Energy storage type servo hydraulic high-speed proportional loading hydraulic system

Abstract

The utility model provides an energy storage type servo hydraulic high-speed proportional loading hydraulic system which is characterized in that an inlet of a high-pressure electric pump set is connected with an oil tank, and an outlet of the high-pressure electric pump set is connected with a first high-pressure electromagnetic valve and a pressure reducing valve through a first one-way valve and a filtering module; an energy accumulator group and a pilot pressure regulating energy accumulator are connected behind the first high-pressure electromagnetic valve; the energy accumulator group is connected with a rod cavity of the loading hydraulic cylinder through a proportional servo pilot valve; the pilot pressure regulating energy accumulator is connected with the control end of the proportional servo pilot valve; the pressure reducing valve is connected with the loading hydraulic cylinder through a three-position four-way electromagnetic valve and a hydraulic lock; and a proportional overflow valve and a loading cylinder buffer overflow valve are arranged between the hydraulic lock and the loading hydraulic cylinder. When the large-flow proportional servo valve is used for loading, the opening degree of the large-flow proportional servo valve is accurately controlled, high-pressure oil stored in the energy accumulator set is rapidly released in a proportional mode, then the loading hydraulic cylinder is driven to achieve large-load acceleration traction, and the analog loading speed is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic energy storage, and particularly relates to an energy storage type servo hydraulic high-speed proportional loading hydraulic system. Background Technique

[0002] During the reliability inspection, maintenance or test of aviation equipment, loading equipment is required for loading tests. The loading hydraulic cylinder in the loading equipment needs to be driven and controlled by a loading hydraulic system. During the specific loading test, it is necessary to drive the loading hydraulic cylinder to achieve accelerated traction of large loads in order to simulate the loading speed. Content of the Utility Model

[0003] The purpose of the utility model is to provide an energy storage type servo hydraulic high-speed proportional loading hydraulic system. This hydraulic system adopts hydraulic energy storage technology. The small-power motor pump group in the system pressurizes and stores energy in the accumulator group. When used for loading, by precisely controlling the opening of the large-flow proportional servo valve, the high-pressure stored oil in the accumulator group is proportionally and quickly released, and then the loading hydraulic cylinder is driven to achieve accelerated traction of large loads in order to simulate the loading speed.

[0004] In order to achieve the above technical features, the purpose of the utility model is realized as follows: An energy storage type servo hydraulic high-speed proportional loading hydraulic system includes a high-pressure electric pump group. The inlet of the high-pressure electric pump group is connected to the fuel tank, and the outlet of the high-pressure electric pump group is connected to a first one-way valve, a filtration module, a first high-pressure solenoid valve and a pressure reducing valve through the first one-way valve;

[0005] After the first high-pressure solenoid valve, an accumulator group and a pilot pressure regulating accumulator are connected. The accumulator group is connected to the rod chamber of the loading hydraulic cylinder through a proportional servo pilot valve; the pilot pressure regulating accumulator is connected to the control end of the proportional servo pilot valve;

[0006] The pressure reducing valve is connected to the loading hydraulic cylinder through a three-position four-way solenoid valve and a hydraulic lock;

[0007] A proportional overflow valve and a loading cylinder buffer overflow valve are installed between the hydraulic lock and the loading hydraulic cylinder.

[0008] The filtration module includes an oil suction filter, a first-stage high-pressure oil filter, a second-stage high-pressure oil filter and a return oil filter; the oil suction filter is installed at the inlet end of the high-pressure electric pump group; the first-stage high-pressure oil filter and the second-stage high-pressure oil filter are installed in series between the one-way valve and the first high-pressure solenoid valve; the return oil filter is installed on the return oil pipeline; a radiator is installed on the return oil pipeline and before the return oil filter.

[0009] A system safety valve for limiting the maximum pressure of the system is installed on the pipeline between the first one-way valve and the first high-pressure solenoid valve, and the other end of the system safety valve is connected to the radiator on the return oil pipeline.

