CN101813109B - Servo valve test system - Google Patents
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Abstract
The invention relates to a servo valve test system. By adopting a cartridge valve to automatically switch static and dynamic oil lines, the servo valve test system can realize the full automatic one-step test and intelligent analysis of the static properties and the dynamic properties of an electro-hydraulic servo valve, improves the test efficiency of the electro-hydraulic servo valve, and increases the accuracy of the test results. Strictly based on the test standard of the electro-hydraulic servo valve GB/T15623-1995, the whole test method completes all the detection tests of the servo valve, and automatically displays and outputs the test results. The servo valve test system mainly comprises a hydraulic test system, an electrical control system and a data acquisition and processing system, wherein a servo valve to be tested is connected with the hydraulic test system and the electrical control system; a main oil line of the hydraulic test system is automatically switched to the dynamic oil line and the static oil line by a cartridge valve assembly, and the hydraulic test system is also provided with a dynamic cylinder for detecting the servo valve to be tested; and the data acquisition and processing system is connected with the electrical control system and the hydraulic test system.
Description
Technical Field
The invention relates to a servo valve testing system.
Background
The electro-hydraulic servo control system is widely applied to important fields of power generation, metallurgy, aerospace and the like, and the electro-hydraulic servo valve is a core component of the electro-hydraulic servo control system, and is a signal conversion element and a power amplification element. The electro-hydraulic servo valve combines high-precision components of mechanical, electronic and hydraulic technologies, integrates the characteristics of electricity and hydraulic, and has the advantages of high control precision, high response speed, flexible signal processing, large output power, compact structure and the like. The performance of the electro-hydraulic control system directly influences the control precision, stability and reliability of the electro-hydraulic control system.
Due to the high precision of the electro-hydraulic servo valve and the key position in the electro-hydraulic servo control system, the detection of the servo valve has important significance for ensuring the performance index of the servo valve and ensuring the accurate, rapid and stable work of the electro-hydraulic servo system. Before each electro-hydraulic servo valve is used, parameters of the electro-hydraulic servo valve must be strictly tested by various instruments to check whether the performance reaches related indexes, so that the normal operation of a servo system can be ensured. In a unit or an important use occasion with a large amount of servo valves, a user should be provided with a servo valve test bench so as to recheck the performance of a new valve and perform a periodic recheck or comparison test on a used servo valve. The testing method mainly comprises an off-line test and an on-line test, the off-line test needs special test bed equipment, the testing precision is high, and the method is suitable for comprehensively testing and adjusting the servo valve. The on-line test is used for checking the working condition of the servo valve under the condition that the servo valve is not detached from the original equipment, is convenient, but is often limited by the application occasion of the servo valve and is not easy to realize.
Disclosure of Invention
The invention aims to solve the problems and provides an advanced servo valve test system, which adopts a cartridge valve to automatically switch static and dynamic oil ways, can realize full-automatic one-time test and intelligent analysis of static performance and dynamic performance of an electro-hydraulic servo valve, improves the test efficiency of the electro-hydraulic servo valve, increases the accuracy of test results, and completes various detection tests of the servo valve and automatically displays and outputs the test results according to the test standard GB/T15623 plus 1995 of the electro-hydraulic servo valve strictly.
In order to achieve the purpose, the invention adopts the following technical scheme:
a servo valve test system mainly comprises a hydraulic test system, an electrical control system and a data acquisition and processing system, wherein a tested servo valve is connected with the hydraulic test system and the electrical control system; the hydraulic test system is characterized in that a main oil way in the hydraulic test system is automatically switched into a dynamic oil way and a static oil way through a cartridge valve group, and a dynamic oil cylinder for detecting a servo valve to be tested is also arranged in the hydraulic test system; the data acquisition and processing system is connected with the electrical control system and the hydraulic test system.
