Walking Beam Reheating Furnace And Heat Treatment Control System Design

Step type heating furnace of steel rolling is essential production equipment. How toimprove the heating furnace production efficiency is to improve the modern steel enterprisefuel utilization, energy saving face major problems to be solved. Seamless steel pipe plant tubeafter heating for steel pipe rolling and semi-finished tube, stepping furnace tube fuel usedmainly for natural gas or high coke mixed gas, its electrical control system used PLC as thecore, the temperature control with temperature, fuel, air flow series PID control.Based on the processing workshop of a seamless tube plant of walking beam reheatingfurnace as the research background, through the way of time-sharing multiplexing to enhancethe use efficiency of heating furnace, namely the use of maintenance time during production oflonger pause time and rolling equipment will be burning reheating furnace for heat treatmentregulation mode, the implementation of product pipe "quenching" or "quenching" processing toimprove product quality and increase the variety of products.Automatic control system for reasonable according to a seamless tube rolling mill plant ofwalking beam reheating furnace. Walking beam reheating furnace and heat treatment furnacestructure is basically the same, control form is basically the same, provided the conditions forautomation. Automatic control system of heating furnace which comprises a materialtransmission control system and the heating process control system of the former two parts,including: button, relay, contactor, limit switch, frequency converter to the main switch, aimingat the scene of the motor, hydraulic components of the action, ensure material operation andbelongs to the electric control; the latter includes: temperature collection, traffic data collection,pressure acquisition of analog quantity, ensure the material temperature of process control.This design adopts the industrial control computer is widely used in the rolling field formonitoring and control of the PC, PLC for the implementation of the core, the industrial localarea network for network equipment system connection platform. The whole system is dividedinto three layers: layer first is the infrastructure layer is composed of detection equipment, theimplementation of components; second layer is based on information, instruction transmissionlayer PLC and Profibus bus, connected with the I/O module and the operation of the site the site, receiving sensor to send letters, and operating instructions issued to the actuator the thirdlayer; PC control core layer by the operator station, engineer station and other equipment, canbe sent to the PLC control commands and parameters setting, it uses the MPI bus and PLCcommunication, at the same time, it also can be the regional management for the future and themanagement of higher layer provides information interface.This thesis constructed network system scheme based on field bus, and designs thehardware and software of the specific work, adjust the temperature and air combustion controlof furnace in, according to different requirements of the process using simple PID, cascadedouble cross, control strategy, enhances the stability of the heating system and anti interferenceability. The scientific transformation of the existing equipment so that with time divisionmultiplexing capability, and electrical control and process control uses a set of PLC, greatlysaves the hardware construction cost, energy consumption and improve the quality of the targeteffectively.