JPS61153217A - Method for adjusting position to attach stave - Google Patents

Abstract

PURPOSE:To adjust easily the position of the front face of a stave by the size adjustment of a spacer and to bring the stave into uniform contact with the surface of a furnace wall brick by making freely adjustable the space for attaching of a shell and stave by means of the spacer. CONSTITUTION:A distance piece 17 and a fine adjustment liner 18 are inserted to the top end of a bolt 11 which is inserted into a bolt insertion hole 5 and projects above a bolt seat 3. The top end of the bolt 11 is inserted into a bolt through-hole 8 of the shell 2 in such a manner that the piece 17 and liner 18 are positioned in the hole 8. A washer 16 is fitted onto the bolt and a nut 12 is screwed thereto and is locked to fix the shell 2 and the stave 1. The space between the stave 1 and the shell 2 is first roughly adjusted by means of the piece 17 to position the front face B of the stave 1 near to the prescribed line L in the case of attaching the stave 1 to the shell 2. The position of the front face B of the stave 1 is so adjusted as to arrive at the line L and thereafter the nut 12 is screwed to the bolt 11 and is locked to fix the shell 2 and the stave 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a stave used for cooling the furnace body in a blast furnace, and more specifically to a method for adjusting the mounting position of the stave relative to the iron shell.

(Prior Art) A stave cooling method is used for cooling the furnace body, especially in large blast furnaces.

In this stave cooling method, a stave with a built-in cooling pipe is installed between the furnace shell and the furnace wall bricks, and the cooling medium flowing through the cooling pipe cools the furnace wall bricks in contact with the front surface of the stave. It is supposed to be done.

Therefore, in order to improve the cooling efficiency of the furnace wall bricks by this stave, the front surface B of the stave must be in uniform contact with the surface of the furnace wall bricks as shown in FIG.

An example of a conventional stave structure and an example of a structure for attaching an iron shell to a stave is shown in FIG. 2 of Japanese Patent Application Laid-Open No. 50-158208.

In this example, the stave 1 has a convex bolt seat 8 on the inner surface opposite to the iron skin 2, and has a large number of grooves 4 on the front surface B. A bolt insertion hole 5 is drilled through the cooling pipe 7, and a cooling pipe 7 whose both ends are protected by a protective pipe 6 is built in. On the other hand, as shown in FIG. 3, the steel shell 2 is provided with a bolt through hole 8 and a protection tube attachment hole 9, and a protection tube attachment portion 10 is provided therein.

In this way, when attaching the stave 1 to the steel shell 2, insert the bolt 11 into the bolt insertion hole 5 from the front side of the stave 1, and insert the tip of the bolt 11 into the bolt through hole 8 of the steel shell 2 so that it projects outside the steel shell 2. Screw the nuts 12 together and tighten them to tighten the iron skin 2.
and the stave 1 are fixed, and the protection tube 6 of the stave is inserted into the protection tube attachment hole 9 of the steel shell 2, and in the protection tube attachment part 10, airtightness is established between the outer periphery of the protection tube 6 and the protection tube attachment hole 9. The structure is such that it can be installed in such a way that it has

In this state, the furnace wall brickwork is formed such that the front surface B of the stave 1 comes into contact with the surface of the furnace wall bricks 18.

In the figure, 14 is a cap 15 for preventing gas leakage, which is an iron shell 2.
This is a refractory filled in the space between the stave 1 and the furnace wall bricks 18.

(Problems to be Solved by the Invention) Generally speaking, in such a stave mounting structure, ■ Errors in manufacturing dimensions of the stave ■ Dimensional errors due to errors in construction dimensions between the steel shell, furnace wall, and brick surface, etc. occurrence is unavoidable.

Therefore, if the stave is installed without considering this dimensional error, the dimension a from the steel shell to the front surface of the stave will be uneven and a step will occur as shown in FIG. 4(b).

If a step A occurs, the furnace wall brickwork cannot be done accurately and the brick wall lacks stability, so this step A is usually removed.
The area is filled with monolithic refractories, but when comparing cases of the same material, monolithic refractories have lower thermal conductivity than bricks, so uneven cooling occurs and the area is not uniform over the entire brick area of the furnace body. , and it becomes difficult to perform efficient cooling.

Therefore, as a result, the useful life of the furnace wall brickwork is shortened, and good furnace operating conditions cannot be maintained for a long period of time. and a method for adjusting the stave mounting position.

(Means for Solving the Problems) The present invention is characterized in that the dimension between the front surface of the steel shell and the stave can be adjusted when the stave is attached to the steel shell.

