JPH0124023Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a pipe for transporting materials containing powder and granules, and is particularly applicable to pipes for transporting sprayed materials to a spraying machine for monolithic refractories. The present invention relates to a transport pipe for a powder-containing material suitable for transporting.

[Prior art] When repairing damaged parts of the refractory lining of various types of furnaces such as blast furnaces, hot blast furnaces, ladles, converters, heating furnaces, and incinerators,
A widely used spraying method is to force-feed monolithic refractories to the nozzle tip of a spraying machine, mix them with a liquid such as water, and then spray the refractories hot or cold for repair. Various improvements have been made to eliminate uneven kneading of monolithic refractories and additive liquids and to prevent dust generation.

However, when spraying the inner wall surface of a small container such as a tundish using such a spraying method, a transport pipe bent into an L-shape or a dogleg shape is used.

FIGS. 5 to 7 show an example thereof.

In the example shown in FIG.
4 is attached to spray the inner wall surface of the tundish 16. In the example shown in FIG. 6, a spray nozzle 14 is attached to the tip of a transport pipe 12 having one bend 10 in the middle, and spraying is performed on the inner wall surface of a duct 18. In addition, in the example of Fig. 7, L
A letter-shaped bent portion 10 and two dogleg-shaped bent portions 2
A spray nozzle 14 is placed at the tip of the transport pipe 12 having a
is provided, and spraying is performed on the side circumferential surface of the RH immersion pipe 22.

However, in conventional transport pipes, materials such as monolithic refractories pumped from a material pumping device are forced outward at the L-shaped or dogleg-shaped bent portions due to the action of centrifugal force, etc. This resulted in the problem of material adhering to and accumulating on the inner circumferential surface of the bent portion of the transport pipe. (In addition, when spraying into large containers such as ladles, converters, electric furnaces, etc., there is sufficient distance for kneading between the time the liquid is added after the bend and the time it is discharged. (Adhesion and accumulation hardly pose a problem.) In order to eliminate this adhesion and accumulation of materials, various measures have been taken, such as those shown in FIGS. 3 and 4.

In FIGS. 3 and 4, material is being transported from the material inflow side 24 to the material outflow side 26 at the bent portion of the transport pipe 12. In the example shown in FIG. 3, the material outflow side 26 of the transport pipe 12 is extended upstream to form a T-shaped bent part, and an air jet nozzle 30 is installed in this extended part 28. It is configured to blow air into the transport pipe 12 when the pipe is inserted into the transport pipe 12. That is, when the material flowing from the material inlet side 24 collides directly with the front wall surface 32 of the bending part and adheres to this part, the adhered material 34 is absorbed by the air ejected from the air ejection nozzle 30. Therefore, the material is sent to the material outflow side 26.

In the example shown in FIG. 4, a large number of air outlets 38 are formed in the curved inner wall surface 36 of the bent portion, and an auxiliary air inlet 40 is provided on the outside of the transport pipe 12 so that air is blown out from the air outlets 38. A cover 42 is provided. The material flowing from the material inlet side 24 is prevented from colliding with the inner wall surface 36 and depositing on this part by the air ejected from the jet port 38, and is sent to the material outlet side 26. It is structured as follows.

[Problems to be Solved by the Invention] However, with the above-mentioned conventional measures, it has not been possible to reliably prevent material from adhering and accumulating on the inner surface of the bent portion of the transport pipe.

That is, in the case of FIG. 3, the inner surface 3 of the transport pipe
It is unavoidable that the material 34 adheres to the material 2, and once the material has progressed to a certain extent, the air blown out from the nozzle 30 blows the adhered and deposited material 34 toward the material outflow side 26. As a result, a so-called pulsation phenomenon occurs in which the amount of material supplied from the transport pipe 12 to the spray nozzle pulsates, as well as poor kneading, resulting in a dripping phenomenon in which the material drips from the tip of the spray nozzle.

Further, in the example shown in FIG. 4, the material adheres and accumulates on the inner wall surface 36 of the transport pipe, and the air outlet 38 is gradually blocked, reducing the total area of the openings. Then, the air blowing pressure increases, and the adhered and deposited material 34 is peeled off from the inner wall surface 36 at once and flows out to the material outflow side 26. The adhered and deposited material 34 is attached to the inner wall surface 36
After the material is peeled off from the surface, the air blowing pressure from the air blowing port 38 decreases, so that material starts to adhere and accumulate on the inner wall surface 36 again. By repeating such a pattern at regular intervals, sagging and pulsation phenomena occur, similar to the example shown in FIG. 3, and smooth transport of the sprayed material is not achieved.

