CN2365623Y

CN2365623Y - Automatic regulator adapted to arc furnace current

Info

Publication number: CN2365623Y
Application number: CN 98232331
Authority: CN
Inventors: 乔天顺
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-12-29
Filing date: 1998-12-29
Publication date: 2000-02-23
Anticipated expiration: 2008-12-29

Abstract

The utility model relates to an automatic regulator adapted to arc furnace current, which comprises a sampling circuit, a comparator circuit, a reference signal circuit, an electrode lifting control circuit and an electrode descending control circuit. The utility model has the advantages that a puny current signal can be taken out from the current meter of an electric arc furnace through the sampling circuit; after the comparison by the reference signal set by the comparison circuit and the reference signal circuit, the temperature automatic regulation from a motor is controlled and executed through the electrode lifting control circuit and the electrode descending control circuit in the electric arc furnace body. Thus the goals of manual operating labour strength reduction and temperature control precision in the electric arc furnace body improvement can be realized.

Description

Be applicable to the self-checking device of electric arc furnaces electric current

The utility model relates to a kind of electric current self-checking device, relates to a kind of self-checking device that is applicable to the electric arc furnaces electric current specifically.

At present, electric arc furnaces that uses in the enterprise such as corundum stove, ferrosilicon stove, sulphur-furnace etc., its operation principle is that the electrode of opposed polarity is equipped with the body of heater that needs melted material every putting at a certain distance, pass to the current flow heats fusing, in the heat fused process, in order to satisfy the requirement of production technology, to regulate the heating-up temperature in the stove at any time continually, the adjusting of temperature is to realize by the degree of depth that the adjusting electrode stretches in the body of heater in the stove, when needs reduce temperature, promote electrode by motor, when the needs rising is measured, by motor decline electrode.And the lifting of electrode at present with drop to operation manually, this just causes operator's labour intensity big, and because manual operation, heating-up temperature also is difficult to accurately be controlled.

The purpose of this utility model just is to provide a kind of self-checking device that is applicable to the electric arc furnaces electric current of automatic adjusting heating current.

The purpose of this utility model can realize by following measure:

The utility model comprises that sample circuit, comparison circuit, reference signal circuit, electrode promote control circuit and electrode decline control circuit; Wherein the input of sample circuit is electrically connected with the coil of electric arc furnaces ammeter, and its output is electrically connected with comparison circuit by the center tap terminal of adjustable potentiometer W1; The reference signal circuit is made up of adjustable potentiometer W2, the positive 12 volts of power supplys of the last termination of this adjustable potentiometer W2, and lower end ground connection, its center tap terminal is electrically connected with comparison circuit; The output of comparison circuit promotes control circuit with electrode respectively and electrode decline control circuit is electrically connected.

In order in time to remind the operator, be connected to an electric current bound warning circuit at the output of comparison circuit.

Because the utility model takes out a small and weak current signal by sample circuit from the coil from the electric arc furnaces ammeter, after the reference signal of comparison circuit and the setting of reference signal circuit compares, control the automatic adjusting of actuating motor by electrode lifting control circuit and electrode decline control circuit to temperature in the electric arc furnaces body of heater, thereby realized reduction operator labour intensity, improved purpose temperature control precision in the electric arc furnaces body of heater.

The drawing of accompanying drawing is described as follows:

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is the functional-block diagram of Fig. 1.

Fig. 3 is a contour structures stereogram of the present utility model.

The utility model describes in further detail below with reference to embodiment (accompanying drawing):

As shown in the figure, the utility model comprises that sample circuit (I), comparison circuit (II), reference signal circuit (III), electrode promote control circuit (IV) and electrode decline control circuit (V); Sample circuit is electrically connected with the coil that electric arc protects ammeter by the primary side of transformer B1, its secondary end is electrically connected with voltage doubling rectifing circuit, is electrically connected with 5 pin of integrated circuit LM3914 in the comparison circuit (II) through the center tap terminal of the output adjustable potentiometer W1 of voltage doubling rectifing circuit; Reference signal circuit (III) is made up of adjustable potentiometer W2, the positive 12 volts of power supplys of the last termination of this adjustable potentiometer W2, and lower end ground connection, its center tap terminal is electrically connected with 6 pin of integrated circuit LM3914; 13 pin of integrated circuit LM3914 are electrically connected with the base stage of triode BG3 after diode D5, resistance R 6 series connection, the negative pole of light emitting diode D24 is electrically connected with 13 pin of integrated circuit LM3914, its positive pole is electrically connected with the emitter stage of triode BG3, is used to indicate the rising of electrode current; The colelctor electrode of triode BG3 is electrically connected with the end that the composition electrode promotes integrated circuit NE5554,8 pin and control relay J1 coil in the control circuit (IV), 3 pin of another termination integrated circuit NE555 of control relay J1 coil, the 1 pin ground connection of integrated circuit NE555; The normally opened contact J1a of control relay J1 is serially connected with in the circle circuit of auxiliary reclay J3, and the normally opened contact J3a of this auxiliary reclay J3 is serially connected with in the actuating motor prograde circuit; 17 pin of integrated circuit LM3914 are electrically connected with the base stage of triode BG4 after diode D2, resistance R 5 series connection, the negative pole of light emitting diode D20 is electrically connected with 17 pin of integrated circuit LM3914, its positive pole is electrically connected with the emitter stage of triode BG3, is used to indicate the reduction of electrode current; The colelctor electrode of triode BG4 is electrically connected with 4,8 pin of the integrated circuit NE555 that forms electrode decline control circuit (V) and an end of control relay J2 coil, 3 pin of another termination integrated circuit NE555 of control relay J2 coil, the 1 pin ground connection of integrated circuit NE555; The normally opened contact J2a of control relay J2 is serially connected with in the coil circuit of auxiliary reclay J4, and the normally opened contact J4a of this auxiliary reclay J4 is serially connected with in the actuating motor circuit for reversing.

