Electric arc furnace three-phase electrode liquid level insertion depth measuring device

Abstract

The utility model belongs to the technical field of electric arc furnace smelting, and particularly relates to an electric arc furnace three-phase electrode liquid level insertion depth measuring device which is characterized in that an electrode arm is arranged above each electrode, and a pull rope sensor is arranged under each electrode arm; the pull rope sensor is fixedly arranged on the upper surface of an arc-shaped base of the electric arc furnace, the movable end of the pull rope sensor is vertically connected with the corresponding electrode arm, and the pull rope sensor is electrically connected with the PLC. The pull rope sensor is arranged, the movable end of the pull rope sensor can be scaled along with ascending and descending of the electrode, then the ascending and descending height of the electrode is measured, the current of the electrode is zero when the electrode is not inserted into the liquid level, the current of the electrode is changed after the electrode is inserted into the liquid level, and the ascending and descending height of the electrode is measured by recording data of the pull rope sensor when the current is changed. And after the electrode stops ascending and descending, calculating the difference between the two data of the pull rope sensor to obtain the depth of the electrode inserted into the liquid level.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric arc furnace smelting, and in particular relates to a device for measuring the insertion depth of a three-phase electrode liquid surface of an electric arc furnace. Background Art

[0002] The electric arc furnace is one of the main smelting devices in industrial production. The electric arc furnace mainly includes an arc-shaped base and a furnace body arranged on the arc-shaped base. The working mechanism of the electric arc furnace is to use three electrodes with three-phase alternating current, namely A, B, and C phases. Among the three electrodes, one is located in the center of the furnace body, and the other two are symmetrically arranged on both sides of the middle electrode, which penetrate into the furnace body to form an arc discharge, gradually melt the material, and continuously discharge in the furnace body to generate a continuous current, which is used to heat and smelt the material in the furnace, or to provide energy for chemical reactions under high temperature conditions. The three-phase electrodes discharge in the molten pool, inject energy, and complete the smelting process;

[0003] The electric arc furnace usually has electrodes and an electrode lifting mechanism, and uses a special motor to drive the electrodes to rise and fall. If the three-phase electrode is inserted too shallowly into the liquid surface, it will cause slow heating, wasting time and electricity. If it is inserted too deep into the liquid surface, it will cause carbon addition to the alloy. Therefore, it is necessary to measure the depth of the three-phase electrode inserted into the liquid surface;

[0004] In the existing technology, workers mainly rely on visual inspection and rough estimation based on experience, which cannot achieve accurate measurement of electrode depth. At the same time, since the angle of the arc furnace changes in real time, in order to accurately control the insertion depth of the arc furnace electrode, it is also necessary to accurately measure the tilting angle of the arc furnace, which brings greater challenges to the accurate measurement of the electrode depth. Utility Model Content

[0005] In view of the above problems, the utility model provides a device for measuring the insertion depth of three-phase electrode liquid level of an electric arc furnace.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A device for measuring the liquid level insertion depth of three-phase electrodes in an electric arc furnace, wherein an electrode arm is arranged above each electrode, and a pull-wire sensor is arranged directly below each electrode arm. The pull-wire sensor is fixedly arranged on the upper surface of the arc-shaped base of the electric arc furnace, and the movable end of the pull-wire sensor is vertically connected to the corresponding electrode arm. The pull-wire sensor is electrically connected to a PLC controller.

[0008] Furthermore, an angle measuring mechanism is provided on the side of the arc base for measuring the deflection angle of the arc furnace. The angle measuring mechanism is electrically connected to the PLC controller to measure the depth of the electrode inserted into the liquid surface after the arc furnace is deflected.

[0009] Furthermore, the angle measuring mechanism includes a bracket fixedly connected to the arc base, an encoder is fixedly arranged on the bracket, the encoder is connected to a connecting rod through a coupling, a weight is fixedly arranged at the lower end of the connecting rod, the center of gravity of the weight is located on the extension line of the axis of the connecting rod, and the encoder is electrically connected to the PLC controller.

[0010] Furthermore, the encoder is an absolute value encoder.

[0011] Compared with the prior art, the utility model has the following advantages:

[0012] The utility model is provided with a drawstring sensor, the movable end of which can be scaled along with the lifting and lowering of the electrode, thereby realizing the measurement of the lifting height of the electrode. When the electrode is not inserted into the liquid surface, the current on the electrode is 0, and after the electrode is inserted into the liquid surface, the current of the electrode will change. By recording the data of the drawstring sensor when the current changes, and the data of the drawstring sensor after the electrode stops lifting and lowering, the difference between the two is calculated to obtain the depth of the electrode inserted into the liquid surface;

[0013] The utility model is provided with an angle measuring mechanism for measuring the angle of the electric arc furnace. Combined with the data of the pull rope sensor, the depth of the electrode inserted into the liquid surface can be measured in real time without being affected by the inclination angle of the electric arc furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the front view of the utility model;

[0015] Figure 2 It is a side view of the utility model;

[0016] Figure 3 It is a signal module diagram of the utility model;

[0017] Figure 4 This is a structural schematic diagram of the angle measuring mechanism of the utility model;

[0018] In the figure, electrode-1, electrode arm-2, pull rope sensor-3, arc base-4, PLC controller-5, angle measuring mechanism-6, furnace body-7, bracket-601, encoder-602, connecting rod-603, and heavy hammer-604. DETAILED DESCRIPTION

[0019] In order to further illustrate the technical solution of the present invention, the present invention is further described below through embodiments.

