CN101813109A - 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 present invention relates to a kind of servo valve test system.
Background technique
Electrohydraulic servo-controlling system is widely used in key areas such as generating, metallurgy, Aero-Space, and electrohydraulic control is the core component of electrohydraulic servo-controlling system, is signal conversion element, is again power amplification element.Electrohydraulic control combines the high-precision parts of machinery, electronics and hydraulics, combines the electricity and the characteristics of hydraulic pressure two aspects, has the control accuracy height, speed of response is fast, signal processing is flexible, output power is big and advantage such as compact structure.Its performance quality directly has influence on control accuracy, stability and the reliability of electrohydraulic control system.
Because the high-precision of electrohydraulic control and the key position in electrohydraulic servo-controlling system, the detection of servovalve are for the performance index that guarantee servovalve and guarantee that accurate, quick, the stable work of electrohydraulic servo system has important meaning.Every electrohydraulic control must carry out the strictness test to its parameter through various instrument before use, and whether check feature reaches relevant index, could guarantee the normal operation of servo-system like this.Unit that the servovalve consumption is big or important use occasion, the user should be provided with the servovalve test bench, so that the performance of new valve is checked, and used servovalve is regularly reviewed or comparative test.Test method mainly is divided into off-line test and on-line testing, and off-line test needs special test bench installation, and the testing precision height is applicable to servovalve is comprehensively tested and adjustment.On-line testing is not separated at servovalve under the situation of original equipment carries out the operating mode inspection to it, though on-line testing is convenient, often is subjected to the restriction of servovalve applications occasion, is not easy realization.
Summary of the invention
Purpose of the present invention is exactly in order to address the above problem, a kind of advanced person's servo valve test system is provided, it adopts static, the dynamic oil circuit of cartridge valve automatic switchover, can realize the full-automatic disposable test and the intellectual analysis of electrohydraulic control static properties and dynamic performance, improve the efficient of electro-hydraulic servo valve test, increase the degree of accuracy of test result, whole test method strictness is according to the testing standard GB/T15623-1995 of electrohydraulic control, finish every detection test of servovalve, and show automatically and the output test result.
For achieving the above object, the present invention adopts following technological scheme:
A kind of servo valve test system, it mainly is made up of hydraulic test system, electric control system and data Collection ﹠ Processing System, and tested servovalve connects with hydraulic test system and electric control system; Wherein, the working connection in the hydraulic test system automatically switches to dynamic oil circuit and static oil circuit by the cartridge valve group, also is provided with the dynamic oil cylinder that tested servovalve is detected usefulness in hydraulic test system; Data Collection ﹠ Processing System and electric control system and hydraulic test system link.
Described hydraulic test system comprises working connection, control oil channel and oil pumping oil circuit, and they connect with corresponding three table oil pumps respectively, and whole hydraulic test system is made of oil supply system and test platform, and tested servovalve is installed on the test platform; Wherein,
Working connection comprises basic oil circuit, static oil circuit and dynamic oil circuit:
The basis oil circuit comprises successively working connection oil suction oil purifier, working connection oil pump, the working connection filter-press that connects), one-way valve I, working connection safety overflow valve, cooler, oil return oil purifier, the oil return oil purifier connects with fuel tank;
Static oil circuit comprises working connection oil suction oil purifier, working connection oil pump, working connection filter-press, the one-way valve I that connects successively, one-way valve I connects with the P mouth of tested servovalve, the A mouth of tested servovalve connects with the cartridge valve group, the cartridge valve group connects successively with T mouth, cartridge valve group, oil return stop valve, cooler, the oil return oil purifier of proportional flow control valve, flowmeter, cartridge valve group, the B mouth of tested servovalve, tested servovalve, and the oil return oil purifier connects with fuel tank; Flowmeter connects with data Collection ﹠ Processing System;
Dynamically oil circuit comprises working connection oil suction oil purifier, working connection oil pump, working connection filter-press, the one-way valve I that connects successively, one-way valve I connects with the P mouth of tested servovalve, the A mouth of tested servovalve connects with the cartridge valve group, the cartridge valve group connects with the left chamber of dynamic oil cylinder, dynamically the right chamber of oil cylinder connects with the cartridge valve group, the cartridge valve group connects with the B mouth of tested servovalve, the T mouth of tested servovalve connects with the cartridge valve group, the cartridge valve group connects successively with oil return stop valve, cooler, oil return oil purifier, and the oil return oil purifier connects with fuel tank;
The working connection filter-press also connects with an accumulator, is provided with an accumulator between working connection safety overflow valve and oil return stop valve;
Described control oil channel comprises: control basic oil circuit, servovalve pilot stage oil circuit, cartridge valve valve pilot stage oil circuit three parts; Wherein, control basic oil circuit and comprise that the control oil channel oil suction oil purifier, control oil channel oil pump, control oil channel filter-press, one-way valve II, control oil channel safety overflow valve, cooler, the oil return oil purifier that connect successively connect the oil return oil purifier successively) connect with fuel tank;
Servovalve pilot stage oil circuit comprises successively the X mouth of the control oil channel oil suction oil purifier that connects, control oil channel oil pump, control oil channel filter-press, one-way valve II, series flow control valve, stop valve I, tested servovalve, and the Y mouth of tested servovalve directly returns fuel tank through stop valve II;
Cartridge valve valve pilot stage oil circuit comprises successively P mouth, the cartridge valve pilot stage solenoid valve of the control oil channel oil suction oil purifier that connects, control oil channel oil pump, control oil channel filter-press, cartridge valve pilot stage solenoid valve, the T mouth of cartridge valve pilot stage solenoid valve, the T mouth connected tank of cartridge valve pilot stage solenoid valve then;
Described oil pumping oil circuit comprises oil pumping road oil suction oil purifier, the oil pumping road binders pump that connects successively, and oil pumping road oil suction oil purifier connects with fuel tank, and oil pumping road binders pump connects with the recovery fuel tank; Reclaim fuel tank and be installed in test platform one side;
Fuel tank is provided with the fuel tank drain tap, and level meter and liquid thermometer and air-strainer are installed.
