Hydraulic machine pressure oil pressure regulating system, method and medium

Abstract

The application relates to a hydraulic machine pressure oil pressure regulating system, method and medium, and the system specifically comprises a power oil pump, two oil paths and an oil tank, the oil tank contains a first oil return cavity, one end of the two oil paths is connected to an oil outlet end of the power oil pump, the other end of the two oil paths is respectively connected to two oil cavities of a return cylinder, the oil outlet end of the power oil pump is provided with a high / low pressure switching module of pressure oil, and the high / low pressure switching module of pressure oil comprises a hydraulic valve, a first regulating valve, a second regulating valve and a double electromagnetic valve. The application realizes quick and stable switching of the hydraulic machine pressure oil pressure, and enables personnel to directly control the high / low pressure state of the hydraulic machine through a control module and the oil pressure value when the hydraulic machine is in the high / low pressure state, and can correct unstable oil pressure in the hydraulic machine.

Description

Technical Field

[0001] This application relates to the field of hydraulic press control, and in particular to a hydraulic press pressure oil regulating system, method and medium. Background Technology

[0002] A hydraulic press is an industrial device that uses liquid as its working medium, commonly used for pressing and shaping materials such as metals, plastics, and rubber. Hydraulic presses typically use an oil pump as their power source, transmitting oil pressure to the workpiece through the working medium via the Pascal effect. The required pressure varies depending on the different steps the hydraulic press performs; therefore, how to control the oil pressure switching during these different steps is a crucial problem that must be solved.

[0003] Currently, hydraulic presses that adjust only a single pressure valve to achieve oil pressure control cannot achieve stable oil pressure switching during oil pressure adjustment, and it is difficult to achieve a fast oil pressure switching speed. Therefore, they cannot meet the process requirements in some working scenarios that require frequent pressure switching. Summary of the Invention

[0004] To ensure rapid and stable switching control of hydraulic press oil pressure, this application provides a hydraulic press oil pressure regulation system, method, equipment, and medium.

[0005] Firstly, this application provides a hydraulic press pressure regulating system:

[0006] A hydraulic press pressure regulating system includes a power oil pump, two oil circuits, and an oil tank. The oil tank contains a first return oil chamber. One end of each of the two oil circuits is connected to the outlet of the power oil pump, and the other end is connected to the two oil chambers of the return cylinder. The outlet of the power oil pump is equipped with a high / low pressure switching module. The high / low pressure switching module includes a hydraulic valve, a first regulating valve, a second regulating valve, and a double solenoid valve. The double solenoid valve includes two valve components, namely a first solenoid valve and a second solenoid valve. The main oil port of the hydraulic valve is connected to the outlet of the power oil pump, the control oil port of the hydraulic valve is connected to the outlet of the second regulating valve, the inlet of the hydraulic valve is connected to the inlet of the first regulating valve, the second regulating valve, and the first solenoid valve, the outlet of the first regulating valve is connected to the inlet of the second solenoid valve, and the outlet of the second solenoid valve is connected to the first return oil chamber for oil storage.

[0007] By adopting the above technical solution, high-pressure oil supply control, low-pressure oil supply control, and zero-pressure standby control of the hydraulic press are achieved. The multi-valve oil pressure control system ensures the stability of oil pressure during oil pressure switching. When the hydraulic press requires high-pressure operation, the first solenoid valve is opened, and hydraulic oil flows through the hydraulic valve to the second regulating valve. The second regulating valve is adjusted to create a fixed amount of back pressure, thus increasing the hydraulic oil pressure. When the hydraulic press requires low-pressure operation, the first solenoid valve is closed, and the second solenoid valve is opened. Hydraulic oil flows through the hydraulic valve to both the first and second regulating valves simultaneously. The hydraulic oil then flows through the opened oil circuit to the return oil chamber connected to the outlet of the double solenoid valve, thus ensuring that... When the hydraulic press is in standby mode, the hydraulic oil pressure is lower to supply oil to the hydraulic press. When the hydraulic press is in standby mode, neither the first nor the second solenoid valve is energized, the oil circuit is fully open, and the hydraulic oil flows through the oil inlet of the hydraulic valve to the return oil chamber connected to the double solenoid valve, thus making the hydraulic oil pressure zero. Switching between the above three modes only requires the operator to input the required pressure information of the hydraulic press through the control module. The control module controls the first and second solenoid valves, the first regulating valve, and the second regulating valve, thereby enabling the operator to quickly switch the working pressure of the hydraulic press. Furthermore, the linkage control of multiple valves reduces the influence of external disturbance factors.

