JPH07278625A - Forced feeding device for refractory gunning - Google Patents

Abstract

PURPOSE:To economically obtain a highly finished refractory wall surface while utilizing life of a tube pump and cancelling pulse of discharge pressure by using plural tube pumps having different rotating phase. CONSTITUTION:Plural pumps 2, 3, in which tubes 31, 32 having an appropriate elasticity and flexicibility and transferring a slurry refractory are placed as curved in a specific curvature, these tubes 31, 32 are sequentially pressed/ deformed by plural pushing rollers arranged to a rotatable rotor from one end to the other end side, the slurry refractory in the tubes 31, 32 is forcedly feeded, are arranged. Further, a refractory is respectively discharged from plural tube pumps 2, 3, by a pump unit 1 structured to rotate the tube pumps 2, 3 in a specific rotational phase, is joined by a joining means 20 and is supplied to a gunning nozzle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractory material spraying operation for spraying a slurry-like refractory material onto a surface to be sprayed such as an inner surface of a blast furnace, which is required to have a fire resistance, to construct a required refractory wall surface. The present invention relates to a pressure-feeding device for sequentially pressure-feeding air to a spray nozzle.

[0002]

2. Description of the Related Art Heretofore, in the case of constructing a wall surface such as an inner surface of a blast furnace which is required to have fire resistance, it has been general to successively stack refractory bricks formed in a rectangular block shape to obtain a fire resistant wall surface. However, the construction of such a refractory wall by the laminated refractory brick method is poor in workability because the refractory bricks are stacked one by one by hand, and the refractory bricks are in the shape of a rectangular block. There was a problem in the construction of the above because the degree of freedom in construction was low and the curved surface shape that could be constructed was restricted.

From such a background, in recent years, attention has been paid to the construction of a refractory wall surface by a refractory material spraying method. This method of spraying a refractory material is a slurry of a refractory material having the required composition and is sprayed onto the surface to be sprayed using a spray nozzle to form a refractory layer to build the required refractory wall surface. The workability is far superior to that of the refractory brick stacking method, and even when constructing a curved refractory wall surface, the surface to be sprayed, which is the base, is hardly affected by the curved surface shape. It is considered that it will become the mainstream of the future method for constructing a refractory wall because it is possible to reliably obtain a refractory wall conforming to the shape.

By the way, in constructing a refractory wall by such a refractory material spraying method, it is necessary to sequentially pump slurry-like refractory material to a spray nozzle. As a pumping device for this purpose, conventionally, a spiral-shaped refractory material is generally used. A so-called uniaxial eccentric pump has been used in which an impeller provided with blades is housed in a casing and is rotated to perform a pressure-feeding operation. The reason why such a uniaxial eccentric pump is frequently used as a pressure-feeding device for spraying refractory material is that there is almost no pulsation of the discharge pressure in this uniaxial eccentric pump, and that there is no pulsation in the discharge pressure, the spraying amount is made uniform. This is because it was suitable for obtaining a good fire resistant wall surface without spraying unevenness.

[0005]

However, when such a uniaxial eccentric pump is used for pumping a refractory material, since the refractory material contains relatively large particles due to its composition, the uniaxial eccentric pump is not worn. It was extremely severe and increased operating costs due to an increase in consumables, and frequent replacement work of worn parts was required, and there was a certain limit in terms of workability.

