Pressure testing system of hydraulic element

Abstract

The invention discloses a pressure test system for a hydraulic element, and the system at least comprises a multi-stage pressure test module and a control unit, the control unit is electrically connected with the multi-stage pressure test module, the multi-stage pressure test module comprises multi-stage pressure test loops which are connected in parallel, and the multi-stage pressure test loops are electrically connected with the control unit. Wherein the multi-stage pressure test loop comprises a manual pump test loop, a motor pump test loop and a pneumatic pump test loop, and the control unit is used for controlling the multi-stage pressure test module to be switched to a target pressure test loop according to a test requirement so as to provide a pressure signal of a corresponding magnitude; and synchronously receiving the pressure signal of the corresponding magnitude and dynamically adjusting the pressure so as to adapt to the pressure test of the hydraulic element. By means of the scheme, the pressure testing efficiency and precision can be remarkably improved.

Description

Technical Field

[0001] This application generally relates to the field of hydraulic component testing technology. More specifically, this application relates to a pressure testing system for hydraulic components. Background Technology

[0002] Hydraulic components are the core parts of industrial hydraulic systems, and their pressure performance directly affects the operational stability, reliability, and service life of the entire equipment. In many fields such as engineering machinery, aerospace, and intelligent manufacturing, hydraulic components need to maintain stable operation under different pressure conditions. Therefore, accurate and comprehensive pressure testing is a key link in product development and verification, production quality control, and after-sales maintenance, and is of great significance to ensuring the overall performance of the hydraulic system.

[0003] However, current mainstream hydraulic component testing equipment suffers from numerous technical limitations. For example, most mainstream hydraulic component testing equipment uses a single power source to provide pressure, making it difficult to simultaneously meet the testing requirements of low-pressure, medium-pressure, and ultra-high-pressure operating conditions. While some equipment can achieve high-pressure output, insufficient control precision in the low-pressure range limits the testing scenarios. Furthermore, data processing lacks automation, relying on manual recording and analysis, which is prone to errors and makes it difficult to quickly output comprehensive test results. These problems severely restrict the efficiency and accuracy of hydraulic component testing, failing to meet the demands for high efficiency and intelligent operation in industrial production.

[0004] In view of this, this application provides a pressure testing system for hydraulic components, which significantly improves the efficiency and accuracy of pressure testing through multi-stage pressure circuit parallel design and automatic data analysis, thereby meeting the industrial production demand for high-quality testing of hydraulic components. Summary of the Invention

[0005] In order to at least solve one or more of the technical problems mentioned above, this application proposes a pressure testing system for hydraulic components.

[0006] This application provides a pressure testing system for hydraulic components, comprising at least: a multi-stage pressure testing module and a control unit. The control unit is electrically connected to the multi-stage pressure testing module. The multi-stage pressure testing module includes multi-stage pressure testing circuits connected in parallel, wherein the multi-stage pressure testing circuits include a manual pump testing circuit, a motor pump testing circuit, and a pneumatic pump testing circuit. The control unit is used to: control the multi-stage pressure testing module to switch to the target pressure testing circuit according to testing requirements to provide a pressure signal of the corresponding magnitude; synchronously receive pressure signals of the corresponding magnitude and dynamically adjust the pressure to adapt to the pressure testing of hydraulic components.

[0007] In some embodiments, the pressure range of the pneumatic pump test circuit is the highest, the pressure range of the manual pump test circuit is the lowest, and the pressure range of the motor pump test circuit is between the pressure range of the pneumatic pump test circuit and the pressure range of the manual pump test circuit.

[0008] In some embodiments, each pressure test circuit is equipped with a corresponding hydraulic pump, proportional relief valve, pressure sensor, and directional valve. The hydraulic pump is used to provide target pressure oil; the proportional relief valve is used to adjust the pressure in the target pressure test circuit to provide a pressure signal of the corresponding magnitude and to provide overflow protection; the pressure sensor is used to collect the pressure signal of the corresponding magnitude and feed it back to the control unit; the directional valve is used to control the oil and the start and stop of the test to adapt to the target pressure test circuit.

[0009] In some embodiments, the manual pump test circuit includes a manual hydraulic pump, a first proportional relief valve, a first pressure sensor, and a manual pump solenoid directional valve. The manual hydraulic pump is used to provide low-pressure oil. The first proportional relief valve is used to regulate the pressure in the manual pump test circuit to provide a pressure signal of a first order of magnitude and to provide overflow protection. The first pressure sensor is used to acquire the pressure signal of the first order of magnitude and feed it back to the control unit. The manual pump solenoid directional valve is used to control the oil and start / stop the test in the manual pump test circuit to adapt to the manual pump test circuit.

[0010] In some embodiments, the motor pump test circuit includes a motor-hydraulic gear pump, a second proportional relief valve, a second pressure sensor, and an electric drive pump solenoid directional valve. The motor-hydraulic gear pump is used to provide medium- and high-pressure hydraulic fluid. The second proportional relief valve is used to regulate the pressure in the motor pump test circuit to provide a second-level pressure signal and to provide overflow protection. The second pressure sensor is used to acquire the second-level pressure signal and feed it back to the control unit. The electric drive pump solenoid directional valve is used to control the hydraulic fluid and test start / stop to adapt to the motor pump test circuit.

[0011] In some embodiments, the pneumatic pump test circuit includes a pneumatic-hydraulic pump, a third proportional relief valve, a third pressure sensor, and a pneumatic pump solenoid directional valve. The pneumatic-hydraulic pump is used to provide high-pressure oil. The third proportional relief valve is used to regulate the pressure in the pneumatic pump test circuit to provide a third-order pressure signal and to provide overflow protection. The third pressure sensor is used to acquire the third-order pressure signal and feed it back to the control unit. The pneumatic pump solenoid directional valve is used to control the oil and test start / stop to adapt to the pneumatic pump test circuit.

[0012] In some embodiments, the control unit includes a mode switching module and a closed-loop control module. The mode switching module is used to control the multi-stage pressure test module to switch to the target pressure test loop. The closed-loop control module is used to convert the deviation between the received pressure signal of the corresponding magnitude and the corresponding preset value into an adjustment command, and adjust the opening degree of the corresponding proportional relief valve in the target pressure test loop to dynamically adjust the pressure.

[0013] In some embodiments, the closed-loop control module is further configured to: dynamically adjust the pressure by adjusting the opening of a first proportional relief valve in conjunction with a highly sensitive adjustment parameter in a manual pump test circuit; dynamically adjust the pressure by adjusting the opening of a second proportional relief valve in conjunction with an adaptive adjustment parameter in a motor pump test circuit; and dynamically adjust the pressure by adjusting the opening of a third proportional relief valve in conjunction with an overload protection module in a pneumatic pump test circuit.

[0014] In some embodiments, the pressure testing system further includes an oil recovery module electrically connected to the control unit, and the control unit is further configured to: automatically control the oil recovery module to perform oil recovery based on the test results, thereby achieving coordination between oil recovery and testing operations.

[0015] In some embodiments, the oil recovery module includes an oil collection unit, a filtration unit, and an oil storage unit. The oil collection unit is used to collect residual oil after the hydraulic components are disassembled and during testing operations. The filtration unit includes a coarse filtration subunit and a fine filtration subunit connected in series for multi-stage purification of the collected oil. The oil storage unit is used to store the oil after multi-stage purification.

