Solenoid valve test system and method

Abstract

The invention provides an electromagnetic valve testing system and method, and relates to the technical field of equipment testing. The system is characterized in that a liquid supply device is connected with a first delivery pump through a hydraulic channel, the first delivery pump is connected with each electromagnetic valve through the hydraulic channel, each electromagnetic valve is connected with a control cavity through the hydraulic channel, and the control cavity is connected with the liquid supply device through the hydraulic channel; the control cavity comprises a movable end, and a load simulation part is connected outside the cavity of the movable end; under the condition of load simulation, a hydraulic channel between the control cavity and the liquid supply device is closed, and the movable end moves under the action of hydraulic liquid output by the target electromagnetic valve and the load simulation piece; under the condition of non-load simulation, a hydraulic channel between the control cavity and the liquid supply device is opened, the movable end is fixed to a designated position, the target electromagnetic valve is used for outputting hydraulic liquid to the control cavity, and various hydraulic elements can be tested through the test loop. And the consumption of manpower, material resources, time and other resources is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment testing, and particularly to a solenoid valve testing system and method. Background Art

[0002] A solenoid valve is an electro-hydraulic conversion element that converts an input electrical signal into electromagnetic force to control the output of hydraulic fluid. Generally, it adjusts the direction, flow rate, speed, and other parameters of hydraulic fluid in an industrial control system, and can cooperate with different circuits to achieve the expected control. It is a basic automation element for controlling hydraulic fluid. The reliability level of the solenoid valve directly affects the reliability and safety of the entire hydraulic system.

[0003] According to whether the current is proportional to the output performance, solenoid valves can be divided into on-off valves and proportional valves. According to functional uses, solenoid valves can be divided into flow control valves and pressure control valves. Currently, manufacturers and users at home and abroad basically follow the past standards and methods when conducting reliability tests on solenoid valves and hydraulic cylinders. Each test circuit can only test one type of hydraulic component. When there are many types of samples to be tested, reliability tests need to be carried out multiple times and different reliability test benches need to be built, which requires a large amount of human, material, and time resources. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention provides a solenoid valve testing system and method.

[0005] The present invention provides a solenoid valve testing system, including: a liquid supply device, a first delivery pump, at least two solenoid valves, and a control chamber, and at least two of the solenoid valves are arranged in parallel; The liquid supply device is connected to the first delivery pump through a hydraulic channel, the first delivery pump is respectively connected to each solenoid valve through a hydraulic channel, each solenoid valve is respectively connected to the control chamber through a hydraulic channel, and the control chamber is connected to the liquid supply device through a hydraulic channel; the control chamber includes a movable end, and a load simulation member is connected outside the cavity of the movable end; In the case of load simulation, the hydraulic channel between the control chamber and the liquid supply device is closed, and the movable end moves under the action of the hydraulic fluid output by the target solenoid valve and the load simulation member to obtain the displacement response characteristic of the movable end corresponding to the load simulation member; in the case of non-load simulation, the hydraulic channel between the control chamber and the liquid supply device is opened, the movable end is fixed at a specified position, and the target solenoid valve is used to output hydraulic fluid to the control chamber to obtain a pre-collected response characteristic representing the performance test result of the target solenoid valve.

[0006] A solenoid valve testing system provided by the present invention further includes an auxiliary chamber. The accommodating chamber of the solenoid valve testing system is separated into the auxiliary chamber and the control chamber by the movable end; the auxiliary chamber is provided with a return port, and the auxiliary chamber is connected to a second delivery pump.

[0007] In a solenoid valve testing system provided by the present invention, the load simulation member is an elastic member, and the elastic member is connected between the movable end and the end of the auxiliary chamber away from the control chamber.

[0008] In a solenoid valve testing system provided by the present invention, the connection between the elastic member and the movable end is a detachable connection.

[0009] In a solenoid valve testing system provided by the present invention, a first on-off control member is provided on the hydraulic channel between the first delivery pump and each solenoid valve, and a flow meter is provided on the hydraulic channel between the control chamber and the liquid supply device; The first delivery pump is also connected to each solenoid valve respectively through an internal leakage bypass hydraulic channel, and a micro flow meter and a second on-off control member are provided on the internal leakage bypass hydraulic channel.

[0010] A solenoid valve testing system provided by the present invention further includes a test chamber, and at least two solenoid valves are arranged in the test chamber; a first temperature control system is provided in the test chamber; a second temperature control system is provided in the liquid supply device.

[0011] In a solenoid valve testing system provided by the present invention, a relief valve is provided on the hydraulic channel between the control chamber and the liquid supply device; the control type of the relief valve is an electromagnetic control type; The control chamber is also connected to the liquid supply device through an unloaded bypass hydraulic channel, and a third on-off control member is provided on the unloaded bypass hydraulic channel.