Described oil supply system comprises tank support, fuel tank is installed on tank support, cooler, air-strainer and oil return oil purifier are installed on the fuel tank, level meter and liquid thermometer are installed on the fuel tank, fuel tank also connects with working connection oil suction oil purifier and control oil channel oil suction oil purifier, working connection oil suction oil purifier and control oil channel oil suction oil purifier connect with butterfly valve respectively, and butterfly valve then connects with oil circuit; In fuel tank, be provided with the integrated resistance and temperature transmitter of armouring; Fuel tank one side also is provided with working connection filter-press, control oil channel filter-press and two accumulators, and they connect with oil circuit; Working connection oil pump, control oil channel oil pump and oil pumping road binders pump then are installed in the bottom of oil supply system, and they connect with hose assembly, and hose assembly connects with oil circuit by the pressure regulator valve group.
Described test platform comprises test-bed, and tested servovalve is installed on test-bed, is provided with the recovery fuel tank in test-bed one side; Also be provided with one group of anti-pressure gauge that shakes on test platform, the anti-pressure gauge that shakes connects with the oil circuit that connects tested servovalve; Dynamic oil cylinder is installed below tested servovalve, and dynamically oil cylinder connects with tested servovalve by oil circuit, and dynamic oil cylinder also connects with control valve group A and control valve group B, and control valve group A connects with anti-pressure gauge and the tested servovalve of shaking respectively by the pressure measurement flexible pipe.
Described data Collection ﹠ Processing System comprises at least one velocity transducer, at least one displacement transducer, at least one pressure transducer, at least one data acquisition unit and data transfer and photoelectricity isolated system; Wherein, displacement transducer and velocity transducer are arranged on dynamic oil cylinder both sides and connect with data acquisition unit; Pressure transducer has six, wherein on the oil circuit that four are arranged on the cartridge valve group, remains two A mouth and B mouths that are located at tested servovalve, and connects with measuring cup respectively; Pressure transducer and flowmeter connect with data acquisition unit through data transfer and photoelectricity isolated system.
Described data transfer and photoelectricity isolated system comprise current-voltage signal conversion, eliminator and photoelectric isolating circuit; Wherein, the current-voltage signaling conversion circuit is a resistance R 2, and it is in parallel with capacitor C 1, and the electric current of importing is become 2 ~ 10V voltage signal; Eliminator is the RC eliminator that resistance R 1 and capacitor C 1 are formed, and this circuit suppresses the above high-frequency signal of 1.6KHz to be disturbed; Photoelectric isolating circuit comprises numeral input optical coupling isolation circuit, and it sends into data collecting card after input signal is handled, and the data collecting card output signal is through numeral output optical coupling isolation circuit control cartridge valve group.
Described tested servovalve connects with electric control system by servoamplifier.
Described data acquisition unit is for adopting the multifunctional data acquisition card of pci bus.
Described electric control system is electrical control cabinet and principal controller.
The invention has the beneficial effects as follows:
(1) adopts cartridge valve as the oil circuit switching control valve first, make whole system have automatically, respond fast, excellent properties such as flow is big.By the switching of solenoid directional control valve control cartridge valve, and the electrical control signal of solenoid directional control valve is exported by data collecting card.Use the cartridge valve cover plate of different model in the system, had the function that single valve is controlled single oil circuit and single valve control heavy wool road.
(2) thought that servovalve static properties and dynamic performance are once tested is proposed first.Present domestic and international existing servo valve test system is all tested static properties oil circuit and is separated with the dynamic performance testing oil circuit, tested valve dismounting and change in two oil circuits not only need be needed to shut down, and can lose hydraulic oil during test.This paper succeeds in developing the static and dynamic once mounting of servovalve and tests fully-automatic intelligent test and the fault diagnostic test platform of finishing, and uses cartridge valve automatic switchover static state, dynamic oil circuit, has simplified testing procedure and has improved the system automation degree.