The hydraulic test system comprises a main oil way, a control oil way and an oil pumping oil way which are respectively connected with three corresponding oil pumps, the whole hydraulic test system consists of an oil supply system and a test platform, and a tested servo valve is arranged on the test platform; wherein,
the main oil way comprises a basic oil way, a static oil way and a dynamic oil way:
the basic oil circuit comprises a main oil circuit oil suction filter, a main oil circuit oil pump, a main oil circuit pressure filter and a one-way valve which are connected in sequence
I. The main oil circuit comprises a safety overflow valve, a cooler and an oil return filter, wherein the oil return filter is connected with an oil tank;
the static oil way comprises a main oil way oil suction filter, a main oil way oil pump, a main oil way pressure filter and a one-way valve I which are sequentially connected, the one-way valve I is connected with a port P of a tested servo valve, a port A of the tested servo valve is connected with a first cartridge valve and a second cartridge valve of a cartridge valve group, the second cartridge valve is sequentially connected with a proportional flow valve, a flow meter, a third cartridge valve, a port B of the tested servo valve, a port T of the tested servo valve, a fourth cartridge valve, an oil return stop valve, a cooler and an oil return filter, and the oil return filter is connected with an oil tank; the flowmeter is connected with the data acquisition and processing system;
the dynamic oil way comprises a main oil way oil suction filter, a main oil way oil pump, a main oil way pressure filter and a one-way valve I which are sequentially connected, the one-way valve I is connected with a port P of a tested servo valve, a port A of the tested servo valve is connected with a first cartridge valve, the first cartridge valve is connected with a left cavity of the dynamic oil cylinder, a right cavity of the dynamic oil cylinder is connected with a fifth cartridge valve, the fifth cartridge valve is connected with a port B of the tested servo valve, a port T of the tested servo valve is connected with a fourth cartridge valve, the fourth cartridge valve is sequentially connected with an oil return stop valve, a cooler and an oil return filter, and the oil return filter is connected with an oil tank;
the main oil way pressure filter is also connected with an energy accumulator, and the energy accumulator is arranged between the main oil way safety overflow valve and the oil return stop valve;
the control oil passage includes: the control base oil way, the servo valve pilot stage oil way and the cartridge valve pilot stage oil way are divided into three parts; wherein, the control basic oil circuit comprises a control oil circuit oil suction filter, a control oil circuit oil pump, a control oil circuit pressure filter, a one-way valve II, a control oil circuit safety overflow valve, a cooler and an oil return filter which are sequentially connected, and the oil return filter) is connected with the oil tank;
the servo valve pilot-stage oil path comprises a control oil path oil suction filter, a control oil path oil pump, a control oil path pressure filter, a one-way valve II, a speed regulating valve, a stop valve I and an X port of the servo valve to be detected which are sequentially connected, and a Y port of the servo valve to be detected directly returns to the oil tank through the stop valve II;
the cartridge valve pilot-stage oil path comprises a control oil path oil suction filter, a control oil path oil pump, a control oil path pressure filter, a P port of a cartridge valve pilot-stage electromagnetic valve, a cartridge valve pilot-stage electromagnetic valve and a T port of the cartridge valve pilot-stage electromagnetic valve which are sequentially connected, and then the T port of the cartridge valve pilot-stage electromagnetic valve is connected with an oil tank;
the oil pumping oil way comprises an oil pumping oil filter of the oil pumping way and an oil pumping pump of the oil pumping way which are sequentially connected, the oil pumping oil filter of the oil pumping way is connected with an oil tank, and the oil pumping oil pump of the oil pumping way is connected with a recovery oil tank; the recovery oil tank is arranged on one side of the test platform;
the oil tank is provided with an oil tank oil drainage port, and a liquid level meter, a liquid thermometer and an air filter are installed on the oil tank.
The oil supply system comprises an oil tank support, an oil tank is arranged on the oil tank support, a cooler, an air filter and an oil return filter are arranged on the oil tank, a liquid level meter and a liquid temperature meter are arranged on the oil tank, the oil tank is also connected with a main oil line oil suction filter and a control oil line oil suction filter, the main oil line oil suction filter and the control oil line oil suction filter are respectively connected with a butterfly valve, and the butterfly valve is connected with an oil line; an armored integrated thermal resistor temperature transmitter is arranged in the oil tank; one side of the oil tank is also provided with a main oil way pressure filter, a control oil way pressure filter and two accumulators which are connected with an oil way; the bottom of the oil supply system is provided with a main oil line oil pump, a control oil line oil pump and an oil pumping line oil pump which are connected with a hose assembly, and the hose assembly is connected with an oil line through a pressure regulating valve group.
The test platform comprises a test bench, a tested servo valve is arranged on the test bench, and a recovery oil tank is arranged on one side of the test bench; a group of vibration-resistant pressure gauges are also arranged on the test platform and are connected with an oil way connected with the servo valve to be tested; and a dynamic oil cylinder is arranged below the tested servo valve, the dynamic oil cylinder is connected with the tested servo valve through an oil way, the dynamic oil cylinder is also connected with a control valve group A and a control valve group B, and the control valve group A is respectively connected with a vibration-resistant pressure gauge and the tested servo valve through a pressure measuring hose.
The data acquisition and processing system comprises at least one speed sensor, at least one displacement sensor, at least one pressure sensor, at least one data acquisition device and a data conversion and photoelectric isolation system; the displacement sensor and the speed sensor are arranged on two sides of the dynamic oil cylinder and connected with the data acquisition device; six pressure sensors are arranged, four of the pressure sensors are arranged on an oil way of the cartridge valve group, and the remaining two pressure sensors are arranged at the port A and the port B of the servo valve to be tested and are respectively connected with the measuring cup; the pressure sensor and the flowmeter are connected with the data acquisition device through a data conversion and photoelectric isolation system.
The data conversion and photoelectric isolation system comprises a current-voltage signal conversion circuit, a filter circuit and a photoelectric isolation circuit; the current-voltage signal conversion circuit is a resistor R2 which is connected with a capacitor C1 in parallel and converts the input current into a voltage signal of 2-10V; the filter circuit is an RC filter circuit consisting of a resistor R1 and a capacitor C1, and the circuit inhibits high-frequency signal interference above 1.6 KHz; the photoelectric isolation circuit comprises a digital input optical coupling isolation circuit, an input signal is processed and then sent to the data acquisition card, and an output signal of the data acquisition card controls the cartridge valve group through the digital output optical coupling isolation circuit.
The tested servo valve is connected with an electric control system through a servo amplifier.
The data acquisition device is a multifunctional data acquisition card adopting a PCI bus.
The electric control system comprises an electric control cabinet and a main control machine.
