JP2017180572A - Connection part structure of solid matter transport pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict partial wear under a less-expensive manner.SOLUTION: This invention relates to a connection part structure at a curved portion of a transport pipe passage for solid material in which several transport pipes P are through flanges F, F at their ends. A tongue piece 11 made of anti-wear material covering a part of the transport pipes P of the curved portion that is easily worn out at a front side in a transporting direction is arranged at an inner side end surface of the flange F continuous to an inner surface of the transport pipe P to be protruded inward from its end surface. With this arrangement as above, since solid material does not reach the part which can be easily worn out, that part will not be worn out in an eccentric manner. It is possible that the tongue piece 11 is arranged at a ring 10 present between both opposing flanges F, F at the connection part or can be arranged directly at the flange F. A hardening padding may also be applied to an inner peripheral surface of the ring 10 or an inner peripheral surface of the flange F. When the tongue piece 11 is arranged at the ring, if the to connected tongue piece is worn out or damaged, entire ring 10 is replaced. In this way, when the eccentric wear at the pipe passage is restricted only through a replacement of the ring 10, it is possible to extend a life of the entire pipe passage.SELECTED DRAWING: Figure 1

Description

  The present invention relates to uneven wear of connecting portions of transport pipes in transport pipes of raw materials / materials (for example, sintered ore, coke, coal, cement, asphalt, crushed stone, etc.) and municipal waste in steelworks, sintering furnaces, etc. It is related with the structure which suppresses.

In recent years, raw materials / materials in steelworks etc. and solids such as municipal waste have been transported by a fluid such as air, but the friction between the solids and the inner surface of the transportation path, or the solid matter is transported ( Transport pipe) It is inevitable that the inner surface of the transport pipe will wear due to collision. For this reason, a wear-resistant material is used in a portion where the wear of the transport pipe is likely to occur.
In addition, the transportation path (pipe) is often not linear, and has a curved portion (see FIGS. 1 and 6). When the solid material passes through the curved portion, a large amount of the solid material passes through the outer inner surface, and wear of the portion becomes intense (partial wear). For example, as shown in FIG. 8, a hole s is generated by wear in the vicinity of the downstream side of the flange F forming the connecting portion. If the hole s is generated, not only fluid but also solid matter is blown out.

  As a means for making the hole difficult to make or repairing, there has been a conventional idea of making the uneven wear portion where the hole is likely to be made a highly wear resistant material, and one of them is uneven wear or uneven wear. There is one in which a member having a highly wear-resistant lining liner is detachably provided at a place where it is easy to do (see Patent Document 1, Claims 1 to 5, FIG. 1 and the like).

JP-A-9-96396

  Although the above liner liner member is effective as it is, it requires work such as lacking a part of the pipeline or installing the liner member in the lacked part, such as work time and labor costs. This is a problem in terms of cost.

  This invention makes it a subject to make it cheap and suppress uneven wear under the above actual condition.

In order to achieve the above object, the present invention pays attention to the fact that the portion where uneven wear occurs is in the vicinity of the connecting portion (seam) in the curved portion of the transport pipeline. It is covered with a tongue piece made of a wear-resistant material on the front side so that solid matter does not reach the portion that is easily worn by the tongue piece.
In this way, since solids do not reach the portion that is subject to uneven wear, the portion will not be unevenly worn.

  As a specific configuration of the present invention, in the connecting portion structure in the curved portion of the solid material transport pipe in which a plurality of transport pipes are connected through the flanges at the ends thereof, the transport pipe in the curved portion is likely to be unevenly worn. It is possible to employ a configuration in which a tongue piece (baffle piece) made of a wear-resistant material covering the portion on the front side in the transport direction is provided so as to protrude inward from the end face on the inner end face of the flange continuous with the inner face of the transport pipe.

It is conceivable to use cemented carbide or the like as a means for making the tongue piece a wear-resistant material. However, a hardened welded layer is formed on the front side in the transport direction of an inexpensive general-purpose steel material to make the wear-resistant material. Is cheap.
In addition, various configurations for projecting the tongue piece are conceivable. For example, a ring having the tongue piece is interposed between the opposing flanges of the connecting portion, or the tongue piece is attached to the connecting portion. It can be provided integrally with one of the opposing flanges. In the former case, the ring can also be formed of a wear resistant material. Further, a hardened weld layer can be formed on the entire inner surface of the ring or the entire inner surface of the flange.
Further, if the tongue piece protrudes obliquely inward in the transport direction, the frictional force on the tongue piece is also reduced and the wear of the tongue piece is also suppressed. Moreover, a hardening build-up weld layer can also be formed on the entire inner circumference of the transport pipe continuous with the opposing flanges of the connecting portion.

  According to the present invention, since solids are prevented from reaching the portion where uneven wear is easily caused by the tongue piece as described above, uneven wear can be suppressed with a simple structure.

