TU Chun hui1, NI Jing2, JIN Yong tao2, SHI Jian guo1, ZHOU Hai jiang1

 

(1. TKL Group Zhejiang Donggang Hydraulic Pressure machinery Co., Ltd., Zhuji 311811, China;

 

2. School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China)

 

 

Abstract: Aiming at the issues of test bed for the air dryer, such as poor automation, complex operation and low reliability, the testing process principle was analysed and summarized. The testing method of sealing characteristic, opening characteristic and discharge characteristic was researched. A novel automatic testing system was designed based on programmable logic controller (PLC) and human machine interface(HMI) technology. A novel electric control project, testing scheme and HMI were applied in the testing system. The air pressure of the system was automatically adjusted by the electric proportional valve. The state of the unloading valve was online monitored by comparing the air pressure difference. The detecting data was stored and computed automatically with the PLC. The testing results indicate that the designed system can greatly improve current testing process. The testing accuracy of key performance such as air tightness can be improved on 40 times. The testing time can be shortened as 1/6. The false testing rate can be decreased to 1/8. The workload of the testing personnel can be decreased to 1/10.

 

Key words: air dryer; automatic testing system; sealing characteristic testing; opening characteristic testing; discharge characteristic testing