[0016] In some embodiments, the oil collection unit includes an oil collection tank connected via a pipeline to the drain port of the hydraulic component under test, and the bottom of the oil collection tank has an inclined structure to guide the oil flow to the filter unit.

[0017] In some embodiments, the oil recovery module further includes a level detection unit and a return oil drive unit. The level detection unit is used to collect oil level data in the oil storage unit in real time and feed it back to the control unit so that the control unit can generate a start / stop control command for oil recovery. The return oil drive unit is used to receive the start / stop control command so as to be controlled to drive the oil recovery module to start or stop.

[0018] In some embodiments, the control unit is further configured to: generate a start control command in response to the oil level data collected by the level detection unit reaching a preset start threshold, and control the return oil drive unit to drive the oil recovery module to start; and generate a stop control command in response to the oil level data collected by the level detection unit being lower than a preset stop threshold, and control the return oil drive unit to drive the oil recovery module to stop.

[0019] Through the hydraulic component pressure testing system provided above, this embodiment of the application achieves precise pressure supply under all working conditions by electrically connecting multi-stage pressure testing modules and control units, utilizing a parallel architecture of three circuits (manual pump, electric pump, and pneumatic pump) and the switching and adjustment functions of the control unit. This solves the problems of insufficient pressure range coverage and low control accuracy in existing equipment. It meets the full-scenario testing needs of hydraulic components, from low-pressure sealing to ultra-high-pressure extreme loads, without requiring multiple devices with different ranges, significantly improving testing efficiency and data reliability, and reducing the investment cost and operational complexity of testing equipment. Furthermore, through dynamic coordination and automated data analysis functions, the testing process is greatly simplified, improving pressure testing efficiency and result accuracy, meeting the high-efficiency and intelligent testing requirements of industrial production for hydraulic components. Attached Figure Description

[0020] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, and the same or corresponding reference numerals denote the same or corresponding parts, wherein: Figure 1 This is an exemplary structural block diagram illustrating a pressure testing system 100 for hydraulic components according to an embodiment of this application; Figure 2 This is another exemplary structural block diagram illustrating a pressure testing system for hydraulic components according to an embodiment of this application; Figure 3 This is yet another exemplary structural block diagram illustrating a pressure testing system for hydraulic components according to an embodiment of this application; Figure 4 This is yet another exemplary structural block diagram illustrating a pressure testing system for hydraulic components according to an embodiment of this application; Figure 5 This is yet another exemplary structural block diagram illustrating a pressure testing system for hydraulic components according to an embodiment of this application; Figure 6 This is an exemplary schematic diagram showing the overall structure of a pressure testing system for hydraulic components according to an embodiment of this application; Figure 7This is an exemplary schematic diagram illustrating a pressure testing system for hydraulic components according to an embodiment of this application. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] It should be understood that the terms "comprising" and "including" as used in the specification and claims of this application indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0023] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0024] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0025] As described in the background section above, in practical applications of industrial hydraulic systems, the performance testing scenarios for hydraulic components are complex and diverse, and different types and specifications of hydraulic components have significantly different requirements for test parameters. Existing pressure testing equipment has several technical shortcomings in addressing these diverse needs.

[0026] Existing technologies mostly use a single power source to provide pressure, which makes it difficult to meet the full-condition testing requirements of low pressure, medium pressure and ultra-high pressure at the same time. Although some equipment can achieve high pressure output, the control accuracy of the low pressure section is insufficient, which limits the testing scenarios.

[0027] Furthermore, although there are improvements to the use of open-loop proportional valves for pressure regulation, this method lacks a real-time feedback regulation mechanism, resulting in slow pressure response and poor resistance to load disturbances, failing to meet the testing requirements of precision hydraulic components. Existing systems employ relatively crude oil recovery methods, relying heavily on open oil collection tanks or manual operation, leading to low recovery efficiency, difficulty in ensuring oil cleanliness, and potential resource waste and environmental burden.

[0028] In addition, test data needs to be recorded, organized and analyzed manually, which is not only inefficient, but also prone to errors due to human factors, making it difficult to quickly output pressure test results and failing to meet the high-efficiency and intelligent quality control requirements of industrial production for hydraulic components.

[0029] Based on this, this application provides a pressure testing system for hydraulic components. Through the integrated design of a multi-stage pressure testing module, a control unit, and an oil recovery module, it achieves full-condition pressure testing and efficient oil circulation. The multi-stage pressure testing module adopts a three-loop parallel architecture of a manual pump, a motor pump, and a pneumatic pump, covering different pressure ranges. The control unit ensures accurate pressure supply through mode switching and closed-loop regulation. The oil recovery module collects, purifies, and automatically returns the oil, reducing waste and pollution.

[0030] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0031] Figure 1 This is an exemplary structural block diagram illustrating a pressure testing system 100 for hydraulic components according to an embodiment of this application. Figure 1 As shown, the pressure testing system 100 may include at least a multi-stage pressure testing module 101 and a control unit 102, with the control unit 102 electrically connected to the multi-stage pressure testing module 101. The multi-stage pressure testing module 101 includes a manual pump test circuit 101-1, a motor pump test circuit 101-2, and a pneumatic pump test circuit 101-3 connected in parallel. The control unit 102 controls the multi-stage pressure testing module 101 to switch to the target pressure testing circuit according to the testing requirements, providing a pressure signal of the corresponding magnitude; it synchronously receives pressure signals and dynamically adjusts them to adapt to the pressure testing of hydraulic components.

[0032] As can be understood, a multi-stage pressure testing module is a modular component integrating three independent pressure testing loops. It can be designed in a standardized manner and directly installed on a test bench, achieving wide-range pressure output through loop switching. In practical applications, the inlet ends of all three testing loops (manual pump test loop, electric pump test loop, and pneumatic pump test loop) can be connected to the system's main oil supply line, and the outlet ends can be connected to the pressure input end of the hydraulic component under test via switching valve groups. The control unit flexibly switches between loops according to testing requirements, avoiding overload operation of a single loop and reducing system energy consumption. Therefore, by leveraging the complementary characteristics of different loops, it can cover testing requirements of different pressure levels, overcoming the pressure range limitations of traditional single-power-source testing systems.

[0033] In some embodiments, the pressure range of the pneumatic pump test circuit is the highest, the pressure range of the manual pump test circuit is the lowest, and the pressure range of the motor pump test circuit is in between.

[0034] Based on the requirements of actual application scenarios, the pressure range of each circuit can be set. For example, the pressure range of the manual pump test circuit is 0-200 kPa, suitable for low-pressure sealing tests and other scenarios. This pressure range can accurately detect minute leaks in hydraulic components under low-pressure conditions. The pressure range of the electric pump test circuit is 0-10 MPa, suitable for medium- and high-pressure durability tests. It can simulate the pressure environment of hydraulic components under normal operating conditions and verify their long-term stability. The pressure range of the pneumatic pump test circuit is 0-60 MPa, used for ultra-high-pressure ultimate load tests, which can detect the load-bearing capacity and structural integrity of hydraulic components under extreme pressure conditions. Based on this setting, the test system can cover the full range of operating condition testing requirements from low pressure to ultra-high pressure, greatly improving the system's adaptability and versatility.

