JPS5928320Y2 - Mortar press-fit nozzle - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mortar injection nozzle used for repairing the inner wall of a blast furnace.

Due to long-term use, part of the lining of the blast furnace inner wall may be damaged, partially depressed, and the wall thickness may become thinner or the steel shell may be exposed.

In such a case, a mortar repair wall is partially formed in the recessed part of the furnace inner wall to maintain the thickness of the furnace wall.

Mortar is injected from outside the furnace during repairs, so a hole for the nozzle is drilled in a designated damaged part of the furnace wall, the nozzle is inserted into the furnace through this hole, and the nozzle is inserted into the furnace. Mortar is press-fitted between the charged material such as coke and the furnace wall to form a secondary wall.

Conventional nozzles used for press-fitting mortar are either straight nozzles or umbrella-shaped nozzles with an umbrella-shaped tip.

After press-fitting the mortar, it is necessary to remove the nozzle, so even though it is an umbrella-shaped nozzle, the shape is not much different from that of a straight nozzle, and the tip of the nozzle may be inserted between the four charged materials. Therefore, the secondary wall formed by press-fitting mortar becomes a mortar wall containing coke, which is the contents in the furnace, and has a disadvantage in that it is inferior in strength.

Moreover, since various deposits are present on the surface of the inner wall of the furnace to be repaired, the life of the press-fit mortar is affected by the properties of the deposits, and the mortar layer may fall off along with the deposit layer. , the lifespan of the repaired wall is 7~
It took about 20 days.

The purpose of the present invention is to provide a mortar press-in nozzle that facilitates the formation of a secondary furnace wall to be formed in the repaired area and enables the formation of a long-life furnace wall, thereby improving the furnace wall repair technology. There is a particular thing.

The main points of this invention are to form a mortar wall free of contaminants by securing in advance the space necessary for forming a secondary wall in the repaired part of the furnace, and to use the nozzle used for press-fitting mortar as an anchor. This is done so that it remains on the furnace wall.

Hereinafter, the structure of the nozzle of the present invention will be specifically explained with reference to the accompanying drawings.

As shown in FIG. 1, the nozzle of the present invention consists of a cylindrical nozzle body and an opening/closing blade 2 integrally connected to the tip of the body.

The nozzle body 1 has a flange 11 integrally formed at its base end, and a sealing plug member 12 having a conical or bullet-shaped tip is integrally fitted and fixed at the insertion side tip.

Furthermore, a plurality of mortar discharge holes 13 are bored at uniform intervals along the circumferential direction on the peripheral surface of the tip side of the nozzle body.

The opening/closing blade 2 formed at the tip of the nozzle is a combination of a plurality of short shelf-shaped plates 21 (six in the embodiment shown in the drawings), and as shown in FIG. The plates 21 are combined into a cylindrical shape so as to surround the periphery, and the base end of each plate 21 is attached to the sealing plug 12 by a plate spring 22.

The leaf spring 22 has attachment parts at both ends of a short shelf, and is connected to the sealing plate 12.
and plate body 21, and although it is normally bent into an L shape, it is attached so that it can be deflected into a flat plate shape by elastic deformation, as shown in FIG.

The opening/closing blade 2 is made up of a plurality of plates 21 against the reaction force of the plate spring 22.
are assembled into a cylindrical shape, and a soluble or cutable belt 23 made of aluminum wire, aluminum thin plate, fiber cloth, string, etc. with a diameter of 1 mm or less is fitted into the tip of the collection, and the belt 23 is assembled to maintain the state shown in FIG. 1.

When the belt 23 is cut, the reaction force of the leaf spring 22 causes each plate body 21 to bend in the radial direction around the axis of the nozzle, so that the whole plate expands into an umbrella shape. (See Figure 4).

Next, how the nozzle of the present invention is used will be explained.

As shown in FIG. 3, first, a hole for inserting a nozzle and a flange 4 for fixing the nozzle are provided by penetrating the steel skin 31 of the damaged part of the furnace inner wall 3, and as shown in FIG. The nozzle main body 1, which remains focused, is inserted into the furnace through the hole in the flange 4.

When the nozzle tip is inserted into the furnace, the belt 23 is melted by the high heat in the furnace and the plate 21 is defocused.

Therefore, the opening/closing blades 2 expand radially as shown in FIG. 3.

When the nozzle body 1 is further pushed into the housing in this state, the opening/closing blade 2 becomes umbrella-shaped, displacing the furnace contents 5 and forming a certain space zone between it and the furnace inner wall 3.

In this state, the flange 11 of the nozzle and the flange 4 fixed on the furnace side are connected with bolts or the like, and with the nozzle fixed, mortar is press-fitted into the nozzle body.

The press-fit mortar is discharged from a discharge hole 13 provided at the front end of the main body into the furnace space as shown in FIG. 4, and is filled in the space zone to form the secondary furnace wall 6.

In this case, the secondary furnace wall is formed by filling a pre-formed space zone in the furnace, so there is no mixing of coke and other furnace contents, and a wall with a complete mortar layer is formed. .

After the secondary furnace wall is formed, the nozzle remains on the furnace wall as it is, continuing its function as an anchor for fixing the repaired wall.

The number and size of the opening/closing blades formed in the nozzle of the present invention are not particularly limited, and the material of the nozzle may be any metal or refractory material or any combination thereof.

In addition, when the repaired secondary wall falls off or is worn out due to subsequent use, it is assumed that the tip of the buried anchor will also be damaged, so it should not be left together with the flange. The nozzle can be pulled out.

Therefore, there is no problem in repairing by inserting a new nozzle.

According to the nozzle of the present invention, the repaired secondary furnace wall is made of pure mortar, and the press-in mortar can be spread and filled over a wide area, so the repair effect is high and the service life is about 30 to 60 days. It can be extended.

[Brief explanation of drawings]

Figure 1 is a side view of the mortar press-in nozzle according to the present invention before use, Figure 2 is a front view of only the tip of Figure 1 viewed from the direction of arrows II-II, and Figure 3 is for furnace wall repair. FIG. 4 is an explanatory view showing the operation immediately after insertion into the section, partially in cross section, and FIG. 4 is an explanatory view during filling with mortar. 1: Nozzle body, 2: Opening/closing blade, 3: Furnace inner wall, 4: Flange, 5: Furnace contents, 6: Secondary furnace wall (repair wall).

Claims (1)

[Scope of utility model registration request] A cylindrical nozzle body having a conical stopper attached to the tip on the side to be inserted into the furnace, a plurality of mortar discharge holes provided on the circumferential side of the tip, and a pushing flange formed in the rear part; A plurality of flat plates combined in a cylindrical shape along the axial direction around the stopper, and a plate spring connecting the proximal end of each flat plate to the sealing stopper, are combined to form a flat plate due to the elasticity of the iron plate spring. The entire structure consists of opening/closing wings that can be opened in the radial direction like an umbrella, and the opening/closing wings are bundled with a soluble belt and passed through the steel skin from the repair hole to the furnace. A mortar press-in nozzle characterized by inserting the mortar into the furnace, closing the blades in the furnace, and then press-fitting the mortar.