Test of inlet proportional valve
Test of inlet proportional valve
A factory imported ⅱ -12r proportional valve from abroad. Because of its complex structure and high failure rate, in order to reduce losses, a ⅱ -12r proportional valve test system was developed.
1. Working principle
The ⅱ -12r proportional valve test system is mainly composed of console, starting cabinet, test bench, hydraulic pump unit, oil tank and pipeline auxiliary parts.
The control system adopts a dual computer structure, which is divided into upper computer and lower computer, and adopts a commercial computer (the configuration is: P Ⅲ 800/128m/30g/a4 color ink jet /17 hour color display /1.44m floppy disk drive /40x optical drive / mouse, keyboard, etc.); The lower computer adopts programmable controller imported from Mitsubishi of Japan (PLC for short, including d/i, d/o, D, d/a, serial port and other modules).
本系统的核心是PLC，它通过D模板采集压力、油温、流量等模拟量信号，通过D/I模板采集各种开关控制及状态信号，通过串行口接收上位机发来的各种指令，经程序处理后，由D/A模板输出模拟量控制信号，通过PWM板控制被试舵控仪的开度，自动控制电动机转速和比例溢流阀、比例流量控制阀来调节系统的油压及流量；通过D/O模板控制电动机的起、停及其他执行电器等，并且将采集的流量、压力、油温等数值经串行口回传给上位机，实时处理、显示试验数据和曲线，同时对试验数据进行记录。上位机采用菜单式工作界面，试验项目用鼠标点击确定，试验条件数据由键盘输入，试验后即可打印试验报告及曲线。控制系统如图31所示。
Start the motor 33 and the hydraulic pump 34 to suck oil from the oil tank through the oil suction filter 6. The high-pressure oil at the outlet of the hydraulic pump passes through the precision filter 31 to the pressure oil port of the accumulator 29 and the tested II -12r proportional valve 23, and the system pressure is adjusted by the electro-hydraulic proportional overflow valve 18; A rectifier valve block and an electro-hydraulic proportional flow valve 26 are connected between the two working oil ports of the ii-12r proportional valve to control the flow through the rudder control instrument. The return oil from the rudder control instrument returns to the oil tank through the flowmeter 19, cooler 17, return oil filter 9, etc. The hydraulic working principle is shown in Figure 32.
2. Main functions and technical indicators
(1) Display function.
1) The mechanical pressure gauge indicates the pressure of each oil port on the test system.
2) On the console, the real-time digital display of the working pressure of each oil port, the system oil temperature, the flow through the tested 12-12r proportional valve and various given control signals.
3) The hydraulic principle picture of each performance test, the position status of each ball valve, test data and test curve are displayed on the console in real time.
(2) Sound and light alarm function.
1) Filter differential pressure alarm.
2) The oil temperature is too high.
3) Low oil level alarm of oil tank.
4) System overpressure alarm.
5) Computer communication failure alarm.
(3) Main technical indicators.
1) Rated pressure; 10MPa。
2) Rated flow: 100l/min.
3) Oil tank volume: 1.2m3.
4) Power supply: AC 380V, 22.0kw, AC 220V, 3.0kw
5) Control signal; PWM signal, 400Hz, peak value ± 20V.
6) Working medium: steering gear hydraulic oil.
7) Cleanliness of working medium: not lower than grade 18/14 (gb/t 14039-1993).
8) Measurement accuracy; The pressure is ± 2.5%; The flow rate is ± 2.5%; The oil temperature is ± 2 ℃.
9) Temperature: 0 ~ 50 ℃.
10) Relative humidity: ≤ 85%.
3. Technical features
The system adopts the upper and lower computer control mode, applies sensor technology and digital analog and analog-to-digital, pressure frequency and pulse width adjustment technology, and realizes the interface conversion of 46 information such as liquid pressure and flow with the lower computer PLC. The test application software realizes the functions of online data acquisition, real-time processing, real-time display of test data and test curves, and can automatically print the verification report after verification, with a high degree of intelligence, Friendly man-machine interface.
The system can test all electro-hydraulic servo valves, electro-hydraulic proportional valves and electromagnetic directional valves with a rated pressure of no more than 10MPa and a rated flow of no more than 100l/min as long as it is equipped with the oil circuit input and output port adapter plates of the tested valve, which has the characteristics of wide versatility and strong expansibility.