[0035] In the implementation scenario, the control unit is electrically connected to the multi-stage pressure testing module. This electrical connection, via shielded cables and signal cables, enables signal transmission and command interaction between the control unit and the various electrical components within the multi-stage pressure testing module, ensuring stable control signal transmission and reducing the impact of external electromagnetic interference on test accuracy. The control unit can incorporate a distributed control architecture consisting of a programmable logic controller (PLC) and a host computer, responsible for command issuance, data acquisition, logical operations, test loop switching, and dynamic adjustment, making it the core component for achieving intelligent testing.

[0036] In some implementation scenarios, the aforementioned testing requirements may include parameters such as the rated pressure of the hydraulic component, testing conditions (e.g., sealing tests, durability tests, extreme load tests), and pressure accuracy requirements. For example, for low-pressure sealing tests of hydraulic components, the testing requirement is a low-pressure signal of 0-200 kPa, and the control unit will switch to the manual pump test circuit. For medium- and high-pressure durability tests, the requirement is a medium- and high-pressure signal of 0-10 MPa, so the control unit switches to the electric pump test circuit. For ultra-high-pressure extreme load tests, the requirement is a high-pressure signal of 0-60 MPa, so the control unit switches to the pneumatic pump test circuit. The control unit can automatically identify the test circuit corresponding to the target pressure level through a built-in test requirement parsing algorithm, and issue switching control commands through the digital output module to achieve rapid and accurate circuit switching.

[0037] During the dynamic adjustment of the pressure signal, the control unit receives the actual pressure signal fed back by the pressure sensor in real time, compares it with the preset target pressure value, calculates the deviation value through the built-in adjustment algorithm (such as PID algorithm), and generates corresponding adjustment commands to dynamically adjust the pressure output of the test circuit, ensuring that the actual pressure signal is stable within the target pressure range, thereby meeting the accuracy requirements of different hydraulic components for pressure testing.

[0038] As described above, this embodiment of the application establishes a multi-stage pressure testing module comprising parallel-connected manual pump test circuits, electric pump test circuits, and pneumatic pump test circuits, and establishes an electrical connection between the control unit and this multi-stage pressure testing module. The control unit can precisely switch to the target pressure test circuit according to testing requirements, flexibly providing pressure signals of different magnitudes. Based on this, it effectively overcomes the problem of limited testing range of traditional single pressure supply circuits, adapting to the diverse pressure testing needs of different hydraulic components. Simultaneously, the control unit synchronously receives pressure signals of corresponding magnitudes and dynamically adjusts them, ensuring stable and accurate pressure output, avoiding inefficiencies and errors caused by manually switching equipment or adjusting pressure, significantly improving the adaptability, convenience, and accuracy of hydraulic component pressure testing, simplifying the testing process, and reducing testing costs.

[0039] In some embodiments, each pressure test circuit is equipped with a corresponding hydraulic pump, proportional relief valve, pressure sensor, and directional valve. The hydraulic pump provides the target pressure hydraulic fluid; the proportional relief valve regulates the pressure in the target pressure test circuit to provide a pressure signal of the corresponding magnitude and provides overflow protection. The pressure sensor acquires the pressure signal of the corresponding magnitude and feeds it back to the control unit; the directional valve controls the hydraulic fluid and the start / stop of the test to adapt to the target pressure test circuit.

[0040] Specifically, the hydraulic pump, as the power source of the circuit, provides the target pressure hydraulic fluid. Its type and performance parameters are selected according to the pressure requirements of the corresponding circuit to ensure a stable output of the corresponding pressure level. The proportional relief valve is the core component of pressure regulation. Its functions are twofold: firstly, to regulate the pressure in the target pressure test circuit by receiving current signals from the control unit and changing the valve core opening to adjust the circuit pressure and provide the corresponding pressure signal; secondly, to provide overflow protection. When the circuit pressure exceeds a preset safety threshold, the proportional relief valve automatically opens the overflow channel to drain excess oil back to the tank, preventing excessive circuit pressure from damaging the tested components or causing system malfunction.

[0041] Pressure sensors are used to acquire pressure signals of corresponding magnitudes in real time and convert them into standard electrical signals, which are then fed back to the control unit to provide real-time data support for pressure regulation. The accuracy of the pressure sensor directly affects the pressure control accuracy of the entire system; therefore, high-precision pressure sensors must be selected, with a measurement accuracy of at least, for example, 0.1% FS, to ensure the accuracy of pressure signal acquisition.

[0042] Directional control valves are used to control the on / off state and flow direction of hydraulic fluid, thereby enabling the start and stop control of tests. Different types of directional control valves are selected based on the operating characteristics of different circuits to adapt to the pressure levels and control requirements of each circuit, ensuring the reliability of circuit switching and test start / stop.

[0043] In some embodiments, a manual pump test circuit includes a manual hydraulic pump, a first proportional relief valve, a first pressure sensor, and a manual pump solenoid directional valve. In some embodiments, an electric pump test circuit includes an electric hydraulic gear pump, a second proportional relief valve, a second pressure sensor, and an electric pump solenoid directional valve. In some embodiments, a pneumatic pump test circuit includes a pneumatic hydraulic pump, a third proportional relief valve, a third pressure sensor, and a pneumatic pump solenoid directional valve. The following will be combined with... Figure 2 More details about each test loop are described in detail.

[0044] Figure 2 This is another exemplary structural block diagram illustrating a pressure testing system for hydraulic components according to an embodiment of this application. It should be understood that... Figure 2 The above Figure 1 A specific embodiment of the pressure testing system, the above regarding Figure 1 The description also applies to Figure 2 .

[0045] like Figure 2As shown, the pressure testing system 100 may include at least a multi-stage pressure testing module 101 and a control unit 102, with the control unit 102 electrically connected to the multi-stage pressure testing module 101. The multi-stage pressure testing module 101 includes a manual pump test circuit 101-1, a motor pump test circuit 101-2, and a pneumatic pump test circuit 101-3 connected in parallel.

[0046] Furthermore, the manual pump test circuit 101-1 includes a manual hydraulic pump 101-11, a first proportional relief valve 101-12, a first pressure sensor 101-13, and a manual pump solenoid directional valve 101-14. The manual hydraulic pump 101-11 provides low-pressure hydraulic fluid. The first proportional relief valve 101-12 regulates the pressure in the manual pump test circuit to provide a first-order pressure signal and provides overflow protection. The first pressure sensor 101-13 acquires the first-order pressure signal and feeds it back to the control unit. The manual pump solenoid directional valve 101-14 controls the hydraulic fluid and the start / stop of the test to adapt to the manual pump test circuit.

[0047] Specifically, the manual hydraulic pump serves as the power source for this circuit. Driven manually, it provides a stable supply of low-pressure hydraulic fluid. Its output flow and pressure can be initially controlled by manually adjusting the handle, adapting to precise pressure supply under low-pressure conditions. The first proportional relief valve is specifically used to regulate the pressure in the manual pump test circuit. By receiving the current signal from the control unit, it precisely adjusts the valve core opening, thereby stabilizing the circuit pressure within the first order of magnitude (e.g., 0-200 kPa). Simultaneously, when the circuit pressure exceeds the safety threshold, it provides relief protection, avoiding test errors caused by pressure fluctuations during low-pressure testing.

