of the main oil cylinder, shortening the oil filling time; the oil supply module extracts the hydraulic oil from the main oil tank through the oil pump assembly, and distributes it to each oil cylinder through the pressure regulating system, realizing precise pressure control, improving processing efficiency, making the mold movement more stable and accurate, and at the same time, the lower ejection mechanism effectively improves the demoulding efficiency of the workpiece and reduces the possibility of workpiece damage;

[0023] The guide sleeve and the column are slidably matched, and lubricating oil is regularly injected into the oil filling hole to reduce friction and wear, improve equipment durability and running stability, and reduce maintenance costs;

[0024] The oil pump assembly includes multiple sets of hydraulic pumps and oil pump motors. The oil pump motor drives the hydraulic pump to deliver the hydraulic oil in the main oil tank to the pressure regulating system. At the same time, the overflow valve is used to adjust the oil circuit pressure to avoid pressure overload. Multiple sets of hydraulic pumps can adjust the oil supply flow according to different work requirements, adapt to multi-process processing (such as pre-pressing, precision pressing), ensure the stable operation of each cylinder, and improve the safety and work efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a hydraulic press of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the oil pressure module of the present invention;

[0027] Figure 3 It is a structural schematic diagram of a hydraulic press of the present invention from another perspective;

[0028] Figure 4 It is a structural schematic diagram of the operating table of the present invention.

[0029] Reference numerals include:

[0030] 1. Hydraulic module; 2. Oil supply module; 3. Support seat; 4. Upper die connection seat; 5. Lower die connection seat; 6. Main oil cylinder; 7. Auxiliary oil cylinder; 8. Auxiliary oil cylinder; 9. Column; 10. Quick oil supply device; 11. Lower ejection mechanism; 12. Main oil tank; 13. Oil pump assembly; 14. Pressure regulating system; 15. Driving part; 16. Movable plate; 17. Lifting rod; 18. Oil storage tank; 19. Solenoid filling valve; 20. Vacuum pump; 21. Guide sleeve; 22. Oil pump motor; 23. Photoelectric switch; 24. First grating sensor; 25. Second grating sensor; 26. High-precision electronic control system; 27. Operating table; 28. Two-hand button. DETAILED DESCRIPTION

[0031] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0032] See also Figures 1 to 4As shown, a hydraulic press of the present invention comprises a hydraulic module 1 and an oil supply module 2 for supplying oil to the hydraulic module 1. The hydraulic module 1 comprises a support seat 3, an upper die connection seat 4, a lower die connection seat 5 and a main oil cylinder 6, a sub-oil cylinder 7 and an auxiliary oil cylinder 8 arranged on the support seat 3. A column 9 is arranged on the support seat 3. The upper die connection seat 4 and the lower die connection seat 5 are slidably connected with the column 9. The sub-oil cylinder 7 is drivingly connected to the upper die connection seat 4 and drives the upper die connection seat 4 to rise and fall. The auxiliary oil cylinder 8 is drivingly connected to the lower die connection seat 5 and drives the lower die connection seat 5 to rise and fall. The main oil cylinder 6 is installed on the top of the column 9 and applies pressure to the upper die connection seat 4. The hydraulic module 1 also comprises a quick oil supply device 10 and a lower ejection mechanism 11. The quick oil supply mechanism and The working chamber of the main oil cylinder 6 is connected for quickly supplying oil to the main oil cylinder 6; the external processing part is placed between the upper mold connecting seat 4 and the lower mold connecting seat 5, and the lower ejector mechanism 11 is arranged on the support seat 3. The output shaft of the lower ejector mechanism 11 passes through the auxiliary oil cylinder 8 and the lower mold connecting seat 5 to contact the processing part; the oil supply module 2 includes a main oil tank 12, an oil pump assembly 13 and a pressure regulating system 14. The oil pump assembly 13 is connected to the main oil tank 12 via a pipeline and extracts hydraulic oil. The pressure regulating system 14 is connected to the oil pump assembly 13 via a pipeline. The pressure regulating system 14 is connected to the main oil cylinder 6, the auxiliary oil cylinder 7 and the auxiliary oil cylinder 8 via a pipeline. The hydraulic oil extracted by the oil pump assembly 13 is transmitted to the main oil cylinder 6, the auxiliary oil cylinder 7 and the auxiliary oil cylinder 8 via the pressure regulating system 14. The fast oil supply device 10 directly supplies oil to the working chamber of the main oil cylinder 6, shortening the oil filling time; the oil supply module 2 draws hydraulic oil from the main oil tank 12 through the oil pump assembly 13, and distributes it to each cylinder through the pressure regulating system 14, thereby realizing precise pressure control, improving processing efficiency, and making the mold movement more stable and precise. At the same time, the lower ejection mechanism 11 effectively improves the demoulding efficiency of the workpiece and reduces the possibility of workpiece damage.

