JP2002039688A - Castable wet type spraying method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize uniform construction of a wet type spraying apparatus that performs blowing construction on a wall surface of a molten metal container and the like with improved noise operation property and with reduced material loss and variations of the same. SOLUTION: An internal diameter of a castable pressure feed hose 13 located just near a spraying nozzle 11 of a castable wet type spraying apparatus 10 and an inlet internal diameter of the spraying nozzle are formed into a cylindrical configuration with a fine diameter of 35 to 45 mm for bringing the weight of the spraying nozzle section to light weight. Further, a throwing tube 14 for an additive is connected at an inclination angle of 30 to 90 degree with respect to the spraying nozzle 11, an outlet diameter of a throttle section 15 at the tip end of the spraying nozzle 11 is set 22 to 32 mm, and the length of the throwing tube 14 for an additive from the connection of the tube to the outlet of the blowing nozzle 11 is set 100 to 600 mm. The amounts of the additive and the amount of compression air for pressure feed of the castable are set 1.0 to 4.0 m3/minute inn the case of a liquid additive and 2.0 to 5.0 m3/minute in the case of powder additive, both variably, and air pressure is supplied with an air source of 0.2 to 0.55 Mpa.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet spraying apparatus and a method for spraying castables such as blast furnace gutters, mixed iron wheels, ladles, converters, tundishes, linings of electric furnaces and incinerators in steelworks in the field of refractories. It is about.

[0002]

2. Description of the Related Art In recent years, by developing castable refractories and improving their quality, castables are sprayed onto linings of blast furnace gutters, mixed iron wheels, ladles, converters, tundishes, electric furnaces and incinerators of steelworks. Construction and repair.

As shown in FIG. 1, the castable wet spraying apparatus 1 comprises a castable pump 2, an additive pump 3, an additive pumping and blowing air source 4 (air compressor or factory air), a castable pump hose 5, It comprises an additive feed hose 6, an air feed hose 7, a spray nozzle 8, and the like.

[0004]

However, the spray nozzle 8
And the castable pressure-feeding hose 5 filled with castables is heavy, the work load on the nozzle operator at the time of spraying is large, the material loss such as nozzle dripping and rebound is large, and the fluctuation is large. .

[0005] The above problem is that there are many factors that affect the shape of the spray nozzle, the amount of compressed air, and the other material loss. Even if the material loss during construction increases, it cannot be controlled, the loss is small, and the nozzle loss is small. There has been a need for a castable wet spray device and a spray method that are easy to operate.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in order to solve the above-mentioned problems, a castable is pressure-fed, and an additive is mixed by a spray nozzle and spraying is performed. Castable wet spraying apparatus and spraying method, wherein the inner diameter of a castable pressure-feeding hose immediately adjacent to the spraying nozzle and the inner diameter of the inlet of the spraying nozzle are reduced to 35 to 45 mm in a small cylindrical shape to reduce the weight of the spraying nozzle portion, Is connected to the spray nozzle at an inclination angle of 30 to 90 degrees, and the outlet diameter of the narrowed portion at the tip of the spray nozzle is 22 to 32.
mm, and the length from the connection of the additive supply pipe to the outlet of the spray nozzle is set to 100 to 600 mm.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The castable wet spraying apparatus and method according to the present invention provide a castable wet spraying apparatus in which a castable is pressure-fed, an additive is mixed with a spraying nozzle, and spraying is performed. The inner diameter of the hose, the inner diameter of the inlet of the spray nozzle is 35-45 mm, and the weight of the spray nozzle portion is reduced by making it a small-diameter tube, and the additive supply pipe is connected to the spray nozzle at an inclination angle of 30-90 degrees, The outlet diameter of the throttle at the tip of the spray nozzle is 22 to 32.
mm and the length from the connection of the additive introduction pipe to the outlet of the spray nozzle is set to 100 to 600 mm for spraying.