[0012] A solenoid valve testing system provided by the present invention further includes a host computer, a data acquisition card, a controller and a proportional amplifier. The host computer is respectively connected to the data acquisition card and the controller; the controller is connected to the proportional amplifier; The proportional amplifier is respectively connected to the first delivery pump, at least two solenoid valves, the second delivery pump, the first on-off control member, the second on-off control member, the third on-off control member, the relief valve, the first temperature control system and the second temperature control system; A first pressure sensor is provided at the outlet of the first delivery pump, a second pressure sensor is provided at the inlet of the test chamber, a third pressure sensor is provided at the outlet of the test chamber, a first temperature sensor is provided inside the test chamber, a second temperature sensor is provided inside the fuel tank, and a displacement sensor is provided at the movable end of the control chamber; the first pressure sensor, the second pressure sensor, the third pressure sensor, the first temperature sensor, the second temperature sensor, and the displacement sensor are respectively connected to the data acquisition card.

[0013] The present invention also provides a solenoid valve testing method, which is applied to any one of the above-mentioned solenoid valve testing systems, and includes: determining a target solenoid valve among at least two solenoid valves; Delivering the hydraulic fluid in the liquid supply device to the target solenoid valve through the first delivery pump; When the solenoid valve test of the target solenoid valve is load simulation, closing the hydraulic channel between the control chamber and the liquid supply device, and delivering the hydraulic fluid to the control chamber through the target solenoid valve to obtain the displacement response characteristic of the movable end corresponding to the load simulation part, and the displacement response characteristic is used to characterize the performance test result of the target solenoid valve; or When the solenoid valve test of the target solenoid valve is non-load simulation, opening the hydraulic channel between the control chamber and the liquid supply device, and delivering the hydraulic fluid to the control chamber through the target solenoid valve to obtain the pre-acquisition response characteristic, and the pre-acquisition response characteristic is used to characterize the performance test result of the target solenoid valve.

[0014] According to a solenoid valve testing method provided by the present invention, before delivering the hydraulic fluid to the control chamber through the target solenoid valve to obtain the pre-acquisition response characteristic, the method further includes: Opening the first on-off control member, closing the second on-off control member and the third on-off control member, and adjusting the set pressure of the relief valve to be higher than the rated pressure of the target solenoid valve; Delivering the hydraulic fluid to the auxiliary chamber through the second delivery pump, fixing the movable end at a specified position, and determining the volume of the control chamber to obtain the pre-acquisition response characteristic corresponding to the control chamber with a fixed volume; Delivering the hydraulic fluid to the control chamber through the target solenoid valve to obtain the pre-acquisition response characteristic includes: Repeating the step of delivering the hydraulic fluid to the auxiliary chamber through the second delivery pump, fixing the movable end at different positions to obtain the pre-acquisition response characteristics corresponding to the control chambers with different volumes, and the pre-acquisition response characteristics include pressure-flow characteristics and step response characteristics.

[0015] The solenoid valve testing system and method provided by the present invention are such that a liquid supply device is connected to a first delivery pump through a hydraulic channel, the first delivery pump is respectively connected to each solenoid valve through a hydraulic channel, each solenoid valve is respectively connected to a control chamber through a hydraulic channel, and the control chamber is connected to the liquid supply device through a hydraulic channel; the control chamber includes a movable end, and a load simulation member is connected outside the chamber of the movable end; by closing the hydraulic channel between the control chamber and the liquid supply device, the solenoid valve outputs hydraulic fluid to act on the movable end and the load simulation member, and controlling the movement of the movable end can at least test a pilot-controlled solenoid valve. By opening the hydraulic channel between the control chamber and the liquid supply device, the movable end is fixed at a specified position, and at least the flow-type solenoid valve can be measured, thereby realizing the testing of multiple types of hydraulic components in one test circuit and reducing the consumption of resources such as manpower, material resources, and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 FIG. 1 is one of the schematic structural diagrams of the solenoid valve testing system provided by the present invention.

[0018] Figure 2 FIG. 2 is the schematic structural diagram of the accommodation chamber of the solenoid valve testing system provided by the present invention.

[0019] Figure 3 FIG. 3 is another schematic structural diagram of the solenoid valve testing system provided by the present invention.

[0020] Figure 4 FIG. 4 is one of the schematic flowcharts of the solenoid valve testing method provided by the present invention.

[0021] Figure 5 FIG. 5 is another schematic flowchart of the solenoid valve testing method provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0023] The following will describe the solenoid valve testing system and method of the present invention in conjunction with Figures 1-5 FIGs. 1 to 5.

[0024] Figure 1 One of the schematic structural diagrams of the solenoid valve test system provided by the present invention, as Figure 1 shown, the system includes: a liquid supply device, a first delivery pump, at least two solenoid valves, and a control chamber, and at least two of the solenoid valves are arranged in parallel; The liquid supply device is connected to the first delivery pump through a hydraulic channel, the first delivery pump is respectively connected to each solenoid valve through a hydraulic channel, each solenoid valve is respectively connected to the control chamber through a hydraulic channel, and the control chamber is connected to the liquid supply device through a hydraulic channel; the control chamber includes a movable end, and a load simulation member is connected outside the cavity of the movable end; In the case of load simulation, the hydraulic channel between the control chamber and the liquid supply device is closed, and the movable end moves under the action of the hydraulic fluid output by the target solenoid valve and the load simulation member to obtain the displacement response characteristic of the movable end corresponding to the load simulation member; in the case of non-load simulation, the hydraulic channel between the control chamber and the liquid supply device is opened, the movable end is fixed at a specified position, and the target solenoid valve is used to output hydraulic fluid to the control chamber to obtain a pre-acquired response characteristic characterizing the performance test result of the target solenoid valve.

