JPH0356537B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a ceramic lined pipe.

Conventionally, in order to manufacture ceramic lined pipes, small ceramic plates were attached one by one to the inner peripheral surface of the pipe body using an adhesive, which posed the problem of requiring a great deal of effort. Further, in the case of long pipes of medium and small diameters where it is difficult to reach the center of the pipe, ceramic lining is not possible. Furthermore, as shown in FIG. 11, a method has also been proposed in which ceramic plates C are arranged on the surface of a rubber plate E, which is manufactured in advance and then affixed to the inner peripheral surface of the pipe P. It is quite difficult and time-consuming to affix the entire surface of the rubber plates uniformly and reliably, and there is a gap D between the rubber plates, which requires work to be filled. The problem was that it could not be applied.

SUMMARY OF THE INVENTION In view of these conventional problems, an object of the present invention is to provide a method for manufacturing a ceramic lined pipe that is easy to work with and can be applied to long pipes of medium and small diameters.

For this reason, the present invention provides a flexible plate-like body made by arranging ceramic pieces on the surface of a plate-shaped unvulcanized rubber, which is wound around the outer periphery of a mandrel with the ceramic pieces inside, and its side edges are joined to make it flexible. A cylindrical body is formed, this flexible cylindrical body is inserted into the tube body and pressed against the inner peripheral surface of the tube body, and the unvulcanized rubber is vulcanized and the rubber and the ceramic piece and the rubber and the tube body are bonded by baking. By doing this, there is no need to attach ceramic pieces or rubber plates, making the work simple, and it can be applied to long medium- and small-diameter pipes without any problems by simply lengthening the flexible cylindrical body. Furthermore, the present invention provides a method for manufacturing a ceramic lined pipe in which the rubber is completely cylindrical and does not form any gaps.

The ceramic pieces may be rectangular, polygonal, or circular ceramic plates, or may be spheres or granules, but
If the rectangular ceramic plates are arranged without any gaps,
The inner circumferential surface of the tube can be completely lined with ceramics. Furthermore, it is common practice to place ceramic pieces all around the inner circumference of the pipe, but if there is a specific area that will wear out, such as when transporting slurry, ceramic pieces can be placed only in that area. You may do so.

Hereinafter, an embodiment in which the method of the present invention is suitable for manufacturing a ceramic lined pipe in which small ceramic plates are arranged without gaps on the inner circumferential surface of a long medium- and small-diameter pipe will be described with reference to FIGS. 1 to 6. do. First, the structure of the ceramic lined pipe to be manufactured will be explained with reference to FIGS. 1 to 3. 1 is a ceramic lined pipe in which a ceramic lining layer 3 is formed inside a pipe body 2 made of a steel pipe, cast iron pipe, or synthetic resin pipe. It's a pipe. For example, the tube body 2 has an inner diameter D of 400 mm or less and a length L of 1.5 m or more, and it is impossible to reach out from the outside of the tube body and manually form the ceramic lining layer 3 in the center of the tube body. It is. The ceramic lining layer 3 is formed by arranging small ceramic plates 4, each having a rectangular shape of 10 to 25 mm on a side and a thickness of 1 to 3 mm, in a cylindrical shape closely to each other without any gaps. A seamless cylindrical rubber layer 5 is interposed between the outer periphery of the ceramic lining layer 3 and the inner periphery of the tube body 2. This cylindrical rubber layer 5 has a required thickness adjusted so that its outer circumferential length matches the inner circumferential length of the tube body 2 and its inner circumferential length matches the outer circumferential length of the ceramic lining layer 3. are doing. That is,
This rubber layer 5 forms a ceramic lining layer 3 with no gaps between the small ceramic plates 4. This rubber layer 5 is formed to have a thickness of approximately 2 to 3 mm. According to such a ceramic lined pipe, even when used for pneumatic transport of highly hard powdered materials, the ceramic lined layer 3 formed on the inner circumference allows long-term use, and the small ceramic plates Since there is no gap between the tubes 4, there is no possibility that the rubber layer 5 or the tube body 2 will be partially worn out and holes are formed.