Under the circumstances, there has been a strong demand in the related industry for the development of a pumping device having good durability. As a means for responding to this, a tube pump, which has already been well-established in terms of durability, has been established as a means for responding to this demand. It can be used as a device. Although the basic principle of this tube pump is well known, it is the following as it is a basic technology of the present invention and is briefly described. That is, as shown in FIG. 2, in the tube pump 50, a rubber having appropriate elasticity and flexibility is provided in a casing 51 having an inner peripheral surface 51a having a curved surface of a U-shaped cross section having an arc surface. A tube 54 made of a material such as the above is arranged along the inner peripheral surface 51a of the casing, and a rotor 54 rotated by a drive shaft 53 provided at the center of curvature of the inner peripheral surface 51a of the casing.
Extrusion rolls 55 and 56 are attached to both ends of
When the rotor 54 rotates, the pair of extrusion rolls 5
5, 56, the tube 52 is configured so as to be sequentially pressed and deformed from one end side to the other end side, and the pressing deformation point of the tube 52 gradually shifts as the rotor 54 rotates. The object to be pressure-fed in 52 is sequentially pressure-fed. Therefore, in the tube pump 50, the object to be pressured only contacts the inner surface of the tube 52 and does not contact the casing 51 or the extruding rolls 55 and 56, so that the object to be pressured relatively promotes wear. Even if it contains large particles, high durability is ensured regardless of this.

However, in this tube pump,
Although a high level of durability can be expected as described above, the pulsation of the discharge pressure is large due to its structure. Therefore, when this is used as a pressure-feeding device for spraying refractory material, there will be more uneven spraying and a finished state. It is difficult to obtain a good fire resistant wall.

Therefore, the present invention makes it possible to secure the durability of the apparatus and reduce the pulsation of the discharge pressure at the same time, and thus to obtain a refractory wall surface for spraying a refractory material which has a low operating cost and can obtain a refractory wall surface with a good finishing accuracy. It was made as an offer.

[0009]

In the present invention, as a concrete means for solving such a problem, a refractory material spraying operation for sequentially pumping slurry-like refractory material sprayed onto a surface to be sprayed by a spray nozzle. In the apparatus, a tube having appropriate elasticity and flexibility, into which the refractory material is supplied, is arranged in a curved shape with a predetermined curvature, and the tubes are sequentially rotated by a plurality of extrusion rolls provided on a rotor driven to rotate. A pump unit configured to provide a plurality of tube pumps for pressure-feeding the refractory material by pressing and deforming the tube from one end side to the other end side, and configured to rotate the plurality of tube pumps at a predetermined rotation phase. And the refractory materials discharged from the plurality of tube pumps of the pump unit are merged and sent to the spray nozzle. Is characterized in that a converging means for.

[0010]

According to the present invention, the following operation can be obtained with this structure.

That is, when each tube pump is operated, a slurry refractory material is discharged from each of the tube pumps. In this case, the tube pumps rotate with a predetermined rotation phase, and The refractory material discharged from each tube pump joins in the joining means and is pressure-fed to the spray nozzle side, so that even if each of these tube pumps alone causes a relatively large pressure pulsation in the discharge pressure, In the above, the pressure pulsations peculiar to the tube pumps interfere with each other, the discharge pressures of the refractory material after merging are averaged, and the pressure pulsations are reduced. Therefore, when the refractory material is pressure-fed to the spray nozzle in a state where the pressure pulsation is small, the spray amount of the refractory material sprayed from the spray nozzle toward the surface to be sprayed is also averaged, and the layer thickness of the refractory material varies. Thus, a refractory wall surface having a so-called non-uniform sprayed refractory material layer is formed.

Further, in this case, since each tube pump has a characteristic that it is originally excellent in durability, the discharge action of the refractory material by each tube pump is maintained well for a long period of time, and the reliability of the reliability is improved. Along with the realization of high refractory material spraying work, longer work intervals and lower operating costs will be promoted due to the longer replacement intervals.

Therefore, according to the pressure-feeding apparatus for spraying refractory material of the present invention, the pressure pulsation of the discharge pressure, which is the greatest drawback when the tube pump is applied as the pressure-feeding apparatus for spraying refractory material, is applied to the tube. Since a plurality of pumps are provided and these can be eliminated as much as possible by rotating them with a predetermined rotation phase, while effectively utilizing the high durability which is the greatest advantage of the tube pump. In addition, it is possible to reliably obtain a good fire-resistant wall surface without spraying unevenness under high workability and to reduce the operating cost.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pumping device for spraying a refractory material according to the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a pumping device Z used for spraying a refractory material according to an embodiment of the present invention. A hopper 15 and a spray nozzle 25 are shown as devices associated therewith.

