JPH02138408A - Method for repairing wearing metal fitting in blast furnace - Google Patents

Abstract

PURPOSE:To reduce fitting process and to execute repairing of wearing part of wearing metal fitting by forming a protecting liner to shallow V-shape, arranging connecting metal fitting to both sides thereof, inserting in a blast furnace and fixing this to iron shell in the blast furnace with a fitting chain. CONSTITUTION:The center part in width direction of the protecting liner 12 is formed to the shallow V-shape by bending so as to project to back face side. An inserting type project-shaped connecting metal fitting 12a having upward projection 12a' is arranged at one part of both sides on back face of the protecting liner 12 and a recess-shaped connecting metal fitting 12b having long hole 12b' is arranged at the other part. The projection 12a' of the project- shaped connecting metal fitting 12a and the long hole 12b' of the recess-shaped connecting metal fitting 12b are connected with an insertion and set along the inside of the wearing metal fitting 3. A supporting metal fitting 12c connecting a fitting chain 13 is arranged at upper end part of the protecting liner 12 and the fitting chain 13 is fitted to the iron shell in the blast furnace. The protecting liner 12 is supported by hanging down and set to the front face of the wearing metal fitting 3 or the refractory to execute the repairing.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for repairing wear ring metal fittings provided in the upper part of a blast furnace.

<Prior Art> When charging materials such as ore are charged into a blast furnace using a charging device, the charging materials collide with and are received by the inner surface of a wear ring provided at the upper part of the furnace. For this reason, the wear ring hardware is worn out due to the collision of the charge, and the wear is i!
! ! If unfolded, there is a risk of damage due to cracks etc. and falling off.

Wearing hardware in blast furnaces plays an important role in controlling the distribution of charged raw materials, and it is necessary to prevent the progression of wear. If the wear ring hardware becomes severely damaged, it will need to be replaced to protect the steel shell and refractories and maintain good furnace conditions.

There are two types of raw material charging equipment: a bell type and a rotating chute type, but both types are equipped with wear ring hardware, and damage due to wear is inevitable.

FIG. 7 shows an example of how the wear ring hardware is attached to the bell-type charging device. For charging raw materials, open the large bell 7 (
When being charged into the furnace via the armor plate 5 that controls the distribution of the charge, it collides with the wear ring hardware 3 and is then charged into the furnace.

The wear ring hardware 3 is a fixed type with an integral structure in which the wear-resistant hardware 3 is embedded in the refractory 3a, and as mentioned above, it gradually wears out due to the collision of charged raw materials, so it should be repaired when the damage due to wear has progressed. There is a need to.

Reference numeral 6 denotes a tube seat provided on the iron skin 1 at the top of the furnace, and the armor plate 5 is replaced through the opening of the tube seat 6. That is, the armor plate 5 is replaced by being hooked onto the end hook 14a of the chain 14 suspended from the hanging device 9 running on the armor plate replacement mole rail 8 provided above the tube seat 6.

By the way, as shown in Fig. 7, the wear ring hardware 3 embedded in the refractory 3a needs to be replaced in order to be repaired when wear progresses. In those that use input devices,
A separate removable wear ring that covers the inner surface of the refractories at the upper end of the refractories stacked on the inner surface of the iron shell of a blast furnace is disclosed, which can be replaced from outside the furnace.

<Problems to be Solved by the Invention> It is not easy to repair the fixed wear ring hardware, which is an integral structure in which wear-resistant hardware is embedded in the refractory shown in FIG. Replacing a ring with hardware costs a lot of money and time.

For this reason, a method is generally adopted in which a separate protective liner is attached to the front surface of the wearable metal piece embedded in the refractory material, in accordance with the method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 55-8940.

However, when installing the protective liner, the attachment chain connected to the upper part of the protective liner can be supported by the blast furnace shell along the top surface of the wear ring hardware, but the attachment chain connected to the lower part of the protective liner can be supported by the blast furnace shell. It is necessary to drill a hole in the bottom of the ring hardware and support it on the blast furnace shell through this hole.

However, since the material of wear ring hardware is generally ductile cast iron or heat-resistant and wear-resistant cast iron, drilling the holes is extremely difficult and not only increases the construction cost, but also requires a blast furnace structure for drilling the holes. Therefore, there is a problem that losses due to production cuts are also large.

