JP3550021B2 - Raw material preheating equipment for arc furnace - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus for preheating an arc furnace charge material used for melting a metal material and refining a molten metal.
[0002]
[Prior art]
As a refining arc furnace, an electric current is passed between an electrode disposed above a metal material charged into the furnace and an electrode attached to a furnace bottom or a side wall, etc., to melt the metal material and refine the molten metal. A DC arc furnace or an AC arc furnace in which a current flows between three electrodes disposed above a molten metal charged into the furnace to melt a metal material and refine a molten metal is used. In this type of arc furnace, if the sensible heat of the high-temperature exhaust gas generated during melting and refining is used to preheat the metal material charged into the furnace, the heat energy used for melting and refining can be saved. it can. Various devices have been conventionally proposed as devices for preheating a charged material using the sensible heat of an exhaust gas from an arc furnace. The method of holding and preheating the raw material in a preheating vessel called a shaft provided on the furnace lid of the arc furnace is an advantageous method in terms of heat recovery because the high-temperature exhaust gas from the arc furnace can be directly used, but on the other hand, Therefore, there is a problem that the material holding gate provided at the lower end in the shaft receives a drop impact load when the material is charged into the shaft, and is exposed to high-temperature exhaust gas during preheating. In order to solve this problem, the invention described in Japanese Patent Application Laid-Open No. 8-285476 has a shaft for preheating the material provided movably in the horizontal direction, a raw material charging portion and an exhaust gas outlet at the top of the shaft, and a shaft at the bottom of the shaft. A holding gate for holding the charged material and an exhaust gas inlet were provided. The shaft is moved to the preheating position near the arc furnace, the raw material bucket is arranged above the shaft, the raw material is charged into the shaft from the raw material bucket through the raw material charging section at the top of the shaft, and the arc furnace is discharged from the exhaust gas inlet of the shaft. Preheating of the charged material is performed by introducing exhaust gas into the shaft. After completing the preheating, the shaft is moved horizontally above the furnace body, and the raw material is charged into the arc furnace by opening the holding gate at the bottom of the shaft. This solves the problem that the holding gate provided at the lower end in the shaft is exposed to a high temperature during preheating. Regarding the drop impact force at the time of charging the charged material, as described in Japanese Patent Application Laid-Open No. 8-54191, an impact device such as a spring or the like in a limited space around the holding gate body or the holding gate rotation axis. Is installed.
[0003]
[Problems to be solved by the invention]
In the prior art, a shaft for preheating the charge is arranged fixedly above the furnace body or movably in the horizontal direction. When charging the raw material into the shaft, the raw material is loaded into the raw material bucket, the raw material bucket is placed above the shaft by a crane, and the gate provided at the bottom of the raw material bucket is opened. Done.
[0004]
The raw material is dropped and charged into a material container arranged below the raw material bucket. At this time, the holding gate at the bottom of the material container is closed to receive the falling raw material. For this reason, the holding gate at the bottom of the material container needs to have a strong structure, and even so, damage to the holding gate could not be completely suppressed. Also, the lifting device may be damaged by the impact.
[0005]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-mentioned problems, and a gist of the invention is a moving device that can move between an arc furnace arrangement position and a material preheating position by placing a material container and the material container. In a raw material preheating apparatus for an arc furnace for preheating a raw material, a gantry for mounting the material container at a material preheating position is disposed, and a gantry is provided between the gantry and the material container. An apparatus for preheating a raw material for an arc furnace, comprising a plurality of shock absorbers configured by coil springs and tie bolts for reducing impact.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples.
[0007]
【Example】
FIG. 1 is a side view showing one embodiment of the present invention, showing a side view when a material container is located at a raw material preheating position. FIG. 2 is a view as viewed in the direction of arrows AA in FIG. FIG. 3 is a plan view of the upper beam. FIG. 4 is an embodiment of the shock absorber of the present invention, and FIG. 5 is a sectional view of the shock absorber. FIG. 6 is a view taken in the direction of arrows FF in FIG. 1, and FIG. 7 is a view showing a case where a charged material after completion of preheating is charged into the arc furnace.
[0008]