The invention has the beneficial effects that:
(1) the cartridge valve is used as an oil circuit switching control valve for the first time, so that the whole set of system has excellent performances of full automation, quick response, large flow and the like. The opening and closing of the cartridge valve are controlled by the electromagnetic directional valve, and the electrical control signal of the electromagnetic directional valve is output by the data acquisition card. The system uses plug-in valve cover plates of different types and has the functions of controlling a single oil way by a single valve and controlling multiple oil ways by the single valve.
(2) The idea of one-time testing of the static performance and the dynamic performance of the servo valve is put forward for the first time. At present, the existing servo valve test system at home and abroad separates a static performance test oil way from a dynamic performance test oil way, and a tested valve needs to be disassembled and replaced in the two oil ways during testing, so that the machine needs to be stopped, and hydraulic oil can be lost. The fully-automatic intelligent test and fault diagnosis test bed successfully developed by the invention completes the static and dynamic one-time installation test of the servo valve, automatically switches the static and dynamic oil paths by using the cartridge valve, simplifies the test steps and improves the automation degree of the system.
(3) Two detection modes are realized in the aspect of internal leakage fault diagnosis: selecting a measuring cup measuring mode under the condition that the internal leakage amount is small, and measuring the leakage oil amount in unit time by the measuring cup under the T port after the output signal of the servo valve is set every time; and selecting a flow meter measuring mode under the condition of larger internal flow, firstly opening an internal leakage detection oil way by a cartridge valve, automatically changing output signals supplied to a servo valve by software, recording leakage flow under each signal, and finally automatically drawing a complete leakage flow curve.
(4) All overflow valves, flow valves, sensors and the like used in the system are connected in a plate mode, a plurality of stainless steel valve blocks are designed, the pipeline connection of the system is greatly simplified, the vibration of the system is effectively reduced, the occupied area of the system is reduced, and the reliability of the whole system is improved.
(5) The designed test diagnosis analysis software has the functions of self-protection, full-automatic test, intelligent analysis and the like. And automatically monitoring the operation steps in real time in the process of each test, refusing to execute if misoperation occurs, automatically locking and protecting the system and jumping out of a warning prompt. In each test, only a mouse needs to be clicked for several times, the program can automatically complete the test, and performance parameter values such as pressure gain, linearity, hysteresis, flow gain and the like are automatically calculated.
(6) The test diagnosis system has the performance of acquiring analog signals at a high speed and refreshing analog quantity output at a high speed, and the frequency response test is realized by the data acquisition card through software calculation without additionally configuring a signal generator and a frequency response analyzer.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a view showing the structure of an oil passage of the present invention
FIG. 3a is a schematic view of an oil supply system;
FIG. 3b is a side view of FIG. 3 a;
FIG. 3c is a top view of FIG. 3 a;
FIG. 3d is a lower view of FIG. 3 a;
FIG. 4a is a schematic diagram of a test station;
FIG. 4b is a side view of FIG. 4 a;
FIG. 4c is a top view of FIG. 4 a;
FIG. 4d is a lower view of FIG. 4 a;
FIG. 5 is a schematic diagram of current-voltage signal conversion and RC filtering;
FIG. 6a is a schematic diagram of digital input optical coupling isolation;
fig. 6b is a digital output optical coupling isolation schematic diagram.
Wherein, 1-displacement sensor; 2-dynamic oil cylinder; 3-a speed sensor; 4-proportional flow valve; 5, a flow meter; 6-1 — a first cartridge valve; 6-2-second cartridge valve; 6-3-third cartridge valve; 6-4-fourth cartridge valve; 6-5-fifth cartridge valve; 7-a pressure sensor; 8, measuring the cup; 9-servo valve to be tested; 10-proportional relief valve; 11-speed regulating valve; 12-oil return stop valve; 13-recovery oil tank; 14-main oil way safety overflow valve; 15-an accumulator; 16-control oil circuit pressure filter; 17-control oil circuit oil pump; 18-control oil circuit oil suction filter; 19-main oil circuit pressure filter; 20-main oil circuit oil pump; 21-main oil line oil suction filter; 22-a cooler; 23-return oil filter; 24-a liquid level meter; 25-air filter; 26-liquid thermometer; 27-oil pumping circuit oil pump; 28-oil suction and oil filter of oil pumping path; 29-oil tank; 30-oil tank draining port; 31-one-way valve I; 32-a hydraulic test system; 33-an electrical control system; 34-a data acquisition and processing system; 35-an oil supply system; 36-test platform; 37-one-way valve II; 38-control oil way safety overflow valve; 39-oil tank support; 40-a hose assembly; 41-an electrical control cabinet; 42-a butterfly valve; 43-armored integrated thermal resistance temperature transmitter; 44-test bench; 45-vibration-resistant pressure gauge; 46-a servo amplifier; 47-stop valve I; 48-stop valve II; 49-cartridge valve pilot stage electromagnetic valve; 50-a main control machine; 51-control valve group A; 52-control valve group B; 53-data acquisition card; 54-data conversion and optoelectronic isolation system; 55-pressure measuring hose.
Detailed Description
The invention is further described with reference to the following figures and examples.
In fig. 1, it is mainly composed of a hydraulic test system 32, an electrical control system 33 and a data acquisition and processing system 34, and the servo valve 9 to be tested is connected with the hydraulic test system 32; the main oil path in the hydraulic test system 32 is divided into a dynamic oil path and a static oil path through a cartridge valve, and the hydraulic test system 32 is also provided with a dynamic oil cylinder 2 for testing the servo valve 9 to be tested; the data acquisition and processing system 34 is coupled to the hydraulic test system 32. The system can complete various detection tests in GB/T15623-.
