Medium frequency furnace is a kind of equipment used for casting, forging and hot processing, which is composed of frequency conversion device, furnace body and furnace front control. After converting three-phase power frequency alternating current into direct current, and then output into single medium frequency alternating current 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. The following is a detailed description of how to carry out safe operation.
1、 Precautions before opening
Before starting the medium frequency electric furnace, it is necessary to check the electrical equipment, water cooling system, inductor copper pipe, etc. only when these equipment are in good condition can the furnace be started 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, it is necessary to supervise the external conditions of the inductor and crucible, so as to prevent someone from touching the inductor and cable after power transmission, affecting the normal operation of the medium frequency electric furnace or causing safety accidents.
2、 Precautions after blowing in
After the medium frequency furnace is opened, the furnace charge shall be checked during charging to avoid mixing inflammable, explosive and other harmful substances. In order to prevent capping, it is strictly forbidden to directly add cold and wet materials into the molten steel, and it is not allowed to add bulky blocks after the molten liquid is filled to the upper part; 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 anywhere.
3、 Precautions during maintenance
During the maintenance of the medium frequency electric furnace, the medium frequency generator room should be kept clean, and inflammables and explosives are strictly prohibited to stack. Repair the furnace with excessive melting loss in time. When repairing the furnace, avoid the mixing of iron filings and iron oxide to ensure the compactness of the crucible.