JP2007152353A - Thermal-insulating cover for ladle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal-insulating cover for ladle, such as molten iron, molten steel, used for iron-making, steelmaking processes, excellent in the thermal insulating performance which can manufacture at low cost and has light weight structure. <P>SOLUTION: The thermal-insulating cover has a main body and an opening/closing part, and the inner surface of the main body is covered to the whole surface thereof with a steel pipe fitted along the outer edge whole periphery thereof and plurality of steel pipes fitted by setting to almost concentric state as the above steel pipe, and the inner surface of the opening/closing part is covered to the whole surface thereof with a steel pipe fitted along the outer edge and fitting the linear steel pipes and further, the thermal-insulating sheet is stuck to the whole surface of the inner surface in the cover, and on the outer surface side of the steel pipe, a calorizing treatment is applied. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat insulating lid for a ladle such as hot metal and molten steel used in steel making and steel making processes, and particularly to a heat insulating lid that can be manufactured at a low cost and has a lightweight structure and excellent heat insulating performance.

  In continuous casting, molten steel is cast from a ladle through a tundish into a mold to form a slab. Since the temperature of molten steel falls during conveyance of a molten steel or during casting time, the pan lid 100 which shows an example of a top view (a) and sectional drawing (b) in FIG. 6 is attached to a ladle.

  The pan lid 100 is divided into a main body 110 and an opening / closing part 120. The main body 110 is provided with a sand inlet 300, and the opening / closing part 120 is supported by the main body 110 by the opening / closing support part 200.

  The casting time is usually 30 minutes to 1 hour, but if it is a long time, the temperature of the molten steel in the ladle will drop to a temperature that is not suitable for casting, and casting may not be completed. Various attempts have been made to maintain the molten steel temperature in the ladle such as by spraying a heat-insulating castable on the inner surface side of the steel plate.

  Patent Document 1 relates to a heating lid for a ladle, and describes that a heating element is installed on the inner surface of the heating lid for a ladle. As a heating element, a plate-like refractory that is heated by the combustion heat of combustible gas or an energizing heat generation is disclosed. It is disclosed that an exothermic temperature is preferably about 1000 ° C. or higher.

  Patent document 2 relates to a heat insulation lid of a molten metal container, and describes that a heat insulating material having a two-layer structure in which a molten metal side is refractory castable and a lid side is ceramic fiber is attached to the inner surface of the heat insulation lid.

Patent Document 3 relates to a heat retaining method for a ladle, in order to keep the temperature in the ladle above a certain temperature without removing the pan lid until after casting and receiving new molten steel, One of the two sand injection holes provided in the above is used as a burner outlet, and the other is used as an exhaust outlet.
Japanese Patent Laid-Open No. 5-57425 Japanese Utility Model Publication No. 7-26056 JP-A-9-277023

  By the way, in continuous casting, in order to improve productivity, it is required to increase the amount of molten steel used for one casting. On the other hand, the crane ability to transport a ladle filled with molten steel from a converter to a continuous caster is Since it is limited, it is not preferable to increase the weight of the ladle itself for the purpose of keeping warm.

Moreover, it is not preferable for operation that the structure of the ladle is complicated and expensive, and that it takes time and effort to perform maintenance and inspection. Difficult to achieve.
For example, as with the pan lid described in Patent Documents 1 and 2, it is possible to reduce the weight of the bulk material, but the material cost is very expensive. It is difficult to ensure the desired performance stably.
When spraying heat insulation castable on the inner surface of the pan lid, in order to obtain a heat insulation effect, the thickness is required to be about 100 to 150 mm, and the weight is about 5 tons. It is necessary to reduce the amount of molten steel inside.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a ladle warming pan lid that can be manufactured at low cost and can obtain a stable warming performance with a lightweight structure.

The object of the present invention can be achieved by the following means.
1. A heat insulating lid for a ladle characterized by covering the entire inner surface of the lid with a steel pipe.
2. A heating pan for a ladle composed of a main body and an opening / closing part, and the inner surface of the main body is covered with a steel pipe attached along the entire outer periphery of the ladle, and a plurality of steel pipes arranged in a concentric manner with the steel pipe A heating pan for ladle, wherein the inner surface of the open / close section is covered with a steel pipe attached along the outer edge thereof and a straight steel pipe.