In fig. 2, the hydraulic test system 32 includes a main oil path, a control oil path and an oil pumping oil path, which are respectively connected to three corresponding oil pumps, the whole hydraulic test system 32 is further divided into an oil supply system 35 and a test platform 36, and the tested servo valve 9 is installed on the test platform 36; wherein,
the main oil way comprises a basic oil way, a static oil way and a dynamic oil way:
the basic oil circuit comprises a main oil circuit oil suction filter 21, a main oil circuit oil pump 20, a main oil circuit pressure filter 19, a one-way valve I31, a main oil circuit safety overflow valve 14, a cooler 22 and an oil return filter 23 which are connected in sequence, wherein the oil return filter 23 is connected with an oil tank 29;
the static oil circuit comprises a main oil circuit oil suction filter 21, a main oil circuit oil pump 20, a main oil circuit pressure filter 19 and a one-way valve I31 which are sequentially connected, wherein the one-way valve I31 is connected with a port P of a tested servo valve 9, a port A of the tested servo valve 9 is connected with a first cartridge valve 6-1 and a second cartridge valve 6-2, the second cartridge valve 6-2 is sequentially connected with a proportional flow valve 4, a flow meter 5, a third cartridge valve 6-3, a port B of the tested servo valve 9, a port T of the tested servo valve 9, a fourth cartridge valve 6-4, an oil return stop valve 12, a cooler 22 and an oil return filter 23, and the oil return filter 23 is connected with an oil tank 29; the flowmeter 5 is connected with a data acquisition and processing system 34;
the dynamic oil way comprises a main oil way oil suction oil filter 21, a main oil way oil pump 20, a main oil way pressure filter 19 and a one-way valve I31 which are sequentially connected, wherein the one-way valve I31 is connected with a port P of a tested servo valve 9, a port A of the tested servo valve 9 is connected with a first cartridge valve 6-1, the first cartridge valve 6-1 is connected with a left cavity of a dynamic oil cylinder 2, a right cavity of the dynamic oil cylinder 2 is connected with a fifth cartridge valve 6-5, the fifth cartridge valve 6-5 is connected with a port B of the tested servo valve 9, a port T of the tested servo valve 9 is connected with a fourth cartridge valve 6-4, the fourth cartridge valve 6-4 is sequentially connected with an oil return stop valve 12, a cooler 22 and an oil filter 23, and the oil filter 23 is connected with an oil tank 29;
the main oil circuit pressure filter 19 is also connected with an energy accumulator 15, and another energy accumulator 15 is arranged between the main oil circuit safety overflow valve 14 and the oil return stop valve 12;
the control oil passage includes: the control base oil way, the servo valve pilot stage oil way and the cartridge valve pilot stage oil way are divided into three parts; the control basic oil circuit comprises a control oil circuit oil suction filter 18, a control oil circuit oil pump 17, a control oil circuit pressure filter 16, a one-way valve II37, a control oil circuit safety overflow valve 38, a cooler 22 and an oil return filter 23 which are sequentially connected, and the oil return filter 23 is connected with an oil tank 29;
the servo valve pilot stage oil path comprises a control oil path oil suction oil filter 18, a control oil path oil pump 17, a control oil path pressure filter 16, a one-way valve II37, a speed regulating valve 11, a stop valve I47 and an X port of the servo valve 9 to be detected which are sequentially connected, and a Y port of the servo valve 9 to be detected directly returns to the oil tank 29 through the stop valve II 48;
the cartridge valve pilot-stage oil path comprises a control oil path oil suction oil filter 18, a control oil path oil pump 17, a control oil path pressure filter 16, a P port of a cartridge valve pilot-stage electromagnetic valve 49, the cartridge valve pilot-stage electromagnetic valve 49 and a T port of the cartridge valve pilot-stage electromagnetic valve 49 which are sequentially connected, and then the T port of the cartridge valve pilot-stage electromagnetic valve 49 is connected with the oil tank 29;
the oil pumping circuit comprises an oil pumping circuit oil suction filter 28 and an oil pumping circuit oil pump 27 which are sequentially connected, wherein the oil pumping circuit oil suction filter 28 is connected with an oil tank 29, and the oil pumping circuit oil pump 27 is connected with a recovery oil tank 13; the recovery oil tank 13 is arranged on one side of the test platform 36;
the oil tank 29 is provided with an oil tank drain port 30, and is mounted with the liquid level gauge 24 and the liquid temperature gauge 26, and the air cleaner 25.
In fig. 3a, 3b, 3c and 3d, the oil supply system 35 includes a tank holder 39, an oil tank 29 is mounted on the tank holder 39, a cooler 22, an air cleaner 25 and a return oil filter 23 are mounted on the oil tank 29, a level gauge 24 and a liquid temperature gauge 26 are mounted on the oil tank 29, the oil tank 29 is further coupled to a main oil suction filter 21 and a control oil suction filter 18, the main oil suction filter 21 and the control oil suction filter 18 are coupled to a butterfly valve 42, respectively, and the butterfly valve 42 is coupled to an oil passage; an armored integrated thermal resistor temperature transmitter 43 is arranged in the oil tank 29; a main oil way pressure filter 19, a control oil way pressure filter 16 and two accumulators 15 are also arranged on one side of the oil tank 29 and are connected with the oil way; the bottom of the oil supply system 35 is provided with a main oil line oil pump 20, a control oil line oil pump 17 and an oil pumping line oil pump 27 which are connected with a hose assembly 40, and the hose assembly 40 is connected with the oil line through a pressure regulating valve bank.
