JP2002372379A - Opening/closing device of delivery gate employing conductive refractories - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a large scale facility is required because an 'opening machine' and a 'mud gun' are conventionally employed for opening/closing the delivery gate of a furnace and the work is troublesome because they are used alternately and a choking material, i.e., 'mud', must be supplied, and to simplify the facility and the work while eliminating the material. SOLUTION: A current is induced in a sleeve 7 made of conductive refractories by conducting a coil 8 at the delivery gate of a furnace and a choking ore is heated by its conduction heat and melted thus starting delivery of molten. At the time of ending delivery of molten, power supply is stopped and the ore in the sleeve 7 is cooled by radiating heat and solidified thus choking the delivery gate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace for handling not only metal but also all kinds of mineral melts, such as an industrial furnace such as a metal melting furnace and a refining furnace, and a processing furnace for melting cinders of waste into roadbed material.

[0002]

2. Description of the Related Art Conventionally, a hole is opened with a rock drill generally called an "opening machine" to open a hole for tapping, and a taphole is closed using a machine also called a "mud gun" to close the hole. Was smashed with clay.

[0003]

Conventionally, the "opening machine" and the "mad gun" occupy the space on both sides of the tap hole, and it has been necessary to alternately move the tap hole at the start and stop of the tap hole toward the tap hole. .

[0004] In addition, clay is required as a material to block the tap hole, and it has been necessary to replenish it.

In view of this situation, the present invention provides a furnace for intermittently tapping a molten metal, which simplifies the operation of opening and closing the tap only by turning on and off a power switch, and further comprises an opening machine and a mud gun. The purpose is to eliminate the space occupied by clay and to eliminate the need to supply clay as a material.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a furnace for intermittently discharging a molten metal (hereinafter referred to as "furnace").
And an opening / closing device for a tap hole using a conductive refractory. This switchgear has the following configuration. In the center there is a sleeve made of conductive refractory, which is a passage for the molten metal, and a heat insulator, which is a poor conductor of electricity, around the sleeve.A good conductor of electricity is used to generate an induced current in the sleeve by winding around it. It consists of the resulting coils and the refractory to which they are fixed. After energizing the coil,
The inner diameter of the sleeve and the amount of electricity are set to optimal values so that the minerals that are fixed or blocked in the cylinder are quickly melted and opened when the power is turned off.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of the furnace, and FIG. 2 is a vertical sectional view thereof. In the figure, 1 is a steel plate of an outer wall, 2 is a refractory and heat insulating material constituting a wall and a floor, 3 is a molten metal, 4 is an electrode rod, 5 is a tap hole according to the present invention, and 6 is a metal fitting for fixing 5 to a furnace body. .
This figure shows an electric resistance type furnace as an example, but there are no 4 in the case of a low and high frequency induction furnace. Also, in the case of this drawing, the tap hole is attached to the wall sideways, but may be attached to the floor downward. FIG. 3 is a detailed sectional view of 5, and FIG. 4 is a left side view thereof. In the figure, 7 is a sleeve made of a conductive refractory, 8 is an electric induction coil, 9 is an insulating heat insulating material, 10 is a refractory, and 11 is a terminal for supplying electricity to the coil. Refractories other than 7 are also poor conductors of electricity. When an alternating current is supplied from the coil 11 to the coil 8, an induced current is generated in the sleeve 7, and the conduction heat causes the temperature of the sleeve 7 to rise, thereby dissolving the mineral blocking the metal. leak. When the supply of electricity is stopped, the temperature of 7 drops, and the fluid solidifies, especially near the outlet, and stops flowing.

[0008]

According to the present invention, first, large-scale facilities such as an "opening machine" and a "mad gun" are not required, and the space occupied including the working space is not required. The operation for starting and ending the hot water supply is simplified to only the ON / OFF of the power switch, as compared with the complicated operation of alternately moving the above-described machines in the past. There is no need to supply "Mad" as a material. Further, according to the present invention, it is possible to increase the fluidity by continuing the energization and the heating even for the molten metal which has a poor fluidity and tends to be clogged, and it is difficult to continue the molten metal to maintain the continuous molten metal. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a furnace equipped with a tap hole incorporating a switchgear according to the present invention. As an example, an electric resistance type furnace is shown, so that the electrode rod 4 is drawn, but this is not present in an induction furnace or the like.

FIG. 2 is a schematic sectional elevation view of FIG.

FIG. 3 is a schematic sectional view of a taphole in which the opening and closing device according to the present invention is incorporated.

FIG. 4 is a schematic left side view of FIG. 3;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Furnace outer wall steel plate 2 Fireproof and heat insulating material constituting furnace wall and floor 3 Molten 4 Electrode rod 5 Tap hole 6 Tap hole stopper 7 Conductive refractory sleeve 8 Induction current generating coil 9 Electrical insulating heat insulator 10 Fireproof material 11 Electricity supply terminal

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F27D 11/06 F27D 11/06 Z

Claims (1)

[Claims] 1. An electric conduction type melting furnace, a low / high frequency induction furnace,
In a furnace where minerals are being melted inside a blast furnace, a refining furnace, etc., the taphole of the furnace is heated by induced current generated inside the conductive refractory to melt the solidified clogged minerals. An opening / closing device that is opened by a switch, shuts off the power supply to stop heat generation, and lowers the temperature to solidify and close the fluid. 2. A tubular taphole made of a conductive refractory,
A switchgear having a coil made of a substance having a high electric conductivity for generating an induced current separated by an electrically insulating heat insulating material on the outside thereof.