An automatic bridge breaking device for vacuum induction melting furnace

Abstract

The invention relates to the technical field of metal smelting equipment, and discloses an automatic bridge breaking device for a vacuum induction smelting furnace. The device comprises a crucible; metal liquid is arranged in the crucible; a bridge above the metal liquid is arranged in the crucible; a movable piece positioned above the bridge is arranged in the crucible; an electric conducting cavity is formed in the movable piece; and an electric conducting ring is arranged in the electric conducting cavity. As short thorns are shorter than long thorns, the lower ends of the long thorns are firstly acted on the top surface of the bridge, so that the top surface stress area of the metal liquid is further reduced, and the acting force of the lower end of the long thorns on the top surface of the bridge is increased; the lower ends of the long thorns are firstly inserted in the bridge to improve the structure of the bridge; and then, the short thorns are inserted in the bridge to furtherchange the internal structure of the bridge, so that the bridge is automatically split to slide into the metal liquid, the bridge formed by blockage of burdens is broken, the manual breakage of the bridge by vacuum breakage is not needed, and the smelting efficiency is high.

Description

technical field [0001] The invention relates to the technical field of metal smelting equipment, in particular to an automatic bridge removal device for a vacuum induction smelting furnace. Background technique [0002] Vacuum induction melting furnace is a smelting equipment that first melts metal through induction current under vacuum conditions, and then pours the liquid metal into the mold to obtain metal ingots. It is mainly composed of three parts: power input system, vacuum system and furnace body. The furnace body includes a vacuum shell, induction coil, crucible, etc. The induction coil is wound outside the crucible. When working, an alternating current passes through the induction coil to generate an alternating magnetic field around the induction coil. The conductive material in the furnace is under the action of the alternating magnetic field. The induction potential is generated to form a current at a certain depth on the surface of the charge, that is, eddy cur...

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Problems solved by technology

[0003] 1. It is difficult to control the tightness of the charging material stacked in the crucible. Sometimes the upper charging material in the crucible is stacked too tightly and gets stuck. The metal molten pool is detached and cannot effectively transfer heat and melt. After breaking the vacuum, manually use tools such as long-handled hammers to break the bridge, and then vacuumize to continue melting. The operation process is very troublesome and the melting efficiency is low.

[0004] 2. Carbon and oxygen react violently under vacuum and high temperature, and the carbon monoxide gas produced is sprayed out from the molten metal, causing the molten metal to splash. Bonded with the inner wall of the crucible, the bridge is more solid. During the process of artificially breaking the bridge, the molten metal on the bridge is cooled and solidified, which further increases the firmness of the bridge. Elongated, low smelting efficiency

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