Computer control system of heating furnace

Abstract

The invention discloses a computer control system of a heating furnace. An 8051 single-chip microcomputer serves as a kernel, the actual temperature in the electric heating furnace is measured by a thermocouple and converted into a voltage signal of the millivolt level, and the voltage signal is magnified to 0-5 V by an operational amplifier, filtered by an active low-pass filter, converted to bea digital value by a first A / D converter and displayed on a computer; after the digital value is subjected to digital filtering and scale conversion, the temperature value is compared with a controlled temperature value; and if the difference value is too large, an alarm gives out an alarm for reminding, a control worker can input a command via the computer, a digital signal is converted to be a voltage signal by a second A / D converter, and a drive execution mechanism executes temperature control over the heating furnace. The operational amplifier is additionally installed in a PID control circuit, so that the problem of errors of data transmission caused by fluctuation of electric signals during signal transmission is solved. Meanwhile, by additionally installing a gas circulation devicein the heating furnace, the situation that the temperature measured by the thermocouple is inaccurate is avoided.

Description

technical field [0001] The invention relates to the technical field of computer control systems, in particular to a computer control system for a heating furnace. Background technique [0002] Temperature is one of the most important parameters in industrial objects. Widely used in metallurgy, chemical industry, machinery, various heating furnaces, treatment furnaces and reaction furnaces and other industries. With the development of science and technology and the improvement of industrial production level, electric heating furnace has been widely used in various industrial controls such as metallurgy, chemical industry, machinery, etc., and occupies a pivotal position in the national economy. [0003] Today's heating furnace electric control basically adopts the PID control method. This control method is extremely inaccurate in measuring the temperature by the thermocouple due to the inconsistent internal temperature of the heating furnace. At the same time, the original c...

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Problems solved by technology

[0003] Today's heating furnace electric control basically adopts the PID control method. This control method is extremely inaccurate in measuring the temperature by the thermocouple due to the inconsistent internal temperature of the heating furnace. At the same time, the original control method often fails due to The fluctuation of the circuit leads to errors in the transmission process of the signal, so we propose a computer control system for the heating furnace

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