A safety interlocking device and control method for electrode connection platform of lf refining furnace

Abstract

The invention relates to a safety interlocking device and a control method for an electrode-connected platform of an LF refining furnace, and belongs to the technical field of refining equipment outside the LF furnace. Technical solution: Under the condition that the operator does not cut off the power of the three-phase electrodes, the computer disconnects the power switch through the electrode PLC control cabinet, the three-phase electrodes are powered off, and the green indicator light is on at the same time; when the operator leaves after operating the electrodes, At an interval of 15 seconds, after the operator reaches a safe position, the three-phase electrodes are energized, and the red light of the indicator light is on at the same time. The device structure of the present invention is reasonable, and the control method is simple and practical. When the operator forgets to disconnect the high-voltage switch and enters the electrode platform, after opening the safety isolation door, the power-off interlock device will be triggered, and the high-voltage switch will be automatically disconnected, effectively avoiding the electrode from being disconnected. Arc causes personal and equipment accidents.

Description

technical field [0001] The invention relates to a safety interlocking device and a control method for an electrode-connected platform of an LF refining furnace, and belongs to the technical field of refining equipment outside the LF furnace. Background technique [0002] The LF furnace is an out-of-furnace refining method with arc heating as the main technical feature. It uses graphite electrodes for heating. During the heating process, the electrodes will be melted and damaged. After the electrodes become shorter, the heating operation will be affected, so the electrodes will be connected during the production process. The platform performs multiple electrode connection or sliding electrode operations to meet production needs. The current of the LF furnace is 25-50KA, the voltage is 160-280V, and the arc plasma generated can reach an ultra-high temperature of 5000-20000°C. If the operator forgets to turn off the high-voltage switch during connecting and sliding electrodes ...

AI Technical Summary

Problems solved by technology

If the operator forgets to turn off the high-voltage switch during the process of connecting and sliding electrodes and enters the electrode connecting platform for operation, it will cause the electrodes to arc and cause personal and equipment accidents, which will pose a major safety hazard. Similar accidents have occurred in some iron and steel enterprises.

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