[0033] The lower ejection mechanism 11 includes a driving member 15 installed on the support seat 3, a movable plate 16 connected to the output shaft of the driving member 15, and a lifting rod 17 arranged on the movable plate 16. The movable plate 16 is slidably arranged on the support seat 3. The upper mold connecting seat 4 and the auxiliary oil cylinder 8 are provided with avoidance holes. The lifting rod 17 passes through the avoidance holes and hits the external processing parts. Through the structural design of the lifting rod 17, the workpiece can be quickly ejected after the processing is completed, the processing efficiency is improved, the workpiece is prevented from sticking to the mold, and the production stability is improved. The lower ejection mechanism 11 cooperates with the lower mold connecting seat 5.

[0034] The rapid oil supply mechanism includes an oil storage tank 18, an electromagnetic filling valve 19 and a vacuum pump 20 installed on the outer wall of the main oil cylinder 6. The oil storage tank 18 is connected to the working chamber of the main oil cylinder 6 via the vacuum pump 20. The electromagnetic filling valve 19 is used to control the circulation of hydraulic oil. The rapid oil supply mechanism reduces the filling time of the main oil cylinder 6, increases the cylinder operation speed, makes the equipment run more efficiently, and improves the overall production efficiency.

[0035] The annular area of ​​the main oil cylinder 6 is larger than that of the auxiliary oil cylinder 7. The annular area (effective piston area) of the main oil cylinder 6 is larger than that of the auxiliary oil cylinder 7. Under the same oil pressure, the output force of the main oil cylinder 6 is greater and it undertakes the main pressing task. The main oil cylinder 6 provides large-tonnage pressing force, and the auxiliary oil cylinder 7 assists in positioning. The division of labor is clear, which avoids power waste of the auxiliary oil cylinder 7 and reduces system energy consumption.

[0036] Two sets of guide sleeves 21 are provided on the outer sleeve of the column 9, and the two sets of guide sleeves 21 are respectively connected to the upper die connecting seat 4 and the lower die connecting seat 5. The guide sleeve 21 is provided with an oil injection hole, which is connected to an external lubricating oil pump. The lubricating oil pump is used to regularly pump lubricating oil between the guide sleeve 21 and the column 9. The guide sleeve 21 and the column 9 are slidably matched, and lubricating oil is regularly injected into the oil injection hole to reduce friction and wear, improve equipment durability and running stability, and reduce maintenance costs.

[0037] The oil pump assembly 13 includes multiple groups of hydraulic pumps and oil pump motors 22. The multiple groups of hydraulic pumps are connected to the working chamber of the main oil tank 12. The oil pump motor 22 drives the hydraulic pump to rotate and pumps the hydraulic oil in the main oil tank 12 into the pressure regulating system 14. The pipeline connecting the hydraulic pump and the pressure regulating system 14 is provided with an oil supply overflow valve. The oil supply overflow valve is connected to the main oil tank 12. The oil supply overflow valve is used to adjust the pressure of the pipeline. The oil pump assembly 13 includes multiple groups of hydraulic pumps and oil pump motors 22. The oil pump motor 22 drives the hydraulic pump to operate and delivers the hydraulic oil in the main oil tank 12 to the pressure regulating system 14. At the same time, the overflow valve is used to adjust the oil circuit pressure to avoid pressure overload. The multiple groups of hydraulic pumps can adjust the oil supply flow according to different work requirements, adapt to multi-process processing (such as pre-pressing, precision pressing), ensure the stable operation of each cylinder, and improve the safety and work efficiency of the system.

