JPH04168033A - Joining method of thermoplastic plastic hose and apparatus thereof - Google Patents

Abstract

PURPOSE:To improve the joint strength by a method wherein the tip parts of hoses are hot-melted under the condition that the tip parts of the hoses are respectively projected by the predetermined length beyond opposing holding devices and opposingly held on the same axis line and, at the same time, the tip faces of the hoses are abutted against each other so as to form a joint having a flanged joint area on the outer peripheral direction. CONSTITUTION:The tip parts of thermoplastic plastic hoses 1 and 1a are hot-melted with heating devices 4 and 4a. At the same time, the tip faces of the hoses 1 and 1a are abutted against each other and pressurized to the direction of the end faces with a pressurizing device 6 so as to melt-weld the right and the left holes 1 and 1a together. The joint of the hoses 1 and 1a under molten state swells to the outer peripheral direction in the shape of a flange and formed by the internally tapered parts 3 and 3a, which are produced in holding devices 2 and 2a and the heating devices 4 and 4a, resulting in realizing the melt-welding having the large bonding area at the flange-shaped joint area. After the hot-welding and fixation by cooling of the right and the left hoses 1 and 1a, the hoses are taken out of the holding devices 2 and 2a. Thus, hot welding is performed easily at low cost and strong tensile strength can be obtained at the joint.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a joining method and apparatus for joining existing thermoplastic hoses by fusion bonding.

``Prior art'' Conventionally, existing thermoplastic hoses have been joined by bonding or fixing them with knots via connecting pipes. No joining was performed by fusion bonding between the end faces.

[Problem to be solved by the invention] In the above-mentioned conventional technology, the work of gluing connecting pipes and assembling work with stopper bands is complicated and time-consuming, and it is also difficult to use separate fittings such as connecting knobs when joining. It was not suitable for this purpose due to the need for parts, increased costs for separate parts, and production efficiency.

In addition, the conventional method of joining thermoplastic plastic hoses by fusing them together has low tensile strength and leaks from pinholes in the joint, making it unusable, so we developed a new technology. development was desired.

Therefore, the present invention solves the above-mentioned drawbacks, and is an inversion of existing thermoplastic hoses.It does not require separate parts or complicated assembly work, can be easily fused and bonded at low cost, and has strong tensile strength. There is no risk of leakage from pinholes in the joint, and the inner surface of the joint is smooth.
The purpose of this invention is to provide a method and device for joining thermoplastic hoses that can be adhesively joined.

In addition, in order to eliminate the above-mentioned drawbacks, the first method for joining thermoplastic plastic hoses includes connecting the distal ends of the thermoplastic plastic hoses to a predetermined length to each of the opposing holding devices. The hoses are made to protrude and are held facing each other on the same axis, and the tips of the hoses are heated and melted, and the base end surfaces of the hoses are brought together and pressurized in the end surface direction, so that the joint portion of the hose is shaped like a brim in the outer circumferential direction. It is characterized by being protruded and fusion-bonded.

The second method for joining thermoplastic plastic hoses is characterized in that the end faces of the thermoplastic hoses to be joined are formed into an internal taper in advance and fused layer joining is performed.

The first thermoplastic hose joining device includes a holding device that holds the distal ends of the thermoplastic hoses to be joined by protruding a predetermined length, and respective holding portions that are close to the distal ends of the hoses when the hoses are held. 11
A part of the inner taper is formed on the i1 surface side, and the holding device is arranged to face each other on the same axis and has a pressurizing device that applies pressure in the axial direction, and a heating device that heats the vicinity of the tip of the hose. It is a feature.

"Function" According to the method and structure described above, the parts near the ends of the thermoplastic hoses, which are held facing each other on the same axis, are heated and when they are in a molten state, the hose ends #1 are brought together and applied in one direction. When pressed, the tips of the hoses bulge in the outer circumferential direction, forming a brim shape to be molded into a part of the inner taper of the holding portion, and are fusion bonded.

Furthermore, if the ends of the thermoplastic hose are formed in advance into an inner taper to form a melting layer, it will easily swell in the outer circumferential direction and will be fused and bonded without melting into the inner space of the hose.

"Example" The present invention will be described in detail below based on an illustrative example.

When bonding existing thermoplastic plastic hoses (hereinafter referred to as hoses), Figure 1, Figure 2 and '@
In the first embodiment shown in FIG. 3, first, the portions near the tips of the left and right hoses 1.1a are made to protrude a predetermined length from the dog holding device 2.2a and are held by the holding device 2.2a.

In its holding, the hose 1.1a as shown in FIG.
The holding bag #2.2a and the heating device 4.4a are formed into a shape corresponding to the cough hose 1.1a so as to fit and hold the holding bag #2.2a and the heating device 4.4a respectively. The heating device 4.4a was
ii. Heat the hose 1.1a 1770 and slide the heating device 4.4a up and down via the support rod 5.5a to fit and hold it together with the holding device 2.2a.

In addition, the sheet holding device 12.2a and the heating device 4.4a are
When the hose 1.1a is held at W, the ends facing each other on the same axis [the holding device near the tip of the hose 1.1a on the fi side] Ii2.2a and the end faces of the heating device 4.41L An inner tapered capital 3.3a is formed at the position.

Then, the tip of the hose 1.1a is connected to a heating device f4.4.
At the same time as heating and melting the hoses 1 and 1a, the four ends of the hoses 1 and 1a are butted together and pressurized using a pressure device 6 using an actuator such as a one-sided blow cylinder to fuse each of the left and right hoses 1.1 atl. Join.

