JP6746341B2 - Structure for connecting solid material transport pipes - Google Patents

Description

The present invention is directed to uneven wear of raw material/materials (for example, sinter, coke, coal, cement, asphalt, crushed stones) in steel mills, sintering furnaces, etc. The present invention relates to a structure that suppresses

In recent years, it has been carried out to transport raw materials and solid materials such as municipal solid waste in a steel mill or the like by a fluid such as air. However, the friction between the solid material and the inner surface of the transportation path, or the solid material is transported to the transportation path ( It is inevitable that the inner surface of the transportation pipe will be worn due to the collision. Therefore, a wear resistant material is used in the portion of the transport pipe where such wear is likely to occur.
In addition, the transportation path (pipe) is rarely linear and has a considerable 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 of the curved material, and the wear of the portion becomes severe (uneven wear). For example, as shown in FIG. 8, a hole s is formed in the vicinity of the downstream side of the flange F forming the connecting portion due to wear. If the hole s is formed, not only the fluid but also the solid matter will be blown out.

As a means for making the holes less likely to occur or for repairing, it has been conventionally considered that the uneven wear portion where the holes are likely to occur is made of a high 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 claims 1 to 5 and FIG. 1 of Patent Document 1).

JP, 9-96396, A

Although the above-mentioned liner liner member is effective as such, it is necessary to carry out work such as lacking a part of the pipeline or assembling the liner member into the missing part. In terms of cost, it is a problem.

Under the above circumstances, an object of the present invention is to reduce the cost and suppress uneven wear.

In order to achieve the above-mentioned subject, the present invention focuses on that the location where uneven wear occurs is in the vicinity of the connecting portion (joint) in the curved portion of the transportation pipeline, and the portion that is liable to wear is forward in the transport direction ( The front side) was covered with a tongue made of a wear-resistant material so that the tongue did not allow solid matter to reach the easily worn parts.
By doing so, the solid matter does not reach the portion that is likely to be unevenly worn, so that portion will not be unevenly worn.

As a specific configuration of the present invention, in a connecting portion structure in a curved portion of a solid material transportation pipeline in which a plurality of transportation tubes are coupled via a flange at an end thereof, uneven transportation of the transportation pipe in the curved portion is likely to occur. It is possible to adopt a configuration in which a tongue piece (obstacle piece) made of a wear-resistant material that covers the portion on the front side in the transport direction is provided on the inner end surface of the flange continuous with the inner surface of the transport tube so as to project inward from the end surface.

As a means for using the tongue piece as a wear resistant material, it is possible to use cemented carbide or the like, but a hardfacing welded layer is formed on the front side surface of the inexpensive general-purpose steel material in the above-mentioned transportation direction to provide a wear resistant material. Is cheap.
Various configurations are conceivable for projecting the tongue piece. For example, a ring having the tongue piece is interposed between both flanges of the connecting portion facing each other, or the tongue piece is connected to the connecting portion. It can be integrally provided on one of the opposing flanges. In the former case, the ring may also be made of wear resistant material. Further, a hardfacing welding layer may be formed on the entire inner surface of the ring and the entire inner surface of the flange.
Furthermore, if the tongue piece is configured to project obliquely inward in the transport direction, the frictional force on the tongue piece is also reduced and wear of the tongue piece is suppressed. Further, it is also possible to form a hardfacing welding layer on the entire inner surface of the transport pipe which is continuous with both the facing flanges of the connecting portion.

As described above, according to the present invention, the solid matter is prevented from reaching the portion that is likely to be unevenly worn by the tongue piece, so that the uneven wear can be suppressed with a simple structure.

A partially cutaway 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 forming the connecting portion of the embodiment is shown, (a) is a plan view, (b) is a cut front view, and (c) is an enlarged view of a main part. Another example of the ring is shown, (a) is a plan view, (b) is a cutaway front view, and (c) is an enlarged view of a main part. The other example of the ring is shown, (a) is a top view, (b) is a cutaway front view. Plan views showing other examples of the ring. A partially cutaway schematic front view of another embodiment of the connection portion structure of the solid material transport pipe. The flange part which concerns on the same embodiment is shown, (a) is a top view, (b) is a cutting|disconnection front view. Partial perspective view of uneven wear portion of transport pipe

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

The ring 10 uses, for example, a general-purpose steel material such as SS400, and the tongue piece 11 has the steel material 11a attached to the inner peripheral edge of the ring 10 by welding a. The gap between and is covered or filled with the hardfacing welding layer 11b (see FIG. 2(c)).
The length L, the protrusion length t, and the inclination angle θ of the tongue piece 11 at the inner peripheral edge of the ring 10 are appropriately determined so that the wear hole s shown in FIG. To decide.

