Self-adaptive hydraulic power system with wide loading range
The adaptive wide loading range hydraulic power system solves the problem of insufficient control accuracy of the hydraulic simulation loading test bench under a wide loading range, realizes continuous loading and efficient control, and improves the system's working efficiency and reliability.
Patent Information
- Application Number
- CN202510948447.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-10
- Publication Date
- 2025-10-10
AI Technical Summary
The existing hydraulic simulation loading test bench has insufficient control accuracy at small loading forces under a wide loading range, resulting in failure to meet control requirements. In addition, replacing the power system is cumbersome and inefficient.
The system adopts an adaptive wide-loading range hydraulic power system, including a hydraulic oil tank, a pump-motor unit, a pressure sensing and closed-loop adjustment unit, a control unit and a testing mechanism, and an energy storage unit. It realizes multi-stage output setting through pressure sensing and closed-loop adjustment, and flexible adjustment by section. Combined with the energy storage unit, it buffers dynamic impacts and flow fluctuations to ensure control accuracy.
It achieves stable control accuracy within a wide loading range, supports continuous loading, eliminates the need to replace equipment midway, and improves work efficiency and system reliability.
Smart Images
Figure CN120759810A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of hydraulic simulation loading, and in particular to an adaptive wide loading range hydraulic power system. Background Art
[0002] Hydraulic simulation loading has the advantages of stable loading, fast dynamic response, easy adjustment, strong adaptability and good safety. It is widely used in testing, simulation experiments and other fields.
[0003] There are many types of test benches used for hydraulic simulated loading. The dynamic control accuracy of existing simulated loading tests can typically be controlled within a ±1%FS range. However, under certain conditions with a wide loading range, this ±1%FS control accuracy fails to meet the control accuracy requirements at low loading forces (for example, when the minimum loading force is 6 kN and the maximum loading force is 600 kN, the ±1%FS accuracy is ±6 kN. The control accuracy value is already equal to the minimum loading force, so there is no controllable accuracy at the minimum loading force). Even when the effective controllable maximum and minimum loading forces are multiples larger, the low-load force simulation may not work properly when the maximum loading force is met. The current industry standard practice is to replace different power systems or use pneumatic loading methods to achieve simulated loading over a wide pressure range at low loading forces. This results in a large number of loading devices, a complex and cumbersome replacement process, low efficiency, and inability to perform continuous loading.
[0004] Therefore, developing a hydraulic loading power system that meets a wide loading range, ensures loading accuracy requirements, and is capable of adaptive continuous loading has become an urgent problem to be solved by technicians in the field of hydraulic simulation loading technology. Summary of the Invention
[0005] The main purpose of the present invention is to provide an adaptive wide loading range hydraulic power system to at least solve the problem that the control accuracy of the hydraulic simulation loading test bench in the prior art cannot meet the requirements under some wide loading range conditions at small loading forces.
[0006] In order to achieve the above-mentioned objectives, the present invention provides an adaptive wide loading range hydraulic power system, including: a hydraulic oil tank, the hydraulic oil tank having an oil delivery port, a first oil return port and a second oil return port; a pump motor group, the oil suction port of the pump motor group is connected to the oil delivery port to suck oil from the hydraulic oil tank through the oil delivery port; a pressure sensing and closed-loop regulation unit, connected to the oil delivery port of the pump motor group, the pressure sensing and closed-loop regulation unit is used to adjust the pressure of the hydraulic oil output by the pump motor group; a control unit and a testing mechanism, connected to the pressure sensing and closed-loop regulation unit, the control unit and the testing mechanism are used to receive the hydraulic oil regulated by the pressure sensing and closed-loop regulation unit to perform a hydraulic simulation loading test; an energy storage unit, connected to the pressure sensing and closed-loop regulation unit, the control unit and the testing mechanism, the energy storage unit is used to buffer the dynamic impact of the control unit and the testing mechanism during the hydraulic simulation loading process and to compensate for the flow fluctuation during the hydraulic simulation loading process of the control unit and the testing mechanism.