[0010] The pressure reducing valve is used to adjust the commissioning pressure and the loading reset pressure of the loading hydraulic cylinder;

[0011] The high-pressure electric pump unit selects a variable-frequency motor pump unit, which can adjust the output flow of the pump unit in real time to control the commissioning operation speed of the loading hydraulic cylinder;

[0012] The three-position four-way solenoid valve is used for reversing the commissioning / reset oil circuit of the loading hydraulic cylinder;

[0013] The filtration accuracies of the filtration module are as follows: the suction oil filter is 10μm, the first-stage high-pressure oil filter is 5μm, the second-stage high-pressure oil filter is 3μm, and the return oil filter is 20μm.

[0014] It also includes a pressure monitoring system, which includes a first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor; the first pressure sensor is installed on the pipeline between the first high-pressure solenoid valve and the accumulator bank; the second pressure sensor is installed on the pipeline between the pilot pressure regulating accumulator and the proportional servo pilot valve; the third pressure sensor is installed on the pipeline between the proportional servo pilot valve and the loading hydraulic cylinder; the fourth pressure sensor is installed on the pipeline between the hydraulic lock and the loading hydraulic cylinder.

[0015] The pilot pressure regulating accumulator is connected to the proportional servo pilot valve through a pilot pressure relief valve and a second high-pressure solenoid valve;

[0016] The charging, releasing and unloading of the accumulator bank are controlled by the opening and closing of the first high-pressure solenoid valve, the second high-pressure solenoid valve and the proportional servo pilot valve;

[0017] The proportional overflow valve is used for proportional control of the oil circuit flow path of the buffer cylinder oil when the accumulator bank loads the loading hydraulic cylinder. When the loading hydraulic cylinder accelerates the loading, the opening of the proportional overflow valve is automatically controlled to increase proportionally to reduce the flow resistance of the return oil buffer. When the loading ends and the loading hydraulic cylinder buffers and decelerates, the opening synchronously decreases to increase the return oil buffer pressure and realize the reverse braking of the loading hydraulic cylinder.

[0018] A low-level sensor, a temperature sensor, an air filter and a liquid level gauge are installed inside the fuel tank.

[0019] The utility model has the following beneficial effects:

[0020] 1. The hydraulic system of the loading equipment of the utility model mainly adopts hydraulic energy storage technology. The small-power motor pump unit in the system charges and stores energy in the accumulator bank. When used for loading, the system precisely controls the opening of the large-flow proportional servo valve to proportionally and quickly release the high-pressure stored oil in the accumulator bank, and then drives the loading hydraulic cylinder to achieve the accelerated traction of large loads to reach the simulated loading speed.

[0021] 2. The utility model has two main functions through the high-pressure electric pump group. One is to charge and store energy for the accumulator group and the pilot pressure-regulating accumulator, and the other is to prepare for the stroke debugging of the loading hydraulic cylinder and the loading position of the piston rod before loading. The system selects a variable-frequency motor pump group, which can adjust the output flow of the pump group in real time to control the debugging operation speed of the cylinder.

[0022] 3. The filtering module can be used for filtering the oil in the hydraulic system.

[0023] 4. The system safety valve is used to limit the maximum pressure of the system, that is, to limit the maximum pressure for charging and storing energy in the accumulator group, thereby ensuring the safety of the system.

[0024] 5. The pressure reducing valve is used to adjust the debugging pressure and the loading and resetting pressure of the loading hydraulic cylinder.

[0025] 6. The three-position four-way solenoid valve is used to change the direction of the debugging / reset oil circuit of the loading hydraulic cylinder.

[0026] 7. The proportional overflow valve is used for proportional control of the oil circuit flow path of the buffer cylinder oil when the accumulator group loads the loading hydraulic cylinder. When the hydraulic cylinder accelerates loading, the opening of the proportional overflow valve is automatically controlled to increase proportionally to reduce the flow resistance of the return oil buffer. When the loading ends and the hydraulic cylinder buffers and decelerates, the opening synchronously decreases to increase the return oil buffer pressure and achieve the reverse braking of the hydraulic cylinder.

[0027] 8. The loading cylinder buffer overflow valve is used to mechanically limit the reverse braking buffer pressure of the hydraulic cylinder. Brief Description of the Drawings

[0028] The following further describes the utility model in conjunction with the drawings and embodiments.