[0008] The castable wet spraying device 10 is shown in FIG.
The inner diameter of the nozzle inlet 12 of the spray nozzle 11 is 35
To a small-diameter cylinder having a diameter of about 45 mm,
The inner diameter of the castable pressure-feeding hose 13 closest to
The diameter is 5 mm, which is 25 to 30% smaller than the conventional inner diameter of 48 to 52 mm to reduce the weight and facilitate the nozzle operation.

In addition, an injection pipe 14 for the additive is provided at the rear of the spray nozzle 11 with respect to the spray nozzle 11.
It is desirable to connect at an inclination angle of up to 90 degrees and feed the additive.

FIG. 3 shows the means for introducing the additive.
(A) to (e) as shown in the injection position of the spray nozzle 11,
Prototypes with different throw angles are selected and compared by comparing nozzle performance. As a result, as shown in Table 1, FIG.
C type can be determined to be good in all of the castable drool, rebound loss, reaching state, nozzle closed state, and mixing condition.

Based on the C-shaped spray nozzle, the nozzle performance was confirmed by changing the injection angle of the additive injection pipe 14 as shown in FIGS. 4 (a) to 4 (d). as a result,
As shown in Table 2, when the input angle is 20 degrees, the mixing condition is not good, nobody stands out, and it can be used when the inclination range is 30 to 90 degrees. However, there is no input angle of 45 degrees and the mixing condition is good. desirable.

Table 1 Method of adding additives, position and nozzle performance

[Table 1]

Table 2 Additive injection angle and nozzle performance

[Table 2]

Further, as shown in FIGS. 5 (a) to 5 (f), the throttle state of the throttle portion 15 for nozzle discharge is changed with respect to the spray nozzle 11 in which the additive injection pipe 14 is at a 45 ° angle. It was confirmed. As a result, as shown in Table 3, it is preferable to use the outlet portion 15 having an outlet diameter of 20 to 32 mm because the nozzle clogging and dripping are small. In particular, about 28 mm is preferable because it has no spread and good spread.

Table 3 Nozzle throttle part and nozzle performance

[Table 3]

Further, as shown in FIGS. 6 (a) to 6 (e), the nozzle length of the spray nozzle 11 having the additive inlet pipe 14 at an inclination angle of 45 degrees and the outlet diameter of the nozzle throttle section 15 of 28 mm is variously changed. Performance was confirmed. As a result, as shown in Table 4, the total nozzle length of 700 mm is too long and is difficult to handle, and the total nozzle length of 230 mm is short and easy to handle, but blockage is likely to occur. A length of 100 to 600 mm after the additive introduction portion to the spray nozzle 11 can be used without causing nozzle blockage, and a material having a length of 500 mm after the addition of the additive has a small material loss and a good reach. It is preferable because it can be applied to a wide range of upward, lateral, and downward.

Table 4 Nozzle length and performance

[Table 4]

As shown in FIG. 6 (d), when the additive is introduced by providing an additive inlet 16 having a length of 150 mm after injection of the additive and a 45-degree conical shape in the spray nozzle 11 at a 45-degree angle. The overall length of the nozzle can be reduced to about 300 mm, and it is light and easy to handle. In addition, it is preferable because it can be spread easily and can be sprayed from a short distance sideways.

The spraying nozzle 11 of the type shown in FIG. 6 (d), which obtains the above-described best results, is connected to a castable pump 17 via a castable pressure hose 13 as shown in FIGS. It is connected to the additive pumping machines 19 and 20 via a body or liquid additive pumping hose 18, respectively, and is connected to an air compressor 23 or an air source 23 of a factory air via an auxiliary air hose 22 for the additive pumping air hose 21. And the discharge amount of the castable is 65Kg / min and the air pressure is 0.5Mpa
The performance was confirmed by spraying a castable on a required construction body while changing the air flow rate and the additive rate of the additive. This can be performed without using the auxiliary air hose 22 as shown in FIG.

Table 5 Relationship between compressed air volume and loss etc.

[Table 5]

As a result, under the condition that the material loss is small, as shown in Table 5 and FIGS.
From the degree of attainment, the porosity of the construction body, etc., 2.0 to 5.0 m3 / min for powder additives and 1.0 to 5.0 m3 / min for liquid additives.
It is preferable to perform the work within a range of 4.0 m3 / min. By determining the adjustment range of the air flow rate in this manner, a uniform work with little change in the amount of material loss can be performed.