[0007] Furthermore, the hydraulic oil tank is provided with at least an air filter, a liquid level gauge and a thermometer.
[0008] Furthermore, the hydraulic power system also includes: an electromagnetic overflow valve, which is connected to the oil delivery port and the first oil return port of the pump motor unit. The electromagnetic overflow valve is used to return excess hydraulic oil to the hydraulic oil tank through the first oil return port when the pressure of the oil delivery port of the pump motor unit is greater than a preset value.
[0009] Furthermore, the hydraulic power system also includes: a high-pressure filter, which is arranged between the oil delivery port of the pump motor unit and the pressure sensing and closed-loop regulation unit, and is used to filter the hydraulic oil output by the pump motor unit.
[0010] Furthermore, the pressure sensing and closed-loop regulation unit includes: a pressure sensor and a proportional valve, which are arranged between the outlet of the high-pressure filter and the control unit and the testing mechanism. The pressure sensor is used to sense the pressure of the hydraulic oil filtered by the high-pressure filter and delivered to the control unit and the testing mechanism, and the proportional valve is used to regulate the pressure of the hydraulic oil delivered to the control unit and the testing mechanism.
[0011] Furthermore, the energy storage unit includes: a hydraulic switching valve, which is arranged between the pressure sensing and closed-loop regulation unit and the control unit and the testing mechanism; a low-pressure area accumulator, a medium-pressure area accumulator and a high-pressure area accumulator, and the low-pressure area accumulator, the medium-pressure area accumulator and the high-pressure area accumulator are respectively connected to the hydraulic switching valve; wherein the hydraulic switching valve switches and selects one of the low-pressure area accumulator, the medium-pressure area accumulator and the high-pressure area accumulator to be connected to the control unit and the testing mechanism according to the pressure range of the hydraulic oil delivered to the control unit and the testing mechanism.
[0012] Furthermore, the energy storage unit also includes: a low-pressure area safety valve, which is connected to the low-pressure area accumulator and the second oil return port; a medium-pressure area safety valve, which is connected to the medium-pressure area accumulator and the second oil return port; and a high-pressure area safety valve, which is connected to the high-pressure area accumulator and the second oil return port.
[0013] Furthermore, the energy storage unit also includes: a low-pressure area unloading valve, which is connected to the low-pressure area accumulator and the second oil return port; a medium-pressure area unloading valve, which is connected to the medium-pressure area accumulator and the second oil return port; and a high-pressure area unloading valve, which is connected to the high-pressure area accumulator and the second oil return port.
[0014] Furthermore, the hydraulic power system also includes: a cooling device, which is connected to the pressure sensing and closed-loop regulation unit, the control unit and the testing mechanism, and is used to cool the return oil of the pressure sensing and closed-loop regulation unit, the control unit and the testing mechanism; a low-pressure filter, which is connected to the cooling device and the first return oil port, and is used to filter the return oil of the pressure sensing and closed-loop regulation unit, the control unit and the testing mechanism and return it to the hydraulic oil tank.
[0015] Furthermore, the hydraulic power system also includes: an electronic control unit, which is connected to the pump motor unit, the pressure sensing and closed-loop regulation unit, the control unit and the testing mechanism, and the energy storage unit.
