Top-buried type salt bath furnace started by working electrodes

Abstract

The invention relates to a top-buried type salt bath furnace started by working electrodes. An L-shaped left working electrode (12), an L-shaped right working electrode (17) and a middle working electrode (16) are buried at the bottom of a furnace chamber, wherein the L-shaped left working electrode (12) and the L-shaped right working electrode (17) are opposite, and the middle working electrode (16) is positioned between the left working electrode and the right working electrode; the left working electrode, the right working electrode and the middle working electrode are all in a welding structure of steel plates superimposing two end parts (3); an insulating mica sheet (11) is clamped at the middle section between every two layers of superimposed steel plates; three groups of inlet electrodes (13, 14 and 15) and contact electrodes (8, 9 and 10) which are arranged in an one-to-one correspondence way are longitudinally inserted along a furnace wall; the bottom ends of the three pairs of inlet electrodes and contact electrodes are respectively connected with the left working electrode, the right working electrode and the middle working electrode, and the top ends extend out of the furnace wall; the top ends of the three contact electrodes are transversely connected with dismountable copper bars (18); and the three inlet electrodes are connected with a power source. In the invention, the working electrodes can be used for starting the salt bath furnace for heating without an auxiliary starting resistor and can enable the salt bath furnace to be kept in a working state, and the operation process is simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of heat treatment equipment and technology. Background technique [0002] Salt bath furnace is a common heat treatment furnace that uses salt bath medium to heat workpieces. At room temperature, salt is in a solid state, and solid salt is not conductive. The salt is melted into liquid salt, and the molten salt is connected to another working electrode, and the temperature of the molten salt is raised to the working temperature by using the resistance heat effect of the molten salt, and the starting resistor is taken out from the furnace after the salt is completely melted, and then the workpiece is processed. Heat treatment work, after the work is completed, put the starting resistor back into the salt bath furnace to cool and solidify to normal temperature with the furnace, and repeat the above steps for the next work. Its technological operation is cumbersome, and the workman's labor is light and heavy, a...

AI Technical Summary

Problems solved by technology

The process operation is cumbersome, and the labor is light and heavy for workers, which affects work efficiency

In addition, the starting resistors used in the existing salt-bath furnaces are generally made of spiral or folded strips wound with Ф16-20mm low-carbon round steel. The disadvantage is that it is easy to deform and burn out, resulting in work stagnation and affecting production progress.

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