The present invention solves the above-mentioned conventional problems and provides a method for installing a protective liner without making holes in the wear ring hardware or the back refractory when installing the protective liner, and therefore without requiring a mounting chain at the bottom of the protective liner. The purpose is to provide the following.

<Means for Solving the Problems> To achieve the above object, the present invention provides a protective liner on the front surface of the fixed wear ring hardware of a blast furnace or on the front surface of the refractory after the replaceable wear ring hardware is scattered. In the method for repairing blast furnace wear ring metal fittings, the central part of the protective liner in the width direction is bent vertically so as to protrude toward the rear side to form a dogleg shape, and the lower rear side of the protective liner is Plug-in convex connecting hardware and concave connecting hardware are provided on both sides, and the protective liner provided with the convex connecting hardware and concave connecting hardware is taken into the blast furnace via an armor plate replacement asset provided at the top of the blast furnace. In the blast furnace, the protective liners are placed adjacent to each other, and the convex and concave connecting hardware are sequentially connected and integrated by insertion, and the mounting chain connected to the supporting hardware provided at the upper end of each protective liner is attached to the blast furnace shell. By fixing the protective liner to the mounting chain, the protective liner is suspended and supported by the mounting chain, and the protective liner is disposed on the front surface of the fixed wear ring hardware or refractory for repair.

In addition, the present invention provides plate-shaped metal fittings that do not protrude toward the adjacent protective liner on both sides of the lower back side of the protective liner, instead of providing the plug-in convex connecting metal fittings and the concave connecting metal fittings on both sides of the lower back side of the protective liner. A protective liner provided with sheet metal objects is taken into the blast furnace via an armor plate asset provided at the top of the blast furnace, and the protective liners are placed adjacent to each other in the blast furnace, and the sheet metal objects are placed over the back surfaces of the adjacent protective liners. The protective liner is suspended and supported by the chain by fixing a mounting chain connected to the supporting hardware provided at the upper end of each of the protective liners to the blast furnace shell. It can also be repaired by placing a protective liner in front of it.

Hereinafter, the configuration of the present invention will be explained based on the drawings.

FIGS. 1(a), 1(b), and 1(C) show the structure of a protective liner used in the method for repairing wear ring hardware of a blast furnace according to the present invention.

The protective liner 12 is formed into a dogleg shape by bending the center portion in the width direction so as to extend vertically toward the rear side. And upward protrusions 12 are provided on one of both sides of the back surface of the protective liner 12.
A plug-in type convex connecting metal fitting 12a having a diameter a' and a concave connecting metal fitting 12b having an elongated hole 12b' are provided on the other side, and the protrusion 123' of the convex connecting metal fitting 12a of the adjacent maintenance AM liner 12 is connected in a concave manner. The elongated holes 12b' of the hardware 12b are successively connected by insertion and installed along the inner surface of the wear ring hardware 3.

At the upper end of the protective liner 12, there is a supporting hardware 12c connected to the chain 13, and a hanging bead 12d.
is the provision.

FIGS. 2(a), 2(b), and 2(C) show other structures of the protective liner used in the wear ring hardware repair method of the present invention. The protective liner shown in Figure 1! In place of the plug-in convex connecting metal fittings 12a and concave connecting metal fittings 12b provided on both sides of the lower surface of the protective liner 12, in FIG. It was established.

The other structure is the same as that shown in FIG.
Figures (a), (b), (As shown in C1, the plate-shaped hardware 2
0 overlaps the back surface of the adjacent protective liner 12, and is shifted in the height direction so as not to interfere with the plate metal fittings 20 of the adjacent protective liner 112, and is fixed by the port 20a. ing.

First, a method for repairing wear ring metal fittings in a blast furnace using a protective liner 12 having the structure shown in FIGS. 1(a), 1(b), and 1(c) will be described.

In FIGS. 3 and 4, reference numeral 10 denotes a shell opening through which a mounting chain 13 for fixing the protective liner 12 to the blast furnace shell 1 passes. In addition, 11 is a hardware for fixing the mounting chain 13 to the blast furnace shell 1.
11b is a blind flange for fixing the mounting chain 13 by welding or the like, and 11C is a gas seal cover.

