JP2500746Y2 - Continuous charging equipment for electric furnace - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material charging device in an electric furnace used for melting metal materials, refining molten metal, and the like.

[0002]

2. Description of the Related Art The charging of materials into an electric furnace used for melting metal materials, refining molten metal, etc. is usually carried out as follows. That is, the material is loaded in advance in a container called a bucket and is transported to the vicinity of the electric furnace by an overhead crane. The electric furnace has a furnace lid that can be swung, and the furnace lid is swung to open when charging materials. After that, the bucket is moved onto the furnace, the bottom of the bucket is opened, and the material is put into the furnace. Material input to electric furnace is 2 per heat
~ 3 so-called batch charging. However, with this method, the furnace lid is always opened when the material is charged, so the heat dissipated from the furnace is large and the energy loss increases.

Therefore, various methods and devices for continuously charging the material have been proposed as a method for charging the material without opening the furnace lid. Japanese Patent Application Laid-Open No. 61-502899 proposes a method of continuously charging a material into a furnace while preheating the material by utilizing only one flue for sucking exhaust gas. However, according to this method, the material is intensively charged in one place in the vicinity of the furnace wall in the furnace and easily deposited, so that the solubility is poor and unmelted residue is likely to occur. In order to avoid this, the charging material is always settled in the molten metal, and the material charging speed is controlled so that the material is not exposed above the molten metal surface. Heat from the arc generated at the electrodes is not efficiently transferred to the material, increasing energy loss.

On the other hand, in Japanese Utility Model Laid-Open No. 51-106210, a device for continuously charging the material from the upper part of the furnace body is used, and by rotating the lower part of the furnace body, the material is uniformly charged in the circumferential direction of the furnace. The method of doing is proposed. However, according to this method, since the lower furnace body having a high weight is swung, the turning device becomes extremely large. Therefore, there are problems that the equipment cost increases, the running cost increases, and the maintainability deteriorates. In particular, in the case of a DC electric furnace, since the lower electrode is installed on the furnace bottom or the furnace wall on the lower furnace body side, the method of supplying power to the lower electrode may be complicated or difficult. Further, when the molten metal in the furnace is tapped, since the swivel device that swivels the lower furnace body is installed on the fixed side, it is difficult to adopt the tilting tapping method that is usually performed, and the tapping method is limited. .

[0005]

Therefore, in the present invention, the material can be continuously and uniformly charged into the furnace, and the structure is simple, and it can be applied to a DC electric furnace and a tilting hot water type furnace which is usually used. It is an object to provide an applicable continuous charging device for materials.

[0006]

In order to solve the above problems, a material continuous charging apparatus according to the present invention comprises a hopper having a material charging opening at the outer peripheral portion of the furnace lid over the entire circumference thereof. It is characterized by comprising a turning means for turning the hopper, and a charging means for disposing a hood covering the hopper and continuously supplying the material into the hopper.

[0007]

[Function] Since the material charging hopper is rotatably installed on the outer peripheral portion of the furnace lid and the material charging opening is present all around, the material is uniformly loaded all around the furnace wall side in the furnace. Be entered. Therefore, the material is uniformly present over the entire circumference of the furnace wall side in the entire melting period, the arc is always surrounded by the material, and the radiant heat of the arc is transferred to the material while minimizing the heat loss. It is possible to operate at maximum voltage with high voltage until the end of melting.

Further, in the case of a DC electric furnace, the force with which the arc jet collides with the molten metal surface is greater than that in the AC electric furnace.
The droplets of the molten metal generated when the arc jet collides with the surface of the molten metal are intensely scattered on the furnace wall side. Therefore, as in the operating method of the present invention, if the materials are always present over the entire circumference of the furnace wall side, the molten metal droplets at high temperature come into contact with these materials to promote the melting. Furthermore, the possibility that the material will collapse toward the upper electrode during melting and cause breakage of the upper electrode is greatly reduced.

