JPH03180416A - Apparatus for applying refractory for lance pipe - Google Patents

Abstract

PURPOSE:To thoroughly apply refractory around a lance pipe and to improve service life of the pipe at a low cost by horizontally setting the lance pipe to be coated with the refractory in hollow part and making supporting table of divided mold excitable. CONSTITUTION:The hollow parts 8 are arranged between the lower mold 7 and upper mold 6 and the lance pipes 1 for supplying gas or flux into molten metal are horizontally set in the hollow parts 8. Around this pipe 1, gap corresponding to thickness of coating refractory 9, is formed. A flowing-in hole 10 for refractory 9 communicated with the hollow part 8 is arranged to the above upper mold 6, and the divided mold 2 is supported on the excitable table. Further, a hopper 18 for pouring the refractory 9 into the above flowing-in hole 10 is set as possible to run at height as bridging the divided mold 2. Then, the refractory 9 is applied at outside of the lance pipe 1.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a lance pipe for blowing or injecting gas or flux onto the bath surface or in the bath of a pig iron mixer or ladle charged with molten metal. The present invention relates to an apparatus used for coating refractories.

Because lances are subjected to severe thermal loads such as radiant heat from the molten metal bath and adhesion of base metal and slag, they wear out rapidly, so the surface of the lance pipe is coated with refractory material to extend its service life.

(Prior art) The thickness of the refractory covering the lance pipe is, for example, 30 to 30 mm.
When thickening to about 200mm, 5 to 30Ill1m
The former is high in cost but has a long service life, while the latter is low in cost but has a short service life.In reality, construction should be carried out according to the latter, which has excellent cost performance. is advantageous. Equipment used to thinly coat refractories on lance pipes include extruders,
It is known that a plastic refractory is crimped around a pipe inserted into the center of the frame by pressure extrusion, but when the resulting lance pipe is used under the harsh operating conditions of recent years, it only takes one heat. It is also difficult to withstand use.

It is also a forming method for increasing the thickness of the refractory coating.
It has been considered to apply vertical pouring to cases where the thickness of the coating is thin, but it is necessary to add a large amount of water to the refractory to ensure fluidity of the refractory, resulting in problems with the durability of the coating layer. cannot be improved.

(Problems to be Solved by the Invention) Therefore, the present invention aims to provide a device that realizes a pouring bottom shape that requires a small amount of water added to the refractory, and thus can manufacture a lance pipe with a long service life at low cost and with high efficiency. That is.

(Means for Solving the Problems) The present invention is an apparatus used for coating the outside of a lance pipe for supplying gas or flux onto the surface of molten metal or into molten metal with a refractory material, which comprises: Providing at least one cavity between the lower mold and the upper mold to be closed, in which a lance pipe can be horizontally arranged and a gap corresponding to the thickness of the refractory coating is formed around the arranged lance pipe; A split mold with a refractory pouring port communicating with the cavity in the upper mold is supported on a table that can vibrate, and a hopper for pouring the refractory into the pouring port of the upper mold is mounted at a height that straddles the split mold on the table. This is a refractory coating device for lance pipes that is installed so that it can run on the ground.

(Function) The refractory coating device of the present invention allows the lance pipe that covers the refractory to be placed horizontally in the cavity, making it easy to pour the refractory into the cavity. By applying vibration, the split mold can be vibrated, and the refractory can be spread evenly around the pipe.

In other words, when conventionally pouring material with a small amount of added water was to be applied vertically, it was impossible to reduce the construction thickness to less than 30 mm due to poor fluidity of the pouring material, even with vibration. By performing vibration in a horizontal arrangement, a sufficient construction body can be obtained even when the construction is made with a thin wall of about 5 to 10 thicknesses.

(Example) Fig. 1 shows a plan view of a refractory coating device according to the present invention, and Figs. 2 and 3 show the river-■ line in Fig. 1 and the II[-1
111 line are shown respectively.

In the figure, l is a lance pipe before being coated with refractory material (hereinafter referred to as core metal pipe), 2 is a split mold in which this core metal pipe l is placed, and split mold 2 is placed on a stand 4 equipped with an excitation device 3. The stand 4 is supported by spring legs 5.

As shown in FIGS. 4 and 5, the split mold 2 consists of an upper mold 6 and a lower mold 7, and there is a cross section between them that has a circular or polygonal shape when the upper and lower molds are closed together, e.g. A hexagonal cavity 8 is provided, and the upper mold 6 is divided into an upper left mold 6a and an upper right mold 6.
b, and one upper side of the hexagonal column serves as an inlet 10 for injecting the refractory 9. In addition, as shown in FIG.
1.12 is provided, and the cored metal pipe l is fixed at the center of the cavity 8 by a holding frame 13.14.