[0048] The first pressure sensor can be installed at the oil outlet of the manual pump test circuit near the component under test. It can acquire the first-order pressure signal output by the circuit in real time, with an acquisition frequency of not less than 100Hz, ensuring the real-time and continuous nature of the pressure signal. The acquired pressure signal is converted and fed back to the control unit, providing data support for dynamic pressure adjustment under low-pressure conditions. The manual pump solenoid directional valve is used to control the flow of oil in the circuit, realizing the start and stop control of the test. It can quickly respond to the start and stop requirements of the test, and has good sealing performance to prevent low-pressure oil leakage from affecting the test accuracy.

[0049] In this scenario, the manual hydraulic pump is started manually to initially adjust the output pressure. The control unit collects the actual pressure signal in real time through the first pressure sensor, compares it with the preset target low pressure value, calculates the deviation, and then sends an adjustment command to the first proportional relief valve. By changing the valve core opening, the circuit pressure is precisely adjusted until the actual pressure stabilizes within the target range. During the test, the manual pump's solenoid directional valve remains open, and the hydraulic fluid continuously acts on the tested component. The first pressure sensor continuously feeds back pressure signals, and the control unit dynamically adjusts the pressure in real time. After the test is completed, the system automatically closes the manual pump's solenoid directional valve, cutting off the hydraulic fluid supply and completing the test process. This circuit, through the combination of manual drive and electronic control adjustment, ensures both the stability of the low-pressure supply and achieves precise pressure control, meeting the needs of scenarios such as low-pressure sealing tests.

[0050] Furthermore, the motor-pump test circuit 101-2 may include a motor-hydraulic gear pump 101-21, a second proportional relief valve 101-22, a second pressure sensor 101-23, and an electric drive pump solenoid directional valve 101-24. The motor-hydraulic gear pump 101-21 is used to provide medium-to-high pressure hydraulic fluid. The second proportional relief valve 101-22 is used to regulate the pressure in the motor-pump test circuit to provide a second-level pressure signal and to provide overflow protection. The second pressure sensor 101-23 is used to acquire the second-level pressure signal and feed it back to the control unit. The electric drive pump solenoid directional valve 101-24 is used to control the hydraulic fluid and test start / stop to adapt to the motor-pump test circuit.

[0051] It is understandable that the electric hydraulic gear pump, driven by an electric motor, has the advantages of stable output flow and low pressure pulsation, providing a continuous and stable medium-to-high pressure hydraulic fluid to the circuit. Its output power and speed can be adjusted by the control unit to adapt to medium-pressure output requirements of 0-10MPa, making it suitable for medium-to-high pressure durability testing and other scenarios. The second proportional relief valve, as the core of pressure regulation in this circuit, has a higher adjustment accuracy than the first proportional relief valve. It can precisely adjust the valve core opening according to the current signal (such as 4-20mA) from the control unit, achieving continuous pressure adjustment within the medium pressure range. It also has an overflow protection function, automatically opening the overflow when the circuit pressure exceeds the safety threshold of 10MPa to ensure system safety.

[0052] The second pressure sensor can be a high-precision diffused silicon pressure sensor with a measurement range of 0-15MPa and a measurement accuracy of ±0.05%FS. This second pressure sensor can be installed between the oil outlet of the circuit and the tested component, enabling real-time and accurate acquisition of pressure signals in the second order of magnitude (0-10MPa). The acquired signal is amplified, filtered, and then fed back to the control unit to ensure the accuracy of the pressure data. The electromagnetic directional valve of the electric pump is controlled by the control unit via electrical signals, featuring fast response and high switching frequency. It is used to control the on / off state of the circuit oil and the start / stop of the test. Its valve core is made of wear-resistant and corrosion-resistant materials, capable of withstanding long-term scouring by medium- and high-pressure oil, ensuring the circuit's sealing performance and service life.

[0053] In this scenario, the control unit issues a start command based on the test requirements, driving the electric motor to operate the motor-hydraulic gear pump. The solenoid directional valve is energized and opens, allowing hydraulic fluid to enter the circuit. A second pressure sensor collects the actual pressure signal in real time and feeds it back to the control unit. The control unit compares this signal with a preset target medium-pressure value, calculates the deviation using a PID algorithm, generates a corresponding current signal, and sends it to the second proportional relief valve. This adjusts the valve opening to change the circuit pressure. During the durability test, the control unit continuously monitors the pressure signal and dynamically adjusts the opening of the second proportional relief valve based on pressure fluctuations to ensure the pressure remains stable within the target range. It also records pressure data and test time to provide a basis for subsequent durability analysis. After the test, the control unit issues a stop command, the electric motor stops operating, the solenoid directional valve of the electric pump is de-energized and closes, and the hydraulic fluid supply to the circuit is cut off. This circuit, through the combination of motor drive and high-precision electronic control, achieves stable output and precise control of medium- and high-pressure conditions, meeting the testing requirements of hydraulic components under medium- and high-pressure operating conditions.

[0054] Furthermore, the pneumatic pump test circuit 101-3 includes a pneumatic-hydraulic pump 101-31, a third proportional relief valve 101-32, a third pressure sensor 101-33, and a pneumatic pump solenoid directional valve 101-34. The pneumatic-hydraulic pump 101-31 provides high-pressure hydraulic fluid. The third proportional relief valve 101-32 regulates the pressure in the pneumatic pump test circuit to provide a third-order pressure signal and provides overflow protection. The third pressure sensor 101-33 acquires the third-order pressure signal and feeds it back to the control unit. The pneumatic pump solenoid directional valve 101-34 controls the hydraulic fluid and the start / stop of the test to adapt to the pneumatic pump test circuit.

[0055] The aforementioned pneumatic hydraulic pump uses compressed air as its power source and boasts advantages such as high output pressure, compact structure, and no electrical sparks. It can provide ultra-high pressure hydraulic fluid of 0-60MPa to the circuit, making it suitable for ultra-high pressure extreme load testing of hydraulic components and simulating the working state of components under extreme pressure conditions. The third proportional relief valve can be a high-pressure type proportional relief valve with a rated working pressure of not less than 80MPa, capable of withstanding the impact of ultra-high pressure hydraulic fluid. By receiving current signals from the control unit, it precisely adjusts the pressure of the ultra-high pressure circuit, ensuring that the pressure remains stable within the third order of magnitude range. Simultaneously, it has a high-pressure relief protection function; when the circuit pressure exceeds the safety threshold of 60MPa, it quickly opens the relief channel to release excess hydraulic fluid, preventing system damage due to overpressure.

[0056] The third pressure sensor can be a high-pressure type, with a measurement range of 0-80MPa and a measurement accuracy of ±0.1% FS. It adopts a high-temperature and high-pressure resistant packaging structure. The third pressure sensor can be installed at a critical location in the ultra-high-pressure circuit, enabling real-time acquisition of ultra-high-pressure signals. It effectively resists the impact and vibration of high-pressure oil, ensuring the stability and accuracy of pressure signal acquisition. The acquired signal is specially processed and fed back to the control unit, providing reliable data support for ultra-high-pressure regulation. The pneumatic pump electromagnetic reversing valve controls the on / off of compressed air, featuring good high-pressure sealing performance and reliable switching. Its control air pressure is connected to the power source of the pneumatic hydraulic pump. The control unit controls the on / off of the air source, achieving precise switching of the reversing valve and ensuring the safety and reliability of the ultra-high-pressure testing process.

