Control system of pipe internal welding machine based on PLC

PI Yadong1, SUN Yunzhu2, DONG Qing1, ZHANG Hua1, LIANG Tianjun1, YU Jinzhu1
(1. China Petroleum Pipeline Reseach Institute, Langfang 056001, China;
2. Tongfang Kawasaki Airconditioning Co., Ltd., Langfang 056001, China)

Abstract: In order to solve the reliability and economy problems of the pipe internal welding machines control system, the research and development of foreign construction technology were reviewed seriously, the construction environment of our country was taken into account, then the modern control technology was applied to pipe engineering construction. Being improved for many times and using programmable logic controller(PLC) as controlling core of the system and control circuit of electric motor as peripheral circuit, the precision control of the movement of pipe internal welding machine was realized successfully. Because it is convenient to modify the program and is easy to realize interlock of various actions for PLC, the complexity of peripheral circuit was reduced. The control system was successfully utilized in the Second WestEast Gas Transmission Pipeline Project. Engineering practice indicates that the control system has a high reliability and is suitable for various complicated environment, the design target was reached.
Key words: internal welding machine; programmable logic controller(PLC); control circuit