In other words, when fixing the stave to the shell of the blast furnace, a spacer is interposed between the shell and the stave, so that the distance between the shell and the stave can be adjusted, and the dimension from the shell to the front of the stave can be adjusted. This is a method for adjusting the mounting position of a stave, which is characterized by ensuring surface contact between the stave and the large object surface of the furnace wall.

The present invention will be explained below based on the embodiment shown in FIGS. 1(a) to 1(a).

The one shown in FIG. 1(a) is a case in which the stave 1 has a bolt seat 8, and a distance piece 17 and a fine adjustment liner 18 are used together as a spacer interposed between the steel shell 2 and the stave 1. be.

In this example, a distance piece 17 and a fine adjustment liner 18 are inserted into the tip of a bolt 11 that is inserted into a bolt insertion hole 5 and projects above a bolt seat 8, and the distance piece 17 and fine adjustment liner 18 are made of iron. Insert the tip of the bolt 11 into the bolt through hole 8 so that it is located in the bolt through hole 8 of the skin 2.

Fit the washer 16, screw the nut 12, and tighten it to fix the steel skin 2 and stave 1.

It has become.

A large number of distance piece 17% fine adjustment liners 18 used in this example are prepared in several different thicknesses, and when the stave 1 is attached to the steel skin 2 without using a spacer, the front surface B of the stave 1 is It may be made slightly thinner so as not to reach a predetermined line (for example, the furnace wall brick surface L) K.

When installing the stave 1 to the steel shell 2, first use the distance piece 17 to roughly adjust the distance between the steel shell 2 and the stave 1 to position the front surface B of the stave I near the predetermined line L, and then use the fine adjustment liner. 18 so that the front surface B of the stave 1 reaches a predetermined line L, the nut 12 is screwed onto the bolt 11 and tightened to fix the steel shell 2 and the stave 1.

That is, in this example, the distance between the steel shell 2 and the stave 1 is adjusted by adjusting the thickness of the distance piece 17 and the fine adjustment liner 18.

In the case shown in FIG. 1(b), the stave 1 does not have a bolt seat, and a hollow push-in bolt and a fine adjustment liner are used together as a spacer interposed between the steel shell 2 and the stave 1.

In this example, a push-in bolt support part 19 having a threaded part with a hollow push-in bolt is provided on the steel shell 2, and a hollow push-in bolt 20 is screwed into this push-in bolt support part 19 from the outside of the steel shell 2. This hollow push-in bolt 20 forms a bolt through hole 21 in the steel skin 2 part.

When attaching the stave 1 to the steel shell 2, adjust the threading position of the hollow push-in bolt 20 in advance so that the front surface of the stave 1 reaches a predetermined line, and insert the bolt 11 into the bolt insertion hole 5 from the front surface of the stave 1. The stave 1 is fixed to the steel shell 2 by making the tip of the hollow push-in bolt 20 protrude from the end face through the hollow part of the hollow push-in bolt 20, that is, the bolt through hole 21, fitting the washer 16, and screwing and tightening the nut 12. There is.

In this example, the distance between the steel shell 2 and the stave 1 is determined by changing the screwing position of the hollow push-in bolt 20.

However, if the lower end of the hollow push-in bolt 20 is not in contact with the stave 1, when tightening with the nut 12,
Since there is a possibility that the screwing position of the hollow push-in bolt 20 may deviate from the predetermined position, a fine adjustment liner 22 is interposed between the lower end of the hollow push-in bolt 20 and the stave 1 so that the position can be fixed. In the above, the hollow push-in bolt 20 is screwed into the push-in bolt support portion 19 provided on the iron skin 2, but it may also be screwed into the bolt 11.

The one shown in FIG. 1(e) is one in which the stave does not have a bolt seat, and a hollow push-in bolt is used as a spacer interposed between the steel shell 2 and the stave 1.

In this example, a support part 23 having a threaded part with a hollow push-in bolt is provided in the bolt insertion hole 5 of the stave 1, and a hollow push-in bolt 24 is inserted into the threaded part of the support part 28.
The hollow push-in bolt 24 is screwed together from above, and a bolt insertion hole 25 is formed in the hollow portion of the hollow push-in bolt 24 .

When attaching the stave 1 to the steel shell 2, adjust the threading position of the hollow push-in bolt 24 in advance so that the front surface B of the stave 1 reaches the specified line L, and insert it into the bolt insertion hole 5 from the front surface of the stave 1. The tip of the bolt 11 is inserted into the bolt through hole 8 of the steel shell 2 through the hollow part of the hollow push-in bolt 24, that is, the bolt insertion hole 25, and is caused to protrude above the steel shell 2.

At this time, the head end surface of the hollow push-in bolt 24 is in contact with the lower surface of the steel shell 2.

Then, a washer 16 is fitted to the tip of the bolt 11 protruding above the steel shell 2, a nut 12 is screwed on, and the stave 1 is fixed to the steel shell 2 by tightening it.

