JP2000144222A - Device for opening/closing molten slag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molten slag opening/closing device which can open/close the flowing path when the molten slag flows and unnecessitates a piling-up work of a bag containing refractories. SOLUTION: This molten slag opening/closing device is composed of a valve box 26 having a U-shape notching part 26a for passing through the molten slag at the upper part and arranged in a slag trough 1, a gas supplying tube 28 arranged at the bottom part of the valve box, a valve plate 25 having a passing hole 25a for molten slag at the upper part and vertically moving by guiding with a guide groove of the valve box and a vertically moving means 27 of the valve plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten slag opening / closing apparatus for blocking or flowing molten slag flowing in a gutter.

[0002]

2. Description of the Related Art Hot metal and molten slag flowing out of a taphole of a blast furnace are separated into hot metal and molten slag by a skinmer provided downstream of the tapping gutter, and the molten iron is converted into a hot metal gutter and the molten slag is converted into a slag gutter. Flows into. The molten slag that has flowed into the slag gutter is switched to a gutter for a granulation facility or a gutter for a dry pit based on a production plan for granulated slag and massive slag. For this switching, a slag gutter is provided with a molten slag opening / closing device for switching a slag flow.

FIGS. 3 and 4 show this molten slag opening and closing device.
This will be described below. The slag gutter 1 branches in the middle into a gutter 2 going to the granulation facility and a gutter 3 going to the dry pit, and a molten slag opening / closing device 5 is provided downstream of and near the branch line 4. As shown in FIG. 3, this molten slag opening and closing device 5
A valve plate 6 that shuts off or opens the flow path cross section of the slag gutter 1;
A valve plate mounting beam 7, a pair of pulleys 8 and 8 mounted on the beam, a pair of winding drums 9 and 9 mounted on the upper beam of the portal frame, and rotating the winding drum via a rotating shaft. The driving air motor 10 and one end are fixed to the upper beam, and the pulleys 8 and
8, a pair of wires 11, 11 whose other ends are engaged with the winding drums 9, 9, respectively, and the valve plate 6 is lifted with respect to the slag gutter 1 by rotating the air motor 10 forward and backward. It lowers and opens and shuts off the cross section of the flow path.

However, by the time the molten slag flows through the slag gutter 1 and reaches the branch line 4, the surface portion of the molten slag flow is air-cooled and solidified. In this state, even if the valve plate 6 is lowered from above to cut off the flow path, the valve plate 6 rides on the solidified layer 11 (see FIG. 4) of the formed slag.
The flowing slag flow cannot be cut off. For this reason, when flowing molten slag to the water granulation facility side gutter 2, when tapping slag is not performed, that is, when molten slag is not flowing through the slag gutter, the shutoff work is performed as follows.

[0005] The valve plate 6 is rolled down to the bottom of the flow path of the slag gutter, and the molten slag is prevented from leaking into the dry pit side gutter 3 from the gap between the flow path inner wall 13 of the slag gutter 1 and the valve plate 6. A bag 14 containing a refractory material was stacked on the side, and jointed with a castable refractory material to block the flow path.

[0006]

As described above, the conventional method of shutting off the flow path of a slag gutter cannot shut off the flow of molten slag, so that it is necessary to switch between the production of granulated slag and the production of massive slag. There were timing restrictions. In addition, blocking involves the work of a person stacking many refractory bags.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a molten slag opening / closing apparatus which can open and close a flow path when molten slag is flowing, and does not require stacking work of refractory-containing bags.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to provide a valve box having a cutout hole at the top through which molten slag passes and provided in a slag gutter, and a valve box provided at the bottom of the valve box. This is achieved by a molten slag opening / closing device having a gas supply pipe, a hole through which molten slag is passed at an upper portion, and a valve plate that moves up and down by being guided by a guide groove of the valve box, and means for vertically moving the valve plate. I do.

In the apparatus of the present invention, when the valve plate is lowered into the valve box and the upper hole of the valve plate is aligned with the U-shaped cutout hole of the valve box, the flow path of the slag gutter is opened. Conversely, when the valve plate is raised and the U-shaped cutout hole of the valve box is closed with the valve plate, the flow path of the slag gutter is closed. In this way, when the flow path of the slag gutter is closed, the hole of the valve plate is forcibly raised by the vertical movement means, so that a solidified layer of hard slag is formed on the surface layer of the molten slag flowing through the valve plate portion. Even if it is done, it can be broken at the edge of the hole of the valve plate that rises to close the flow path. That is, the flow path can be closed even when the molten slag is flowing.

Further, while the molten slag is flowing, pressurized air is supplied from the gas supply pipe to the bottom of the valve box, and the gap between the inner wall of the storage groove of the valve plate of the valve box and the valve plate is filled with the compressed air. In addition, the molten slag can be prevented from entering (inserting) into the gap. Therefore, the vertical movement of the valve plate is not hindered by the molten slag entering the gap and solidifying.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing a state in which the apparatus of the present invention is mounted on a slag gutter, and FIG. 2 is a sectional view taken along line AA of FIG.

