Temperature cascade control system of casting holding furnace and control method of temperature cascade control system

Abstract

The invention discloses a temperature cascade control system of a casting holding furnace and a control method of the temperature cascade control system. The temperature cascade control system comprises the holding furnace, a furnace gas thermocouple, a metal liquid thermocouple, a combustion-supporting air adjusting valve, a wind-control air proportional valve, a combustion-supporting draught fan, a natural gas output port, a nozzle and a PLC. The nozzle is installed on the holding furnace and connected with the combustion-supporting draught fan through a pipe to form a first pipeline, and the nozzle is connected with the natural gas output port through a pipe to form a second pipeline. The wind-control air proportional valve is connected between the first pipeline and the second pipeline, and a combustion-supporting air adjusting valve is arranged between the wind-control air proportional valve and the combustion-supporting draught fan. The furnace gas thermocouple and the metal liquid thermocouple are connected with the input end of the PLC, and the output end of the PLC is connected with the combustion-supporting air adjusting valve. The temperature cascade control system is simple and reliable in control, collecting of the temperature of the furnace gas and the temperature of the metal liquid and controlling over the combustion-supporting air adjusting valve are automatically finished, the whole process is controlled in a closed-loop mode, the oxidation burning loss of the metal liquid in the furnace is effectively reduced, and the production cost is saved.

Description

technical field [0001] The invention relates to an automatic control system, in particular to a temperature cascade control system and a control method of a melting and casting holding furnace used on industrial production and processing lines. Background technique [0002] The holding furnace is the most widely used equipment in the melting and casting production line, and to ensure the quality of casting products, temperature control is a very important link. The traditional holding furnace temperature cascade control system includes a heat source, a temperature sensor, a controller and an actuator. The temperature sensor transmits the collected temperature data to the controller. Action, increase or decrease the temperature of the furnace gas in the holding furnace, so as to control the temperature of the molten metal by controlling the temperature of the furnace gas. Although the traditional method can meet the process requirements, when this control method controls the...

AI Technical Summary

Problems solved by technology

Although the traditional method can meet the process requirements, when this control method controls the temperature of the furnace gas, the temperature of the furnace gas fluctuates greatly, resulting in serious oxidation and burning of the molten metal. The loss is more serious, and the production cost also increases

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