  3. A heating pan for a ladle composed of a main body and an opening / closing part, the inner surface of the main body is covered with a steel pipe attached along the entire outer periphery of the ladle and a straight steel pipe, and the entire inner surface is covered with the outer edge of the opening / closing part A warming pot for ladle, characterized in that the entire surface is covered with a steel pipe attached along a straight line and a straight steel pipe.

4). A warming pot for a ladle comprising a main body and an opening / closing part, wherein the inner surface of the main body and the opening / closing part is covered with a plurality of steel pipes in an upright orientation and is entirely covered.
5. The heat insulation lid for ladle according to any one of 1 to 4, wherein a heat insulating sheet is pasted on the entire inner surface of the lid.
6). The heat insulation lid for ladle according to any one of 1 to 5, wherein the outer surface side of the steel pipe is subjected to a caroline treatment.

According to the present invention, compared with the case where the heat insulating castable is sprayed on the inner surface side of the pan lid, for example, the weight is reduced by about 35% and the weight by about 3.5 tons, and the amount of molten steel corresponding to the weight is increased. , Productivity can be significantly improved.
Further, it can be easily manufactured at low cost, and stable performance can be obtained, which is extremely useful industrially.

  The present invention is characterized in that the inner surface of the ladle lid is covered with a steel pipe over the entire surface, and a heat insulating effect is obtained by an air layer inside the steel pipe. Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic diagram illustrating the structure of a ladle lid according to one embodiment of the present invention, and (a) is a top view in which a portion of the lid is cut away to show the arrangement of steel pipes inside the lid, (B) is AA sectional drawing, (c) shows BB sectional drawing.

  In the figure, 1 is a ladle lid, 11 is a main body, 11a is an inner surface of the main body, 12 is an opening / closing portion, 12a is an inner surface of the opening / closing portion, 2 is an opening / closing support portion, 3 is a curved pipe attached to the inner surface of the main body 11. A straight pipe 4 attached to the inner surface 12a of the opening / closing part 12 denotes a sand inlet.

  The illustrated ladle warming pot 1 includes an opening / closing part 12 in which a part of a circular lid is cut out and a main body 11 in which the opening / closing part 12 is removed from the circular lid, and the opening / closing part 12 is an opening / closing support part 2. Is attached to the main body 1.

  The inner surface 11a of the main body 11 has a bent tube 3 in which a steel pipe is bent in a shape along the outer edge of the main body 11 arranged at the outermost part of the inner surface 11a, and the bent tube 3 bent in a similar shape to the bent tube 3 is provided. A plurality of substantially concentric circles are arranged to cover the entire surface (see FIG. 1B). Each bent pipe 3 is sealed at the start and end after bending, or after bending, the end of the pipe may be sealed regardless of whether the start and end are joined to form an annular structure. Then, only one end may be opened, or both ends may be opened.

  FIG. 2 is a view for explaining an example of a method of attaching the curved pipe 3 to the inner surface 11 a of the main body 11. A bolt 5 passing through the curved pipe 3 in the diametrical direction is passed through a hole processed in the main body 11 with a nut 6. tighten.

  The inner surface 12a of the opening / closing part 12 has a curved pipe 3 bent into a shape along the outer edge of the opening / closing part 12 arranged at the outermost part of the inner surface 12a, and a plurality of straight straight pipes 3a are provided in the enclosed region. A book is attached to cover the entire inner surface 12a (see FIG. 1B). In addition, the attachment method of the straight pipe 3a to the opening / closing part 12 is according to FIG.

  In the above description, the outermost surface of the inner surface 11a of the main body 11 and the inner surface 12a of the opening / closing portion 12 is the closest to the outer edge without losing the function as a lid when the ladle lid 1 is attached to the ladle body. Position.

In addition, mounting to cover the entire surface means that after installing the steel pipe, the necessary space to install the steel pipe and the extent to which the space caused by uneven shape among the multiple steel pipes remains has little effect on the heat insulation effect. Allow.
The main body 11 has a curved pipe 3 formed by bending a steel pipe in a shape along the outer edge at the outermost surface of the inner surface 11a, and a plurality of straight straight pipes are attached to the inner enclosed area. You may make it cover the whole surface of 11a.

  FIG. 3 is a view for explaining the structure of a ladle lid according to another embodiment of the present invention. FIG. 3A is a top view in which a portion of the lid is cut away to show the arrangement of the steel pipes inside the lid. b) is an AA cross-sectional view, and (c) is a BB cross-sectional view. In the figure, 3b is a short pipe having a short pipe length, and the same reference numerals as those in FIG.