[0008] Preferably, it also includes an oil pressure correction circuit, which includes a regulating oil pump and a correction valve. The oil inlet of the correction valve is connected to the oil outlet of the regulating oil pump, and the oil outlet of the correction valve is connected to a return cylinder B chamber that leads to the return cylinder for controlling the extension of the return cylinder.

[0009] By adopting the above technical solution, an oil pressure value correction link is added to the oil pressure control system, which reduces the pressure fluctuations during hydraulic press operation caused by the instability of the flow pulsation curve of the plunger oil pump.

[0010] Preferably, it also includes a control module, which can control the hydraulic valve, the first regulating valve, the second regulating valve, and the double solenoid valve. The double solenoid valve is connected to the control module and is controlled by the control module.

[0011] By adopting the above technical solution, the hydraulic control system is controlled by the control module, enabling the hydraulic press to quickly respond to personnel control signals when switching hydraulic pressure. At the same time, the control module can obtain personnel's hydraulic pressure control information to make the hydraulic press work according to personnel requirements.

[0012] Preferably, the oil tank further includes a second return oil chamber, which is connected to the oil outlet of the second regulating valve and the oil control port of the hydraulic valve.

[0013] By adopting the above technical solution, when the hydraulic press is in a high oil pressure state, all the hydraulic oil flows to the second regulating valve. The oil outlet of the second regulating valve is connected to the second return oil chamber, so that the hydraulic oil can be buffered once in the second return oil chamber when the hydraulic press is in a high oil pressure state, reducing the impact of high oil pressure on the valve body.

[0014] Preferably, the flow rate of the first regulating valve is greater than that of the second regulating valve.

[0015] By adopting the above technical solution, when the hydraulic press is in a low oil pressure state, the hydraulic oil flows to both the first regulating valve and the second regulating valve at the same time. The flow rate of the first regulating valve is greater than that of the second regulating valve. Therefore, most of the hydraulic oil will flow through the first regulating valve to the return oil chamber connected to the oil outlet of the double solenoid valve, so that the hydraulic press can work in a lower oil pressure state.

[0016] Secondly, this application provides a method for regulating the pressure of hydraulic press oil:

[0017] Acquire pressure information entered by personnel through the control module;

[0018] Based on the preset pressure standard, determine whether the pressure information is high oil pressure information;

[0019] If so, the first solenoid valve is opened to allow hydraulic oil to flow through the hydraulic valve to the second regulating valve, and then through the opened oil circuit to the second return oil chamber connected to the oil outlet of the second regulating valve, thereby increasing the working pressure inside the hydraulic press.

[0020] By adopting the above technical solution, when the hydraulic press needs to work under high pressure, only the required pressure information needs to be manually configured, and the oil pressure regulation system will automatically control the relevant valves to make the hydraulic press working oil pressure reach the corresponding process standard.

[0021] Preferably, after determining whether the control signal type is a high oil pressure control signal, the method further includes the following steps: if not, the first solenoid valve is closed and the second solenoid valve is opened so that hydraulic oil flows through the hydraulic valve to both the first regulating valve and the second regulating valve. The hydraulic oil flows through the opened oil circuit to the first return oil chamber connected to the oil outlet of the double solenoid valve, and the other part flows to the second return oil chamber connected to the oil outlet of the second regulating valve, thereby reducing the internal working pressure of the hydraulic press.

[0022] By adopting the above technical solution, the switching between high oil pressure and low oil pressure working states of the hydraulic press can be completed, eliminating the need for manual adjustment of the pressure regulating valve and realizing automatic control.

[0023] Preferably, the hydraulic press pressure adjustment method further includes a pressure calibration step, specifically comprising the following steps:

[0024] The real-time pressure value inside the working cylinder during one working stroke of the hydraulic press is obtained by a pressure sensor;

[0025] The real-time working curve of the hydraulic press is derived from the real-time pressure value inside the working cylinder during one working stroke of the hydraulic press. The real-time working curve is a pressure-time function curve.

[0026] The pressure values ​​at each time point of the real-time working curve are compared with the pressure information entered by the personnel, and the difference between the two is calculated.

[0027] A pressure correction signal is generated based on the difference between the two.