[0038] Specifically, the hydraulic pump and the oil pump motor 22 are each provided with five groups. The five groups of hydraulic pumps and the corresponding oil pump motors 22 are arranged in parallel, and each group is connected to the working chamber of the main oil tank 12. The oil pump motor 22 drives the hydraulic pump to rotate, extracts the hydraulic oil from the main oil tank 12 and delivers it to the pressure regulating system 14. The system can flexibly select to enable one or more groups of hydraulic pumps according to the real-time working conditions to achieve an efficient and stable oil supply process. Since five groups of hydraulic pumps and oil pump motors 22 are set, under normal working conditions, each group can work together to meet the requirements of large flow oil supply; and when some groups fail or shut down for maintenance, other groups can continue to work to ensure that the system oil supply is not interrupted, while sharing the overall workload and avoiding overloading of a single device. The system dynamically adjusts the number of enabled pumps according to the real-time pressure demand (such as only starting 1-2 groups of pumps in the no-load stage, and fully opening 5 groups of pumps in the high-pressure pressing stage) to avoid energy loss caused by excessive oil supply. The five pump combinations provide five levels of flow regulation (20%, 40%, 60%, 80%, 100%), adapting to all working conditions from high-speed idle stroke to high-pressure slow molding, and improving the overall energy efficiency by more than 25%. The redundant design enables the system to maintain 80% of the rated flow when a single pump fails, and the fault tolerance rate is increased to three times the industry average.

[0039] The pressure regulating system 14 includes a first pressure regulating component and a second pressure regulating component. The first pressure regulating component is connected to the main cylinder 6 and the auxiliary cylinder 7, and the second pressure regulating component is connected to the auxiliary cylinder 8. The hydraulic oil extracted by the oil pump assembly 13 is transmitted to the main cylinder 6 and the auxiliary cylinder 7 via the first regulating component, and is transmitted to the auxiliary cylinder 8 via the second regulating component.

[0040] The first pressure regulating assembly includes an oil supply pipeline and an oil return pipeline connecting the main oil cylinder 6, the auxiliary oil cylinder 7 and the oil pump assembly 13. The oil supply pipeline and the oil return pipeline are both provided with a first electro-hydraulic reversing valve and a first hydraulically controlled one-way valve. The oil supply pipeline is provided with a proportional regulating valve, which is used to adjust the pressure distribution of different oil cylinders. The first pressure regulating assembly has the same structure as the second pressure regulating assembly. The proportional regulating valve distributes the pressure of the main / auxiliary oil cylinder 7 according to the set ratio, the electro-hydraulic reversing valve switches the direction of the oil circuit, and the hydraulically controlled one-way valve locks the oil circuit to maintain pressure. The proportional valve realizes digital pressure distribution with an error of ≤1%, realizes complex process requirements, improves processing quality, and ensures the reliability of the equipment. The switching time of the electro-hydraulic reversing valve is less than 0.1 seconds, which responds quickly and improves the efficiency of the action.

[0041] The pressure regulating system 14 also includes a photoelectric switch 23, a first grating sensor 24 and a second grating sensor 25. The photoelectric switch 23 is installed on the upper die connection seat 4 to detect the distance between the upper die connection seat 4 and the support seat 3. The first grating sensor 24 is installed on the main oil cylinder 6 to detect the active stroke of the output shaft of the main oil cylinder 6. The second grating sensor 25 is installed on the auxiliary oil cylinder 8 to detect the active stroke of the output shaft of the auxiliary oil cylinder 8. The sensor system can monitor the operating status of the hydraulic press in real time, improve processing accuracy, reduce errors, and perform intelligent control and fault warning, thereby improving the automation level and safety of the equipment.

[0042] Specifically, the oil supply module 2 also includes a high-precision electronic control system 26, and the oil pump motor 22, the first electro-hydraulic reversing valve, the first hydraulically controlled non-return valve, the proportional control valve, the photoelectric switch 23, the first grating sensor 24, the second grating sensor 25, the electromagnetic filling valve 19 and the vacuum pump 20 are all electrically connected to the high-precision electronic control system 26. The high-precision electronic control system 26 is electrically connected to the key actuators such as the oil pump motor 22, the first electro-hydraulic reversing valve, the first hydraulically controlled non-return valve and the proportional control valve to achieve precise control of oil delivery and pressure distribution. At the same time, the system collects the upper mold position, the stroke information of the main oil cylinder 6 and the auxiliary oil cylinder 8 in real time through the photoelectric switch 23, the first grating sensor 24 and the second grating sensor 25, forming a closed-loop feedback control. Through real-time monitoring and closed-loop control, the high-precision electronic control system 26 can significantly reduce oil supply delays and pressure fluctuations, ensure accurate movement of the oil cylinder, and thus improve the synchronization and stability of the entire hydraulic press during mold closing, mold separation, and workpiece ejection. The precise electronic control system can adjust the oil pump and valve status at the moment of detecting changes in working conditions, making the system respond more quickly, meeting the requirements of high-load, high-speed processing environments, and avoiding processing errors or equipment vibrations caused by untimely oil supply.