[0016] 1. The adaptive wide loading range hydraulic power system of the technical solution of the present invention includes a hydraulic oil tank, a pump motor group, a pressure sensing and closed-loop regulation unit, a control unit and a testing mechanism, and an energy storage unit. The hydraulic oil tank has an oil delivery port, a first oil return port and a second oil return port; the oil suction port of the pump motor group is connected to the oil delivery port to suck oil from the hydraulic oil tank through the oil delivery port; the pressure sensing and closed-loop regulation unit is connected to the oil delivery port of the pump motor group, and the pressure sensing and closed-loop regulation unit is used to adjust the pressure of the hydraulic oil output by the pump motor group; the control unit and the testing mechanism are connected to the pressure sensing and closed-loop regulation unit, and the control unit and the testing mechanism are used to receive the hydraulic oil regulated by the pressure sensing and closed-loop regulation unit to perform a hydraulic simulation loading test; the energy storage unit is connected to the pressure sensing and closed-loop regulation unit, the control unit and the testing mechanism, and the energy storage unit is used to buffer the dynamic impact of the control unit and the testing mechanism during the hydraulic simulation loading process and compensate for the flow fluctuation during the hydraulic simulation loading process of the control unit and the testing mechanism. By incorporating a pressure sensing and closed-loop regulation unit, the power system achieves multi-stage output settings to accommodate a wide range of loading requirements, with flexible zoning and remote control capabilities. By configuring the same energy storage unit as the power system output segment, the hydraulic power system output pressure is maintained stable in each segment, compensating for flow fluctuations during loading and buffering dynamic impacts during loading, ensuring control accuracy across all pressure zones. This addresses the issue of existing hydraulic simulation loading test benches, which often fail to meet control accuracy requirements at low loading forces under certain conditions with a wide loading range. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:
[0018] Figure 1 This is a structural block diagram of an optional adaptive wide loading range hydraulic power system according to an embodiment of the present invention;
[0019] Figure 2 This is a connection principle diagram of an optional adaptive wide loading range hydraulic power system according to an embodiment of the present invention.
[0020] The above drawings include the following reference numerals:
[0021] 1. Hydraulic oil tank; 2. Air filter; 3. Liquid level gauge; 4. Thermometer; 5. Pump motor unit; 6.1. First check valve; 6.2. Second check valve; 7. High-pressure filter; 8. Solenoid overflow valve; 9. Cooling device; 10. Pressure sensing and closed-loop regulation unit; 11. Pressure sensor; 12. Proportional valve; 13. Hydraulic switching valve; 14.1. Low-pressure zone safety valve; 14.2. Medium-pressure zone safety valve; 14.3. High-pressure area safety valve; 15.1, low-pressure area unloading valve; 15.2, medium-pressure area unloading valve; 15.3, high-pressure area unloading valve; 16.1, low-pressure area accumulator; 16.2, medium-pressure area accumulator; 16.3, high-pressure area accumulator; 17, ball valve; 18, control unit and testing mechanism; 19, electronic control unit; 20, energy storage unit; 30, low-pressure filter; S, oil delivery port; T1, first oil return port; T2, second oil return port. DETAILED DESCRIPTION
[0022] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0023] In order to achieve the above purpose, Figure 1 and Figure 2As shown, the present invention provides an adaptive wide loading range hydraulic power system, including a hydraulic oil tank 1, a pump motor unit 5, a pressure sensing and closed-loop regulation unit 10, a control unit and a testing mechanism 18, and an energy storage unit 20. The hydraulic oil tank 1 has an oil delivery port S, a first oil return port T1, and a second oil return port T2; the oil suction port of the pump motor unit 5 is connected to the oil delivery port S to suck oil from the hydraulic oil tank 1 through the oil delivery port S; the pressure sensing and closed-loop regulation unit 10 is connected to the oil delivery port of the pump motor unit 5, and the pressure sensing and closed-loop regulation unit 10 is used to adjust the output of the pump motor unit 5. The pressure of the hydraulic oil; the control unit and test mechanism 18 is connected to the pressure sensing and closed-loop regulation unit 10, and the control unit and test mechanism 18 is used to receive the hydraulic oil regulated by the pressure sensing and closed-loop regulation unit 10 to perform a hydraulic simulation loading test; the energy storage unit 20 is connected to both the pressure sensing and closed-loop regulation unit 10 and the control unit and test mechanism 18, and the energy storage unit 20 is used to buffer the dynamic impact during the hydraulic simulation loading process of the control unit and test mechanism 18 and compensate for the flow fluctuation during the hydraulic simulation loading process of the control unit and test mechanism 18. The pressure sensing and closed-loop regulation unit 10, the control unit and test mechanism 18, and the energy storage unit 20 are connected in parallel; by setting the pressure sensing and closed-loop regulation unit, the power system can be set to multiple output stages to meet a wide range of loading requirements, with flexible segmentation and remote setting; by setting the same energy storage unit as the power system output stage, the output pressure of the hydraulic power system is guaranteed to be stable in each stage, and the flow fluctuation during the loading process is compensated, and the dynamic impact during the loading process is buffered, thereby ensuring the control accuracy of loading in all pressure zones. The invention solves the problem that the control accuracy of the hydraulic simulation loading test bench in the prior art cannot meet the requirements when the loading force is small under some working conditions with a wide loading range.