The pumping device Z has a known structure (see FIG. 2).
The pump unit 1 composed of a pair of tube pumps 2 and 3 having the above, and the tube pumps 2 and 3 composing the pump unit 1 having the tapered pipe 20 as a confluent means are casings 2a and 3a, respectively. The tubes 31 and 32 are arranged inside in a curved state, and a rotor 54 having a pair of extrusion rolls 55 and 56 is arranged inside each of the tubes 31 and 32 with an arrangement angle of 180 °. The pair of tube pumps 2 and 3 are coaxially arranged and rotationally driven by a common drive shaft 18. That is, the drive shaft 1
Driven sprockets 7 and 8 are attached to 8, and the driven sprockets 7 and 8 are interlocked with a pair of drive sprockets 5 and 6 provided on the drive motor 4 side via chains 9 and 10, respectively. The drive motor 4
Is operated, the pair of tube pumps 2 and 3 are rotationally driven in synchronization. In this embodiment, the rotational phases of the rotors 54, 54 'of the pair of tube pumps 2, 3 are offset by 90 °. Therefore, the tube pumps 2 and 3 are synchronously rotated by the drive motor 4 while maintaining the mutual 90 ° rotation phase.

On the other hand, of the tubes 31 and 32 of the tube pumps 2 and 3, the tube 31 of the first tube pump 2 has a suction port 31a at one end 11a of the suction hose 11 and a discharge port 31b. It is connected to one end 12a of the discharge hose 12, respectively. Similarly, the second
The tube 32 of the tube pump 3 has a suction port 32a.
Is connected to one end 13a of the suction hose 13 and its discharge port 32b.
Are connected to one end 14a of the discharge hose 14, respectively.

The other ends of the suction hose 11 and the suction hose 13 are connected to chutes 16 and 17 provided at the lower end of the hopper 15, respectively. The hopper 15 is configured so that slurry refractory material obtained by hydromixing powdery refractory material having a predetermined composition mixture is sequentially charged and replenished by a separately installed mixing device (not shown).

The taper pipe 20 joins the refractory materials discharged from the tube pumps 2 and 3 and gradually narrows the refractory materials to reduce the pressure pulsation of the refractory material to be pumped. A pair of Y-shaped branch pipes 21 and 22 are attached to the end portion 20a on the large diameter side, and the end portions 21a and 22a of the branch pipes 21 and 22 are connected to the other ends 12b of the discharge hoses 12 and 14, respectively. , 14b
Connected to.

Further, the other end 20b of the tapered tube 20
Is connected to the refractory material introducing portion 25a of the spray nozzle 25 via the material hose 23. This spray nozzle 2
Reference numeral 5 denotes a slurry refractory material that is pressure-fed from each of the tube pumps 2 and 3 described above, which is sprayed from a nozzle 25c by an ejector action of pressurized air and sprayed on a predetermined surface to be sprayed in a diffused state. Air nozzle 2 at one end
An air supply hose 27 is connected via 6.

Subsequently, the pressure-feeding device Z constructed as described above.
The operation in the case of constructing a refractory wall of a required shape by spraying a slurry refractory material onto a predetermined surface to be sprayed by using the above, the hopper 15 is provided with a slurry refractory material in order from the mixing device. Will be replenished. In this state, when the drive motor 4 is operated to drive the tube pumps 2 and 3 of the pump unit 1 to rotate, the suction ports 31a and 32a from the hopper 15 side through the suction hoses 11 and 13, respectively. The slurry-like refractory material sucked to the side is discharged from the discharge ports 31b and 32b at a predetermined discharge pressure by the rotation of the rotor 54. The refractory material discharged from the discharge ports 31b and 32b of the tube pumps 2 and 3 is pressure-fed to the side of the branch pipes 21 and 22 of the tapered pipe 20 through the discharge hoses 12 and 14, respectively. After being merged in the pipe 20, it is further pressure-fed to the spray nozzle 25 through the material hose 23 and sprayed from the injection port 25c.