[0029] Figure 1 It is the hydraulic system diagram of the utility model.

[0030] Figure 2 It is the charging control process diagram of the accumulator group of the utility model.

[0031] Figure 3 It is the release and pressurization control process diagram of the accumulator group of the utility model.

[0032] Figure 4 It is the debugging / loading and reset control process diagram of the loading hydraulic cylinder of the utility model.

[0033] Figure 5 It is the unloading control process diagram of the accumulator group of the utility model.

[0034] In the figure: 1. Oil suction filter; 2. High-pressure electric pump unit; 3. First check valve; 4. First-stage high-pressure oil filter; 5. Second-stage high-pressure oil filter; 6. Pressure reducing valve; 7. First high-pressure solenoid valve; 8. First pressure sensor; 9. Accumulator group; 10. Three-position four-way solenoid valve; 11. System safety valve; 12. Low liquid level sensor; 13. Temperature sensor; 14. Air filter; 15. Liquid level gauge; 16. Return oil filter; 17. Radiator; 18. Hydraulic lock; 19. Second check valve; 20. Pilot pressure regulating accumulator; 21. Second pressure sensor; 22. Pilot pressure relief valve; 23. Second high-pressure solenoid valve; 24. Proportional servo pilot valve; 25. Third pressure sensor; 26. Loading hydraulic cylinder; 27. Fourth pressure sensor; 28. Proportional overflow valve; 29. Loading cylinder buffer overflow valve. Detailed implementation manners

[0035] The following further describes the implementation manners of the present utility model in conjunction with the accompanying drawings.

[0036] Embodiment 1:

[0037] Refer to Figures 1-5 , a energy storage type servo hydraulic high-speed proportional loading hydraulic system, including a high-pressure electric pump unit 2, the inlet of the high-pressure electric pump unit 2 is connected to the fuel tank, and the outlet of the high-pressure electric pump unit 2 is connected to the first high-pressure solenoid valve 7 and the pressure reducing valve 6 through the first check valve 3 and the filtration module; after the first high-pressure solenoid valve 7, an accumulator group 9 and a pilot pressure regulating accumulator 20 are connected, the accumulator group 9 is connected to the rodless cavity of the loading hydraulic cylinder 26 through the proportional servo pilot valve 24; the pilot pressure regulating accumulator 20 is connected to the control end of the proportional servo pilot valve 24; the pressure reducing valve 6 is connected to the loading hydraulic cylinder 26 through the three-position four-way solenoid valve 10 and the hydraulic lock 18; a proportional overflow valve 28 and a loading cylinder buffer overflow valve 29 are installed between the hydraulic lock 18 and the loading hydraulic cylinder 26. This hydraulic system adopts hydraulic energy storage technology, pressurizes and stores energy in the accumulator group through a small-power motor pump group in the system, and when used for loading, by precisely controlling the opening of the large-flow proportional servo valve, the high-pressure stored oil in the accumulator group is proportionally and quickly released, thereby driving the loading hydraulic cylinder to achieve the accelerated traction of a large load to reach the simulated loading speed.

[0038] Further, the filtration module includes an oil suction filter 1, a first-stage high-pressure oil filter 4, a second-stage high-pressure oil filter 5 and a return oil filter 16; the oil suction filter 1 is installed at the inlet end of the high-pressure electric pump unit 2; the first-stage high-pressure oil filter 4 and the second-stage high-pressure oil filter 5 are installed in series between the check valve 3 and the first high-pressure solenoid valve 7; the return oil filter 16 is installed on the return oil pipeline; a radiator 17 is installed on the return oil pipeline and before the return oil filter 16. The above filtration module can be used to effectively filter the oil in the system.

[0039] Further, a system safety valve 11 for restricting the maximum pressure of the system is installed on the pipeline between the first one-way valve 3 and the first high-pressure solenoid valve 7, and the other end of the system safety valve 11 is connected to the radiator 17 on the oil return pipeline. That is, the maximum pressure for charging and energy storage of the accumulator group 9 is restricted, thus ensuring the safety of the system.

