Analysis on the correct method of safe operation of medium frequency furnace

May 19, 2022

Medium frequency furnace is a kind of equipment used for casting, forging and hot processing. It is composed of frequency conversion device, furnace body and furnace front control. After converting three-phase power frequency AC into DC, and then output into single medium frequency AC through inverter circuit, the heat treatment of metal is realized according to the principle of electromagnetic induction. However, in order to ensure the efficient operation of the medium frequency furnace, it is necessary to carry out safe operation. Luoyang Wanle will describe in detail how to carry out safe operation.

1、 Precautions before starting

Before starting the medium frequency electric furnace, it is necessary to check the electrical equipment, water cooling system, inductor copper pipe, etc. the furnace can be started only when these equipment are in good condition to ensure the safety of heat treatment, otherwise it is prohibited to start the furnace; Determine the person specially responsible for power transmission and furnace opening, and the person in charge shall not leave the post without authorization. During the work, the external conditions of the inductor and crucible must be supervised to prevent someone from touching the inductor and cable after power transmission, affecting the normal operation of the medium frequency electric furnace or safety accidents.

2、 Precautions after startup

After the medium frequency furnace is started, when charging, the furnace charge shall be checked to avoid mixing flammable, explosive and other harmful substances. In order to prevent the phenomenon of capping, it is strictly prohibited to directly add cold and wet materials into the molten steel, and large blocks shall not be added after the molten liquid is filled to the upper part; In order to avoid explosion accidents, it is necessary to ensure that the pouring site and the pit in front of the furnace are free of ponding and obstacles; During pouring, two people need to cooperate, and the remaining molten steel can only be poured at the designated place, not everywhere.

3、 Precautions during maintenance

During the maintenance of medium frequency electric furnace, keep the medium frequency generator room clean and prohibit the stacking of inflammable and explosive articles. Repair the furnace with excessive melting loss in time. During furnace repair, avoid the mixing of iron filings and iron oxide to ensure the compactness of the crucible.