In this case, although the discharge pressure of the refractory material discharged from each of the tube pumps 2 and 3 has a large pulsation, these tube pumps 2 and 3 are rotationally driven with a rotation phase of 90 °, and The refractory material discharged from each of the tube pumps 2 and 3 merges in the tapered pipe 20 and is gradually squeezed, so that the discharge pressure of the refractory material pumped from the first tube pump 2 side and the second tube pump 3 The discharge pressure of the refractory material pressure-fed from the side interferes with each other, and the discharge pressure of the refractory material after merging is averaged.

Therefore, by spraying the refractory material pressure-fed with the pressure pulsation reduced in this way from the spray nozzle 25, it is possible to surely obtain a good refractory wall surface in a finished state without spray unevenness.

Further, in this case, by using the tube pumps 2 and 3 which are excellent in durability due to their structure as the pumping device, the durability of the device is improved, for example, when a uniaxial eccentric pump is used as in the conventional case. Compared with this, as a result, it is possible to improve workability and reduce operating cost by prolonging the replacement interval of consumable parts.

That is, according to the pressure feeding device Z of this embodiment,
Both the durability of the device and the improvement of the quality of the fire-resistant wall to be constructed are achieved by a simple configuration.

In the above embodiment, the pump unit 1 is composed of the two tube pumps 2 and 3.
The present invention is not limited to this, and the point is that the pump unit 1 may be configured by a plurality of tube pumps. For example, when the pump unit 1 is configured by three tube pumps, the rotational phase of these pumps is set to 120. If it is set to °, the pressure pulsation can be reduced most effectively.

In this embodiment, the tube pumps 2 and 3 are driven by the drive motor 4, but the present invention is not intended to limit the driving means for these tube pumps 2 and 3, and other means. Any driving means (for example, hydraulic actuator etc.) can be applied.

[0026]

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a pressure feeding device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a basic configuration of a tube pump.

[Explanation of symbols]

1 is a pump unit, 2 is a first tube pump, 3 is a second tube pump, 4 is a drive motor, 5 is a drive sprocket, 6 is a drive sprocket, 7 is a driven sprocket,
8 is a driven sprocket, 9 is a chain, 10 is a chain, 11 is a suction hose, 12 is a discharge hose, 13 is a suction hose, 14 is a discharge hose, 15 is a hopper, 1
6 is a chute, 17 is a chute, 18 is a drive shaft, 20 is a taper pipe, 21 is a branch pipe, 22 is a branch pipe, 23 is a material hose, 25 is a spray nozzle, 26 is an air nozzle,
27 is an air supply hose and 31 and 32 are tubes.

Claims (1)

[Claims] 1. A pumping device for spraying a refractory material for sequentially pumping slurry-like refractory material sprayed onto a surface to be sprayed by a spray nozzle 25, having a proper elasticity and flexibility, and having the above-mentioned inside thereof. Tube 3 supplied with refractory material
1, 32, 52 are curvedly arranged to have a predetermined curvature, and the tubes are sequentially pressed and deformed from one end side to the other end side by a plurality of extrusion rolls 55, 56 provided on a rotor 54 driven to rotate. And a pump unit 1 configured to provide a plurality of tube pumps 50, 2 and 3 for pumping the refractory material and to rotate the plurality of tube pumps at a predetermined rotation phase,
A refractory material spraying work pressure-feeding device, comprising: a joining means for joining refractory materials discharged from a plurality of tube pumps of the pump unit and sending the joined refractory materials to the blowing nozzle.