JP3022822U - Ladle for casting - Google Patents

Abstract

(57) [Abstract] [Purpose] By simplifying the lining work, drying work and dismantling work of the lining refractory layer, it is easy to replace the lining refractory layer and save labor, labor and energy. (EN) Provided is a ladle for casting which can realize durability improvement, safe work, and safety against molten metal leakage. [Structure] In a casting ladle comprising an outer shell 1 and an inner refractory layer 2, the inner refractory layer 2 comprises a permanent refractory layer 3 and a powdery refractory layer in order from the outer shell side. 4 and the refractory container layer 5, and the refractory container layer 5 is filled with a fixing refractory material 7 on the upper part of the powdery refractory material layer 4 to form the outer shell 1 through the permanent refractory material layer 3. Fixed to.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bottomed cylindrical or frustoconical casting ladle for accommodating molten metal such as molten cast iron, molten aluminum or molten copper alloy.

[0002]

[Prior art]

 Generally, casting ladle used for reaction, treatment, transportation and pouring of molten cast iron is made of refractory bricks and / or castable refractory such as loess on the side wall and floor of the outer shell. It is lined with an irregular shaped refractory such as refractory mortar and heated and dried.

[0003]

[Problems to be solved by the device]

 In the conventional technology, when refractory bricks are used, it takes a long time for a skilled worker to build bricks while processing them into different shapes in order to reduce the thickness of joints of refractory brick lining bricks. I am going. In addition, when lining with castable refractory, complicated work is required such as that a frame for molding must be provided inside the ladle, and it takes a long time to dry. If the refractory lining melts or cracks, repair the refractory material such as clay mortar or plastic refractory to repair the damaged parts. I am repairing the tension. In the conventional technology, there are many problems as follows even in a small capacity ladle.

Before using the molten metal injection, the inside of the ladle is preheated with a gas burner, etc., but if the molten metal is added when the lining refractory is not sufficiently dried, it will be included in the refractory. The water that flows in melts the molten metal, and if it is poured into the mold as it is, nests will form in the product. Therefore, it is necessary to perform the drying sufficiently, and this drying is spent for a long time.

In order to avoid a decrease in the temperature of the molten metal poured into the ladle, the inside of the ladle must be preheated until it becomes a red hot state before pouring. It takes more than time.

At the time of full tension repair, the lining refractory is disassembled, but the lining refractory is sintered due to contact with the molten metal, and it is difficult to destroy the lining refractory. When the metal invades the structure of the Zhang refractory, the dismantling machine such as a pick may not function and dismantling requires a lot of time and labor.

In any case, it takes a long time to cool the ladle sufficiently for relining or repairing the lining and disassembling.

Further, when the lining refractory after use is dismantled, ingots are often found in the refractory. Possible causes of ingots are intrusion of molten metal from brick joints due to damage to refractory mortar, layered cracks of irregular refractories, and cracks during drying.

On the other hand, an example of a ladle in which a refractory container is used as a lining material for the ladle and the container can be easily replaced is disclosed in Japanese Utility Model Publication No. 45-15228. In these ladles, a refractory container for containing molten metal and an outer metal container for holding the refractory container are individually configured and detachably locked and fitted to each other to prevent loss of molten metal. It is easy to replace the fireproof container. However, since this ladle remains a space between the refractory container and the metallic outer container, it has no heat insulation and insufficient safety against molten metal leakage. Is not the solution.

The present invention has been made for the purpose of eliminating the above-mentioned conventional problems.

[0011]

[Means for Solving the Problems]

 The above object of the present invention is to provide a casting ladle comprising a ladle shell and a lining refractory layer, wherein the lining refractory layers are laminated in order from the ladle shell side. A permanent refractory layer integrated with the outer shell, a powdery refractory material layer having an unfilled portion at the top of the layer, and a refractory container layer, wherein the powdery refractory material layer and the refractory container layer are It is characterized in that it is fixed to the outer shell through the permanent refractory layer by a fixing refractory that is filled and fixed in an unfilled portion above the powdery refractory layer. Achieved by a casting ladle.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a casting ladle according to the present invention comprises a ladle outer shell 1 and a lining refractory layer 2.

The lining refractory layer 2 is composed of a permanent refractory layer 3, a powdery refractory material layer 4 and a refractory container layer 5 which are sequentially laminated from the outer shell 1 side.

Of the lining refractory layer 2, the permanent refractory layer 3 is made of mortar, which is a mortar in contact with the outer shell 1 to lining the refractory brick, castable refractory, plastic refractory, and the like. Since this layer is a permanent lining layer, it is not necessary to make it fragile, and it is desirable that it has high strength and durability.

The powdery refractory material layer 4 is formed by filling a powdery refractory material between the bottom walls 3a and 5a and between the side walls 3b and 5b of the permanent refractory material layer 3 and the refractory container layer 5. However, the upper portion between the side walls 3b and 5b is left as a space as an unfilled portion 6.

As the powdery refractory material, a dry powdery refractory material having heat resistance, non-sintering property and heat insulation property is suitable, and it is a dry powdery material of silica sand, old sand for casting, ground chamotte, zircon sand. Fireproof materials are suitable.

The refractory container layer 5 is composed of a refractory container. The material of the refractory container is selected according to the type of molten metal. For example, in the case of molten cast iron, a silica crucible, an alumina crucible and a mullite crucible are suitable, and in the case of an aluminum melt and a copper alloy melt, a graphite crucible is suitable. Fire-resistant containers are molded by rubber press molding (cold isostatic molding), casting, vibration molding, stamp molding, potter's wheel molding, etc., and then dried after molding before use or after firing at low or high temperature before use. To serve.

