JPS58141311A - Method and device for chipping in tapping spout of blast furnace - Google Patents

Abstract

PURPOSE:To remove desired amts. of refractories from the side walls of a tapping spout efficiently with consumption of inexpensive materials by blasting shot blasts through a nozzle facing the side walls of the tapping spout and moving the nozzle in the longitudinal, depth and width directions of the spout. CONSTITUTION:A carriage 1 is moved in the upper part of a tapping spout 24 up to the position of the part to be repaired on a rail along the spout. The height of a nozzle 4 is adjusted with a cylinder 16 and the horizontal position is adjusted with a cylinder 18. The wheels 22 of a hood 21 are brought into contact with the surface on the side wall 27 of the spout 24. A compressor 5 on the carriage 1 is then started and compressed air is fed to the nozzle 4 through a flexible pipe 9 and an L-shaped transport pipe 3; on the other hand, a valve 8 is opened to start injection of the shot materials 25 in a hopper 6, so that shot blasts are sprayed onto the wall 26. The nozzle position is adjusted by the cylinder 16 and the traveling of the carriage 1 in succession to the above, whereby the worn refractories are removed from the desired area to be repaired. The depth of the removal is adjustable as desired with the cylinder 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for removing the side wall of a tap trough, and more particularly to a method and apparatus for automatically removing worn refractories from the side wall when repairing a blast furnace tap trough. Regarding the device.

The outlet trough is a place where hot metal and slag from the blast furnace taphole are collected and separated, and this is where the surface of the trough is most severely eroded due to melting damage. Therefore, heat resistance, abrasion resistance, and impact resistance are required in terms of materials, and high-grade refractory materials containing high Stc and E3io2゜Al2O3 are used, making them extremely expensive2. . like this.

When repairing expensive refractories, it is important to remove only the eroded parts to a minimum to save the cost of refractories. There are two methods: removing the fireproofing material manually using a device such as an air breaker, and cutting it using a machine. The manual method creates a poor working environment and is undesirable from the viewpoint of safety and hygiene. Also, the method of using machines destroys the refractory material to unnecessary parts. In the past, work costs were high and satisfactory results could not be obtained due to reasons such as low work efficiency, rapid wear of blades, and large-scale equipment. The present invention aims to solve problems of this type that arise in previous operations of removing refractory material from tap runners.

The object of the present invention is to provide an economical method and apparatus for removing refractory materials from high-hardness, fine-grained materials such as short material obtained by processing converter slabs by blasting them at high speed onto the walls of tap troughs. It is possible to obtain.

According to the present invention, the L-shaped transport pipe is slidably attached to the horizontal lower end portion of the L-shaped transport pipe, which is suspended vertically and vertically from a truck running on a platform installed along and above the blast furnace tap trough. A shot nozzle is placed in a position facing the side wall of the tap runner, and shot is injected from the nozzle by shot material sent from a shot hopper on a truck to the nozzle through the transport pipe and compressed air injected into the transport pipe.・Blow the blast onto the side wall, and adjust the length of each nozzle taper,
A method is provided for removing the sidewalls of a tap trough, which is characterized by moving in the depth and width direction to scrape a desired amount of refractory from the sidewalls.

Further, according to the present invention, there is provided a bogie that runs on a track laid on a frame installed above the blast furnace tap trough, a rotating disk mounted horizontally on the bogie, and a rotating disk that can be raised and lowered from the disk. A telescopic shot transport pipe whose upper end is suspended and connected to a shot hopper on a trolley, and whose lower end is bent horizontally to form an L-shape, and can freely slide on the horizontally bent lower end of the transport pipe. A device for removing the side wall of a tap trough is obtained, which is characterized in that it comprises an injection nozzle attached to the pipe, and a compressed air supply pipe connected to the transport pipe.

Embodiments of the method and apparatus of the present invention will now be described with reference to the accompanying drawings.

Referring to FIG. 1, an apparatus 1O of the present invention is shown comprising a truck 1 running on a track 12 installed on a pedestal 11 along and above a tap trough 24. A traveling motor j30 is attached to the bogie l, and the wheels 1 on the track 12
It is designed to drive 3.

As shown in FIGS. 2 and 3, a rotating disk 2 is horizontally attached to the truck 1 via a bearing 19.

The rotating disk 2 has a toothed ring or an endless chain 15 on its outer periphery. Motor 20 for driving a disc attached to trolley 1
A gear ring 20G on the output shaft engages with the endless chain 15 to rotate the disc 2. A shot hopper 6 is attached to the disk 2 via a support 29. The shot hopper 6 holds shot (also called grid) material 25 made of granules rich in high hardness Keika (Keika) obtained by crushing the converter slab, and supplies it to the nozzle 4 shown below.L A transport pipe 3 having a letter-shaped telescope structure has its upper end connected to the lower end of the hopper 6 via a valve 8.The transport pipe 3 is slidably connected to the inner pipe 3A passing through the rotating disk 2. The outer tube 3B of the transport tube 3 is made up of an outer tube 3B that is fitted on the outside of the outer tube 3A, and is configured to be expandable and contractable in the vertical direction.Outer tube 3 of the transport tube 3
B has a horizontal portion 3c formed by bending the lower end 90 degrees. A suitable sealing material 27 is inserted between the outer periphery of the inner tube 3A and the inner periphery of the outer tube 3B forming a telescope structure.
ing. A protective tube 7 surrounding the upper half of the outer tube 3B hangs down from the lower surface of the rotating disk 2, and serves as a guide for the vertical movement of the outer tube 3B of the transport tube 3. The outer tube 3B has a roller 2 on the outer periphery of the upper end portion that rolls along the inner surface of the protective tube 7.
It has 8. The driving hydraulic cylinder 16 has an upper end attached to the protection tube 7 and a lower end connected to the enclosure 14 provided on the outer pipe 38 of the transport pipe 3. 14B shows a plunket attached to enclosure 14, and drive cylinder 1
Connect the lower end of 6 to the outer tube 3B.

