We use Advantech IPC, Siemens S7-300PLC, American Leitai dual color infrared thermometer, Omron photoelectric switch, proximity switch, Siemens frequency converter, domestic electric proportional control valve; can guarantee high temperature control accuracy and The degree of automation; automatic control part, we designed the first set of heating equipment (750KW (1) heating furnace) for full power operation, and set the first infrared thermometer (1) at the outlet end to measure the first heating The temperature of the steel pipe heated by the furnace, and the power of the second heating furnace (1000 KW) is set at this temperature, and a second infrared thermometer (2) is set at the outlet end of the second heating furnace to control the temperature in a closed loop. The temperature control accuracy is up to ±5 °C; after the quenching liquid automatic sprinkler system, we set up a third infrared thermometer (3) its main function 1, the temperature of the steel pipe after the automatic spraying of the quenching liquid Perform measurement and compare with the set temperature. If it is higher or lower than the set temperature value, adjust the electric proportional control valve of the water spray system to the set temperature through the industrial computer; The temperature of the tube is measured and the power of the tempering line is set. At the exit end of the tempering production line, an infrared thermometer (4) is further set to perform closed-loop control on the temperature, so that the temperature control accuracy reaches the temperature accuracy requirement of ±5 °C;