Vacuum self-electricity-consumption arc furnace molten drop test method based on a silicon-controlled power supply

Abstract

The invention relates to a vacuum self-electricity-consumption arc furnace molten drop test method based on a silicon-controlled power supply. The method is characterized by utilizing a silicon-controlled power supply as a power supplying power supply of a vacuum self-electricity-consumption arc furnace, and comprising the following test steps: performing voltage variation treatment on a furnace voltage signal of the vacuum self-electricity-consumption arc furnace, and then sampling at a frequency no less than 50KHz by virtue of a DSP (digital signal processor), thus obtaining sampling data; performing multi-level trapped wave treatment on sampling conversion data, and comparing the trapped wave treatment data with the set threshold one by one, thus obtaining the time of duration of a molten drop short-circuit pulse which is included in the molten drop short-circuit pulse, is continuously less than the threshold and is obtained by dividing the sampling rate by the number of sampling variation value; and outputting the sampling conversion data to a control device PLC (programmable logic controller) through a serial port. The vacuum self-electricity-consumption arc furnace molten drop test method based on the silicon-controlled power supply has the beneficial effects that the variation of the arc length is detected timely and keenly, accurate test data is provided for the subsequent molten drop control, and the compactness of high-temperature alloy smelting is ensured.

Description

technical field [0001] The invention relates to a method for testing molten drops in a vacuum consumable electric arc furnace based on a thyristor power supply, and is especially suitable for a remelting process in which the linear slope of voltage and arc length is not very obvious. Background technique [0002] In order to ensure the quality of metal smelting, the vacuum consumable electric arc furnace must have a very stable and reliable automatic control system. Among them, arc length fluctuation is the main cause of segregation and inspection failure, so the control of arc length is particularly important. At present, most domestic melting projects are controlled by arc voltage combined with constant melting rate. This control method is relatively simple and easy to implement. However, many special steels, high-temperature alloys, and rare metal alloys are not sensitive to arc voltage, but to the number of molten droplets. more sensitive. However, the current mature d...

AI Technical Summary

Problems solved by technology

However, the key technology of the droplet test and control system based on the saturable reactor constant current power supply is still monopolized by large foreign companies, and the import price is very expensive, and there is basically no separate droplet test equipment for sale.

As for the droplet measurement and control based on the silicon controlled rectifier power supply, no similar technology has been found in foreign countries, and the saturated reactor power supply is generally used to implement the droplet measurement and control.

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