JP6639941B2 - Gas blowing equipment - Google Patents

Description

  The present invention relates to a gas blowing device for blowing a gas into a molten metal container. Specifically, the upper mass brick disposed in the refractory at the bottom of the molten metal container, the lower mass brick disposed between the upper mass brick and the steel shell of the molten metal container, and attached to the upper mass brick. A gas blowing plug accommodated in the molten metal container, a plurality of pressing bricks for pressing a lower end surface of the gas blowing plug, and a press for pressing the plurality of pressing bricks held by the steel shell upward. The present invention relates to a gas blowing device having a metal fitting.

  Conventionally, at the bottom of a molten metal container such as a ladle for steelmaking, a gas injection plug (porous plug or slit plug) for blowing gas into the molten metal, and a plug receiving brick (mass) for mounting the plug. Bricks). Since the brick at the bottom of the molten metal container has a large thickness, the mass brick is composed of an upper mass brick whose upper surface is in contact with the molten metal and a lower mass brick whose lower surface is in contact with the iron shell.

  When the life of the gas injection plug expires, the plug is removed from the mass brick at the bottom of the molten metal container and replaced with a new one.

  As shown in FIG. 4, the conventional gas blowing device includes an upper mass brick 10 disposed in a refractory at the bottom of a molten metal container, and a lower mass brick disposed between the upper mass brick 10 and a steel shell 30. The brick 20, the gas blowing plug 40 mounted on the upper mass brick 10, the plurality of pressing bricks 50 for pressing the lower end surface of the gas blowing plug 40, and the plurality of presses held by the iron shell 30. A press fitting 60 for pressing the brick 50 upward is provided (for example, see Patent Document 1).

  The upper mass brick 10 has a truncated conical upper mass through hole 11 in which an upper portion to which the gas injection plug 40 is attached is formed. The lower mass brick 20 has a lower mass through hole 21 coaxial with the upper mass through hole 11 and having the same opening as the lower end opening 11 a of the upper mass through hole 11.

  An iron shell opening 31 having the same opening as the lower mass through hole 21 is also formed in the iron shell 30. An opening is formed in the holding brick 50 and the holding metal fitting 60 to insert a pipe 42 for supplying gas to the gas blowing plug 40.

  Metal discs 60 a, 60 b, 60 c, and 60 d smaller in diameter than the iron-sheath opening 31 are arranged between the flat holding metal fitting 60 and the holding brick 50. By adjusting the thickness of the plurality of metal discs 60a, 60b, 60c, and 60d, when the presser fitting 60 is bolted to the iron cover 30, the plug 40 is pressed upward and the plug is mounted without a gap. Can be.

  The joint 70 of the gap between the outer peripheral surface of the plug iron cover 41 that covers the gas injection plug 40 and the inner peripheral surface of the upper mass through hole 11 of the upper mass brick 10 is usually filled with refractory mortar. Similarly, the joint 70 of the gap between the lower end opening 11a of the upper mass through hole 11 and the inner peripheral surface of the lower mass through hole 21 of the lower mass brick 20 and the outer peripheral surface of the holding brick 50 is also filled with fireproof mortar. . The mortar joint of the gap between the inner peripheral surface of the lower mass through hole 21 and the outer peripheral surface of the holding brick 50 may be omitted.

JP 2004-183041 A

  As described above, since the conventional gas blowing device is based on the premise that the plug is replaced, the lower end opening 11a of the upper mass brick 10 and the lower mass through hole 21 of the lower mass brick 20 are coaxial and have the same opening. 70 is a so-called “through joint” that extends vertically. Therefore, in the conventional gas blowing device, when the molten steel permeates through the mortar joint, the molten steel reaches the iron shell 30 and the presser fitting 60 and is welded, making it difficult to replace the plug. When the metal fitting 60 is melted, steel leakage occurs.

  The present invention has been made in view of the above problems, and provides a gas blowing device in which even if molten steel permeates through a mortar joint between a mass brick and a gas injection plug, the molten steel does not easily reach a holding metal fitting. The task is to

  A gas blowing device according to the present invention made in order to solve the problem, an upper mass brick disposed in the bottom refractory of the molten metal container and between the upper mass brick and the iron shell of the molten metal container. The lower trough brick and the truncated cone shaped gas blowing plug for blowing gas into the molten metal contained in the molten metal container mounted on the upper mass brick and the lower end surfaces of the gas blowing plugs It has a plurality of pressing bricks to be pressed and a holding metal fitting held by the steel skin and pressing the plurality of the pressing bricks upward.