[0028] The pressure correction signal is converted into a flow opening signal according to a preset pressure-flow reference table;

[0029] The opening flow rate of the correction valve is controlled according to the flow opening signal to complete the oil pressure correction.

[0030] By adopting the above technical solution, the unstable oil pressure of the hydraulic press caused by the unstable flow pulsation curve of the plunger pump is stabilized, enabling the hydraulic press to generate stable oil pressure to adapt to processes with high requirements for oil pressure stability.

[0031] Thirdly, this application provides a computer-readable storage medium that stores a program for a hydraulic press pressure oil regulating system that can be loaded and executed by a processor.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. It realizes the control of the hydraulic press oil pressure value, completes the switching between high oil pressure and low oil pressure states of the hydraulic press, and ensures the stability of the internal oil pressure value when the hydraulic press switches between different oil pressure values;

[0034] 2. It enables pressure value adjustment when the hydraulic press is operating at high or low pressure, allowing the hydraulic press to freely adjust the high or low pressure value according to the different pressure value requirements of different processes, thus improving the versatility of the hydraulic press;

[0035] 3. To reduce the instability of hydraulic pressure caused by the unstable flow pulsation of the piston pump, an oil pressure correction process is introduced to make the output oil pressure of the hydraulic press reach a relatively stable level, so that the hydraulic press can meet the high requirements of the process. Attached Figure Description

[0036] Figure 1 This is an oil circuit diagram of a hydraulic press pressure oil regulating system according to an embodiment of this application.

[0037] Figure 2 This is a flowchart of a hydraulic press pressure oil pressure regulation method according to an embodiment of this application.

[0038] Figure 3 This is a flowchart of the oil pressure correction step in a hydraulic press pressure oil pressure regulation method according to an embodiment of this application.

[0039] Explanation of reference numerals in the attached diagram: 1. Power oil pump; 2. Second return oil chamber; 3. First return oil chamber; 4. Hydraulic valve; 5. Second regulating valve; 6. First regulating valve; 7. Double solenoid valve; 7a. First solenoid valve; 7b. Second solenoid valve; 8. Calibration oil pump; 9. Calibration valve; 10. Oil circuit one; 11. Oil circuit two; 12. High and low pressure oil switching module. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0041] This application discloses a hydraulic press pressure regulating system. (Reference) Figure 1 A hydraulic press pressure oil regulating system includes: a power oil pump 1, two oil passages leading to return cylinder A chamber and return cylinder B chamber, and an oil tank. The return cylinder A chamber controls the retraction of the return cylinder, and the return cylinder B chamber controls the extension of the return cylinder. The oil tank is provided with a first return oil chamber 3 and a second return oil chamber 2. One end of the two oil passages is fixedly connected to the oil outlet of the power oil pump 1 and communicates with the oil outlet of the power oil pump 1. The other end leads to the return cylinder A chamber and the return cylinder B chamber.

[0042] The oil outlet of the power oil pump 1 is also connected to a pressure oil switching module. After the hydraulic oil is output from the power oil pump 1, it passes through the pressure oil switching module. The pressure oil switching module divides the hydraulic oil under different pressure working modes in different ways and then leads it to the two chambers of the return cylinder. The pressure oil switching module includes a hydraulic valve 4, a first regulating valve 6, a second regulating valve 5, and a double solenoid valve 7. The double solenoid valve 7 has two valve components, namely a first solenoid valve 7a and a second solenoid valve 7b.

[0043] The oil outlet of the power oil pump 1 is connected to the main oil port of the hydraulic valve 4. The oil control port of the hydraulic valve 4 is connected to the oil outlet of the second regulating valve 5. The oil passage of the hydraulic valve 4 is connected to the oil inlet of the first regulating valve 6, the second regulating valve 5, and the first solenoid valve 7a. The oil outlet of the first regulating valve 6 is connected to the oil inlet of the second solenoid valve 7b. The oil outlet of the second solenoid valve 7b is connected to the first return oil chamber 3.

[0044] refer to Figure 1The hydraulic oil pressure regulating system of a hydraulic press also includes an oil pressure correction oil circuit. The oil pressure correction oil circuit uses a regulating oil pump as a power source. The oil outlet of the regulating oil pump is connected to the oil inlet of the correction valve 9. The oil outlet of the correction valve 9 leads to the return cylinder B chamber.

