JP2013015171A - Ring-fitted soft resin pipe and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ring-fitted soft resin pipe which improves workability while suppressing the waste of an adhesive, suppressing the deterioration of appearance caused by the dripping of the adhesive or the like and suppressing the generation of adhesion irregularities when adhering a hard resin ring to the outer periphery of the soft resin pipe in order to prevent the deformation of a soft resin pipe.SOLUTION: In a hard resin ring 1 which is constituted to be adhered to the outer periphery of a soft resin pipe 3 with a liquid adhesive 4, the inner peripheral face of the hard resin ring 1 has a plurality of communication grooves 2 in parallel to an axial direction of the hard resin ring 1 and a peripheral groove 5 circumferentially continuous to keep the inside of each of the communication grooves 2 and the inside of the peripheral groove 5 communicating with each other so that the liquid adhesive 4 spreads over the inner face of the hard resin ring 1 through the medium of each of the communication grooves 2 and the peripheral groove 5.

Description

  The present invention relates to a ring-mounted soft resin pipe in which a hard resin ring is bonded to the outer periphery of the soft resin pipe in order to prevent deformation of the soft resin pipe, and a manufacturing method thereof.

  The ring-mounted soft resin pipe as described above is assembled by bonding the hard resin ring on the outer peripheral surface of the soft resin pipe, and a liquid adhesive is used for this bonding. The conventional work relating to the bonding will be described. First, the hard resin ring is externally fitted and mounted at a predetermined position on the outer peripheral surface of the soft resin pipe, and then the soft resin pipe is mounted at the mounting position of the hard resin ring. A small gap is made between the outer peripheral surface of the soft resin pipe and the inner peripheral surface of the hard resin ring by pressing the peripheral wall with a finger or the like to make it dent or bend. Then, after dropping the liquid adhesive into the gap in a state where the peripheral wall of the soft resin pipe is recessed or bent, the soft resin pipe is passed through the adhesive by releasing a finger or the like. Are brought into contact with the inner peripheral surface of the hard resin ring. Then, by repeating the above-described process of creating a gap and dropping the adhesive to make contact with each other at an arbitrary interval in the circumferential direction of the hard resin ring, one hard resin ring is bonded to the soft resin pipe. If a plurality of hard resin rings are bonded to the soft resin pipe, the above operation is repeated for each hard resin ring.

However, in the production of the ring-mounted soft resin pipe, a liquid adhesive is dropped in an amount necessary and sufficient to exhibit the desired adhesive force, and the outer peripheral surface of the soft resin pipe and the inner peripheral surface of the hard resin ring There is a problem that it is very difficult to distribute the whole and uniformly between the two. That is, as described above, since the hard resin ring is fitted on the outer peripheral surface of the soft resin pipe, the liquid adhesive is uniformly applied to the entire inner peripheral surface of the hard resin ring in advance. In addition, a liquid adhesive is applied to the inner peripheral surface of the hard resin ring which is an adhesive surface within a small gap formed between the outer peripheral surface of the soft resin pipe and the inner peripheral surface of the hard resin ring. It is impossible to spread uniformly throughout.
Therefore, in the above conventional method, when the adhesive is dripped excessively and the outer peripheral surface of the soft resin pipe is brought into contact with the inner peripheral surface of the hard resin ring, the adhesive is in contact with the soft resin pipe and the soft resin pipe. The application area of the adhesive was expanded by protruding from between the hard resin rings.
However, protruding the liquid adhesive as described above causes a problem that the amount of the adhesive that is wasted increases, or the liquid adhesive that protrudes hangs down, so that the outer peripheral surface of the soft resin pipe This causes a problem of deteriorating the appearance by fouling or leaving unnecessary adhesion marks on the finger of the worker who is working.
Furthermore, the liquid adhesive spreads unevenly by protruding, and is not evenly spread over the inner peripheral surface of the hard resin ring, There has been a problem that uneven adhesion may occur.
Furthermore, the soft resin pipe is pressed with a finger to form a gap of a predetermined width, and the troublesome work of dripping the liquid adhesive into the gap must be repeated many times. Until the adhesive is cured, it is necessary to hold the soft resin pipe and the hard resin ring for a long time so that the soft resin pipe and the hard resin ring do not deviate from each other.

