"弯管机电气控制系统设计及PLC编程技术应用"

r, the pipe bending machine system provided by the power pipe fittings in Yanshan County, Cangzhou, Hebei, is used as the background for design and writing. The working principle, process flow, and software programming control of the pipe bending machine are introduced in detail. The characteristics and applications of the electrical control system are elaborated. The pipe bending machine is widely used in the petroleum industry and has also been applied in the West-East Gas Pipeline project developed by the country. It can be seen that the pipe bending machine occupies an important position in the machinery industry of my country, and its development also reflects the development of our industry. The modern pipe bending machine is characterized by large diameter and thick arm tube, and we use medium frequency hydraulic heating pipe bending machine to bend it accordingly. By using PLC to control the pipe bending machine and displaying temperature, speed, etc. on the upper computer, the quality and efficiency of the pipe bending can be better controlled. This paper introduces the working principle and simple process flow of the pipe bending machine, PLC structure, internal principle, and performance, as well as the internal structure of S7-200 and the use of it to write the control program for the pipe bending machine. The use of the S7-200 programmable controller is safer, more reliable, durable, intuitive, and flexible in application than relays and contactors in harsh environments. Finally, the STEP-7 programming software is used to write the ladder diagram control program for the pipe bending machine to control the temperature and speed required for bending. Keywords: Pipe bending machine; PLC; Control system; Software programming.