(3) realized two kinds of detection modes for internal leakage fault diagnosis aspect: under the less situation of internal leakage, select the measuring cup metering system, after the output signal of a servovalve of every setting, the leakage oil mass of the counting cup meter under the T mouth in the unit time; Under the bigger situation of interior flow, select the flowmeter survey mode, at first cartridge valve is opened internal leakage and is detected oil circuit, software changes the output signal of supplying with servovalve automatically, and writes down leakage flow under each signal, draws out complete leakage flow curve at last automatically.
(4) relief valve of all uses, Flow valve, sensor etc. all adopt board-like connection in the system, designed a plurality of Stainless Steel Valve pieces, the pipeline of having simplified system greatly connects, and effectively reduces the vibrations of system, reduce system's floor space, improved the reliability of whole system.
(5) She Ji testing and diagnosing analysis software has functions such as self-protection, full-automatic testing, intellectual analysis.Carry out in real time automatic policer operation step in the process in each test, then refuse to carry out, system is locked protection automatically and jumps out warning prompt if any misoperation.Only need click mouse several times in each test, program can be finished test automatically, and calculates performance parameter values such as Pressure gain, the linearity, stagnant ring, flow gain automatically.
(6) test diagnosis system has the high speed acquisition analogue signal and refreshes the performance of analog amount output at a high speed, and frequency sound test is calculated by software by data collecting card and realizes, does not need other configuration signal generator and Frequency Response Analysis instrument.
Description of drawings
Fig. 1 is a system block diagram of the present invention;
Fig. 2 is oil channel structures figure of the present invention
Fig. 3 a is the oil supply system structural representation;
Fig. 3 b is the lateral plan of Fig. 3 a;
Fig. 3 c is the plan view of Fig. 3 a;
Fig. 3 d is the lower view of Fig. 3 a;
The structural representation of Fig. 4 a test bench;
Fig. 4 b is the lateral plan of Fig. 4 a;
Fig. 4 c is the plan view of Fig. 4 a;
Fig. 4 d is the lower view of Fig. 4 a;
Fig. 5 is current-voltage signal conversion and RC filtering principle figure;
Fig. 6 a is a numeral input light-coupled isolation schematic diagram;
Fig. 6 b is a numeral output light-coupled isolation schematic diagram.
Wherein, 1-displacement transducer; 2-dynamically oil cylinders; 3-velocity transducer; 4-proportional flow control valve; 5-flowmeter; 6-cartridge valve group; 7-pressure transducer; 8-measuring cup; 9-tested servovalve; 10-proportional pressure control valve; 11-series flow control valve; 12-oil return stop valve; 13-recovery fuel tank; 14-working connection safety overflow valve; 15-accumulator; 16-control oil channel filter-press; 17-control oil channel oil pump; 18-control oil channel oil suction oil purifier; 19-working connection filter-press; 20-working connection oil pump; 21-working connection oil suction oil purifier; 22-cooler; 23-oil return oil purifier; 24-level meter; 25-air-strainer; 26-liquid thermometer; 27-oil pumping road binders pump; 28-oil pumping road oil suction oil purifier; 29-fuel tank; 30-fuel tank drain tap; 31-one-way valve I; 32-hydraulic test system; 33-electric control system; 34-data Collection ﹠ Processing System; 35-oil supply system; 36-test platform; 37-one-way valve II; 38-control oil channel safety overflow valve; 39-tank support; 40-hose assembly; 41-electrical control cabinet; 42-butterfly valve; The integrated resistance and temperature transmitter of 43-armouring; 44-test-bed; 45-anti-the pressure gauge that shakes; 46-servoamplifier; 47-stop valve I; 48-stop valve II; 49-cartridge valve pilot stage solenoid valve; 50-principal controller; 51-control valve group A; 52-control valve group B; 53-data collecting card; 54-data transfer and photoelectricity isolated system; 55-pressure measurement flexible pipe.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Among Fig. 1, it mainly is made up of hydraulic test system 32, electric control system 33 and data Collection ﹠ Processing System 34, and tested servovalve 9 connects with hydraulic test system 32; Wherein, the working connection in the hydraulic test system 32 is divided into dynamic oil circuit and static oil circuit by cartridge valve group 6, also is provided with the dynamic oil cylinder 2 of tested servovalve 9 being tested usefulness in hydraulic test system 32; Data Collection ﹠ Processing System 34 connects with hydraulic test system 32.This system can finish the every detection test among the GB/T15623-1995 (electrohydraulic control test method), as partially zero and drift test, internal leakage test, no load discharge test, flow load pressure drop test, transient response test etc.
