CN200965634Y

CN200965634Y - An arc furnace controller

Info

Publication number: CN200965634Y
Application number: CNU2006201359489U
Authority: CN
Inventors: 姚建
Original assignee: XI'AN CHONGXIN ELECTRIC FURNACE EQUIPMENT CO Ltd
Current assignee: XI'AN CHONGXIN ELECTRIC FURNACE EQUIPMENT CO Ltd
Priority date: 2006-10-13
Filing date: 2006-10-13
Publication date: 2007-10-24
Anticipated expiration: 2016-10-13

Abstract

The utility model discloses a controlling device for an electric arc furnace, comprising three current transformers which are connected with a main circuit of a three-phase short net. The current transformer collects current signal to a three-phase current transmitter by a real-time voltmeter; three isolation transformers of the primary level are connected respectively with the real-time voltmeter and the three-phase short net and the three isolation transformers of the secondary level are connected with a three-phase voltage transmitter. The output ends of the three-phase current transmitter and the three-phase voltage transmitter are respectively connected with the input module of the current and voltage analog in the PLC programmable controller, and a regulator circuit is connected with the input module of the voltage analog in the PLC programmable controller while the output module in the PLC programmable controller is connected with the three inverters in the frequency conversion holder. The module with simple structure has the advantages of real-time operating, debugging the arc-furnace steelmaking easily with a wide regulating surface and a stationary arc striking in smelting, making the process of puncture, melting, oxidation and reduction all satisfy the technique requirements quickly, thereby improving the labor productivity and reaching the objectivity of consumption reduction.

Description

A kind of control device of electric arc furnaces

Technical field

The utility model belongs to electric arc furnaces control technology field, is specifically related to a kind of control device of electric arc furnaces

Background technology

Along with the continuous development of economic construction and national defense industry, require smelter that super quality and competitive price, meticulous excellent material are provided.Therefore smelter must constantly be innovated on process equipment, and adopt state-of-the-art technology realize its production run accurately, the purpose of efficient, volume increase and consumption reduction.

Adopt the casting department of electric arc furnace smelting to become the indispensable equipment of foundry goods unit such as large-scale ordnance factory, heavy-duty machine factory, shipyard, and this class unit electric arc furnaces control is aging often, equipment and technology is simple, all kinds of consumption are high especially: power consumption is through the degree more than eight or nine hundred even 1,000 of being everlasting, bell and lining durability are all on the low side, tracing it to its cause, mainly is that control system is unreasonable.

As everyone knows, smelter three big consuming cost are formed in raw materials consumption, human capital consumption and energy resource consumption, so adopt novel control technology, boost productivity to reduce every consumption indicators, and be the task of top priority.

Xi'an Zhongxin Electric Furnace Equipment Co., Ltd. is explored and research through long-term, develops a kind of novel control device finally.As everyone knows, the electric arc furnaces key of how to save energy and reduce the cost, how to raise labour productivity be how to control well electrode with furnace charge heat fused smelting process the trend of lifting.Here just draw " steel-making electric arc " notion.And the research of " steel-making electric arc " this phenomenon, the equipment that all neither one is direct, industrialized in the whole world, investment cost is few at present.Everybody controls flame current, arc voltage by indirect mode by the rise fall of electrodes regulating device, and then control " steel-making electric arc " and reach the purpose of steel-making.Actual is a kind of " fuzzy control ".So whether can control to optimum or curve and depend on that factor is with regard to it is enough.And general method is that numerous factors is ignored or weighting, only controls its curtage, so control is often inaccurate, energy consumption is than higher, even out of control.

The utility model content

The purpose of this utility model is to provide a kind of precise control at above-mentioned the deficiencies in the prior art, make electric-arc furnace steelmaking smelt the starting the arc simple, regulate face width, the control device of the electric arc furnaces of easily true-time operation, easy for installation and reliable operation.

For achieving the above object, the technical scheme that the utility model adopted is: a kind of control device of electric arc furnaces, it comprises with the short host of three-phase loop 3 wears empty three current transformer TA1, TA2 that are connected and TA3, current transformer TA1, TA2 and TA3 gather current signal and give three-phase current transmitter WB3I through three real-time current table PA1, PA2 and PA3, three-phase current transmitter WB3I output termination PLC Programmable Logic Controller current analog amount load module 5; Three isolating transformer BY1, the elementary real-time voltage table PV1 that is connected to respectively of BY2 and BY3, PV2 is connected with PV3 and with the short host of three-phase loop 3, it is secondary to be connected with three-phase voltage transmitter WB3V, three-phase voltage transmitter WB3V output termination PLC Programmable Logic Controller voltage analog load module 6, PLC Programmable Logic Controller analog output module 7 connects three frequency converters 4 in the frequency conversion tank, it is characterized in that: a WY12 volt direct supply is set on the switch board backboard, its full voltage is loaded on the full scale that is arranged in the rotational potentiometer 3K3 on the operator's console panel by tie, lead-out terminal is touched piece 6 by the voltage simulation volume input that tie connects the PLC Programmable Logic Controller in the middle of the rotational potentiometer 3K3, the rotational potentiometer 3K3 divider resistance R that connects.

