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2025-04-17 04:54 本頁(yè)面
【正文】 15 141723 22189 13A BPA BP10O s ta ti c a nd dy na m ic tes tin g s ys tem of elect ro hy dra ul ic servo valve1O According to the testing tems ,we install the valve to be tested on the static and dynamic testing board we execute a static test, we should close the switching valve 8, and open the valve 6 .On the contrary, turn on valve 8 , and turn down valve 6 when we do a dynamic test. Testing method of characteristics of unloaded flow 5 Operations are as follows,when we test the characteristics of unloaded ,close switch valve 18 and 7, and open valve 17 and should make sure the pressure difference between the two output ports A and B of the electrohydraulic servo valve △ PL=0. And then input trianglewave current signal with the frequency of into the valve being tested. The size of the current signal vary in accordance with the following rule: changes from 0 to +imax, then from +imax to 0, then to +imax , and back to flow meter 16 detects the flow in the process of the varying current and input the puter with the measured flow and corresponding puter can draw the curve of the flow varing with the current,namely the curve of the unloaded flow characteristics 177。 q = f (177。 i) △ pL = 0. And according to the measured data ,we can calculate valve flowgain, symmetry, zerodrift and hysteresis and other important properties of the valve. Test method of loadflow characteristics The operations of the test on loadflow characteristics are as follows: First, open switch valve 18 and 9, close the valves 17 and 7, make sure the oil of port A and B flows through the oneway valve 23 and proportional relief valve 22. Proportional relief valve (minimum moderating pressure ) can change the load pressure during the test,and the turbine flowmeter 16 can measure the flow under a variety of load operating conditions. To start the test,we should adjust the relief valve 3, make sure the pressure of the system is the same as the rated pressure of the electrohydraulic servo valve to be input the valve coil 6 being tested with a trianglewave current signal of ,and then control the proportional relief valve 22 to make the load pressure change gradually from zero to the rated pressure by a certain increment and measure the flow under each increment and input into the puter at the same time. And then change the amplitude of the input current (frequency unchanged), repeat the above process,we can measure curves of more is the characteristic curve of the load flow of electrohydraulic servo valve 177。 q = f (177。 △ PL) i = Cont. Test method of pressure characteristics Before the test, closed switch valve 17,18 and 7 and open the valve 9, make sure the output flow of the valve to be tested is adjust the pressure relief valve 3 so that the pressure of the system equals to the rated pressure and return oil pressure (measured by pressure sensor 13) . Then input the valve coil to be tested with a triangular wave current signal of puter reads the value of pressure transducer 14 and 15,so we can detect the pressure difference of the two out port of the servo the input current signal amplitude,and we can measure pressure value under different current curves can be sketched out,according to the value of current and pressure difference 177。 △ PL =f (177。 i) q =0. Testing method of leakage features Close switch valve 17,18 and 9,and open valve 7,then adjust the relief valve 3 to make the pressure of the system is the same as the rated pressure of the valve to 7 be input the valve coil with exciting current and measure the flow by flow transducer 5,and input the puter with the leak signal and rated exciting current signal after sampling. Leckage curves can be sketched out by the testing system qr = f (177。 i) . Test of dynamic characteristics According to the international standard , test of dynamic characteristics of current servo valve mainly refers to width of amplitude frequency when characteristic curve of amplitude frequency is 3dB and phasefrequency width when characteristic curve of phasefrequency is 90176。.We should use 10 sinusoidal signals of different frequiencies for exciting signals of the valve coil to be tested ,then measure the output flow signal in turn and f
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