Among Fig. 2, hydraulic test system 32 comprises working connection, control oil channel and oil pumping oil circuit, and they connect with corresponding three table oil pumps respectively, and whole hydraulic test system 32 is divided into oil supply system 35 and test platform 36 again, and tested servovalve 9 is installed on the test platform 36; Wherein,
Working connection comprises basic oil circuit, static oil circuit and dynamic oil circuit:
The basis oil circuit comprises working connection oil suction oil purifier 21, working connection oil pump 20, working connection filter-press 19, one-way valve I31, working connection safety overflow valve 14, cooler 22, the oil return oil purifier 23 that connects successively, and oil return oil purifier 23 connects with fuel tank 29;
Static oil circuit comprises working connection oil suction oil purifier 21, working connection oil pump 20, working connection filter-press 19, the one-way valve I31 that connects successively, one-way valve I31 connects with the P mouth of tested servovalve 9, the A mouth of tested servovalve 9 connects with cartridge valve group 6, cartridge valve group 6 connects successively with B mouth, the T mouth of tested servovalve 9, cartridge valve group 6, oil return stop valve 12, cooler 22, the oil return oil purifier 23 of proportional flow control valve 4, flowmeter 5, cartridge valve group 6, tested servovalve 9, and oil return oil purifier 23 connects with fuel tank 29; Flowmeter 5 connects with data Collection ﹠ Processing System 34;
Dynamically oil circuit comprises the working connection oil suction oil purifier 21 that connects successively, working connection oil pump 20, working connection filter-press 19, one-way valve I31, one-way valve I31 connects with the P mouth of tested servovalve 9, the A mouth of tested servovalve 9 connects with cartridge valve group 6, cartridge valve group 6 connects with dynamic oil cylinder 2 left chambeies, dynamically oil cylinder 2 right chambeies connect with cartridge valve group 6, cartridge valve group 6 connects with the B mouth of tested servovalve 9, the T mouth of tested servovalve 9 connects with cartridge valve group 6, cartridge valve group 6 and oil return stop valve 12, cooler 22, oil return oil purifier 23 connects successively, and oil return oil purifier 23 connects with fuel tank 29;
Working connection filter-press 19 also connects with an accumulator 15, and 12 of working connection safety overflow valve 14 and oil return stop valves are provided with another accumulator 15;
Described control oil channel comprises: control basic oil circuit, servovalve pilot stage oil circuit, cartridge valve valve pilot stage oil circuit three parts; Wherein, control basic oil circuit and comprise that the control oil channel oil suction oil purifier 18, control oil channel oil pump 17, control oil channel filter-press 16, one-way valve II37, control oil channel safety overflow valve 38, cooler 22, the oil return oil purifier 23 that connect successively connect successively, oil return oil purifier 23 connects with fuel tank 29;
Servovalve pilot stage oil circuit comprises successively the X mouth of the control oil channel oil suction oil purifier 18 that connects, control oil channel oil pump 17, control oil channel filter-press 16, one-way valve II37, series flow control valve 11, stop valve I47, tested servovalve 9, and the Y mouth of tested servovalve 9 directly returns fuel tank 29 through stop valve II48;
Cartridge valve valve pilot stage oil circuit comprises successively P mouth, the cartridge valve pilot stage solenoid valve 49 of the control oil channel oil suction oil purifier 18 that connects, control oil channel oil pump 17, control oil channel filter-press 16, cartridge valve pilot stage solenoid valve 49, the T mouth of cartridge valve pilot stage solenoid valve 49, the T mouth connected tank 29 of cartridge valve pilot stage solenoid valve 49 then;
Described oil pumping oil circuit comprises oil pumping road oil suction oil purifier 28, the oil pumping road binders pump 27 that connects successively, and oil pumping road oil suction oil purifier 28 connects with fuel tank 29, and oil pumping road binders pump 27 connects with recovery fuel tank 13; Reclaim fuel tank 13 and be installed in test platform 36 1 sides;
Among Fig. 3 a, Fig. 3 b, Fig. 3 c and Fig. 3 d, oil supply system 35 comprises tank support 39, fuel tank 29 is installed on tank support 39, cooler 22, air-strainer 25 and oil return oil purifier 23 are installed on the fuel tank 29, level meter 24 and liquid thermometer 26 are installed on the fuel tank 29, fuel tank 29 also connects with working connection oil suction oil purifier 21 and control oil channel oil suction oil purifier 18, and working connection oil suction oil purifier 21 and control oil channel oil suction oil purifier 18 connect with butterfly valve 42 respectively, and 42 of butterfly valves connect with oil circuit; In fuel tank 29, be provided with the integrated resistance and temperature transmitter 43 of armouring; Fuel tank 29 1 sides also are provided with working connection filter-press 19, control oil channel filter-press 16 and two accumulators 15, and they connect with oil circuit; Working connection oil pump 20, control oil channel oil pump 17 and oil pumping road binders pump 27 then are installed in the bottom of oil supply system 35, and they connect with hose assembly 40, and hose assembly 40 connects with oil circuit by the pressure regulator valve group.