[0040] Further, the pressure reducing valve 6 is used to adjust the commissioning pressure and the loading reset pressure of the loading hydraulic cylinder.

[0041] Further, the high-pressure electric pump group 2 is a variable-frequency motor pump group, which can adjust the output flow of the pump group in real time to control the commissioning operation speed of the loading hydraulic cylinder 26.

[0042] Further, the three-position four-way solenoid valve 10 is used for reversing the commissioning / reset oil circuit of the loading hydraulic cylinder 26. Thus, the action of the loading hydraulic cylinder 26 is controlled.

[0043] Further, the filtration accuracies of the filtration module are as follows: the suction oil filter 1 is 10μm, the first-stage high-pressure oil filter 4 is 5μm, the second-stage high-pressure oil filter 5 is 3μm, and the oil return filter 16 is 20μm. The above filtration accuracies ensure the oil filtration effect.

[0044] Further, it further includes a pressure monitoring system, and the pressure monitoring system includes a first pressure sensor 8, a second pressure sensor 21, a third pressure sensor 25 and a fourth pressure sensor 27; the first pressure sensor 8 is installed on the pipeline between the first high-pressure solenoid valve 7 and the accumulator group 9; the second pressure sensor 21 is installed on the pipeline between the pilot pressure regulating accumulator 20 and the proportional servo pilot valve 24; the third pressure sensor 25 is installed on the pipeline between the proportional servo pilot valve 24 and the loading hydraulic cylinder 26; the fourth pressure sensor 27 is installed on the pipeline between the hydraulic lock 18 and the loading hydraulic cylinder 26. The above pressure monitoring system ensures the pressure display during the operation of the system, thus ensuring the safety of the system operation.

[0045] Further, the pilot pressure regulating accumulator 20 is connected to the proportional servo pilot valve 24 through a pilot pressure relief valve 22 and a second high-pressure solenoid valve 23; the opening and closing of the first high-pressure solenoid valve 7, the second high-pressure solenoid valve 23 and the proportional servo pilot valve 24 are used to control the charging, release and unloading of the accumulator group. By controlling the proportional servo pilot valve 24 through the above pilot pressure regulating accumulator 20, and controlling the high-pressure oil supply of the accumulator group 9 through the proportional servo pilot valve 24, the high-pressure oil released by the accumulator group 9 can be smoothly and continuously loaded into the rod chamber of the loading hydraulic cylinder 26, realizing the continuous acceleration of the high-speed loading device.

[0046] Further, the proportional overflow valve 28 is used for proportional control of the oil passage flow diameter of the buffer cylinder oil during the loading of the accumulator group 9 to the loading hydraulic cylinder 26. When the loading hydraulic cylinder 26 accelerates the loading, the opening of the proportional overflow valve 28 is automatically controlled to increase proportionally to reduce the flow resistance of the oil return buffer. When the loading ends and the loading hydraulic cylinder 26 buffers and decelerates, the opening synchronously decreases to increase the oil return buffer pressure, realizing the reverse braking of the loading hydraulic cylinder 26.

[0047] Further, a low-level sensor 12, a temperature sensor 13, an air filter 14, and a liquid level gauge 15 are installed inside the fuel tank. The safety of the fuel tank is ensured by the above-mentioned accessories.

[0048] Embodiment 2:

[0049] See Figures 2-5 , an operation method of an energy storage type servo hydraulic high-speed proportional loading hydraulic system, which is realized by using the energy storage type servo hydraulic high-speed proportional loading hydraulic system, and includes the following operation conditions:

[0050] Pressurization control of the accumulator group:

[0051] It is used to pressurize the accumulator group 9 and limit the maximum pressure of the system through the system safety valve 11;

[0052] Release and pressurization control of the accumulator group:

[0053] When the accumulator group 9 releases high-pressure oil to pressurize the loading hydraulic cylinder 26, the loading flow is controlled by a large-flow proportional servo pilot valve 24, so that the high-pressure oil released by the accumulator group 9 can be stably and continuously loaded into the rodless cavity of the loading hydraulic cylinder 26, realizing the continuous acceleration of the high-speed loading device;