[0045] The power oil pump 1 is a plunger pump. The first regulating valve 6 and the second regulating valve 5 are pressure regulating valves. When the system is already in a high / low pressure state, the output working oil pressure of the system in the high / low pressure state can be adjusted by regulating the oil flow of the first regulating valve 6 and the second regulating valve 5. The first regulating valve 6 is set as a low pressure regulating valve, and the second regulating valve 5 is set as a high pressure regulating valve. The flow rate of the first regulating valve 6 is greater than that of the second regulating valve 5. The first solenoid valve 7a and the second solenoid valve 7b are two valve components of a double solenoid valve 7. The calibration valve 9 is CNC-controlled. The electro-hydraulic valve, calibration valve 9, can respond to the quantitative pressure control signal sent by the control module. When the system needs to perform oil pressure calibration, calibration valve 9 receives the quantitative pressure control signal and controls the magnitude of the input calibration oil pressure according to the pressure adjustment amount required by the quantitative pressure control signal, thereby correcting the oil pressure fluctuation. Since the function of calibration oil pump 8 is to compensate for the oil pressure output by power oil pump 1, calibration oil pump 8 adopts a low-power, low-flow oil pump. Its function is to provide a certain calibration pressure value when the hydraulic press performs oil pressure calibration.

[0046] The specific adjustment of the output working oil pressure in the high / low pressure state of the system is as follows: When the hydraulic press pressure oil pressure adjustment system adjusts the working pressure state of the hydraulic press, if the hydraulic press is in standby state, the first solenoid valve 7a and the second solenoid valve 7b are not energized and are in the open state. At this time, the four points A, B, C and D in the oil circuit are all connected, and the hydraulic oil flows out from the power oil pump 1 and flows directly to the first return oil chamber 3 through the hydraulic valve 4. No hydraulic oil enters the return cylinder, so that the hydraulic press is in the zero pressure state.

[0047] When the hydraulic press is working, if the hydraulic press is performing the main slide downward or pressing step, it needs to output high oil pressure. At this time, the first solenoid valve 7a is energized and activated, and the points B, C and D in the oil circuit are disconnected from each other. The hydraulic oil flows out from the power oil pump 1, flows through the main oil port of the hydraulic valve 4 to the oil port of the hydraulic valve 4, and then flows to the second regulating valve 5. After passing through the second regulating valve 5, it flows into the control oil port of the hydraulic valve 4. The oil pressure output by the power oil pump 1 is basically all input into the return cylinder. If it is necessary to adjust the working oil pressure inside the return cylinder under high pressure, it is only necessary to adjust the flow rate of the second regulating valve 5 and the oil port of the hydraulic valve 4.

[0048] After the hydraulic press finishes pressing, the slide returns to its original position, or when the hydraulic press needs to change molds, the hydraulic press requires a lower working oil pressure. At this time, the second solenoid valve 7b is activated, and the first solenoid valve 7a is deactivated. Point D in the oil circuit is disconnected from points C and B, while point C is connected to point B. Hydraulic oil flows out from the power oil pump 1, passes through hydraulic valve 4, and flows simultaneously to the first regulating valve 6 and the second regulating valve 5. Since the flow rate of the first regulating valve 6 is greater than that of the second regulating valve 5, most of the hydraulic oil will flow into the first return oil chamber 3 through points C and B. The amount of hydraulic oil flowing into the return cylinder through hydraulic valve 4 is reduced, the oil pressure inside the return cylinder decreases, and the hydraulic press is in a low-pressure working state. The adjustment of the working oil pressure inside the return cylinder in the low-pressure state can be accomplished by adjusting the two regulating valves.

[0049] The regulating oil pump in the calibration oil circuit provides calibration oil pressure to the hydraulic press. When the hydraulic press is working, a pressure sensor is installed on the inner wall of the working cylinder of the hydraulic press, so that the pressure sensor can monitor the internal pressure value of the hydraulic press in real time and obtain the real-time pressure value when the hydraulic press is working. Based on the obtained real-time pressure value, the pressure-time function of the hydraulic press is derived, that is, the real-time working curve of the hydraulic press. The pressure value of the real-time working curve of the hydraulic press is compared with the pressure standard value entered by the operator, and the pressure difference between the two is calculated to obtain the pressure difference curve. Based on the pressure difference, the required flow rate of the calibration valve 9 is obtained by referring to the preset pressure-flow reference table, and the differential flow curve is obtained. The pressure-flow reference table can be obtained by the operator through experimentation or calculation. Based on the differential flow curve, the hydraulic oil continuously input to the working cylinder of the hydraulic press is controlled by the calibration valve 9. By adjusting the time difference of the hydraulic oil input by delay, the pressure difference curve corresponding to the differential flow curve is fitted with the real-time working curve. When the hydraulic press is working, the internal working pressure tends to the pressure standard value, so that the pressure difference is less than the preset standard deviation value.