  In the above gas blowing device, the upper mass brick has a truncated cone-shaped upper mass through hole at least in an upper portion where the tip of the gas injection plug is mounted, and the lower mass brick has the upper mass penetrating hole. A lower mass through hole coaxial with the hole and having a lower mass through hole wider than the lower end opening of the upper mass through hole, and a lower end holding brick located at the lowermost end of the plurality of holding bricks, is slightly different from the inner peripheral surface of the lower mass through hole. It has a ring-shaped upper surface portion that abuts the outer peripheral surface that separates the gap and the lower surface portion of the upper mass brick that is exposed in the lower mass through hole, or faces with a slight gap.

  In the above gas blowing device, the ring-shaped upper surface of the lower end holding brick has a ring-shaped convex portion, and the lower surface of the upper mass brick facing the ring-shaped upper surface with a slight gap therebetween. Preferably has a ring-shaped concave portion for receiving the convex portion.

  In the above gas blowing device, when a truncated cone-shaped gas injection plug and a plurality of holding bricks are inserted into the truncated cone shaped upper mass through hole and the lower end holding brick is pressed upward by the holding metal, the pressing force is reduced. Preferably, the thickness of the plurality of holding bricks is set so as to act on the lower surface of the gas blowing plug. That is, the ring-shaped upper surface of the lower-end holding brick and the lower surface of the upper-mass brick exposed in the lower-mass through-hole abut or face each other so that the pressing force of the holding metal acts on the lower surface of the gas blowing plug. Good to do.

  The lower end holding brick is in contact with the outer peripheral surface, which separates a small gap from the inner peripheral surface of the lower mass through hole of the lower mass brick, and the lower surface portion of the upper mass brick, which is exposed in the lower mass through hole, or faces with a slight gap. Even if the molten metal flows into the lower end holding brick from between the upper mass brick and the gas injection plug, the molten metal flows into the lower mass portion of the upper mass brick because The lower end holding brick can be prevented from contacting with the ring-shaped upper surface to prevent the holding metal from coming into contact with the molten metal.

It is a sectional view of a gas blowing device concerning Embodiment 1 of the present invention. It is sectional drawing of the gas blowing device which concerns on Embodiment 2 of this invention. It is sectional drawing of the gas blowing device which concerns on Embodiment 3 of this invention. It is sectional drawing of the conventional gas blowing device.

  Hereinafter, embodiments for carrying out the invention will be described in detail with reference to the drawings.

(Embodiment 1) As shown in FIG. 1, a gas blowing apparatus according to the present embodiment includes an upper mass brick 1 disposed in a refractory at the bottom of a molten metal container, and an upper mass brick 1 and an iron mass of the molten metal container. A lower mass brick 2 disposed between the skin 3 and a gas injection plug 4 for blowing gas into the molten metal mounted on the upper mass brick 1 and contained in the molten metal container; A plurality of holding bricks 5 for pressing the lower end surface of the plug 4 and a holding metal fitting 6 held by the steel shell 3 and pressing the plurality of holding bricks 5 upward are provided.

  The upper mass brick 1 is formed with a truncated cone-shaped upper mass through hole 1a at least in an upper portion where the tip of the gas injection plug 4 having a truncated cone shape is mounted.

  The lower mass brick 2 is formed with a lower mass through hole 2a coaxial with the upper mass through hole 1a of the upper mass brick 1 and wider than the lower end opening 1ak of the upper mass through hole 1a.

  The lower end holding brick 51 located at the lowermost end of the plurality of holding bricks 5 is exposed to the outer peripheral surface 51a and the lower mass through hole 2a which are separated from the inner peripheral surface of the lower mass through hole 2a of the lower mass brick 2 by a slight gap. The upper mass brick 1 has a ring-shaped upper surface portion 51b which is in contact with the lower surface portion 1b of the upper mass brick 1 or faces with a slight gap therebetween.

  Holding bricks 52 and 53 having an outer peripheral surface slightly smaller than the lower end opening 1ak of the upper mass brick 1 are mounted between the gas blowing plug 4 and the lower end holding brick 51.

  The presser fitting 6 is made of, for example, iron and has a convex sectional shape, and the upper surface of the convex portion 6 a is in contact with the lower surface of the lower end press brick 51.

  By attaching the holding metal member 6 to the steel shell 3 with bolts, the space between the lower surface of the gas injection plug 4 and the upper surface of the holding brick 53, between the lower surface of the holding brick 53 and the upper surface of the holding brick 52, The respective thicknesses are adjusted so that there is no gap between the lower surface and the upper surface of the holding brick 51 and between the lower surface of the holding brick 51 and the upper surface of the holding metal member 6.

  The holding brick 5 and the holding metal fitting 6 are formed with openings through which a pipe 42 for supplying gas to the gas blowing plug 4 is inserted.