[0057] In this scenario, the control unit, based on the ultra-high pressure test requirements, controls the power supply to the pneumatic-hydraulic pump, causing it to start and output ultra-high pressure oil. Simultaneously, the control unit controls the control air supply to the solenoid directional valve of the pneumatic pump, opening the valve and allowing oil to enter the ultra-high pressure circuit. A third pressure sensor collects the actual high-pressure signal in real time and feeds it back to the control unit. The control unit compares this signal with a preset target high-pressure value, calculates the deviation using a PID algorithm, generates a current signal, and sends it to the third proportional relief valve. This valve adjusts the valve opening to precisely control the circuit pressure. During the extreme load test, the control unit closely monitors the pressure signal and system status. If any pressure anomaly or system malfunction is detected, it immediately cuts off the air supply to the pneumatic pump via the pneumatically controlled solenoid directional valve, stopping pressure output. Simultaneously, the emergency relief function of the third proportional relief valve is activated to ensure the safety of the tested component and the test system.

[0058] After the test is completed, the control unit shuts off the air supply, the pneumatic hydraulic pump stops working, and the solenoid directional valve of the air-driven pump closes, completing the ultra-high pressure test process. This circuit, through the combination of pneumatic drive and precise high-pressure adjustment, achieves stable supply and safe control of ultra-high pressure, meeting the requirements for extreme load testing of hydraulic components.

[0059] As described above, the control unit switches the multi-stage pressure testing module to the target pressure testing loop for pressure testing. Simultaneously, the control unit receives real-time pressure signals corresponding to the two stages and dynamically adjusts the pressure output of the testing loop by calculating the deviation value using a built-in adjustment algorithm. This ensures the actual pressure signal remains stable within the target pressure range, thereby meeting the accuracy requirements of different hydraulic components for pressure testing. In some embodiments, the control unit includes a mode switching module and a closed-loop control module, which implement the aforementioned functions.

[0060] Figure 3 This is yet another exemplary structural block diagram illustrating a pressure testing system for a hydraulic component according to an embodiment of this application. It should be understood that... Figure 3 The above Figure 1 , Figure 2 A specific embodiment of the pressure testing system, the above regarding Figure 1 , Figure 2 The description also applies to Figure 3 .

[0061] like Figure 3 As shown, the pressure testing system 100 may include at least a multi-stage pressure testing module 101 and a control unit 102, with the control unit 102 electrically connected to the multi-stage pressure testing module 101. The multi-stage pressure testing module 101 includes a manual pump test circuit 101-1, a motor pump test circuit 101-2, and a pneumatic pump test circuit 101-3 connected in parallel.

[0062] Furthermore, the manual pump test circuit 101-1 includes a manual hydraulic pump 101-11, a first proportional relief valve 101-12, a first pressure sensor 101-13, and a manual pump solenoid directional valve 101-14. The electric pump test circuit 101-2 may include an electric hydraulic gear pump 101-21, a second proportional relief valve 101-22, a second pressure sensor 101-23, and an electric pump solenoid directional valve 101-24. The pneumatic pump test circuit 101-3 includes a pneumatic hydraulic pump 101-31, a third proportional relief valve 101-32, a third pressure sensor 101-33, and a pneumatic pump solenoid directional valve 101-34.

[0063] In some embodiments, the control unit 102 may include a mode switching module 102-1 and a closed-loop control module 102-2. The mode switching module 102-1 controls the multi-stage pressure test module to switch to the target pressure test loop. The closed-loop control module 102-2 converts the deviation between the received pressure signal of the corresponding magnitude and the corresponding preset value into an adjustment command, adjusting the opening degree of the corresponding proportional relief valve in the target pressure test loop to dynamically adjust the pressure.

[0064] Specifically, the mode switching module controls the switching of multi-stage pressure testing modules to the target pressure testing loop. Its built-in loop switching logic algorithm can analyze the target pressure level based on the testing requirements, determine the corresponding testing loop, and generate switching control commands. For example, when the testing requirement is a low-pressure sealing test, the mode switching module analyzes the target pressure level as 0-200 kPa, determines the target loop to be the manual pump testing loop, and controls the corresponding solenoid switching valve to activate the manual pump testing loop while simultaneously disconnecting other loops, ensuring the accuracy and reliability of loop switching. When the testing requirements change, the mode switching module can respond quickly, achieving seamless switching between different loops to meet the needs of continuous testing.

[0065] The closed-loop control module converts the deviation between the received pressure signal of the corresponding magnitude and the corresponding preset value into an adjustment command. This command adjusts the opening of the proportional relief valve in the target pressure test loop to dynamically regulate the pressure. The deviation value is the difference between the preset target pressure value and the actual collected pressure value. The closed-loop control module processes this deviation value using a built-in PID control algorithm to generate a corresponding current control signal. This current signal acts on the solenoid coil of the proportional relief valve, changing the electromagnetic force of the coil and thus adjusting the valve core opening, achieving dynamic adjustment of the loop pressure. Through optimized adjustment using the PID algorithm, the loop pressure can quickly converge to the target value, and the pressure fluctuation amplitude is controlled within ±0.5%FS, significantly improving the accuracy and stability of pressure control.

[0066] In some embodiments, the closed-loop control module can also be further used to: dynamically adjust the pressure by adjusting the opening of the first proportional relief valve in conjunction with a highly sensitive adjustment parameter in a manual pump test circuit; dynamically adjust the pressure by adjusting the opening of the second proportional relief valve in conjunction with an adaptive adjustment parameter in a motor pump test circuit; and dynamically adjust the pressure by adjusting the opening of the third proportional relief valve in conjunction with an overload protection module in a pneumatic pump test circuit.

[0067] In other words, a segmented optimization adjustment strategy is adopted to further improve the accuracy and adaptability of pressure regulation, taking into account the characteristics of different test loops. It can be understood that in the manual pump test loop, because this loop is used for low-pressure testing, the sensitivity requirement for pressure regulation is high. The closed-loop control module, in conjunction with highly sensitive adjustment parameters (such as a small proportional coefficient, a moderate integral coefficient, and a derivative coefficient), adjusts the opening of the first proportional relief valve to dynamically regulate the pressure. A small proportional coefficient can avoid pressure overshoot caused by excessive adjustment force, a moderate integral coefficient can quickly eliminate small static deviations under low-pressure conditions, and a derivative coefficient can suppress pressure fluctuations under low pressure, ensuring that the pressure regulation of the manual pump test loop is both sensitive and stable, meeting the high pressure accuracy requirements of low-pressure sealing tests.

[0068] In the motor pump test circuit, used for medium- and high-pressure testing, the test conditions are complex and may include load disturbances. The closed-loop control module, in conjunction with adaptive adjustment parameters, dynamically regulates the pressure by adjusting the opening of the second proportional relief valve. The adaptive adjustment parameters can adjust the proportional, integral, and derivative coefficients of the PID algorithm in real time based on actual pressure signal fluctuations and load changes. For example, when large pressure fluctuations or load disturbances are detected, the proportional and derivative coefficients are automatically increased to quickly suppress fluctuations and resist disturbances. When the pressure stabilizes, the proportional and integral coefficients are decreased to avoid pressure oscillations caused by over-adjustment, ensuring that the motor pump test circuit maintains high pressure control accuracy under different operating conditions.