  The illustrated ladle lid 1 is attached to the inner surface 11a of the main body 11 and the inner surface 12a of the opening / closing part 12 so as to cover the entire surface of the short tube 3b (see FIG. 3B).

  In the illustrated main body 11 of the ladle lid 1, the sand inlet 4 has a peripheral portion processed into a convex shape, and thus a long tube 3 c having a long pipe length is attached to the convex portion of the inner surface 11 a. The lengths of the short and long pipes are appropriately selected so as to obtain a desired heat insulating effect.

  4A and 4B are diagrams for explaining an example of a method of attaching the short pipe 3b (long pipe 3c) to the inner surface 11a (12a) of the main body 11 (opening / closing part 12), where (a) is a top view and (b) is a side view. The figure is shown.

  A cover 31a is attached to the tube end of a short tube 3b (long tube 3c) that stands upright on the inner surface 11a (12a), and a bolt 5 is inserted through the cover 31a, the short tube 3b (long tube 3c), and the main body 11 (opening / closing part 12). And tighten with the nut 6.

5A and 5B are views showing another embodiment of the present invention, in which FIG. 5A is a top view and FIG. 5B is a cross-sectional view. The ladle lid is structured to open and close as a whole, and an upright short tube 3b is attached over the entire inner surface of the lid.
If a heat insulating sheet is applied to the entire inner surface of the lid, the heat insulating effect is further improved, and if the outer surface side of the steel pipe is subjected to a carolizing treatment, the durability can be improved without impairing the heat resistance.
Although a heat insulation sheet will not be specifically limited if it is a heat resistant heat insulation sheet, For example, an alumina fiber bracket is used as a heat insulation sheet. A maximum use temperature of 1600 ° C., chemical components of Al ₂ O ₃ : 72.6%, SiO ₂ : 27.2% were used.
The calorizing treatment improves carburization resistance, oxidation resistance, and wear resistance by forming an alloy layer having a high aluminum concentration that is difficult to peel only on the surface. The treatment method is to fill the retort with the material to be treated (steel pipe) together with a permeation material containing a large amount of aluminum, and heat treat it to a high temperature to diffuse and permeate the aluminum, and the surface of the aluminum and the base material components. An alloy layer is formed.

In one embodiment of the present invention, (a) is a top view, (b) is an AA cross-sectional view, and (c) is a BB cross-sectional view. The figure explaining the attachment method of the curved pipe in the ladle lid which concerns on this invention, and a straight pipe. In other Example of this invention, (a) is a top view, (b) is AA sectional drawing, (c) is a figure which shows the attachment method of a short tube. The figure explaining the attachment method of the short pipe (long pipe) in the ladle lid concerning this invention. (A) is a figure which shows AA sectional drawing in the other Example of this invention. In the conventional example, (a) is a top view and (b) is a plan view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ladle lid 11 Main body 11a Inner surface of main body 12 Opening and closing part 12a Inner surface of opening and closing part 2 Opening and closing support part 3 Curved pipe 3a Straight pipe 4 Sand inlet 5 Bolt 6 Nut 100 Pot lid 110 Main body 120 Opening and closing part 200 Opening and closing support part 300 Sand Slot

Claims (6)

  A heat insulating lid for a ladle characterized by covering the entire inner surface of the lid with a steel pipe.   A heating pan for a ladle composed of a main body and an opening / closing part, and the inner surface of the main body is covered with a steel pipe attached along the entire outer periphery of the ladle, and a plurality of steel pipes arranged and installed substantially concentrically with the steel pipe. A heating pan for ladle, wherein the inner surface of the open / close section is covered with a steel pipe attached along the outer edge thereof and a straight steel pipe.   A heating pan for a ladle composed of a main body and an opening / closing part, the inner surface of the main body is covered with a steel pipe attached along the entire outer periphery of the ladle and a straight steel pipe, and the entire inner surface is covered with the outer edge of the opening / closing part A warming pot for ladle, characterized in that the entire surface is covered with a steel pipe attached along a straight line and a straight steel pipe.   A warming pot for a ladle comprising a main body and an opening / closing part, wherein the inner surface of the main body and the opening / closing part is covered with a plurality of steel pipes in an upright orientation and is entirely covered. The heat insulation lid for ladle according to any one of claims 1 to 4, wherein a heat insulating sheet is pasted on the entire inner surface of the lid. The heat insulating lid for a ladle according to any one of claims 1 to 5, wherein an outer surface side of the steel pipe is subjected to a carolizing treatment.

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