JPS5848835B2 - How to strengthen refractories - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for preventing cracking and breakage occurring in refractory products, such as sliding plate bricks or lower nozzle bricks in molten metal discharge equipment. .

[Prior art]

Conventionally, for buttons, a method was taken in which a hoop frame was made of a band-shaped iron plate approximately 1.5 mm thick and was brought into contact with the outer periphery of the refractory product. It had the disadvantage that it was difficult to get used to it, and the work itself was time-consuming.

[Purpose of the invention]

The present invention aims to eliminate these drawbacks, and its purpose is to prevent cracks and breakage of refractory products by uniformly and firmly tightening the refractory products from the entire circumference. The purpose is to provide a method for strengthening refractories.

[Structure of the invention]

In order to achieve the above object, in this example, the outer periphery of the refractory product is wrapped multiple times while heating a belt-shaped thin iron plate, and if necessary, welds are inserted at required intervals along the way, and then the winding is performed. The fastened ends are welded to form a hoop, which prevents breakage of the refractory product.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the accompanying drawings.

1 to 4 show refractory products strengthened by the reinforcing method of the present invention, 1 is a special refractory product, 2 is a strip-shaped thin iron plate, and 3 is a welding point.

Also, the thickness of the strip-shaped thin iron plate 2 is 0.3 to Q, 7 mm.
Use the one.

An example of the apparatus used in the reinforcing method of the present invention is shown in FIG. 5, in which reference numeral 10 denotes a base made of an insulating material.

On the base 10, there is a rotary plate 13 for installing a refractory product, which is rotated by a drive motor 11 and has a refractory product position fixing plate 12 on a vertical mounting surface, and the center of the rotary plate 13. a refractory product chucking suction hose 14 that communicates with the refractory product 1 and suctions and fixes the refractory product 1 to the mounting surface of the rotary plate 13;
Two sets of power supply rollers 15, 16 that heat the belt-shaped thin iron plate 2 by applying electricity to the belt-shaped thin iron plate 2 that is wound under tension around the refractory product 1 on the rotary plate 13. A tensioning roller 17 rotates in the opposite direction to the rotating plate 13 to apply tension to the iron plate 2 wrapped around the refractory product 1 by the rotating plate 13K, and a tensioning roller drive motor 18 that drives the tensioning roller 17. , an arc spot cylinder 1 for spot welding a hoop mounted on a rotary plate 13 and tightened to a refractory product 1;
9, a hoop heating transformer 20 that supplies power to the power supply rollers 15 and 16, and an arc spot transformer 21 that supplies power to the arc spot cylinder 19 are mounted.

The housing 22 is placed behind the base 10, and the tensioning roller 1
7. A thin iron plate supply reel that feeds the thin iron plate 2 around the refractory product 1 on the rotary plate 13 via power feeding rollers 15 and 16.

To show an embodiment of the reinforcing method of the present invention using the above-mentioned device, the thin iron plate 2 is pulled out from the steel rail 22 and wrapped around the refractory product 1 through each roller. The refractory product 1 is placed on the rotating plate 13 for attaching the refractory product, and is clamped and fixed by the position fixing plate 12, and at the same time, the suction hose 14 is activated to suction and fix the refractory product 1.

Next, the same thin iron plate 2 is wound about half a turn, the thin iron plate 2 is crimped onto the refractory product 1 using the crimping fixing plate 23, and electrical heating is applied between the refractory product fixing plate 23 and the guide power supply roller 15 to bring it to an appropriate temperature. When it reaches that point, it is wound one more time while applying a slight gravitational force, then the thin iron plate crimping and fixing plate 23 is pulled out, the gravitational force is increased, and the winding is continued in a prescribed manner.

During this period, the current heating is switched to between the guide/roller 15 and the power feeding roller 16.

When the specified dimensions are reached, spot welding is performed on the corners of the refractory product 1, and the refractory product 1 is made into a product by turning the refractory product 1 a further half turn, spot welding at the target position, cutting off the hoop, and removing the refractory product 1.

Note that it is also possible to provide only a welded part as a fastener at the end of winding without intervening a welded part in the middle.

With the configuration described above, the present invention can achieve the following effects.

(b) Since a large tensile force is applied to the thin steel plate while wrapping it around the refractory product, the thin steel plate will strongly tighten the refractory product from the entire circumference, and after spot welding, there will be no shrinkage force in the hoop. This further increases the refractory product tightening effect.

Furthermore, in the present invention, since the thin iron plate is preheated during seaming, when the hoop cools down after seaming, the hoop shrinks and the refractory product is further tightened strongly and uniformly over the entire circumference. Become.

This prevents plate bricks and nozzle bricks from cracking during use, and even if they do crack, the refractory product can maintain its shape, making it easier to handle after use. .

(Exposure) Next, regarding dimensional adjustment, conventionally the thickness of the iron plate was changed each time, but this time, the number of windings (
The adjustment can be made easily (3 to 5 times), and the adjustment dimensions can be made accurately.

←→ Furthermore, as an effect that could not be achieved with conventional methods, if you want to create a cushioning role between bricks and hardware, it is impossible to create a cushioning effect because conventionally a single board is used. However, when wrapping multiple hoops as in the present invention, it is easy to freely adjust not only the cushion but also the vertical and horizontal dimensions of the brick by wrapping various objects between the hoop layers as necessary. I can do it.

(d) The work according to the present invention can be easily mechanized.

(e) It can be applied to objects with complex shapes.

(f) Other data are as follows.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a sliding nozzle brick, which is a refractory product obtained by the present invention, Fig. 2 is a vertical cross-sectional view taken along line I-I in Fig. 1, and Fig. 3 is another refractory product. Fig. 4 is an explanatory drawing showing changes in the hoop as an example, Fig. 5 is a perspective view showing an example of the apparatus used to carry out the present invention, and Fig. 6 is a process of the present invention. An explanatory diagram showing an example. In the figure, 1: refractory product, 2: strip-shaped thin iron plate, 3: welding point}, 1 1: drive motor, 12: refractory product position fixing plate, 13: rotating plate for refractory product installation, 14: refractory Suction hose for product chucking, 15: Power supply roller, 1
6: Power supply roller, 17: Tensioning roller, 18: Tightening roller drive motor, 19: Arc spot cylinder,
20: Flip heating transformer, 21: Arc spot transformer, 22: Thin iron plate supply reel.

Claims (1)

[Scope of Claims] 1. A hoop is formed by wrapping a strip-shaped thin iron plate around the outer periphery of a refractory product such as a plate brick or a nozzle brick while heating and applying a tensile force, and welding the wrapped ends. A method for strengthening refractory products. 2. Tighten the outer periphery of a refractory product such as a plate brick or nozzle brick while heating and applying tensile force to a strip-shaped thin iron plate, and interpose the welded part at intervals in the middle of the seaming to tighten the seamed end. A method of reinforcing a refractory product, the method comprising welding it into a hoop.