JPH0610290B2 - Blast furnace dismantling method - Google Patents

Description

The present invention relates to a blast furnace dismantling method for efficiently dismantling an aging blast furnace.

[Conventional technology]

The blast furnace is dismantled and refurbished regularly because the furnace material deteriorates with long-term use, but it is demanded that this dismantling and refurbishment work be done in a short time to improve operational efficiency. .

The hearth and wall of the blast furnace have a refractory structure mainly composed of fired refractory bricks.Because the hot metal remains in the furnace and remains as residual iron, it is necessary to dismantle and repair the blast furnace. The residual pig iron is cooled and solidified, but at the time of solidification, the residual pig iron has a high temperature (about 700 ° C) and a tensile strength of 2000 to 3000 Kg.
/ Cm ² , the compressive strength is more than that, it is very difficult to dismantle and remove.

For this reason, conventionally, blasting is used to dismantle the residual pig iron, but in order to make the blasting hole, the present situation is that the flame pigeon transformer is used to punch the residual pig iron while melting it. is there.

[Problems to be Solved by the Invention]

However, when the residual hot metal is melted by the flame of the jet etch, holes cannot be formed unless the hot metal is discharged, so it is necessary to make the drilling angle upward and let the hot metal flow out naturally. There are cases in which the blasting holes are limited in shape, and it is not possible to pierce the residual iron with a hole having an optimum angle for blasting.

In addition, the flame ejected from the jet entrance is extremely dangerous and causes a problem in workability.Because the residual pig iron is perforated while melting, it is not possible to obtain a uniform perforation diameter and straight holes are formed. Since it is difficult to pierce, there is a problem in that it takes time to load the blast and the blasting efficiency decreases.

The present invention provides a method for dismantling a blast furnace, which aims to solve such problems and to make it possible to disassemble the blast furnace with high efficiency by forming a blast hole with high accuracy.

[Means for Solving the Problems]

In order to achieve the above object, the method for disassembling a blast furnace of the present invention is a step of removing refractory forming the side wall of the blast furnace to expose residual iron accumulated and deposited on the bottom of the blast furnace, and cutting at the tip. A blast hole is drilled in the residual pig iron by rotating the drill body by using a piercing device in which a drill body having a bit is rotatably and longitudinally arranged on the elevation arm of a moving carriage. The step of blasting the explosive holes with explosives to destroy and dismantle the residual pig iron, and removing part of the outer periphery of the bottom refractory of the blast furnace. And the blasting of the residual iron with gunpowder and the removal of the refractory at the bottom are repeatedly performed.

[Action]

The refractory forming the side wall of the blast furnace is destroyed and removed by an appropriate means to expose the residual iron accumulated on the bottom of the blast furnace and the drill body with a cutting bit at the tip is moved to the elevation arm of the carriage. A piercing device is provided on the upper part so as to be rotatable and movable back and forth, and a blast hole is pierced in the residual pig iron by advancing while rotating the drill body, which is safe and efficient. The holes can be well drilled and the holes that are drilled are straight and have a constant diameter, so that all the holes are drilled uniformly and accurately.

Therefore, the blasting can be easily and surely loaded into the blasting hole, and the residual iron can be dismantled efficiently.

〔Example〕

Explaining the embodiments of the present invention with reference to the drawings, when dismantling an aging blast furnace (1), first, it was surrounded by an iron skin forming a furnace mouth, a furnace chest, a furnace belly, a bosh section, etc. The refractory brick structure was dismantled and removed by known means, and the refractory brick structure (1a) forming the lower side wall of the blast furnace was dismantled and removed in the same way, and the residual iron accumulated on the bottom of the blast furnace (2) ) Is exposed.

This residual pig iron (2) is appropriately cooled and solidified prior to dismantling.

Then, a blast hole (3) is bored in the residual iron (2) by a punching device (4).

This punching device (4) is, as shown in FIGS. 5 to 8,
A drill body (8) in which a movable table (7) is movably arranged back and forth on a guide (6) on a mounting frame (5), and a cutting bit (8a) is integrally provided at the tip of the movable table (7). This drill body (8) is rotatably supported by a rotary drive electric motor (9) installed on a moving table (7), and the rotary shaft of the electric motor (9) and the drill body (8). It is rotated via a belt that is stretched between the toothed pulley that is fixed to the rear end.

Further, the drill body (8) is formed hollow and is provided with a fluid supply hole (10) opening from the rear end face thereof to the tip of the cutting bit (8a).

Further, the drive mechanism of the moving table (7) is the same as the mounting frame (5).
The screw rod (11) is rotatably supported between the front and back of the
Screwing (11) through a screw hole (12) provided in the moving table (7) to rotate the screw rod (11) by a feed motor (13) installed on the rear end of the frame (5). The movable base (7) is screwed along the screw rod (11) so that the movable base (7) can be freely retracted.
A pair of left and right gripping pieces (14) (1) provided in the central space of (7)
(4) Half screw holes (12a) (12a) are formed on the facing surface of (4), and the screw holes (12) are formed by these half screw holes (12a) (12a), and these gripping pieces (14) Cylinders (15) and (15) mounted on the moving base (7) by pivotally connecting the upper ends of (14) to open and close.
Open and close by screwing onto the screw rod (11) in a detachable manner, and at the time of opening the cord (16) such as a chain whose one end is connected to the rear end face of the moving base (7) after the mounting frame (5). The quick-return mechanism of the movable table (7) is configured by being wound by a winding means provided at an appropriate place.

