JPS6154511B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction form used when pouring and constructing a refractory lining of a molten metal container using a monolithic refractory.

The molten metal container referred to in this invention refers to a container for storing high-temperature molten metal such as molten steel for transfer or reaction treatment, such as a ladle, tap (steel/slag) trough, hot metal ladle, tundish, vacuum degassing container, etc. A high-temperature processing container. Both the side walls and the bottom (generally called lining) of these containers are lined with a refractory material, and the linings include the side wall permanent lining 1, as shown in the longitudinal section of a ladle in Figure 1. It is composed of a side wall work lining 2, a permanent work lining 3, and a work lining 4, and is generally constructed such that the lower end of the side wall work lining 2 rises from the upper surface of the work lining 4.

In this case, the contact between the two lining refractories is weak and the molten steel or molten slag in the ladle easily infiltrates into this area, and the lining refractory is heated and expands after being fed into the ladle several times, causing the contact. Molten steel and molten slag will continue to infiltrate until the surface is smoothed. Furthermore, as the number of times of use increases, the refractory of the work lining 4 is generally more prone to erosion than the refractory of the side wall work lining 2, so as shown in the erosion part 5 shown in FIG.
First, a cavity is created in the lower part of the side wall work lining 2, and then the work lining 4 on the side wall is melted and damaged, and as a result, the work lining 2 on the side wall is further melted and peeled off, and eventually becomes a large cavity, and finally the side wall Damage may extend to the permalining.

As a countermeasure for this, as shown in Fig. 1, several stages of side wall protection brickwork 6 are constructed around the entire circumference of the inner wall at the bottom of the side wall work lining 2, and the contact area between the side wall work lining 2 and the floor work lining 4 is protected. There are construction methods that protect and prevent the intrusion of molten steel. However, with this construction method, when the ladle is used more than 10 times, a gap is created between the inner wall of the side wall work lining 2 and the side wall protection brickwork 6, and molten steel and molten slag seep into the gap, causing a part of the brickwork to become infiltrated. If it is pushed inward and a part of it falls off, the joints will open in the circumferential direction and the whole piece will fall off at an early stage, making it less effective and uneconomical.

Therefore, it is more effective to prevent the infiltration of molten steel by constructing the side wall protection brickwork 6 using cast monolithic refractories that have a one-piece structure without joints and have good adhesion to other refractories. This pouring construction is shown in the example of a ladle in FIG. This can be done by installing a structural frame 8 and filling the gap by pouring the monolithic refractory mixed with water from above.

In the case of this Fig. 3, the side wall work lining 2
This is a case where the side wall protection irregular shaped wall 7 is constructed after relining both the lining and the work lining 4, but in the case of a ladle, only the work lining 4 and the lower part of the side work lining, which are particularly prone to erosion, are installed. In some cases, a so-called replenishment repair as shown in FIG. 6 is performed. In this case, the majority of the side wall work lining will not be repaired, but only the lower part, which is 1/4 to 1/5 of the total, will be repaired, so in order to balance it with the upper part, the lower part of the side wall protection irregular wall will be constructed. I don't. Therefore, when carrying out construction as shown in Figure 6, the monolithic formwork 8 used in the construction shown in Figure 3 is too small in diameter to be used, so a separate formwork with a larger diameter is used. There was a problem in that we had to prepare for production.

In view of the above-mentioned problems, this invention enables the construction shown in Fig. 3 and the construction shown in Fig. 6 to be carried out using a set of formwork, that is, the size of the cylindrical formwork can be expanded and contracted. The purpose of this project is to provide a pouring formwork that enables the construction of side walls of any thickness. The formwork for pouring construction consists of vertically dividing the frame into 2 to 6 parts, making each divided part mutually expandable and contractible, and sealing the outer end opening between the divided parts.

