JPH05169432A - Manufacture of transporting pipe for powder body - Google Patents

Abstract

PURPOSE:To provide a manufacture of a transporting pipe for a power body whose finish of an end face is improved without performing annoying operation in relation to the transporting pipe for the powder body obtained by lining an inner circumferential surface of a steel pipe with a ceramic pipe. CONSTITUTION:The title method is constituted so that in a transporting pipe for a powder body which is provided with a steel pipe 1, a ceramic pipe 3 inserted into the steel pipe 1, an indeterminate form refractory filled into an air gap between the steel pipe 1 and ceramic pipe 3 or a filled layer 2 by mortar and an end face S of the filled layer 2 is coated with a protective layer 4 by a monomer forming an early strength coating, for example, of alpha-cyanoacrylate monomer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport pipe for powder or the like, in which the inner peripheral surface of a steel pipe is lined with a ceramic pipe, and a manufacturing method thereof.

[0002]

2. Description of the Related Art In order to improve the durability of a transport pipe which serves as a powder feed route for high pressure air, the inner peripheral surface of the steel pipe is lined with a ceramic pipe having excellent wear resistance. .. Such a transport pipe, as shown in FIG.
The ceramic pipe 3 is inserted into the steel pipe 1, and the space between the steel pipe 1 and the ceramic pipe 3 is filled with a filling material such as mortar or amorphous refractory and solidified to form the filling layer 3. To be done.

The filler has adhesiveness to both ceramics and metal, has strength after hardening, and has 10 voids between the ceramic pipe and the steel pipe.
Even if the thickness is less than or equal to mm, it is required to satisfy the conditions such as being able to be densely packed, and conventional amorphous refractory materials are often used.

However, since the amorphous refractory material generally has a large shrinkage due to drying, when only the amorphous refractory material is used as the filler and dried, the filling layer 2 is depressed from the end surface S, Further, there is a problem that the raw material having a large particle diameter, which is mixed with the amorphous refractory, floats on the portion and stands out. Therefore, the filling amount of the above-mentioned irregular refractory material is adjusted to a little small amount, or the dry irregular refractory material is scraped off to make the end face as the main filling layer 2a be depressed more than the end face of the steel pipe 1 or the ceramic pipe 3. Further, the work of filling the mortar, which has a smaller shrinkage amount and composed of fine particles, into the depressed portion to form the sub-filling layer 2b is performed.

[0005]

However, in addition to the low solidification strength of the mortar with which the end face is filled,
There is a drawback that the mortar is likely to fall off without being bonded to the solidified amorphous refractory.

Further, when the mortar constituting the sub-filling layer 2b takes a long time to harden, and especially when the gap between the steel pipe 1 and the ceramic pipe 3 is as narrow as about 3 mm or less, the steel pipe 1 There is also a drawback that complicated work such as fixing the ceramic tube 3 with a jig is required.

The present invention has been proposed in view of the above conventional circumstances, and an object of the present invention is to provide a method of manufacturing a transport pipe for powder or the like which can improve the finish of the end face without performing a troublesome work. And

[0008]

In order to achieve the above object, the present invention adopts the following means. That is, FIG.
Further, as shown in FIG. 2, the ceramic pipe 3 is inserted into the steel pipe 1, and the space between the steel pipe 1 and the ceramic pipe 3 is filled to form a filling layer 2 made of an amorphous refractory or mortar. A method for manufacturing a transport tube for powder or the like, which comprises forming a protective layer 4 by adhering a monomer forming a rapid-strength coating to the end surface S of the filling layer 2 in the method for manufacturing a transport tube for powder, The protective layer 4 is preferably composed of an alpha cyanoacrylate-based monomer.

[0009]

According to the above construction, when the end surface S of the filling layer 2 mainly composed of mortar is coated with the monomer forming the early-strength coating, the dropping of the filling layer 2 can be prevented.

Particularly, when an alpha cyanoacrylate-based monomer is adopted as the above-mentioned monomer, since the alpha-cyanoacrylate-based monomer is a low-viscosity liquid,
A protective layer 4 having sufficient strength to prevent the falling of the filling layer 2 is formed by penetrating into the pores of the end surface S and being instantaneously cured by a small amount of water contained in the filling layer 2. To do.