In fig. 4a, 4b, 4c and 4d, the testing platform 36 includes a testing bench 44, the tested servo valve 9 is mounted on the testing bench 44, and the recovery oil tank 13 is arranged on one side of the testing bench 44; a group of vibration-resistant pressure gauges 45 are also arranged on the test platform 36, and the vibration-resistant pressure gauges 45 are connected with an oil way connected with the servo valve 9 to be tested; the dynamic oil cylinder 2 is arranged below the tested servo valve 9, the dynamic oil cylinder 2 is connected with the tested servo valve 9, the displacement sensor 1 and the speed sensor 3 are arranged on two sides of the dynamic oil cylinder 2, the dynamic oil cylinder 2 is further connected with a control valve group A51 and a control valve group B52, and the control valve group A51 is connected with the vibration-resistant pressure gauge 45 and the tested servo valve 9 through a pressure measuring hose 55.
The data acquisition and processing system 34 comprises a speed sensor 3, a displacement sensor 1, six pressure sensors 7, a data acquisition device and a data conversion and photoelectric isolation system 54; wherein, the displacement sensor 1 and the speed sensor 3 are arranged at two sides of the dynamic oil cylinder 2 and connected with the data acquisition device; four of the pressure sensors 7 are arranged on an oil path of the cartridge valve group, and the remaining two pressure sensors are arranged on an A port and a B port of the servo valve 9 to be tested and are respectively connected with the measuring cup 8; the pressure sensor 7 and the flowmeter 5 are connected with a data acquisition device through a data conversion and photoelectric isolation system 54.
The data conversion and optoelectronic isolation system 54 includes a current-voltage signal conversion, filtering circuit and optoelectronic isolation circuit; in fig. 5, the current-voltage signal conversion circuit is a resistor R2, which is connected in parallel with a capacitor C1 to convert the input current into a 2-10V voltage signal;
because the current signal has the advantages of long transmission distance and strong anti-interference capability, most of the sensors used in the test system are of a current signal output type, and the output current is 4-20 mA. The data acquisition card 53 can only receive voltage signals between-10V and +10V, so that current-voltage signal conversion is required. The input current signal is converted into a 2-10V voltage signal after passing through a precision resistor R2 (the resistance value is 0.5K, and the precision is 0.1%), and the voltage signal can be converted into a digital signal through a data acquisition card 53.
The filter circuit is an RC filter circuit consisting of a resistor R1 and a capacitor C1, and the circuit inhibits high-frequency signal interference above 1.6 KHz; in order to inhibit the influence of high-frequency noise interference on an analog signal in the surrounding environment, a simple and effective RC filter circuit is adopted. As shown in FIG. 5, the resistance of R1 is 10K, the capacitance of C1 is 0.01uF, and the circuit can suppress the interference of high frequency signals above 1.6KHz by substituting the low-pass filter formula.
In fig. 6a and 6b, the optoelectronic isolation circuit includes a digital input optical coupling isolation circuit, which processes the input signal and sends it to the data acquisition card, and the output signal of the data acquisition card controls the plug-in valve set through the digital output optical coupling isolation circuit.
In the testing system, the alarm signals of each oil filter and each pressure filter need to be detected, the signals are 24V digital switching value signals, and in order to avoid interference on a 5V level end of an acquisition card part, an optical coupling isolation circuit is designed, and the principle is shown in figure 6 a. In addition, the 24V level signal is required to control the electromagnetic directional valve and the electromagnetic overflow valve in the test system, so that the 5V switch level signal output by the acquisition card cannot directly drive the valve, and a digital output optical coupling isolation circuit is adopted, as shown in fig. 6 b.
The measured servo valve 9 is coupled to the electrical control system 33 via a servo amplifier 46. The servo amplifier provides various driving signals required by static and dynamic characteristic tests to the servo valve, and provides a vibration signal to prevent the servo valve from being stuck. The system selects G122-824-002 type servo amplifier of MOOG company, which is a general servo amplifier and can form a closed-loop control system with excellent performance such as position, speed, flow and the like together with an electro-hydraulic servo valve and an oil cylinder.
The data acquisition device is a multifunctional data acquisition card 53 using a PCI bus.
The electric control system 33 is an electric control cabinet 41 and a main control machine 50.
The data acquisition device is a multifunctional data acquisition card adopting a PCI bus. The traditional data acquisition card generally adopts an ISA bus, and the performance of a data acquisition control scheme is improved by the appearance of the data acquisition product adopting the PCI bus control technology at present. The PCI bus theory can reach the transmission speed of 132Mb/s, in addition, because PCI supports the function of 'Plug & Play' automatic configuration, the setting work of all resource requirements of the data acquisition card is processed by BIOS when the system is started, the user does not need to carry out switching and jumper operation, and the configuration is very convenient. Through comparison of multiple acquisition cards of multiple companies and combination of requirements of various aspects of the test system, a PCI-6229 multifunctional data acquisition card of the American NI company is selected.