[0054] Debugging / loading reset control of the loading hydraulic cylinder:

[0055] The oil circuit switching for debugging the loading hydraulic cylinder 26 and resetting the piston rod loading is switched by a three-position four-way solenoid valve 10, and is coordinated with the proportional flow control of the variable-frequency motor of the high-pressure electric pump group to adjust the running speed of the piston rod in real time;

[0056] Unloading control of the accumulator group:

[0057] The unloading of the accumulator group is realized through a dedicated second high-pressure solenoid valve 23. In order to prevent high-pressure oil from existing in the accumulator group during unloading, a throttling device is set in the unloading oil circuit to separately limit the high-pressure oil of the accumulator group to prevent the high-pressure oil from unloading to the fuel tank instantaneously and in a large flow.

[0058] Embodiment 3:

[0059] See Figure 2, the specific process of the pressurization control of the accumulator group is as follows:

[0060] Pump oil through the high-pressure electric pump group 2, and the high-pressure oil sequentially passes through the high-pressure electric pump group 2, the first one-way valve 3, the first-stage high-pressure oil filter 4, the second-stage high-pressure oil filter 5, and the first high-pressure solenoid valve 7 and is filled into the accumulator group 9 and the pilot pressure-regulating accumulator 20. During the pressurization process, the system pressure is limited by the system safety valve 11;

[0061] Embodiment 4:

[0062] See Figure 3 , the specific process of the release and pressurization control of the accumulator group is as follows:

[0063] Release high-pressure oil through the accumulator group 9. The high-pressure oil enters the rod chamber of the loading hydraulic cylinder 26 through the proportional servo pilot valve 24, and the proportional servo pilot valve 24 is controlled by the pilot pressure-regulating accumulator 20. The high-pressure oil supply of the accumulator group 9 is controlled by the proportional servo pilot valve 24, so that the high-pressure oil released by the accumulator group 9 can be stably and continuously loaded into the rod chamber of the loading hydraulic cylinder 26, realizing the continuous acceleration of the high-speed loading device.

[0064] Embodiment 5:

[0065] See Figure 4 , the specific process of the debugging / loading reset control of the loading hydraulic cylinder is as follows:

[0066] Pump oil through the high-pressure electric pump group 2, and the high-pressure oil sequentially passes through the high-pressure electric pump group 2, the first one-way valve 3, the first-stage high-pressure oil filter 4, the second-stage high-pressure oil filter 5, and the pressure reducing valve 6 and enters the three-position four-way solenoid valve 10. The debugging / loading reset control of the loading hydraulic cylinder 26 is controlled by the switching of the three-position four-way solenoid valve 10. At the same time, through the proportional flow control of the high-pressure electric pump group 2, the running speed of the piston rod is adjusted in real time;

[0067] Embodiment 6:

[0068] See Figure 5 , the specific process of the unloading control of the accumulator group is as follows:

[0069] When it is necessary to unload the accumulator group 9, the unloading process is controlled by the second high-pressure solenoid valve 23, and a throttling device is provided in the unloading oil circuit to separately limit the flow of the high-pressure oil of the accumulator group 9, thereby preventing the high-pressure oil from unloading to the fuel tank instantaneously and in a large flow rate.

Claims

1. An energy storage servo hydraulic high-speed proportional loading hydraulic system, characterized in that: It comprises a high-pressure electric pump group (2), wherein the inlet of the high-pressure electric pump group (2) is connected to the oil tank, and the outlet of the high-pressure electric pump group (2) is connected to the first high-pressure electromagnetic valve (7) and the pressure reducing valve (6) via a first one-way valve (3) and a filter module; An accumulator group (9) and a pilot pressure regulating accumulator (20) are connected after the first high-pressure solenoid valve (7); the accumulator group (9) is connected to a rod chamber of a loading hydraulic cylinder (26) via a proportional servo pilot valve (24); the pilot pressure regulating accumulator (20) is connected to a control end of the proportional servo pilot valve (24); The pressure reducing valve (6) is connected to the loading hydraulic cylinder (26) via a three-position four-way solenoid valve (10) and a hydraulic lock (18); A proportional overflow valve (28) and a loading cylinder buffer overflow valve (29) are installed between the hydraulic lock (18) and the loading hydraulic cylinder (26).