[0043] Specifically, a pressure sensor is provided on the upper mold connecting seat 4, and the pressure sensor is electrically connected to the high-precision electronic control system 26. When the pressure sensor detects that the pressure of the upper mold connecting seat 4 is abnormal, the high-precision electronic control system 26 controls the upper mold connecting seat 4 to stop closing the mold and return to the initial position via the pressure regulating system 14.

[0044] Specifically, the hydraulic press also includes an operating table 27, which is electrically connected to the high-precision electronic control system 26. A two-hand button 28 is provided on the operating table 27, and the two-hand button 28 is used to start and close the hydraulic press. The design of the two-hand button 28 requires the operator to press the button with both hands at the same time during the startup or processing process, thereby avoiding the risk of misoperation that may be caused by one-handed operation. This design effectively prevents startup accidents caused by operator negligence and improves the safety of the equipment.

[0045] Specifically, a safety grating sensor is provided on the upper mold connection base 4, and the safety grating sensor is electrically connected to the high-precision electronic control system 26. When the safety grating sensor is blocked, the high-precision electronic control system 26 controls the hydraulic press to stop working. When an object (such as the operator's hand or other body parts) is detected to be blocked, a warning signal can be immediately issued and the hydraulic press can be controlled to stop working, thereby preventing crushing or collision accidents caused by accidental blocking.

[0046] A hydraulic method for a hydraulic press, characterized in that it comprises the following steps:

[0047] S1, the oil pump assembly 13 drives the hydraulic oil in the main oil tank 12 to enter the auxiliary oil cylinder 7 through the pressure regulating system 14, and the auxiliary oil cylinder 7 drives the upper mold connecting seat 4 to move downward and approach the lower mold connecting seat 5 for rapid mold closing;

[0048] S2, when the photoelectric switch 23 detects that the upper die connection seat 4 moves downward n millimeters from the speed change point, the pressure regulating system 14 controls the speed at which the hydraulic oil enters the auxiliary oil cylinder 7, and the upper die connection seat 4 linearly decelerates and moves downward to the speed change point and stops;

[0049] S3, the pressure regulating system 14 controls the multi-channel filling of hydraulic oil into the main oil cylinder 6, and the main oil cylinder 6 drives the upper die connecting seat 4 to move forward quickly. When the first grating sensor 24 detects that the upper die connecting seat 4 moves to the surface of the workpiece, the pressure regulating system 14 controls the speed at which the hydraulic oil enters the main oil cylinder 6, and the main oil cylinder 6 enters a linear pressure-increasing state. After the pressure reaches the preset value, the pressure regulating system 14 controls the main oil cylinder 6 to maintain the pressure;

[0050] S4, after the pressure maintenance is completed, the pressure regulating system 14 controls the main oil cylinder 6 to release pressure smoothly, and the pressure regulating system 14 controls the auxiliary oil cylinder 7 to drive the upper die connecting seat 4 to return. When the photoelectric switch 23 detects that the upper die connecting seat 4 is n mm away from the upper limit, the pressure regulating system 14 controls the speed at which the hydraulic oil flows out of the auxiliary oil cylinder 7, and the upper die connecting seat 4 linearly decelerates and moves downward to the upper limit and stops;

[0051] S5, the pressure regulating system 14 controls the auxiliary oil cylinder 8 to drive the lower die connecting seat 5 to rise, and the driving member 15 drives the lifting rod 17 to pass through the avoidance hole to contact the external workpiece, so that the workpiece is separated from the lower die connecting seat 5.

[0052] Specifically, step S1 specifically includes: the hydraulic pump and the oil pump motor 22 are started, the hydraulic oil in the main oil tank 12 is pumped into the pressure regulating system 14, the high-precision electronic control system 26 controls the second electro-hydraulic reversing valve and the second hydraulically controlled one-way valve of the second pressure regulating component to be closed, and the first proportional regulating valve of the first pressure regulating component controls the hydraulic oil flow to the auxiliary cylinder 7, and the auxiliary cylinder 7 drives the upper mold connecting seat 4 to move downward and approach the lower mold connecting seat 5 for rapid mold closing.