The main parameters of PCI-6229 are as follows: : 32 paths of 16-bit precision A/D channels, the single channel has the maximum sampling frequency of 250KS/s, and the maximum voltage range is-10V- + 10V; 4 paths of 16-bit precision D/A channels, the single channel maximum output frequency 833KS/s, and the maximum voltage range of-10V- +10V are output; 2-way 32-bit timer counter, internal time base 80 MHz; 48 digital I/O channels. In addition, the board card is provided with 4KFIFO, supports three modes of software triggering, board card programmable timer triggering and external triggering, and supports three data transmission modes of inquiry, interruption and DMA.
The terminal board is CB-68LP of NI company. The external dimension is 14.35 multiplied by 10.74cm, 68 terminals. The connecting cable is SHC68-68-EPM shielded cable of NI company, and both ends of the cable are respectively provided with a 68-core connector which is respectively connected with the data acquisition card and the terminal board.
The pressure sensor 7 adopted by the test system is an ES400J pressure transmitter, and outputs a 4-20 mA current signal. The method has the characteristics of high precision, good long-term stability, strong reliability and the like; the stainless steel shell is packaged, the size is small, the installation is convenient, and various liquids and gases can be measured. All technical indexes meet the requirements of the test system.
The flow test of the electro-hydraulic servo valve is different from the flow test of other hydraulic elements, which is mainly represented by the following steps: firstly, the flow measurement of a hydraulic pump, a hydraulic motor and a common hydraulic valve generally does not require the direction to be tested, only the flow is required to be tested, and the flow and the direction of a servo valve are required to be tested simultaneously; secondly, in the no-load flow pressure drop test, the flow test of the servo valve is carried out under the condition of no-load, namely very low load pressure, so that the flow meter has to have extremely low starting pressure; thirdly, the flow meter must be able to withstand high pressures. The test system adopts a Germany VSE gear flowmeter to convert flow signals into electric pulse signals, and the signals are processed by a microcomputer after passing through an optical coupling isolation circuit to a data acquisition card, so that the test automation is realized. Two paths of pulse signals are output, and each liter of flow corresponds to 500 pulses.
Speed sensor and displacement sensor:
when the dynamic performance test of the electro-hydraulic servo valve is carried out, the output flow of the electro-hydraulic servo valve enters an oil cavity of a dynamic oil cylinder with small mass and low friction. The speed of the oil cylinder is in direct proportion to the flow output by the electro-hydraulic servo valve, and the speed of the oil cylinder is detected by a speed sensor driven by one end of the piston rod, so that the output 4-20 mA current signal is the flow signal of the valve to be detected.
The tested servo valve has original zero offset in the test process, the leakage of two cavities of the oil cylinder is inconsistent due to tolerance fit and the like during processing and assembly of the dynamic oil cylinder, the friction force between the piston and the cylinder barrel is asymmetric during left-right reciprocating motion, and the like. Therefore, a position closed-loop centering system is added in the test device, and a displacement sensor is added at the other end of the piston rod of the oil cylinder and is used as a detection element for the deviation of the piston from the middle position of the oil cylinder. Before the sine signal of each sweep frequency is output, the piston is adjusted to the middle position of the oil cylinder through the position closed-loop system.
Temperature sensor
Two temperature sensors are used in the system, wherein one temperature sensor is an armored integrated temperature sensor and is installed in an oil tank for detecting the temperature of oil in the oil tank, and the test range is-50-100 ℃. The other temperature sensor is an ES500 type temperature sensor produced by Shaanxi Qinming sensor Limited company, is arranged on a stainless steel valve block and is used for detecting the oil temperature of an oil inlet of a servo valve, and the test range is 0-100 ℃.
And (3) anti-interference design of a test system:
in a test site, because the controlled object and the tested signal are distributed in different places, a computer has a quite long distance from the controlled object and the tested signal; in addition, strong electric devices are arranged on the site, and the starting and the working processes of the devices generate strong interference on a computer. Such as magnetic fields generated by motors and other electrical equipment, various electromagnetic wave emissions, etc., and the existence and variation of these electromagnetic fields cause electrical interference to the test system and distortion of signals transmitted by the signal lines and control lines. If no anti-interference measures are taken, the computer cannot be used for testing the system. According to the practical situation of the system, the adopted anti-interference measures mainly comprise two points:
(1) and (4) designing grounding. The ground wire in the testing device is a zero level reference point common to all circuits, theoretically, the level of the ground wire should be the same, and because the points must be connected by a wire, when two ends of one wire are grounded at different points, the potential difference between the two points is not zero due to the internal resistance of the wire, which affects the input and output of the circuit. To overcome this effect, the chassis of all components in the test system are grounded at one point and isolate the digital and analog grounds in the circuit, suppressing interference of the digital signal with the analog signal.
(2) A shielding design is adopted. Since a plurality of signal sources need to be collected in a measurement system, noise interference, long-line transmission interference and the like are generated when signals are transmitted through electric wires (signal channels). The system employs shielded wires whose shielded cable layers ground the signals to eliminate interference of the signals.