[0024] In specific implementations, the hydraulic oil tank 1 is equipped with at least an air filter 2, a liquid level gauge 3, and a thermometer 4. The air filter 2 is used to filter air entering and exiting the hydraulic oil tank 1 during the process of liquid level fluctuations during normal operation of the power system. The liquid level gauge 3 is used to detect the liquid level in the hydraulic oil tank 1 to prevent damage to the pump in the pump-motor unit 5 due to cavitation caused by the liquid level being too low. The thermometer 4 is used to detect the temperature in the hydraulic oil tank 1. Based on the detected temperature, the cooling device 9 is controlled to ensure that the power system is within the normal operating range.
[0025] The hydraulic power system further includes an electromagnetic relief valve 8, which is connected to the oil delivery port of the pump-motor unit 5 and the first oil return port T1. When the pressure at the oil delivery port of the pump-motor unit 5 exceeds a preset value, the electromagnetic relief valve 8 is configured to return excess hydraulic oil through the first oil return port T1 to the hydraulic oil tank 1. The electromagnetic relief valve 8, located at the hydraulic oil output port of the pump-motor unit 5, serves as a no-load start / stop mechanism for the pump-motor unit 5 and provides pressure safety protection during normal operation of the power system.
[0026] Furthermore, the hydraulic power system also includes a high-pressure filter 7, which is arranged between the oil delivery port of the pump-motor group 5 and the pressure sensing and closed-loop regulation unit 10. The high-pressure filter 7 is used to filter the hydraulic oil output by the pump-motor group 5; the filtered hydraulic oil passes through the first one-way valve 6.1 and enters the high-pressure filter 7, and the filtered hydraulic oil is output to the ball valve 17, and then transported to the P port of the control unit and the test mechanism 18 through the ball valve 17 for use by the control unit and the test mechanism 18.
[0027] Furthermore, the pressure sensing and closed-loop regulation unit 10 includes a pressure sensor 11 and a proportional valve 12. The pressure sensor 11 and the proportional valve 12 are disposed between the outlet of the high-pressure filter 7 and the control unit and test mechanism 18. The hydraulic oil used by the control unit and test mechanism 18 is connected to both the pressure sensor 11 and the proportional valve 12 for closed-loop pressure control of the power system. The pressure sensor 11 senses the pressure of the hydraulic oil filtered by the high-pressure filter 7 and delivered to the control unit and test mechanism 18. The proportional valve 12 is used to perform closed-loop regulation of the pressure of the hydraulic oil delivered to the control unit and test mechanism 18. The control unit and test mechanism 18 has an oil inlet P and a third oil return port T. The hydraulic oil enters the control unit and test mechanism 18 through the oil inlet P and flows out through the third oil return port T and returns to the hydraulic oil tank 1.