12 is a protective liner that protects the worn parts of the wear ring hardware 3. 12a is a convex connecting hardware, 12b is a concave connecting hardware, 12c is a supporting hardware for supporting the weight of the protective 8W liner 12 on the upper surface of the wear ring hardware 3 and at the same time attaching the mounting chain 13, 12d is an installation work for the protective liner 12. It is a hanging piece for.

FIG. 3 shows a state in which the protective sleeve 12 is suspended by the hanging chain 14 to the worn part of the wear ring hardware 3, and after being taken into the furnace in this way, the
As shown in the figure, the convex connecting metal fittings 12a and the concave connecting metal fittings 12b attached to the side surfaces of each protective liner 12 are connected to the convex connecting metal fittings 12a and concave connecting metal fittings 12b of each protective liner 12.
are connected in sequence.

Then, the protective liner 12 goes around the furnace once, and the protective liner 12 having the convex connecting metal fittings 12b installed on both sides is finally installed on the protective liner 12 having the convex connecting metal fittings 2a installed first, and the protective liner 12 having the concave connecting metal fittings 12b installed on both sides to the hanging piece 12d. The series of connection operations is completed by suspending the liner with the connected hanging chain 14 and connecting the concave connecting metal fittings 12a provided on both sides to the convex connecting metal fittings 12a of the protective liners 12 on both sides.

FIG. 4 shows the state in which the protective liner 12 is attached to the worn part of the wear ring hardware 3 in this way, and shows the mounting chain 13 connected to the support hardware 12C provided at the upper end of the protective liner 12 on the tube seat 11a. It is fixed and supported by the blind flange llb.

The convex connecting hardware 12a and the concave connecting hardware 12b are attached to both sides of the back of the protective liner 12 (the front surface of the worn part of the wear ring hardware 3). If this configuration is used, the charging material will collide with the connecting metal fittings, which will wear out and lose their connection function. Therefore, the protective liner 12
It is attached to the back of the

Since the protective liner 12 is formed into a dogleg shape by bending the widthwise central portion vertically and protruding toward the rear side, the rear central portion of the protective liner 12 is close to the front surface of the worn part of the wear ring hardware 3. Both end portions of the back surface are in a state where they are relatively separated from the wear ring hardware 3. For this reason, convex connecting hardware 12a and concave connecting hardware 12b are provided at the bottom of both ends of the back surface.
The protective liner 12 can be installed as close as possible to the wear ring hardware 3, which has significant undulations due to wear as a whole.

Next, in the method using the protective liner 12 having the structure shown in FIGS. 2(a), (b), and (C), it is sequentially introduced into the furnace according to the procedure explained according to FIGS. 3 and 4. As shown in FIGS. 2(a), ΦG, and (C), a protective liner 12 is disposed in front of the worn part of the wear ring hardware 3. As shown in FIGS.

In this case, the vi-closing hardware 20 provided on both sides of the lower back of the protective liner is l! It is possible to install it by a relatively simple operation of arranging it in an overlapping manner on the back side of the protective liner that is in contact with J.

<Example> Embodiments of the present invention will be described below based on the drawings.

5 and 6 show an example of installing the protective liner 12. FIG. The opening for introducing the protective liner 12 into the blast furnace utilizes an armor plate replacement asset 6 that is generally provided for replacing the armor plate 5. The number of armor plate replacement assets 6 starts from 8! The protective liner 12 is divided into about 24 pieces because the size of the opening is about 450 mm in width and about 1,500 seconds in length.

In the embodiment, the protective liner 12 divided into 24 parts is divided into 12 parts.
The case where the armor plate is taken in from the armor plate replacement assets 6 will be explained.

The protective liner 12 is taken in by a hanging device 9 such as an electric chain block set on the armor plate replacement molar rail 8.The hook 14a at the end of the hanging chain 14 of the hanging device r11.9 is connected to the bead on which the protective liner 12 is suspended. 12d, the protective liner 12 is sequentially taken into the blast furnace by passing through the opening of the armor plate replacement asset 6.