[0025] Among them, the liquid supply device refers to a device or container that provides hydraulic fluid. The liquid supply device can be an oil tank or an oil sump, etc. The hydraulic fluid is the medium for transmitting power and control in the system. The hydraulic fluid can be hydraulic oil or water-based hydraulic fluid, etc.

[0026] The delivery pump refers to a pump used to deliver hydraulic fluid from the liquid supply device to other components in the system. The delivery pump can be an electromagnetic-driven pump or an electromagnetic-driven mechanical-driven pump, etc. The hydraulic channel refers to a channel for transmitting hydraulic fluid. The hydraulic channel can also be called an oil circuit and a hydraulic pipeline, etc. Connecting the various components in the system through the hydraulic channel can facilitate the flow of hydraulic fluid.

[0027] The solenoid valve refers to an electro-hydraulic conversion element that converts the input electrical signal into electromagnetic force to control the fluid output. According to whether the current is proportional to the output performance, the solenoid valve can be divided into a switch valve and a proportional valve. According to the functional use, the solenoid valve can be divided into a flow control valve and a pressure control valve. Exemplarily, the solenoid valve can include an electromagnet and a hydraulic valve, and the opening and closing of the electromagnet can be controlled by the input electrical signal, so as to control the opening and closing of the hydraulic valve, and further control the fluid output and truncation. At least two solenoid valves can be solenoid valve 1, solenoid valve 2,..., solenoid valve N.

[0028] The control chamber is a hydraulic chamber with an adjustable volume. The performance of the solenoid valve, such as the response time and flow characteristics, is affected by the volume of the control chamber. By changing the volume of the control chamber, different working conditions and pressure environments can be simulated. The movable end refers to the part that can move in the control chamber. Exemplarily, the movable end can be a piston or a diaphragm, etc.; the movable end can be connected to a traction screw mechanism, and the movement of the movable end is controlled by the traction screw mechanism, or a fastener is provided on the part of the movable end outside the control chamber, and the fastener passes through the guide groove, and the movement of the movable end is controlled by the tightness fit between the fastener and the guide groove.

[0029] The designated position refers to the specific position where the movable end is fixed or held in the non-load simulation case to obtain the designated volume of the control chamber.

[0030] The load simulation component refers to a device or component used to simulate the actual working load. Exemplarily, the load simulation component can cooperate with the movable section to simulate the main valve spool corresponding to the pressure reducing valve used for pilot control.

[0031] The pre-acquisition response characteristics refer to the key performance indicators that need to be collected and determined in advance when testing the solenoid valve. The pre-acquisition response characteristics can include pressure-flow characteristics, step response characteristics, and proportional characteristics, etc., which are used to reflect the static performance and dynamic performance of the target solenoid valve, etc. The movable end moves under the action of the hydraulic fluid output by the target solenoid valve and the load simulation component, which is convenient for obtaining the displacement response characteristics of the movable end corresponding to the load simulation component.

[0032] Exemplarily, in the case of testing one solenoid valve each time for the solenoid valve test, the target solenoid valve refers to the solenoid valve being tested in this test among at least two solenoid valves.

[0033] Exemplarily, the fuel tank, the first delivery pump, each solenoid valve arranged in parallel and the control chamber can be closed-loop connected in sequence through the main oil circuit. A relief valve can be arranged near the outlet of the first delivery pump. The relief valve can be connected to the fuel tank through the return oil circuit to set the maximum working pressure of the system. When the pressure exceeds the maximum working pressure, the relief valve is opened to guide the excess hydraulic oil back to the fuel tank to prevent the system pressure from being too high. A throttle valve can also be arranged at the outlet of the first delivery pump to finely adjust the flow rate of the hydraulic oil in the main oil circuit and stabilize the flow rate of the hydraulic oil passing through the solenoid valve.

[0034] The solenoid valve test system provided by the embodiments of the present invention has a liquid supply device connected to a first delivery pump through a hydraulic channel. The first delivery pump is respectively connected to each solenoid valve through a hydraulic channel. Each solenoid valve is respectively connected to a control chamber through a hydraulic channel. The control chamber is connected to the liquid supply device through a hydraulic channel. The control chamber includes a movable end, and a load simulation member is connected outside the chamber of the movable end. By closing the hydraulic channel between the control chamber and the liquid supply device, the hydraulic liquid output by the solenoid valve acts on the movable end and the load simulation member to control the movement of the movable end, and at least the pilot control type solenoid valve can be tested. By opening the hydraulic channel between the control chamber and the liquid supply device, the movable end is fixed at a specified position, and at least the flow type solenoid valve can be measured, so as to realize the testing of multiple types of hydraulic components in one test loop, and reduce the consumption of resources such as manpower, material resources and time.

[0035] As Figure 2 shown, based on the above embodiment, the solenoid valve test system further includes an auxiliary chamber, and the accommodating chamber of the solenoid valve test system is divided into the auxiliary chamber and the control chamber by the movable end. The auxiliary chamber is provided with a return port, and the auxiliary chamber is connected to a second delivery pump.

