JPS624994A - Method of blocking through-hole of resin pipe in which through-hole in pipe axial direction is formed to pipe wall - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for closing holes in a resin tube in which holes are arranged in parallel in the axial direction of a tube IK.

(Prior art) Making the pipe wall of a resin pipe such as a hard vinyl chloride resin pipe relatively thick and forming a large number of through holes in the pipe axis direction in the pipe wall.
Attempts have been made to reduce the weight of fat pipes, improve their strength against flat loads, and reduce deformation due to stresses such as earth pressure. A method and apparatus for manufacturing such a resin pipe are proposed in Japanese Patent No. 52-89170. The resin pipe manufactured by this method and apparatus is
Since the through hole formed in the pipe wall in the pipe axial direction is continuous and communicates with both end walls of the pipe, the conventional general connection method is to expand the diameter of one end and use it as a pipe socket. Expanding the diameter of the tube 1. The method of inserting the blank end and connecting with adhesive, a seal ring, etc. has the disadvantage that the through hole in the tube wall communicates with the inside and outside of the tube, causing fluid leakage, and it cannot be used as is.

For example, in Japanese Patent Application Laid-Open No. 52-52222, a method for crushing the through hole by heating the tube end and pressing it into a mold, or a method for crushing the through hole by heating the tube end and pressing it into a mold, or a method for crushing the through hole by heating the tube end and pressing it into a mold, or a method for crushing the through hole by heating the tube end and pressing it into a mold, or a method for crushing the through hole by heating the tube end and pressing it into a mold, or by inserting a protrusion of a ring having a cylindrical protrusion into the tube end surface. Means for charging into the hole have been proposed.

[Problems to be Solved by the Invention] However, in the former hole closing method, the ends of the resin pipes are heated as they are and pressed into the mold, so the connecting partitions of the resin pipes are not easily compressed. It becomes an obstacle and is difficult to block. Therefore, in the above-mentioned publication, an attempt is made to seal the mold by rotating and pressing mold II, twisting the connecting partition wall, and pressing the inner and outer walls against each other. is not necessarily sufficient,
There is a problem that fluid leakage cannot be completely prevented. −
On the other hand, in the latter hole closing method, it is extremely difficult to align each through hole with the cylindrical protrusion of the ring, and it is also extremely difficult to perfectly match the size of the through hole and the cylindrical protrusion. Since it is difficult, it takes a lot of effort to close it, and there is a problem that the sealing performance of the closed part is not sufficient.

The present invention has been devised in view of the above-mentioned conventional problems, and its purpose is to provide a method for easily and reliably closing a through hole in a short time using a very simple method. There is a particular thing.

(Means for solving the problem) The method for closing a through hole of the present invention has inner and outer walls and a connecting partition in the tube axis direction that connects the inner and outer walls, and the connecting partition connects the tube wall in the tube axis direction. A ring-shaped #i conductive substrate is interposed on the end surface of a resin tube in which a through hole is formed, and a resin ring is pressed.Then, the conductive substrate is heated by high-frequency induction heating, and the conductive substrate is heated. The gist of this method is to fuse the resin ring to the end surface of the resin pipe by melting the resin in the portion that contacts the base material.

(Function) The ring-shaped conductive base material is heated by high-frequency induction heating and generates heat. B The heat generated melts the resin in the portions that are in contact with the conductive base material, that is, the end surface of the resin tube and the side surface of the resin ring. First, the resin ring is fused to the end surface of the resin tube with a conductive base material interposed therebetween. As a result, the through hole opening of the resin pipe is closed with the resin ring.

(Example) Next, a method for closing a through hole according to the present invention will be described with reference to an example shown in the drawings.

It is a single resin tube, and as shown in Figure 1, the outer
1, the inner wall 12, and connecting partition walls 13, 13 in the tube axis direction that connect these two walls are integrally provided, and through holes 14, 14 in the tube axis direction are provided in the tube wall.・is formed.