[0069] In the pneumatic pump test circuit, used for ultra-high pressure testing, system safety is paramount. The closed-loop control module, in conjunction with the overload protection module, dynamically regulates the pressure by adjusting the opening of the third proportional relief valve. The overload protection module monitors the pressure change rate and absolute pressure value of the circuit in real time. When the pressure change rate exceeds a preset threshold (e.g., 5 MPa / s) or the pressure value approaches the safety upper limit of 60 MPa, the overload protection module sends a warning signal to the closed-loop control module. Upon receiving the signal, the closed-loop control module automatically adjusts the regulation parameters, reducing the proportional coefficient and decreasing the regulation force. Simultaneously, it controls the opening rate of the third proportional relief valve to prevent rapid pressure rise leading to overpressure. If the pressure continues to rise beyond the safety threshold, the overload protection module directly triggers the emergency relief function of the third proportional relief valve, forcibly releasing the pressure and ensuring the safety of the ultra-high pressure testing process.

[0070] In some embodiments, the control unit further includes a safety management module, which is used to monitor abnormal data during the testing process, and in response to the detection of abnormal data, controls the corresponding testing module to stop running and generates abnormal alarm information.

[0071] Abnormal data refers to test data that exceeds preset safety thresholds or reasonable ranges, such as over-range pressure, overload current, and sudden changes in flow. The safety control module is the functional module in the control unit responsible for monitoring abnormal data, initiating safety protection, and generating alarm information; it is the core of ensuring test safety. The safety control module has a higher response priority than other modules; once abnormal data is detected, it immediately interrupts other control logic and initiates the safety protection process.

[0072] In some embodiments, the pressure testing system for hydraulic components according to this application may further include an oil recovery module, which is electrically connected to a control unit. The control unit is further configured to: automatically control the oil recovery module to perform oil recovery based on test results, thereby achieving coordination between oil recovery and testing operations. For example Figure 4 As shown.

[0073] Figure 4This is yet another exemplary structural block diagram illustrating a pressure testing system for a hydraulic component according to an embodiment of this application. It should be understood that... Figure 4 The above Figure 1 Another specific embodiment of the pressure testing system, the above-mentioned Figures 1 to 3 The description also applies to Figure 4 .

[0074] like Figure 4 As shown, the pressure testing system 100 may include at least a multi-stage pressure testing module 101 and a control unit 102, with the control unit 102 electrically connected to the multi-stage pressure testing module 101. The multi-stage pressure testing module 101 includes a manual pump test circuit 101-1, a motor pump test circuit 101-2, and a pneumatic pump test circuit 101-3 connected in parallel.

[0075] Furthermore, the pressure testing system 100 may also include an oil recovery module 401. The oil recovery module 401 is electrically connected to the control unit 102. The test results may include information such as the test completion status and whether the test process was abnormal. When the control unit determines that the test has been completed normally or terminated abnormally, it will initiate the oil recovery process to ensure that residual oil during and after the test can be recovered in a timely manner, avoiding waste and environmental pollution caused by oil leakage.

[0076] The coordinated operation of oil recovery and testing includes real-time recovery during the testing process, where the oil recovery module collects any residual oil generated during testing to prevent oil accumulation; and centralized recovery after testing. After testing, the control unit opens the pressure relief valve of the test circuit to safely release any remaining high-pressure oil to the oil recovery module for centralized recovery. This coordinated design allows for seamless integration of oil recovery and the testing process, eliminating the need for manual intervention and significantly improving oil recovery efficiency.

[0077] Figure 5 This is yet another exemplary structural block diagram illustrating a pressure testing system for a hydraulic component according to an embodiment of this application. It should be understood that... Figure 5 The above Figure 1 Another specific embodiment of the pressure testing system, the above-mentioned Figures 1 to 4 The description also applies to Figure 5 .

[0078] like Figure 5 As shown, the pressure testing system 100 may include at least a multi-stage pressure testing module 101 and a control unit 102, with the control unit 102 electrically connected to the multi-stage pressure testing module 101. The multi-stage pressure testing module 101 includes a manual pump test circuit 101-1, a motor pump test circuit 101-2, and a pneumatic pump test circuit 101-3 connected in parallel.

[0079] Further, the manual pump test circuit 101-1 includes a manual hydraulic pump 101-11, a first proportional relief valve 101-12, a first pressure sensor 101-13, and a manual pump solenoid directional valve 101-14. The electric pump test circuit 101-2 may include an electric hydraulic gear pump 101-21, a second proportional relief valve 101-22, a second pressure sensor 101-23, and an electric pump solenoid directional valve 101-24. The pneumatic pump test circuit 101-3 includes a pneumatic hydraulic pump 101-31, a third proportional relief valve 101-32, a third pressure sensor 101-33, and a pneumatic pump solenoid directional valve 101-34. The control unit 102 may include a mode switching module 102-1 and a closed-loop control module 102-2.

[0080] In addition, the testing system 100 may also include an oil recovery module 401. The oil recovery module 401 is electrically connected to the control unit 102. In some embodiments, the oil recovery module 401 may further include an oil collection unit 401-1, a filtration unit 401-2, and an oil storage unit 401-3. The oil collection unit 401-1 is used to collect oil remaining after the hydraulic components are disassembled and during testing operations. The filtration unit 401-2 includes a coarse filtration subunit and a fine filtration subunit connected in series for multi-stage purification of the collected oil. The oil storage unit 401-2 is used to store the oil after multi-stage purification.

[0081] The oil collection unit is the first stage of oil recovery, responsible for collecting all residual oil. The filtration unit removes impurities from the collected oil and ensures purification through multi-stage filtration, including coarse and fine filtration. The oil storage unit is a container for storing the purified oil, ensuring that the oil's cleanliness is not secondary contaminated.

[0082] In some embodiments, the oil collection unit may further include an oil collection tank connected to the drain port of the hydraulic component under test via a pipeline. The bottom of the oil collection tank has an inclined structure to guide the oil flow towards the filter unit. In some implementations, the inclination angle of the inclined structure can be set to 5-10°, with the inclined direction facing the oil inlet of the filter unit, so that the oil in the oil collection tank automatically flows to the filter unit under gravity, preventing oil accumulation in the oil collection tank. Simultaneously, a guide channel can be provided at the bottom of the oil collection tank to further guide the oil flow, ensuring that the oil can quickly and thoroughly flow into the filter unit, improving oil recovery efficiency. Furthermore, a splash guard can be provided at the edge of the oil collection tank to prevent oil from splashing out of the oil collection tank during testing, causing oil waste and environmental pollution.

[0083] In some implementation scenarios, the coarse filtration subunit of the filtration unit can use, for example, a metal mesh filter, while the fine filtration subunit can use, for example, a glass fiber filter. Additionally, a pressure differential sensor can be installed between the two filters to monitor the filter element's clogging status. In this scenario, the oil in the collection tank is pumped to the coarse filtration subunit via, for example, a booster pump to remove large particulate impurities. The coarsely filtered oil then enters the fine filtration subunit to remove fine impurities (such as oil oxidation products and dust). The pressure differential sensor can monitor the pressure difference between the inlet and outlet of the two filters in real time. When the pressure difference exceeds a certain threshold, a filter clogging alarm is sent to the control unit, reminding the user to replace the filter element. The oil after two stages of filtration flows into the oil storage unit through pipelines. The oil in the oil storage unit can be pumped back to the main oil tank of the test system for oil reuse.

[0084] In some embodiments, the oil recovery module 401 may further include a level detection unit 401-4 and a return oil drive unit 401-5. The level detection unit 401-4 is used to collect oil level data in the oil storage unit in real time and feed it back to the control unit, so that the control unit can generate start / stop control commands for oil recovery. The return oil drive unit 401-5 is used to receive start / stop control commands and be controlled to drive the oil recovery module to start or stop.

