JP2580835Y2 - Structure of flange joint of molten metal processing equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a flange joint of a molten metal processing apparatus.

[0002]

2. Description of the Related Art Molten metal processing equipment such as RH-type vacuum degassing equipment, DH-type vacuum degassing equipment, and CAS equipment are divided vertically by flanges to facilitate repair and replacement of refractory lining. I can do it. For example, in the case of a vacuum degassing apparatus, there are divisions such as a dip tube and a reflux tube, and an upper tank and a lower tank.

FIG. 4 is a sectional view showing a conventional structure of a flange 2 joint between an upper tank 8 and a lower tank 9 in a vacuum degassing apparatus. The refractory 1 is lined with a heat insulating material 10 inside the steel shell 5. The lowermost brick 3 on the upper side of the joint of the flange 2 has a role of a stopper so that the refractory 1 of the upper tank 8 does not fall off when the lower tank 9 is removed from the flange 2. Therefore, the concave portion 4 is provided on the back side of the lowermost brick 3.
The metal fitting 6 projecting from the inner peripheral surface of the steel shell 5 is
, The lowermost brick 3 is locked. For example, as seen in Japanese Utility Model Publication No. 48-30816.

[0004]

Problems to be Solved by the Invention The lowermost brick 3 of the upper tank 8 can be used as shown in FIG.
1 and 12 occur. The cause of the occurrence of the crack 11 extending from the concave portion 4 is that the stress from the metal fitting 6 increases in the concave portion 4 of the lowermost brick 3 due to the load from the refractory lining 1. In addition, the sharpness 12 at the lower end of the lowermost brick 3 inside the device is caused by a difference in expansion due to a temperature gradient. Then, when the lower tank 9 is removed, the adhesive strength of the mortar interposed between the bricks also acts, and the lowermost brick 3 becomes sharp 11
The lower part is removed from. Conventionally, the patch portion is repaired with a patching material or the like, but there are problems such as economical cost such as repair material cost and construction man-hours, and a reduction in the operation rate of the apparatus due to the time required for repair. An object of the present invention is to solve the above-mentioned conventional problems in a flange joint of a molten metal processing apparatus.

[0005]

The present invention will be described with reference to the drawings of the embodiment. In a molten metal processing apparatus provided with a vertically removable flange 2 lined with a refractory 1 and joining the flange 2 to each other. A concave portion 4 is provided on the back surface of the lowermost brick 3 on the upper side of the portion, a metal fitting 6 projecting from the inner peripheral surface of the steel shell 5 is fitted into the concave portion 4, and the outer periphery of the lowermost brick 3 is attached to the device. Surround with metal hoop 7 at right angles to the center of
And the metal hoop 7
The structure of the flange joining portion of the molten metal processing apparatus, characterized in that no surrounding is performed .

[0006]

[Function] The metal hoop 7 surrounding the lowermost brick 3 is
It is interposed between the lowermost bricks 3 and has a role as a joint material. Since the metal hoop 7 has an extremely large expansion coefficient as compared with a refractory material such as mortar, the metal hoop 7 acts as an expandable joint material, and the force of pressing the lowermost bricks 3 in the circumferential direction increases. As a result, the lowermost brick 3 is firmly fixed, and the effect as a stopper for supporting the upper refractory 1 is further increased.

Further, since the lowermost brick 3 is firmly fixed, the stress from the metal fitting 6 is reduced in the concave portion 4 of the lowermost brick 3, and the generation of the crack 11 starting from the concave portion 4 is prevented. In long-term use, the occurrence of cracks based on the recess 4 is still unavoidable. Also,
Due to the difference in expansion due to the temperature gradient, there is no effect on the occurrence of cracks at the lower end of the lowermost brick inside the device. To solve this problem, the metal hoop 7 according to the present invention has the effects of suppressing the expansion of the lowermost brick even if it occurs, and preventing the brick from falling off.

The present invention surrounds the metal hoop 7 with respect to the lowermost brick 3 at the flange joint as described above. Do not go through the entire refractory lining.
If performed on the entire refractory lining, the thermal conductivity of the metal hoop 7 causes problems such as a decrease in the temperature of the molten metal and deformation of the steel shell 5.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments. FIG. 1 is a cross-sectional view of a main part for describing an embodiment of the present invention, taking a flange joint portion of a vacuum degassing device as an example. FIG. 2 shows an enlarged perspective view of the lowermost brick 3 in FIG. The refractory 1 is lined inside the steel shell 5 via the heat insulating material 10, a recess 4 is provided on the back surface of the lowermost brick 3, and the metal fitting 6 projecting from the inner peripheral surface of the steel shell 5 is attached to the recess 4. By locking the lowermost brick 3 by fitting it into the conventional structure, there is no difference from the conventional structure. The metal fittings may be provided not only on the back of the lowermost brick 3 but also on the upper part as shown in the figure, and may support the heat insulating material 10 and the like above it. Although not shown in the figure, for example, the heat insulating material 10 is a combination of a heat insulating board and a heat insulating brick, and the refractory 1 of the lining is made into two layers of permanent lining and wear lining. It is not limited.

