A method of adjusting the electrode cross arm core circle in a mold as a reference line

Abstract

A method for adjusting the center circle of the electrode cross arm using a mold centering point as a reference line belongs to the technical field of electrode cross arm adjustment for electric arc furnace equipment. First, a mold with the same diameter as the electrode is made. Then, the center of the mold is determined based on the mold centering point. A plumb line is passed through the center, and the mold is fixed to the motor cross arm holding mechanism; the center of the plumb line is the center of the electrode. Finally, the center circle is adjusted using three plumb lines as reference points. This method of using the mold centering point as a reference point solves the problem of difficult positioning of the electrode cross arm center circle in electric arc furnaces. The advantages are that the electrode cross arm center circle is easy to position, the center point is accurate, and the technical quality requirements are met.

Description

[0001] This invention belongs to the field of electric furnace equipment electrode cross arm adjustment technology, and in particular provides a method for adjusting the electrode cross arm center circle using the mold centering as a reference line, which is applicable to the adjustment of electric furnace equipment electrode cross arms and LF ladle refining electrode cross arms. Background Technology

[0002] We undertook the steelmaking and lime kiln installation engineering for the Tosyali Phase IV integrated steel plant project in Algeria. During the installation of the electric arc furnace equipment, the electrode crossarm center circle is of paramount importance in the adjustment of the furnace equipment. The theoretical arrangement of the three-phase electric arc furnace's centers is an equilateral triangle. The circumcircle of the triangle passing through the centers of the three electrodes is called the electrode center circle, which is one of the most important parameters of the smelting furnace.

[0003] The electrode arrangement must be as close as possible to an equilateral triangle to obtain good and stable current conditions and maximize energy utilization. A misalignment between the coaxiality of the three-phase electrode centers and the furnace shell center will cause the heat source center to deviate, resulting in uneven heating of the furnace charge. Therefore, the installation and maintenance of three-phase AC power systems require rigorous testing and adjustment of these data.

[0004] The positioning of the electrode center is crucial for the electrode center circle, serving as the reference point for its adjustment. However, the electrode holder is hollow, and its inner diameter, under the action of the spring, is smaller than the electrode diameter in the direction parallel to the electrode's transverse arm. Therefore, the cross-shaped method cannot be used to find the center; multiple measurements are usually required to calibrate the electrode center position. The electrode center is difficult to determine, and the electrode holder relies on water cooling, making it strictly forbidden to weld wire frames onto it.

[0005] In summary, locating the center of the cross arm of the electric arc furnace electrode is difficult. Summary of the Invention

[0006] The purpose of this invention is to provide a method for adjusting the center circle of the electrode cross arm as a reference line in mold centering, which solves the problem of difficult electrode center positioning.

[0007] The technical solution adopted in this application is as follows:

[0008] First, a mold with the same diameter as the electrode needs to be made. Then, the center of the mold is determined based on the mold's centering. A plumb line is passed through the center, and the mold is fixed to the motor's cross arm holding mechanism. The center of the plumb line is the center of the electrode. Finally, using the three plumb lines as reference points, the electrode center circle is adjusted. This method of using the mold centering as a reference point solves the problem of difficult positioning of the electrode center circle on the electric arc furnace's cross arm. The specific steps are as follows:

[0009] (1) Prepare the packaging material for the electrode, encapsulate the foam board, and make foam mold 1 with the same outer diameter as the electrode diameter;

[0010] (2) Draw two longest straight lines on the foam board mold 1. The intersection of the two straight lines is the center of the mold. Then mark the center, drill a hole at the center, and fix the plumb line 5 through the center.

[0011] (3) Place the foam mold 1 on the fixed end 6 of the electrode holding mechanism, start the movable end 7 of the electrode holding mechanism, so that the movable end 7 and the fixed end 6 of the electrode holding mechanism simultaneously hold the foam mold 1. The foam mold 1 should be placed horizontally. Use the tubular level 4 to check the levelness in two directions. If there is a deviation in the level, place a feeler gauge under the tubular level 4 and make a mark on the fixed end 6 of the electrode holding mechanism. Turn off the movable end 7 of the motor holding mechanism, and the movable end 7 of the electrode holding mechanism will retract. Replace the foam mold 1 so that the position matches the mark. Restart the movable end 7 of the electrode holding mechanism to hold the foam mold 1.

[0012] (4) Adjust the center circle of electrode arm 8 with plumb bob 5 as the reference point.

[0013] When hydraulics is not available, a steel plate mold 9 is made using a steel plate. A steel plate with the same diameter as the electrode and a thickness t = 10 mm is cut. The center of the steel plate mold 9 is found by finding the intersection of two longest straight lines, and a hole is drilled at the center. An M16 nut 2 is welded to the steel plate mold 9, close to the movable end 7 of the electrode holding mechanism. The steel plate mold 9 is fixed to the holding mechanism using an M16*150 mm hex bolt 3. A tubular level 4 is used to measure the horizontal and vertical levelness of the steel plate mold 9. A plumb line 5 is fixed at the center of the steel plate mold 9. The plumb line 4 is used as a reference line to adjust the center circle of the electrode horizontal arm 8.

[0014] Optionally, the hydraulic system of the electrode crossarm clamping mechanism has been put into use, and the foam board of the electrode packaging material can be used as a mold on site. The diameter of the foam board is the same as that of the electrode.

[0015] Optionally, if the hydraulic system of the electrode crossarm clamping mechanism is not in use, a circular steel plate with the same diameter as the electrode can be cut as a mold.