The cored pipe 1 is fixed at a position where its tip is slightly separated from one of the supports 12, and the proximal end of the pipe is attached to the support 1.
A highly rigid auxiliary support rod 15 is inserted closely into the pipe at the tip of the cored pipe 1, and this auxiliary support rod 15 is attached to the other support portion 1.
This is done by supporting it with 2 and fixing it with a presser frame 14.

As shown in FIG. 1, a plurality of the split molds 2 are arranged between tracks 16, and a frame 17 that straddles the split molds 2 at a height exceeding the track 16 is movably installed. A hopper 18 is provided so as to be movable in the length direction of the split mold 2. The frame 17 moves by itself until it reaches directly above the split mold 2, and then moves the hopper 18 directly above the pouring port 10 of the split mold 2.
0, pour the refractory into the cavity 8 to which the cored pipe 1 is fixed, fill the split mold 2 with vibration using the vibrating device 3, fill it with the refractory 9, and fill the outside of the cored pipe 1 with the refractory 9. Cover with After the refractory has developed sufficient strength, the lance pipe is removed from the split mold 2 and the auxiliary support rod 15 is removed. Note that it is desirable that the frame 17 and the hopper 18 be moved by remote control.

Further, it is preferable that the specifications of the vibration device 3 are selected in consideration of the characteristics of the refractory, such as filling properties, uniformity, and deaeration properties. For example, if 5 cavities for coating a 11 mm thick refractory on a pipe with a length of 3.5 m and a diameter of 38 MO+ for hot metal pretreatment are installed in one split mold, 25
It is preferable to use a vibration device capable of applying vibrations of 00 to 3500 r, p, m to the split mold.

Further, near the starting end of the track 16, a kneader 19 for supplying refractories of a predetermined composition to the hopper 18 is disposed at a height above the hopper 18 to further improve workability.

Next, the table below shows the results of using a lance vibrator coated with a refractory material using the apparatus shown in FIG. 1 in an actual furnace. The composition of the coated refractory is Atzo:+near 0w
tχ, 5to2: 15wtX and SiC: 10wt$
T: Yes.

For comparison, the results of use in an actual furnace are also shown in the table below for lance vibes coated according to the conventional method using pultrusion coating and vertical pouring equipment.

* lance cost index: index value when the cost of the conventional pultrusion coating method is set as 100 2 service life number of heats when used for hot metal pretreatment operation in a nidopeed car 3 cost performance = cost per l heat Index (Lance cost/Number of service life) As is clear from the above table, when using the device according to the present invention, the cost is not much different from that of the conventional drawing method, while the number of service life is increased by three times, and the cost performance is higher than that of the conventional method. It was 0.20-0.40% of the example.

Although the above example shows an example of construction in which the coating thickness of the refractory is thin, it goes without saying that the present invention is advantageously applicable to construction in which the coating thickness is thick.

(Effects of the Invention) By using the device of the present invention, a lance vibrator with a long service life can be provided at low cost.

[Brief explanation of drawings]

Figure 1 is a plan view of the refractory coating equipment; Figure 2 is a sectional view taken along the ■-T line in Figure 1. Figure 3 is a sectional view taken along the line ■-■ in Figure 1. Figure 4 is a cross-sectional view of the split mold. FIG. 5 is a longitudinal sectional view of the split mold. ■・- Core metal vibrator 2-split type 3- Vibration device 4- units 5-legs 6-upper mold 7-・-Lower mold 8-Cavity part 9・-Refractory 11.12...Support part 15.-Auxiliary support rod 17-Framework 19...Kneading machine 10...-Inlet 13.14-11 presser frame 16...-orbit 18- Hopper Figure 1 drunkenness ancestor 119 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. A device used for coating the outside of a lance pipe for supplying gas or flux onto the surface of or into molten metal with a refractory, comprising a lower mold and a device closed to the lower mold. At least one cavity is provided between the upper die and the upper die, in which the lance pipe can be placed horizontally, and a gap corresponding to the thickness of the refractory coating is formed around the arranged lance pipe. A split mold with a refractory pouring port connected to the upper mold is supported on a table that can vibrate, and a hopper for pouring refractory into the top mold's pouring port can be moved at a height that straddles the split mold on the table. Refractory coating equipment for lance pipes installed.