The castable should be 50 to 150 kg /
Can be pumped in minutes, the conventional 80-180K
It is desirable not to increase the pumping resistance compared to the pumping amount of g / min.

The castable pressure feeder 17 may be of a piston-cylinder type, a squeeze type, or the like, and can be variably supplied within the above-mentioned pressure-feeding amount range by hydraulic flow rate control and rotation speed control. Further, as the additive pumping machines 19 and 20, the powder is made by rotary cutting, the air is pumped, and the liquid is made into a fixed discharge pump or the like. Can be.

The throttle portion 15 of the spray nozzle 11 can be made of a metal material such as stainless steel, iron steel, light alloy steel or the like, as shown in FIG. Further, as shown in FIG. 11B, a narrowed portion 23 made of a rubber material such as urethane rubber can be further attached to the end of the predetermined narrowed portion 15. Also, as shown in FIG.
May be made into a short tube, and a 45-degree conical annular injection hole 25 is formed around the additive mixing section 24 so that the powder and liquid additives can be used both.

[0025]

FIG. 7 shows an embodiment of the wet spraying apparatus 10 according to the present invention, which is to be tested on the inner wall surface of a mixed iron car. On the basis of the above results, the spray nozzle 11 sets the angle of the powder additive supply pipe 14 of FIG. 3B at 45 degrees, the inner diameter of the nozzle pipe 40 mm, the total nozzle length 700 mm, the nozzle outlet diameter 28 mm, the additive supply section. The subsequent length was 500 mm, and required devices were connected as shown in the figure.

The pressure of the castable air is set to 0.5 MPa, and the amount of air to be pumped is set to 2.0 to 5.0 m 3 /
The air regulators 26 and 27 were adjusted within the range of minutes. The additive gives fluidity to the castable, imparts shape retention of the construction body, and is used as a quick-setting material to be hardened. The castable has the quality shown in Table 6, and the added moisture is 8.5.
%, The free flow value was 190.

As a result, the weight of the spray nozzle and the pressure-feeding hose for castable filling, which the operator of the nozzle bears, is 9-1.
0Kg, which makes nozzle operation easier, compared to 14
Since it was 17 kg, the work load of 30% or more was reduced. In addition, the material loss becomes 5 to 7%,
It could be reduced from １３13% to about 50%.

Table 6 Castable Quality Table

[Table 6]

Further, the amount of compressed air is 2.0 to 5.0 m3.
By controlling within the range of / min, spraying work with less fluctuation of material loss can be performed, and the quality of the work body can be made uniform.

FIG. 8 shows a test blast furnace gutter according to another embodiment of the present invention, which has the same spray nozzle 11 as described above.
, And a liquid additive was introduced, and the air supply amount was adjusted by an air regulator 27 within a range of 1.0 to 4.0 m3 / min.

As a result, as in the previous embodiment, the operability of the spray nozzle was good, the material loss was small, and the spraying operation with little change in the material loss was performed.

In addition, when the additive of the powder is introduced, as shown in FIG.
As described above, the construction can be performed based on known means such as reducing the number of the auxiliary air hoses 22 from the air source 23.

[0033]

As described above, according to the present invention, the weight of the spray nozzle can be reduced, the nozzle operability can be improved, the additive can be mixed well, and the castable material loss can be reduced. Can be sprayed uniformly.

The amount of compressed air for pressure-feeding the additives and castables is set to 1.0 to 4.0 m3 / m2 for liquid additives.
Min, in the case of a powder additive, it is variably formed as 2.0 to 5.0 m3 / min, and by supplying the air pressure at 0.2 to 0.55 MPa, it is possible to carry out spraying with little change in material loss, The quality of the construction body is made uniform.

Further, by attaching a throttle portion made of a synthetic resin such as rubber, urethane, nylon, or the like to the tip of the spray nozzle, material loss can be reduced by using an appropriate nozzle discharge cylinder corresponding to the quality of the castable. It is possible to perform spraying work with little fluctuation of the construction, and to make the quality of the construction body uniform.