[0020] like Figures 1 to 4As shown, a device for measuring the insertion depth of a three-phase electrode liquid level in an electric arc furnace is provided. An electrode arm 2 is provided above each electrode 1, and a pull-wire sensor 3 is provided directly below each electrode arm 2. The pull-wire sensor 3 is fixedly provided on the upper surface of an arc-shaped base 4 of the electric arc furnace. The movable end of the pull-wire sensor 3 is vertically connected to the corresponding electrode arm 2, and the pull-wire sensor 3 is electrically connected to a PLC controller 5. An angle measuring mechanism 6 is provided on the side of the arc-shaped base 4 for measuring the deflection angle of the electric arc furnace. The angle measuring mechanism 6 is electrically connected to the PLC controller 5 to facilitate measurement of the depth of the electrode inserted into the liquid level after the electric arc furnace is deflected.

[0021] The angle measuring mechanism 6 includes a bracket 601 fixedly connected to the arc base 4, an encoder 602 is fixedly arranged on the bracket 601, the encoder 602 is connected to a connecting rod 603 through a coupling, a weight 604 is fixedly arranged at the lower end of the connecting rod 603, the center of gravity of the weight 604 is located on the extension line of the axis of the connecting rod 603, and the encoder 602 is electrically connected to the PLC controller 5.

[0022] In the above embodiment, the encoder 602 is an absolute value encoder.

[0023] Angle measurement method: record the value of encoder 602 when furnace body 7 is in horizontal state in PLC controller 5. When furnace body 7 tilts, encoder 602 rotates with furnace body 7, while weight 604 always points downward under the action of gravity, and drives input shaft of encoder 602 to rotate through coupling. The rotation amount is transmitted to PLC controller 5, and the deflection angle value of furnace body 7 is obtained through calculation of PLC controller 5.

[0024] Depth measurement method: When the angle of the electric arc furnace changes, since the middle electrode 1 is located in the middle of the electric arc furnace, the liquid level height at its location is almost unchanged, so the insertion depth of the middle electrode 1 can be measured only by the draw wire sensor 3. The following is a detailed description of the calculation method of the liquid surface insertion depth of the edge side electrode 1: When the electrode 1 is above the liquid surface, the current of the electrode 1 is 0. When the electrode 1 is inserted from above the liquid surface to the liquid surface, if the current of the electrode 1 is greater than 2, the PLC controller 5 records the corresponding position h1 of the draw wire sensor 3 and the angle θ1 of the furnace body 7 of the electrode 1 at this time. When the position of the electrode 1 and the angle of the furnace body 7 are changed, the PLC controller 5 records the corresponding position h2 of the draw wire sensor 3 and the angle θ2 of the furnace body 7 of the electrode 1 at this time. The insertion depth of the electrode 1 is calculated as: [h2-h1+r(tanθ2-tanθ1)]cosθ2. Where r is the horizontal distance from the center line of the edge side electrode 1 to the center line of the furnace body 7.

[0025] The above shows and describes the main features and advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, and it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the utility model.

[0026] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for measuring the liquid level insertion depth of a three-phase electrode in an electric arc furnace, wherein an electrode arm (2) is arranged above each electrode (1), and wherein: A pull-wire sensor (3) is arranged directly below each electrode arm (2); the pull-wire sensor (3) is fixedly arranged on the upper surface of the arc-shaped base (4) of the electric arc furnace; the movable end of the pull-wire sensor (3) is vertically connected to the corresponding electrode arm (2); and the pull-wire sensor (3) is electrically connected to the PLC controller (5).

2. The device for measuring the liquid level insertion depth of a three-phase electrode in an electric arc furnace according to claim 1, characterized in that: An angle measuring mechanism (6) is provided on the side of the arc-shaped base (4) for measuring the deflection angle of the electric arc furnace. The angle measuring mechanism (6) is electrically connected to the PLC controller (5) so as to measure the depth of the electrode inserted into the liquid surface after the electric arc furnace is deflected.

3. The device for measuring the liquid level insertion depth of a three-phase electrode of an electric arc furnace according to claim 2, characterized in that: The angle measuring mechanism (6) comprises a bracket (601) fixedly connected to the arc base (4), an encoder (602) is fixedly arranged on the bracket (601), the encoder (602) is connected to a connecting rod (603) via a coupling, a weight (604) is fixedly arranged at the lower end of the connecting rod (603), the center of gravity of the weight (604) is located on the extension line of the axis of the connecting rod (603), and the encoder (602) is electrically connected to the PLC controller (5).

4. The device for measuring the liquid level insertion depth of three-phase electrodes in an electric arc furnace according to claim 3, characterized in that: The encoder (602) is an absolute value encoder.

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