The main control computer of the system takes LabVIEW8.5 as a platform, utilizes the powerful signal analysis and processing function thereof to program and realize a virtual signal generator, the signal is output to act on an electro-hydraulic servo valve through D/A conversion, the related signal is subjected to signal conversion through a sensor and is conditioned into a standard signal through a signal conditioning circuit, the standard signal is converted into a digital signal through A/D conversion, the signal is subjected to digitization processing such as smoothing window, digital filtering, nonlinear correction and calibration on the LabVIEW platform, the static characteristic and the dynamic characteristic of the signal are analyzed, the analysis result is output and displayed in the form of a graphical curve, and simultaneously, data are automatically stored in the test and a test report is generated. During the test, the signal waveform generated by the signal source and the signals collected on site are displayed on the display in real time through the software panel of the virtual instrument. Various performance parameters of the servo valve are calculated according to the sensor signals. And establishing a test record database, and storing the test result according to the factory serial number of the servo valve. According to the static and dynamic characteristic test requirements of the electro-hydraulic servo valve, the system is divided into a static characteristic test part and a dynamic characteristic test part. The static characteristic test mainly completes the tests of the load flow characteristic, the no-load flow characteristic, the pressure characteristic and the internal leakage characteristic of the electro-hydraulic servo valve; the dynamic characteristic test mainly completes the test of transient response and frequency response of the electro-hydraulic servo valve.
Claims (9)
1. A servo valve test system is characterized by mainly comprising a hydraulic test system (32), an electrical control system (33) and a data acquisition and processing system (34), wherein a tested servo valve (9) is connected with the hydraulic test system (32) and the electrical control system (33); the main oil way in the hydraulic test system (32) is automatically switched into a dynamic oil way and a static oil way through a cartridge valve group, the static oil way comprises a main oil way oil suction oil filter (21), a main oil way oil pump (20), a main oil way pressure filter (19) and a one-way valve I (31) which are sequentially connected, the one-way valve I (31) is connected with a port P of a tested servo valve (9), a port A of the tested servo valve (9) is connected with a first cartridge valve (6-1) with a cartridge valve pilot-level electromagnetic valve (49) and a second cartridge valve (6-2) with the cartridge valve pilot-level electromagnetic valve (49) of the cartridge valve group, the second cartridge valve (6-2) is connected with a proportional flow valve (4), a flow meter (5), a third cartridge valve (6-3), a port B of the tested servo valve (9), a port T of the tested servo valve (9) and a fourth cartridge valve (6-4) with the cartridge valve pilot-level electromagnetic valve (49), The oil return stop valve (12), the cooler (22) and the oil return oil filter (23) are sequentially connected, and the oil return oil filter (23) is connected with an oil tank (29); the flowmeter (5) is connected with the data acquisition and processing system (34);
the dynamic oil way comprises a main oil way oil suction oil filter (21), a main oil way oil pump (20), a main oil way pressure filter (19) and a one-way valve I (31) which are sequentially connected, the one-way valve I (31) is connected with a port P of a tested servo valve (9), a port A of the tested servo valve (9) is connected with a left cavity of the dynamic oil cylinder (2) through a first cartridge valve (6-1) with a cartridge valve pilot-level electromagnetic valve (49), a right cavity of the dynamic oil cylinder (2) is connected with a fifth cartridge valve (6-5), the fifth cartridge valve (6-5) is connected with a port B of the tested servo valve (9), a port T of the tested servo valve (9) is connected with a fourth cartridge valve (6-4) with the cartridge valve pilot-level electromagnetic valve (49), and a fourth cartridge valve (6-4) with the cartridge valve pilot-level electromagnetic valve (49) with the cartridge valve is connected with an oil return stop valve (12), The cooler (22) and the return oil filter (23) are sequentially connected, and the return oil filter (23) is connected with the oil tank (29); a dynamic oil cylinder (2) for detecting the servo valve (9) to be detected is also arranged in the hydraulic test system (32); the data acquisition and processing system (34) is connected with the electric control system (33) and the hydraulic test system (32).
2. The servo valve test system according to claim 1, wherein the hydraulic test system (32) comprises a main oil circuit, a control oil circuit and an oil pumping circuit, which are respectively connected with three oil pumps, the whole hydraulic test system (32) is composed of an oil supply system (35) and a test platform (36), and the servo valve (9) to be tested is mounted on the test platform (36); wherein,
the main oil way comprises a basic oil way, a static oil way and a dynamic oil way:
the basic oil circuit comprises a main oil circuit oil suction filter (21), a main oil circuit oil pump (20), a main oil circuit pressure filter (19), a one-way valve I (31), a main oil circuit safety overflow valve (14), a cooler (22) and an oil return filter (23) which are sequentially connected, wherein the oil return filter (23) is connected with an oil tank (29);
the main oil way pressure filter is also connected with an energy accumulator (15), and the energy accumulator (15) is arranged between the main oil way safety overflow valve (14) and the oil return stop valve (12);
the control oil passage includes: the control base oil way, the servo valve pilot stage oil way and the cartridge valve pilot stage oil way are divided into three parts; the control basic oil way comprises a control oil way oil suction filter (18), a control oil way oil pump (17), a control oil way pressure filter (16), a one-way valve II (37), a control oil way safety overflow valve (38), a cooler (22) and an oil return filter (23) which are sequentially connected, and the oil return filter (23) is connected with an oil tank (29);
the servo valve pilot stage oil path comprises a control oil path oil suction oil filter (18), a control oil path oil pump (17), a control oil path pressure filter (16), a one-way valve II (37), a speed regulating valve (11), a stop valve I (47) and an X port of a tested servo valve (9) which are sequentially connected, and a Y port of the tested servo valve (9) directly returns to the oil tank (29) through the stop valve II (48);
the cartridge valve pilot-stage oil path comprises a control oil path oil suction filter (18), a control oil path oil pump (17), a control oil path pressure filter (16), a P port of a cartridge valve pilot-stage electromagnetic valve (49), a T port of the cartridge valve pilot-stage electromagnetic valve (49) and a T port of the cartridge valve pilot-stage electromagnetic valve (49) which are sequentially connected, and then the T port of the cartridge valve pilot-stage electromagnetic valve (49) is connected with an oil tank (29);
the oil pumping way comprises an oil pumping way oil suction filter (28) and an oil pumping way oil pump (27) which are sequentially connected, the oil pumping way oil suction filter (28) is connected with an oil tank (29), and the oil pumping way oil pump (27) is connected with a recovery oil tank (13); the recovery oil tank (13) is arranged on one side of the test platform (36);
the oil tank (29) is provided with an oil tank drain port (30), and a liquid level meter (24), a liquid temperature meter (26) and an air filter (25) are installed.
