JPH0431497B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Fields This invention is used, for example, for pneumatic transport pipes for grains such as wheat, coal slurry transport pipes for thermal power plants and steel plants, and dust collection ducts for factories where dust is generated. The present invention relates to a method of manufacturing a wear-resistant pipe-shaped article.

BACKGROUND TECHNOLOGY AND PROBLEMS The above-mentioned pipes are subject to severe abrasion, and to prevent this, the inner surface of the pipe is lined with a lining. Rubber, cement, wear-resistant cast iron, etc. are used as materials for the lining, but none of them are optimal in terms of durability, weight, workability, price, etc.
Therefore, recently, ceramics have been attracting attention as a material that satisfies each of the above points.

The following two methods are known for lining the inner surface of a pipe with ceramic. The first method is to insert a plurality of ring-shaped ceramic segments 31 into a pipe 32, as shown in FIG.
This method involves filling cement 33 or the like between the pipe 32 and the pipe 32 to fix both 31 and 32, but this method has the following problems. First, segment 3
1 by molding with a mold or the like, it takes time to manufacture the segment 31, and the manufacturing cost increases. Second, since segment 31 is one fairly large chunk, segment 31 is prone to cracking, and increasing its thickness to avoid this makes segment 31 bulky and expensive. The second method is as shown in FIG.
4 is directly attached to the inner surface of the pipe 36 using an adhesive 35. According to this second method, because the tiles 34 can be manufactured at low cost through mass production and because the tiles 34 are small pieces,
Although the drawbacks of the first method can be overcome, there are the following problems. First, the workability is poor, as tiles 34 cannot be applied to areas on the inner surface of pipe 36 that are out of reach. Second, since the contact area between the tile 34 and the pipe 36 is small, the adhesion of the tile 34 is weak. Third, if the pipe 36 corrodes, the tile 34 will easily peel off.

An object of the present invention is to provide a method for manufacturing a wear-resistant pipe-shaped article that solves all of the above-mentioned problems.

Means for Solving the Problems The method of manufacturing a wear-resistant pipe-shaped article according to the present invention includes using a mold whose diameter can be expanded or contracted freely and whose outer surface matches the inner surface of the pipe-shaped article to be manufactured when the diameter is expanded. A large number of wear-resistant tiles are removably pasted to cover the outer surface of the mold when the diameter is expanded, and synthetic resin is filled in the joints of each tile and synthetic resin is applied to the outer surface of each tile. By curing the pipe-shaped article by molding the inner tile layer and the outer synthetic resin layer, and by reducing the diameter of the mold and releasing the pipe-shaped article from the mold,
It consists of obtaining a pipe-shaped article.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 10.

For manufacturing the wear-resistant pipe-shaped article 11,
A mold 12 shown in FIG. 1 is used. The mold 12 includes a pair of divided pieces 13 and 14 having semicircular cross sections facing each other.
and a turnbuckle 15 connecting both the divided pieces 13 and 14. Both divided pieces 13 and 14 are
It is made according to the shape of the pipe-shaped article 11 to be manufactured, and is made by dividing a cylindrical pipe having an outer circumferential surface that matches the inner circumferential surface of the pipe-shaped article 11 into two in the radial direction, and separating the two in the radial direction. This was obtained by slightly removing the edges along the entire length. The turnbuckle 15 has a right-handed threaded member 16 fixed to one of the divided pieces 13 in an inwardly protruding manner.
, a left-handed threaded member 17 fixed to the other divided piece 14 so as to face this, and double-threaded members 16,1
The split pieces 13 and 14 are made of internally threaded members 18 which are screwed into the respective parts 7, and by rotating the internally threaded members 18 in forward and reverse directions, the two divided pieces 13 and 14 approach and separate from each other.

