JPS6231840Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a construction method in which a slurry-like monolithic refractory is filled into a pre-prepared construction frame to construct a refractory layer such as a lining or lining. Regarding the equipment,
In particular, the present invention provides an improved construction device for injecting castable mixed with appropriate moisture into the construction frame, and also saves labor in construction.
The aim is to build a dense fireproof layer.

Conventional technology Conventionally, methods of filling a construction frame with slurry-like monolithic refractories or concrete to form a fireproof layer or concrete structure include:
Using the thixotropy of the muddy refractory described in Japanese Patent Publication No. 51-48132, which has a moisture content of 10% or less, which has been kneaded and deaerated in advance, the inner frame inside the ladle is vibrated. from the bottom of the container to the gap between the lined container and the lined container.
Vibration molding method for refractory lining of molten metal container pressure-filled with 3 kg to cm ² A method and device for promoting concrete stabilization that removes excess moisture or air in concrete by heating and vibration, as described in Japanese Patent Publication No. 13489/1989, connects a hopper and a conduit connected to a gear pump to a chimney. It is installed at the lower end of the steel shell, and inside the steel shell, cylinders are stacked up to the top to form an inner wall.
There is an injection molding method for cementitious viscous material, in which a gap is formed for press-fitting, and acid-resistant mortar is sequentially press-fitted upward from below using the pump.

Furthermore, when injecting slurry, a method was proposed in which the tip of the injection tube was placed below the liquid surface as described in JP-A-52-54716. Methods for preventing such defects have been proposed as described in Japanese Utility Model Publication No. 46-35252 and Japanese Utility Model Publication No. 45-21739.

However, the above method requires deaeration and vibration equipment, and, especially in large ladles, considerable pressure must be applied to force the muddy refractory into the upper part of the gap. Therefore, a large press-fitting device is required, and it cannot be carried out easily. The above method requires a large hood and deaerator for degassing. Like the above-mentioned methods, a large press-fitting device is required, and both methods have the disadvantage that they are difficult to implement easily.

In addition, the above-mentioned method targets a specific slurry mixed with a clay body as a reinforcing material, and the above-mentioned methods are arranged and constructed directly above the slurry surface without being immersed in the slurry surface. This method cannot be said to completely eliminate the various drawbacks of the conventional method, and the operation control is complicated.

Problems to be solved by the invention The inventors of the present invention have conducted various studies to solve all of the above-mentioned drawbacks, and have found that in the steel manufacturing industry, high-quality steel ingots are obtained by the bottom pouring ingot method. As a result of their research, they discovered that a dense fireproof layer can be obtained by eliminating the inclusion of air during injection, leading to the completion of this invention. By using extremely simple and well-known components, it is possible to construct slurry-like monolithic refractories, especially castables, without entraining (mixing) any air. Since the refractory layer (lining) can be precisely applied by quickly injecting it into the frame from the bottom to the top, the service life of the lining of ladle etc. can be greatly extended. .

Means for Solving the Problems Below, an example will be shown in which the device of the present invention is used to construct a large ladle for steel manufacturing.

The present invention will be explained in more detail based on the drawings, but the present invention is not limited to this in any way, and as necessary, it can be applied to a hot metal ladle, a tap trough, various molten metal containers, and a vacuum degassing container. It can also be applied to the construction of refractory layers for various types of kilns and chimneys, such as suction pipes, continuous casting tundishes, and heating furnaces, and chemical industrial furnaces.

In the accompanying drawings, 11 is a can body to which lining is applied, and 12 is an inner frame. The base 21 of the device of the present invention is installed on the bottom of the inner frame. A support column 22 is provided on this base 21 via a rotation mechanism 17,
The injection tube main body 4 is supported on the upper part of the column via a support arm 25. The support arm 25 is the support column 22
horizontal position adjustment mechanism 28 and telescopic mechanism 2 provided in
9 are combined, and at the tip of the support arm 25 there is an elevating mechanism 24 consisting of a rack 26, a pinion 23, etc., and serves as a mechanism for elevating the injection tube body 4. The injection tube 4 is in communication with an immersion injection tube 4' via a vibration absorbing tube 30, and a detector 32 equipped with a float 31 is attached to the injection tube body 4. Indicator 18 on the outside wall
and a vibrator 20 are attached. In the figure, 1 is a monolithic refractory, 2 is a gap, 3 is a refractory pressure-feeding hose, 6 is a tip of an immersion injection pipe 4', and 10 is a liner.

