JPH065155Y2 - Heating type for fusion bonding of synthetic resin pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fusion-bonding heating die used for fusion-bonding synthetic resin pipes.

(Prior Art) Generally, a heating type for fusion bonding of a synthetic resin pipe and a joint is
There is a concave heating surface that melts the outer peripheral surface of the pipe and a convex heating surface that melts the inner peripheral surface of the joint, and there is nothing that regulates the insertion length of the pipe and the joint with respect to the heating surface. It was Therefore, as shown in FIG. 1 of Japanese Utility Model Application Laid-Open No. 60-12425, the pipe and the joint are inserted until their end faces come into contact with the heating surface, which causes the end faces to be heated and melted. It was often done. However, since the end surface of the joint is exposed to the outside in the joined state with the pipe, the aesthetic appearance may be impaired and the handling may be hindered.

Therefore, as shown in JP-A-62-13320,
A method has also been performed in which a convex ring is formed in advance on the inner peripheral surface of the joint and the insertion length of the tube is regulated by this convex ring so that the end surface of the tube does not contact the heating surface.

(Problems to be solved by the invention) However, in such a conventional method, unless a synthetic resin pipe such as a joint in which a stopper such as a convex ring is formed on the inner peripheral surface is used, the heating for fusion bonding is performed. There is a problem that fusion bonding cannot be performed depending on the mold.

The present invention focuses on the above problems, and provides a heating type for fusion splicing that can join synthetic resin pipes to each other without restricting the shape of the synthetic resin pipe and exposing the melting surface to the outside. Is an issue.

(Means for Solving the Problems) In order to solve the above-mentioned problems, a heating die for fusion bonding of synthetic resin pipes of the present invention comprises a concave heating surface for melting the outer peripheral surface of one of the synthetic resin pipes to be joined, In a welding device for a synthetic resin pipe provided with a convex heating surface for melting the inner peripheral surface of the other synthetic resin pipe, the insertion length of the synthetic resin pipe is regulated at the base of the convex heating surface. A stopper having a shape that hardly contacts the end surface of the synthetic resin pipe in the inserted state is formed.

(Operation) When joining the synthetic resin pipes by using the fusion mold heating mold for the synthetic resin pipes of the present invention, first, insert one end of the one synthetic resin pipe to the concave heating surface, The outer peripheral surface is heated and melted, and the end portion of the other synthetic resin pipe is inserted into the convex heating surface to heat and melt the inner peripheral surface.

At this time, since the insertion length of the synthetic resin pipe inserted into the convex heating surface is regulated by the stopper and the end face thereof hardly contacts the stopper, the end face is not melted but only the inner peripheral face is melted. To do.

After heating and melting in this way, both synthetic resin pipes are pulled out from the heating surfaces, and the synthetic resin pipes are inserted and fused so that the melting surfaces are joined.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

In the description of the examples, a melting apparatus A for fusion-bonding a pipe B made of a vinyl chloride chloride resin and a joint C will be described as an example.

First, the heating mold for fusion bonding of the first embodiment shown in FIGS. 1 and 2 will be described.

As shown in FIG. 1, the fusion-bonding heating die A of this embodiment is provided with a concave heating surface 3 and a convex heating surface 4 on both sides of a heater plate 2 which is heated by a heater 1. There is.

The inner peripheral surface of the concave portion 31 of the concave heating surface 3 is formed with an inner diameter substantially equal to the outer diameter of the tube B so that the end portion of the tube B can be inserted, and has a taper corresponding to the end shape of the tube B. It is provided.

The convex heating surface 4 is composed of a base 41 provided along the heater plate 2 and a convex portion 42 protruding from the side surface 411 of the base 41, and the protruding length of the convex portion 42 is the joint C. It is formed to be shorter than the length from the end surface 10 to the convex ring 12 formed on the inner peripheral surface 11. Further, the outer peripheral surface 421 of the convex portion 42 is formed with an outer diameter substantially equal to the inner diameter of the joint C so that the end portion of the joint C can be inserted, and is provided with a taper corresponding to the shape of the end portion of the joint C. Has been.

Further, the convex heating surface 4 is formed with an inclined surface 43 extending over both sides of the corner portion formed by the side surface 411 of the base 41 and the outer peripheral surface 421 of the convex portion 42.

This inclined surface 43 serves as a stopper that regulates the insertion length of the joint C, and in order to ensure a sufficient stopper function,
It is desirable to incline the outer peripheral surface 421 of the convex portion 42 by 30 to 60 degrees.

Next, the operation of the first embodiment will be described.