In this case, since there are 12 armor plate replacement assets 6 and 24 protective liners 12, a hanging chain is attached to the protective liner 12 installed directly below the armor plate replacement asset 6. The number of hanging chains 14 is one, and the number of hanging chains 14 is two for the protective liner 12 installed outside the range of the armor plate replacement pipe seat 6.

FIG. 5 shows the state in which the protective liner 12 has been connected with the convex and concave connecting metal fittings 12a and 12b, respectively, and the state in which five protective liners are taken in at the final stage. each protective liner 12
Convex and concave connecting hardware 12a s 12 b attached to
For attachment, the first protective liner 12 is attached with convex connecting metal fittings 12a on both sides, and the protective liner 12 to be taken in last is attached with concave connecting metal fittings 12a on both sides.

In addition, two types of concave-convex connecting hardware 12a and 12b are attached.

What is shown on the right half side in FIG. 6 is the protective liner 12.
This is a plan view showing a state in which a total of 24 pieces are temporarily connected directly below the armor plate replacement asset 6 using a series of convex 4jl metal fittings 12a and a concave connecting metal fitting 12b (corresponding to the state shown in the cross-sectional view of FIG. 3). . After this temporary connection, insert a key rod (not shown) or the like into the attachment chain 13 hanging from the back of the protective liner 12 through the tube seat 11a and the iron shell opening IO, and hook the attachment chain 13 through the iron shell opening 10 and Pipe seat 11a
pull out from

Furthermore, a hole is made in the blind flange llb through which the mounting chain 13 passes, and after passing the blind flange llb through the pulled out mounting chain 13 and setting the blind flange llb on the tube seat 11a, remove it (=J chain 13 into the chain block (not shown) or the like and a hanging operation of the hanging chain 14, all the protective liners 12 are simultaneously set in the normal position (corresponding to the state shown in the cross-sectional view of FIG. 4).

After that, fix the mounting chain 13 to the growth flange llb by welding or the like, set the gas seal river cover 11c to Qn, and connect the three flanges: the pipe seat 11a, the blind flange 11b, and the gas seal cover C with bolts and nands. .

In FIG. 6, the radial position of the protective liner I2 in the temporarily connected state shown on the right half side and the radial position where the protective liner 12 is normally placed on the front surface of the wear ring hardware 3 shown on the right half side are −m Since the total length is approximately 300 holes, the hole drilled in the concave connecting hardware 12b is approximately 80 long holes 1 in the circumferential direction.
2b', and even if the diameter is expanded from the temporarily connected state to the position where the protective liner 12 is normally set, the elongated hole 12b' of the concave connecting metal fitting 12b and the protrusion 12a' of the convex connecting metal fitting 12a will not meet at the uneven connecting part. It is made so that it can slide in the circumferential direction.

As another embodiment in which the protective liner 12 is taken into the blast furnace and connected, for example, 6 of the 24 protective liners in the circumferential direction
It is also possible to set four blocks of protective liners connected and integrated as LTL sheets in an independent state.

In this case, in order to connect the first of the six protective liners with the second, a convex connecting metal fitting 12a is attached only to one side.
In order to connect the 6th block with the 5th block, a concave connecting hardware 12b is attached to only one side of the block, and there is no connecting hardware between each block, so there is no connecting hardware between the blocks.

In this way, there is a problem of flapping because not all of them are connected, but it has the advantage that it can be installed separately and the number of hanging devices can be reduced. 6 As another example to eliminate the above flapping, there is a problem of flapping. Four blocks of protective liners are made by connecting the protective liners as a set, and convex connecting metal fittings are arranged at both ends of each block. Then, a protective liner provided with concave connecting hardware on both sides can be connected and integrated between each block, similar to the protective liner that is taken in last as shown in FIG.

In the above embodiment, the protective liner 12 is provided on the 171 side of the wear ring metal piece, which has an integral structure in which the metal piece 3b is embedded in the refractory material 3a. It can also be applied to those equipped with replaceable wear ring hardware.

In this case, after removing the replaceable wear ring hardware, a protective liner is placed in the same way on the front of the refractory, and the second part of the protective liner protects the top surface of the refractory. It is preferable to have a bent shape.