The refractory 7 for fixing is filled and fixed in the unfilled portion 6 at the upper part of the powdery refractory material layer 4. The powdery refractory material layer 4 and the refractory container layer 5 are fixed to the outer shell 1 through the permanent refractory layer 3 by filling and fixing the refractory 7 for fixation in the unfilled portion 6. As a refractory for fixation, soda silicate, a thermosetting aluminum-based plastic that uses aluminum phosphate as a binder, a thermosetting refractory mortar that uses a clay as a binder, and an alumina that uses alumina cement as a binder. Castable refractories are suitable.

In the casting ladle of the present invention, the lining refractory layer 2 includes a refractory container layer 5 as the innermost layer. The refractory container layer 5 is composed of a refractory container, and since the refractory container is manufactured in a state where the refractory container is managed in a manufacturing plant, the refractory container layer 5 has higher heat resistance, spalling resistance, and molten metal resistance than the conventional lining refractory material. The corrosion resistance is excellent, the life of the refractory lining is extended, and the safety against leakage of molten metal is significantly improved. Although the refractory container itself is not easily broken, it can be easily disassembled by removing the powdery refractory material layer 4 and the fixing refractory material 7 around the refractory container. .

Further, since the powdery refractory material layer 4 forming the intermediate layer of the lining refractory layer 2 has fire resistance, leakage of the molten metal to the outside can be suppressed. In addition, during dismantling, it is easily broken because it is held in the form of powder or a weakly solid mass, and is therefore easily dismantled. Furthermore, since this powdery refractory material layer 4 has heat insulating properties, the time and labor required for drying after lining is significantly reduced, and the temperature inside the ladle is raised in a short time even during preheating before pouring. Energy saving effect.

[0022]

[Experimental Example 1] Inner diameter 900 mm Φ, height 900 mm outer shell iron crust 100 mm thick on the ladle floor and 30 mm thick on the inner peripheral wall with a high strength castable refractory (No. 3 in Table 1) and dried. Then, it was used as a permanent refractory layer. Dry silica sand containing 0.2% of boric acid powder was laid on the ladle floor to a thickness of 30 mm. Silica crucible-shaped refractory container (No. 1 in Table 1) or an alumina crucible-shaped refractory container (Table 1) formed by molding and drying after drying with an inner diameter of 690 mm Φ, an outer diameter of 750 mm Φ, and a height of 930 mm. Put No. 2) in the center of the ladle, and fill the space formed by the permanent refractory layer and the crucible-shaped refractory container with dry silica sand containing 0.2% boric acid powder, excluding the unfilled part at the top. did. On the other hand, the unfilled part was fixed with a thermosetting alumina plastic refractory (No. 4 in Table 1). Except for the permanent refractory layer construction, the wear-lined refractory layer construction work could be done easily in a very short time. Drying and preheating could be performed in a short time. This ladle was used for transporting 2 tons of molten cast iron. The dry silica sand developed an appropriate strength to fix the refractory container based on the solidification of boric acid and silica sand by receiving the heat of boric acid, so that the refractory container could be used without loosening during use. In addition, the silica sand after use was fragile and the refractory lining was easily dismantled.

[0023]

[Experimental Example 2] Inner diameter 760 mm Ф, height 670 mm outer shell iron skin 30 mm above the ladle floor and 30 mm thick on the lining wall. High strength castable refractory (No. 3 in Table 1) was lined and dried. Used as a permanent refractory layer. The ladle floor is filled with adiabatic chamotte shavings (thermal conductivity of 0.2 Kcal / mh ° C.) In a thickness of 30 mm, and a graphite crucible (No. 5 in Table 1 of Table 1) with an inner diameter of 560 mm Ф and an outer diameter of 660 mm Ф is put into it and permanent fire resistance. The space formed by the layer and the refractory container was filled with the insulating chamotte waste. The upper part of the graphite crucible was fixed with a thermosetting alumina plastic refractory (No. 4 in Table 1). Except for the permanent refractory layer, the wear refractory lining layer could be easily constructed in a very short time. Drying and preheating could be done in a short time. This ladle was used for holding and transporting the molten aluminum. After use, the chamotte layer and graphite crucible could be easily removed, and the refractory lining could be easily disassembled.

[0024]

[Table 1]

[0025]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects.

The lining work, the drying work, the preheating work and the disassembling work are simple and easy, and the labor and labor saving and the energy saving effect are great.

Further, since the refractory lining has a high durability, the number of metal ingots is reduced, the frequency of the lining work is reduced, and the load of the lining work can be reduced.

Further, even if a crack occurs in the refractory container, since there is the heat-insulating powdery refractory material layer and the permanent refractory layer, there is no risk of the molten metal leaking from the outer shell, and the work can be performed safely.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a ladle according to the present invention.

[Explanation of symbols]

 1 Outer shell iron skin 2 Inner refractory layer 3 Permanent refractory layer 4 Powder refractory material layer 5 Refractory container layer 7 Fixing refractory material 8 Molten metal

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kazuhiko Takahashi 5-3-35 Fujimi-cho, Higashimurayama-shi, Tokyo (72) Kazuo Kimura 1-85-2 Nishimiyashita, Ageo-shi, Saitama Sunhighs Tanaka No. 104

Claims (1)

[Scope of utility model registration request] 1. A casting ladle comprising a ladle shell and a lining refractory layer, wherein the lining refractory layers are laminated in order from the ladle shell side. A permanent refractory layer integrated with an iron skin, a powdery refractory material layer having an unfilled portion at the top of the layer and a refractory container layer, wherein the powdery refractory material layer and the refractory container layer are the powders. A ladle for castings, which is fixed to the outer shell through the permanent refractory layer by a fixing refractory material that is filled and fixed in an unfilled portion in the upper part of the layered refractory material layer. .