JPH0765095B2 - Vacuum degassing tank bullion recovery device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a vacuum degassing apparatus for performing secondary refining of molten steel in a steelmaking factory, and in particular, a DH having a lower tank exchanging truck of a vacuum degassing tank. Alternatively, it relates to a bullion recovery device in an RH type vacuum degassing device.

<Prior Art> In a vacuum degassing apparatus, when the internal temperature of a vacuum degassing tank (hereinafter referred to as a degassing tank) is low during secondary refining of molten steel, it may be difficult to process the molten steel. However, it is necessary to heat the inside to keep heat even during the process interruption (hereinafter referred to as non-process time).

This heating is generally performed by burning a fuel gas by using a burner arranged in the upper part of the degassing tank (Japanese Patent Laid-Open No. 2-77517, etc.). In many cases, the combustion exhaust gas generated at this time is discharged from the immersion pipe at the bottom of the degassing tank, guided to the outside of the device by the exhaust gas duct, and discharged.

Further, during degassing of molten steel, the molten steel being processed is scattered and adheres to the degassing tank to form a so-called ingot. This metal needs to be recovered because it melts and drops when the degassing tank is heated.

FIG. 4 shows an example of the bullion recovery device disclosed in the above-mentioned Japanese Patent Laid-Open No. 2-77517.

In the figure, the degassing tank A is heated by burning the fuel gas by the burner B at the time of non-treatment. Then, the combustion exhaust gas is discharged from the immersion pipe S into the bag E, and is further guided to the outside of the apparatus by the duct D to be diffused. At this time, the metal M in the degassing tank A also drops and accumulates in the bag E.

The bag E is placed on the dolly C, carried in and out of the lower portion of the degassing tank A, and moved up and down by the elevating device L so that it can be engaged with and disengaged from the immersion pipe S and the duct D.

<Problems to be Solved by the Invention> Usually, the degassing tank is divided into upper and lower parts, and the lower tank is often replaced and repaired by a lower tank replacement cart. Therefore,
In order to install the trolley C, each device in the vicinity of the degassing tank is complicated and the work area is unnecessarily narrowed, and the moving route between the lower tub exchanging trolley and the trolley is also complicated, and its operation is also difficult. Not only will it be troublesome, but the equipment costs will also be large.

Further, the bag E needs to be discharged to the outside of the apparatus by the trolley C, but the metal must be discharged. However, after removing the lid or opening the metal discharge port, the bag E must be inclined and discharged by some method. . Therefore, it is necessary for the worker to approach the bag E containing the high temperature metal, which is time-consuming and requires a tough work.

The present invention solves the problems of the conventional techniques as described above, and provides a bullion recovery device that is inexpensive in equipment cost as a bullion recovery device for a degassing tank and that can easily perform a bullion discharging operation. To aim.

<Means for Solving the Problem> The present invention relates to a bullion recovery device for a vacuum degassing tank having a lower tank exchange cart, which has a trunnion for opening the whole top surface and tilting when the bullion is discharged. At the time, it has a lower container for collecting metal that is placed on the lower tank exchange cart and a hanging hand, and has an opening on the upper surface through which the immersion pipe of the vacuum degassing tank can be inserted and a connecting duct for combustion exhaust gas. The upper hood, which is placed on the lower container for collecting metal when in use, and the upper hood which is located above the moving path of the lower tank exchanging carriage that does not interfere with the degassing tank when the upper hood is not in use. The above-mentioned problems in the prior art are solved by configuring the metal collecting device from the hanging member provided on the lower surface of the work floor for suspending and holding the hood.

<Operation> The metal collecting container is divided into a lower container and an upper hood, and the lower metal collecting container (hereinafter simply referred to as the lower container) has the entire upper surface open so that the metal can be easily taken out when the metal is discharged. In addition, since the trunnion is provided, the container itself can be easily tilted and automation is possible.

Further, since the lower container can be moved and moved up and down by being placed on the lower tank exchange cart of the degassing tank, no special carrying-in / out facility is required for the bullion recovery work.

On the other hand, the upper hood is provided with an opening on the upper surface thereof so that the immersion pipe of the degassing tank can be inserted therein and a connecting duct for combustion exhaust gas is provided. Furthermore, a lifting handle is attached to this upper hood.

A suspending member is provided on the lower surface of the work floor for suspending and holding the upper hood at a position above the moving path of the lower tank exchanging carriage that does not interfere with the degassing tank when the upper hood is not used.

Therefore, when the upper hood is not used, the upper hood can be held by the hanging member provided on the lower surface of the work floor to stand by.

The suspension member and the upper hood lifter move the lower tank exchanging cart by bringing the upper surface of the lower container placed on the elevating table of the lower tank exchanging cart into contact with the lower surface of the upper hood and slightly lifting it. It is possible to take it off and on naturally.

<Embodiment> FIGS. 1 to 3 are drawings showing an embodiment of a metal collecting device for a degassing tank according to the present invention. FIG. 1 is a sectional view of a lower container and an upper hood, and FIG. 2 is an upper portion. FIG. 3 is a plan view of the hood as seen from above, and FIG. 3 is an explanatory diagram of a procedure for loading and unloading in the degasser.

In FIG. 1, reference numeral 1 is a lower container, and the container is a trunnion.
11 and 11 are provided, and the entire upper surface is open. And 10 is an iron skin and 10 'is a refractory material.

