JPH0120064Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heat insulating material feeding device used for dispersing a heat insulating material along the inner periphery of a ladle.

[Prior Art and Problems] A slag layer is formed on the surface of molten steel stored in a ladle, and this serves to prevent heat dissipation of the molten steel. However, the peripheral side of this slag layer that is in contact with the inner peripheral surface of the ladle is likely to cool down, so if no action is taken, even if the surface of the molten steel falls due to tapping, the peripheral part of the slag layer will stick to the inner peripheral surface of the ladle. A ring of a certain width is left behind, exposing the periphery of the molten steel surface, from which heat dissipates from the molten steel. This is undesirable because it causes a drop in the temperature of the molten steel. Therefore, in order to prevent the surrounding area of the slag layer from cooling, for example, a mixed powder mainly composed of aluminum powder and iron oxide powder (which generates heat due to thermite reaction) is sprinkled along the inner circumferential surface of the ladle as a heat insulating material. It is. However, this spraying work has conventionally been done manually, requiring a great deal of labor, and the heat insulating material is thrown up as dust during the work, resulting in the problem that the work must be done in an extremely harsh environment.

[Purpose and structure of the invention] This invention aims to improve work efficiency by making it easier to uniformly spread heat insulating material, and at the same time contribute to improving the working environment. A conical opening/closing valve that opens and closes the outlet by moving up and down is provided at the outlet provided at the center of the lower end, and a feeder attached to the outer wall of the hopper surrounds the outlet and gradually expands in diameter downward. An umbrella-shaped gutter is formed between the outer shell and the inner shell by assembling an outer shell in the shape of a lattice and an inner shell in the shape of a cone while maintaining an appropriate distance between the outer shell and the inner shell. The present invention provides a heat insulating material feeding device for a ladle, which is characterized by the following.

[Function] When the on-off valve is lowered and the outlet is opened, the heat insulating material inside the hopper is evenly distributed radially around the conical surface of the on-off valve due to its own weight, and further flows down the umbrella-shaped gutter. Since it naturally falls from the outer peripheral edge, it is evenly distributed along the inner peripheral surface of the ladle. Further, at this time, since this feeder covers the ladle, the heat insulating material being sprayed does not scatter outside the ladle.

[Example] 1 is a rigid hopper, 2 is an outlet provided at the center of the lower end, and 3 is a hopper 1 so as to surround the outlet 2.
This is a feeder attached to the outside wall of the building. The feeder 3
The outer shell 4 and the inner shell 5 are fastened with screws 6 at an appropriate number of places, keeping an appropriate distance between the outer shell 4 and the inner shell 5. An umbrella-shaped falling gutter 7 is formed between the two. Reference numeral 8 denotes a conical opening/closing valve provided on the outlet side of the outlet 2 so as to be able to move up and down. A hanging rod 11 is loosely inserted into the suspended vertical tube 10 and fixed 12 to the tip of the hanging rod 11, and the base end of the hanging rod 11 is connected to the tip of the piston shaft 14 of the cylinder 13 installed on the cover plate 9. Attach to. In the figure, reference numeral 15 indicates a heat insulating material charging port provided near the upper side wall of the hopper 1. 19
indicates a heat insulating material that is a mixed powder of aluminum powder and iron oxide powder.

As shown in FIG. 3, the insulating material feeding device thus constructed is set so that the feeder 3 covers the ladle 20. Then, by driving the cylinder 13 and pushing down the on-off valve 8 to open the outlet 2, the heat insulating material 19 in the hopper 1 will slide down the gutter 7 of the feeder 3 and be distributed evenly on the inner circumferential surface of the ladle 20. Evenly distributed. Further, the heat insulating material 19 sprinkled inside the ladle 20 at this time is also prevented from being scattered outside the ladle 20 because the feeder 3 covers the ladle 20. It goes without saying that as the heat insulating material, in addition to the mixture of aluminum powder and iron oxide powder shown in this embodiment, granular materials having heat insulating properties such as rice husk and straw ash can be used.

[Effect of the invention] As described above, according to the insulating material feeding device for a ladle of the present invention, when the conical opening/closing valve opens, the insulating material in the hopper is distributed radially evenly around the hopper by its own weight along the conical surface. Furthermore, the insulation material flows down the umbrella-shaped gutter and naturally falls from the outer edge.
The heat insulating material can be uniformly spread around the slag layer and along the inner peripheral surface of the ladle. Therefore, it is free from the conventional spraying work in a bad environment where dust is scattered, and it is useful because it allows the insulation material to be easily and efficiently sprayed without the insulation material scattering outside. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal cross-sectional view, FIG. 2 is a cross-sectional view taken along the - line in FIG. 1, and FIG. 3 is a usage state diagram. 1... hopper, 2... outflow port, 3... feeder, 7... runoff gutter, 8... on-off valve.

Claims (1)

[Scope of utility model registration request] A conical opening/closing valve is provided at the outlet provided at the center of the lower end of the hopper to open and close the outlet by moving up and down. By assembling a lattice-shaped outer shell with an enlarged diameter and a conical inner shell while maintaining an appropriate distance, an umbrella-shaped gutter is formed between the outer shell and the inner shell. A device for introducing heat insulating material into a ladle.