The utility model compared with prior art has the following advantages: the utility model is simple in structure, the input expense is low especially, operation also is very easy to, by newly-increased this regulator loop, make that the electric-arc furnace steelmaking debugging is simple, regulate face width, the smelting starting the arc is steady, wear well, fusing, oxidation, reduction and can both make equipment satisfy the real low-priced requirement of technology very soon, and then raise labour productivity, reach to reduce and consume and the purpose of other expense.

Description of drawings

Fig. 1 is an electrical schematic diagram of the present utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is elaborated.

The control device of a kind of electric arc furnaces as shown in Figure 1, it comprises three current transformer TA1, TA2 and the TA3 that is connected with the short host of three-phase loop 3, three current transformer TA1, TA2 and TA3 gather current signal and give three-phase current transmitter WB3I through three real-time current table PA1, PA2 and PA3 respectively, three-phase current transmitter WB3I output termination PLC Programmable Logic Controller current analog amount load module 5; Elementary real-time voltage table PV1, the PV2 of being connected to respectively of three isolating transformer BY1, BY2 and BY3 is connected with PV3 and with the short host of three-phase loop 3, it is secondary to be connected with three-phase voltage transmitter WB3V, three-phase voltage transmitter WB3V output termination PLC Programmable Logic Controller voltage analog load module 6, PLC Programmable Logic Controller analog output module 7 connects three frequency converters 4 in the frequency conversion tank.On this basis, this device has increased a regulator loop newly, it is to increase a WY12 volt direct supply on the switch board backboard that this loop is formed, its full voltage is loaded on the full scale that is arranged in the rotational potentiometer 3K3 on the operator's console panel by tie, and then initiating terminal and middle lead-out terminal both end voltage by getting rotational potentiometer 3K3 full scale, deliver to the voltage simulation volume input of Mitsubishi PLC Programmable Logic Controller by tie and touch in the piece 6.Because the maximum input voltage of PLC requires to be 10V, so at the rotational potentiometer 3K3 divider resistance R that connects, the maximum voltage that makes rotational potentiometer 3K3 be input to the PLC Programmable Logic Controller is 10 volts.By regulating rotational potentiometer 3K3, the numeral that rotational potentiometer 3K3 is input to the PLC Programmable Logic Controller just changes between 0～2000, set in conjunction with current settings, voltage so, can easily find optimal match point efficiently according to the fluctuation of real-time current table PA1, PA2 and PA3 and real-time voltage table PV1, PV2 and PV3 again.And size and positive and negative three frequency converters 4 going control of conversion cabinet in of this input after by programming in the PLC Programmable Logic Controller, ratio, integration and amplification.

The rotating speed size and the direction of the cover torque motor-reductor of three in three frequency converters, the 4 controlling and driving mechanisms in the frequency conversion tank, motor-reductor is controlled displacement, speed and the direction that places three electrode 2 liftings on body of heater 1 interior steel scrap or the molten steel by the gear in the driving mechanism, rack member, and then the effect (effective conveying of electric current, voltage and power) of control melting.

The utility model electric arc furnace control device is the three-dimensional fuzzy control method of electric current, voltage and comprehensive parameters, the size that can regulate rotational potentiometer 3K3 according to each stage of smelting very flexibly, thereby adapt to or change speed, displacement and the direction of electrode 2 liftings, and then effective input of control energy and reach optimum efficiency.

Claims

1, a kind of control device of electric arc furnaces, it comprises with the short host loop of three-phase (3) wears empty three current transformer TA1, TA2 that are connected and TA3, current transformer TA1, TA2 and TA3 gather current signal and give three-phase current transmitter WB3I through three real-time current table PA1, PA2 and PA3, and three-phase current transmitter WB3I exports termination PLC Programmable Logic Controller current analog amount load module (5); Three isolating transformer BY1, the elementary real-time voltage table PV1 that is connected to respectively of BY2 and BY3, PV2 is connected with PV3 and with the short host loop of three-phase (3), it is secondary to be connected with three-phase voltage transmitter WB3V, three-phase voltage transmitter WB3V exports termination PLC Programmable Logic Controller voltage analog load module (6), PLC Programmable Logic Controller analog output module (7) connects three frequency converters (4) in the frequency conversion tank, it is characterized in that: a WY12 volt direct supply is set on the switch board backboard, its full voltage is loaded on the full scale that is arranged in the rotational potentiometer 3K3 on the operator's console panel by tie, lead-out terminal is touched piece (6) by the voltage simulation volume input that tie connects the PLC Programmable Logic Controller in the middle of the rotational potentiometer 3K3, the rotational potentiometer 3K3 divider resistance R that connects.