To explain this invention based on the drawings, Figs. 4 and 5 show an embodiment in which the lower part of the side wall of the ladle is constructed thickly, Fig. 4 is a vertical cross-sectional view of the construction, and Fig. 5 is a divided It is a top view of a formwork. split formwork
In the case of a ladle, 9 is in the shape of an inverted truncated cone, and is vertically divided into four equal parts as shown in Figure 5, 9', 9'', 9, 9〓, and when each divided part is brought into close contact with each other, the fourth
The result will be as shown in Fig. 5. Each division can be moved outward independently, that is, when expanded and used, it becomes as shown in FIGS. 6 and 7. FIG. 6 is a longitudinal sectional view of construction, and FIG. 7 is a plan view of the divided formwork expanded in four directions. 10 in Figures 5 and 7
A formwork having an arbitrary diameter can be prepared by expanding or contracting a moving mechanism such as a hydraulic cylinder for moving each divided portion. Therefore, it is possible to perform pouring work with a side wall thickness that corresponds to the cylindrical shape within this expanding and contracting range. If the container is elliptical, it should have a structure that allows it to expand only in two directions along its major axis, as shown in FIG.

Next, when each divided part of the divided formwork is expanded outwardly, a gap is created between each divided part as shown in FIG. 7, and openings 11 and 11' are formed at the outer ends of the divided parts.
During construction, the poured monolithic refractories flow into these openings, making construction impossible.

Reference numeral 12 in FIGS. 7 and 8 is a lid attached to seal the openings 11 and 11' to prevent this inflow. The height of the split formwork 9 is 60 in the case of a ladle.
~80cm, so the lid 12 of this opening is 3~
Either insert a 4mm iron plate from the top of the formwork with a guide, or put a lid inside the split formwork in advance by straddling the opening of the split formwork, and slide the lid into the split formwork. If the gap is closed by using the opening, the opening can be sealed at all times.

Since the split formwork for pouring construction of this invention has the structure as explained above, the side wall lining and the side wall protection wall can be poured with monolithic refractories to any thickness using one set of formwork. There is no need to prepare multiple sets of formwork during construction.

The divided formwork of the present invention can be applied not only to cylindrical forms but also to square, rectangular, elliptical, and other arbitrary shapes, and an expansion/contraction mechanism suitable for each shape can be installed. Furthermore, the same mechanism can be applied to formworks with any number of divisions from 2 to 6 divisions.
If the number of divisions exceeds 6, the mechanism becomes complicated and impractical.
Moreover, the unevenness of the construction surface also increases, which is not preferable.

Note that this divided formwork can be applied not only to cylindrical ladles but also to formworks for other molten metal containers of various shapes.

[Brief explanation of the drawing]

Figures 1 to 3 are explanatory diagrams of a conventional ladle. Figure 1 is a vertical cross-sectional diagram of each lining, Figure 2 is a vertical cross-sectional diagram showing the melted state, and Figure 3 is a lower part of the side wall. It is a construction explanatory diagram. Figures 4 to 8 are drawings showing embodiments of the present invention, with Figure 4 being a longitudinal sectional view showing construction when the split formwork is closely attached, Figure 5 being a plan view of the same formwork, and Figure 6 Figure 7 is a vertical cross-sectional view showing construction when the divided formwork is expanded, Figure 7 is a plan view when the 4-divided formwork is expanded in four directions, and Figure 8 is when the 2-divided formwork is expanded in two directions. FIG. 3 is a plan view of another embodiment of the invention. 7... Side wall protection irregular shaped wall, 8... Integral structure formwork, 9 ... Divided formwork, 9', 9'', 9, 9〓...
Each divided part of the divided formwork, 10...Movement mechanism, 11,
11'... Outer end opening of the split formwork, 12... Lid.

Claims (1)

[Claims] 1. In the formwork for pouring unshaped refractory material into molten metal containers, the formwork is vertically divided into 2 to 6 parts,
A formwork for pouring construction in which each divided part is movable in the radial direction, and the outer end opening between the divided parts is sealed using a removable lid or a slidable lid built into the formwork.