[0085] In other words, the level detection unit is a component that monitors the oil level in the storage unit in real time and serves as the basis for the control unit to generate start / stop commands. The return oil drive unit is the core component that provides power for oil recovery and is responsible for transporting the oil from the collection unit to the filtration unit and the storage unit. In some implementation scenarios, the level detection unit can be connected to the PLC analog input module of the control unit via a signal cable to transmit level data in real time. The control terminal of the return oil drive unit can be connected to the PLC digital output module via a relay to receive start / stop control commands.

[0086] In some implementation scenarios, the liquid level detection unit can employ, for example, a float-type liquid level sensor, which can be installed inside the oil storage unit. When oil flows into the oil storage unit, the float rises with the liquid level, and the potentiometer inside the sensor rotates synchronously, converting the liquid level height into an electrical signal, which is transmitted to the control unit via a signal cable. The control unit converts the electrical signal into the actual liquid level value, compares it with a preset threshold, and generates start / stop control commands.

[0087] In some implementation scenarios, the return oil drive unit can employ, for example, a gear-type return oil pump. The inlet of this pump is connected to the bottom of the oil collection tank via a pipeline, and the outlet is connected to a filter unit. Upon receiving a start / stop control command from the control unit, the return oil pump starts or stops oil delivery. In other implementation scenarios, a drive motor can rotate the return oil pump, and the motor speed can be adjusted based on liquid level data. A liquid level detection unit provides real-time feedback of the liquid level data, and the control unit adjusts the motor speed accordingly to ensure stable oil delivery. For example, when the oil level in the storage unit is low, the motor runs at high speed to accelerate oil delivery; when the liquid level is high, the motor runs at low speed to prevent oil overflow.

[0088] In some embodiments, the control unit is further configured to: generate a start control command in response to the oil level data collected by the level detection unit reaching a preset start threshold, and control the return oil drive unit to start the oil recovery module; and generate a stop control command in response to the oil level data collected by the level detection unit falling below a preset stop threshold, and control the return oil drive unit to stop the oil recovery module.

[0089] Specifically, by setting a preset start threshold, when the oil level in the oil storage unit reaches this value, the control unit activates the return oil drive unit to ensure that oil accumulates to a certain amount before delivery, avoiding frequent start-stop cycles. A preset stop threshold is also set; when the oil level in the oil storage unit falls below this value, the control unit stops the return oil drive unit to prevent the return oil pump from running dry and being damaged. These thresholds can be set based on the oil storage unit volume, the operating characteristics of the return oil pump, and the oil delivery efficiency.

[0090] More specifically, after the aforementioned test is completed, oil continuously flows into the oil storage unit, and the liquid level detection unit collects liquid level data in real time. The control unit compares the real-time liquid level data with a preset start-up threshold. If the liquid level data collected consecutively is greater than or equal to the preset start-up threshold, it is determined that the start-up condition has been met. The control unit generates a start-up control command through the PLC's digital output module. After receiving the command, the return oil drive unit starts the motor, and the return oil pump begins to transport the oil in the oil storage unit to the main oil tank of the test system.

[0091] As the return oil pump continuously delivers oil, the oil level in the storage unit gradually decreases, and the level detection unit provides real-time data feedback. The control unit compares the real-time level data with a preset stop threshold. When the collected level data is ≤ the preset stop threshold multiple times consecutively, the stop condition is determined to be met. The control unit generates a stop control command. Upon receiving the command, the return oil drive unit smoothly stops the motor, and the return oil pump stops working, preventing the return oil pump from running dry. Based on this, through precise threshold determination and command generation, the automatic start and stop of oil recovery is achieved, avoiding the subjectivity and error of manual operation.

[0092] As described above, the embodiments of this application, through the coordinated design of a multi-stage pressure test loop (manual pump, electric pump, and pneumatic pump in parallel), combined with the precise switching and closed-loop regulation function of the control unit, achieve a wide range of pressure supply to meet the full-condition testing needs of hydraulic components, while ensuring the stability and accuracy of pressure control, effectively improving test reliability. Furthermore, this application also achieves efficient oil recycling through the multi-stage filtration and closed-loop return design of the automated oil recovery module, reducing waste and environmental pollution. The overall solution has a high degree of integration, simplifies the testing process, reduces manual intervention, lowers testing costs, and fully meets the needs of efficient, accurate, and environmentally friendly testing of hydraulic components.

[0093] Figure 6 This is an exemplary schematic diagram showing the overall structure of a pressure testing system for hydraulic components according to an embodiment of this application; Figure 7 This is an exemplary schematic diagram illustrating a pressure testing system for hydraulic components according to an embodiment of this application. Figure 6 , Figure 7 As shown, the pressure testing system 100 may include at least a multi-stage pressure testing module 101 and a control unit 102, with the control unit 102 electrically connected to the multi-stage pressure testing module 101. The multi-stage pressure testing module 101 includes a manual pump test circuit 101-1, a motor pump test circuit 101-2, and a pneumatic pump test circuit 101-3 connected in parallel.

[0094] Further, the manual pump test circuit 101-1 includes a manual hydraulic pump 101-11, a first proportional relief valve 101-12, a first pressure sensor 101-13, and a manual pump solenoid directional valve 101-14. The electric pump test circuit 101-2 may include an electric hydraulic gear pump 101-21, a second proportional relief valve 101-22, a second pressure sensor 101-23, and an electric pump solenoid directional valve 101-24. The pneumatic pump test circuit 103-3 includes a pneumatic hydraulic pump 103-31, a third proportional relief valve 103-32, a third pressure sensor 103-33, and a pneumatic pump solenoid directional valve. The aforementioned control unit 102 may include a mode switching module and a closed-loop control module, and the control unit 102 may include multiple units, such as a touch screen (A1), an electrical control cabinet (A2), and an industrial computer (A3).

[0095] In addition, the pressure testing system 100 may also include an oil recovery module, which may further include an oil collection unit 401-1, a filtration unit 401-2, an oil storage unit 401-3, a liquid level detection unit 401-4, and a return oil drive unit. The liquid level detection unit 401-4 may include a visual liquid level gauge (B1) and a liquid level sensor (B2).

[0096] In this scenario, the control unit's mode switching module first activates the parallel manual pump test circuit, electric motor pump test circuit, or pneumatic pump test circuit in the multi-stage pressure test module according to the test requirements. The corresponding manual hydraulic pump, electric motor hydraulic gear pump, or pneumatic hydraulic pump in the circuit begins supplying hydraulic fluid. The manual pump solenoid valve, electric drive pump solenoid valve, or pneumatic drive pump solenoid valve then activates accordingly, controlling the flow of hydraulic fluid and the start / stop of the test. The first, second, or third proportional relief valve in the circuit initially adjusts the circuit pressure, and the first, second, or third pressure sensor collects the circuit pressure signal in real time and feeds it back to the control unit.

[0097] Next, the closed-loop control module of the control unit receives the pressure signal, compares it with the preset pressure requirement, and dynamically adjusts the opening of the corresponding proportional relief valve to ensure stable pressure to meet the test requirements. During the test, the oil collection unit of the oil recovery module continuously collects the oil generated during the test operation and any residual oil. The collected oil is purified by the filtration unit and then transported to the oil storage unit for storage. The level detection unit collects the oil level data in the storage unit in real time and feeds it back to the control unit. The control unit controls the start and stop of the return oil drive unit based on the level data to achieve automated oil recovery. After the test is completed, the control unit controls the corresponding reversing valve to close to stop the oil supply, and the corresponding proportional relief valve assists in depressurization. The oil recovery module completes the collection, purification, and storage of the remaining oil, thus completing the test process.