Partially cutout schematic front view of an embodiment of a connecting portion structure of a solid material transport pipe according to the present invention An example of the ring interposed between the flanges which comprise the connection part of the embodiment is shown, (a) is a plan view, (b) is a cut front view, and (c) is a main part enlarged view. The other example of the ring is shown, (a) is a plan view, (b) is a cut front view, (c) is an enlarged view of the main part. The other example of the ring is shown, (a) is a plan view, (b) is a cut front view. Each plan view showing another example of the ring Partially cutout schematic front view of another embodiment of the connecting portion structure of the solid material transport pipe The flange part which concerns on the embodiment is shown, (a) is a top view, (b) is a cut front view Partial perspective view of uneven wear part in transport pipe

  1 and 2 show an embodiment of a connecting portion structure of a solid material transport pipe according to the present invention, and this embodiment is provided between flanges F and F of a connecting portion that forms a curved portion where uneven wear tends to occur. The ring 10 having the tongue piece 11 covering the portion where the partial wear is likely to occur is interposed. The pipe P of the curved portion is obtained by connecting a required number of trapezoidal pipe members by welding in a front view.

The ring 10 uses, for example, a general-purpose steel material such as SS400, and the tongue piece 11 is attached to the inner peripheral edge of the ring 10 by welding a. The entire upper surface of the steel material 11a and the inner peripheral edge of the ring 10 are attached. Is covered or filled with the hardfacing welded layer 11b (see FIG. 2C).
The length L, the protruding length t, and the inclination angle θ at the inner peripheral edge of the ring 10 of the tongue piece 11 are determined as appropriate so that the portion where the wear hole s shown in FIG. To decide.

The ring 10 is interposed between the flanges F and F, and is attached by tightening bolts and nuts. The interposed connecting portion is in the form shown in FIG. 1, and air c containing solid matter flows from the direction of the arrow to the transportation pipeline. Then, in the curved portion, the tongue piece 11 changes the flow path to the center of the pipe line, thereby preventing the solid matter from reaching a portion that tends to be unevenly worn. For this reason, uneven wear hardly occurs.
If the tongue piece 11 is worn out, the ring 10 is replaced. Thus, if the uneven wear of the pipe line is suppressed only by exchanging the ring 10, the life of the whole pipe line can be extended.

As shown in FIGS. 3A to 3C, the ring 10 can also form a hardened welded layer 11 b over the entire inner peripheral surface. Moreover, as shown in FIG. 4, it is set as the ring 10 which formed the tongue piece 11 integrally with the ring main body by cutting out from a general-purpose steel material, etc., and formed the hardened welding layer 11b on the surface of the tongue piece 11. You can also. At this time, similarly, a hardened welded layer 11b (a chain line portion in the figure) can be formed over the entire inner peripheral surface of the ring.
As shown in FIG. 5A and FIG. 5B, a cured build-up weld layer 11b can be formed on the upper surface (front side surface in the transport direction) of the ring 10 as necessary. At this time, the cured build-up weld layer 11b may be only the portion exposed on the inner peripheral surface of the transport pipe P on the upper surface, or only the portion and the portion slightly outside from the portion.

Further, as shown in FIGS. 6 and 7, the tongue piece 11 may be provided integrally with the flange F without providing the ring 10. At this time, the hardened welded layer 11 b can be formed not only on the upper surface of the tongue piece 11 (front side surface in the transport direction) but also on the inner peripheral surface of the flange F (the chain line portion in the figure) and further on the upper surface of the flange F.
Furthermore, the hardening build-up welded layer 11b can also be formed on the entire inner circumference of the transport pipe P that is continuous with both flanges F facing the connecting portion.
In the embodiment shown in FIG. 4, FIG. 5B and FIG. 7, the tongue piece 11 may be bent downward as shown in FIG. Also, the ring 10 and the flange F can be made of wear-resistant materials such as high Cr alloys, not general steel materials.
Thus, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

P pipeline (transport pipe)
s Uneven wear hole c Solid-containing air (fluid)
10 Ring 11 Tongue piece 11a Steel material 11b of tongue piece The same build-up weld layer

Claims (7)

  A connecting portion structure in a curved portion of a solid material transport pipe in which a plurality of transport pipes (P) are connected via flanges (F, F) at the ends thereof, wherein the transport pipe (P) in the curved portion is offset. A tongue piece (11) made of an abrasion-resistant material that covers a portion that is easily worn on the front side in the transport direction is provided so as to protrude from the end surface to the inner end surface of the flange (F) continuous with the inner surface of the transport pipe (P). A transport pipe connecting portion structure in a transport pipeline.   The connection of the transport pipe in the transport pipeline according to claim 1, wherein the ring (10) having the tongue piece (11) is interposed between both opposing flanges (F, F) of the connection portion. Part structure.   The said tongue piece (11) is integrally provided in one of the both flanges (F) which the said connection part opposes, The connection part structure of the transport pipe in the transport pipeline of Claim 1 characterized by the above-mentioned.   4. The tongue piece (11) according to any one of claims 1 to 3, wherein the tongue piece (11) is a wear-resistant material by forming a hardened welded layer (11b) on the front side surface in the transport direction. Transport pipe connection structure in the transport pipeline.   5. A transport pipe in a transport pipeline according to claim 1, wherein a hardened welded layer (11b) is formed on the entire inner circumference of the ring (10) having the tongue piece (11). Connecting part structure.   6. The transport pipe connecting portion structure in a transport pipeline according to claim 1, wherein the tongue piece (11) protrudes obliquely inward in the transport direction.   The hardened build-up weld layer is formed on the entire inner circumference of the transport pipe (P) that is continuous with the opposing flanges (F, F) of the connecting portion. The connection part structure of the transport pipe in the described transport pipeline.

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