[0053] Specifically, the step S2 specifically includes: when the photoelectric switch 23 detects that the upper die connection seat 4 is n millimeters away from the speed change point, the high-precision electronic control system 26 controls the first proportional regulating valve of the first pressure regulating assembly to uniformly reduce the speed at which the hydraulic oil enters the auxiliary oil cylinder 7, and the upper die connection seat 4 linearly decelerates and descends to the speed change point and stops. Through flexible control processing, the impact of the weight of the upper die connection seat 4 itself is eliminated, the vibration of the equipment and the impact of the oil circuit are significantly reduced, the stability of the equipment is improved, and the service life of the entire hydraulic press is increased.

[0054] Specifically, step S3 specifically includes: after the first grating sensor 24 senses that the output shaft of the main oil cylinder 6 reaches the specified position, the high-precision electronic control system 26 controls the first proportional regulating valve to allow the hydraulic oil to flow into the main oil cylinder 6, the electromagnetic filling valve 19 and the vacuum pump 20 are started, and the hydraulic oil in the oil storage tank 18 flows into the main oil cylinder 6 at the same time, and the high-precision electronic control system 26 controls the first proportional regulating valve to evenly increase the speed of the hydraulic oil entering the main oil cylinder 6, and the main oil cylinder 6 enters a linear boost state. After the pressure reaches the preset value, the high-precision electronic control system 26 controls the first hydraulic control check valve to close for pressure maintenance. The confluence of multiple pumps increases the working speed of the main oil cylinder 6, which is particularly effective for red satin workpieces.

[0055] Specifically, during reverse stretching, the step S3 also includes: after maintaining pressure, the high-precision electronic control system 26 controls the second electro-hydraulic reversing valve and the second hydraulically controlled one-way valve of the second pressure regulating component to open, and the first electro-hydraulic reversing valve and the first hydraulically controlled one-way valve of the first pressure regulating component to open, and the hydraulic oil flows into the auxiliary cylinder 8, and the auxiliary cylinder 8 drives the lower mold connecting seat 5 and the upper mold connecting seat 4 upward to complete the reverse stretching molding of the processing price.

[0056] Here’s how it works:

[0057] During positive stretching, the high-precision electronic control system 26 controls the auxiliary oil cylinder 7 to drive the upper die connection seat 4 to move downward quickly. When the photoelectric switch 23 detects that the upper die connection seat 4 is n millimeters away from the speed change point when it moves downward, the high-precision electronic control system 26 controls the upper die connection seat 4 to start decelerating, and then the upper die connection seat 4 and the lower die connection seat 5 are closed. The high-precision electronic control system 26 controls the main oil cylinder 6 to drive the upper die connection seat 4 to continue to move downward to complete the positive stretching forming. The high-precision electronic control system 26 controls the main oil cylinder 6 and the auxiliary oil cylinder 7 to drive the upper die connection seat 4 to return. When the photoelectric switch 23 detects that the upper die connection seat 4 is n millimeters away from the upper limit, the high-precision electronic control system 26 controls the speed at which the hydraulic oil flows out of the auxiliary oil cylinder 7. The upper die connection seat 4 linearly decelerates and moves downward to the upper limit and stops. The auxiliary oil cylinder 8 drives the lower die connection seat 5 to move upward, and the driving member 15 drives the lifting rod 17 to pass through the avoidance hole to contact the external workpiece, so that the workpiece is separated from the lower die connection seat 5.

[0058] During reverse stretching, the high-precision electronic control system 26 controls the auxiliary oil cylinder 7 to drive the upper die connection seat 4 to move downward quickly. When the photoelectric switch 23 detects that the upper die connection seat 4 moves downward n millimeters from the speed change point, the high-precision electronic control system 26 controls the upper die connection seat 4 to start decelerating, and then the upper die connection seat 4 and the lower die connection seat 5 are molded together. The high-precision electronic control system 26 controls the main oil cylinder 6 to drive the upper die connection seat 4 to continue to move downward and maintain pressure to complete the edge pressing of the workpiece. After maintaining pressure, the high-precision electronic control system 26 controls the auxiliary oil cylinder 8 to drive the lower die connection seat 5 and the upper die The connecting seat 4 moves upward to complete the reverse stretching forming of the processing price. The high-precision electronic control system 26 controls the main cylinder 6 and the auxiliary cylinder 7 to drive the upper mold connecting seat 4 to return. When the photoelectric switch 23 detects that the upper mold connecting seat 4 is n mm away from the upper limit, the high-precision electronic control system 26 controls the speed at which the hydraulic oil flows out of the auxiliary cylinder 7, and the upper mold connecting seat 4 linearly decelerates and moves downward to the upper limit and stops. The auxiliary cylinder 8 drives the lower mold connecting seat 5 to move upward, and the driving member 15 drives the lifting rod 17 to pass through the avoidance hole to contact the external workpiece, so that the workpiece is separated from the lower mold connecting seat 5.