[0098] As described above, the hydraulic component pressure testing system provided in this application effectively combines wide-range pressure supply, high-precision pressure regulation, and intelligent oil recovery, solving the technical defects of traditional pressure testing systems. It can meet the pressure testing needs of hydraulic components under different types and working conditions, providing reliable technical support for the research and development, production, and quality control of hydraulic components.

[0099] It should be understood that when the terms "first," "second," "third," and "fourth," etc., are used in the claims, specification, and drawings of this application, they are used only to distinguish different objects and not to describe a specific order. The terms "comprising" and "including" as used in the specification and claims of this application indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof.

[0100] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0101] Although the embodiments of this application are described above, the content is merely an example adopted for the purpose of facilitating understanding of this application and is not intended to limit the scope and application scenarios of this application. Any person skilled in the art described in this application may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this application, but the scope of patent protection of this application shall still be determined by the scope defined in the appended claims.

Claims

1. A pressure testing system for a hydraulic component, comprising at least: A multi-stage pressure testing module and a control unit are provided, wherein the control unit is electrically connected to the multi-stage pressure testing module. The multi-stage pressure testing module includes multiple pressure testing circuits connected in parallel, wherein the multi-stage pressure testing circuits include a manual pump testing circuit, a motor pump testing circuit, and a pneumatic pump testing circuit. The control unit is used for: According to the test requirements, the multi-level pressure test module is controlled to switch to the target pressure test loop to provide a pressure signal of the corresponding magnitude; It synchronously receives pressure signals of the corresponding magnitude and dynamically adjusts the pressure to adapt to the pressure testing of hydraulic components.

2. The pressure testing system according to claim 1, wherein the pressure range of the pneumatic pump test circuit is the highest, the pressure range of the manual pump test circuit is the lowest, and the pressure range of the electric pump test circuit is located between the pressure range of the pneumatic pump test circuit and the pressure range of the manual pump test circuit.

3. The pressure testing system according to claim 2, wherein each stage of the pressure testing circuit is equipped with a corresponding hydraulic pump, proportional relief valve, pressure sensor, and directional valve. The hydraulic pump is used to provide the target pressurized hydraulic fluid; The proportional relief valve is used to regulate the pressure in the target pressure test circuit to provide a pressure signal of the corresponding magnitude and to provide relief protection. The pressure sensor is used to collect pressure signals of the corresponding magnitude and feed them back to the control unit; The reversing valve is used to control the oil and start / stop the test to adapt to the target pressure test circuit.

4. The pressure testing system according to claim 3, wherein the manual pump test circuit includes a manual hydraulic pump, a first proportional relief valve, a first pressure sensor, and a manual pump solenoid directional valve. The manual hydraulic pump is used to provide low-pressure oil. The first proportional relief valve is used to regulate the pressure in the manual pump test circuit to provide a first-order pressure signal and to provide relief protection. The first pressure sensor is used to acquire a pressure signal of a first order of magnitude and feed it back to the control unit; The solenoid directional valve for the manual pump is used to control the oil level and start / stop of the test in the manual pump test circuit, in order to adapt to the manual pump test circuit.

5. The pressure testing system according to claim 3, wherein the motor pump test circuit includes a motor-hydraulic gear pump, a second proportional relief valve, a second pressure sensor, and an electric drive pump solenoid directional valve. The electric hydraulic gear pump is used to provide medium- and high-pressure hydraulic fluid; The second proportional relief valve is used to regulate the pressure in the motor pump test circuit to provide a second-order pressure signal and to provide relief protection. The second pressure sensor is used to acquire a pressure signal of the second order of magnitude and feed it back to the control unit; The electromagnetic reversing valve of the electric pump is used to control the oil and test start / stop, in order to adapt to the electric pump test circuit.

6. The pressure testing system according to claim 3, wherein the pneumatic pump test circuit includes a pneumatic hydraulic pump, a third proportional relief valve, a third pressure sensor, and a pneumatic pump solenoid directional valve. The pneumatic hydraulic pump is used to provide high-pressure oil. The third proportional overflow valve is used to regulate the pressure in the pneumatic pump test circuit to provide a third-order pressure signal and to provide overflow protection. The third pressure sensor is used to collect pressure signals of the third order of magnitude and feed them back to the control unit; The solenoid directional valve of the pneumatic pump is used to control the oil and start / stop the test, in order to adapt to the pneumatic pump test circuit.

7. The pressure testing system according to claim 3, wherein the control unit includes a mode switching module and a closed-loop control module. The mode switching module is used to control the multi-level pressure test module to switch to the target pressure test loop; The closed-loop control module converts the deviation between the received pressure signal of the corresponding magnitude and the corresponding preset value into an adjustment command, and adjusts the opening degree of the corresponding proportional relief valve in the target pressure test loop to dynamically adjust the pressure.

8. The pressure testing system according to claim 7, wherein the closed-loop control module is further configured to: In the manual pump test circuit, the pressure is dynamically adjusted by using a highly sensitive adjustment parameter to regulate the opening of the first proportional relief valve. In the test circuit of the motor pump, the pressure is dynamically adjusted by combining adaptive adjustment parameters to adjust the opening of the second proportional relief valve. In the pneumatic pump test circuit, the pressure is dynamically adjusted by regulating the opening of the third proportional relief valve in conjunction with the overload protection module.

9. The pressure testing system according to claim 1 further includes an oil recovery module, the oil recovery module being electrically connected to the control unit, the control unit being further configured to: The system automatically controls the oil recovery module to recover oil based on the test results, thereby achieving coordination between oil recovery and testing operations.

10. The pressure testing system according to claim 9, wherein the oil recovery module includes an oil collection unit, a filtration unit, and an oil storage unit. The oil collection unit is used to collect residual oil after the hydraulic components are disassembled and during testing operations; The filtration unit includes a coarse filtration subunit and a fine filtration subunit connected in series, which are used to perform multi-stage purification treatment on the collected oil. The oil storage unit is used to store oil that has undergone multi-stage purification treatment.

11. The pressure testing system according to claim 10, wherein the oil collection unit includes an oil collection tank, the oil collection tank being connected via a pipeline to the drain port of the hydraulic component under test, and the bottom of the oil collection tank having an inclined structure to guide the oil flow to the filter unit.

12. The pressure testing system according to claim 10, wherein the oil recovery module further includes a level detection unit and a return oil drive unit. The liquid level detection unit is used to collect the oil level data in the oil storage unit in real time and feed it back to the control unit so that the control unit can generate start and stop control commands for oil recovery. The oil return drive unit is used to receive the start / stop control command so as to be controlled to drive the oil recovery module to start or stop.

13. The pressure testing system of claim 12, wherein the control unit is further configured to: When the oil level data collected by the liquid level detection unit reaches the preset start threshold, a start control command is generated to control the oil return drive unit to drive the oil recovery module to start. When the oil level data collected by the liquid level detection unit is lower than the preset stop threshold, a stop control command is generated to control the oil return drive unit to drive the oil recovery module to stop.

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