Although the lowermost brick 3 is made of a brick material, the refractory 1 above it or the refractory in the lower tank 9 may be made of an irregular refractory. In the embodiment of the present invention,
The outer periphery of the lowermost brick 3 is surrounded by a metal hoop 7 at a right angle to the center of the device. The thickness of the metal hoop 7 is, for example, 0.1 to 3 mm, preferably 0.5 to 2 mm. Thin ones may be wound multiple times. Although not shown in the figure, multiple windings may be performed while shifting a thin or linear object. The surrounding position is preferably closer to the rear surface to avoid being far from the operating surface.

Lowermost brick 3 surrounding metal hoop 7
Is most effectively provided in the entire circumferential direction of the device, but it may be intermittently arranged in the circumferential direction of the device, for example, by alternately providing one that surrounds the metal hoop 7 and one that does not. Good. Further, the metal hoop 7 cannot be provided on the entire refractory lining because problems such as a decrease in the temperature of the molten metal and deformation of the steel shell 5 occur. It may be surrounded by a hoop 7.

The shape of the concave part 4 on the back side of the lowermost brick 3 is determined according to the shape of the metal fitting 6 projecting from the steel shell 5.
For example, if the metal fitting 6 is rod-shaped, a concave hole may be used. In FIGS. 1 and 2, the metal fitting 6 has a plate shape that is continuous in the circumferential direction of the iron shell 5, and the rear recess 4 is also formed in a groove shape in accordance with this.

FIG. 3 is an enlarged perspective view of the lowermost brick 3 when the shape of the rear recess 4 is different from the above. When the position of the metal fitting is located below, the rear recess 4 may be a notch provided on the rear lower surface as shown in FIG. Further, the lowermost bricks 3 surrounding the metal hoop 7 may be integrated by welding the metal hoop 7.

The present invention was tested at the joint of the flange 2 between the upper tank 8 and the lower tank 9 in the RH type vacuum degassing apparatus of 250 t capacity. FIG. 2 shows a metal hoop 7 having a thickness of 1.2 mm and a width of 100 mm on the lowermost brick 3 made of magnesia-chromium fired brick having a working surface side of 98 × 300 mm, a back side 133 × 300 mm and a length of 412 mm. And the seams were partially overlapped and welded. The concave portion 4 on the back side is also in the form of a concave groove similar to that shown in FIG. 2, and has a groove width of 40 mm and a depth of 105 m.
m. As a result, the occurrence of cracks in the lowermost brick 3 is extremely reduced, and even when the cracks occur due to long-term use, the number of times of use until the scabs are dropped is at least smaller than that of the conventional example not surrounding the metal hoop 7. More than doubled. Although the above description has been made mainly of the case of a vacuum degassing apparatus, the present invention can be similarly applied to a flange joint in a CAS apparatus or the like.

[0015]

[Effects of the Invention] As described above, according to the present invention, the problem of cracking and slashing of the lowermost brick at the flange joint is improved, so that the cost of repair material and the number of construction steps are reduced, and molten metal processing is performed. The effect is great, such as improvement in the operation rate of the entire device.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of the lowermost brick shown in FIG.

FIG. 3 is an enlarged perspective view of a lowermost brick according to another embodiment of the present invention.

FIG. 4 is a sectional view showing a structure of a flange joint portion of a conventional vacuum degassing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refractory 2 Flange 3 Bottom brick 4 Concave part 5 Steel shell 6 Metal fitting 7 Metal hoop 8 Upper tank 9 Lower tank 10 Heat insulation material 11 Kiretsu 12 Kiretsu

Continuing on the front page (72) The creator Manabu Kimura 1-3-1 Shinhama, Arai-machi, Takasago City, Hyogo Prefecture Inside Harima Ceramics Co., Ltd. (72) The creator Michio Fukuoka 1-3-1 Shinhama, Arai-machi, Takasago City, Hyogo Prefecture Harima Ceramics (56) References JP-A-61-38773 (JP, A) JP-A-59-181854 (JP, U) JP-A-61-120750 (JP, U) JP-A-59-37324 (JP, A) Y2) (58) Field surveyed (Int. Cl. ⁶ , DB name) C21C 7/10 C22B 9/04 F27D 1/14

Claims (1)

(57) [Scope of request for utility model registration] 1. A molten metal processing apparatus provided with a flange 2 which is lined with a refractory 1 and which is vertically detachable.
A recess 4 is provided on the back surface of the lowermost brick 3 on the upper side of the joint of the flange 2, and a metal fitting 6 protruding from the inner peripheral surface of the steel shell 5 is fitted into the recess 4. When the outer periphery is surrounded by a metal hoop 7 at a right angle to the center of the device,
And surrounding the metal hoop 7 for the entire lining
The structure of the flange joint of the molten metal processing apparatus, wherein the process is not performed .