JPH0548079Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a stamp used when lining or repairing the hearth of an industrial kiln or the bottom of a molten metal container with monolithic refractory stamp material. This invention relates to improvements in the head of a rammer, particularly to prevention of peeling of stamp material during use.

[Prior Art] Conventionally, magnesia or carbon stamp materials have been stamped on the hearth of an electric furnace or the corners of a ladle bed, but stamping rammer heads (hereinafter simply referred to as (referred to as "rammer head") is stamped surface 2 of rammer head 1 as shown in the perspective view of Figure 5.
Either the stamp was flat, or the entire stamp surface had a gently convex curve.

Further, the planar shape of the stamp surface is square, rectangular, triangular, etc., and the planar dimensions are various in size depending on the construction details.

Stamping is carried out by spreading an appropriate amount of the specified stamp material over the area to be stamped, stamping it evenly with the stamp surface of the rammer held by the worker and compacting it, and then applying the same procedure to the upper surface. The same process is repeated to create multiple layers to a predetermined thickness.

[Problems to be Solved by the Invention] In construction using the conventional rammer head as described above, the construction surface is almost flat, so a so-called "kakiyaburi" operation is always required.

That is, a steel rod with a sharp tip or a serrated metal tool must be used to roughen each stamp surface by making irregular streaks on it. This is because when further stamping is performed on this upper surface, the lower layer overlay surface and the upper stamp material blend well, integrating the multilayer construction and improving the corrosion resistance and abrasion resistance of the construction body.

If this overburdening work is omitted or cut short, the multi-layered construction will peel and float in layers during operation of the furnace, container, etc., shortening the life of the furnace, and sometimes molten steel and slag will form in the gaps between the layers. They can penetrate and even damage the outer shell of the hearth, causing dangerous hot water leaks.

However, this "kayaburi work" needs to be repeated many times over a wide area over the entire construction surface, and the stamping work must be interrupted each time, so not only does the entire construction process take a long time.
When working in narrow, groove-like areas such as the corners of ladle, there was a problem in that it was not possible to completely cover the deep part.

This idea was made to solve this problem, and even when stamping material is applied in multiple layers, the applied surface will not peel off due to the use of a furnace.
The purpose is to obtain a rammer head whose service life can be extended.

[Means for solving the problem] The rammer head according to this invention has protrusions or protrusions on the stamp surface, the height of which is 7 to 12 mm, and the number of protrusions arranged is one to several. It is.

[Function] In this invention, protrusions of various shapes and numbers are provided on the stamp surface depending on the stamping material and construction method, so when stamping is performed using these protrusions, appropriate depressions can be created on the stamp surface. Because of this, even if the stamp materials are laminated, the upper and lower layers will fit well together, and the entire construction will be firmly integrated.

〔Example〕

FIG. 1 is a perspective view showing one embodiment of this invention, in which numerals 1 and 2 are the same as the conventional one, and the first
The stamp surface shown in FIG. 1A is circular, and the stamp surface shown in FIG. 1B is square. 3 is a protrusion, which in this example has a cross section of 9 mm x 9 mm in the center of the stamp surface 2.
It is made of steel, the same material as the rammer head, and is integrally manufactured.

In the above embodiment, the cross-sectional shape of the protrusion is square, but the cross-sectional shape is not limited to rectangular, trapezoidal, trapezoidal, etc.
An appropriate shape, such as a hemispherical shape, can be selected depending on the material packing density of the stamp material.

FIG. 2 shows another embodiment, 4 and 5.
numeral 4 is a projection provided in the center of the stamp surface 2, and numeral 4 is a cylindrical, 5-headed right conical steel projection with a diameter of 8 mm and a height of 12 mm, which is fixed by welding.

Figure 3 shows a cylindrical protrusion 6 with a diameter of 7 mm and a height of 10 mm.
Figure 3a shows three stamps fixed at approximately equal intervals near the center of the circular stamp surface 2.
Figure 3b shows four stamps approximately 4 on the oval stamp surface 2.
It is placed in the corner.

Figure 4 shows three short protrusions 7 with square cross-sections arranged on the rectangular stamp surface 2, which are made of steel and have a cross-section height of 8 mm and width of 6 mm, which are integrated with the rammer head 1. It was manufactured in.

The protrusions and protrusions in this invention are not limited to being made of the same material as the rammer head main body, but may be made of a combination of different materials as necessary. For example, steel and hard rubber,
It may be made of steel and stainless steel, or vice versa, as long as they are fixed together.

In addition, if the height of the ridges and protrusions is less than 7 mm, the depressions formed on the surface of the stamp material after stamping will become shallow, making it difficult for the upper and lower stamp layers to fit in. If the height of the protrusions and protrusions exceeds 12 mm, the rammer head will be damaged during stamping work. When the stamp material rises, the stamp material is thrown up, making it impossible to form a good depression, which is undesirable.

Further, the width of the protrusions and protrusions (in the case of cylindrical shapes, the diameter) is preferably 8 to 10 mm in order to form good depressions.

Next, to explain the actual use of the rammer head for stamps according to this invention, the above-mentioned Fig. 1 a
Using the material shown in Figure 3 a, magnesia stamp material was conventionally installed in the gap between the side wall brick lining and the paving brick lining of the 30 ton ladle of Company A, i.e., at a location with a width of 100 mm and a depth of approximately 240 mm. Thickness approx.
It was stamped into 4 layers of 60 mm each and used after drying.

As a result, since no overburden work was required, the same amount of work could be completed in 23 minutes instead of 30 minutes previously. In addition, since there is no peeling of the stamp material or metal insertion during operation of the ladle, the ladle can now be used 30 times, compared to the conventional 25 times.

[Effects of the invention] As explained above, this invention has the simple structure of providing ridges or protrusions on the stamp surface of the rammer head, which reduces the working time by approximately 20% in the construction of stamp materials for monolithic refractories. In laminated stamping construction, the entire structure can be formed into a solid construction body, so there is no peeling, floating, etc. during use.
It has the effect of significantly improving durability as there is no need for metal inserts.

[Brief explanation of the drawing]

1 to 4 are perspective views showing embodiments of this invention, and FIG. 5 is a sectional view showing a conventional rammer head for a stamp. In each figure, 1... Rammer head, 2... Stamp surface, 3
... Protrusions, 4, 5, 6... Protrusions, 7... Short protrusions.

Claims (1)

[Scope of utility model registration request] A rammer head for stamps characterized by having one to several protrusions or protrusions with a height of 7 to 12 mm arranged on the stamp surface.