[Brief description of the drawings]

FIG. 1 is a schematic view for explaining a general castable wet spraying device;

FIG. 2 is a schematic diagram for explaining a castable wet spraying device of the present invention,

3 (a) to 3 (e) are diagrams for explaining selection of an injection position of an additive for a spray nozzle;

FIGS. 4A to 4D are diagrams for explaining selection of an injection angle of an additive of a spray nozzle;

FIGS. 5A to 5F are diagrams for explaining selection of a throttle at a nozzle discharge portion of a spray nozzle;

FIGS. 6A to 6E are diagrams for explaining the selection of the length of the spray nozzle after adding the additive,

FIG. 7 is a schematic view of a castable wet spraying apparatus using a powder additive according to one embodiment of the present invention;

FIG. 8 is a schematic view of a castable wet spraying apparatus using a liquid additive according to another embodiment of the present invention;

FIG. 9 is a schematic view of a castable wet spraying apparatus using a liquid additive according to another embodiment of the above,

10 (a), a drawing for comparing bending strength (b), a drawing for compressive strength comparison (c),

FIG. 11 is side sectional views (a), (b), and (c) of the spray nozzle usable in the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Wet spraying apparatus 11 ... Spray nozzle 12 ... Nozzle inlet 13 ... Castable pressure feeding hose 14 ... Additive supply pipe 15 ... Restrictor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuaki Muroi 2576 Kawasaki Furnace Materials Co., Ltd. at 1576 Nakahiro, Higashioki, Ako City, Hyogo Prefecture (72) Inventor Seijiro Tanaka Higashioki, Aki City, Hyogo Prefecture F-term (reference) at Kawasaki Reactor Co., Ltd. at 1576 4F033 QA01 QB03Y QB05 QD03 QD16 QF07Y QF15Y QH02 QH10 4K002 BC02 4K013 CF12 CF13 CF19 4K015 EC08 4K051 AA01 AA02 AA05 AA06 LA02 LA14

Claims (4)

[Claims] 1. A castable wet spraying device for pressure-feeding castables, mixing additives with a spraying nozzle and spraying the mixture, wherein the inner diameter of the castable pressure-feeding hose and the inner diameter of the spraying nozzle near the spraying nozzle are 35. The weight of the spray nozzle part is reduced as a small-diameter tube of up to 45 mm, the additive injection pipe is connected to the spray nozzle at an inclination angle of 30 to 90 degrees, and the outlet diameter of the throttle part at the tip of the spray nozzle is reduced. 22. A castable wet spraying device, wherein the length from the connection of the additive introduction pipe to the outlet of the spray nozzle is 100 to 600 mm. 2. A rubber, urethane,
2. The castable wet spraying device according to claim 1, wherein a throttle portion made of a synthetic resin such as nylon is attached. 3. A castable wet spraying method in which a castable is pressure-fed, an additive is mixed with a spraying nozzle, and spraying is performed, wherein an inner diameter of a castable pressure-feeding hose and an inner diameter of an inlet of the spraying nozzle in the immediate vicinity of the spraying nozzle are 35. ~ 45mm
The weight of the spray nozzle part is reduced as a small-diameter cylindrical shape, the additive supply pipe is connected to the spray nozzle at an inclination angle of 30 to 90 degrees, and the outlet diameter of the narrowed part at the tip of the spray nozzle is 22 to 32 mm, the length from the connection of the additive introduction pipe to the outlet of the spray nozzle is 100 to 600 mm, the castable pump for pumping the castable is variable in supply amount, and the additive for supplying the additive is used. A castable wet spraying method in which the supply amount is also variable and the spraying is performed. 4. The amount of compressed air for pressure feeding of additives and castables is variable as 1.0 to 4.0 m3 / min for liquid additives and 2.0 to 5.0 m3 / min for powder additives. 4. The method of claim 3, wherein the air pressure is supplied at 0.2 to 0.55 MPa.