JPH0519323Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an improvement in the lining structure of the hearth of an industrial furnace used in the steel industry, particularly a walking hearth heating furnace.

BACKGROUND ART Conventionally, as illustrated in the hearth portion of a walking hearth type heating furnace in FIG.
5 is piled up, and monolithic refractories 5 are installed on both sides of the portion in contact with the refractory locking hardware 7. The refractory locking fitting 7 consists of each side wall and a bottom surface, and the contact portion between the side wall and the monolithic refractory 5 is caused by the thermal expansion of the refractory locking fitting 7 itself and the monolithic refractory when the temperature of the furnace rises. Thing 5
causes a difference in thermal expansion.

The high alumina bricks stacked on top are of average size (114mm x 65mm x 230mm).

Further, due to drying shrinkage of the monolithic refractory 5 itself, cracks 13 occur from the upper surface corner of the refractory 2 to the tip of the refractory locking hardware 7 (as shown in the figure). In this case, if there is no supporting material such as anchor metal, it becomes difficult to maintain the integral structure, and the monolithic refractory 5 may fall off or be damaged, reducing the life of the lining refractory and reducing the durability of the furnace.

Problems that the invention aims to solve: When a heating furnace is shut down for internal inspection or partial repair, expansion margins and gaps occur at the joints due to shrinkage of the refractory as it cools. For this reason, it is known that after the restart of operation (reheating), scale etc. invade these gaps, causing a lack of expansion allowance, which often causes bricks to overhang, crack and fall off.

Means for Solving the Problems The inventors of the present invention have conducted various studies and experiments with the aim of solving the above-mentioned defects in the walking hearth type heating furnace hearth. By adopting the technical configuration as described in each item of the registered claims, we have succeeded in significantly improving the various drawbacks of the prior art.

A specific example of the hearth structure of the present invention is shown in FIGS. 1 to 3. Fig. 1 is a perspective view showing an example of applying the hearth structure of the present invention to a movable hearth, Fig. 2 is a sectional view of both the fixed hearth and the movable hearth of a walking hearth type heating furnace hearth, and Fig. 3 The figures are a front view a and a side view b showing an example of an anchor hardware.

In FIG. 1, 7 is a steel can body with a square cross section, and inside the can body 7, as shown, there are a lightweight castable refractory layer 1, a heat insulating brick 2, a clay brick 3, and a high alumina brick 9. are sequentially laminated and constructed, and high-density castable refractory layers 5 are constructed on both sides of these laminated structures as shown in the figure to form an integrated structure. Intrusion of scale, etc., peeled off from the steel material of the object to be heated is prevented from entering between the laminated and constructed bricks 1, 2, 3, and 9 described above. When constructing this high-density castable refractory layer 5, anchor hardware 10 is provided as shown in the drawings to prevent it from falling off, and the upper corners of the insulating bricks 2 are cut to prevent cracks. In addition, in FIG. 1, 6 is a cooling pipe,
8 indicates the refractory expansion margin.

FIG. 2 is a sectional view showing the arrangement relationship between the fixed hearth 20 and the movable hearth 30. The upper surface in contact with the steel material to be heated is made by placing several rows of large bricks 9 horizontally in the fixed hearth 20, and moving the Large brick 9 on the hearth 30
(For example, 114mm thick x 230mm wide x 230mm long)
An example is shown in which each row is arranged in the longitudinal direction of the hearth.

FIG. 3 shows an example of the anchor hardware 10, which has a structure in which one end of the anchor body 11 is curved and the collar 12 is inserted and fixed to increase the locking force of the castable refractory. However, the shape of the anchor hardware can be any suitable shape and structure.

However, the most effective one among them is the one shown in Figure 3, which has a strong strength not found in conventional Y-shaped studs due to the synergistic action of the curved part and the collar part fitted in the vicinity. This provides a great locking force. Therefore, the same effect can be obtained even if the studs are not arranged as tightly as the conventional Y-shaped studs, and therefore materials can be saved.

Effects of the invention The structure of this invention consists of large bricks arranged in a flat manner on the top surface of a divided hearth (fixed hearth and moving hearth), and both sides of which are reinforced with high-density anchor metal fittings of a specific shape. A simple structure with a castable refractory layer allows the hearth structure to be integrated, preventing bricks from protruding, cracking and falling off due to expansion and contraction.
The conventional structure had a useful life of about 6 months, but the structure of the present invention can extend the useful life to over 1 year.

Alternatively, by using large bricks as in the present invention, it is possible to speed up the construction process, reduce the amount of scale entering from the joints when the fire stopper is closed, and furthermore, in the event of heating Even if the bricks are welded, floating can be prevented because they are large bricks.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a movable hearth in the hearth structure of the present invention, FIG. 2 is a partial cross-sectional view of the hearth of the present invention, and FIG. 3 is a front view a and a side view b showing an example of anchor hardware. FIG. 4 is a perspective view of a conventional moving hearth, and in the figure, 1...light castable, 2...insulating bricks,
3 Clay brick, 4... High alumina brick (normal size), 5... High density castable, 6...
Cooling pipe, 7... Can body, 8... Refractory (expansion), 9... High alumina brick (large size),
10... Anchor hardware, 11... Anchor body,
12...Brim part, 13...Crack, 20...Fixed hearth, 30...Movable hearth.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a split hearth of a walking hearth type heating furnace, large bricks 9 are arranged in a flat manner on the top surface of the split hearth, and both sides of the large bricks 9 are arranged in a flat manner. , a walking hearth type heating furnace with a high-density castable refractory layer 5 reinforced with an anchor hardware 10 in which a collar part 12 having an L-shaped longitudinal section is fitted and fixed to an anchor body 11 having a curved one end. Hearth structure. (2) The walking hearth type heating furnace hearth structure according to claim 1, wherein the large bricks 9 are high alumina bricks.