JPH0535059B2 - - 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 to use ceramic tiles 34 as shown in FIG.
is directly attached to the inner surface of the pipe 36 using an adhesive 35. According to this second method,
Although the drawbacks of the first method can be overcome because the tiles 34 can be mass-produced at low cost and the tiles are small pieces, the following problems arise. 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 is weak. Thirdly, if the pipe 36 is corroded, the tile 3
4 peels off easily.

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 covers the outer surface of a mandrel by pasting a large number of wear-resistant tiles on it, and coats the outer surface of the tile with a synthetic resin. The outer surface is covered by winding the impregnated filamentous glass fiber, and the synthetic resin is cured to form a pipe-shaped article consisting of an inner tile layer and an outer glass fiber-reinforced synthetic resin layer, and the pipe-shaped article is released from a mandrel. It is something to do.

Embodiments Embodiments of the present invention will now be described with reference to FIGS. 1 to 6.

First, the tile 11 used in the present invention will be explained. The tile 11 is made of ceramic whose main component is a metal oxide such as aluminum oxide, and has extremely excellent wear resistance.
The shape of the tile 11 is, for example, a square of 2 cm x 2 cm and a thickness of about 4 mm.

Now, in the method according to the present invention, first, as shown in FIG. 1, the above-described tiles 11 are pasted on one side of an adhesive sheet 12 in a row and column. At this time, a tile-less portion 13 where no tile 11 is attached is left at one edge of the adhesive sheet 12. A plurality of adhesive sheets 12 having tiles 11 pasted thereon are prepared.

Next, the tiles 11 are attached to the mandrel 14, as shown in FIG. 2, by wrapping the adhesive sheet 12 on which the tiles 11 are attached around the mandrel 14. At this time, the non-tile portion 1 of the adhesive sheet 12 to be wrapped next is wrapped around the non-tile portion 13 of one adhesive sheet 12.
Make sure to overlap the edges of 3 and the opposite side.
In this way, there will be no gap where there is no tile 11 at the joint between two adjacent adhesive sheets 12. Once the required number of adhesive sheets 12 have been wound around the mandrel 14, filamentous glass fibers 16 impregnated with synthetic resin 15 are then wound around the outer surface of the tile 11, as shown in FIG. The synthetic resin 15 is preferably an epoxy thermosetting resin suitable for bonding ceramics. The properties of the glass fiber 16 are shown by specific numbers as an example: specific gravity 2.56 to 2.58, Mohs hardness 6.5, tensile strength 150 Kg/mm ² , Young's modulus 7500 Kg/mm ² , maximum elongation 4%, The coefficient of linear expansion is 5×10 ⁻⁶ /°C. Several glass fibers 16 are bundled without being knitted, and the winding operation is performed by rotating the mandrel 14 in a fixed direction.
4, but instead of rotating the mandrel 14, the glass fibers 16 may be rotated around the mandrel 14. Furthermore, a certain tension is applied to the glass fiber 16 during winding. And synthetic resin 15 and glass fiber 16
When the glass fiber 16 is wound until the outer surface of the tile 11 is covered, the winding operation is completed and the synthetic resin 15 is hardened by applying heat thereto. When the synthetic resin 15 hardens, the inner tile layer 18
and an outer glass fiber reinforced synthetic resin layer 19 is molded into a pipe-shaped article 17, which is finally
As shown in FIG. 4, the mold is released from the mandrel 14 to obtain a pipe-shaped article 17.

Next, a method of using the pipe-shaped article 17 obtained as described above will be explained with reference to FIGS. 5 and 6. One is to attach a flange 28 to the end of the pipe-shaped article 17 and use it as is, as shown in FIG. The shaped article 17 is inserted into the iron pipe 29 to strengthen the strength.
This is what we use. Before inserting the pipe-shaped article 17, liquid synthetic resin 30 is applied to its outer surface. 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 17.

Effects of the Invention According to the present invention, by sequentially covering the mandrel with tiles and glass fiber reinforced synthetic resin, a pipe-shaped article consisting of an inner tile layer and an outer glass fiber reinforced synthetic resin layer is formed on the outer surface of the mandrel. Because of this, workability is good.

Furthermore, the molding of the glass fiber reinforced synthetic resin layer is
This method involves wrapping filamentous glass fibers impregnated with synthetic resin around tiles, and then curing the synthetic resin.The shrinkage force generated when the resin hardens and the tension of the glass fibers make each tile strong. Since they are integrated, a pipe-shaped article with excellent strength can be obtained.

[Brief explanation of the drawing]

1 to 6 show embodiments of this invention,
Figures 1 to 4 are explanatory diagrams showing the manufacturing process in order;
FIGS. 5 and 6 are explanatory diagrams showing an example of the use of the article according to the present invention, and FIGS. 7 and 8 are explanatory diagrams showing a conventional example, respectively. DESCRIPTION OF SYMBOLS 11... Tile, 14... Mandrel, 15... Synthetic resin, 16... Glass fiber, 17... Article, 18... Tile layer, 19... Glass fiber reinforced synthetic resin layer.

Claims (1)

[Claims] 1. Cover the outer surface of the mandrel 14 by pasting a large number of wear-resistant tiles 11 on it, and cover the outer surface of the tile 11 by wrapping filamentous glass fiber 16 impregnated with synthetic resin 15 on the outer surface of the tile 11. Inner tile layer 1 is formed by curing the synthetic resin 15.
8 and an outer glass fiber reinforced synthetic resin layer 19, and the pipe-shaped article 17 is released from a mandrel 14.