JP2003247011A - Method and device for opening/closing molten metal tapping hole for metallurgical furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a single device for opening/closing a molten metal tapping hole used for both functions of the opening and the closure of the molten metal tapping hole. <P>SOLUTION: In the method for opening/closing the molten metal tapping hole 1 in a metallurgical furnace for melting raw materials, such as ore, a core metal rod 2 is used as a spindle and a mud material 3 having a cross sectional shape a little larger than that of the molten metal tapping hole, is formed as a columnar shape around the core metal rod, and the molten metal tapping hole is closed by driving in the mud material together with the above core metal rod and desirably, the molten metal tapping hole is opened by pulling out the driven-in core metal rod together with the above mud material from the mud material. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an opening / closing device for opening and closing a tap of a metallurgical furnace for melting raw materials such as ores. Specifically, for example, it relates to a method for opening and closing a tap hole from a blast furnace or cupola that melts a raw material such as iron ore, or a tap hole of a metallurgical furnace body such as an electric furnace or a hot water storage container or a sump part of a gutter. .

[0002]

2. Description of the Related Art The tap hole of a metallurgical furnace facility such as a blast furnace needs to be opened and closed in order to extract the molten metal stored therein in a timely manner. Conventionally, a mud gun has been used to close the tap hole, and a clay-like plugging material has been filled and pressed into the tap hole to close the tap hole. The plugging material that is filled and press-fitted is baked and solidified in the tap hole by the heat of the surrounding area. An opening machine was used to open the tap hole, and the plugging material solidified by firing was drilled from the outside by a drill. As another method of opening the tap hole, immediately after the mud gun is closed, the gold rod is driven into the unfired plugging material by the hole opening machine, and at the time of the next hole opening, the end of the gold bar is grasped by the hole opening machine. The method of pulling it out was taken.

However, such a conventional method is
It required two devices, a mud gun and a perforator. The mud gun was a large hydraulic piston type, required a high-pressure hydraulic device and hydraulic piping, and required a strong foundation to support the reaction force during mud filling. Further, the boring machine drives the boring drill forward and along with the tap hole while rotating and hitting the boring drill with a pneumatic or hydraulic drifter. Furthermore, since both the mud gun and the hole punching device are arranged in the vicinity of the tap opening, the area around the tap opening is extremely complicated, and difficult work is required during construction and maintenance.

For example, FIGS. 5 and 6 exemplify planar equipment arrangements at the time of blockage and at the time of opening in the conventional method.
FIG. 5 shows a state in which the tap hole is closed by the mud gun 13, and FIG. 6 shows a state in which the punching machine 14 opens the tap port. Thus, in the past, the Mad Gun 1
Two devices, the No. 3 and the perforator 14, were required, and the equipment cost and installation space therefor were required. As an apparatus combining a mud gun and an opening machine, Japanese Patent Laid-Open No. 57-12
Japanese Patent No. 0613 discloses a method for quickly and safely carrying out work for closing a tap hole in an emergency by installing a current mud container detachably around the tip of a gold rod to be inserted into the tap hole of a blast furnace. It is disclosed. But with this method,
Since it is difficult to fill the inside of the tap with mud, the mud is not sufficiently closed, and the work and the device for putting the plugging agent into the mud container are required.

[0005]

SUMMARY OF THE INVENTION The present invention solves the problems of the prior art as described above, and a method for opening and closing a tap, which has the functions of both opening and closing the tap with a single device. Another object is to provide a switchgear.

[0006]

SUMMARY OF THE INVENTION According to the present invention, when closed, a mud material formed into a columnar shape having a cross-sectional shape slightly larger than the cross-sectional shape of the tap hole around the core bar is used as a shaft to drive the tap hole together with the core bar. The present invention provides a method for opening and closing a tap hole for a metallurgical furnace, which is characterized in that the tap hole is opened by pulling out only the core bar when the hole is opened. The following contents are as described in the range.

(1) In a method of opening and closing a tap hole of a metallurgical furnace for melting a raw material such as ore, a mud having a cored bar as a shaft and having a sectional shape slightly larger than the sectional shape of the tap hole around the cored bar. A method for opening and closing a tap for a metallurgical furnace, which comprises forming a rod into a columnar shape, and driving the mud rod together with the core bar to close the tap. (2) The method for opening and closing the tap hole for a metallurgical furnace according to (1), wherein the tap hole is opened by pulling out a cored bar that has been punched together with the mud member from the mud material. (3) In the apparatus for implementing the method for opening and closing the tap for a metallurgical furnace according to (1) or (2), when the tap is closed,
A cored bar formed by molding a mud material into a columnar shape is arranged coaxially with the extension line of the tap hole, and the cored bar is driven into the tap hole to close it, and when the tap hole is opened, the core bar is removed from the mud material. An opening / closing device for a tap hole for a metallurgical furnace, which has means for pulling it out to open a hole.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. Figure 1
Shows a state immediately before the outlet tap is closed in the present invention. In FIG. 1, a cored bar (2) is formed around a metal cored bar (2) as an axis, around which a mud material (3) formed in a columnar shape having a slightly larger cross-section due to the inner diameter of the tap hole (1) is formed. The state when arrange | positioned on the extension line of a tap (1) is shown. The cored bar (2) is fastened at its end to the drifter (4) through the attachment / detachment jig (6), and is driven along the guide rail (7) by the carriage (5) supporting the drifter (4). 8) Move forward coaxially with the tap (1). The cored bar (2) has an intermediate support part (9) and a tip support part (10) to prevent the cored bar (2) from bending due to its own weight and the weight of the mud material (3). The guide rail (7) is suspended from the tip of the swing arm (11) by a suspending tool (12).