[0036] Among them, the second delivery pump can be connected to the liquid supply device or to an independent auxiliary liquid supply device.

[0037] Exemplarily, the volume of the accommodating chamber of the solenoid valve test system is fixed. When the accommodating chamber is divided into an auxiliary chamber and a control chamber by the movable end, the return port can be closed to control the second delivery pump to inject fluid into the auxiliary chamber, control the movement of the movable end, reduce the volume of the control chamber, and increase the volume of the auxiliary chamber; or the return port can be opened so that the fluid in the auxiliary chamber can flow back to the auxiliary liquid supply device or the liquid supply device, and move towards the initial position under the action of the load simulation member, increase the volume of the control chamber, and reduce the volume of the auxiliary chamber.

[0038] In this embodiment, the accommodating chamber is divided into a control chamber and an auxiliary chamber by the movable end, and the volume of the control chamber is changed by the cooperation of injecting fluid into the auxiliary chamber by the second delivery pump and the load simulation member, which can facilitate the power supply of the entire solenoid valve test system using a single liquid supply device.

[0039] Pilot control is a control method that uses a small flow control signal to drive or regulate a large flow main system actuator. The pressure reducing type solenoid valve is commonly used as a pilot control in a hydraulic system. To facilitate the simulation of the damping of the actuator, based on any of the above embodiments, the load simulation member is an elastic member, and the elastic member is connected between the movable end and the end of the auxiliary chamber away from the control chamber. Among them, the elastic member can be a metal spring or an air spring, etc.

[0040] In order to facilitate the simulation of actuators with different damping, based on any of the above embodiments, the connection between the elastic member and the movable end is a detachable connection.

[0041] Exemplarily, there may be a single elastic member in the auxiliary cavity, and the elastic member is detachably connected between the movable end and the end of the auxiliary cavity opposite to the movable end, and the elastic member in the auxiliary cavity is replaced to simulate actuators with different damping. It is also possible that there are multiple elastic members in the auxiliary cavity, one end of each elastic member is fixedly connected to the end of the auxiliary cavity opposite to the movable end, and different damping actuators are simulated by detachably connecting the other ends of different elastic members to the movable end each time.

[0042] Based on any of the above embodiments, a first on-off control member is provided on the hydraulic channel between the first delivery pump and each solenoid valve, and a flowmeter is provided on the hydraulic channel between the control cavity and the liquid supply device; the first delivery pump is also connected to each solenoid valve through an internal leakage bypass hydraulic channel, and a micro flowmeter and a second on-off control member are provided on the internal leakage bypass hydraulic channel.

[0043] Among them, the micro flowmeter is used to detect the internal leakage of the solenoid valve, and the flowmeter is used to detect the flow rate through the solenoid valve when the first delivery pump supplies liquid to the solenoid valve through the hydraulic channel between the first delivery pump and each solenoid valve. The on-off control member refers to a device that controls the on-off of the fluid in the hydraulic channel, and can adjust or block the fluid flow by opening or closing the hydraulic channel to ensure the operation of the system as required. The on-off control member can be a stop valve or a switch-type solenoid valve, etc.

[0044] Exemplarily, multiple liquid outlets can be provided on the hydraulic channel between the first delivery pump and each solenoid valve, and each liquid outlet corresponds to a solenoid valve. The on-off of the hydraulic channel between the first delivery pump and each solenoid valve can be switched by the first on-off control member, and the on-off of the internal leakage bypass hydraulic channel can be switched by the second on-off control member.

[0045] In this embodiment, by opening the first on-off control member and closing the second on-off control member, the flow rate through the solenoid valve under the no-load condition of the system can be measured by the flowmeter, so as to obtain the pressure-flow characteristics of the hydraulic valve. By closing the first on-off control member and opening the second on-off control member, the internal leakage of the solenoid valve can be detected. In this way, by arranging the micro flowmeter on the internal leakage bypass hydraulic channel, while the internal leakage of the solenoid valve can be detected, the structural limitation of the micro flowmeter is avoided from increasing the pressure loss between the first delivery pump and each solenoid valve, and the micro flowmeter is damaged.

[0046] And in this embodiment, by arranging the micro flowmeter on the high-pressure port side, the influence of the back pressure on the measurement result of the internal leakage of the solenoid valve can be avoided, and the reliability of the internal leakage detection of the solenoid valve is increased.

[0047] Under actual harsh working conditions such as high and low temperatures, parameters such as the viscosity of the hydraulic fluid and the resistance of the solenoid coil will be affected. However, the laboratory test environment is relatively ideal, resulting in insufficient stability and durability test levels for solenoid valve testing, and it is easy to have problems of failure under extreme working conditions.

[0048] In order to conduct stability and durability tests of the product under harsh working conditions, based on any of the above embodiments, it further includes a test chamber, and at least two of the solenoid valves are arranged in the test chamber; a first temperature control system is provided in the test chamber; a second temperature control system is provided in the liquid supply device.

[0049] Among them, the test chamber is a closed container, and at least two solenoid valves can be arranged in parallel in the test chamber through a multi-way valve block.