The punching device (4) configured as described above has a mounting frame.
(5) to the moving arm (18) of the moving carriage (17) such as a crawler carriage
It is installed and fixed on the top, and the movable carriage (17) is operated to operate the residual iron (2).
Move to the blast hole drilling position.

At that position, the tip bit (8a) of the drill body (8) is brought close to the surface of the residual iron (2), and the electric motors (9) and (13) are driven. (8) is residual iron
(2) The screw rod (11) is rotated by a feed motor (13) while rotating at a constant rotation speed suitable for cutting, and the screw rod (1
The movable table (7) screwed to the (1) via the gripping pieces (14) (14) advances and advances the cutting bit (8a) at a constant speed suitable for cutting the residual iron (2). Then, the remaining pig iron (2) is perforated.

During this drilling, the fluid supply hole (10) from the rear end of the drill body (8)
Supplying fluid such as high pressure air, pressure water or pressure oil to
The fluid is jetted into the hole from the tip of the cutting bit (8a), flows toward the hole opening side through the gap between the drill body (8) and the hole wall, and discharges the cutting dust from the hole.

When the blast hole (3) having a desired depth is formed in the residual iron (2), next,
Remove the drill body (8) from the hole.

In this case, the screw rod (11) is driven by the drive motor (13).
The movable table (7) may be retracted along the screw rod (11) by reversely rotating, but in order to retract it quickly,
After opening the gripping pieces (14) (14) with the cylinders (15) (15) and unscrewing the half screw holes (12a) (12a) from the screw rod (11), the cord (16) And pull back to slide the movable table (7) on the guide (6) and retract it.

Then, the rotary punching device is moved to the next punching position, and punching is performed again in the same manner as described above.

Thus, after the blast holes (3) having a desired depth are formed at a plurality of places in the residual pig iron (2), the explosive holes (3) are loaded with explosives. At this time, since the blast hole (3) is formed as a straight hole having a constant diameter over the entire length by the cutting bit (8a) of the drill body (8), the explosive charge can be loaded easily and accurately.

After loading the explosive, explode it and dismantle a part of the residual iron (2).

In parallel with the dismantling work of this residual pig iron (2) or continuously, a part of the bottom portion (1b) of the blast furnace (1) formed of refractory bricks is removed, and the remaining residual pig iron (2) is processed in the same manner as above. After the blast hole (3) has been drilled, the residual iron (2) is dismantled by blasting it with explosives.
The blast furnace is dismantled by repeatedly performing the blast of (2) and removal of the bottom refractory.

〔The invention's effect〕

As described above, according to the method for disassembling a blast furnace of the present invention, after removing the refractory forming the side wall of the blast furnace to expose the residual solid iron deposited and solidified at the bottom of the blast furnace, a cutting bit is provided at the tip. Using a drilling device in which the drill body having the drill body is rotatably and longitudinally arranged on the elevation arm of a movable carriage, the drill body is moved forward while being rotated to form a blast hole in the residual pig iron. Since the blasting hole is loaded with explosives and exploded to destroy and dismantle the residual iron, the mobile trolley is operated to safely blast with the drill despite the high-temperature work environment with a lot of dust. Holes can be drilled,
Moreover, since the drilling direction of the drill body with respect to the residual iron can be freely changed by operating the elevation arm of the moving carriage, it is possible to form a hole having an optimum angle for blasting. By rotating the body and moving it forward, a blast hole with a constant diameter and a straight and desired depth can be efficiently drilled.Therefore, the puncturing time can be shortened and the explosive loading operation into the blast hole can be performed smoothly and reliably. It is possible to dismantle the residual iron with good efficiency.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a simplified side view of a state in which residual iron is drilled, FIG. 2 is its plan view, and FIG.
The figure is a side view of a movable carriage equipped with a punching device, FIG. 4 is a simplified sectional view of a blast furnace, FIG.
The drawing is a plan view thereof, FIG. 7 is a vertical sectional front view, and FIG. 8 is a vertical sectional rear view. (1) …… Blast furnace, (2) …… Still iron, (3) …… Blasting hole, (4) …… Punching device, (5) …… Mounting frame, (6) …… Guide, (7)…
… Mobile platform, (8) …… drill body, (8a) …… cutting bit, (9)
(13) …… motor, (10) …… fluid supply hole, (16) …… cord.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yukio Ishizaka 2-19-1 Sanno, Yawatahigashi-ku, Kitakyushu, Fukuoka Prefecture Okumuragumi Kyushu Branch Co., Ltd. 19-1 Okumura Gumi Kyushu Branch (72) Inventor Chiharu Nishi 2-19 Sanno, Yawatahigashi-ku, Kitakyushu, Fukuoka 192-1 Okumura Gumi Kyushu Branch (72) Inventor Kocho Tatsuhiro Hachiman Higashi, Kitakyushu, Fukuoka 2-19-1 Sanno-ku, Okumuragumi Kyushu Branch

Claims (1)

[Claims] 1. The process of removing the refractory that forms the side wall of the blast furnace to expose the residual pig iron that has accumulated and solidified at the bottom of the blast furnace, and the drill body with a cutting bit at the tip can be rotated and moved back and forth on the elevation arm of the trolley. The step of forming a blast hole in the residual pig iron by rotating the drill body forward while rotating the drill body using It consists of the steps of destroying and dismantling the pig iron and the step of removing a part of the outer periphery of the bottom refractory of the blast furnace, and repeatedly performing the above-mentioned blasting hole, blasting of residual pig iron by explosive and removal of the bottom refractory Dismantling method of blast furnace characterized by.