JPS6219905Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an enclosure hood for an electric furnace.

During the operation of an arc furnace for steelmaking, a large amount of dust is generated and a large amount of noise is generated due to the arc discharge between the electrode and the raw material.As a means to prevent this dust and noise from leaking outside the factory, In addition to surrounding the arc furnace with soundproof walls,
A soundproof cover that can be moved freely along the rail is installed on top of the soundproof cover, and a dust collection elbow is attached to this soundproof cover.When charging raw materials such as scrap into the arc furnace, the soundproof cover is moved along the rail. There is a known method in which the arc furnace is moved from the top to the side (see Japanese Utility Model Publication No. 53-35535).

However, the above-mentioned known means forms a hood that surrounds the arc furnace with soundproof walls around the arc furnace and an upper soundproof cover, and if necessary, the entire upper soundproof cover (i.e. ceiling plate) is slid horizontally. Because it is a moving device, a large drive source and a complicated moving mechanism are required to move the large and heavy ceiling board, and furthermore, the material charging bucket suspended from the overhead crane does not hit the soundproof wall. In order to do this, it was necessary to install the overhead crane at a higher location than before, which resulted in high equipment costs and a long waiting time when transporting the bucket.

This invention provides an electric furnace enclosure hood that does not require moving the ceiling plate or increasing the height of the overhead crane.

An embodiment of this invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes an electric furnace (arc furnace) for steelmaking, and as shown in FIG.
It is installed so that it can be tilted freely, and has an operating port 1a on the front (right side in Fig. 2) and a tapping gutter 1b on the rear, and a furnace smoke elbow 4 and an electrode mast 5 on the top. A lid 6 that can be opened and closed is attached. Furthermore, 7 is a ladle, 8 is an overhead crane, and 9 is a ladle.
1 is a rail, 10 is a bucket for charging raw materials such as scrap, and a smoke collection pipe 11 is slidably connected to the above-mentioned furnace smoke elbow 4, as shown in FIG. The dust collector is connected to the dust collector via a duct or a duct (not shown). The enclosure hood 13 for enclosing the electric furnace 1 has a front wall 14,
Left and right side walls 15, 15, rear wall 16 and ceiling board 1
7 is formed into a box shape, and the smoke collection pipe 1
1 is provided to penetrate the side wall 15. In the front wall 14, a front opening 14a reaching both upper and lower ends is formed in a portion facing the operation opening 1a of the electric furnace 1, and a pair of left and right double doors 18, 18 are provided in the upper half of this front opening 14a. Installed. Also, ceiling board 1
A rectangular upper surface opening 17a communicating with the above-mentioned front surface opening 14a is formed in the front part of 7, and the ceiling plate 1 is formed along the left opening edge 17b of this upper surface opening 17a
An air curtain injection nozzle 19 is attached to the lower surface of the air curtain 7, and a blower (not shown) is connected to this air curtain injection nozzle 19 via air pipes 20a and 20b. A hood smoke duct 21 is attached to the upper part of the rear wall 16, and a dust collector is connected to the hood smoke duct 21 via a duct (not shown). In addition, 1
4b is a glass window provided on the front wall 14 for monitoring the furnace.

In the above structure, air curtain nozzle 1
By blowing out air from 9, the top opening 17
An air curtain 19a is formed at the upper surface opening 17a, and communication between the inside and outside of the upper surface opening 17a is blocked. However, since this interruption is by the air curtain 19a, when the double doors 18, 18 are opened, the charging bucket 10 is moved by the overhead crane 8.
can be immediately carried onto the electric furnace 1.
When the double doors 18, 18 are closed, the four circumferences and upper part of the electric furnace 1 are almost completely surrounded by the enclosure hood 13, so leakage of noise generated from the electric furnace 1 is almost completely prevented. Gas and dust generated during melting and tapping do not leak to the outside, and these gases and dust are sucked by the hood smoke duct 21 and sent to the dust collector. The upper surface opening 17a is connected to the charging bucket 10.
Since the blower for forming the air curtain 19a can be made small as long as it does not interfere with the ingress and egress of the air curtain 19a, a small-capacity blower may be sufficient. In addition, since the double door 18 on the front wall 14 can be opened to allow the charging bucket 10 to be taken in and out, the height of the rail 9 can be made lower than when the double door 18 is not provided and the four peripheries are fixed walls. However, it can be the same as not providing the enclosure hood 13 at all.

In the above embodiment, as shown in FIG.
A suction nozzle 22 is provided opposite to the air curtain injection nozzle 19, and a suction air pipe 23 connected to this suction nozzle 22 is connected to the hood suction duct 2.
1 may be connected to the duct 24 in parallel with the air curtain 19a, in which case the airflow of the air curtain 19a is prevented from stirring up dust floating within the enclosure hood 13. Further, sliding doors may be provided in place of the double doors 18, and these doors can be automatically opened and closed in conjunction with the movement of the overhead crane 8. Further, a part of the ceiling plate 17 may be formed to be detachable like a drop lid, and in this case, the repair and replacement work of the furnace smoke elbow 4, tapping gutter 1b, electrode mast 5, etc. can be performed using a crane. It becomes easier. The electric furnace 1 described above is not limited to an arc furnace for steelmaking, but may be a low frequency furnace or high frequency furnace for special alloys, a refining furnace using a ladle, or an open furnace. Furthermore, when tapping the ladle with the ladle suspended by a crane, a door and an air curtain similar to the operation opening may be provided on the side wall (rear wall 16) on the tapping opening side.

As explained above, this invention is a box-shaped electric furnace enclosure hood that covers all four sides and the upper part of the electric furnace, and is equipped with a smoke suction duct. A front opening that reaches both the upper and lower ends is provided, a door is attached to this front opening, and an upper opening that is continuous with the front opening is provided at the front of the ceiling plate, and this upper opening is closed with an air curtain. Since the charging bucket transported by the loader can enter and exit through the above-mentioned top opening and front opening, noise and dust leakage can be prevented, and the entire ceiling panel can be moved freely as in the past. It is possible to simplify the structure and save energy consumption, eliminate the waiting time when transporting the charging bucket, and reduce the equipment cost by lowering the height of the rail for the overhead crane. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of this invention, FIG. 2 is a side view of an example of an electric furnace, and FIG. 3 is a vertically cut front view of a modified example of the air curtain device. 1: Electric furnace, 1a: Operation opening, 13: Enclosure hood, 14: Front wall, 14a: Front opening, 15: Side wall, 16: Rear wall, 17: Ceiling plate, 17a: Top opening, 18: Door, 19a: Air curtain, 21: Smoke duct (smoke duct for hood).

Claims (1)

[Scope of Claim for Utility Model Registration] [1] In a box-shaped electric furnace enclosure hood that covers the four circumferences and upper part of the electric furnace and is equipped with a smoke suction duct, the front wall facing the operation opening of the electric furnace A front opening reaching both the upper and lower ends of the ceiling board is provided, a door is attached to this front opening, and an upper opening is provided in the front part of the ceiling plate that is continuous with the front opening, and this upper opening is closed with an air curtain, and the ceiling crane is installed. An enclosure hood for an electric furnace, characterized in that a charging bucket to be conveyed can enter and exit through the top opening and front opening. [2] The enclosure hood for an electric furnace according to claim 1, wherein the air curtain is formed below the ceiling plate. [3] The electric furnace according to claim 2 of the utility model registration claim, wherein the air curtain is formed by an injection nozzle and a suction nozzle facing each other, and the suction nozzle is connected to a smoke suction duct. enclosure hood.