[0050] The implementation principle of the hydraulic press pressure regulating system in this application embodiment is as follows: By controlling the on / off states of the first solenoid valve 7a and the second solenoid valve 7b, the flow of hydraulic oil in the oil circuit is controlled. Under different pressure demand scenarios, the hydraulic oil flows in different oil circuits, causing the amount of hydraulic oil ultimately leading directly to the return cylinder to change, thereby altering the working oil pressure value inside the return cylinder. The added correction oil circuit detects the working pressure inside the return cylinder to obtain the real-time working pressure of the hydraulic press, and then calculates the required correction oil pressure value to achieve the ideal working state of the hydraulic press. The correction valve 9 is then controlled to correct the oil pressure value inside the return cylinder.

[0051] This application also discloses a method for regulating the pressure of hydraulic press oil. (Refer to...) Figure 2 A method for regulating hydraulic press oil pressure includes the following steps:

[0052] S201: Acquire pressure information entered by personnel through the control module;

[0053] Specifically, depending on the required pressure value for each step in the working stroke of the hydraulic press, the operator can input pressure information into the control module. For example, if the hydraulic press requires a larger pressure value during the pressing process, the operator can input the specific pressure information through the control module. This input process can be completed via keyboard and mouse or via touchpad.

[0054] S202: Determine whether the pressure information is high oil pressure information based on the preset pressure standard;

[0055] Specifically, the preset pressure standard needs to be set according to the actual working pressure range of the hydraulic press. For example, the first 30% of the working pressure range of the hydraulic press can be set as high pressure. When the pressure value corresponding to the input pressure information is within the first 30% of the working pressure range of the hydraulic press, it is judged as a high oil pressure control signal.

[0056] S2021: Control the first solenoid valve 7a to open so that the hydraulic oil flows through the hydraulic valve 4 to the second regulating valve 5, and then flows through the opened oil circuit to the second return oil chamber 2 connected to the oil outlet of the second regulating valve 5, thereby increasing the working pressure inside the hydraulic press.

[0057] S2022: Control the first solenoid valve 7a to close and the second solenoid valve 7b to open so that hydraulic oil flows through hydraulic valve 4 to both the first regulating valve 6 and the second regulating valve 5. The hydraulic oil flows through the opened oil circuit to the first return oil chamber 3 connected to the oil outlet of the double solenoid valve 7, and the other part flows to the second return oil chamber 2 connected to the oil outlet of the second regulating valve 5, thereby reducing the internal working pressure of the hydraulic press.

[0058] Specifically, depending on the result of S202, S2021 or S2022 is executed. If the control signal is determined to be a high oil pressure control signal, S2021 is executed to make the hydraulic press work in a high oil pressure state; if the control signal is determined not to be a high oil pressure control signal, S2022 is executed to make the hydraulic press work in a low oil pressure state.

[0059] Reference Figure 3 A hydraulic press pressure oil pressure regulation method also includes an oil pressure calibration step, comprising the following steps:

[0060] S301: Obtain the real-time pressure value inside the working cylinder during one working stroke of the hydraulic press using a pressure sensor;

[0061] Specifically, the pressure sensor is installed on the inner wall of the hydraulic press working cylinder, which can detect the real-time pressure value inside the working cylinder. The model of the pressure sensor can be selected by those skilled in the art based on the working pressure range inside the hydraulic press, and will not be elaborated here.

[0062] S302: The real-time working curve of the hydraulic press is obtained from the real-time pressure value inside the working cylinder during one working stroke of the hydraulic press. The real-time working curve is a pressure-time function curve.

[0063] Specifically, the pressure sensor detects the pressure value inside the hydraulic press's working cylinder and plots a pressure-time function as the real-time working curve of the hydraulic press. The pressure sensor detects at 1ms intervals and records the data in real time from the start of the hydraulic press's operation. The pressure-time function is then fitted to several data points.