The present invention has an object to solve the above-described conventional problems. In the present invention, the hard resin ring is bonded to the outer periphery of the soft resin pipe with a liquid adhesive. A plurality of communication grooves parallel to the axial direction of the hard resin ring and a circumferential groove continuous in the circumferential direction are provided on the inner peripheral surface of the ring, and the inside of the communication groove communicates with the inside of the circumferential groove. There is provided a ring-mounted soft resin pipe that distributes the liquid adhesive to the inner surface of the hard resin ring through the communication groove and the circumferential groove.
The soft resin is a resin having an elastic modulus smaller than 700 kgf / cm ² measured by a tensile or bending test according to ASTM D747, 638, and 883, and the hard resin is a tensile or bending test. Is defined as a resin having an elastic modulus of 7000 kgf / cm ² or more.
The liquid adhesive is preferably a cyano adhesive.
In the present invention, as a method for manufacturing the ring-mounted soft resin pipe, when the hard resin ring is bonded to the outer periphery of the soft resin pipe with a liquid adhesive, the liquid adhesive is attached to the outer periphery of the soft resin pipe. After the hard resin ring is fitted, an expansion tube is inserted inside the soft resin pipe, and a pressure gas is injected into the expansion tube so as to expand the space between the expansion tube and the hard resin ring. A method of dripping is provided.

[Action]
In the present invention, the inner surface (adhesion surface) of the hard resin ring 1 bonded to the outer peripheral surface of the soft resin pipe 3 is parallel to the axial direction of the hard resin ring 1 (the circumferential direction of the hard resin ring 1). A plurality of communication grooves 2 and a circumferential groove 5 continuous in the circumferential direction of the hard resin ring 1 are provided. One or a plurality of such hard resin rings 1 are fitted into the outer periphery of the soft resin pipe 3 and disposed at a predetermined position, thereby forming a ring-mounted soft resin pipe 3A.
In the hard resin ring 1, when a liquid adhesive is dropped into the communication groove 2 in a state of being externally fitted to the soft resin pipe 3, the liquid adhesive passes through the inside of the communication groove 2 on the dropping side. From the end of the resin to the end opposite to the dropping, or along the circumferential groove 5 on the way, to the entire circumference of the inner circumference of the hard resin ring 1 from the dropping position (Claim 1).
Further, an expansion tube 10 is inserted inside the soft resin pipe 3, and pressure gas is injected into the expansion tube 10 to expand the expansion tube 10, so that the soft resin pipe 3 is not crushed from the inside. By adopting the supporting manufacturing method, the outer peripheral surface of the soft resin pipe 3 and the inner peripheral surface of the hard resin ring 1 are brought into close contact with each other, the bonding work is facilitated, and more reliable bonding is performed. 4).

〔effect〕
In the present invention, the liquid adhesive dropped into the communication groove 2 in a state where the hard resin ring 1 is externally fitted to the soft resin pipe 3 allows the communication groove 2 and the peripheral groove 5 to be connected. It travels uniformly over substantially the entire inner surface of the hard resin ring 1 that is an adhesive surface, or is held in the communication groove 2 and the circumferential groove 5. For this reason, since it can suppress that a liquid adhesive protrudes between the inner peripheral surface of the said hard resin ring 1 and the outer peripheral surface of the said soft resin pipe 3, the waste of this adhesive is saved and the adhesive protruded Since dripping and adhesion to the operator's finger can be suppressed, the appearance can be improved. Further, as described above, the adhesive travels substantially uniformly over the entire bonding surface through the circumferential groove 5, so that reliable bonding without unevenness in bonding can be performed. Further, when the liquid adhesive is dropped, the adhesive is simply dropped into the communication groove 2 without performing the troublesome work of forming a gap with a predetermined width by pressing with a finger as in the prior art. However, since it reaches almost the entire bonding surface, the work related to bonding can be simplified.

The front view which shows the hard resin ring of this embodiment. Sectional drawing which shows the hard resin ring of this embodiment. Schematic which expanded a part which shows the communicating groove | channel provided in the hard resin ring. (A) is explanatory drawing which shows a soft resin pipe and a hard resin ring, (b) is explanatory drawing which shows the state which fits a hard resin ring in a soft resin pipe, (c) adheres a hard resin ring to a soft resin pipe Explanatory drawing which shows a state, (d) is a perspective view which shows the ring mounting | wearing soft resin pipe of this embodiment. Explanatory drawing which shows the expansion tube in another form. Explanatory drawing which shows adhesion | attachment of the hard resin ring which uses an expansion tube.