[0016] The advantages of this invention are that it facilitates easy positioning of the electrode cross arm's center circle, ensuring precise center point alignment and meeting technical quality requirements. It is applicable to the adjustment of electrode cross arms in electric furnace equipment, and also to the adjustment of electrode cross arms in LF ladle refining. Attached Figure Description

[0017] This figure is a simplified schematic diagram of an invention for solving the problem of positioning the center of the eight poles of the horizontal arm of an electric arc furnace electrode.

[0018] Figure 1 This is a schematic diagram of the elevation of a foam mold with a split-center method.

[0019] Figure 2 This is a schematic diagram of the foam mold centering method.

[0020] Figure 3 This is a schematic diagram of the elevation of the steel plate mold splitting method.

[0021] Figure 4 This is a schematic diagram of the centering method for steel plate molds.

[0022] In the diagram: 1. Foam mold (electrode packaging foam board); 2. M16 nut; 3. M16*150 mm hex bolt; 4. Tubular level; 5. Plumb bob; 6. Fixed end of electrode clamping mechanism; 7. Movable end of electrode clamping mechanism; 8. Electrode cross arm; 9. Steel plate mold (t=10 mm steel plate). Detailed Implementation

[0023] The invention will now be further described with reference to the accompanying drawings.

[0024] Specific operating method:

[0025] Example 1

[0026] 1. Prepare the packaging material for the electrodes, using foam boards with the same outer diameter as the electrodes.

[0027] 2. Then draw the two longest straight lines on the foam mold 1. The intersection of the two lines is the center of the mold. Mark the center, drill a hole at the center, and fix the plumb line 5 through the center.

[0028] 3. Place the foam mold 1 on the fixed end 6 of the electrode holding mechanism. Slowly start the movable end 7 of the electrode holding mechanism so that both the movable end 7 and the fixed end 6 simultaneously hold the foam mold 1. The foam mold 1 should be placed horizontally. Use a tubular level 4 to check the levelness in two directions. If there is a deviation in levelness, place a feeler gauge under the tubular level 4 and mark it on the fixed end 6 of the holding mechanism. Close the movable end 7 of the holding mechanism, and the movable end 7 of the electrode holding mechanism will retract. Reposition the foam mold 1 so that its position matches the marked position, and restart the movable end 7 of the electrode holding mechanism to hold the foam mold 1.

[0029] 4. Finally, adjust the center circle of electrode arm 8 with plumb bob 4 as the reference point.

[0030] Example 2

[0031] 1. When hydraulic pressure is not feasible, use steel plates to make a mold. 9. Cut a steel plate with the same diameter as the electrode.

[0032] 2. Then draw the two longest straight lines on the steel plate mold. The intersection of the two lines is the center of the mold. Mark the center, drill a hole at the center, and fix the plumb line through the center.

[0033] 3. Weld an M16 nut 2 to the side of the mold near the movable end 7 of the electrode holding mechanism, and then install an M16*150 lead screw 3. One end of the lead screw 3 presses against the movable end 7 of the holding mechanism. Through the force of the lead screw 3, the steel plate mold 9 is fixed on the fixed end 6 of the clamping mechanism. The steel plate mold 9 should be placed horizontally. Use a level 4 to check the level in two directions. If there is a deviation in the level, gently tap it with a hammer to adjust it.

[0034] 4. Finally, adjust the center circle of the electrode arm using the plumb bob 4 as the reference point.

Claims

1. A method for adjusting the center circle of the electrode cross arm using mold centering as a reference line, characterized in that: The specific steps are as follows: 1) Prepare the packaging material for the electrode, encapsulate the foam board, and make a foam mold (1) with the same outer diameter as the electrode diameter; 2) Draw the two longest straight lines on the foam mold (1). The intersection of the two straight lines is the center of the mold. Then mark the center and drill a hole at the center. The plumb line (5) passes through the center and is fixed. 3) Place the foam mold (1) on the fixed end (6) of the electrode holding mechanism, start the movable end (7) of the electrode holding mechanism, so that the movable end (7) and the fixed end (6) of the electrode holding mechanism simultaneously hold the foam mold (1). The foam mold (1) should be placed horizontally. Use a tubular level (4) to check the levelness in two directions. If there is a deviation in the level, place a feeler gauge under the tubular level (4) and make a mark on the fixed end (6) of the electrode holding mechanism. Close the movable end (7) of the motor holding mechanism, and the movable end (7) of the electrode holding mechanism will retract. Replace the foam mold (1) so that the position matches the mark. Restart the movable end (7) of the electrode holding mechanism to hold the foam mold (1). 4) Adjust the center circle of the electrode arm (8) with the plumb bob (5) as the reference point.

2. The method for adjusting the center circle of the electrode cross arm as a reference line in mold centering according to claim 1, characterized in that: When hydraulics is not available, a steel plate mold (9) is made using a steel plate. A steel plate with the same diameter as the electrode is cut, and the thickness of the steel plate is t = 10 mm. The center of the steel plate mold (9) is found by finding the intersection of the two longest straight lines, and a hole is drilled at the center. An M16 nut (2) is welded to the steel plate mold (9) and placed near the movable end (7) of the electrode holding mechanism. The steel plate mold (9) is fixed to the holding mechanism using an M16*150 mm hex bolt (3). A tubular level (4) is used to measure the horizontal and vertical levelness of the steel plate mold (9). A plumb bob (5) is fixed at the center of the steel plate mold (9) and used as a reference line to adjust the center circle of the electrode cross arm (8).

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