On the other hand, since the rotatable material charging hopper is provided on the outer peripheral portion of the furnace lid, it is not necessary to rotate the furnace body, and the apparatus structure is simplified. Further, since it is not necessary to swirl the lower part of the furnace body, it can be applied to a DC electric furnace having a lower electrode on the furnace bottom or the furnace wall, or a tilting tapping type furnace.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional view of a furnace body of the present invention, showing a state where materials are continuously charged. An annular hopper 2 is provided on the outer peripheral portion of the furnace lid 1, and is placed on the furnace lid frame 4 by wheels 3. The outer circumference of the hopper 2 has a tooth profile 5 over the entire circumference.
Is turned off, and the speed reducer 6 is connected. An electric motor 7 is connected to the speed reducer 6, and the hopper 2 has a structure capable of turning via the speed reducer 6.

The material 9 is continuously charged into the hopper 2 through the charging chute 8 and the material 9 is charged into the hopper 2.
Is uniformly charged over the entire circumference on the furnace wall side in the furnace in accordance with the turning of the hopper 2, and surrounds the arc generated from the upper electrode 10. The droplets 11 generated when the arc jet collides with the surface of the molten metal are brought into contact with the material charged in the furnace to promote the melting.

An annular hood 12 is provided above the hopper 2.
And is fixed on the furnace lid frame 4. The gas generated from the inside of the furnace is discharged from the charging chute 8 through this hood 12. Normally, the gas generated in the furnace has a high temperature, so that the material 9 is preheated in the charging chute 8 by the high temperature exhaust gas.

FIG. 2 shows a plan view of the furnace body. Here, an example is shown in which the material feeding chutes 8 are installed at three places in total. The more material installation chutes 8 are provided, the smoother the material supply to the hopper 2, but the number of installations may be arbitrarily selected in consideration of the compatibility with peripheral devices.

FIG. 3 shows the internal structure of the hopper 2. Both the upper part and the lower part of the hopper 2 have openings over the entire circumference, and the material can be charged into the furnace anywhere in the circumferential direction of the hopper 2. Hopper 2
The material 9 charged into the inside of the furnace is sequentially charged into the furnace according to the partition and slope 13. However, since the hopper 2 is swirling, the material 9 is uniformly charged all around the furnace wall side of the furnace. It However, inside the hopper 2 is a partition and slope 13
Since it is divided by, when turning at the same speed, when the charging chute 8 and the upper end of the partition / slope 13 match, it is difficult to charge the material, and the charging amount becomes uneven in the circumferential direction. . Therefore, when the upper end of the partition / slope 13 reaches below the charging chute 8, the turning speed control may be performed by once stopping the turning, charging a certain amount of material, and then starting the turning again.

[0015]

EFFECT OF THE INVENTION Since the hopper for material charging which can be swung is provided on the outer peripheral portion of the furnace lid, it is not necessary to swivel the furnace body, the apparatus configuration is simplified, and the installation cost can be reduced. At the same time, since the turning weight is extremely reduced, the electric motor capacity is also reduced and the power consumption is reduced. Further, since it can be applied to a direct current electric furnace having a lower electrode on the bottom or wall of the furnace, or a tilting tapping type furnace, it can be installed in a normal existing electric furnace with a slight modification.

Further, since the material is present uniformly over the entire circumference of the furnace wall side in the furnace for almost the entire melting period, the arc is always surrounded by the material, and the radiant heat of the arc is minimized while minimizing heat loss. It can be transferred to the material and a highly heat efficient melting can be realized. Therefore, the operating cost can be reduced and the productivity can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a furnace body of the present invention, showing a state where materials are continuously charged.

FIG. 2 shows a plan view of a furnace body.

FIG. 3 shows an internal structure of a hopper.

[Explanation of symbols]

 1 Furnace Lid 2 Hopper 3 Wheel 4 Furnace Lid Frame 5 Tooth Profile 6 Reducer 7 Electric Motor 8 Input Chute 9 Material 10 Upper Electrode 11 Splash 12 Hood 13 Partition / Slope 14 Opening

Claims (1)

(57) [Scope of utility model registration request] 1. A continuous material charging device for an electric furnace, comprising: a hopper having a material charging opening around the entire circumference of a furnace lid; a turning means for turning the hopper; and a hood covering the hopper. And a charging means for continuously supplying a material into the hopper, and a material continuous charging device for an electric furnace.