In the wheelless example shown in FIGS. 3 and 4, if an extremely large amount of air is blown out at high pressure from the nozzle 30 or the spout 38, material adhesion itself can be prevented; Disturbances occur in the flow of the sprayed material within the transport pipe, making it impossible to transport the material smoothly.

The present invention solves the above-mentioned problems of the prior art, prevents material from adhering and accumulating on the inner surface of the bent part of the transport pipe, and also prevents the so-called sagging phenomenon and pulsation phenomenon when applied to the sprayed material transport pipe. The purpose of the present invention is to provide a transport pipe for powder-containing materials that can be eliminated.

[Means for Solving the Problems] The present invention has a structure in which one end is fixed to the pipe and the other end is a free end inside the bent part of the transport pipe for transporting powder-containing materials such as sprayed materials. A plate-shaped flexible member is provided so as to extend in the material transport direction and one of the plate surfaces faces the material inflow side, and air is introduced into the other side of the plate surface to make it flexible. It is equipped with an air inlet for swinging the sex member.

[Operation] When transporting a material using a transport pipe having a bent portion, air is blown into the transport pipe from the air blowing port to shake the flexible member. Then, at least a portion of the material flowing inside the transport pipe hits this flexible member, and the amount of material that hits the inner wall surface of the bent part of the transport pipe is significantly reduced, resulting in a state in which the material is sufficiently dispersed. At this point, the flow changes according to the bend in the transport pipe and flows downstream. Therefore, the material is transported without being attached or deposited on the inner wall surface of the bent portion of the transport pipe, and a spraying machine using this transport pipe can perform stable spraying without uneven distribution.

[Example] The embodiments shown in the drawings will be described below.

1 and 2 are cross-sectional views showing the structure of a bent portion of a transport pipe according to an embodiment of the present invention.

A plate-shaped flexible member 60, whose one end is fixed and the other end is a free end, extends in the material transport direction inside the bent portion of the L-shaped transport pipe 12. And one of the plate surfaces is the material inflow side 24
It is set up to face. A fixed platen 62 is attached to the extension portion 28 by a cap 64, and one end of the flexible member 60 is fixed to the fixed platen 62. The fixed platen 62 has a small flange portion 66
This small flange 66 is the extension part 28.
The cap 64 is clamped and fixed by a cap 64 screwed onto the extension 28.

Further, an auxiliary air inlet 68 is provided in the transport pipe 12 in order to inject auxiliary air from the back side of the flexible member 60 to shake the plate-shaped flexible member 60. Note that in this embodiment, the flexible member 44,
The material 60 is made of ordinary rubber, but other materials having flexibility and durability, such as a bundle of fibers, may be used.

In the embodiment of FIG. 2, when transporting the material, air is blown through the auxiliary air inlet 68;
The flexible member 60 is shaken, and then,
The material flowing in from the material inflow side 24 hits this oscillating flexible member 60 and flows out to the material outflow side 26 without adhering thereto. Therefore, the material is uniformly dispersed and the material is transported stably.

Note that the flexible member 60 is attached to the fixed platen 62,
By making it detachable from the transport pipe 12, worn flexible members can be replaced very easily without disassembling the transport pipe itself.

FIGS. 5 to 7 are diagrams showing a state in which spraying is being performed using a spraying machine that employs the transport pipe of the present invention. In FIG. 5, the transport pipe 12, which is rotated about its axis by the rotational drive device 72 attached to the arm 70, has two transport pipe bends 10 as described above, and the tip thereof A spray nozzle 14 is provided. This bent part 10
An auxiliary air hose 76 is connected to each bend 10 for supplying air to the auxiliary air hose 76 . Note that the upstream side of the transport pipe 12 is connected to a material hose 80 via a swivel joint 78. In addition, the transport pipe 12
A liquid adder 82 is provided in the middle, and a liquid addition hose 84 is connected to this liquid adder 82.

In the apparatus shown in FIG. 5, the material to be sprayed is fed into the transport pipe 12 from the material hose 80, and
The liquid is added into the transport pipe 12 from the additive liquid hose 84 and the liquid adder 82. The material to which the liquid has been added passes through the bent portion 10 while being kneaded on the tip side of the liquid adder 82, and is sprayed from the spray nozzle 14 toward the inner surface of the tundish 16, thereby performing spraying. Then, the rotary drive device 72 rotates at a predetermined speed.
is driven to rotate the transport pipe 12, thereby performing spraying construction.