2. According to claim 1, an energy storage servo hydraulic high-speed proportional loading hydraulic system is characterized in that: The filter module comprises an oil suction filter (1), a primary high-pressure oil filter (4), a secondary high-pressure oil filter (5) and an oil return filter (16); the oil suction filter (1) is installed at the inlet end of the high-pressure electric pump group (2); the primary high-pressure oil filter (4) and the secondary high-pressure oil filter (5) are installed in series between the one-way valve (3) and the first high-pressure solenoid valve (7); the oil return filter (16) is installed on the oil return pipeline; and a radiator (17) is installed on the oil return pipeline and before the oil return filter (16).

3. According to claim 2, an energy storage servo hydraulic high-speed proportional loading hydraulic system is characterized in that: A system safety valve (11) for limiting the maximum pressure of the system is installed on the pipeline between the first one-way valve (3) and the first high-pressure solenoid valve (7), and the other end of the system safety valve (11) is connected to a radiator (17) on the oil return pipeline.

4. According to claim 2, an energy storage servo hydraulic high-speed proportional loading hydraulic system is characterized in that: The pressure reducing valve (6) is used to adjust the debugging pressure and the loading reset pressure of the loading hydraulic cylinder; The high-pressure electric pump group (2) uses a variable frequency motor pump group, which can adjust the output flow of the pump group in real time and thus control the debugging operation speed of the loading hydraulic cylinder (26); The three-position four-way solenoid valve (10) is used for debugging / resetting the oil circuit switching of the loading hydraulic cylinder (26); The filtering accuracies of the filtering modules are: the oil suction filter (1) is 10 μm, the first-stage high-pressure oil filter (4) is 5 μm, the second-stage high-pressure oil filter (5) is 3 μm, and the return oil filter (16) is 20 μm.

5. According to claim 1, the energy storage servo hydraulic high-speed proportional loading hydraulic system is characterized by: The invention also comprises a pressure monitoring system, wherein the pressure monitoring system comprises a first pressure sensor (8), a second pressure sensor (21), a third pressure sensor (25) and a fourth pressure sensor (27); the first pressure sensor (8) is installed on the pipeline between the first high-pressure solenoid valve (7) and the accumulator group (9); the second pressure sensor (21) is installed on the pipeline between the pilot pressure regulating accumulator (20) and the proportional servo pilot valve (24); the third pressure sensor (25) is installed on the pipeline between the proportional servo pilot valve (24) and the loading hydraulic cylinder (26); and the fourth pressure sensor (27) is installed on the pipeline between the hydraulic lock (18) and the loading hydraulic cylinder (26).

6. The energy storage servo hydraulic high-speed proportional loading hydraulic system according to claim 1, characterized in that: The pilot pressure regulating accumulator (20) is connected to the proportional servo pilot valve (24) via a pilot pressure relief valve (22) and a second high-pressure solenoid valve (23); The first high-pressure solenoid valve (7), the second high-pressure solenoid valve (23) and the proportional servo pilot valve (24) are opened and closed to control the charging, releasing and unloading of the accumulator group; The proportional relief valve (28) is used for proportional control of the oil passage diameter of the buffer cylinder oil when the accumulator group (9) loads the loading hydraulic cylinder (26). When the loading hydraulic cylinder (26) accelerates loading, the opening of the proportional relief valve (28) is automatically controlled to increase in proportion to reduce the flow resistance of the return oil buffer. When loading is completed and the loading hydraulic cylinder (26) buffers and decelerates, the opening is synchronously reduced to increase the return oil buffer pressure, thereby realizing reverse braking of the loading hydraulic cylinder (26).

7. The energy storage servo hydraulic high-speed proportional loading hydraulic system according to claim 1, characterized in that: A low liquid level sensor (12), a temperature sensor (13), an air filter (14) and a liquid level meter (15) are installed inside the oil tank.

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