JPH10238963A - Method of demolition of refractory lined in molten metal container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for wholly or partly demolishing a refractory line in a molten metal container with low noise. SOLUTION: There are disposed a powdered material constituting a cylindrical body in a molding die and a powder material provided around a peripheral edge thereof in a proper interval and containing diamonde whetstone powder constituting a tip part, and then they are sintered in the molded die by pressurizing them from the side thereof and heating them by supplying power, and providing a cutout in a refractory 18 using an integrally coupled diamonde wheel cutter 12 to bring it into such a state that a joint is brought artificially into vacancy or any crack is formed therein. Hereby, the refractory is separated and fallen off. Further, only a desired part is easily cut, and a cut end becomes clean so that even partial demolition only of a damaged refractory part is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for disassembling a refractory lined in a container for molten metal such as a ladle, a hot metal ladle and a tundish.

[0002]

2. Description of the Related Art A molten metal container is repaired or rebuilt periodically or when it is deemed necessary during inspection, and at the time of repair or rebuilding,
Refractory bricks or irregular refractories are dismantled only partially or entirely in damaged areas. Conventionally, such dismantling work of refractory lining has been performed using a crusher such as a breaker or a rock drill.

[0003]

The disintegration of refractory linings with a crusher produces loud noises such as impact sounds and operation sounds, and low-noise crushers have been developed. There is no difference in the method of crushing, and there is a limit to reducing the crushing sound. In addition, in the method using a crusher, the partial disassembly is not easy, and the crushed surface is not clean, so that it is not suitable for repairing only the refractory damaged portion.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for dismantling a refractory which is low in noise during dismantling and is suitable for partial repair.

[0005]

Accordingly, the present invention includes a wheel-shaped cutter for cutting concrete or the like, preferably a disk-shaped main body, and ultra-hard abrasive grains such as diamond, which are provided at regular intervals on the periphery of the main body. The tip and the tip are pressurized from different types of powdered material from the side, heated and energized, sintered in a mold, and cut into the refractory using a wheel-shaped cutter obtained by integrally joining. And separated and separated.

[0006] The refractory material lined in the molten metal container is constructed by joining bricks with a refractory mortar called a joint in the case of brickwork, and in the case of an irregular type refractory, by means of a joining crystal of an additive. It is joined and constructed, but with bricks, the joints will be missing, and if it is an irregular type refractory, cracking due to spalling will occur and the refractory in the molten metal container will fall off It has been known.

The present inventors have considered that the refractory may be dismantled by making a cut in the refractory with a cutter for cutting concrete or the like utilizing this phenomenon. It was thought that cutting would not be possible. However, when the present inventors tried cutting a refractory with a cutter for cutting concrete or the like on a trial basis, they found that cutting was possible. Found that cutting could be done without flying chips.

[0008] Refractories in which joints have been cut off or cracked due to cuts are particularly easy to peel off in the case of bricks, but if they do not peel off even if the cuts are made, they are hit with a breaker to peel off. Even in this case, do not crush, or if there is little crushing noise is low,
The time to generate loud noise is shortened. The cutter used in the present invention can be mounted on a grinder so that an operator can perform cutting. However, it is preferable that the cutter is mounted on a robot and the cutting is performed by the robot.

Among the robots, a rectangular coordinate robot having a linear motion mechanism in two or more directions, a cylindrical coordinate system robot having both linear and rotary motion mechanisms among linear motion mechanisms in the front-rear, left-right and vertical directions. , A vertical articulated robot, a horizontal articulated robot, or the like can be used.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The robot shown in FIGS.
Turntable 2 rotatably supported on base 1
A vertical feed screw 4 attached to a column 3 arranged side by side on a turntable; and a nut supported by the column 3 so as to be able to move up and down, screwed into the vertical feed screw 4 and raised and lowered by rotation of the vertical feed screw 4. (Not shown), and an arm 6 attached to the guide 5 so as to be slidable in the horizontal direction and moved forward and backward by a pinion rack mechanism (not shown). Feed screw 4,
A motor (not shown) for rotating and driving the vertical feed screw and a nut screwed to the vertical feed screw 4 constitute a vertical motion mechanism, and a pinion rack mechanism constitutes a horizontal motion mechanism.