[0028] Furthermore, the energy storage unit 20 includes a hydraulic switching valve 13, a low-pressure zone accumulator 16.1, a medium-pressure zone accumulator 16.2, and a high-pressure zone accumulator 16.3. The hydraulic switching valve 13 is arranged between the pressure sensing and closed-loop regulation unit 10 and the control unit and test mechanism 18. The low-pressure zone accumulator 16.1, the medium-pressure zone accumulator 16.2, and the high-pressure zone accumulator 16.3 are respectively connected to the hydraulic switching valve 13. The hydraulic switching valve 13 switches and selects one of the low-pressure zone accumulator 16.1, the medium-pressure zone accumulator 16.2, and the high-pressure zone accumulator 16.3 to communicate with the control unit and test mechanism 18 according to the pressure range of the hydraulic oil supplied to the control unit and test mechanism 18.
[0029] Furthermore, the energy storage unit 20 also includes a low-pressure area safety valve 14.1, a medium-pressure area safety valve 14.2, a high-pressure area safety valve 14.3, a low-pressure area unloading valve 15.1, a medium-pressure area unloading valve 15.2 and a high-pressure area unloading valve 15.3. The low-pressure area safety valve 14.1 and the low-pressure area unloading valve 15.1 are connected in parallel to each other and are connected to the low-pressure area accumulator 16.1 and the second oil return port T2; the medium-pressure area safety valve 14.2 and the medium-pressure area unloading valve 15.2 are connected in parallel to each other and are connected to the medium-pressure area accumulator 16.2 and the second oil return port T2; the high-pressure area safety valve 14.3 and the high-pressure area unloading valve 15.3 are connected in parallel to each other and are connected to the high-pressure area accumulator 16.3 and the second oil return port T2. At the same time, the hydraulic oil used by the control unit and the test mechanism 18 is connected to the hydraulic switching valve 13, and the hydraulic switching valve 13 is selectively connected to the low-pressure area accumulator 16.1, the medium-pressure area accumulator 16.2 and the high-pressure area accumulator 16.3. The low-pressure area safety valve 14.1 is used for pressure safety limit protection of the low-pressure area accumulator 16.1, the medium-pressure area safety valve 14.2 is used for pressure safety limit protection of the medium-pressure area accumulator 16.2, and the high-pressure area safety valve 14.3 is used for High-pressure accumulator 16.3 is protected by a pressure safety limit. Low-pressure unloading valve 15.1 is used to unload the pressure of low-pressure accumulator 16.1. Medium-pressure unloading valve 15.2 is used to unload the pressure of medium-pressure accumulator 16.2. High-pressure unloading valve 15.3 is used to unload the pressure of high-pressure accumulator 16.3. After unloading by low-pressure unloading valve 15.1, medium-pressure unloading valve 15.2, and high-pressure unloading valve 15.3, the hydraulic oil returns to hydraulic oil tank 1 through the second oil return port T2.
[0030] This embodiment comprises a low-pressure accumulator 16.1, a medium-pressure accumulator 16.2, and a high-pressure accumulator 16.3. The specific allocation of the high, medium, and low pressure zones is to divide the power system's maximum system pressure into three equal parts, with the pressures arranged in descending order as the high-pressure zone, the medium-pressure zone, and the low-pressure zone. For example, if the power system's maximum pressure is 210 bar, the low-pressure zone is 0-70 bar, the medium-pressure zone is 71-140 bar, and the high-pressure zone is 141-210 bar. The nitrogen filling pressures of the low-pressure accumulator 16.1, the medium-pressure accumulator 16.2, and the high-pressure accumulator 16.3 are 70%-75% of the corresponding maximum pressure of each pressure zone.