[0050] In this embodiment, the high and low temperature environment where the solenoid valve is located can be simulated through the first temperature control system, and the temperature of the hydraulic fluid can be adjusted through the second temperature control system, so as to simulate the corresponding temperature of the hydraulic fluid flowing through the solenoid valve under high and low temperature environments, and fully conduct the stability and durability tests of the solenoid valve.

[0051] In order to facilitate load response testing of flow-type solenoid valves, etc., based on any of the above embodiments, a relief valve is provided on the hydraulic channel between the control chamber and the liquid supply device; the control type of the relief valve is electromagnetic control type; the control chamber is also connected to the liquid supply device through an unloaded bypass hydraulic channel, and a third on-off control component is provided on the unloaded bypass hydraulic channel.

[0052] Among them, the set pressure of the relief valve can be adjusted according to demand through an electrical signal. Exemplarily, by opening the first on-off control component and the third on-off control component, closing the second on-off control component, and adjusting the set pressure of the relief valve to be higher than the rated pressure of the solenoid valve, the system is in an unloaded working condition. By opening the first on-off control component, closing the second on-off control component and the third on-off control component, the set pressure of the relief valve can be adjusted to simulate the heavy object load connected to the solenoid valve under actual working conditions. The simulated heavy object load can be a wheel connected to a motor, or a fixture connected to an oil cylinder, etc.

[0053] It can be understood that the aforementioned flowmeter is located between the liquid supply device and the relief valve and the third on-off control component, so as to facilitate obtaining the flow rate of the hydraulic channel where the relief valve is located or the flow rate of the unloaded bypass hydraulic channel where the third on-off control component is located. Here, the unloaded state is relative to adjusting the set pressure of the relief valve to simulate the heavy object load.

[0054] In this embodiment, the no-load condition or the heavy-load industrial control condition can be simulated through the overflow valve and the third on-off control component. When it is convenient to cooperate with components such as the speed control valve to adjust the flow rate of the solenoid valve, the pressure difference between the inlet and outlet of the solenoid valve at different flow rates is recorded, and the pressure-flow characteristic curve is plotted to perform the load response test on the flow-type solenoid valve and the like.

[0055] To avoid the interference of the pipeline volume on the test results, the control chamber should be as close as possible to the oil outlet of the solenoid valve, and the third on-off control component should be as close as possible to the control chamber. Herein, as close as possible means that on the premise of meeting the system installation, maintenance, and function requirements, the pipeline length and volume between the control chamber and the third on-off control component and the oil outlet of the solenoid valve are minimized. In this embodiment, no further limitation is made on the range of the closest distance.

[0056] As Figure 3 shown, based on any of the above embodiments, the solenoid valve test system further includes a host computer, a data acquisition card, a controller, and a proportional amplifier. The host computer is respectively connected to the data acquisition card and the controller; the controller is connected to the proportional amplifier; The proportional amplifier is respectively connected to the first delivery pump, at least two solenoid valves, the second delivery pump, the first on-off control component, the second on-off control component, the third on-off control component, the overflow valve, the first temperature control system, and the second temperature control system; A first pressure sensor is provided at the outlet of the first delivery pump, a second pressure sensor is provided at the inlet of the test chamber, a third pressure sensor is provided at the outlet of the test chamber, a first temperature sensor is provided in the test chamber, a second temperature sensor is provided in the oil tank, and a displacement sensor is provided on the movable end of the control chamber; the first pressure sensor, the second pressure sensor, the third pressure sensor, the first temperature sensor, the second temperature sensor, and the displacement sensor are respectively connected to the data acquisition card.

[0057] Exemplarily, the host computer can facilitate the user to issue the control strategy of the solenoid valve test item to the controller. The controller can control the proportional amplifier to output current according to the control strategy, and control the actions of the first delivery pump, at least two solenoid valves, the second delivery pump, the first on-off control component, the second on-off control component, the third on-off control component, the overflow valve, the first temperature control system, and the second temperature control system, such as turning on, turning off, or adjusting the temperature, etc.

[0058] The first pressure sensor can detect the system pressure, the second pressure sensor can detect the solenoid valve inlet pressure, the third pressure sensor can detect the solenoid valve outlet pressure, the first temperature sensor can detect the ambient temperature in the test chamber, the second temperature sensor can detect the oil tank temperature, and the displacement sensor can detect the stroke of the active end so as to calculate the actual volume of the control chamber in the non-load simulated solenoid valve test and obtain the displacement response characteristics of the active end in the load simulated solenoid valve test.

[0059] Each sensor sends the measured sensor data to the data acquisition card, and the data acquisition card can send the sensor data to the controller for feedback control, or send the sensor data to the host computer for further data processing. In one embodiment, solenoid valve 1, solenoid valve 2, ..., solenoid valve N are installed in the test box as needed, and each solenoid valve can send current feedback to the controller. In another embodiment, a statistical process control (SPC) system can be run in the host computer. After receiving the sensor data sent by the data acquisition card, the SPC system can perform statistical calculations and analysis and display on all test items based on preset test standards and sensor data.