The means for constructing the monolithic refractory 1 using the apparatus of the present invention having the above configuration will be described below.

A disc-shaped base 21 that can be placed stationary at the bottom of the inner frame 12
A support 22 that can freely rotate forward and backward is erected by a turning mechanism 17, and a horizontal position adjustment mechanism 28 is attached to this.
A support arm 25 equipped with a telescopic mechanism 29 is combined in a cross shape, and the injection tube 4 can be automatically raised and lowered by a lifting mechanism 24 provided at the tip.

In order to prevent the vibrations of a small vibrator 20 attached near the lower end of the injection tube 4 from being transmitted to the main body, a vibration absorbing tube 30, such as a soft rubber tube, is interposed in the middle.

In addition, in order to avoid the trouble of keeping an eye on whether the tip end 6 of the immersion injection pipe 4' is always immersed in the monolithic refractory 1 to a desired depth during the pouring operation, the desired rate of rise is determined in advance. A detector 32 having a float 31 is attached to the injection pipe 4 which is remotely controlled, and its vertical movement is detected by a well-known electric circuit (not shown). Automatically adjusts the pumping amount.

As mentioned above, the explanation was based on the procedure for simply constructing one layer of fireproof layer using the device of the present invention. , insulating castable is injected using the same procedure to form an insulating fireproof layer (lining).
Then, by using an inner frame 12 with a slightly smaller radius than the inner frame 12 and injecting a fire-resistant castable in the same way to construct a fire-resistant layer (lining), a so-called two-layer structure or necessary Depending on the situation, you can freely construct a fireproof layer with three or more layers,
Of course, it can be applied not only to the side walls but also to the flooring.

Activate the refractory pressure pump (not shown),
The monolithic refractory 1 is injected while the tip 6 of the submerged injection pipe 4' is always immersed in the slurry-like monolithic refractory 1 in the gap 2 by at least its diameter.

The inner frame 12 may be one that has been conventionally used in the stamp construction method or slinger (projection) construction method for ladle lining.

Further, the horizontal cross-sectional shape of the inner frame 12 is generally as follows.
A circular type with a similar shape is used, which allows a gap 2 of a certain fixed size (construction thickness) to be provided between the side wall and the steel skin, but it is difficult to prevent corrosion, especially on the slag discharge side or hot water area. Alternatively, for areas with large wear and tear, a D-shaped type can be used to partially increase the construction thickness. In that case, lining 1
It is better to provide an appropriate sealing material (not shown) to prevent the slurry-like monolithic refractory material 1 from leaking from between the holes.

In addition to the above construction frames, there are also long top-opening types used for constructing tap troughs, flat plate types used for constructing side walls of heating furnaces (both inner frames), and A cylindrical item (outer frame) used for constructing the outer periphery of a suction pipe or other tubular body of a vacuum degassing vessel, and especially a locally damaged part of a tap trough or ladle, is covered from the inside for repair purposes. There is a type (simple frame) that forms a gap 2 into which the monolithic refractory 1 is injected.

Next, the optimum moisture for pressure feeding and construction is added to the well-known monolithic refractory 1 in advance, and the mixture is kneaded with a mixer to form a slurry, which is then put into the hopper (not shown) of a general pressure pump. A relatively long steel injection pipe ((right circular pipe)), which is connected to the pressure pump and is connected to a well-known flexible pressure hose 3 with a rotary joint in the middle, is vertically inserted from above. Or insert it slightly diagonally according to the taper of the can body 11,
As shown in the figure, the tip 6 is lined with lining 10 as much as possible.
and temporarily fix it.