Among Fig. 4 a, Fig. 4 b, Fig. 4 c, Fig. 4 d, test platform 36 comprises test-bed 44, and tested servovalve 9 is installed on test-bed 44, is provided with in test-bed 44 1 sides and reclaims fuel tank 13; Also be provided with one group of anti-pressure gauge 45 that shakes on test platform 36, the anti-pressure gauge 45 that shakes connects with the oil circuit that connects tested servovalve 9; Dynamic oil cylinder 2 is installed below tested servovalve 9, dynamically oil cylinder 2 connects with tested servovalve 9, dynamically oil cylinder 2 both sides are provided with displacement transducer 1 and velocity transducer 3, dynamically oil cylinder 2 also connects with control valve group A51 and control valve group B52, and control valve group A51 connects with anti-pressure gauge 45 and the tested servovalve 9 of shaking respectively by pressure measurement flexible pipe 55.
Data Collection ﹠ Processing System 34 comprises a velocity transducer 3, displacement transducer 1, six pressure transducers 7, data collecting device and a data transfer and a photoelectricity isolated system 54; Wherein, displacement transducer 1 and velocity transducer 3 are arranged on dynamic oil cylinder 2 both sides and connect with data acquisition unit; In the pressure transducer 7 four are arranged on the oil circuit of cartridge valve group 6, remain two and are located at the A of tested servovalve 9 mouth and B mouth, and connect with measuring cup 8 respectively; Pressure transducer 7 and flowmeter 5 connect with data acquisition unit through data transfer and photoelectricity isolated system 54.
Data transfer and photoelectricity isolated system 54 comprise current-voltage signal conversion, eliminator and photoelectric isolating circuit; Among Fig. 5, the current-voltage signaling conversion circuit is a resistance R 2, and it is in parallel with capacitor C 1, and the electric current of importing is become 2 ~ 10V voltage signal;
Because current signal has long transmission distance, the advantage that antijamming capability is strong, the sensor major part of using in the test system is the current signal output type, output current 4 ~ 20mA.And data collecting card 53 can only receive-10V ~+voltage signal between the 10V, therefore need carry out the current-voltage signal conversion.The current signal of input is through precision resistance R2(resistance 0.5K, precision 0.1%) after, become 2 ~ 10V voltage signal, can be converted into digital signal by data collecting card 53.
Eliminator is the RC eliminator that resistance R 1 and capacitor C 1 are formed, and this circuit suppresses the above high-frequency signal of 1.6KHz to be disturbed; Disturb influence in order to suppress high-frequency noise under the surrounding environment, adopted simple and effective RC eliminator analogue signal.As shown in Figure 5, the R1 resistance is 10K, C1 capacitance 0.01uF, and substitution lower pass-filter formula obtains, and this circuit can suppress the above high-frequency signal of 1.6KHz to be disturbed.
Among Fig. 6 a, Fig. 6 b, photoelectric isolating circuit comprises numeral input optical coupling isolation circuit, and it sends into data collecting card after input signal is handled, and the data collecting card output signal is through numeral output optical coupling isolation circuit control cartridge valve group 6.
Need to detect the alarm signal of each oil purifier and filter-press in this test system, signal is the digital switch quantity signal of 24V, for avoiding that the 5V level end of capture card part is produced interference, has carried out the optical coupling isolation circuit design, and principle is shown in Fig. 6 a.Need in this automatic checkout system by 24V level signal control solenoid directional control valve and electromagnetic relief valve, so the 5V switch level signal of capture card output can not directly drive valve, thus digital output optical coupling isolation circuit adopted, shown in Fig. 6 b.
Tested servovalve 9 connects with electric control system 33 by servoamplifier 46.Servoamplifier provides to servovalve and satisfies static and the required various drive signals of dynamic characteristic test, and the chatter signal is provided, and prevents that servovalve is stuck.Native system is selected the G122-824-002 type servoamplifier of MOOG company for use, and it is universal servoamplifier, can be with closed loop control systems such as the good position of electrohydraulic control and oil cylinder component property, speed, flows.
Data acquisition unit is for adopting the multifunctional data acquisition card 53 of pci bus.
Data acquisition unit is for adopting the multifunctional data acquisition card of pci bus.Traditional data collecting card generally adopts isa bus, and adopts the appearance of the data capture product of pci bus control technique to improve the performance of data acquisition control scheme now.The pci bus theory can reach the transmission speed of 132Mb/s, in addition because PCI supports " Plug﹠amp; Play " automatic configuration feature, the setting of all resource requirements of data collecting card is operated in and transfers to the BIOS processing when system just opens, and need not the user carry out switch and wire jumper operation, disposes very convenient.Through to many moneys capture card of many companies relatively and in conjunction with the each side requirement of this test system, the PCI-6229 multifunctional data acquisition card of America NI company is selected in decision for use.
The major parameter of PCI-6229 is as follows:: 32 tunnel 16 precision A/D passages, the maximum sample frequency 250KS/s of single channel, input maximum voltage range-10V-+10V; 4 tunnel 16 precision D/A passages, the maximum output frequency 833KS/s of single channel, output maximum voltage range-10V-+10V; 2 tunnel 32 bit timing counters, internal timebase 80MHz; 48 way word I/O passages.Integrated circuit board has 4KFIFO in addition, and support software triggers, the integrated circuit board programmable timer triggers and three kinds of modes of external trigger, supports inquiry, interruption and three kinds of data transfer modes of DMA.