In order when electrode current raises or reduce, to remind the operator to note, 10,18 pin of integrated circuit LM3914 in comparison circuit (II) are connected to an electric current bound warning circuit (VI) of being made up of triode BG2, integrated circuit NE555 by diode D1, D8 respectively, 4,8 pin of this integrated circuit NE555 are electrically connected with the colelctor electrode of triode BG2, its 3 pin connects an end of loudspeaker Y1 coil, the other end ground connection of loudspeaker Y1 coil by coupling capacitance C4.

Operation principle of the present utility model is as follows:

When the temperature in the electric arc furnaces surpasses predetermined temperature, the coil current of electric arc furnaces ammeter increases, the primary current of transformer B1 increases, the secondary current that causes transformer B1 increases, make the center tap terminal of adjustable potentiometer W1 export to the 5 pin current potentials rising of integrated circuit LM3914 in the comparison circuit (II), surpass the reference signal circuit of forming by adjustable potentiometer W2 (III) and export to the current potential of 6 pin of integrated circuit LM3914 in the comparison circuit (II) by the center tap terminal of adjustable potentiometer W2, the 13 pin current potentials of integrated circuit LM3914 reduce in comparison circuit this moment (II), diode D5 conducting, cause triode BG3 saturation conduction, at this moment, 1 of the integrated circuit NE555 of electrode lifting control circuit (IV), 3 pin conductings, control relay J1 coil electricity, its normally opened contact J1a closure, because normally opened contact J1a is serially connected with in the circle circuit of auxiliary reclay J3, make this auxiliary reclay J3 coil electricity, be serially connected with the normally opened contact J3a closure in the actuating motor prograde circuit, actuating motor is just changeing mentions electrode, electrode current reduces, temperature in the electric arc furnaces descends, and the coil current of electric arc furnaces ammeter also reduces thereupon simultaneously.When the temperature in the electric arc furnaces drops to predetermined temperature, this moment, the center tap terminal 5 pin current potentials of exporting to integrated circuit LM3914 in the comparison circuit (II) of adjustable potentiometer W1 equated with the current potential of 6 pin of being exported to the middle integrated circuit LM3914 of comparison circuit (II) by the center tap terminal of adjustable potentiometer W2, the 13 pin current potentials of integrated circuit LM3914 raise in the comparison circuit (II), diode D5 ends, and the actuating motor outage stops operating.

When the temperature in the electric arc furnaces is lower than predetermined temperature, the coil current of electric arc furnaces ammeter reduces, the primary current of transformer B1 reduces, the secondary current that causes transformer B1 reduces, make the center tap terminal of adjustable potentiometer W1 export to the 5 pin current potentials decline of integrated circuit LM3914 in the comparison circuit (II), be lower than the reference signal circuit of forming by adjustable potentiometer W2 (III) and export to the current potential of 6 pin of integrated circuit LM3914 in the comparison circuit (II) by the center tap terminal of adjustable potentiometer W2, the 17 pin current potentials of integrated circuit LM3914 reduce in comparison circuit this moment (II), diode D2 conducting, cause triode BG4 saturation conduction, at this moment, 1 of integrated circuit NE555 in the electrode decline control circuit (V), 3 pin conductings, control relay J2 coil electricity, its normally opened contact J2a closure, because normally opened contact J2a is serially connected with in the circle circuit of auxiliary reclay J4, make this auxiliary reclay J4 coil electricity, be serially connected with the normally opened contact J4a closure in the actuating motor circuit for reversing, the actuating motor counter-rotating descends electrode, electrode current increases, temperature in the electric arc furnaces raises, the coil current of electric arc furnaces ammeter also increases thereupon simultaneously, when the temperature in the electric arc furnaces is increased to predetermined temperature, this moment, the center tap terminal 5 pin current potentials of exporting to integrated circuit LM3914 in the comparison circuit (II) of adjustable potentiometer W1 equated with the current potential of being exported to 6 pin of integrated circuit LM3914 in the comparison circuit by the center tap terminal of adjustable potentiometer W2, the 17 pin current potentials of integrated circuit LM3914 raise in the comparison circuit (II), diode D2 ends, and the actuating motor outage stops operating.

Claims

1, a kind of self-checking device that is applicable to the electric arc furnaces electric current is characterized in that: it comprises that sample circuit (I), comparison circuit (II), reference signal circuit (III), electrode promote control circuit (IV) and electrode decline control circuit (V); Wherein the input of sample circuit (I) is electrically connected with the coil of electric arc furnaces ammeter, and its output is electrically connected with comparison circuit (II) by the center tap terminal of adjustable potentiometer W1; Reference signal circuit (III) is made up of adjustable potentiometer W2, the positive 12 volts of power supplys of the last termination of this adjustable potentiometer W2, and lower end ground connection, its center tap terminal is electrically connected with comparison circuit (II); The output of comparison circuit (II) promotes control circuit (IV) with electrode respectively and electrode decline control circuit (V) is electrically connected.

2, the self-checking device that is applicable to the electric arc furnaces electric current according to claim 1 is characterized in that: the output of comparison circuit (II) is electrically connected with the input of electric current bound warning circuit (VI).