JPH10153390A - Metal anchor for indeterminate refractories - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fatigue fracture of an anchor by employing an X-shaped or reverse Y-shaped metal anchor having a plurality of leg parts thereby eliminating concentration of stress at the joint of the anchor to a boiler due to oscillation phenomenon. SOLUTION: Two sets of Z-shaped anchors are welded in combination at an obtuse angle to produce an X-shaped 3 anchor or only the leg parts are welded to produce a Y-shaped anchor. Angle at the head part of the anchor is preferably set at 45 deg. or less with respect to a normal to the boiler surface, the open angle at a plurality of leg parts is set at 60-30 deg., the ratio of length between the head part of the anchor and the leg part is set at 1/2-2/1 and anchors of different shape or length may be employed in combination. The leg parts are basically opened in the rotational direction when the anchor is fixed. When the anchor is employed at mouth of cement rotary kiln, service life of a castable refractories can be prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal anchor used for holding an amorphous refractory to be applied to a furnace wall of a kiln.

[0002]

2. Description of the Related Art The design of metal anchors is to maintain the operating temperature such as anchor material, shape (V-shape, Y-shape, Z-shape and their variants), length, thickness, anchor density and irregular shaped refractories. The strength is determined as a standard, and these factors are determined in consideration of the safety factor. When the can body itself performs operations such as rotation in a rotary kiln or the like, consideration is usually given to increasing the safety coefficient.

[0003]

In order to extend the service life of irregular shaped refractories used for furnace walls of such kilns,
The characteristics required of the refractory itself include, in addition to heat resistance,
Something that is strong enough to withstand repetitive stress can be achieved. However, the increase in the strength of the amorphous refractory promotes the concentration of stress on the joint of the anchor with the can body,
Due to excessive mechanical stress, the anchor was cut from the joint, and the irregular-shaped refractory could fall off.

[0004]

Means and Action for Solving the Problems A 6- to 16-mm diameter Y-shaped and double Y-shaped (two-stage Y-shaped) metal anchor used at the mouth of a cement rotary kiln and cut at the joint with the can body. Investigation of the damage situation revealed that the main factor was metal fatigue caused by repeated stress.

[0005] Based on these results, the strengthening of the anchor system is examined, and the shape of the metal anchor is X-shaped or inverted Y-shaped, and by using a plurality of legs, the joint of the anchor to the can body due to the swinging phenomenon can be formed. It was found that the stress concentration of the anchor could be eliminated and the fatigue fracture of the anchor could be prevented.

[0006] The fact that the conventional anchor breaks due to swinging indicates that the irregular refractory being constructed is also moving, and the irregular refractory itself is damaged by the mutual stress due to this movement. . By using the anchor of the present invention to reduce the swing of the anchor,
This reduces the stress applied to the constructed refractory and has the effect of reducing damage.

The size of the anchor is preferably a round bar having a diameter of 6 to 20 mm, and the method of fixing the anchor to the can body may be welding or bolting conventionally used.

Regarding the shape of the anchor, it is preferable that the angle of the Z-shaped anchor is obtuse and the two are combined and welded to form an X-shape or that only the legs are welded to form an inverted Y-shape. Further, one of the X-shaped heads, which is an intermediate shape between them, may be longer and the other may be shorter. Further, the leg may be additionally welded to the conventional anchor.

The angle of the anchor and the ratio of the length of the head and the leg of the anchor need to be changed depending on the construction conditions, etc., and are not particularly limited. It is desirable that the angle between the plurality of legs is 45 ° or less with respect to the vertical line, the opening angle of the plurality of legs is 60 ° to 30 °, and the ratio of the length of the anchor head to the length of the leg is 1/2 to 2/1.

When the anchor of the present invention is used, it can be used in combination with V-shaped, Y-shaped, and Z-shaped conventionally used anchors and their modified shapes. It is also possible to use different anchors in combination. Next, the opening direction of the legs when the anchor is attached is basically based on a state in which the legs are expanded in the rotation direction. However, since the stress direction in the actual furnace is not always constant, an offset angle may be given to the opening direction of the legs, and a combination in which the opening directions of the legs are changed may be used.

[0011]

【Example】

FIG. 1 shows an example of an X-shaped anchor created by the present invention.

[0012]

[Fig. 1]

FIG. 2

FIG. 3 shows a combination of the Z-shaped anchors shown in FIG. 3, and the contacts between the anchors are fixed by welding. These anchors

As shown in Fig. 4, when used at the mouth of a cement rotary kiln, a low-cement castable with a heat-resistant temperature of 1700 ° C was applied to a thickness of 300 mm and used twice as long as the conventional 6-month durability. Endurance was obtained.

By using the metal anchor of the present invention at the mouth of a cement rotary kiln, the service life of the castable refractory that has been constructed can be extended.

[0013]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an X-shaped anchor.

FIG. 2 is a cross-sectional view of a Z-shaped anchor (1).

FIG. 3 is a cross-sectional view of a Z-shaped anchor (2).

FIG. 4 is a plan view of an example in which X-shaped anchors are arranged at the mouth of a cement rotary kiln.

FIG. 5 is a cross-sectional view of an example in which an X-shaped anchor is used in a mouth portion of a cement rotary kiln.

[Explanation of symbols]

 1 Z-shaped anchor 2 Z-shaped anchor 3 X-shaped anchor 4 V-shaped anchor 5 Castable 6 Brick stop 7 Shell 8 Base T hardware 9 Brick for rotary kiln

Claims (2)

[Claims] 1. A metal anchor used for holding an amorphous refractory, wherein the joint with a can body has a plurality of legs. 2. A construction method and a construction body for an amorphous refractory using the metal anchor according to claim 1.