  The joint 7 of the gap between the outer peripheral surface of the plug iron cover 41 covering the gas injection plug 4 and the inner peripheral surface of the upper mass through hole 1a of the upper mass brick 1 is filled with refractory mortar. Similarly, the joints 7 at the other gaps are also filled with the refractory mortar.

  In the gas blowing device of the present embodiment, the gap between the outer peripheral surface of the plug shell 41 of the gas injection plug 4 and the outer peripheral surfaces of the holding bricks 52 and 53 and the inner peripheral surface of the upper mass through hole 1 a of the upper mass brick 1. The joint 7 filled with the refractory mortar is substantially vertical and is a so-called "through joint", but is filled with the refractory mortar in the gap between the lower surface portion 1b of the upper mass brick 1 and the ring-shaped upper portion 51b of the lower end holding brick 51. Since the joint 7 is substantially horizontal, even if the molten metal flows into the lower end holding brick 51 from between the upper mass brick 1 and the plug shell 41 of the gas injection plug 4, the flowing molten metal is moved upward. Blocking between the lower surface 1b of the mass brick 1 and the ring-shaped upper surface portion 51b of the lower end holding brick 51 prevents contact between the holding metal 6 and the molten metal.

  (Embodiment 2) The gas blowing device of the present embodiment is different from the gas blowing device of Embodiment 1 in the upper mass brick and the holding brick. The same components are denoted by the same reference numerals, and description thereof will be omitted.

  As shown in FIG. 2, the lower end holding brick 81 of the gas blowing device of the present embodiment has an outer peripheral surface 81 a and a lower mass through hole 2 a separated from the inner peripheral surface of the lower mass through hole 2 a by a small gap. It has a ring-shaped upper surface portion 81b which is in contact with the lower surface portion 1Ab of the exposed upper mass brick 1A or faces it with a slight gap.

  The ring-shaped upper surface portion 81b has a ring-shaped convex portion 81b1, and the lower surface 1Ab of the upper mass brick 1A that is in contact with the ring-shaped upper surface portion 81b or faces with a slight gap therebetween is a ring-shaped concave portion that receives the convex portion 81b1. 1Ab1.

  The holding brick 8 of the gas blowing device according to the present embodiment includes a lower end holding brick 81 and holding bricks 82, 83, 84, 85, 86, and 87 stacked thereon. As described above, the gas blowing device of the present embodiment has a large number of holding bricks having different thicknesses, and the truncated cone-shaped gas injection plug 4 and the truncated cone-shaped gas blowing plug 1A When a plurality of different holding bricks 82 to 87 are inserted and the lower holding brick 81 is pressed upward by the holding metal 6, the pressing force acts on the lower surface of the gas blowing plug 4, and the ring-like shape of the upper mass brick 1 </ b> A is formed. The concave portion 1Ab1 comes into contact with or faces the ring-shaped convex portion 81b1 of the lower end holding brick 81. When the pressure acting on the lower surface of the gas blowing plug 4 is weak, the thickness of the holding bricks 82 to 87 laminated on the lower end holding brick 81 is adjusted.

  In the gas blowing device of the present embodiment, the gap between the outer peripheral surface of the plug shell 41 of the gas injection plug 4 and the outer peripheral surfaces of the holding bricks 82 to 87 and the inner peripheral surface of the upper mass through hole 1Aa of the upper mass brick 1A. The joint 7 filled with the refractory mortar is almost vertical and is a so-called "through joint", but is filled with the refractory mortar in a gap between the lower surface portion 1Ab of the upper mass brick 1A and the ring-shaped upper portion 81b of the lower end holding brick 81. Since the joint 7 has a mountain shape, when the molten metal flows into the lower end holding brick 81 from between the upper mass brick 1 </ b> A and the plug shell 41 of the gas injection plug 4, the molten metal Can be prevented between the ring-shaped concave portion 1Ab1 of the upper mass brick 1A and the ring-shaped convex portion 81b1 of the lower end holding brick 81, so that the contact between the holding metal 6 and the molten metal can be reliably prevented.

  (Embodiment 3) The gas blowing device of the present embodiment is different from the gas blowing device of Embodiment 1 in the upper mass brick and the holding brick. The same components are denoted by the same reference numerals, and description thereof will be omitted.

  As shown in FIG. 3, the lower end holding brick 91 of the gas blowing device of the present embodiment has an outer peripheral surface 91 a and a lower mass through hole 2 a separated from the inner peripheral surface of the lower mass through hole 2 a by a small gap. It has a ring-shaped upper surface portion 91b which is in contact with the lower surface portion 1Bb of the upper mass brick 1B to be exposed or faces with a slight gap.