[0060] Specifically, after receiving the sensor data, the SPC system can first check whether there are missing values ​​and abnormal values ​​in the sensor data, and if there are missing values, generate a prompt message asking whether to retest the missing values, and if there are abnormal values, determine whether the system / tested solenoid valve is abnormal. After completing the missing values ​​and abnormal values, the data can be stratified according to the test conditions to analyze the impact of different factors on different types of solenoid valves. The SPC system can statistically analyze various parameters in accordance with ISO standards, and can provide process control charts, histograms, trend analysis charts and other charts, including median values, average values, standard deviations, XR, XS control charts, etc. It can calculate and evaluate performance indices such as the process capability index (CP), modified process capability index (CPK), process performance index (PP) and modified process performance index (PPK) of solenoid valves.

[0061] After completing statistical calculations and analysis displays, the SPC system can also generate data reports and send them to technical personnel through preset methods such as email, so that the technical personnel can analyze abnormal indicators and troubleshoot causes based on the data reports.

[0062] The solenoid valve testing method provided by the present invention will be described below. The solenoid valve testing method described below can be correspondingly referred to the solenoid valve testing system described above.

[0063] Figure 4 is a schematic flow chart of the solenoid valve testing method provided by the present invention. As Figure 4 shown, the system includes: Step 401, determine the target solenoid valve among at least two solenoid valves; Step 402, use the first delivery pump to deliver the hydraulic fluid in the fluid supply device to the target solenoid valve; Step 403, when the solenoid valve test of the target solenoid valve is load simulation, close the hydraulic channel between the control chamber and the fluid supply device, and use the target solenoid valve to deliver hydraulic fluid to the control chamber to obtain the displacement response characteristic of the movable end corresponding to the load simulation part, and the displacement response characteristic is used to characterize the performance test result of the target solenoid valve; or when the solenoid valve test of the target solenoid valve is non-load simulation, open the hydraulic channel between the control chamber and the fluid supply device, and use the target solenoid valve to deliver hydraulic fluid to the control chamber to obtain the pre-collected response characteristic, and the pre-collected response characteristic is used to characterize the performance test result of the target solenoid valve.

[0064] It can be understood that the displacement response characteristic and the pre-collected response characteristic are respectively used to characterize the test results of different performances of the target solenoid valve.

[0065] For the solenoid valve testing method provided by the embodiments of the present invention, by closing the hydraulic channel between the control chamber and the fluid supply device, the solenoid valve outputs hydraulic fluid to act on the movable end and the load simulation part, and controlling the movement of the movable end can at least test the pilot control type solenoid valve. By opening the hydraulic channel between the control chamber and the fluid supply device and fixing the movable end at a specified position, at least the flow type solenoid valve can be measured, so as to realize testing multiple types of hydraulic components in one test loop and reduce the consumption of resources such as manpower, material resources and time.

[0066] The volume of the control chamber has a great influence on the output performance of the solenoid valve. In order to test the output performance of the solenoid valve corresponding to different volumes of the control chamber, based on any of the above embodiments, before obtaining the pre-collected response characteristic by using the target solenoid valve to deliver hydraulic fluid to the control chamber, the method further includes: Open the first on-off control part, close the second on-off control part and the third on-off control part, and adjust the set pressure of the overflow valve to be higher than the rated pressure of the target solenoid valve; Use the second delivery pump to deliver hydraulic fluid to the auxiliary chamber, fix the movable end at a specified position, and determine the volume of the control chamber to obtain the pre-collected response characteristic corresponding to the control chamber with a fixed volume; Delivering hydraulic fluid to the control chamber through the target solenoid valve, the pre-acquisition response characteristics obtained include: Repeating the step of delivering hydraulic fluid to the auxiliary chamber through the second delivery pump, fixing the movable end at different positions to obtain the pre-acquisition response characteristics corresponding to the control chambers with different volumes. The pre-acquisition response characteristics include pressure-flow characteristics and step response characteristics.

[0067] It can be understood that in addition to the pressure-flow characteristics and step response characteristics under the fixed volume obtained in this embodiment, and the pressure-flow characteristics and step response characteristics under different volumes obtained by repeating the steps, the pre-acquisition response characteristics may also include internal leakage characteristics, stability characteristics and durability characteristics under actual harsh working conditions such as high and low temperatures, etc. that can be achieved by the solenoid valve test system in any of the foregoing embodiments, except for the displacement response characteristics.

[0068] In this embodiment, by fixing the movable end at different positions to obtain control chambers with different volumes, it is convenient to obtain the pressure-flow characteristics and step response characteristics corresponding to the control chambers with different volumes. Among them, the specific test steps for the pressure-flow characteristics and step response characteristics can be set according to the actual working conditions, and this embodiment does not further limit this.

[0069] Figure 5 It is the second flow chart of the solenoid valve test method provided by the present invention. As Figure 5 shown, in order to specifically illustrate the functions of the solenoid valve test method provided in this embodiment, a specific example is provided below.