This resin pipe 1 is obtained by continuously extruding a hard vinyl chloride resin or the like using an extrusion molding method and cutting the resin pipe into a predetermined length. The resin tube 1 may be a true round tube or an oval tube. Reference numeral 2 denotes a ring-shaped conductive base material, the inner and outer diameters of which are approximately equal to the inner and outer diameters of the resin tube 1.

Examples of the conductive base material 2 include wire mesh, perforated metal plate, and
A resin plate containing conductive powder such as iron oxide is used. In the case of a wire mesh, the surface may be coated with a hot melt adhesive or may be integrated.

3ii resin ring, its inner diameter and outer diameter are 1! t'' are approximately equal to the inner and outer diameters of the resin tube 1. Even if the material of the resin ring 3 is the same as the material of the resin tube 1,
They may be different.

Reference numeral 4 denotes a mold for fusion splicing, and the mold has an IYU-shaped cross section and has an annular groove 41 equal to the thickness of the wall of the resin tube 1. A resin ring 3 and a conductive base material 2 are inserted into the four parts 11141. A coil 5 for high frequency application is buried inside the gold layer 4. The mold 4 is provided so as to be movable to the suppression device (not shown) K, YO#)I# fat 1 side.

Next, the process of closing the tube end surface through hole of the resin tube will be explained with reference to FIGS. 2 and 3.

As shown in FIG. 2, the resin ring 3 and the conductive base material 2 are inserted into the groove 41, the mold 4 is moved by a pressing device, and the end of the resin tube l is inserted into the groove 41. is inserted to press the conductive base material 2 onto the tube end surface.

Next, a high frequency voltage is applied to the coil 5.

The conductive base material 2 is heated and generates heat due to the induction heating effect caused by the application of the high frequency voltage. As a result, the side surface of the resin ring 3 in contact with the conductive base material 2 and the end surface of the resin pipe l are melted 17, and the three resin rings are fused to the end surface of the resin pipe l through the conductive base material 2. Through hole 14.14...
is occluded.

In the present invention, one end of the resin pipe may be processed to have a diameter enlarged socket.

As shown in FIG. 4, the flanges 31a and 32a are integrally extended 1 and the resin ring 3 has a substantially U-shaped cross section.
You may use a. In addition, ring 3a flange 31m
+32a may be absent.

(Effects of the Invention) As described above, the present invention provides a ring-shaped conductive base on the end surface of the resin pipe when closing the through hole of the resin pipe in which the through hole in the tube axis direction is formed in the outer wall. Suppressing the resin ring by interposing a material [7] However, since this is done by reducing the heat generation of the conductive base material by high-frequency induction heating, there is no need for top-of-the-furnace operations such as rotating the suppression mold as in the past. The through hole can be easily blocked. Further, since the closed portion of the passage fL is reinforced with a conductive base material, the closed portion has excellent impact resistance. In particular, when the conductive base material is a wire mesh, a particularly remarkable reinforcing effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view showing an example of a resin pipe whose through hole is closed by the through hole closing method of the present invention, and FIGS. 2 and 3 are cross sections of essential parts showing an example of the closing method according to the present invention. FIG. 4 is a sectional view showing an example of the le-shaped ring. DESCRIPTION OF SYMBOLS 1...Resin pipe, 11...Outer wall, 12.Inner wall, 13.
- Connecting partition wall, 14-... Through hole, 2... Conductive base material 3-...
・Resin ring, 4...mold, 5 coil.

Claims (1)

[Claims] 1. A ring-shaped resin tube is installed on the end surface of a resin tube that has inner and outer walls and a connecting partition in the tube axis direction that connects the inner and outer walls, and a through hole in the tube axis direction is formed in the tube wall by the connecting partition. A resin ring is pressed with a conductive base material in between, and then the conductive base material is heated by high-frequency induction heating to melt the resin in the portion that is in contact with the conductive base material, and the resin ring is inserted into a resin pipe. A method for closing a hole in a resin tube having a hole in the tube axis direction formed in the tube wall, the method comprising: fusing the hole to the end surface of the tube.