[0011]

EXAMPLES The present invention will be described below with reference to examples. <Example 1> Amorphous refractory A prepared by kneading the compounds shown in Table 1 below, and the irregular refractory A in mesh 1
A coarse particle portion was cut through a sieve of mm to prepare an irregular shaped refractory material B.

In the first embodiment, as shown in FIG. 1, a steel pipe 1 and a ceramic pipe 3 inserted while keeping a gap between the steel pipe 1 and the steel pipe 1 at a thickness of 7 mm are fixed, and first, an amorphous refractory material A is formed. The main packing layer 2a was formed by pouring it to a position 5 to 10 mm from the tube end of the transport tube and solidifying it. Next, in the figure, the main filling layer 2a
The amorphous refractory B was poured from above to the pipe end of the transportation pipe and cured to form the sub-filling layer 2b. After a predetermined drying time, the alpha cyanoacrylate-based monomer was applied to the end surface S of the sub-filling layer 2b. The alpha cyanoacrylate-based monomer quickly penetrated into the end surface of the sub-filling layer 2b and was rapidly cured in about several seconds to form the protective layer 4. Even if the surface of the protective layer 4 was rubbed with a finger, it was not peeled off.

Example 2 An amorphous refractory material A prepared by kneading the compounds shown in Table 1 below and a mortar C prepared by kneading the compounds shown in Table 2 were prepared.

In the second embodiment, as shown in FIG.
Then, the ceramic pipe 3 inserted while keeping the gap between the steel pipe 1 and the thickness of 2 mm is fixed, and first, the amorphous refractory A is poured to a position 5 to 10 mm from the pipe end of the transport pipe to solidify. The main filling layer 2a was formed. Next, in the figure, mortar C was poured from above the main packing layer 2a to the pipe end of the above-mentioned transport pipe and cured to form the sub packing layer 2c.

In this case, since the thickness of the void is small,
The mortar C was dried by inserting thin wood pieces 10 into this space at three locations in the circumferential direction of the tube so as not to cause misalignment during drying. After completion of the drying, the alpha cyanoacrylate-based monomer was applied to the end surface S of the sub-filling layer 2c so as not to touch the wood chips 10. The alpha cyanoacrylate-based monomer quickly penetrates into the end surface S of the filling layer 2b,
The protective layer 4 was formed by rapid curing in a few seconds. Then, after hardening, the wood piece 10 was pulled out, the place where it was pulled out was similarly filled with mortar A, and after drying, the alpha cyanoacrylate-based monomer was applied dropwise. Even if the surface of the protective layer 4 was rubbed with a finger, it was not peeled off.

[0016]

[Table 1]

[0017]

[Table 2]

[0018]

As described above, according to the present invention, the end face of the filling layer made of amorphous refractory or mortar for adhering and fixing the ceramic pipe to the steel pipe to each other is made of, for example, alpha cyanoacrylate monomer. By coating with a protective layer made of a monomer that forms a very early-strength coating, it is possible to manufacture a transport pipe for powder or the like having an improved end surface finish.

In particular, since the above-mentioned alpha cyanoacrylate-based monomer has a low viscosity, it quickly penetrates into the filling layer and absorbs moisture contained in the filling layer to cure rapidly, so that The end face can be rapidly treated by an extremely simple method such as dropping on the end face, and a part of the filling layer can be prevented from falling off.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an essential part of an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a main part of another embodiment of the present invention.

FIG. 3 is a schematic perspective view of a transport pipe for powder or the like.

[Explanation of symbols]

 1 Steel pipe 2 Filled layer 3 Ceramics pipe 4 Protective layer S End surface

Claims (2)

[Claims] 1. A ceramic pipe (3) is inserted into a steel pipe (1), and the space between the steel pipe (1) and the ceramic pipe (3) is filled with an unshaped refractory or a mortar filling layer (2). In the method for producing a transport pipe for powder or the like, the protective layer (4) is formed by attaching a monomer forming a fast-strength coating to the end surface (S) of the filling layer (2). A method of manufacturing a transport pipe for powder or the like, characterized by: 2. The method for manufacturing a transport pipe for powder or the like according to claim 1, wherein an alpha cyanoacrylate-based monomer is adopted as the monomer.