JPS61219462A - Charging method for ladle insulating material - Google Patents

Abstract

PURPOSE:To spray evenly an insulating material over the entire surface of a molten steel by putting the insulating material into a box-shaped jig provided with a grid in the base, carrying the jig over the molten steel and charging the insulating material over the entire surface of the molten steel. CONSTITUTION:A flexible freight container bag 7 of the insulating material is carried on a base plate 3, is combined with an upper frame 4 and is connected by a hoisting chain 5. A hook 2 of a crane is inserted into an eye 8 and the bag is hoisted and is carried over a ladle contg. the molten steel so as to be brought near to the molten steel surface. The bottom of the bag 7 is burned by the heat of the molten steel by which ruptured holes are made and the insulating material is dropped therethrough. The dropping rate of the insulating material is limited by the grid of the base plate 3 so that the falling takes time. The crane is moved longitudinally and transversely by utilizing such time until the insulating material is evenly sprayed on the molten steel surface. The operating efficiency is thus improved and the safety is assured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for adding a heat insulating material to keep molten steel warm in a molten steel ladle in a steel manufacturing process.

[Conventional technology]

The molten steel taken out of the blast furnace is transported by a ladle to the tundish and other processes, but it is necessary to keep the surface of the molten steel warm in order to prevent the temperature of the molten steel in the ladle from dropping until it is sent to the primary process. For this purpose, approximately 200 to 300 kg of heat insulating material such as baked rice is usually added.

Conventionally, as shown in Fig. 2, one bag at a time was placed on the surface of the molten steel in the ladle 1, weighing 5 to 9. The time required was approximately 4 minutes.In order to shorten this temperature drop time,
As shown in Fig. 3, about 200 to 300 klF of heat insulating material is stored in a recon bag 7 and lifted by the hook 2 of the crane installed for transporting the ladle 1, and placed on top of the ladle 1. When carried close to the surface of the molten steel, the lower surface of the flexible container bag 7 is burned by the heat of the molten steel, creating a hole, and the heat insulating material contained therein falls onto the surface of the molten steel.

[Problem that the invention seeks to solve]

The conventional methods described above have the following problems.

(1) Manual method takes time to add heat insulating material.
In addition, it is a safety problem for workers to get close to the beaded edge of the ladle and throw objects into it.

(2) In the method of adding heat insulating material all at once using a flexible container bag, the heat insulating material is lumped together and falls on a part of the surface of the self-molten steel in the ladle, resulting in an exposed area on the surface of the molten steel and the heat insulating effect is reduced. bad.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention has developed a pot heat insulating material, which is characterized in that the heat insulating material is conveyed all at once onto the molten steel through a box-shaped jig equipped with a grid on the bottom, and the heat insulating material is introduced into the molten steel. This provides a method for inputting.

[Effect]

When a bag of heat insulating material stored in bulk is brought close to the surface of molten steel in a ladle using the box-shaped jig according to the present invention, the bag burns, creating a hole and causing the heat insulating material to fall. The latticework prevents them from clumping together and falling,
The insulation material gradually falls off. Therefore, it becomes possible to spread the heat insulating material over the entire surface of the molten steel.

〔Example〕

FIG. 1 is a schematic diagram showing the overall configuration of an embodiment according to the present invention. (In this figure, 6 is a bottom pedestal surrounded by a strong frame t and has a lattice-like crosspiece built into it. 4 is an upper frame that is combined with the bottom pedestal 3 to form a cube. The four corners and the four corners of the bottom stand 3 are connected by hanging chains 5. At the top of the upper frame 4, an eye 8 to be combined with the crane hook 2 is provided.

Next, this effect is applied between stations. A flexible container bag 7 of heat insulating material corresponding to the surface of the molten steel of the ladle 1 is mounted on the bottom stand 6, the upper frame 4 is assembled and the hanging chain 5 is connected, and the hook 2 of the crane is inserted into the eye 8 to raise it. When the flexible container bag 7 is transported over a ladle 1 containing molten steel and brought close to the surface of the molten steel, the bottom of the flexible container bag 7 is burned by the heat of the molten steel, creating a hole and causing the heat insulating material to fall.

At this time, the falling amount of the heat insulating material is limited by the lattice of the base 6, and the time required for the heat insulating material to fall is increased. By using this time to move the crane back and forth and left and right, the bottom base 3 marked by the crane hook 2 and the flexible container bag 7 of heat insulating material spread the heat insulating material evenly over the entire surface of the molten steel in the ladle. be able to.

〔Effect of the invention〕

According to the present invention, it has become possible to spray the heat insulating material on the surface of the molten steel in the ladle using mechanical force, which poses safety problems when using direct manual power, and problems when using bulk heat insulating bags. The problem of uniform dispersion was resolved, and we were able to improve work efficiency and ensure safety.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment according to the present invention, FIG. 2 is a schematic diagram of a conventional manual operation, and FIG. 3 is a schematic diagram of a conventional maneuver. 1: Ladle, 2: Hook, 3: Bottom stand, 4: Upper frame, 5: Hanging chain, 7: Flexible container bag.

Claims (1)

[Claims] A method for introducing heat insulating material into a pot, which comprises transporting the heat insulating material all at once onto molten steel using a box-shaped jig with a grid at the bottom, and dispensing the heat insulating material evenly over the entire surface of the molten steel.