In the example of FIG. 6, the rotary drive device 72 is mounted on a rail 86, and the travel drive motor 8
8 so that it can move within the duct 18. Also in the example of FIG. 6, from the material hose 80 to the swivel joint 78 and the rotary joint 9.
The spraying material supplied into the transport pipe 12 through the pipe 12 is mixed with the liquid supplied from the liquid addition hose 84 through the liquid adder 82, and is then passed through the bend 10 from the spray nozzle 14 into the duct. It is injected towards the inner surface of 18. Air is supplied to this bent portion 10 from an auxiliary air hose 76, and material is prevented from adhering to its inner surface. Then, by driving the rotary drive device 72 to rotate the transport pipe 12 and driving the traveling drive motor 88 to move the rotary drive device 72 at a predetermined speed, the inner surface of the duct 18 is continuously sprayed. will be held.

In the example shown in FIG. 7, the rotary drive device 72 is installed on a lifting table 92, thereby making it movable in the vertical direction. In the example shown in FIG. 7, the spraying material supplied into the transport pipe 12 is supplied with liquid from a liquid addition hose 84 in a liquid adder 82, and is kneaded at the tip side of the liquid addition hose 84. 20 and the T-shaped bent part 10, and is sprayed from the spray nozzle 14 toward the side peripheral surface of the RH dip tube 22. Then, by raising and lowering the elevating table 92 at a predetermined speed and rotating the rotary drive device 72 at a predetermined speed, the side peripheral surface of the RH immersion tube 22 can be sprayed continuously.

When spraying was carried out using a transport pipe with the bent part structure shown in FIGS. 1 and 2, a sufficiently kneaded and uniformly dispersed material was injected from the spray nozzle 14. Ta. In addition, there is no dripping or pulsation in the material sprayed from the nozzle, and bonding efficiency has been improved from about 65% with conventional construction methods to 80-85%, and material consumption has been reduced by 20-30%. In addition, the applied surface became denser, a dense sprayed layer with no segregation could be obtained, and the product did not fall off after installation, resulting in improved durability. Note that the plate-like flexible member 60 may have a slit.

In addition, in the above embodiment, the case where it is applied to the spraying of monolithic refractories was explained, but the present invention can be applied to various powders, granules, etc., such as the spraying of concrete for civil engineering.
It can be widely used for transportation pipes for powder-containing materials containing powder and granular materials such as mixtures of powder and powder.

[Effects] As described above, the transport pipe of the present invention is provided with a flexible member at its bent portion, and the following excellent effects are achieved.

(1) Materials can be transported stably without material adhering or accumulating on the inner wall surface of the bent portion of the transport pipe.

(2) Since the flexible member is shaken by the auxiliary air, no material adheres or accumulates on the flexible member.

(3) When the transport pipe of this invention is applied to the spraying method,
Because the material is uniformly distributed by the flexible member, there is no dripping or pulsation of the material being sprayed from the sprayer. Furthermore, the sprayed construction body will also be dense. Furthermore, since the material supply is uniform and stable, working time is shortened and material consumption is also reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the transport pipe of the embodiment, FIG. 2 is a sectional view taken along the - line in FIG. FIG. 5, FIG. 6, and FIG. 7 are diagrams each illustrating the spraying method using the transport pipe of the present invention. 10, 20...Bending portion, 12...Transport pipe, 14
...Spray nozzle, 16...Tandate dish, 1
8... Duct, 22... RH dip tube, 28... Extension, 30... Air jet nozzle, 34... Adhesive deposition material, 38... Air jet nozzle, 60... Flexible member, 68... Auxiliary air inlet, 72...Rotary drive device, 76...Auxiliary air hose, 80...Material hose, 82...Liquid adder, 84...Liquid addition hose, 88...Travel drive motor, 92... Lifting table.

Claims (1)

[Claim for Utility Model Registration] In a bent part of a pipe for transporting a powder-containing material, a plate-shaped flexible member whose one end is fixed to the pipe and the other end is a free end is used to transport the material. The flexible member is provided with an air inlet on the other side of the plate surface for introducing air and swinging the flexible member. A transport pipe for a powder-containing material, characterized in that it is installed in the pipe.