[0064] S303: Compare the pressure values ​​at each time point of the real-time working curve with the pressure information entered by the personnel, and calculate the difference between the two;

[0065] Specifically, a comparison can be performed at 5ms intervals. The pressure value that the operator inputs for the hydraulic press to work is used as the comparison standard. The difference between the calculated real-time working curve and the input pressure standard value is obtained, and the calculation result is used as the standard for subsequent oil pressure correction.

[0066] S304: Generate a pressure correction signal based on the difference between the two;

[0067] Specifically, the pressure difference between the two is calculated to obtain the pressure difference curve. Based on the pressure difference, the required flow rate of the correction valve 9 is determined by referring to the preset pressure-flow reference table, and the differential flow curve is obtained. The pressure-flow reference table can be obtained by personnel through experiments or calculations. Based on the differential flow curve, the hydraulic oil continuously input to the hydraulic press working cylinder by the correction valve 9 is controlled. By adjusting the time difference of hydraulic oil input through delay, the pressure difference curve corresponding to the differential flow curve is fitted with the real-time working curve. When the hydraulic press is working, the internal working pressure tends to the pressure standard value, so that the pressure difference is less than the preset standard deviation value.

[0068] S305: Convert the pressure correction signal into a flow opening signal according to a preset pressure-flow reference table;

[0069] Specifically, the calibration valve 9 adopts a CNC electro-hydraulic valve. When the calibration valve 9 receives a quantitative pressure control signal, it controls the flow opening size of the calibration valve 9 according to the required calibration pressure value contained in the pressure control signal. The calibration valve 9 opens the corresponding flow and inputs calibration oil pressure to the working cylinder to adjust the real-time working status of the working cylinder, so that the internal pressure of the hydraulic press working cylinder tends to be stable.

[0070] S306: Control the opening flow of the correction valve 9 according to the flow opening signal to complete the oil pressure correction;

[0071] Specifically, the calibration oil pressure is input into the hydraulic press through the calibration valve 9. Since the real-time pressure value inside the hydraulic press changes instantaneously, the calibration oil pressure is input using a delayed input method. Through curve fitting, the pressure difference is reduced, and the real-time pressure value gradually becomes stable.

[0072] The implementation principle of the calibration step in the hydraulic press pressure regulation method of this application embodiment is as follows:

[0073] The output oil pressure of a hydraulic press powered by a piston pump is closely related to the flow pulsation curve of the piston pump. The piston pump contains multiple moving pistons, each reciprocating within a cycle. The flow pulsation curve of a single piston is a sinusoidal function, but the movements of each piston are not synchronous. Therefore, there is a phase shift between the flow pulsation curves of multiple pistons. This means the flow pulsation curve of the piston pump is the non-overlapping portion of the flow pulsation curves of each piston. This results in an unstable output pressure value for the hydraulic press powered by the piston pump in actual operation. Furthermore, due to actual production conditions, the flow pulsation curve of the piston pump is not smooth and contains many fluctuations and imperfections, which also leads to unstable oil pressure input from the piston pump to the hydraulic press. By acquiring the real-time pressure value of the hydraulic press during operation through a pressure sensor, calculating the difference between the real-time pressure value and the standard pressure, and generating a quantitative control signal to adjust and correct the internal pressure value of the hydraulic press using valve 9, the output pressure of the hydraulic press tends to be stable.

[0074] This application also discloses a computer-readable storage medium.

