JPS58221644A - Applicating method of protective material for lining tundish - Google Patents

Abstract

PURPOSE:To form a protective material for lining a tundish quickly and mechanically with high efficiency, by providing a form on the inside of the lining refractory material of the tundish, and forcibly feeding the mortarlike protective material into the clearance between both. CONSTITUTION:A form 5 is provided on the inside of the lining refractory material 4 of a tundish 1, and a uniform spacing S of 20-40mm. is formed between both. Plural injection holes 6 and vent holes 7 are provided on the top surface of the form 5, and the mortarlike refractory protective material sent forcibly from a feed pipe 8 is forcibly fed into the spacing S through the holes 6. The air in the spacing S is discharged through the holes 7 so that the protective material is forcibly fed uniformly in all corners in the spacing S. The form 5 is removed, and the formed protective material layer is dried and cured, whereby the protective material layer is completed. Since the application of the protective material is mechanized, manpower is lessened, and the protective material layer having a long service life is formed in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a protective material for a lining refractory of tampu innocy when continuous casting of steel is carried out.

Conventionally, the methods for constructing this kind of tandy-shishi lining protective material are generally to protect the surface by applying a mortar-like material to the entire surface with a trowel to a thickness of 20 to 110 mm, and to form a 20 to 30 mm plate called a board. A method of attaching the entire body is used.

However, in the case of the former edge coating method, the accuracy of the finish is affected by human factors, such as having to rely on the skill of the trowel coating operator, so it is not possible to eliminate any variation in the work. Without 1. In particular, it is extremely difficult to fully maintain the uniformity of the construction body, such as the thickness and density of the protective material, and there are various drawbacks such as the occurrence of cracks and the tendency for molten steel to penetrate. In this case, there is no problem with the homogeneity of the board material because it is manufactured by press molding, but the construction of the complex shape of the tundish and some of the corners is cumbersome and labor-intensive. It was inevitable that the number of man-hours would increase and the construction period would become longer. Since both construction methods rely on manual labor, there is a strong need to mechanize and save labor.

The present invention has been made in view of the above, and is intended to solve the conventional drawbacks and meet the demands of the industry by providing a method of constructing a tundish lining protection material as described below.

This invention is a method of constructing a tamp isoshi lining protective material, which is characterized in that a formwork is fully placed inside the tamp isothie, and a mortar-like fluid material is fully injected under pressure into the gap between the formwork and the tamp isothy lining material to form a protective material layer. It is in providing the law.

An example of construction according to the present invention will be explained with reference to the drawings.

First, in FIG. 1 of the drawings, reference numeral 1 denotes a tundish made of permanent bricks 3 whose outside is covered with an iron shell 2, and whose inner surface is lined with a refractory lining t. At that point, the formwork 5 is fully placed inside the tandy fuselage/, and a gap st of about 20 to 1Qmm is created between the formwork S and the lining refractory t.
- form. On the upper surface of the formwork S, a plurality of injection ports B and a deaeration lower are arranged, each of which communicates with the gap S. And each injection port B is equipped with a pressurizing pump l, which will be described later.
The grout injection pipes from S are connected to each other by di-B in)/(7 as shown in Figure 3. Numeral 9 is a seal. Also, each deaeration lower has a degassing tube as shown in the figure. The deaeration plugs// are equipped with a main body 12 having a plurality of exhaust holes/, 2tlt- on the upper surface, and a main body 1
70-1-/3 having a through hole /3a on the lower surface which is fitted so as to be vertically slidable in the inside of the deaeration plug /I, and the deaeration plug /I is loosely fitted into the deaeration lower. They are each attached to the upper surface of the formwork j by set screws /4'. Pressure pump/
! ;(/i As shown in Figures S and O of the drawing, it is a plunger set pump that performs pressurizing pump action by the action of a hydraulic ram L operated by a hydraulic pump 19, and a suction valve /7 is interposed on its suction side. A material pumper/g is provided, and the discharging side thereof is connected to the base end of a grout injection pipe whose tip end is connected to each of the injection ports B, respectively.

Now, by activating the hydraulic pump 19 and fully operating the hydraulic ram/B, the mortar-like fluid material in the material hopper/1 is forced to be fed through the grout injection pipe g by the pressurizing pump/j and from each injection port B. The material is injected into the gap S, and at this time, it is degassed to the outside through the deaeration plug of each deaeration lower, replacing the mortar-like fluid material injected into the gap S. It is. In other words, as shown in the figure, the air in the gap S is descending through the descending float/3 (Da hole/3).
, a'f-, enters the main body 12 as shown by the arrow, and is further discharged to the outside from the upper surface exhaust hole /2a of the main body 12.

When the injected mortar-like fluid material is completely filled in the gap S, the float 13 of each deaeration plug // rises and becomes in a state of blocking each exhaust hole /, 2a on the upper surface, and the tundish Approximately 20 to 110 on the surface of the lining refractory t
A protective material layer with a thickness of mm is formed. After that, the formwork and all attached piping and fittings were removed, and the work was completed by drying and curing.

Since the construction method of the present invention has the above-mentioned configuration, it has an outstanding effect of mechanizing the construction of the protective material, saving labor, and significantly reducing the construction work.

According to the construction method of this invention, the work efficiency is greatly improved by mechanizing and automating the work compared to the conventional troweling work or board assembly work, and the construction time of the TANDISHI lining surface protection material can be significantly shortened. Moreover, it has a significant effect that it is possible to eliminate variations in the material of the protective material, thereby improving the average service life.

In addition, the finished surface and shape of this invention are determined by the internal formwork, so it is possible to always construct a stable product, and there is no need to worry about the complexity of constructing complex-shaped parts or parts of the hooker, which is required with conventional methods. Moreover, because the injection injection work is performed using mechanized equipment, by accurately setting the operating conditions, it has become possible to completely eliminate variations in material quality caused by human factors.

Furthermore, this construction method ensures a homogeneous structure of the protective material, which has the excellent effect of completely preventing the occurrence of cracks and inhibiting the penetration of molten steel, and also strengthens the tandyshie lining material. A side effect is that a large bearing force noise is produced for the structure.

[Brief explanation of the drawing]

The drawings show all the construction examples of the present invention. Fig. 1 is a longitudinal sectional side view of the main part, Fig. 2 is an open plan view, Fig. 3 is an enlarged longitudinal sectional view of the material injection port, and Fig. 1I is an exploded view. The enlarged vertical cross-sectional view of the air plug attachment part, and the J and O figures are vertical cross-sectional views of the pressurizing pump. / , tanditshu, 2 iron skin, 3 permanent brick, 11. Lining refractories! , formwork, injection port, 7. deaeration port, grout injection pipe. W, seal, 10 joint, //,, deaeration plug, /21 body, /2a, -exhaust hole, /3 float, /3a・9 through hole, /4 set screw. lS...Pressure pump, lB Hydraulic ram, 17° suction valve, ig Material hopper, /9 Hydraulic pump, S10 gap. Patent applicant Tokyo Ceramics Co., Ltd.

Claims (1)

[Claims] Construction of a Tandifushi lining protection material, which is characterized in that a formwork is installed inside the Tandifushi, and a mortar-like fluid material is fully injected under pressure into the gap between the formwork and the tamp isoshi lining material to form a protective material layer. Law.