In the above embodiment, a protective liner provided with convex and concave connecting metal fittings was described, but a protective liner provided with plate-shaped metal fittings 20 as shown in FIGS. 2(a), (b), and (C) was also described. For those that use the liner 12, the above-mentioned connection work is simply unnecessary, and the entire hardware 20 of the adjacent protective liner 12 is overlapped and the front side of the fixed wear ring hardware or the replaceable wear ring is connected in the same way. It is possible to repair by placing it in front of the refractory after the metal has been removed. In this case, the bonding of the protective liner is somewhat poorer than that of FIG. 1, but the repair work is easier.

<Effects of the Invention> Since the present invention is configured as described above, it is possible to reduce the closure of the steel shell when the protective liner is fixedly attached to the blast furnace steel shell, and there is no need to drill holes in the wear ring hardware or refractory material. Installation man-hours can be significantly reduced.

In addition, it is possible to reduce the number of wind breaks required for installation work and shorten the wind break time, resulting in the effect that the worn parts of the wear ring metal parts can be repaired with minimal impact on blast furnace operation.

[Brief explanation of the drawing]

FIG. 1 shows the structure of the protective liner according to the method of the invention,
(a) is a front view, (b) is a cross-sectional view taken along the line A-A in the front view (a), (C) is a cross-sectional view taken along the line B-B in the front view (a), and The figures show the structure of another protective container according to the method of the present invention, in which (a) is a front view, (b) is a sectional view taken along arrow A-A in front view (a), and (C) is a front view. Figure (B- of al.
3 and 4 are sectional views showing how the protective liner of the present invention is installed. FIG. 5 is an explanatory view showing the installation procedure of the protective liner of the present invention. Plan view showing the state of temporary connection and permanent connection of the protective liner of the invention, No. 7
The figure is a sectional view showing a conventional example. 1...Blast furnace shell, 3...Wearing hardware, 5...Armor plate, 6...Asset for armor plate replacement, 8...Mole rail for armor plate replacement, 9...Hanging Device, lla...Pipe seat, 12...Protective liner, 12a...Convex connecting hardware, 12b...
・Concave connecting hardware, 12c...Supporting hardware, 12d...
・Hanging bead, 13...Mounting chain, 14...
Hanging chain, 20...Plate hardware. Patent Applicant Kawasaki Steel Corporation Figure 1 <C> Figure 2 (O) Figure 1 (Q) Figure 1 (b) Cb) <C> Figure Figure Figure Figure Figure

Claims (1)

[Claims] 1. Repair of blast furnace wear ring hardware by arranging a protective liner on the front surface of the fixed wear ring hardware of a blast furnace or on the front of the refractory after the replaceable wear ring hardware has been thrown away. In the method, the widthwise central portion of the protective liner is bent vertically so as to protrude toward the rear side to form a dogleg shape, and insertable convex connecting metal fittings and concave connecting metal fittings are provided on both sides of the lower back side of the protective liner. The protective liner provided with the convex connecting metal fittings and the concave connecting metal fittings is taken into the blast furnace through an armor plate replacement tube seat provided at the top of the blast furnace, and the protective liner is placed adjacent to the convex liner in the blast furnace. The protective liner is connected to the mounting chain by sequentially connecting and integrating the shaped connecting hardware and the concave connecting hardware by insertion, and fixing the mounting chain connected to the support hardware provided at the upper end of each protective liner to the blast furnace shell. A method for repairing blast furnace wear ring metal fittings, which is characterized in that a protective liner is placed on the front surface of fixed wear ring metal fittings or refractories that are suspended and supported by the refractory. 2. Instead of providing plug-in convex and concave connecting hardware on both sides of the lower back of the protective liner, plate-shaped metal fittings are provided on both sides of the lower back of the protective liner that protrude in the direction of the adjacent protective liner, and the plate-shaped metal fittings The protective liner provided with the protective liner is taken into the blast furnace through an armor plate asset provided at the top of the blast furnace, and the protective liner is placed adjacent to the metal plate in the blast furnace so that the metal plate overlaps the back surface of the adjacent protective liner. 2. The method of claim 1, wherein a mounting chain connected to support hardware provided at the upper end of each protective liner is secured to the blast furnace shell.