Next, the method for manufacturing the ceramic lined pipe 1 will be explained with reference to FIGS. 4 to 6.
First, small ceramic plates 4 are laid out without gaps in a mold having a width corresponding to the inner peripheral length of the ceramic lined pipe 1 and a length corresponding to the pipe length, and an unvulcanized rubber plate 5a of an appropriate thickness is placed on top of the ceramic plates 4. or press the small ceramic plates 4 on the unvulcanized rubber plate 5a with no gaps between them. By cutting to the corresponding length, a small ceramic plate 4 as shown in Fig. 4 is made.
A flexible plate-like body 6 is formed from the rubber and the unvulcanized rubber 5a. Next, this flexible plate-like body 6 is placed on a mandrel 7.
Wrap the small ceramic plate 4 around the circumferential surface of the container with the ceramic plate 4 inside. The diameter of the mandrel 7 is the same as that of the flexible plate-like body 6.
The diameter is set to be the same as the inner circumferential diameter when the ceramic plate is wound into a cylindrical shape, so that the small ceramic plates 4 are fitted around the outer periphery of the mandrel 7 in a cylindrical arrangement with no gaps. In this state, a tape-like cloth 8 is wrapped around the outer periphery of the flexible plate-like body 6 and tightened, and the unvulcanized rubber 5 is tightened.
The side edges of the flexible plate-like body 6 are joined by pressing the side edges of the flexible plate-like body 6 to form the flexible cylindrical body 9.
At this time, a thin unvulcanized rubber plate is inserted into the outer surface of the flexible plate-like body 6 as necessary so that the outer circumferential length of the flexible cylindrical body 9 matches the inner circumferential length of the tube body 2. In addition, the unvulcanized rubber 5a is attached to the side edge of the flexible plate-like body 6.
The side edges of the ceramic plate 4 may be extended from the side edges of the small ceramic plate 4, and the extended portions may be overlapped and wrapped on the outside when being wound around the mandrel 7, thereby making the connection of the side edges more complete. In this case, the unvulcanized rubber 5a It is preferable to gradually reduce the thickness of both side edges. After that, the tape-like cloth 8 is removed, and the mandrel 7 is removed from the flexible cylindrical body 9.
is pulled out, and an inflatable support 10 as shown in FIG. 6 is inserted in its place, and the flexible cylindrical body 9 is supported by this support 10. The support body 10 is composed of a rigid support piece 11 and a cylindrical bag body 12 that can be expanded by supplying pressure fluid thereinto. Note that even if the support body 10 is composed of only the cylindrical bag 12, the cylindrical shape of the flexible cylindrical body 9 is maintained by the cylindrical bag 12, thereby making the flexible cylindrical body 9 self-supporting. be able to. Further, the cylindrical bag 12 may be made of a stretchable sheet such as rubber, or may be made of a flexible sheet. In this way, after a part of the flexible cylindrical body 9 is recessed inwardly while being supported by the support body 10 and inserted into the tube body 2 as shown in FIG. is supplied to inflate the cylindrical bag 12 and press the flexible cylindrical body 9 against the inner surface of the tube body 2. The outer diameter of the flexible cylindrical body 9 is formed to be slightly smaller than the inner diameter of the tube body 2, and it is inserted into the tube body 2 without being dented, and the flexible tube is expanded by the expansion of the support 10. The shaped body 9 may be slightly expanded in diameter and brought into pressure contact with the inner circumferential surface of the tube body 2. Thereafter, this is inserted into a furnace, and the unvulcanized rubber 5a is vulcanized to form a rubber layer 5, and at the same time, this rubber layer 5, the tube body 2, and the ceramic plate 4 are baked and bonded to be integrated. . Incidentally, the inner surface of the tube body 2 and the small ceramic plate 4 are coated with an adhesive for baking and bonding rubber in advance.