[0059] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A hydraulic press, comprising a hydraulic module (1), an oil supply module (2) for supplying oil to the hydraulic module (1), the hydraulic module (1) comprising a support seat (3), an upper die connection seat (4), a lower die connection seat (5), and a main oil cylinder (6), a sub-oil cylinder (7) and an auxiliary oil cylinder (8) arranged on the support seat (3), a column (9) being arranged on the support seat (3), the upper die connection seat (4), the lower die connection seat (5) being slidably connected to the column (9), the sub-oil cylinder (7) being drivingly connected to the upper die connection seat (4) and driving the upper die connection seat (4) to rise and fall, the auxiliary oil cylinder (8) being drivingly connected to the lower die connection seat (5) and driving the lower die connection seat (5) to rise and fall, the main oil cylinder (6) being installed on the top of the column (9) and applying pressure to the upper die connection seat (4); characterized in that: The oil pressure module (1) further comprises a quick oil supply device (10) and a lower ejection mechanism (11); the quick oil supply device (10) is connected to the working chamber of the main oil cylinder (6) for quick oil supply to the main oil cylinder (6); the external workpiece is placed between the upper die connection seat (4) and the lower die connection seat (5); the lower ejection mechanism (11) is arranged on the support seat (3); the output shaft of the lower ejection mechanism (11) passes through the auxiliary oil cylinder (8) and the lower die connection seat (5) to contact the workpiece; the oil supply module (2) comprises A main oil tank (12), an oil pump assembly (13) and a pressure regulating system (14); the oil pump assembly (13) is connected to the main oil tank (12) via a pipeline and extracts hydraulic oil; the pressure regulating system (14) is connected to the oil pump assembly (13) via a pipeline; the pressure regulating system (14) is connected to the main oil cylinder (6), the auxiliary oil cylinder (7) and the auxiliary oil cylinder (8) via a pipeline; the hydraulic oil extracted by the oil pump assembly (13) is transmitted to the main oil cylinder (6), the auxiliary oil cylinder (7) and the auxiliary oil cylinder (8) via the pressure regulating system (14).

2. A hydraulic press according to claim 1, characterized in that: The lower ejection mechanism (11) comprises a driving member (15) mounted on a support seat (3), a movable plate (16) connected to an output shaft of the driving member (15), and a lifting rod (17) arranged on the movable plate (16); the movable plate (16) is slidably arranged on the support seat (3); avoidance holes are arranged on the upper die connecting seat (4) and the auxiliary oil cylinder (8); and the lifting rod (17) passes through the avoidance holes and contacts an external processed part.

3. The hydraulic press according to claim 1, characterized in that: The rapid oil supply device (10) comprises an oil storage tank (18) mounted on the outer wall of the main oil cylinder (6), an electromagnetic filling valve (19) and a vacuum pump (20); the oil storage tank (18) is connected to the working chamber of the main oil cylinder (6) via the vacuum pump (20); and the electromagnetic filling valve (19) is used to control the circulation of hydraulic oil.

4. The hydraulic press according to claim 1, characterized in that: The annular area of ​​the main oil cylinder (6) is larger than the annular area of ​​the auxiliary oil cylinder (7).

5. The hydraulic press according to claim 1, characterized in that: The column (9) is provided with two groups of guide sleeves (21) on its outer sleeve, and the two groups of guide sleeves (21) are respectively connected to the upper die connecting seat (4) and the lower die connecting seat (5). The guide sleeves (21) are provided with oil injection holes, which are connected to an external lubricating oil pump. The lubricating oil pump is used to regularly pump lubricating oil between the guide sleeves (21) and the column (9).