This ring 10 is attached between the flanges F and F by bolt and nut tightening, and the intervening connecting portion is in the mode of FIG. 1, and air c containing solid matter flows in this transport pipeline from the direction of the arrow. Then, the air c collides with the tongue piece 11 to prevent the movement of the solid matter in the air c, and at the curved portion, the tongue piece 11 changes the flow path to the center of the pipe line to disperse the solid matter. Prevents reaching parts that are easily worn. Therefore, uneven wear is unlikely to occur.
If the tongue piece 11 is worn out, the ring 10 is replaced. In this way, if uneven wear of the pipeline is suppressed only by replacing the ring 10, the life of the entire pipeline can be extended.

As shown in FIGS. 3(a) to 3(c), the ring 10 can also have a hardfacing welded layer 11b formed on the entire inner peripheral surface thereof. As shown in FIG. 4, the tongue piece 11 is integrally formed with the ring main body by cutting out from a general-purpose steel material, and the ring 10 is formed by forming the hardfacing welding layer 11b on the surface of the tongue piece 11. You can also At this time, similarly, the hardfacing weld layer 11b (the chain line portion in the figure) can be formed on the entire inner peripheral surface of the ring.
As shown in FIGS. 5A and 5B, the hardfacing welding layer 11b can be formed on the upper surface (front side surface in the transport direction) of the ring 10 if necessary. At this time, the hardfacing welding layer 11b may have only the portion exposed on the inner peripheral surface of the transport pipe P on the upper surface thereof, or only that portion and a portion slightly outside the portion.

Further, as shown in FIGS. 6 and 7, the tongue piece 11 may be integrally provided on the flange F without providing the ring 10. At this time, the hardfacing welding layer 11b 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 hardfacing welding layer 11b can be formed on the entire circumference of the inner surface of the transport pipe P that is continuous with the opposing flanges F of the connecting portion.
In addition, in the embodiment shown in FIG. 4, FIG. 5( b) and FIG. 7, the tongue piece 11 may be bent downward as shown in FIG. 6. Further, the ring 10 and the flange F can also be made of a wear resistant material such as a high Cr alloy instead of a general-purpose steel material.
As described above, it should be considered that the embodiments disclosed this time are exemplifications in all points and not restrictive. The scope of the present invention is shown by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

P pipe (transport pipe)
s Uneven wear hole c Air containing solid matter (fluid)
10 Ring 11 Tongue piece 11a Steel material 11b of the tongue piece Hardened weld overlay

Claims (7)

A connecting portion structure in a curved portion of a solid material transport pipeline in which a plurality of transport pipes (P) are coupled via flanges (F, F) at their ends, the outside of the transport pipe (P) in the curved portion. A tongue piece (11) made of a wear-resistant material that covers a portion of the inner surface that is likely to be unevenly worn on the front side in the transport direction is provided on the inner end surface of the flange (F) at the end that is continuous with the inner surface of the transport pipe (P) at the curved portion. The transport pipe is provided so as to project inward from the end face thereof , and the tongue piece (11) prevents the solid matter from reaching the outer inner surface of the transport pipe (P) of the curved portion. Connection structure of transport pipes in roads. The connection of transport pipes in a transport line according to claim 1, characterized in that a ring (10) having the tongue (11) is interposed between both flanges (F, F) facing each other of the connection portion. Part structure. The connecting part structure of a transport pipe in a transport pipeline according to claim 1, wherein the tongue piece (11) is integrally provided on one of the opposite flanges (F) of the connecting part. The tongue piece (11) is a wear-resistant material by forming a hardened buildup weld layer (11b) on the front side surface in the transport direction, and is a wear-resistant material. Structure of connecting parts of transportation pipes in transportation pipelines. A hardened buildup welded layer (11b) is formed on the entire inner surface of the ring (10) having the tongue piece (11), the transport pipe of the transport pipeline according to claim 1, 2 or 4. Connection structure. The transport pipe connecting portion structure in a transport pipeline according to any one of claims 1 to 5, wherein the tongue piece (11) projects obliquely inward in the transport direction. 7. A hardfacing welding layer is formed on the entire circumference of the inner surface of a transport pipe (P) that is continuous with both flanges (F, F) facing each other of the connecting portion. A structure of a connecting portion of a transportation pipe in the transportation pipeline described.

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