Heating control method for electric carburizing furnace

A technology of heating control and electric furnace, applied in the direction of non-electric variable control, temperature control, control/regulation system, etc., which can solve the problems of backward carburizing electric furnace heating control technology, affecting product quality and output, and inability to continuously adjust furnace temperature. Achieve the effects of compact structure, strong isolation and stable operation

Inactive Publication Date: 2006-09-06
WAFANGDIAN BEARING GRP CO LTD
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Problems solved by technology

This not only wastes a lot of electric energy, but also the frequent input of high voltage and high current for a long time forms a thermal shock on the electric furnace heater - the electric radiant tube, which increases the heat load and reduces its service life
Every year, more than 20 electric radiant tubes are burned due to thermal shock. Due to its high price, it will cost more than 400,000 yuan to replace it once, and the maintenance time is long, which affec

Method used

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  • Heating control method for electric carburizing furnace
  • Heating control method for electric carburizing furnace
  • Heating control method for electric carburizing furnace

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Embodiment Construction

[0020] A combined and integrated thyristor variable time base power regulator is installed. The main circuit adopts three-phase control two-phase mode, and each control phase is composed of two ordinary unidirectional thyristors connected in antiparallel to form an AC non-contact switch, which is connected between the AC power supply and the electric furnace load.

[0021] The control circuit is composed of power supply, synchronous transformer, signal processing circuit, trigger circuit, etc., and the pulse transformer is replaced by a photoelectric coupling element, which has good matching and strong isolation. There is no positive or negative requirement for the connection between the instrument input signal and the actuator, and there is no wiring requirement for the connection between the controller and the main circuit thyristor switch. It has the function of component over-temperature protection and fast fuse blowout, thyristor breakdown and alarm function of phase loss...

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Abstract

The invention relates the carbonizing electric stove heating controlling mean. The method adopts the zero-cross triggering gate circuit transistor technology and carbonizing electric stove heating controlling mean, and the relay switch signal is replaced by the gate circuit transistor impulse signal. The gate circuit transistor receives the 0-10V or 4-20mA signal from temperature controller, then the output and input signal from zero-cross impulsion triggers gate circuit transistor to change the gate circuit transistor conducting and cut-off time to control the furnace temperature. The invention has the advantages of good economy, simple structure and easy maintenance. The invention suits to the carburizing furnace heating controlling field.

Description

technical field [0001] The invention belongs to the technical field of carburizing electric furnace heating control. Background technique [0002] The large-scale heat treatment equipment used for carburizing the surface of railway bearings --- carburizing electric furnace, its heating actuator adopts thyristor converter technology, which is composed of thyristor AC switch, connected with AC power supply and load. When working, the temperature regulator receives and amplifies the input temperature difference signal of the electric furnace, and sends a relay switch voltage signal to the gate of the thyristor to directly trigger the conduction of the thyristor to supply power to the electric furnace for heating. This electric furnace heating control method actually uses the leakage current of the thyristor cathode to trigger the conduction of the thyristor, which belongs to the strong trigger control method. [0003] Although this temperature control method is simple in struc...

Claims

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Application Information

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IPC IPC(8): C23C8/20G05D23/00
Inventor 李书乾
Owner WAFANGDIAN BEARING GRP CO LTD
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