[0075] Specifically, the computer-readable storage medium stores a computer program that can be loaded by a processor and executed, such as the hydraulic press pressure oil pressure regulation method described above. The computer-readable storage medium includes, for example, various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0076] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hydraulic press pressure regulating system, characterized in that: It includes a power oil pump (1), two oil circuits and an oil tank. The oil tank contains a first return oil chamber (3). One end of each of the two oil circuits is connected to the oil outlet of the power oil pump (1), and the other end is used to connect to the two oil chambers of the return cylinder. The oil outlet of the power oil pump (1) is provided with a high-low pressure switching module (12). The high-low pressure switching module (12) includes a hydraulic valve (4), a first regulating valve (6), a second regulating valve (5), and a double solenoid valve (7). The double solenoid valve (7) includes two valve components, respectively... The first solenoid valve (7a) and the second solenoid valve (7b) are connected; the main oil port of the hydraulic valve (4) is connected to the oil outlet of the power oil pump (1), the control oil port of the hydraulic valve (4) is connected to the oil outlet of the second regulating valve (5), the oil passage of the hydraulic valve (4) is connected to the oil inlet of the first regulating valve (6), the second regulating valve (5) and the first solenoid valve (7a), the oil outlet of the first regulating valve (6) is connected to the oil inlet of the second solenoid valve (7b), and the oil outlet of the second solenoid valve (7b) is connected to the first return oil chamber (3) for oil storage; It also includes a control module, which is used to control the hydraulic valve (4), the first regulating valve (6), the second regulating valve (5), and the double solenoid valve (7). The double solenoid valve (7) is connected to the control module and is controlled by the control module. The hydraulic press pressure oil regulating system is used to: acquire the pressure information entered by the personnel through the control module, and determine whether the pressure information is high oil pressure information according to the preset pressure standard; if so, control the first solenoid valve (7a) to open so that the hydraulic oil flows through the hydraulic valve (4) to the second regulating valve (5), and then flows through the opened oil circuit to the second return oil chamber (2) connected to the oil outlet of the second regulating valve (5), so as to increase the working pressure inside the hydraulic press.

2. The hydraulic press pressure regulating system according to claim 1, characterized in that: It also includes an oil pressure correction circuit, which includes a regulating oil pump and a correction valve (9). The oil inlet of the correction valve (9) is connected to the oil outlet of the regulating oil pump, and the oil outlet of the correction valve (9) is connected to the return cylinder B chamber, which leads to the return cylinder and is used to control the extension of the return cylinder.

3. The hydraulic press pressure regulating system according to claim 1, characterized in that: The oil tank also includes a second oil return chamber (2), and the oil outlet of the second regulating valve (5) is connected to the oil control port of the hydraulic valve (4).

4. The hydraulic press pressure regulating system according to claim 1, characterized in that: The calibration valve (9) is a CNC electro-hydraulic valve. The first regulating valve (6) and the second regulating valve (5) are both pressure regulating valves to regulate the input oil pressure. The calibration valve (9), the first regulating valve (6) and the second regulating valve (5) are coupled to the control module and controlled by the control module.

5. The hydraulic press pressure regulating system according to claim 1, characterized in that: The flow rate of the first regulating valve (6) is greater than that of the second regulating valve (5).

6. A method for regulating hydraulic press pressure in a hydraulic press pressure regulating system according to any one of claims 1 to 5, characterized in that, Includes the following steps: Acquire pressure information entered by personnel through the control module; Based on the preset pressure standard, determine whether the pressure information is high oil pressure information; If so, the first solenoid valve (7a) is opened so that the hydraulic oil flows through the hydraulic valve (4) to the second regulating valve (5), and then flows through the opened oil circuit to the second return oil chamber (2) connected to the oil outlet of the second regulating valve (5), thereby increasing the working pressure inside the hydraulic press.

7. The hydraulic press pressure regulating method according to claim 6, after determining whether the pressure information is high oil pressure information, further includes the following step: If not, the first solenoid valve (7a) is closed and the second solenoid valve (7b) is opened so that the hydraulic oil flows through the hydraulic valve (4) to both the first regulating valve (6) and the second regulating valve (5). The hydraulic oil flows through the opened oil circuit to the first return oil chamber (3) connected to the oil outlet of the double solenoid valve (7), and the other part flows to the second return oil chamber (2) connected to the oil outlet of the second regulating valve (5), thereby reducing the working pressure inside the hydraulic press.

8. The hydraulic press pressure regulating method according to claim 6, characterized in that, It also includes the following steps: The real-time pressure value inside the working cylinder during one working stroke of the hydraulic press is obtained by a pressure sensor; The real-time working curve of the hydraulic press is derived from the real-time pressure value inside the working cylinder during one working stroke of the hydraulic press. The real-time working curve is a pressure-time function curve. The pressure values ​​at each time point of the real-time working curve are compared with the pressure information entered by the personnel, and the difference between the two is calculated. A pressure correction signal is generated based on the difference between the two. The pressure correction signal is converted into a flow opening signal according to a preset pressure-flow reference table; The oil pressure is corrected by controlling the opening flow of the correction valve (9) according to the flow opening signal.

9. A computer-readable storage medium, characterized in that, The computer program is stored that can be loaded by a processor and executed according to any one of the methods of claims 6 to 8.

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