Airtight negative pressure electric arc smelting furnace

Abstract

The invention relates to an airtight negative pressure electric arc smelting furnace which comprises electrode frames (3), electrodes (5), a smoke gas cover (4), a furnace body (8) and a base station (2). The airtight negative pressure electric arc smelting furnace is characterized in that a lifting table (9) which is used for containing the furnace body (8) is arranged below the base station (2); the smoke gas cover (4) is formed by enclosing a surrounding cover wall (11) and a cover cap (12) at the upper end of the smoke gas cover (4), the cover wall (11) is provided with grooves (13) concave towards the inner side of the cover wall (11), the number of the grooves (13) is the same as that of the electrodes (5), each groove (13) is formed by enclosing two opposite groove walls and an inner side groove wall and a lower end plate (20), and electrode sockets (6) which make the electrodes come in and come out are formed in the lower end plates (20), the lower ends of uprights (21) of the electrode frames (3) are connected with the base station (2) through transverse shafts (24), and one side of each upright (21) is provided with a pulling mechanism. The airtight negative pressure electric arc smelting furnace has the advantages that the airtight performance of a furnace mouth and the smoke gas cover can be significantly enhanced, the heat loss can be reduced, the environmental pollution is avoided, and the working condition is improved. The electrodes can adjust the angle of inclination through being driven by the uprights, and the electrodes are sensitive in action and sturdy and durable. The temperature in the furnace is even, the heat efficiency is high, the negative pressure smelting atmosphere is formed, and the smelting quality is greatly improved.

Description

technical field [0001] The invention relates to a smelting equipment, namely a closed negative-pressure electric arc smelting furnace suitable for smelting boron carbide and other non-metallic ores or metal alloys. Background technique [0002] Electric arc furnace is a device that uses electric arc to generate high temperature for melting. The existing electric arc furnace has more than one abutment, and a plurality of electrode racks are installed on the abutment, and rod-shaped electrodes are installed on the electrode racks, and a passage is provided under the abutment, and the furnace body of the electric arc furnace can move along the passage. During operation, the electrode is inserted into the furnace body to generate an arc, which releases high-temperature energy and melts the raw material. After one furnace is melted, the electrode is pulled out, the furnace body is removed, and then the next furnace body is melted. The electric arc furnace occupies a small area,...

AI Technical Summary

Problems solved by technology

During smelting, part of the heat and smoke will be discharged to the periphery of the furnace body through the gap between the furnace body and the abutment, which will increase the temperature of the periphery of the furnace body and reduce the air quality, resulting in heat loss and damage to the health of the workers.

[0004] 2. The height of the fume hood is not enough and the airtightness is not tight

However, in addition to the smoke exhaust port, the inlet of the electrode should be opened on the fume hood, and the inlet of the electrode should not be too high, otherwise it will hinder the movement of the electrode

The height of the flue gas hood is low, and its upper cover is in a high-temperature zone, making it more difficult to recover heat, and the smoke and heat discharged from each opening will increase, directly destroying the working environment around the furnace body

In addition, the fume hood also needs to have a feeding port and a feeding pipe. The high temperature causes the raw materials to melt in advance during the fall, causing the feeding pipe to be stuck and blocked, requiring frequent cleaning and replacement, or even canceling the feeding pipe. Long-distance feeding increases the demand for space and increases operating costs

[0005] 3. It is difficult to adjust the distance between electrodes

On the contrary, some electric arc furnaces have relatively large pole centers, and there will be a phenomenon of poor intermediate reactions.

In order to solve this problem, some people try to change the angle of the electrode by changing the angle of the electrode clamping sleeve, but because the electrode is relatively heavy, the adjustment is laborious, the related parts are easily damaged, the failure rate is high, the adjustable range is small, and the adjustment sensitivity is low. Unsatisfactory effect

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