3. The servo valve test system as recited in claim 2, wherein the oil supply system (35) includes an oil tank holder (39), an oil tank (29) is mounted on the oil tank holder (39), a cooler (22), an air cleaner (25), and a return oil filter (23) are mounted on the oil tank (29), a level gauge (24) and a liquid temperature gauge (26) are mounted on the oil tank (29), the oil tank (29) is further coupled to a main oil suction filter (21) and a control oil suction filter (18), the main oil suction filter (21) and the control oil suction filter (18) are respectively coupled to a butterfly valve (42), and the butterfly valve (42) is coupled to the oil passage; an armored integrated thermal resistor temperature transmitter (43) is arranged in the oil tank (29); one side of the oil tank (29) is also provided with a main oil way pressure filter (19), a control oil way pressure filter (16) and two accumulators (15) which are connected with an oil way; the bottom of the oil supply system (35) is provided with a main oil line oil pump (20), a control oil line oil pump (17) and an oil pumping line oil pump (27) which are connected with a hose assembly (40), and the hose assembly (40) is connected with an oil line through a pressure regulating valve group.
4. The servo valve testing system as claimed in claim 2, wherein the testing platform (36) comprises a test bench (44), the servo valve (9) to be tested is mounted on the test bench (44), and a recovery oil tank (13) is arranged on one side of the test bench (44); a group of vibration-resistant pressure gauges (45) are also arranged on the test platform (36), and the vibration-resistant pressure gauges (45) are connected with an oil way connected with the servo valve (9) to be tested; the dynamic oil cylinder (2) is arranged below the tested servo valve (9), the dynamic oil cylinder (2) is connected with the tested servo valve (9) through an oil way, the dynamic oil cylinder (2) is further connected with a control valve group A (51) and a control valve group B (52), and the control valve group A (51) is connected with a vibration-resistant pressure gauge (45) and the tested servo valve (9) through a pressure measuring hose (55).
5. The servo valve testing system according to claim 1, 2 or 4, wherein the data acquisition and processing system (34) comprises at least one speed sensor (3), at least one displacement sensor (1), at least one pressure sensor (7), at least one data acquisition device and a data conversion and opto-electronic isolation system (54); wherein, the displacement sensor (1) and the speed sensor (3) are arranged at two sides of the dynamic oil cylinder (2) and are connected with the data acquisition device; six pressure sensors (7) are arranged, four of the pressure sensors are arranged on an oil way of the cartridge valve group, and the remaining two pressure sensors are arranged at the port A and the port B of the tested servo valve (9) and are respectively connected with the measuring cup (8); the pressure sensor (7) and the flowmeter (5) are connected with a data acquisition device through a data conversion and photoelectric isolation system (54).
6. The servo valve test system of claim 5 wherein the data conversion and opto-electronic isolation system (54) comprises current-to-voltage signal conversion, filtering circuitry and opto-electronic isolation circuitry; the current-voltage signal conversion circuit is a resistor R2 which is connected with a capacitor C1 in parallel and converts the input current into a voltage signal of 2-10V; the filter circuit is an RC filter circuit consisting of a resistor R1 and a capacitor C1, and the circuit inhibits high-frequency signal interference above 1.6 KHz; the photoelectric isolation circuit comprises a digital input optical coupling isolation circuit, an input signal is processed and then sent to the data acquisition card, and an output signal of the data acquisition card controls the cartridge valve group through the digital output optical coupling isolation circuit.
7. A servo valve test system according to claim 1, wherein the servo valve (9) under test is coupled to the electrical control system (33) via a servo amplifier (46).
8. The servo valve test system according to claim 5, wherein the data acquisition device is a multifunctional data acquisition card (53) using a PCI bus.
9. The servo valve testing system according to claim 1 or 7, wherein the electrical control system (33) is an electrical control cabinet (41) and a main control machine (50).
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Address after: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee after: SHANDONG ELECTRIC POWER Research Institute Patentee after: STATE GRID CORPORATION OF CHINA Address before: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee before: SHANDONG ELECTRIC POWER Research Institute Patentee before: State Grid Corporation of China |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220129 Address after: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Patentee after: STATE GRID CORPORATION OF CHINA Address before: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee before: SHANDONG ELECTRIC POWER Research Institute Patentee before: STATE GRID CORPORATION OF CHINA |