[0070] After loading at least two solenoid valves to be tested into the test chamber, the test system can be started in the upper computer based on a user instruction; after the system starts, the switch / proportional valve and the pressure / flow control valve can be sequentially selected based on a user selection instruction to determine the type of the target solenoid valve; after determining the type of the target solenoid valve, the system can automatically give the corresponding test items, and the given test items can be added or deleted based on a project selection instruction given by the user, select the test items to determine the final test item list; after determining the test item list, the serial number of the solenoid valve to be tested can be determined based on the information input by the user through the input device or the scanning device, and the test task can be executed based on the test item list and the preset test rules corresponding to each test item therein, obtain the sensing data, and perform SPC analysis. The SPC system generates a data report and ends the test. Among them, the solenoid valve to be tested is the aforementioned target solenoid valve.

[0071] Among them, the test items may include pressure-flow characteristic test, step response test, proportional characteristic test, volume characteristic test, load response test, internal leakage test, stability test, durability test, etc. Further, the proportional characteristic test may include linearity, hysteresis and resolution, and the stability test may include oil temperature, ambient temperature and alternating pressure. During the execution of the test tasks, the durability test is performed in parallel with the pressure-flow characteristic test, step response test, proportional characteristic test, etc., and the test tasks other than the durability test are performed serially.

[0072] Specifically, when performing the pressure-flow characteristic test in the test tasks, under the control of the corresponding preset test rules, the first on-off control part and the third on-off control part can be opened, the second on-off control part can be closed, the set pressure of the overflow valve can be adjusted to be higher than the rated pressure of the target solenoid valve, so that the system is in the no-load condition, different flow rates can be adjusted through the speed control valve, the pressure difference between the inlet and outlet of the solenoid valve at different flow rates can be recorded, and the pressure-flow characteristic curve can be drawn.

[0073] When performing the step response test in the test tasks, under the control of the corresponding preset test rules, the first on-off control part and the third on-off control part can be opened, the second on-off control part can be closed, the set pressure of the overflow valve can be adjusted to be higher than the rated pressure of the target solenoid valve, so that the system is in the no-load condition, the time intervals for the pressure / flow rate to rise from 5% to 95% and to drop from 95% to 5% can be recorded to reflect the dynamic response time of the solenoid valve, the opening / closing response time under the rated pressure and rated current.

[0074] The proportional characteristic reflects the output control ability of the solenoid valve. When performing the proportional characteristic test in the test tasks, under the control of the corresponding preset test rules, the first on-off control part and the third on-off control part can be opened, the second on-off control part can be closed, the set pressure of the overflow valve can be adjusted to be higher than the rated pressure of the target solenoid valve, so that the system is in the no-load condition, the current of the proportional amplifier can be linearly output, the changes in pressure / flow rate during the increase / decrease of the current can be recorded, the proportional characteristic curve can be drawn, and the linearity, hysteresis, minimum current resolution, etc. can be calculated. The proportional amplifier can output parasitic flutter / independent flutter signals, and the hysteresis can be improved by adjusting the flutter parameters. And the proportional characteristic is not unique to proportional valves, and the output proportional characteristic of high-speed switching valves can be controlled by adjusting the PWM signal frequency and duty cycle.

[0075] When performing the volume characteristic test, load response test and internal leakage test in the test tasks, reference can be made to the relevant descriptions in the above embodiments, which will not be elaborated here.

[0076] When performing the stability test in the test task, under the control of the corresponding preset test rules, the first on-off control component can be opened in a harsh environment, the second on-off control component and the third on-off control component can be closed, and the set pressure of the overflow valve can be adjusted to change periodically to test the stability of the output performance under alternating pressure; the durability test is used to test the service life of the solenoid valve. When performing the stability test in the test task, under the control of the corresponding preset test rules, after the target solenoid valve is controlled to open and close frequently in a harsh environment, the change of the output performance can be tested. Among them, the harsh environment can set the specific temperature range by itself through the first temperature control system and the second temperature control system according to actual needs, and this embodiment does not make further limitations on this.

[0077] For the test task of the above system in the no-load condition, it can be determined whether to perform the corresponding test task under the load condition according to actual needs, and this embodiment does not make further limitations on this.

[0078] The solenoid valve control system and method provided by the embodiments of the present invention are applicable to on-off / proportional pressure / flow solenoid valves of different specifications, can adjust the flutter signal, study its influence on the proportional output performance of the solenoid valve, can simulate the influence of working conditions of different temperatures and alternating pressures on the output performance of the solenoid valve, can statistically analyze the test results based on the SPC system, is convenient for controlling product quality, etc., covers the test of key performance indicators, and can avoid problems such as overshoot and jitter of the product in the host application caused by single performance test.

[0079] In addition, the solenoid valve control system and method provided by the embodiments of the present invention can automatically execute the test task after the user inputs a simple instruction, which is convenient for improving the test efficiency of multiple solenoid valves and is applicable to prototype development and mass production factory testing. And the solenoid valve control system provided by the embodiments of the present invention has a simple structure and a wide application range.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A solenoid valve testing system, characterized in that, Comprising: A liquid supply device, a first transfer pump, at least two solenoid valves, and a control chamber, with at least two of the solenoid valves arranged in parallel; The liquid supply device is connected to the first transfer pump through a hydraulic channel, the first transfer pump is respectively connected to each solenoid valve through a hydraulic channel, each solenoid valve is respectively connected to the control chamber through a hydraulic channel, and the control chamber is connected to the liquid supply device through a hydraulic channel; the control chamber includes a movable end, and a load simulation member is connected outside the chamber of the movable end; In the case of load simulation, the hydraulic channel between the control chamber and the liquid supply device is closed, and the movable end moves under the action of the hydraulic fluid output by the target solenoid valve and the load simulation member to obtain the displacement response characteristic of the movable end corresponding to the load simulation member; in the case of non-load simulation, the hydraulic channel between the control chamber and the liquid supply device is opened, the movable end is fixed at a specified position, and the target solenoid valve is used to output hydraulic fluid to the control chamber to obtain a pre-acquired response characteristic representing the performance test result of the target solenoid valve.