When the molten hose 1.1a is joined, the joint portion of the molten hose 1.1a bulges in the outer circumferential direction like a brim, and the holding device 2.
2a and the inner taper portion 3 formed in the heating device 4.4a.
．． -N of the joint l formed in 3a and formed in the shape of a brim
A large area is fused and bonded.

Then, the left and right hoses 1 and 1a are fused together and removed from the cooled and identified trowel and the holding device 2a.

9. When the fusion S is fitted together, some melting may occur on the inner surface of the joint of the left and right hoses 111a, but as shown in FIG. When the hoses 1 and 1a are fitted together and @N bonded, there is no melting on the inner surface of the hose 1.1a, and the inner surfaces of the joint portion of the hoses 1 and 1a can be smoothly fused and bonded.

In addition, 8 in the figure is a spring-like body 8 when the cylindrical forming material 7 is thrown out from the joint part of the hose 1.1a, and it may not be spring-like but may be string-like as long as it is compatible. Also,
When weaving the cylindrical forming material 7 from the joint of the hose 1.1a after weaving the cylindrical forming material 7 by welding without providing the spring-like body 8, pressure such as air is applied to one side of the hose 1sla. It is also possible to take it out by blowing it away, but this is not shown.

The second embodiment shown in FIG. 5 is substantially the same as the first embodiment, except that an inner tapered portion 9.9a is formed in advance on the end surface of each of the left and right hoses 1.1a. As a result, when the tip of each hose 1.1a melts, it easily swells in the outer circumferential direction, and the melting on the inside of the hose 1.1a is reduced, so that the joint on the inside of the hose 1.1a is smooth.
A t-junction is produced.

As another embodiment shown in FIG. 6, when a large diameter hose 1o and a small diameter hose loa are fused and joined together for fusion joining of different diameter hoses, the length of joining the small diameter hose 10 & to the large diameter hose 10 is 2, and hold the part to be joined with the holding device 2.
b [After fitting, the heating device 4b having one electrode of the high frequency welder is slid up and down via the support rod 6 to be fitted and held together with the holding device 2b.

Then, the heating device 11 having the other electrode is attached to the support rod 5.
, and insert it from the end of the large-diameter hose 10 to the position of the heating device 4b.

Therefore, the hoses of different diameters are heated by the heating device 4b and the heating device Tt11 of the high-speed steel holder, and the hoses of different diameters are fused and joined, and after cooling, they are removed from the holding device 2b.

In addition, high frequency welder's 7JO heating device 4.
4a, 4b, and 11 are used, but a device for partially heating the FrEK, such as a normal heater or hot air, may also be used, but illustration is omitted.

"Effect" The intended purpose was effectively achieved by the above-mentioned joining method, structure, and action based on zero invention, and 41! ! FK, the distal ends of thermoplastic hoses are made to protrude a predetermined length from the opposing holding devices, and are held facing each other on the same axis, and the distal ends of the hoses are heated and melted, and the distal ends of the hoses are butted together. Pressure is applied in the direction of the end face of the hose, and the joint part of the hose protrudes like a brim in the direction of the outer circumference and is fused and joined.Therefore, there is no need for separate parts or complicated assembly work, and the process can be easily performed at low cost. Bonding can be done quickly, the bonding area is large, and strong tensile strength can be obtained, and there is no leakage from pinholes in the joint.

In addition, by forming the tip end surface of the thermoplastic plastic hose into an internal taper and fusion bonding, there is less melting on the inner surface of the fusion joint of the hose, and the inner surface of the fusion joint of the hose can be fused and bonded cleanly. .

Roughly speaking, butt joints of hoses of the same diameter and hoses of different diameters?
Since the IIi layer bonding has been adjusted to the DJ function, hoses can be connected and bonded simply, and the variety of uses has been expanded, which will have a significant effect.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of the main parts of the first embodiment, and FIG.
A side view of gravel taken along the arrow A-A in Fig. 1, Fig. 3 is a front sectional view of the main part, Fig. 4 is a front sectional view of the main part, and Fig. 5 is the main part of the second embodiment. The front sectional view, Figure 6, is
FIG. 7 is a front sectional view of main parts of another embodiment. 1.1a: Hose, 2.2a: Holding device, 3.3a: Part of inner taper, 4.4a: Heating device, 6: Pressure device, 9.9a: Part of inner taper. Akihito Hoshikyoda Yuasa Co., Ltd. Representative Nureyuri Masaru Figure 1 Figure 2 Figure 4 ■ Figure 5 Figure 6

Claims (3)

[Claims] (1) The distal ends of the thermoplastic hoses are made to protrude a predetermined length from the opposing holding devices, and are held facing each other on the same axis, and the distal ends of the hoses are heated and melted, and the distal end surfaces of the hoses are protruded. A method for joining thermoplastic plastic hoses, characterized in that the hoses are fused and joined by applying pressure in the direction of the end faces so that the joined portions of the hoses protrude in a flange-like direction toward the outer periphery. (2) The method for joining thermoplastic plastic hoses according to claim 1, wherein the distal ends of the thermoplastic hoses to be joined are formed in advance to have an internal taper and then fused and joined. (3) A holding device that holds the distal ends of the thermoplastic hoses to be joined by protruding a predetermined length, and an internal tapered portion formed on the end surface side of each holding portion that is close to the distal end of the hose when held. A thermoplastic hose joining device comprising: a pressurizing device that presses the holding devices in the axial direction while facing each other on the same axis; and a heating device that heats the vicinity of the tip of the hose. .