In this example, the distance between the steel shell 2 and the stave 1 is determined by changing the screwing position between the hollow push-in bolt 24 and the threaded part of the support part 23 of the stave 1, and between the head end surface of the hollow push-in bolt 240 and the upper surface of the stave 1. Adjust by adjusting the dimensions of.

In this example, the hollow push-in bolt 24 is connected to the stave 1.
Although it is designed to be screwed into a threaded part of a support part 28 provided at the upper part of the bolt insertion hole 5, it may be made to be threaded into a bolt 11.

The one shown in FIG. 1(d) is the one in which the stave 1 does not have a bolt seat, and a push-in bolt 26 as a spacer interposed between the steel shell 2 and the stave 1 is provided separately from the bolt insertion hole 5. It is adapted to be screwed into the insertion hole 27.

In this example, a push bolt insertion hole 27 is bored in the vicinity and upper part of the bolt insertion hole 5 of the stave 1, a support portion 28 having a threaded portion for the push bolt 26 is provided above the push bolt insertion hole 27, and the push bolt 26 is supported by the support portion 28. It is adapted to be screwed into the threaded portion of the portion 28.

When installing stave 1 to iron skin 2, use push bolt 26.
into the threaded part of the support part 28 from above the stave l,
After adjusting the screwing position, insert the bolt 11 from the front side of the stave 1 into the bolt hole 5, and insert the tip of the bolt 11 through the bolt hole 5 into the bolt hole 8 of the steel shell 2.
Make it protrude above the iron skin 2.

Here, the screwing position of the push-in bolt 26 is adjusted to adjust the distance between the steel shell 2 and the stave 1 so that the front surface B of the stave coincides with the predetermined line L.

Then, the washer 16 is fitted to the tip of the bolt 11 that protrudes above the iron skin 2, the nut 12 is screwed on, and this is tightened to fix the stave 1 to the iron skin 2. The spacing between the staves 1 is adjusted by changing the screwing position between the push-in bolt 26 and the screwing portion of the support portion 28.

In addition, in this example, push the bolt 26 into the stave 1.
Although it is designed to be screwed into the threaded part of the side support part 28,
A bearing part may be provided on the side of the steel shell 2, a threaded part may be provided in the bearing part with the steel shell 2, and the push bolt 26 may be screwed into this threaded part (Effect of the invention) In the present invention, the steel shell 2 When installing a stave in a furnace, the distance between the steel shell and the stave can be adjusted using a spacer.By adjusting the dimensions of this spacer, the position of the front of the stave can be easily adjusted, ensuring uniform contact with the brick surface of the furnace wall. can.

Therefore, the cooling efficiency of the furnace wall bricks is good, and the stability of the furnace wall brickwork is also good, so the useful life of the furnace wall brickwork is extended and good furnace operating conditions are ensured for a long period of time. Excellent effects can be obtained such as being able to

[Brief explanation of drawings]

FIGS. 1(a) to (a) are side sectional explanatory views showing various embodiments of the present invention, and FIG. 2 is a schematic explanatory view of a general stave (
Figure a) is a partially cutaway side view, and figure (b) is a front view. Figure 8 is a side cross-sectional explanatory diagram showing an example of a typical stave installation structure, Figure 4 is an explanatory diagram showing the positional relationship between the steel shell, the stave, and the brickwork of the furnace wall, and Figure (a) shows the ideal type. Explanatory diagram, (
b) The figure is an explanatory diagram showing a non-ideal type. 1... Stave 2... Iron shell 3... Bolt seat 4... Groove 5... Bolt insertion hole 6... Protection tube 7... Cooling pipe 8... Bolt through hole 11.・Bolt 1
2...Nut 13...Furnace wall brick 14...Gas leak prevention cap 17...Destance piece 18, 22...Fine adjustment liner 19...Pushing bolt support part 20, 24...・Hollow push-in bolt 21... Bolt through hole (hollow part) 28, 28... Support part 25... Bolt insertion hole (hollow part) 26... Push-in bolt 27... Push-in bolt insertion hole No. 44

Claims (1)

[Claims] When fixing a stave to the shell of a blast furnace, a spacer is interposed between the shell and the stave, so that the distance between the shell and the stave can be freely adjusted and the dimension from the shell to the front of the stave can be adjusted. A stave mounting position adjustment method characterized by ensuring contact between the front surface of the stave and the refractory surface of the furnace wall. (2) The stave mounting position adjusting method according to claim 1, wherein the spacer is dimensionally adjusted in advance. (3) The method for adjusting the mounting position of a stave according to claim 1, wherein the spacer is a screwed body, and the end position of the spacer can be adjusted by adjusting the screwing position.