In FIG. 1, the material container 1 is placed on a gantry 13 arranged at a charged material preheating position. In this state, the raw materials mounted on the charging bucket 8 are carried into the upper part of the material container 1 by the charging crane 9, and the charging bucket 8 is opened to charge the charging material 18 into the material container 1. The material container 1 is connected to a moving device 3 via a link lever 15 and an arm 16 by a support post 10, and the moving device 3 moves the charged material to a preheating position and a charging position to the arc furnace 2. It is possible. The moving device 3 is mounted on a turning device 5 and is configured to be able to turn and move between a charged material preheating position and a charged material charging position into the arc furnace. The support post 10 is mounted on a turning device of the moving device 3, and the arms 16 are fixed to both sides of the material container 1 so as to sandwich the material container 1. The support post 10 and the arm 16 are pin-joined by a link lever 15.
[0009]
Further, FIG. 6 shows the details of the link lever 15 as viewed from the direction of arrows FF in FIG. In FIG. 6, a link lever 15 is connected to a connecting beam 32, and the connecting beam 32 is moved up and down by an elevating cylinder 11, whereby the arm 16 and the material container clamped by the arm 16 via the link lever 15 with the support post 10 as a fulcrum. 1 goes up and down. As described above, when the material container 1 is arranged at the preheating position of the charged material by the raising / lowering cylinder 11, the lifting cylinder 11 is lowered to place the material container on the gantry 13 arranged at the preheating position of the charged material. . When the placement of the material container 1 is completed, the elevating cylinder 11 is further lowered to secure the gap 20 so that the connecting beam 32 does not contact the elevating cylinder 11. When the preheating of the charged material is completed, the lifting cylinder 11 is raised, and the tip of the lifting cylinder 11 is brought into contact with the connecting beam 32 and the spherical seat 14 attached to the link lever 15 to push up the link lever 15 to raise the material container 1. Let it. Then, the moving device 3 on which the support post 10 is mounted is turned to move to the charging material charging position of the arc furnace 2 shown in FIG.
[0010]
FIG. 3 is a plan view showing the upper beam 26 including the shock absorber of the present invention, and FIG. 4 is a front view of the upper beam 26 as seen from the direction D-D. FIG. 5 is a sectional view of the shock absorber of the present invention. The lower beam 13a is arranged on the gantry 13 arranged at the preheating position of the charged material, and the upper beam 26 is arranged above the 13a with a predetermined gap. The coil spring 22 projects out of the upper surface of the lower beam 13a by a predetermined dimension and is embedded in the lower beam 13a with a predetermined gap 25, and the upper beam 26 is placed on the coil spring 22. Then, the lower beam 13a and the upper beam 26 are set with a tie bolt 23 so as to form a predetermined gap 25. In addition, guide pins 24 are provided on the lower frame 13a and the upper frame 26 so that the buffer operation is performed smoothly. The four circumferences of each of the left and right gates of the holding gate 17 are supported from below by an upper beam 26, and the upper beam 26 is connected to the lower beam 13a by a shock absorber. Absorption absorbs damage to the holding gate at the bottom of the material container.
[0011]
【The invention's effect】
Even if the raw material is charged into the material container at the material preheating position, the shock load due to the fall of the charged material is absorbed by the shock absorber, so that damage to the holding gate at the bottom of the material container can be suppressed, and Also, it is possible to prevent an impact on the lifting device.
[Brief description of the drawings]
FIG. 1 is a side view showing one embodiment of the present invention, in which a material container is located at a raw material preheating position.
FIG. 2 is a front view taken along the line AA of FIG.
FIG. 3 is a plan view of an upper beam as viewed from a section BB in FIG. 2;
FIG. 4 is a front view of one embodiment of the shock absorber according to the present invention.
5A and 5B are cross-sectional views of the shock absorber of FIG. 4, wherein FIG. 5A is a cross-sectional view taken along a line DD and FIG.
6 is a partial elevational view as viewed in the direction of arrows FF in FIG. 1; FIG. 7 is a diagram showing a case where a charged material after completion of preheating is charged into an arc furnace;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Material container 2 Arc furnace 3 Moving device 4 Elevating device 5 Rotating device 6 Exhaust gas inlet duct 7 Cylinder tip 8 Input bucket 9 Input crane 10 Support post 11 Elevating cylinder 12 Container lid 13 Stand 13a Lower beam 14 Spherical seat 15 Link lever 16 Arm 17 Holding gate 18 Charge material 19 Furnace lid 20 Gap 21 Exhaust gas duct 22 Coil spring 23 Tie bolt 24 Positioning pin 25 Gap 26 Upper beam 27 Outlet duct 28 Bypass duct 29 Arc furnace charging position 30 Material charging position 31 Material preheating position 32 Connecting beam

Claims (1)

In a raw material preheating device for an arc furnace for preheating a raw material having a material container and a moving device capable of moving between an arc furnace arrangement position and a material preheating position by placing the material container, the material container is mounted at the material preheating position. An arc furnace comprising: a plurality of shock absorbers each including a coil spring and a tie bolt for reducing an impact caused by a material charged into the material container between the mount and the material container. Raw material preheating equipment.

Images