In joining the pipe B and the joint C using the fusion-bonding heating die A of this embodiment, first, the end portion of the pipe B is inserted into the concave heating surface 3, and the outer peripheral surface 13 is heated and melted. At the same time, the end of the joint C is inserted into the convex heating surface 4, and the inner peripheral surface 11 is heated and melted.

At this time, the insertion length of the end portion of the joint C is regulated by the inclined surface 43, and the end surface 10 hardly contacts the inclined surface 43. Therefore, the end surface 10 does not melt and the inner peripheral surface 1
Only 1 melts. Further, the convex ring 12 of the joint C does not melt because it does not contact the convex heating surface 4.

After heating and melting in this way, the pipe B and the joint C are pulled out from the concave heating surface 3 and the convex heating surface 4, respectively, and are inserted and fused so that the melting surfaces are joined.

Here, it is desirable that the pipe B is inserted to a position just before the end surface 14 of the pipe B contacts the convex ring 12 of the joint C. Then, as shown in FIG. 3, the melted resin D flows into the gap between the end surface 14 of the pipe B and the convex ring 12 of the joint C, and the inner peripheral surface 15 of the pipe B and the convex ring 1 of the joint C.
The inner peripheral surface of 2 smoothly continues.

By the way, when the pipe B is inserted and joined until it hits the convex ring 12 of the joint C, the molten resin protrudes from between the end surface 14 of the pipe B and the convex ring 23 of the joint C, and a protrusion is formed by the protruding resin. . The protrusions formed on the inner peripheral surface of the pipe as described above not only hinder the flow of water, but also serve as a factor for generating microorganisms due to stagnant dead water. That is, for example, it becomes unsuitable for use as a piping material for transferring ultrapure water for wafer cleaning used in a semiconductor manufacturing line. Especially, as in the past,
When the side surface of the convex ring of the joint is heated and melted, the amount of resin squeezed out increases and the protrusion also becomes large.

As described above, in the fusion-bonding heating die A of the present embodiment, it is possible to perform the bonding without exposing the melting surface to the outside.

Moreover, since the inclined surface 43 as a stopper for regulating the insertion length of the joint C is provided on the side of the fusion welding heating die A, the joint C
The shape of is not regulated at all. For example, a smooth joint C having an inner peripheral surface without the convex ring 12 may be joined to the pipe B.

Next, a second embodiment will be described.

As shown in FIG. 4, in the heating die A for fusion bonding of synthetic resin pipes of this embodiment, the stopper is an arc-shaped projection 44, and the projection 44 is arranged on the outer peripheral surface 421 of the base of the projection 42. Here is an example.

Note that the other configurations and operations are the same as those of the first embodiment, and thus the description thereof will be omitted.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and even if there is a design change or the like within the scope not departing from the gist of the present invention, it is included in the present invention. Be done.

For example, in the embodiment, the stopper is provided over the entire circumference of the base of the convex heating surface, but it may be provided partially. Further, the shape of the stopper is not limited to the embodiment.

When the protrusion-shaped stopper is provided, its position is not limited to the base of the convex portion as shown in the second embodiment, but may be provided on the side surface of the base.

Further, in the examples, although it was used for joining the vinyl chloride chloride resin pipes, it goes without saying that it is also joined for the synthetic resin pipes such as ethylene resin, fluororesin and vinylidene fluoride resin which cannot be joined with an adhesive. Are suitable.

(Effects of the Invention) As described above, in the heating type for fusion bonding of the synthetic resin tube of the present invention, the shape of the synthetic resin tube is not restricted and the molten surface is not exposed on the outer peripheral surface. Synthetic resin pipes can be joined together.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a fusion-bonding heating die for a synthetic resin pipe according to a first embodiment of the present invention, and FIG. 2 shows a molten state of a pipe and a joint by the fusion-bonding heating die according to the first embodiment. Sectional view, FIG. 3 is a sectional view showing a fusion-bonded state of a pipe and a joint, and FIG. 4 is a sectional view showing a fused state of a joint by a heating mold for fusion-bonding of the second embodiment. A: Heating type for fusion splicing 3: Concave heating surface 4: Convex heating surface 43: Inclined surface (stopper) B: Pipe C: Fitting

Claims (1)

[Scope of utility model registration request] 1. A synthetic resin pipe provided with a concave heating surface for melting the outer peripheral surface of one synthetic resin tube to be joined and a convex heating surface for melting the inner peripheral surface of the other synthetic resin tube. In the welding apparatus, the base of the convex heating surface is formed with a stopper that regulates the insertion length of the synthetic resin pipe and that hardly contacts the end face of the synthetic resin pipe in the inserted state. Heating type for fusion bonding of synthetic resin pipes.