The easiest way to arrange the ceramic plates 4 is to arrange them in a checkerboard pattern along the tube axis direction and the circumferential direction as shown in FIG. 7, but as shown in FIG. When arranged in a staggered manner, even if there is a slight gap between the ceramic plates 4,
Since the gap is not continuous for a long time in the tube axis direction, it has the advantage that wear and tear is less likely to occur.

Further, in the above embodiment, the ceramic platelets are arranged on the inner circumferential surface of the pipe body without any gaps, but the method of the present invention is not limited to the production of such ceramic lined pipes; for example,
As shown in FIG. 9, it is also possible to form a ceramic lining layer 3 made of small ceramic plates 4 only on the lower half of the tube body 2, and only the rubber layer 5 on the upper half. Such a ceramic lined pipe 21 is suitably used in cases where abrasion of the lower part is a problem, such as when transporting slurry. Furthermore, the present invention is applicable not only to straight pipes but also to curved pipes.
In that case, the ceramic lining layer 3 may be formed only on the outer half of the periphery with respect to the center of curvature, which is susceptible to wear and tear. Further, the ceramic lining layer 3 itself is not limited to the one using ceramic platelets 4, but may also use ceramic balls 32 or ceramic granules as in a ceramic lined pipe 31 shown in FIG. In this case as well, the flexible plate-like body 6 can be formed in the same manner as in the case of the ceramic plate 4, and the subsequent steps can be carried out in the same manner.

According to the method for manufacturing a ceramic lined pipe of the present invention, as is clear from the above description, the conventional work of pasting ceramic pieces one by one or pasting a rubber plate on which ceramic pieces are arranged can be avoided. This eliminates the need to form a ceramic lining layer easily and efficiently. Furthermore, it becomes possible to line long medium- and small-diameter pipes with ceramic, which was previously impossible. Furthermore, since the rubber layer has a completely cylindrical shape, corrosive fluid can be passed through the tube body, which brings about great effects.

[Brief explanation of drawings]

1 to 3 show an example of a ceramic lined pipe to which the method of the present invention is applied. FIG. 1 is a schematic front view of the external appearance, FIG. The figure is an enlarged sectional view of the main part of Figure 2, and Figure 4.
6 to 6 show the manufacturing process of an embodiment of the method of the present invention, FIG. 4 is a perspective view of a flexible plate-like body, FIG. 5 is a perspective view of the process of forming a flexible cylindrical body, and FIG. Fig. 6 is a cross-sectional view of the process of inserting the flexible cylindrical body into the tube body, Figs. 7 and 8 are plan views showing an example of the arrangement of ceramic plates, and Figs. 9 and 10 are respectively views of the present invention. Other examples of ceramic lined pipes to which the method can be applied are shown, FIG. 9 is a sectional view, FIG. 10 is a sectional view of the main part, and FIG. 11 is a sectional view similar to FIG. 3 showing a conventional example. . 1, 21, 31 are ceramic lined pipes, 2 is a pipe body, 3 is a ceramic lining layer,
4 is a small ceramic plate, 5 is a rubber layer, 5a is unvulcanized rubber, 6 is a flexible plate, 7 is a mandrel, 9 is a flexible cylinder, 10 is a support, 12 is an inflatable cylinder Bag body.

Claims (1)

[Claims] 1. A flexible plate-shaped body made by arranging ceramic pieces on the surface of a plate-shaped unvulcanized rubber is wrapped around the outer periphery of a mandrel with the ceramic pieces inside, and the side edges are joined to form a flexible cylindrical body. The flexible cylindrical body is inserted into the tube body and pressed against the inner circumferential surface of the tube body, and the unvulcanized rubber is vulcanized and the rubber and the ceramic piece and the rubber and the tube body are attached by baking. A method for manufacturing ceramic lined pipes.