[0031] When the pressure sensor 11 and the proportional valve 12 control the output pressure of the power system in the low-pressure range in the closed-loop control, the hydraulic switching valve 13 remains in the middle position, the medium-pressure area accumulator 16.2 and the high-pressure area accumulator 16.3 do not participate in the system operation, and only the low-pressure area accumulator 16.1 is connected to stabilize the output pressure of the hydraulic power system, compensate for flow fluctuations during loading, buffer dynamic impacts during loading, and ensure the control accuracy of low-pressure area loading; when the pressure sensor 11 and the proportional valve 12 control the output pressure of the power system in the medium-pressure range in the closed-loop control, the hydraulic switching valve 13 is switched to the left position under the action of the pressure oil, and the low-pressure area accumulator 16.1 and the high-pressure area accumulator 16.3 do not participate in the system operation. When the system is working, only the medium-pressure area accumulator 16.2 is connected to stabilize the output pressure of the hydraulic power system, compensate for flow fluctuations during loading, buffer dynamic impacts during loading, and ensure the control accuracy of loading in the medium-pressure area. When the closed-loop control of the pressure sensor 11 and the proportional valve 12 controls the output pressure of the power system to be within the high-pressure area, the hydraulic switching valve 13 is switched to the right position under the action of the pressurized oil. The low-pressure area accumulator 16.1 and the medium-pressure area accumulator 16.2 do not participate in the system operation. Only the high-pressure area accumulator 16.3 is connected to stabilize the output pressure of the hydraulic power system, compensate for flow fluctuations during loading, buffer dynamic impacts during loading, and ensure the control accuracy of loading in the high-pressure area.
[0032] The accumulator, safety valve and unloading valve of the energy storage unit 20 in the embodiment of the present invention are not limited to three, and multiple ones can be provided according to actual working conditions.
[0033] Furthermore, the hydraulic power system also includes a cooling device 9 and a low-pressure filter 30. The cooling device 9 is connected to the pressure sensing and closed-loop regulation unit 10, the control unit, and the test mechanism 18. The cooling device 9 is used to cool the return oil from the pressure sensing and closed-loop regulation unit 10, the control unit, and the test mechanism 18. During loading, heat is easily generated. The third return oil port T of the control unit and the test mechanism 18 is back-pressured by the second one-way valve 6.2 to return to the cooling device 9. Simultaneously, the return oil from the proportional valve 12 also returns to the cooling device 9. The low-pressure filter 30 is connected to the cooling device 9 and the first return oil port T1. The cooled oil passes through the low-pressure filter 30 and directly returns to the hydraulic oil tank 1 from the first return oil port T1. The high-pressure filter 7 and the low-pressure filter 30 are used to ensure the cleanliness of the hydraulic oil in the power system. Both the high-pressure filter 7 and the low-pressure filter 30 are equipped with a bypass one-way valve and an alarm device for when the filter element is saturated and clogged.
[0034] Furthermore, the hydraulic power system also includes an electronic control unit 19, which is connected to the pump motor group 5, the pressure sensing and closed-loop regulation unit 10, the control unit and testing mechanism 18, and the energy storage unit 20; the electronic control system 19 specifically implements all the functions and control logic described above.
[0035] During the specific working process of the adaptive wide loading range hydraulic power system of the present invention, first, the pump motor unit 5 sucks oil from the S port of the hydraulic oil tank 1 and outputs pressure oil, which enters the high-pressure filter 7 through the first one-way valve 6.1 for filtration, and the pressure sensor 11 senses the pressure of the hydraulic oil filtered by the high-pressure filter 7 and delivered to the control unit and the test mechanism 18; the pressure measuring point M1 is the pump outlet pressure detection point of the pump motor unit 5, and the pressure measuring point M2 is the pressure detection point of the hydraulic power system; thereby, the pressure detection of the front and rear ends of the high-pressure filter 7 is realized; the output end of the high-pressure filter 7 is directly connected to the oil inlet P and the hydraulic switching valve 13 of the control unit and the test mechanism 18 respectively, and the output end of the high-pressure filter 7 is also connected to the control unit and the test mechanism 18 through the proportional valve 12. The third oil return port T of the test mechanism 18 is connected, and the proportional valve 12 performs closed-loop regulation of the pressure of the hydraulic oil delivered to the control unit and the test mechanism 18 through the third oil return port T. The hydraulic switching valve 13 is connected to the low-pressure accumulator 16.1, the medium-pressure accumulator 16.2, and the high-pressure accumulator 16.3 in the hydraulic zone. The hydraulic switching valve 13 switches and selects one of the low-pressure accumulator 16.1, the medium-pressure accumulator 16.2, and the high-pressure accumulator 16.3 to connect to the control unit and the test mechanism 18 according to the pressure range of the hydraulic oil delivered to the control unit and the test mechanism 18. This stabilizes the output pressure of the hydraulic power system, compensates for flow fluctuations during loading, buffers dynamic impacts during loading, and ensures control accuracy of loading in all pressure zones.