The molten slag opening / closing apparatus 20 of the present invention comprises column members 22 and 22 and beam members 23 mounted on a slag gutter.
, A pair of fluid cylinders 27, 27 suspended from the portal frame, a mounting beam 24 connected to the rod end of the fluid cylinder, and a mounting beam attached to the mounting beam. And a valve box 26 having a storage groove for the valve plate fixedly mounted in the refractory of the slag gutter. The molten slag opening / closing device 20 is provided downstream and near the branch line as described in the related art.

1 is a slag gutter, and 1a is an outer shell iron plate of the slag gutter. A molded refractory brick 1b is stacked inside the outer shell iron plate 1a, leaving a concave portion which is open at the center of the gutter, and a castable refractory material having a predetermined thickness is applied to the inner wall of the concave portion. A valve box 26 formed of a refractory material, for example, a carbon brick material, is set in the concave portion to which the castable refractory material is applied,
The gap around the outer periphery of the valve box is filled with castable refractories and fixed to the slag gutter. The valve box 26 has a storage groove in which a valve plate described later moves up and down, and a U-shaped cutout hole 26a opened at the upper part is formed at the upper center.

The bottom edge of the U-shaped cutout hole 26a coincides with the bottom edge of the channel wall 13 of the slag gutter.

On the other hand, the slag gutter 1 to which the valve box 26 is attached
The column mounting bases 21 and 21 are fixedly provided so as to sandwich the valve box. A gate-shaped frame is mounted on the column mounts 21, 21. The portal frame is composed of pillar members 22, 22, and a beam member 23 bridged over these. At the left and right ends of the beam member 23, projecting portions 23 are provided.
a and 23a are formed, and the cylinder bottom of the fluid cylinder 27 is attached to each of these lower surfaces.
That is, the fluid cylinders 27 and 27 are vertically provided with the rods thereof facing down.

Numeral 24 is a mounting plate for the valve plate. The rod ends of the fluid cylinders 27 are connected to the left and right ends of the mounting beam 24, respectively. A vertical groove into which the upper part of the valve plate is inserted is formed at the center of the mounting beam 24. This flute, as shown in FIG.
It matches the storage groove of the valve box 26 described above.

A valve plate 25 is inserted into a storage groove of the valve box 26, and an upper portion thereof is inserted into a vertical groove of the mounting beam 24, and is fixed to the mounting beam by a plurality of bolts. The valve plate 25 has a hole 25a at the upper center thereof that substantially matches the edge of the cutout hole 26a of the valve box. When the fluid cylinders 27 and 27 are extended to the lower limit of the rod, the cutout hole 26a of the valve box and the hole 25a of the valve plate coincide with each other.
The notch 26a of the valve box is closed by the valve plate 25,
A valve box 26 and a valve plate 25 are mounted. Valve plate 2
When 5 is lowered to the lower limit position, a gap of a predetermined size is formed between the lower end of the valve plate and the bottom of the valve box. Gas supply nozzle 28 for supplying pressurized air to this gap
a, 28a are provided to protrude. Gas supply pipe 28
The gas supply nozzle 2 is disposed downward from the upper part of the slag gutter 1 through the interior of the castable refractory.
8a and 28a.

Next, a method for opening and closing a slag flow channel by the apparatus of the present invention will be described. Before flowing molten slag to slag gutter 1,
The compressed air is supplied to the valve box 26 in advance. When closing the flow path of the slag gutter, the rods of the fluid cylinders 27, 27 are shortened to the upper limit, and the cutout hole 26a of the valve box is inserted into the valve plate 25.
Close with. Conversely, when opening the channel of the slag gutter,
The rods of the fluid cylinders 27, 27 are extended to the lower limit, and the notch hole 26a of the valve box is aligned with the hole 25a of the valve plate, thereby connecting the front and rear of the opening and closing device. Needless to say, the opening and closing operation of the flow channel by the device of the present invention can be performed by remotely operating the fluid cylinder via the control device.

[0020]

Since the present invention is constructed as described above, it is possible to open and close the flow passage even when molten slag flows through the slag gutter, thereby switching between the production of granulated slag and the production of massive slag. Can be performed at any time without restriction.
In addition, since the stacking of the refractory-containing bags and the jointing work required in the conventional apparatus can be eliminated, the labor for opening and closing work can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which the apparatus of the present invention is attached to a slag gutter.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view showing a state in which a flow path of a slag gutter is cut off by a conventional flow path opening / closing device.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 slag gutter 13 flow path wall 20 molten slag opening / closing device of the present invention 22 column member 23 beam member 24 mounting beam 25 valve plate 25a hole 26 valve box 26a U-shaped notch hole 27 fluid cylinder 28 gas supply pipe 28a Gas supply nozzle

Claims (1)

[Claims] 1. A valve box provided in a slag gutter having a notch hole for passing molten slag at an upper portion, a gas supply pipe provided at a bottom portion of the valve box, and a hole for passing molten slag at an upper portion. Having a valve plate that is guided in the storage groove of the valve box and moves up and down,
A molten slag opening / closing device comprising means for vertically moving the valve plate.