ROCHO pit type furnace designed with temperature control system
Date: Aug 5th, 2022
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The electric pit furnace is designed with a temperature control system, and the working temperature range can reach 450-1100 ℃ for various vacuum heat treatments according to different designs.
The temperature control system is mainly composed of four parts: temperature sensor, temperature regulator, execution device, and controlled object. The controlled object is a large-capacity, large-inertia electric heating furnace temperature object, which is a typical multi-order volume delay characteristic. In engineering, it is often approximated as a second-order volume delay including pure lag; due to the large capacitance of the controlled object, usually, heat-treated thyristor is used as the actuator of the regulator. The temperature adjustment of the electric pit furnace is to change the ratio α of the electric pit furnace wire closing time Tb to the breaking time Tk through the intermittent action of the regulator (power supply energy), α=Tb/Tk.
To adjust the temperature of the pit furnace, the load is adjusted by turning on the circuit for several cycles and then disconnecting a few cycles within the set period to change the ratio of the on-off time of the thyristor within the set period. The average AC voltage at both ends is the load power, which is commonly referred to as a power regulator or a cycle controller; the power regulator triggers the conduction of the thyristor when the power supply voltage crosses zero, so the load gets a complete sine wave, what is adjusted is only the voltage cycle that is turned on in the set period Tc. Assuming that the wave number of the conduction in the period Tc is n, and the period of each cycle is T, the output power of the power regulator is P=n×T×Pn/Tc, and Pn is the time when the voltage is fully passed in the set period Tc output power of the device.
ROCHO's product range covers industrial heat treatment furnaces, laboratory furnaces, from forging furnaces, quenching furnaces, brazing furnaces, melting furnaces, muffle furnaces, and much more. With our professional technical knowledge and high quality services, ROCHO provide customers with solutions for different industrial application. If you would like to cooperate with us, please email us [email protected].