Therefore, the outer tube 3B moves up and down as the hydraulic cylinder 16 expands and contracts. A nozzle 4 is fitted into a horizontal portion provided at the lower end of the outer tube 3B in the form of a sleeve.

The nozzle 4 is provided with a roller 17 at a portion fitted into the horizontal end of the outer tube 3B, and is configured to slide along the outer tube 3B in a telescopic manner. A driving hydraulic cylinder 18 has one end attached to the enclosure 14 and the opposite end fixed to the sleeve 4 to hold the nozzle 4 at a desired position relative to the outer tube 3B.

The nozzle 4 is provided with a hood 21 surrounding it at its tip.

The hood 21 includes a roller 22 that rolls along the wall 26 of the tap trough 24, and a curtain 23 that closes the gap between the outer peripheral edge of the hood 21 and the wall 26.

As shown in FIG. 1, a compressor 5 mounted on a truck 1 is connected to a transport pipe 3 through a flexible pipe 9,
Send compressed air to blow out the shot material. In use, the side wall 26 of the tap trough 24 to be repaired is cooled with water or air, and the cart 1 is mounted on the pedestal 11 with a crane. Next, the cart 1 is moved along the track 12' to the position of the repaired part, and the height of the nozzle 4 is adjusted by the drive cylinder 16, and the horizontal position is adjusted by the drive cylinder 18. Place the nozzle 4 in a position facing the surface of the refractory material. Then, the compressor 5 is started, the valve 8 is opened, and the injection of the shot material 25 is started to spray the shot blast onto the wall. Subsequently, the height of the nozzle 4 is adjusted by the driving cylinder 16 to increase the height of the nozzle 4 in the longitudinal direction of the tap runner 24.
When the position of the refractory material is adjusted by running the trolley L on the track 12, as shown in FIG. This depth can be adjusted as desired by the compressed air pressure and the short material 25.
The following values are considered to be appropriate for these conditions, although they are affected by the amount and particle size of the additive, the gap between the nozzle 4 and the surface of the refractory material, the moving speed of the nozzle, etc.

Nozzle movement speed 500~lOυυ-/m
As the in-shot material, it is desirable that the single particles have a large specific gravity and hardness and are angular. A method with specifications similar to the conventional method is considered suitable. As shown in the dimensions 3-5 true specific gravity 3.5, bulk specific gravity 1990 Ql/n5, and Shore hardness 90-95°, the present invention not only completely eliminates the conventional manual labor, but also improves the repair area. It is possible to precisely control and remove existing fireproofing materials to the minimum necessary, thereby reducing the cost of repair work. Another advantage of the present invention is that it utilizes inexpensive materials such as blast furnace and converter slag as consumable materials, thereby reusing resources.

[Brief Description of the Drawings] Fig. 1 is a perspective view of the device used in the present invention, and Fig. 2 is a perspective view of the device used in the present invention.
3 is an enlarged sectional view of the main parts of the device in FIG. 1, a perspective view showing the refractory material removal work performed using the device in FIG. 4, and 5. The figure is a sectional view taken along line V-V in FIG. 4. 1 Bogie 6 Hopper 7 Protective tube 11 Frame 12 Track 13 Wheels 16 Drive cylinder 20 Drive motor 21 Hood 22 Roller 28 Roller 29 Support column 30 Traveling motor

Claims (2)

[Claims] (1) An L-shaped transport pipe is suspended so that it can be raised and lowered from a trolley running on a platform installed above the taper along the blast furnace tap trough. The shot material is sent from the shot hopper on the truck to the nozzle through the transport pipe, and the shot material is injected from the nozzle by the compressed air injected into the transport pipe. A tap trough characterized in that a desired amount of refractory is scraped and warmed from the side wall by spraying plastic onto the side wall and moving the nozzle in the length, depth and width directions of each tap trough. A method of machining the side wall of. (2) A bogie that runs on a track installed on a pedestal along and above the blast furnace tap trough, a rotating disk mounted horizontally on the bogie, and a rotating disk that is suspended from the disk so that it can be raised and lowered. A telescopic shot transport pipe whose upper end is connected to a shot hopper on a trolley and whose lower end is bent horizontally to form an L-shape, and which is slidably attached to the horizontally bent lower end of the transport pipe. 1. A device for cutting the side wall of a tap trough, characterized in that it is equipped with an injection nozzle in which the iron is poured, and a compressed air supply pipe connected to a cocoon feed pipe.