Automatic arcing device for vacuum consumable electric-arc furnace and control method

Abstract

The invention discloses an automatic arcing device for a vacuum consumable electric-arc furnace. A consumable electrode is arranged at the bottom of a furnace chamber; an auxiliary electrode is arranged above the consumable electrode; the upper end of the auxiliary electrode is connected with an electrode stem; the upper end of the electrode stem is connected with a transmission shaft; a differential mechanism/speed reducer is arranged at the upper end of the transmission shaft; the differential mechanism/speed reducer is connected with a feeding motor and a fast motor; a programmable controller comprises an output module, an input module, a CPU (Central Processing Unit) and a communication port; arc voltage measuring leads are respectively led out from the electrode stem and a housing of the furnace chamber; the other ends of the arc voltage measuring leads are connected with a signal transformer and then connected with the input module of the programmable controller; a voltage meter is connected with the signal transformer in parallel; a displacement sensor is also connected with the input module; and the output module and the input module are both connected with a motor controller. The invention further relates to a method for controlling arcing by using the arcing device; and the electrode stem is driven by the motor to strike an arc. The automatic arcing device for the vacuum consumable electric-arc furnace, disclosed by the invention, has the advantages of high arcing success rate, high arc distance control precision and high finished product ratio.

Description

technical field [0001] The invention belongs to the technical field of metal smelting equipment, and relates to an automatic arc starting device for a vacuum consumable electric arc furnace, and also relates to a method for controlling arc starting by using the arc starting device. Background technique [0002] The current vacuum consumable electrode electric arc furnace is in the initial stage of smelting and furnace welding: the coordination of the melting (welding) current output by the rectifier power supply and the movement of the consumable electrode is complicated, and the feed control of the electrode rod in the initial stage of smelting is very important to the arc. Distance determination and post-melt stability are important. Manual operation cannot give the current, electrode rod speed and moving direction in time, the success rate of one arc start and arc distance control accuracy are low, the time to enter stable melting is long and there are potential safety ha...

AI Technical Summary

Problems solved by technology

[0004] Another object of the present invention is to provide a control method for automatic arc starting of a vacuum consumable electric arc furnace, which solves the problems in the prior art, such as the low success rate of arc starting and the low accuracy of arc distance control, and the time to enter stable melting The problem of long and potential safety hazards improves the yield of finished products

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