Method for testing molten drops of vacuum consumable electrode arc furnace based on saturable reactor stabilized current supply
A technology of vacuum self-consumption arc and steady-current power supply, which is applied in the direction of pulse characteristic measurement, frequency measurement device, lighting and heating equipment, etc., which can solve the problems of high import price and non-sale, and achieve quality assurance, clearance guarantee and guarantee compactness effect
Inactive Publication Date: 2014-06-18
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
However, the key technologies of the droplet test and control system under the saturable reactor are still monopolized by large foreign companies, and the import price is very expensive, and there are basically no separate droplet test equipment modules for sale.
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specific Embodiment
[0022] Specific embodiment: adopt the vacuum self-consumption electric arc furnace of 3t to smelt tungsten-manganese alloy steel, the furnace pressure reference value is 24V, according to the present invention, its step process is as follows:
[0023] Step 1: Transform the furnace pressure signal output by the saturable reactor constant current power supply at 10:1, then send it to the DSP processor for high-speed sampling at a frequency of 50KHz, and store the digital signal after sampling conversion into the ping-pong buffer In the zone, each zone has a size of 25K and stores half a second of data.
[0024] Step 2: While sampling, process the data in the ping-pong buffer in real time. Take the half-second data in the ping-pong buffer as a group, and compare the sampled data with the set threshold one by one. The threshold here is half of the transformed furnace pressure signal reference voltage value, which is 1.2V, such as sampling conversion If the value is greater than 1...
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The invention relates to a method for testing molten drops of a vacuum consumable electrode arc furnace based on a saturable reactor stabilized current supply. The method is characterized in that the saturable reactor stabilized current supply is used as a power supply of the vacuum consumable electrode arc furnace. The method comprises the following steps of: performing voltage transformation processing on a furnace pressure signal of the vacuum consumable electrode arc furnace, and then performing sampling at a frequency of not lower than 50kHz by using a digital signal processor (DSP) to obtain sampled data; and comparing the sampled data with a set threshold value one by one to obtain the number of continuous sampling transformed values which are smaller than the threshold value and are contained in molten drop short circuit pulses, dividing the number by a sampling rate to obtain the duration of the molten drop short circuit pulses, and outputting the duration to a control equipment programmable logic controller (PLC) through a serial port. The method has the advantages that the change of arc length is detected exquisitely in time, accurate test data are provided for subsequent molten drop control, and the compactness of high-temperature alloy melting is ensured.
Description
technical field [0001] The invention relates to a method for testing molten droplets in a vacuum consumable electric arc furnace based on a saturated reactor steady-current power supply, and relates to a vacuum consumable electric arc furnace using molten droplet short circuit in different frequency ranges under the saturated reactor steady-current power supply The method of controlling the melting of special steel and superalloy metal by using the number of pulses. 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, ...
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IPC IPC(8): G01R29/02G01R23/02F27B3/28
Inventor 吕国云胡水仙樊养余齐敏
Owner NORTHWESTERN POLYTECHNICAL UNIV