2. The solenoid valve testing system according to claim 1, wherein It further includes an auxiliary chamber, and the movable end divides the accommodation chamber of the solenoid valve test system into the auxiliary chamber and the control chamber; the auxiliary chamber is provided with a return port, and the auxiliary chamber is connected to a second transfer pump.

3. The solenoid valve testing system according to claim 2, wherein The load simulation member is an elastic member, and the elastic member is connected between the movable end and the end of the auxiliary chamber away from the control chamber.

4. The solenoid valve testing system according to claim 3, wherein The connection between the elastic member and the movable end is a detachable connection.

5. The solenoid valve test system according to claim 1, wherein A first on-off control member is provided on the hydraulic channel between the first transfer pump and each solenoid valve, and a flow meter is provided on the hydraulic channel between the control chamber and the liquid supply device; The first transfer pump is also respectively connected to each solenoid valve through an internal leakage bypass hydraulic channel, and a micro flow meter and a second on-off control member are provided on the internal leakage bypass hydraulic channel.

6. The solenoid valve testing system according to claim 1, characterized in that, It further includes a test chamber, and at least two solenoid valves are arranged in the test chamber; a first temperature control system is provided in the test chamber; a second temperature control system is provided in the liquid supply device.

7. The solenoid valve testing system according to claim 1, wherein An overflow valve is provided on the hydraulic channel between the control chamber and the liquid supply device; the control type of the overflow valve is electromagnetic control type; The control chamber is also connected to the liquid supply device through an unloaded bypass hydraulic channel, and a third on-off control member is provided on the unloaded bypass hydraulic channel.

8. The solenoid valve test system according to any one of claims 1-7, characterized in that, It further includes a host computer, a data acquisition card, a controller, and a proportional amplifier, and the host computer is respectively connected to the data acquisition card and the controller; the controller is connected to the proportional amplifier; The proportional amplifier is respectively connected to the first transfer pump, at least two solenoid valves, the second transfer pump, the first on-off control member, the second on-off control member, the third on-off control member, the overflow valve, the first temperature control system, and the second temperature control system; A first pressure sensor is provided at the outlet of the first delivery pump, a second pressure sensor is provided at the inlet of the test chamber, a third pressure sensor is provided at the outlet of the test chamber, a first temperature sensor is provided inside the test chamber, a second temperature sensor is provided inside the fuel tank, and a displacement sensor is provided on the movable end of the control chamber; the first pressure sensor, the second pressure sensor, the third pressure sensor, the first temperature sensor, the second temperature sensor and the displacement sensor are respectively connected to the data acquisition card.

9. A solenoid valve testing method, characterized in that, Applied to the solenoid valve test system according to any one of claims 1-8, comprising: Determine the target solenoid valve among at least two solenoid valves; Deliver the hydraulic fluid in the liquid supply device to the target solenoid valve through the first delivery pump; When the solenoid valve test of the target solenoid valve is load simulation, close the hydraulic channel between the control chamber and the liquid supply device, and deliver the hydraulic fluid to the control chamber through the target solenoid valve to obtain the displacement response characteristic of the movable end corresponding to the load simulation part, and the displacement response characteristic is used to characterize the performance test result of the target solenoid valve; or When the solenoid valve test of the target solenoid valve is non-load simulation, open the hydraulic channel between the control chamber and the liquid supply device, and deliver the hydraulic fluid to the control chamber through the target solenoid valve to obtain the pre-acquisition response characteristic, and the pre-acquisition response characteristic is used to characterize the performance test result of the target solenoid valve.

10. The solenoid valve testing method according to claim 9, characterized in that, Before delivering the hydraulic fluid to the control chamber through the target solenoid valve to obtain the pre-acquisition response characteristic, the method further includes: Open the first on-off control member, close the second on-off control member and the third on-off control member, and adjust the set pressure of the relief valve to be higher than the rated pressure of the target solenoid valve; Deliver the hydraulic fluid to the auxiliary chamber through the second delivery pump, fix the movable end at a specified position, and determine the volume of the control chamber to obtain the pre-acquisition response characteristic corresponding to the control chamber with a fixed volume; Delivering the hydraulic fluid to the control chamber through the target solenoid valve to obtain the pre-acquisition response characteristic includes: Repeat the step of delivering the hydraulic fluid to the auxiliary chamber through the second delivery pump, and fix the movable end at different positions to obtain the pre-acquisition response characteristics corresponding to the control chambers with different volumes, and the pre-acquisition response characteristics include pressure-flow characteristics and step response characteristics.

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