[0036] The beneficial effects of the present invention are:
[0037] (1) A closed-loop control method using a pressure sensor 11 and a proportional valve 12 is used at the hydraulic oil output end of the power system to achieve multi-stage output settings of the power system to cope with a wide range of loading requirements. The zoning is flexible and can be set remotely.
[0038] (2) Setting the energy storage unit 20 to match the output section of the power system, ensuring the stability of the output pressure of the hydraulic power system in each section, compensating for flow fluctuations during loading, and buffering dynamic impacts during loading, thus ensuring the control accuracy of loading in all pressure zones;
[0039] (3) The energy storage unit 20 uses a hydraulic switching valve 13 to adaptively select the accumulator according to the output pressure of the power system, which can achieve continuous loading requirements without the need to replace the loading equipment midway and manually adjust the power system, reducing equipment investment and improving work efficiency;
[0040] (4) The oil return ports that are prone to heat, such as the outlet of the electromagnetic overflow valve 8, the outlet of the proportional valve 12, the return port of the control unit and the test mechanism 18, are all returned to the hydraulic oil tank 1 after passing through the cooling device 9 and the low-pressure filter 30, ensuring that the temperature rise of the power system does not exceed the limit and the cleanliness of the oil, improving the reliability of the system and extending the service life of the system.
[0041] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.
Claims
1. An adaptive wide loading range hydraulic power system, characterized in that: include: A hydraulic oil tank (1), the hydraulic oil tank (1) having an oil delivery port (S), a first oil return port (T1) and a second oil return port (T2); A pump-motor assembly (5), wherein the oil suction port of the pump-motor assembly (5) is connected to the oil delivery port (S) so as to suck oil from the hydraulic oil tank (1) through the oil delivery port (S); A pressure sensing and closed-loop regulating unit (10) is connected to the oil delivery port of the pump-motor unit (5), and the pressure sensing and closed-loop regulating unit (10) is used to regulate the pressure of the hydraulic oil output by the pump-motor unit (5); A control unit and a testing mechanism (18) are connected to the pressure sensing and closed-loop regulating unit (10), and the control unit and the testing mechanism (18) are used to receive the hydraulic oil regulated by the pressure sensing and closed-loop regulating unit (10) to perform a hydraulic simulation loading test; An energy storage unit (20) is connected to the pressure sensing and closed-loop regulation unit (10) and the control unit and the test mechanism (18). The energy storage unit (20) is used to buffer the dynamic impact of the control unit and the test mechanism (18) during the hydraulic simulation loading process and to compensate for flow fluctuations during the hydraulic simulation loading process of the control unit and the test mechanism (18).
2. The adaptive wide loading range hydraulic power system according to claim 1, characterized in that: The hydraulic oil tank (1) is provided with at least an air filter (2), a liquid level gauge (3) and a thermometer (4).
3. The adaptive wide loading range hydraulic power system according to claim 1, characterized in that: The hydraulic power system further comprises: An electromagnetic overflow valve (8), the electromagnetic overflow valve (8) is connected to the oil delivery port of the pump motor unit (5) and the first oil return port (T1), and the electromagnetic overflow valve (8) is used to return excess hydraulic oil to the hydraulic oil tank (1) through the first oil return port (T1) when the pressure of the oil delivery port of the pump motor unit (5) is greater than a preset value.