As shown in FIGS. 3 and 4, a cutter receiving base 7 is pivotally supported at the tip of the arm 6 so as to swing.
A swinging motion can be performed by a swinging motor 8 via a speed reducer 9. A motor 11 is fixed to the cutter receiving base 7, and the diamond wheel cutter 12 is driven to rotate by the motor 11.

As the diamond wheel cutter 12, a known method as disclosed in Japanese Patent Application Laid-Open No. 7-224303, that is, a powder material forming a disk-shaped main body in a molding die and a peripheral portion thereof arranged at appropriate intervals. After placing the two types of powder materials comprising the powder material containing the diamond abrasive grains constituting the tip portion, pressurizing from the side, heating and energizing, and sintering in the molding die and simultaneously joining together What is obtained by this is used.

FIG. 5 shows a state in which the motor 14 is mounted on the cutter receiving base 7 which is swingably supported at the tip of the arm.
A cutter shaft 15 to which the diamond wheel cutter 12 is attached is supported, and the cutter shaft 15 is driven to rotate by a motor 14 by belt transmission. Pot 1
When dismantling the refractory 18 lined with the
Is set on the pan holder 19 in a horizontal position as shown in FIG. 1 or in a vertical position. Then, the robot is remotely operated or automatically controlled to move the arm 6 forward, put the cutter 12 in the pan, move up and down, turn the cutter 12, swing the cutter 12 to move the arm 6 forward and backward, and refractory 18
Make fine cuts all around. Thereby, the refractory is finely separated and peeled.

FIG. 6 shows another example of the robot.
Turntable 2 rotatably supported on base 21
A vertical multi-joint type robot 23 is attached to the arm 2, and the cutter receiving base 7 is mounted on the tip of the arm as described above, and the cutter receiving base 7 is provided with the cutter 12. Also in the case of the present embodiment, the arm 24 bends and extends and turns, so that the cut is made finely in the entire periphery of the refractory 18.

[0015]

According to the first aspect of the present invention, it is possible to cut even the refractory of the container for molten metal, and the cut is in the same state as the case where the cut is artificially dropped or a crack is generated. Things come off and fall off. In addition, the cut has less noise than crushing by a crusher, and it is easy to cut only a required part and a cut end is also clean, so that a partially disassembled body of only a damaged refractory part can be easily performed.

According to the second aspect of the present invention, the diamond chips do not easily fall off, and can be used for a long time. As in the third aspect of the invention, when a cut is made in a refractory made of bricks, the bricks are likely to fall off due to the protrusion. According to a fourth aspect of the present invention, when the cutting is performed using a robot, work in a poor working environment due to noise and dust can be saved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state when a cut is made in a pan by the method of the present invention.

FIG. 2 is a plan view of a robot used in the method shown in FIG.

FIG. 3 is a plan view of a device provided at an arm end of the robot.

FIG. 4 is a front view of the same device.

FIG. 5 is a plan view of another apparatus.

FIG. 6 is a diagram showing a state when a cut is made in a pot by another mode of the robot.

[Explanation of symbols]

1, 12, base 2, 22, turntable 3, support column 4, vertical feed screw 5, guide 6, arm 7, cutter holder 8, oscillating motor 9, reduction gear 11, 14. Motor 12. Diamond wheel cutter 15. Cutter shaft 17. Pot 18. Refractory 23. Vertical articulated robot

Claims (4)

[Claims] 1. A dismantling of a refractory lined in a container for molten metal, wherein the refractory is cut by making a cut into a refractory using a wheel-shaped cutter for cutting concrete or the like and separating and separating the refractory. Construction method. 2. A cutter comprising: a powder material forming a disk-shaped main body in a molding die; and a powder material containing diamond abrasive grains, which is disposed at an appropriate interval around the periphery thereof and forms a tip portion, is disposed. 2. The method for disassembling a refractory lined in a container for molten metal according to claim 1, wherein the refractory lined in the container for molten metal is pressurized from the side, heated by electricity, and sintered in the molding die while being integrally joined. 3. The method according to claim 1, which is applied to a refractory of brickwork.
Or a method for dismantling a refractory lined in a container for molten metal according to 2. 4. The method for disassembling a refractory lined in a container for molten metal according to claim 1, wherein the cutter is attached to a robot, and the cutting is performed by the robot.