By adjusting the turnbuckle 15, the outer surface of the mold 12 is made to generally match the inner peripheral surface of the pipe-shaped article 11 to be manufactured. In this way, as shown in FIG.
At this time, the tile 19 is pasted on one side of the double-sided adhesive sheet 20 in advance, and the tile 19 is pasted through the adhesive sheet 20.
If it is pasted on the outer surface of the mold 12, the workability is good. The tile 19 is made of ceramic whose main component is a metal oxide such as aluminum oxide, and has extremely high wear resistance. As an example, the shape of the tile 19 is a square of 2 cm x 2 cm, and the thickness is about 4 mm. Further, both sides of the tile 19 are smooth. Next, apply synthetic resin 2 to the joints and outer surface of each tile 19.
Apply or spray 1. As the synthetic resin 21, an epoxy resin suitable for bonding ceramics is most suitable, but it is not necessarily limited to this. Furthermore, if strength is required, glass fibers (not shown) may be embedded in the synthetic resin 21. After waiting for the synthetic resin 21 to harden, the tile 19 and the synthetic resin 21 are integrated, and the integrated tile 19 and synthetic resin 21 are molded into the mold 1.
The mold may be released from step 2. To harden the synthetic resin 21, it may be left as is in natural air, but to accelerate hardening, a furnace or hot air may be used. The mold release is performed by adjusting the turnbuckle 15 to reduce the diameter of the mold 12.

Both sides of the tile 19 shown in FIG. 2 were smooth, but in order to strengthen the adhesive force between the tile 19 and the synthetic resin 21, the tiles 19 shown in FIGS. You can use the one shown below. One side of the tile 22 shown in FIGS. 3 and 4 is provided with unevenness 23 having a corrugated cross section. A large number of square pyramid-shaped projections 25 are provided on one side of the tile 24 shown in FIGS. 5 and 6. A chamfer 27 is provided on the side surface of the tile 26 shown in FIGS. 7 and 8.

Next, a method of using the pipe-shaped article 11 obtained as described above will be explained with reference to FIGS. 9 and 10. One of them is a flange 28 at the end of the pipe-like article 11, as shown in FIG.
etc., and use it as is.Another method is to insert a pipe-shaped article 11 into an iron pipe 29 to reinforce its strength, as shown in Fig. 10, and then use this. . Pipe-shaped article 1
When inserting 1, liquid synthetic resin 3 is applied to its outer surface.
Apply 0. The iron pipe 29 may be an existing one, and in this case, the inner surface of the existing iron pipe 29 can be lined with a wear-resistant material by a simple operation of inserting the pipe-shaped article 11.

Effects of the Invention According to the present invention, a pipe-shaped article is obtained by coating the outer surface of the mold with tiles and synthetic resin, so workability is good, and since the tiles and synthetic resin are integrated, Tiles become difficult to peel off. Furthermore, if the pipe-shaped article obtained as described above is used as a lining material for iron pipes,
Not only the wear resistance of iron pipes but also the corrosion resistance of iron pipes is improved due to the moisture-proofing properties of the synthetic resin.

[Brief explanation of drawings]

1 to 10 show examples of the present invention, FIG. 1 is a perspective view of a mold used in carrying out the invention, and FIG. 2 is a section of a pipe-shaped article and mold obtained by the invention. Cross-sectional views, Figures 3 to 8
The figures all show modified examples of the tiles; Figures 3, 5, and 7 are all plan views, Figures 4, 6, and 8 are side views, and Figure 9 is a side view. and FIG. 10 both show how to use the pipe-shaped article, FIG. 9 is a perspective view, and FIG. 10 is a partial cross-sectional view. 11 and 12 both show conventional examples, with FIG. 11 being an exploded perspective view and FIG. 12 being a partial cross-sectional view. 11... Pipe-shaped article, 12... Mold, 13,1
4... Divided piece, 19, 22, 24, 26... Tile, 21... Synthetic resin.

Claims (1)

[Claims] 1. Use a mold whose diameter can be expanded or contracted freely and whose outer surface matches the inner surface of the pipe-shaped article being manufactured, and a large number of wear-resistant tiles should be used to cover the outer surface of the mold when the diameter is expanded. A pipe-shaped article consisting of an inner tile layer and an outer synthetic resin layer is formed by attaching the tiles in a removable manner, filling the joints of each tile with synthetic resin, and applying and curing the synthetic resin to the outer surface of each tile. A method for producing a wear-resistant pipe-shaped article, which comprises: reducing the diameter of a mold and releasing the pipe-shaped article from the mold to obtain a pipe-shaped article.