JPH0225688A - Repair of bend tube for ladle smelting slag sucking device - Google Patents

Abstract

PURPOSE:To facilitate replacing work and reduce a cost for replacing by a method wherein the part of a rear bend tube, which is damaged seriously, is notched and opened while a liner member is mounted detachably into the notched and opened part. CONSTITUTION:Only a part of the inner curved surface of the outside of a bend tube 1, which is damaged seriously especially by the collision of slag sucked by a sucking device, is notched and opened so as to be tapered so that the diameter thereof is reduced toward the outside of the tube. A liner member 3, formed so as to be capable of being fitted integrally into the notched opening, is fitted into the opening from the inside of the bend tube 1 while a liner supporting member 5, crossing the outer surface of the liner member 3, is bridged on the curved surface of the outside of the bend tube 1. Next, clamping members 6, 6,... such as bolts or the like are clamped into the liner member 3 through a space between the liner supporting member 5 and the liner member 3, then, the liner member 3 is attracted to the liner supporting member 5 strongly to each other by the clamping members 6, 6,... whereby the liner member 3 may be fitted into and mounted to the inside of the notched opening 2 rigidly.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method of replacing and repairing only parts that are particularly worn when suctioning slag from a ladle of a torpedo car or the like using a suction device.

<Prior art and problems to be solved by the invention> Hot metal is injected from a blast furnace into, for example, a torpedo car, and while being transported to a converter factory, Na, CO♂ and Ca are desulfurized in the hot metal.
There is a method of adding a desulfurizing agent such as O.

In this case, a desulfurizing agent such as NaλCO= or CaO reacts with the sulfur component in the hot metal to form slag on the upper surface of the hot metal. Therefore, before transferring the slag to the converter, it must be removed.The device for removing the slag is as shown in Fig. 4, in which water is injected onto the slag a, and the slag is cooled and solidified using a suction pipe. There is a method of removing the slag a by suction using a vacuum pump e.

In this case, the suctioned slag particularly violently collides with the bent portions of the front bend pipe C and the rear bend pipe d, which are arranged after the suction pipe S, and the wear becomes significant, and the bend pipe The device itself has to be replaced, which is very costly both in terms of work and materials. That is, even though it is made of high chromium cast iron or the like in consideration of wear resistance, it is subject to severe wear and tear. Furthermore, even if only that part of high chromium cast iron is repaired by overlay welding, there is a problem in that the base metal tends to crack during underlaying, making it impossible to repair satisfactorily.

In order to solve the above-mentioned problems, the present invention aims to provide a method for freely replacing and repairing only the parts of the bent pipe that are severely worn.

<Means for Solving the Problems> The above objects of the present invention can be achieved by the following repair method. That is, the gist of the invention is to provide a notch opening on the outside of the bent part of the bent pipe, which is subject to particularly severe wear and tear due to the collision of slag sucked by a slag suction device, and to make a liner member that is tightly fitted into the notch opening removably attachable. This is a method for repairing a bent pipe of a pot smelting slag suction device, and the outer surface of a liner member is formed so that the inside of the notch opening is tapered outward, and the outer surface of the liner member is closely fitted into the notch opening. and a liner support member installed to horizontally suspend the liner member, and a bend pipe for fixing the Leica member in a replaceable manner by connecting the liner member with a fastening member such as a bolt so as to forcibly connect them to each other. This is a repair method.

<Embodiments and Effects> The method for repairing a bent pipe of the present invention will be described in detail below with reference to drawings showing embodiments thereof.

As shown in Fig. 1, the bend pipe (1) used at the front and rear of the slag suction device is used for about 30 days, so that the outer and inner curved surfaces of the bend pipe (1) become slag suctioned by the suction device. Wear and tear due to collisions.

Therefore, as shown in FIG. 2, only the α portion, which is subject to particularly severe wear, is cut out in a tapered shape with a reduced diameter toward the outside.

Then, as shown in FIG. 3, the liner member (3) formed to be able to be fitted integrally into the notch opening (2) is fitted from inside the bend pipe (1), and then the liner member (3) is fitted into the notch opening (2). ) is provided with a liner support member (5) that horizontally spans the outer surface of the fitted liner member (3). ) By connecting the fastening members (6), (6), etc., such as bolts, with a space between them and the outer surface, as shown in Fig. 4, the fastening members (6), (6), By rotating and tightening..., the liner support member (5) and liner member (3)
) are strongly attracted to each other by the fastening members (6), (6),..., and the liner member (3)
can be firmly fitted into the notch opening (2).

In addition, when removing the liner member (3), by loosening the fastening members (6), (6), etc., they are released from the mutual attraction force, and the fastening members (6), (6),・・・
- a screw hole (7) provided in the liner member (3);
(7) The liner member (3) can be easily removed by removing it from...

The liner member (3) is desirably made of a material that is wear resistant to the material used to form the bend pipe (1), such as high chromium cast iron, such as camphor. Furthermore, there are various possible ways to attach the liner member (3), but as described above, the liner support member (5) and the liner member (3) can be attached using the fastening members (6), (6).

If the configuration is such that they are attracted to each other by...
Welding the liner support member (5) to the bend pipe (1),
Alternatively, there is no need to directly attach it with bolts or the like, and it can be easily attached to and detached from the existing bend pipe (1).

<Effects of the Invention> As described above, according to the present invention, only the portions of the front and rear bend pipes that are subject to particularly severe wear are cut out, and the liner member is removably installed in the cutout openings. Conventionally, approximately 12 bent pipes were required per year, but with the present invention, only the liner member is required, and replacement work can be easily performed, significantly reducing the annual replacement cost. In other words, without wasting the bend pipe itself,
By minimizing the number of parts to be replaced, it is possible to use the bent pipe economically and with good replacement work efficiency.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are explanatory diagrams showing the repair process of a bent pipe according to the present invention, FIG. 4 is a detailed explanatory diagram of the present invention, and FIG. 5 is an explanatory diagram showing an outline of the slag suction device. It is a diagram. In the figure, (1): Bend pipe (2): Notch opening (3) Niliner member (5) Niliner support member (6), (6), ...: Fastening member patent applicant Fuji Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A notch opening is formed on the outside of the bending part of the bend pipe, which is particularly prone to wear and tear due to the collision of slag sucked by the slag suction device, and a liner member that is tightly fitted into the opening can be freely attached and detached. How to repair the bent pipe of a ladle smelting slag suction device installed on. 2. The opening is formed into a tapered notch whose diameter decreases from the inside of the tube toward the outside, and a liner member is tightly fitted into the opening, and the liner member is tightly fitted into the opening, and the liner member is fitted closely to the outside of the bent portion of the bent tube. A liner support member is installed to horizontally support the liner member, and a space is separated between the outer surface of the liner member and the liner support member, and the liner member is forcibly connected to each other by a fastening member such as a bolt. A method for repairing a bent pipe of a ladle smelting slag suction device, characterized by fixing it.