Terminal board is selected the CB-68LP of NI company for use.Boundary dimension 14.35X10.74cm, 68 terminals.Tie cable is selected the SHC68-68-EPM shielded cable of NI company for use, and these cable two ends have the connector of one 68 core respectively, links to each other with terminal board with data collecting card respectively.
The pressure transducer 7 that this test system adopts is ES400J type pressure transmitters, output 4 ~ 20mA current signal.Have characteristics such as precision height, long time stability are good, good reliability; The stainless steel casing encapsulation, volume is small and exquisite, and is easy for installation, can measure various liquids and gases.Its each technical order satisfies the requirement of this test system.
The flux test of electrohydraulic control and the flux test of other hydraulic element are different, this mainly shows: the one, in the flow measurement of oil hydraulic pump, oil hydraulic motor and common hydrovalve, generally do not require its direction of test, only require the size of test traffic, and the flow of servovalve is wanted detected magnitude and direction simultaneously; The 2nd, in the no load discharge pressure drop test, the flux test of servovalve is to carry out under the low-down condition of induced pressure in " zero load ", so flowmeter must have extremely low breakout pressure; The 3rd, flowmeter must be high pressure resistant.This test system is selected German VSE gear meter for use, makes flux signal be converted into electrical pulsing signal, signal through optical coupling isolation circuit to the data collecting card by microcomputer processing, realized test automation.Two pulse signals output, corresponding 500 pulses of every up-flow amount.
Velocity transducer and displacement transducer:
When carrying out the electrohydraulic servo valve dynamic performance test, the output flow of electrohydraulic control enters the oil pocket that quality is little, hang down the dynamic oil cylinder of friction.The speed of oil cylinder is directly proportional with the flow of electrohydraulic control output, and the speed of oil cylinder then detects by the velocity transducer that piston rod one end drives, and therefore 4 ~ 20mA current signal of output is the flux signal of tested valve.
Because tested servovalve exists original zero partially in the process of the test, it is inconsistent that reasons such as tolerance fit when dynamically oil cylinder is owing to processing and assembling cause oil cylinder two chambeies to leak, factor such as frictional force is asymmetric when the to-and-fro motion of the left and right sides between piston and the cylinder barrel, when system under the excitation of sine sweep signal, when moving reciprocatingly, piston can depart from its original neutral position gradually, until bumping against an end, test can't be carried out at last.In testing apparatus, increased by a cover position closed loop centering system for this reason, added a displacement transducer, be used as the Detecting element that piston departs from the oil cylinder meta at the other end of oil cylinder piston bar.Before each sweep sine output, adjust piston to the oil cylinder meta by this position closed loop system earlier.
Temperature transducer
Used two temperature transducers in the system, wherein one is armour shape integrated temperature sensor, is installed in the fuel tank, is used for detecting oil temperature in the fuel tank, test specification-50 ~ 100
oC.Other one is the ES500 type temperature transducer that Shaanxi Qin Ming sensor Co., Ltd produces, be installed in Stainless Steel Valve fast on, be used for detecting the oil temperature of servovalve filler opening, test specification 0 ~ 100
oC.
The Anti-interference Design of test system:
In test site, because controlled device is distributed in different places with measured signal, computer and quite long distance is also arranged between them; There is heavy current installation at the scene in addition, and their startup and working procedure produce strong interference to computer.Magnetic field that produces as motor and other electrical equipment and various electromagenetic wave radiations etc., the existence of these electromagnetic fields and variation make test system electrical interference occur, the distorted signals of signaling line and guide line transmission.As not taking interference protection measure, computer can't be used for test system.According to the actual conditions of native system, the interference protection measure of taking mainly contains 2 points:
(1) ground connection design.Ground wire in the testing apparatus is the public zero-level reference points of all circuit, the level of ground wire should be identical in theory, because of connecting with lead between the each point, so when lead two ends during difference ground connection, because the lead internal resistance causes 2 potential differences non-vanishing, this will influence the input and output of circuit.For overcoming this influence, the casing of all parts in the test system is ground connection on one point, and with digitally keeping apart with simulation ground in the circuit, suppress the interference of digital signal to analogue signal.
(2) adopt the shielding design.Owing to need to gather a plurality of signal sources in the measuring system, signal can produce noise interference, long line transmission interference etc. when transmitting by electric wire (signalling channel).So the interference that system has adopted shielding wire to come erasure signal, the shielded cable layer ground signalling of shielding wire.