Reference numeral 2 is an upper hood, which is placed on the upper surface of the lower container 1 when used as shown in FIG. Numerals 21 and 21 are trunnions serving as lifting hands, which engage with a hanging member 3 shown in FIG. 3 described later to hold the upper hood. Reference numeral 22 denotes an opening into which the immersion pipe S of the degassing tank A is inserted, which has a diameter slightly larger than the outer diameter of the immersion pipe S. Reference numeral 23 is a connection duct for connecting to the combustion exhaust gas duct D. The trunnion 21, the opening 22, and the connection duct 23 are arranged as shown in FIG. 2 in this example.

Further, reference numeral 24 is a stopper for preventing a displacement when it is piled up on the lower container 1, and is a strip-shaped iron piece, a steel bar or the like attached to the lower portion of the upper hood 2 by welding an appropriate number. 20 is iron skin and 20 'is refractory.

With reference to FIG. 3, the procedure of loading and unloading the bullion recovery device in the degassing apparatus according to the present invention will be described, which also serves as the description of the suspension member 3.

In FIG. 3, the lower container 1 is placed outside the degasser on the lift LT of the lower tank exchange truck AC by, for example, a crane (not shown), and is first loaded to the position J in the direction of arrow Xa. .

On the other hand, the upper hood 2 is hung by the hanging member 3 attached to the lower surface of the work floor F via the hanger 21 above the moving path of the lower tank exchange cart AC that does not interfere with the degassing tank A, and stands by. There is. In this example, the hanging member 3 is a hook, and
Is a trunnion, but this may be reversed, and in any case, as will be described later, movement of the lower tank exchange cart AC in the direction of arrow Xa brings the hanger 21 and the hanging member 3 into an engaged state, and conversely arrow Xb. It must be configured to move away in a direction.

In the state shown in FIG. 3, the lower container 1 is operated by operating the elevating device L of the lower tank exchange cart AC, and the upper surface of the lower container 1 is brought into contact with the lower surface of the upper hood 2 and then slightly lifted together with the upper hood 2. . Then, when the lower tank exchange cart is returned in the direction of the arrow Xb opposite to the carrying-in direction, the hanging member 3 and the hanging hand 21 of the upper hood 2 are naturally separated.

Then, the whole is once lowered, further moved in the direction of the arrow Xb, and stopped at a position H directly below the degassing tank A. While aligning the opening 22 of the upper hood 2 and the dip tube S in that state, the whole is lifted to the state where the dip tube S is inserted into the opening 22 (FIG. 1), and the connection duct 23 and the duct D Connect to complete the preparation.

After the heating of the degassing tank is completed, the operation reverse to the above is performed to put the upper hood 2 in the standby state by the hanging member 3 on the lower surface of the work floor F, and the lower container 1 is replaced with the contained metal in the lower tank. It is carried out of the degasser by a trolley.

The lower container 1 carried out of the degassing device is carried to a position such as a bullion discharge pit by a crane or the like (not shown), and mounted on the lower container tilting device via the trunnions 11, 11 and then tilted backward. By rolling, the metal can be discharged very easily.

<Effects of the Invention> As described above, the metal collecting device of the degassing apparatus according to the present invention divides the metal collecting container into a lower container and an upper hood, which are vertically divided into two.
The lower container can be moved and lowered by a lower tank exchange trolley, so no special trolley or lifting device is required, and a trunnion is provided, so it is extremely easy to discharge the metal using a tilting device. You can also

In addition, the upper hood has a lifting member provided on the lower surface of the work floor on the moving path of the lower tank exchange cart at a position where it does not interfere with the degassing tank, and the operation of the lower tank exchange cart on which the lower container is placed. Since it can be automatically engaged and disengaged by using it, the upper hood can be put on standby and only the lower container can be carried out to the outside of the degassing device. You don't have to approach a bullion container.

Therefore, it is possible to construct an apparatus for collecting bullion extremely inexpensively, and the working environment is significantly improved.

[Brief description of drawings]

1 to 3 are drawings showing an embodiment of a metal collecting device for a vacuum degassing tank according to the present invention. FIG. 1 is a sectional view of a lower container and an upper hood, and FIG. 2 is an upper surface of the upper hood. FIG. 3 is a plan view seen from the above, FIG. 3 is an explanatory view of the loading and unloading procedure in the degassing device, and FIG. 4 is an explanatory view showing an example of a conventional bullion recovery device. 1 …… Lower container for collecting metal, 10 …… Steel skin, 10 ′ …… Refractory, 11 …… Trunnion, 2 …… Upper hood, 20 …… Steel skin, 20 ′ …… Refractory, 21 …… Lifter, 22 ... Opening, 23 ... Connection duct, 24 ... Stopper, 3 ... Suspending member, A ... Vacuum degassing tank, S ... Immersion pipe, D ... Exhaust gas duct, AC ... Lower tank Exchange cart, L ... Lifting device, LT ... Lifting platform.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Yokoyama 1-chome, Mizushima Kawasaki-dori, Mizushima Steel Works, Kurashiki City, Okayama Prefecture (56) Reference, Japanese Patent Laid-Open No. 2-77517 (JP, A) ) JP-A-62-10207 (JP, A)

Claims (1)

[Claims] 1. A metal collecting device for a vacuum degassing tank having a lower tank exchanging truck, wherein the lower tank exchanging truck has a trunnion for opening the entire upper surface and tilting when the bullion is discharged. It has a lower container for collecting metal to be placed, a hanger, and an opening on the upper surface to insert the immersion pipe of the vacuum degassing tank and a connecting duct for combustion exhaust gas. To suspend and hold the upper hood placed on the lower gold collecting container and the upper hood at a position above the moving path of the lower tank exchanging carriage that does not interfere with the degassing tank when the upper hood is not used. A bullion recovery device for a vacuum degassing tank, comprising: a suspension member provided on the lower surface of the work floor.