  The ring-shaped upper surface portion 91b has a ring-shaped V-groove 91b1, and the lower surface 1Bb of the upper mass brick 1B that is in contact with the ring-shaped upper surface portion 91b or faces with a slight gap therebetween is a ring-shaped protrusion that enters the V-groove 91b1. The unit 1Bb1 is provided.

  The holding brick 9 of the gas blowing device of the present embodiment includes a lower end holding brick 91 and holding bricks 92, 93, 94, 95, 96, and 97 stacked thereon. As described above, the gas blowing device of the present embodiment has a large number of holding bricks having different thicknesses, and the gas injection plug 4 having the shape of a truncated cone is formed in the upper mass through hole 1Ba having the shape of a truncated cone. When a plurality of different holding bricks 92 to 97 are inserted and the lower holding brick 91 is pressed upward by the holding metal fitting 6, the pressing force acts on the lower surface of the gas blowing plug 4, and the ring-shaped upper surface of the lower holding brick 9. The ring-shaped V-groove 91b1 of the portion 91b comes into contact with or faces the ring-shaped protrusion 1Bb1 of the upper mass brick 1B. When the pressure acting on the lower surface of the gas injection plug 4 is weak, the thickness of the holding bricks 92 to 97 stacked on the lower end holding brick 91 is adjusted.

  In the gas blowing device of the present embodiment, the gap between the outer peripheral surface of the gas injection plug 4 and the outer peripheral surfaces of the holding bricks 92 to 97 and the inner peripheral surface of the upper mass through hole 1Ba of the upper mass brick 1B is filled with the refractory mortar. The joint 7 is substantially vertical and is a so-called "through joint". However, the gap between the lower surface portion 1Bb of the upper mass brick 1B and the ring-shaped upper surface portion 91b of the lower end holding brick 91 is bent in a V-shape. When the metal flows into the lower end holding brick 91 from between the upper mass brick 1B and the gas injection plug 4, the flowing molten metal is prevented by the V-shaped gap, and the contact between the holding metal 6 and the molten metal is ensured. Can be prevented.

  The present invention is not limited to the embodiment described above and shown in the drawings, and can be implemented with appropriate modifications without departing from the scope of the invention.

1, 1A, 1B,..., Upper mass brick 1a, 1Aa, 1Ba,... Upper mass through hole 1ak,..., Bottom opening 1b, 1Ab, 1Bb・ Lower surface part 1Ab1 ・ ・ ・ ・ ・ ・ ・ ・ ・ Ring-shaped recess 2 ・ ・ ・ ・ ・ ・ Lower mass brick 2a ・ ・ ・ ・ ・ ・ Lower mass penetration Hole 3 ・ ・ ・ Steel of molten metal container 4 ・ ・ ・ Plug 5,8,9 for gas injection ······· Pressing bricks 51, 81, 91 ······· Bottom end pressing bricks 51a, 81a, 91a ··· Outer peripheral surface 51b, 81b, 91b ··· Ring-shaped upper surface portion 81b1 ··· ... Ring-shaped convex part 6

Claims (2)

The upper mass brick disposed in the refractory at the bottom of the molten metal container, the lower mass brick disposed between the upper mass brick and the steel shell of the molten metal container, and the molten metal attached to the upper mass brick. A gas blowing plug for blowing gas into the molten metal contained in the container, a plurality of pressing bricks for pressing a lower end surface of the gas blowing plug, and a plurality of bricks held by the steel shell. A press fitting for pressing the press brick upwards, comprising:
The upper-mass brick has an upper-mass through hole to which a tip of the gas injection plug is attached and at least an upper portion has a truncated cone shape,
The lower mass brick has a lower mass through hole coaxial with the upper mass through hole of the upper mass brick and wider than a lower end opening of the upper mass through hole,
The lower end holding brick located at the lowermost end of the plurality of holding bricks is exposed on the outer peripheral surface of the lower mass brick, which is separated from the inner peripheral surface of the lower mass through hole by a slight gap, by the lower mass through hole. It has a ring-shaped upper surface facing the lower surface of the upper mass brick with an abutment or a slight gap,
If the molten metal flows into the lower end holding brick from between the upper brick and the gas blowing plug, the molten metal flowing into the lower holding brick and the ring shape of the lower holding brick are removed. A gas blowing device that blocks between the upper surface portion and the contact between the holding metal and the molten metal. The ring-shaped upper surface portion of the lower end holding brick has a ring-shaped convex portion, and the lower surface of the upper mass brick facing the ring-shaped upper surface portion or facing with a slight gap receives the convex portion. The gas blowing device according to claim 1, wherein the gas blowing device has a concave portion.