In addition to the above, the injection pipe 4 may be made of various materials such as aluminum or vinyl chloride, and the cross section may be a (regular) polygon, an ellipse, or an ∞.
One or more of the shapes (diameter and length) that match the dimensions of the gap 2 can be arbitrarily used.

In addition, for example, when the gap 2 is relatively low, such as in a tundish, the pressure feed hose 3 can also be used as the injection pipe 4 by fixing it to an angle iron of a required length with a steel band or the like.

In addition, when the slurry-like monolithic refractory 1 is gradually injected into the gap 2, the tip 6 is always injected into the monolithic refractory 1 into the gap 2 at least its diameter (average (including the diameter or apparent diameter) is preferably immersed.

In other words, the above measures were taken based on the idea that in order to prevent air from entering during injection, it is best to avoid contact with air as much as possible, and if the immersion depth is less than the diameter (shallow), The injected monolithic refractory 1 violently moves up and down (vibrates) around the outer periphery of the injection pipe 4, and air is mixed in, making the side wall lining porous and reducing its durability.

Therefore, it is better to immerse the tip 6 as deep as possible than the diameter of the injection tube 4, but generally, while watching the indicator 18 provided on the tip 6 from above, dip the tip 6 to a depth 2 to 3 times deeper than the diameter of the injection tube 4. While immersed, the injection pipe 4 is intermittently or continuously raised by remote control using the lifting mechanism 24, and if necessary, manually moved slowly in the circumferential direction, and the monolithic refractory 1 is Fill the gap 2 evenly.

Of course, in order to increase the packing density, a small vibrator 20 fixedly installed below the immersion injection tube 4' is activated as appropriate.

The monolithic refractory 1 used in the operation of the device of the present invention includes all materials that have appropriate fire resistance, fluidity and viscosity that can be pumped by a pressure pump, and can be poured. Castables for pouring (including insulating castables) Highly fluid plastic refractories with added deflocculants, or high-alumina mortar for local repairs can be used, but for ladle use, Generally, a slurry made by adding 10% by weight of water to a castable of about 60% alumina and kneading it is used.

If necessary, after injecting and curing castable of the above material below the slag line using the same procedure, a well-known high-alumina or silicon carbide castable with high corrosion resistance is added to the slag line. It can also be injected to create a more durable sidewall lining.

Effects of the invention As explained in detail above, the device of the present invention is dense and completely free of air (apparent porosity is 20% lower than conventional) by skillfully combining extremely simple components. It is extremely useful in the steel industry in that it is possible to quickly construct a fireproof layer that is large and durable (25% life extension) with labor savings (40% reduction).

Furthermore, if a top-opening inner frame is installed in a tap trough with damaged lining and the like and repaired using the same procedure, it will be possible to save labor in repair work and reduce the unit consumption of refractories.

[Brief explanation of the drawing]

The accompanying drawing is a schematic front view showing one example of the device of the present invention. In the figure, 1... Monolithic refractory, 2... Gap, 3
...Pressure hose, 4...Injection pipe body, 4'...Immersion injection pipe, 6...Tip, 10...Bed lining, 11
... Can body, 12 ... Inner frame, 17 ... Swivel mechanism, 1
8... Indicator, 20... Vibrator, 21... Base,
22... Support column, 23... Pinion, 24... Lifting mechanism, 25... Support arm, 26... Rack, 2
8... Horizontal position adjustment mechanism, 29... Telescopic mechanism, 3
0... Vibration absorption tube, 31... Float, 32...
Detector.

Claims (1)

[Scope of utility model registration request] In a construction device that constructs a refractory layer by injecting a slurry-like monolithic refractory into a gap formed by a construction frame or the like while the injection pipe is immersed, the injection pipe is connected to the injection pipe via a vibration absorbing pipe 30. It consists of a main body 4 and an immersion injection tube 4', a detector 32 having a float 31 is attached to the injection tube main body 4, and an indicator 18 and a vibrator 2 are attached to the outer wall of the immersion injection tube 4'.
Monolithic refractory construction equipment equipped with 0.