The principal controller of native system is platform with LabVIEW8.5, utilize its powerful signal analysis and processing function, programming realizes virtual signal generator, signal is changed output action to electrohydraulic control through D/A, relevant signal carries out signal conversion through sensor, nurse one's health into standard signal through signal conditioning circuit again and convert digital signal to through A/D, and on the LabVIEW platform, signal is carried out smoothing windows, digital filtering, digitized processing such as gamma correction and demarcation, its static characteristic and dynamic characteristic are analyzed, analysis result shows with the form output of graphical curve, automatically preserve data simultaneously in the test, and generate test report.Duration of test, the signal waveform that signal source produces and the signal of collection in worksite, all the software panel by virtual instrument shows in real time on display device.Calculate the various performance parameters of servovalve according to sensor signal.Set up the test record database, preserved test result according to the sequence number that dispatches from the factory of servovalve.According to the quiet dynamic characteristic test requirement of electrohydraulic control, system is divided into static characteristic test and dynamic characteristic test two-part.Electrohydraulic control load flow characteristic, no load discharge characteristic, Pressure characteristics, internal leakage characteristic test are mainly finished in the static characteristic test; Dynamic characteristic test is mainly finished electrohydraulic control transient response and frequency response test.
Claims (9)
1. servo valve test system, it is characterized in that, it mainly is made up of hydraulic test system (32), electric control system (33) and data Collection ﹠ Processing System (34), and tested servovalve (9) connects with hydraulic test system (32) and electric control system (33); Wherein, the working connection in the hydraulic test system (32) automatically switches to dynamic oil circuit and static oil circuit by cartridge valve group (6), also is provided with the dynamic oil cylinder (2) that tested servovalve (9) is detected usefulness in hydraulic test system (32); Data Collection ﹠ Processing System (34) links with electric control system (33) and hydraulic test system (32).
2. servo valve test system as claimed in claim 1, it is characterized in that, described hydraulic test system (32) comprises working connection, control oil channel and oil pumping oil circuit, they connect with corresponding three table oil pumps respectively, whole hydraulic test system (32) is made of oil supply system (35) and test platform (36), and tested servovalve (9) is installed on the test platform (36); Wherein,
Working connection comprises basic oil circuit, static oil circuit and dynamic oil circuit:
The basis oil circuit comprises successively working connection oil suction oil purifier (21), working connection oil pump (20), working connection filter-press (19), the one-way valve I(31 that connects), working connection safety overflow valve (14), cooler (22), oil return oil purifier (23), oil return oil purifier (23) connects with fuel tank (29);
Static oil circuit comprises the working connection oil suction oil purifier (21) that connects successively, working connection oil pump (20), working connection filter-press (19), one-way valve I(31), one-way valve I(31) the P mouth with tested servovalve (9) connects, the A mouth of tested servovalve (9) connects with cartridge valve group (6), cartridge valve group (6) and proportional flow control valve (4), flowmeter (5), cartridge valve group (6), the B mouth of tested servovalve (9), the T mouth of tested servovalve (9), cartridge valve group (6), oil return stop valve (12), cooler (22), oil return oil purifier (23) connects successively, and oil return oil purifier (23) connects with fuel tank (29); Flowmeter (5) connects with data Collection ﹠ Processing System (34);
Dynamically oil circuit comprises the working connection oil suction oil purifier (21) that connects successively, working connection oil pump (20), working connection filter-press (19), one-way valve I(31), one-way valve I(31) the P mouth with tested servovalve (9) connects, the A mouth of tested servovalve (9) connects with cartridge valve group (6), cartridge valve group (6) connects with the left chamber of dynamic oil cylinder (2), dynamically the right chamber of oil cylinder (2) connects with cartridge valve group (6), cartridge valve group (6) connects with the B mouth of tested servovalve (9), the T mouth of tested servovalve (9) connects with cartridge valve group (6), cartridge valve group (6) and oil return stop valve (12), cooler (22), oil return oil purifier (23) connects successively, and oil return oil purifier (23) connects with fuel tank (29);
The working connection filter-press also connects with an accumulator (15), is provided with an accumulator (15) between working connection safety overflow valve (14) and oil return stop valve (12);
Described control oil channel comprises: control basic oil circuit, servovalve pilot stage oil circuit, cartridge valve valve pilot stage oil circuit three parts; Wherein, control basic oil circuit and comprise successively control oil channel oil suction oil purifier (18), control oil channel oil pump (17), control oil channel filter-press (16), the one-way valve II(37 that connects), control oil channel safety overflow valve (38), cooler (22), oil return oil purifier (23) connect successively, oil return oil purifier (23) connects with fuel tank (29);
Servovalve pilot stage oil circuit comprises successively control oil channel oil suction oil purifier (18), control oil channel oil pump (17), control oil channel filter-press (16), the one-way valve II(37 that connects), series flow control valve (11), stop valve I(47), the X mouth of tested servovalve (9), the Y mouth of tested servovalve (9) is through stop valve II(48) directly return fuel tank (29);
Cartridge valve valve pilot stage oil circuit comprises successively P mouth, the cartridge valve pilot stage solenoid valve (49) of the control oil channel oil suction oil purifier (18) that connects, control oil channel oil pump (17), control oil channel filter-press (16), cartridge valve pilot stage solenoid valve (49), the T mouth of cartridge valve pilot stage solenoid valve (49), the T mouth connected tank (29) of cartridge valve pilot stage solenoid valve (49) then;
Described oil pumping oil circuit comprises oil pumping road oil suction oil purifier (28), the oil pumping road binders pump (27) that connects successively, and oil pumping road oil suction oil purifier (28) connects with fuel tank (29), and oil pumping road binders pump (27) connects with recovery fuel tank (13); Reclaim fuel tank (13) and be installed in test platform (36) one sides;
Fuel tank (29) is provided with fuel tank drain tap (30), and level meter (24) and liquid thermometer (26) and air-strainer (25) are installed.