[First Embodiment]
1st Embodiment which is one Example which actualized this invention is described using FIGS. 1-4.
The ring mounting soft resin pipe 3A of the present embodiment is mounted by fitting a hard resin ring 1 having a ring shape on the outer periphery of a cylindrical soft resin pipe 3, and further mounting the soft resin pipe 3 and the hard resin ring 1 Are bonded with a liquid adhesive (see FIG. 4D). Further, a plurality of the hard resin rings 1 are arranged on the outer peripheral surface of the soft resin pipe 3 so as to be spaced at substantially equal intervals in the axial direction of the soft resin pipe 3 (FIG. 4D). reference).
As shown in FIGS. 1 and 2, the hard resin ring 1 having a ring shape has a cross-sectional shape that is a dome shape, and an inner peripheral surface that is a cross-sectional shape and a substantially planar shape. A communication groove 2 and a peripheral groove 5 are provided on the inner peripheral surface of the hard resin ring 1.

  A plurality (16 in total in FIG. 1) of the communication grooves 2 are provided on the inner peripheral surface of the hard resin ring 1. The communication groove 2 is formed to extend in parallel to the axial direction of the hard resin ring 1 (in a direction orthogonal to the circumferential direction of the hard resin ring 1, in other words, the thickness direction of the hard resin ring). At the same time, the plurality of hard resin rings 1 are formed so as to be arranged at substantially equal intervals in the circumferential direction. Further, both end portions of the communication groove 2 are open to the outside on both surfaces in the axial direction of the hard resin ring 1. The communication groove 2 of the present embodiment has a semicircular cross section with a depth d of 0.5 mm and a bottom surface curvature radius R of 0.5 mm (see FIG. 3).

  The circumferential groove 5 is formed on the inner circumferential surface of the hard resin ring 1 at the center in the axial direction of the hard resin ring 1 and is formed continuously in the circumferential direction of the hard resin ring 1. The inside of the circumferential groove 5 communicates with the inside of the communication groove 2. Therefore, by pouring a liquid adhesive into the communication groove 2, the adhesive can be poured into the circumferential groove 5. The depth of the circumferential groove 5 of this embodiment is substantially the same as the depth d of the communication groove 2 (see FIG. 2).

The hard resin ring 1, ASTM D747, the 638, pulling by the 882 or bending the measured elastic modulus by testing, the 7000kgf / cm ² or more hard resin material, examples of the hard resin such as hard polyvinyl chloride There are vinyl, acrylonitrile-butadiene-styrene (ABS) resin, polycarbonate resin, and the like.

The production of the ring-mounted soft resin pipe 3A will be described.
As shown in FIG. 4 (a), the outer diameter of the soft resin pipe 3 is set to be substantially equal to the inner diameter of the hard resin ring, and the hard resin ring 1 is fitted into the outer periphery of the soft resin pipe 3. (See FIG. 4D).
When a plurality of hard resin rings 1 are mounted on the outer peripheral surface of the soft resin pipe 3 as shown in FIG. 4 (b) and set at a predetermined position as shown in FIG. 4 (c), the soft resin pipe 3 And the hard resin ring 1 are bonded.
The adhesion is simply performed by dropping the liquid adhesive 4 onto the end of the communication groove 2 opened on the surface of the hard resin ring 1. That is, the dropped adhesive 4 is preferably sucked into the communication groove 2 by capillary action and travels through the communication groove 2 from the end on the dropping side to the end on the opposite side of the dropping. It also enters the circumferential groove 5 communicating with the communication groove 2. For this reason, since the adhesive 4 that does not fit in the communication groove 2 enters the circumferential groove 5 and is suitably held in the communication groove 2 and the circumferential groove 5, the soft resin pipe 3 and Since the protrusion from the hard resin ring 1 is prevented, the waste of the adhesive is suppressed, and the appearance is not deteriorated by dripping or adhering to the operator's hand.
Further, the circumferential groove 5 is provided continuously in the circumferential direction of the hard resin ring 1, and the adhesive 4 that has entered the circumferential groove 5 travels through the circumferential groove 5, thereby Since it reaches the entire circumferential surface, that is, the entire bonding surface, uneven bonding is suppressed. Further, a plurality of communication grooves 2 are provided at equal intervals in the circumferential direction of the hard resin ring 1, and the adhesive 4 is adhered to the bonding surface by dropping a small amount of the adhesive 4 into each communication groove 2. As a result, the adhesive unevenness is eliminated while eliminating the waste of the adhesive.
As shown in FIG. 4D, when the adhesive 4 is cured, a ring-mounted soft resin pipe 3A whose outer periphery is reinforced by a plurality (three) of hard resin rings 1 is manufactured.
As the liquid adhesive 4 used for the production of the ring-mounted soft resin pipe 3A, a cyano adhesive having α-cyanoacrylate as a main component is generally used.