6. The hydraulic press according to claim 1, characterized in that: The oil pump assembly (13) comprises a plurality of hydraulic pumps and an oil pump motor (22). The plurality of hydraulic pumps are connected to the working chamber of the main oil tank (12). The oil pump motor (22) drives the hydraulic pump to rotate, and pumps the hydraulic oil in the main oil tank (12) into the pressure regulating system (14). An oil supply overflow valve is provided on the pipeline connecting the hydraulic pump and the pressure regulating system (14). The oil supply overflow valve is connected to the main oil tank (12). The oil supply overflow valve is used to adjust the pressure of the pipeline.

7. The hydraulic press according to claim 1, characterized in that: The pressure regulating system (14) comprises a first pressure regulating assembly and a second pressure regulating assembly, wherein the first pressure regulating assembly is connected to the main oil cylinder (6) and the auxiliary oil cylinder (7), and the second pressure regulating assembly is connected to the auxiliary oil cylinder (8); the hydraulic oil extracted by the oil pump assembly (13) is transmitted to the main oil cylinder (6) and the auxiliary oil cylinder (7) via the first regulating assembly, and is transmitted to the auxiliary oil cylinder (8) via the second regulating assembly.

8. The hydraulic press according to claim 7, characterized in that: The first pressure regulating assembly comprises an oil supply pipeline and an oil return pipeline connecting the main oil cylinder (6), the auxiliary oil cylinder (7) and the oil pump assembly (13); the oil supply pipeline and the oil return pipeline are both provided with a first electro-hydraulic reversing valve and a first hydraulically controlled non-return valve; the oil supply pipeline is provided with a proportional regulating valve, which is used to adjust the pressure distribution of different oil cylinders; the first pressure regulating assembly and the second pressure regulating assembly have the same structure.

9. The hydraulic press according to claim 1, characterized in that: The pressure regulating system (14) further comprises a photoelectric switch (23), a first grating sensor (24) and a second grating sensor (25); the photoelectric switch (23) is mounted on the upper die connecting seat (4) for detecting the distance between the upper die connecting seat (4) and the supporting seat (3); the first grating sensor (24) is mounted on the main oil cylinder (6) for detecting the movable stroke of the output shaft of the main oil cylinder (6); and the second grating sensor (25) is mounted on the auxiliary oil cylinder (8) for detecting the movable stroke of the output shaft of the auxiliary oil cylinder (8).

10. A hydraulic method for a hydraulic press, characterized in that: The steps include: S1, the oil pump assembly (13) drives the hydraulic oil in the main oil tank (12) to enter the auxiliary oil cylinder (7) through the pressure regulating system (14), and the auxiliary oil cylinder (7) drives the upper mold connecting seat (4) to move downward and approach the lower mold connecting seat (5) for rapid mold closing; S2, when the photoelectric switch (23) detects that the upper die connecting seat (4) moves downward n millimeters from the speed change point, the pressure regulating system (14) controls the speed at which the hydraulic oil enters the auxiliary oil cylinder (7), and the upper die connecting seat (4) linearly decelerates and moves downward to the speed change point and stops; S3, the pressure regulating system (14) controls the multi-channel filling of hydraulic oil into the main oil cylinder (6), and the main oil cylinder (6) drives the upper die connecting seat (4) to advance rapidly. When the first grating sensor (24) detects that the upper die connecting seat (4) advances to the surface of the workpiece, the pressure regulating system (14) controls the speed at which the hydraulic oil enters the main oil cylinder (6), and the main oil cylinder (6) enters a linear pressure increase state. After the pressure reaches a preset value, the pressure regulating system (14) controls the main oil cylinder (6) to maintain the pressure; S4. After the pressure maintenance is completed, the pressure regulating system (14) controls the main oil cylinder (6) to release the pressure steadily, and the pressure regulating system (14) controls the auxiliary oil cylinder (7) to drive the upper die connecting seat (4) to return. When the photoelectric switch (23) detects that the upper die connecting seat (4) is n millimeters away from the upper limit, the pressure regulating system (14) controls the speed at which the hydraulic oil flows out of the auxiliary oil cylinder (7), and the upper die connecting seat (4) linearly decelerates and moves downward to the upper limit and stops. S5. The pressure regulating system (14) controls the auxiliary oil cylinder (8) to drive the lower die connection seat (5) to rise, and the driving member (15) drives the lifting rod (17) to pass through the avoidance hole to contact the external workpiece, so that the workpiece is separated from the lower die connection seat (5).

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