The swivel arm (11) has a function of arranging the opening / closing device in front of the tap hole (1) and retracting it.
In this example, it is a swivel type, but it may be a parallel type.
FIG. 2 shows a state immediately after the outlet of the present invention is closed. In FIG. 2, the drifter (4) and the trolley (5) are advanced to the front end of the guide rail (7), and the cored bar (2) around which the mud material (3) is formed is inserted into the tap hole (1). It shows the state when the tap hole is closed by driving into. The tip of the mud material (3) may be tapered so as to have a guiding function in the initial stage of driving into the tap hole. The cross-sectional shape of the mud material (3) may be a circle slightly larger than the inner diameter of the tap hole, an elliptical shape, or a raindrop shape. The outer diameter of the mud material (3) is preferably +5 to 15% of the inner diameter of the tap hole.
This is because if the inner diameter of the tap hole is less than + 5%, the blockage of the tap hole becomes insufficient, and if it exceeds + 15%, it is difficult to press the mud material (3) into the tap port. Further, even when the mud material (3) has a circular cross section, its diameter may be changed along the center line. In addition, it is preferable to use a relatively soft mud material in the vicinity of the outer surface of the substantially cylindrical mud material (3) to facilitate driving into the tap hole.

FIG. 3 shows a state in which the tap hole in the present invention is being closed. In FIG. 3, the shaft of the drifter (4) is reversely rotated and retracted, whereby the fastening with the core bar (2) by the attachment / detachment jig (6) is released, and the drifter (4) retracts together with the guide rail (7). To do. The mud material (3) and the cored bar (2) remain in the tap (1). At the time of opening, the drifter (4) moves together with the guide rail (7) from the retracted position to the front of the tap hole, and the shaft of the drifter (4) moves forward and rotates forward to rotate the core bar ( The connection with 2) is made again. (Same condition as FIG. 2) Or when the next opening is near, the condition of FIG. FIG. 4 shows the state immediately after the opening of the tap hole in the present invention. In FIG. 4, when the drifter (4) retracts along the guide rail (7), only the core bar (2) is pulled out to open the tap hole. It is more effective to strike or rotate the core bar (2) with the drifter (4) during pulling out. While tapping continues, the inner diameter of the tap hole is gradually eroded and expanded by the molten metal, and when it is blocked,
It is in the state of.

[0011]

According to the present invention, it is possible to provide an opening / closing method and opening / closing device for a tap hole for a metallurgical furnace which have both functions of opening and closing the tap hole with a single device. Has the following notable industrially useful effects. 4) There is no need for a mud gun to close the sprue, nor is there a need for a high-pressure hydraulic system, hydraulic pipes, or a strong foundation. 5) The equipment cost can be significantly reduced compared to the case of installing both the conventional mud gun and hole puncher. 3) A work space required for equipment installation work and maintenance can be secured. 4) Prepare a cored bar with a mud material formed around it in advance, and mount it on a drifter with an automatic attachment / detachment device at the retracted position of the opening / closing device. And equipment is unnecessary.

[Brief description of drawings]

FIG. 1 shows a state immediately before a tap hole is closed in the present invention.

FIG. 2 shows a state immediately after the outlet of the present invention is closed.

FIG. 3 shows a state in which the tap hole in the present invention is being closed.

FIG. 4 shows the state immediately after the opening of the tap hole in the present invention.

FIG. 5 shows an example of a planar device arrangement at the time of blockage in the conventional method.

FIG. 6 shows an example of planar equipment arrangement at the time of opening in the conventional method.

[Explanation of symbols]

1: Exit gate 2: Core bar 3: Mud material 4: Drifter 5: trolley 6: Detachable jig 7: Guide rail 8: Drive device 9: Intermediate support part 10: Tip support 11: Revolving arm 12: Hanging tool 13: Mad Gun 14: Opening machine

Claims (3)

[Claims] 1. A method for opening and closing a tap hole of a metallurgical furnace for melting a raw material such as ore, the mud material having a cored bar as a shaft and having a cross-sectional shape slightly larger than the cross-sectional shape of the tap hole around the cored bar. Is formed into a columnar shape, and the mud material is driven together with the core bar to close the tap hole, thereby opening and closing the tap hole for a metallurgical furnace. 2. The method for opening and closing a tap hole for a metallurgical furnace according to claim 1, wherein the tap hole is opened by pulling out a cored bar that has been punched together with the mud member from the mud material. 3. An apparatus for carrying out the method for opening and closing a tap for a metallurgical furnace according to claim 1 or 2, wherein when the tap is closed, a cored bar formed by molding a mud material into a columnar shape is provided around the tap. Of the metallurgical furnace, which is arranged coaxially with the extension line of the core metal, has a means for driving the cored bar into the tap hole to close it, and at the time of opening the tap hole, pulling out the cored bar from the mud material to open the core bar. Opening / closing device for hot water outlet.