Research On Solenoid Valve Test System For Water Medium

Solenoid valve is an important actuator of industry control system, which is directly related to the security and reliability of the whole system. Consequently, it is very important to test the performance of solenoid valve products in their production, development and transformation.A suit of test system of solenoid valves for water medium is designed in this thesis, which can test the function of solenoid valves. The system contains:no-load test, action test, seal test, leak test, self-check test, kv test, flow resistance modulus test, response time test and life-span test for solenoid valves. And I have already used the system to test the solenoid valves for water medium. It proves that its operator interface is friendly and operator easily and tests accurately. The thesis has four parts as follow:(1) According to the test objective, it analyses the test principle of the solenoid's function and parameter. It designs test method and test procedure.(2)In order to make the test system rapid and accurate, I combine the advantages of many control theory and put forward Bang-Bang and PID control theory. If the pipes have leakage, I can use the PID control with dead band to compensate the leakage. The test shows that the compound control has shorter rise time and high steady-state precision. It has a very excellent control performance.(3) It designs the program in Labview and CX-Programmer, which is the programmable software of PLC. The thesis introduces the key technologies such as the communication between Industrial Computer and PLC, software interface, the collocation method of Data Acquisition Card.(4) I have already used the system to test solenoid valves. I analyze the result. The result shows the system is rapid and accurate. It meets the actual needs.