3. servo valve test system as claimed in claim 2, it is characterized in that, described oil supply system (35) comprises tank support (39), go up installation fuel tank (29) at tank support (39), fuel tank (29) is gone up cooler (22) is installed, air-strainer (25) and oil return oil purifier (23), level meter (24) and liquid thermometer (26) are installed on the fuel tank (29), fuel tank (29) also connects with working connection oil suction oil purifier (21) and control oil channel oil suction oil purifier (18), working connection oil suction oil purifier (21) and control oil channel oil suction oil purifier (18) connect with butterfly valve (42) respectively, and butterfly valve (42) then connects with oil circuit; In fuel tank (29), be provided with the integrated resistance and temperature transmitter of armouring (43); Fuel tank (29) one sides also are provided with working connection filter-press (19), control oil channel filter-press (16) and two accumulators (15), and they connect with oil circuit; Working connection oil pump (20), control oil channel oil pump (17) and oil pumping road binders pump (27) then are installed in the bottom of oil supply system (35), and they connect with hose assembly (40), and hose assembly (40) connects with oil circuit by the pressure regulator valve group.
4. servo valve test system as claimed in claim 2, it is characterized in that, described test platform (36) comprises test-bed (44), and tested servovalve (9) is installed on test-bed (44), is provided with in test-bed (44) one sides and reclaims fuel tank (13); Also be provided with one group of anti-pressure gauge that shakes (45) on test platform (36), the anti-pressure gauge that shakes (45) connects with the oil circuit that connects tested servovalve (9); In the below of tested servovalve (9) dynamic oil cylinder (2) is installed, dynamically oil cylinder (2) connects with tested servovalve (9) by oil circuit, dynamically oil cylinder (2) also with control valve group A(51) and control valve group B(52) connect control valve group A(51) connect with anti-pressure gauge that shakes (45) and tested servovalve (9) respectively by pressure measurement flexible pipe (55).
5. as claim 1 or 2 or 4 described servo valve test systems, it is characterized in that described data Collection ﹠ Processing System (34) comprises at least one velocity transducer (3), at least one displacement transducer (1), at least one pressure transducer (7), at least one data acquisition unit and data transfer and photoelectricity isolated system (54); Wherein, displacement transducer (1) and velocity transducer (3) are arranged on dynamic oil cylinder (2) both sides and connect with data acquisition unit; Pressure transducer (7) has six, wherein on the oil circuit that four are arranged on cartridge valve group (6), remains two A mouth and B mouths that are located at tested servovalve (9), and connects with measuring cup (8) respectively; Pressure transducer (7) and flowmeter (5) connect with data acquisition unit through data transfer and photoelectricity isolated system (54).
6. servo valve test system as claimed in claim 5 is characterized in that, described data transfer and photoelectricity isolated system (54) comprise current-voltage signal conversion, eliminator and photoelectric isolating circuit; Wherein, the current-voltage signaling conversion circuit is a resistance R 2, and it is in parallel with capacitor C 1, and the electric current of importing is become 2 ~ 10V voltage signal; Eliminator is the RC eliminator that resistance R 1 and capacitor C 1 are formed, and this circuit suppresses the above high-frequency signal of 1.6KHz to be disturbed; Photoelectric isolating circuit comprises numeral input optical coupling isolation circuit, and it sends into data collecting card after input signal is handled, and the data collecting card output signal is through numeral output optical coupling isolation circuit control cartridge valve group.
7. servo valve test system as claimed in claim 1 is characterized in that, described tested servovalve (9) connects with electric control system (33) by servoamplifier (46).
8. servo valve test system as claimed in claim 5 is characterized in that, described data acquisition unit is for adopting the multifunctional data acquisition card (53) of pci bus.
9. as claim 1 or 7 described servo valve test systems, it is characterized in that described electric control system (33) is electrical control cabinet (41) and principal controller (50).
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|---|---|---|---|
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| CN101813109B CN101813109B (en) | 2012-03-21 |
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| CN110778556A (en) * | 2019-11-05 | 2020-02-11 | 燕山大学 | High-pressure multi-way valve reliability test bench and test method based on same |
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| CN113638937A (en) * | 2021-06-02 | 2021-11-12 | 北京精密机电控制设备研究所 | Automatic test system of hydraulic source |
| CN114109949A (en) * | 2021-11-16 | 2022-03-01 | 大连海事大学 | Digital twin optimization control system and method for valve port independent control electro-hydraulic system |
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