[Example of change]
The present invention is not limited to the above-described embodiment, and may be in the form shown below.
FIG. 7 shows a cylindrical expansion tube 10 made of an elastic body such as rubber. One end is opened and a plug 11 for injecting pressure gas into the expansion tube 10 is connected. The end is closed and closed. A three-way valve 15 having a pressure gas inlet 12, a pressure gas outlet 13, and a handle 14 is attached to the plug 11. Depending on the operation of the handle 14, the pressure gas inlet 12 or the pressure The gas discharge port 13 is switched to communicate with the inside of the expansion tube 10. A supply hose 16 for supplying pressure gas is connected to the pressure gas inlet 12, and a gate valve 17 is connected to the pressure gas outlet 13.
As shown in FIG. 8, the expansion tube 10 is inserted into a soft resin pipe 3 equipped with a plurality of hard resin rings 1, and the expansion tube 10 is operated from the pressure gas inlet 12 of the three-way valve 15 by operating a handle 14. A pressure gas is introduced into 10 and the expansion tube 10 is expanded to support the soft resin pipe 3 from the inside by the expansion tube 10. In this state, the adhesive 4 is dropped and the soft resin pipe 3 is dropped. And the hard resin ring 1 are bonded.
As the pressure gas, pressure air is generally used.
According to the method using the expansion tube 10, since the soft resin pipe 3 is supported by the tube from the inside during the bonding with the adhesive 4, the soft resin pipe 3 is recessed and the hard resin ring 1. It is prohibited to move away from the substrate, and adhesion workability is improved.
When the adhesion between the hard resin ring 1 and the soft resin pipe 3 is completed, the expansion valve is opened by switching the pressure gas inlet 12 to the pressure gas outlet 13 by operating the handle 14 and then opening the gate valve 17. The pressure gas in 10 is discharged, and the expansion tube 10 is taken out from the soft resin pipe 3.
The inflatable tube may have a long balloon shape without a plug.

  In the present invention, in order to reinforce the soft resin pipe 3, the work of bonding the hard resin ring 1 to the outer periphery of the soft resin pipe 3 with the liquid adhesive 4 becomes extremely easy, so that it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Hard resin ring 2 Communication groove 3 Soft resin pipe 4 Adhesive 5 Circumferential groove 10 Expansion tube

Claims (4)

A structure in which a hard resin ring is bonded to the outer periphery of a soft resin pipe with a liquid adhesive,
A plurality of communication grooves parallel to the axial direction of the hard resin ring and a circumferential groove continuous in the circumferential direction are provided on the inner peripheral surface of the hard resin ring,
The inside of the communication groove communicates with the inside of the circumferential groove,
A ring-mounted soft resin pipe, characterized in that the liquid adhesive is spread over the inner surface of the hard resin ring through the communication groove and the circumferential groove. The soft resin is a resin having a modulus of elasticity smaller than 700 kgf / cm ² measured by a tensile test according to ASTM D747, 638, and 883, or a bending test,
The ring-mounted soft resin pipe according to claim 1, wherein the hard resin is a resin having an elastic modulus measured by a tensile or bending test of 7000 kgf / cm ² or more. The ring-mounted soft resin pipe according to claim 1 or 2, wherein the liquid adhesive is a cyano adhesive. A method for producing a ring-mounted soft resin pipe according to any one of claims 1 to 3,
When bonding a hard resin ring to the outer periphery of a soft resin pipe with a liquid adhesive,
After the hard resin ring is fitted on the outer periphery of the soft resin pipe, the liquid adhesive is expanded by inserting an expansion tube inside the soft resin pipe and injecting a pressure gas into the expansion tube. The ring-mounted soft resin pipe manufacturing method, wherein the ring-mounted soft resin pipe is dropped between the expansion tube and the hard resin ring.

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