4. The adaptive wide loading range hydraulic power system according to claim 1, characterized in that: The hydraulic power system further comprises: A high-pressure filter (7) is provided between the oil delivery port of the pump-motor assembly (5) and the pressure sensing and closed-loop regulating unit (10), and the high-pressure filter (7) is used to filter the hydraulic oil output by the pump-motor assembly (5).
5. The adaptive wide loading range hydraulic power system according to claim 4, characterized in that: The pressure sensing and closed-loop regulation unit (10) comprises: A pressure sensor (11) and a proportional valve (12) are provided between the outlet of the high-pressure filter (7) and the control unit and the test mechanism (18). The pressure sensor (11) is used to sense the pressure of the hydraulic oil filtered by the high-pressure filter (7) and delivered to the control unit and the test mechanism (18). The proportional valve (12) is used to adjust the pressure of the hydraulic oil delivered to the control unit and the test mechanism (18).
6. The adaptive wide loading range hydraulic power system according to claim 1, characterized in that: The energy storage unit (20) comprises: A hydraulic switching valve (13) is provided between the pressure sensing and closed-loop regulating unit (10) and the control unit and testing mechanism (18); a low-pressure zone accumulator (16.1), a medium-pressure zone accumulator (16.2), and a high-pressure zone accumulator (16.3), wherein the low-pressure zone accumulator (16.1), the medium-pressure zone accumulator (16.2), and the high-pressure zone accumulator (16.3) are respectively connected to the hydraulic switching valve (13); The hydraulic switching valve (13) switches and selects one of the low-pressure area accumulator (16.1), the medium-pressure area accumulator (16.2) and the high-pressure area accumulator (16.3) to communicate with the control unit and the test mechanism (18) according to the pressure range of the hydraulic oil delivered to the control unit and the test mechanism (18).
7. The adaptive wide loading range hydraulic power system according to claim 6, characterized in that: The energy storage unit (20) further includes: a low-pressure area safety valve (14.1), the low-pressure area safety valve (14.1) being connected to the low-pressure area accumulator (16.1) and the second oil return port (T2); a medium-pressure area safety valve (14.2), the medium-pressure area safety valve (14.2) being connected to the medium-pressure area accumulator (16.2) and the second oil return port (T2); A high-pressure area safety valve (14.3) is connected to the high-pressure area accumulator (16.3) and the second oil return port (T2).
8. The adaptive wide loading range hydraulic power system according to claim 6, characterized in that: The energy storage unit (20) further includes: a low-pressure zone unloading valve (15.1), the low-pressure zone unloading valve (15.1) being connected to the low-pressure zone accumulator (16.1) and the second oil return port (T2); a medium-pressure zone unloading valve (15.2), the medium-pressure zone unloading valve (15.2) being connected to the medium-pressure zone accumulator (16.2) and the second oil return port (T2); A high-pressure area unloading valve (15.3) is connected to the high-pressure area accumulator (16.3) and the second oil return port (T2).
9. The adaptive wide loading range hydraulic power system according to claim 1, characterized in that: The hydraulic power system further comprises: a cooling device (9), the cooling device (9) being connected to the pressure sensing and closed-loop regulating unit (10) and the control unit and testing mechanism (18), the cooling device (9) being used to cool the return oil of the pressure sensing and closed-loop regulating unit (10) and the control unit and testing mechanism (18); A low-pressure filter (30) is connected to the cooling device (9) and the first oil return port (T1), and the low-pressure filter (30) is used to filter the return oil of the pressure sensing and closed-loop regulation unit (10), the control unit and the testing mechanism (18), and return the return oil to the hydraulic oil tank (1).
10. The adaptive wide loading range hydraulic power system according to claim 1, characterized in that: The hydraulic power system further comprises: The electronic control unit (19) is connected to the pump motor unit (5), the pressure sensing and closed-loop regulation unit (10), the control unit and testing mechanism (18), and the energy storage unit (20).