JPH11336983A - Fusing method for quick close type electric fused joint and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fusing method for a quick close electric fused joint and a device therefor capable of fusing by one time carrying of a current without complicating manufacture of the quick close electric fused joint. SOLUTION: In this fusing method, in the case of fusing a resin pipe connected by using a quick stop electric fused joint connecting an electric fused joint 2 to at least two or more connection ports of a resin joint main unit 1, terminal pins 3 of each electric fused joint 2 are connected by a conductive wire 4 in an execution site, a heating wire of each electric fused joint 2 is electrically connected in series, a current is carried from the terminal pin 3 without connecting the conductive wire 4, and after carrying of the current, the conductive wire 4 is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric fusion joint for connecting resin pipes made of a thermoplastic resin such as polyethylene or polybutene. The present invention relates to a method and an apparatus for fusing a joined type B electric fusion joint.

[0002]

2. Description of the Related Art In an electric fusion joint, an outer surface of a resin tube to be connected is brought close to an inner surface of the electric fusion joint, and a heating wire provided near the inner surface of the electric fusion joint is supplied with electric current from a terminal pin through an electric fusion joint. This is a joint for connecting resin pipes by fusing and joining a fitting joint and a resin pipe, and there are various types such as a socket type, an elbow type, a cheese type, and a cap type.

[0003] Among the electrofusion joints of this type, a small-diameter joint is obtained by winding a bare heating wire around an inner formed in advance by injection molding or by heating a heating wire coated with a resin on a metal core for injection molding. After being wound, it is integrally molded by injection molding, and is called an instep type electrofusion joint.

[0004] On the other hand, when the nominal diameter becomes large, the development cost of a mold and the like increases drastically. Therefore, a socket type joint, which is expected to have a large demand, is manufactured in the same manner as the former type electro-fusion joint. Although manufactured, such as elbow-type or cheese-type joints, which are less in demand, as disclosed in Japanese Patent Application Laid-Open No. 5-256391, a simple joint-like electric socket-like shape is provided at the connection port of the resin joint main body. It is manufactured by post-attaching a fusion joint by butt fusion or the like, and is called a second type electric fusion joint.

[0005] Normally, in this type B electric fusion joint, unlike the former type electric fusion joint in which the resin pipe can be fused and joined by one energization, each joint joined to the connection port of the resin joint main body. It is necessary to energize each electric fusion joint.
No. 6392 discloses that the terminal pins of the respective electric fusion joints are connected by a conductive wire, the electric heating wires of the respective electric fusion joints are electrically connected in series, and the resin tube is fused and joined by one energization. Possible type B electrofusion joints have been proposed.

[0006]

However, in the type B electro-fusion joint described in Japanese Patent Application Laid-Open No. 5-256392, it is necessary to provide a conductive wire for each joint. It becomes complicated and costly.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and can provide a resin tube which can be fused and joined by a single energization without complicating the production of a type B electric fusion joint. It is an object of the present invention to provide a method and an apparatus for fusing a type electric fusion joint.

[0008]

SUMMARY OF THE INVENTION The above object is achieved by fusing and joining a resin pipe using a second type electric fusion joint in which an electric fusion joint is joined to at least two or more connection ports of a resin joint body. At the time of construction, at the construction site, the terminal pins of each of the electric fusion joints are connected by a conductive wire, and the heating wires of each of the electric fusion joints are electrically connected in series. The problem can be solved by a method of welding a second type electric fusion joint in which electricity is supplied and the conductive wire is removed after the electricity is supplied.

[0009] At the construction site, at least two
Connect the terminal pins of each type of electrofusion joint with a conductive wire and electrically connect the heating wire of each electrofusion joint in series. If the electric wires are connected and the electric current is applied from the terminal pins to which the conductive wires are not connected, the electric heating wires of the respective electric fusion joints can be energized, so that the resin tube can be fused and joined by a single energization. In addition, if the conductive wire is removed after energization, this conductive wire can be reused for the next B-type electro-fusion joint, so there is no need to provide a conductive wire for each B-type electro-fusion joint, which complicates the production. Never.

[0010] If the conductive wire is facilitated for each application, and if the conductive wire is attached or detached, the conductive wire may be damaged or lost, but a plurality of electrically conductive terminals electrically connected in series are provided. Such a situation can be prevented by using a welding current-carrying device having the following.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a method for fusing a type B electric fusion joint according to the present invention.

This B type electrofusion joint is a joint in which a socket type electrofusion joint 2 provided with a pair of terminal pins 3 at connection ports of both sleeves of an elbow type resin joint body 1 is butt-fused. .

When joining a resin tube (not shown) to each socket-type electrofusion joint 2, one of a pair of terminal pins 3 of each socket-type electrofusion joint 2 is connected by a coated conductive wire 4 before energization. Connect each socket type electric fusion joint 2
Are electrically coupled in series and energized from the unconnected terminal pin 3 of the other coated conductive wire 4,
The resin tube can be fused and joined to the connection port of both sleeves of the B type electric fusion joint by one energization.

Further, if the covered conductive wire 4 is removed after energization, the covered conductive wire 4 can be reused. FIG. 2 shows another embodiment of the method for fusing a type B electric fusion joint according to the present invention.

This B type electrofusion joint is a joint in which a socket type electrofusion joint 2 provided with a pair of terminal pins 3 at three connection ports of a cheese type resin joint body 1 is butt-fused. .

When joining a resin tube (not shown) to each socket-type electrofusion joint 2, one of a pair of terminal pins 3 of each socket-type electrofusion joint 2 is connected by a coated conductive wire 4 before energization. Connect each socket type electric fusion joint 2
Are electrically coupled in series and energized from the unconnected terminal pin 3 of the other coated conductive wire 4,
A resin tube can be fused and joined to the three connection ports of the B type electric fusion joint by one energization.

FIG. 3 shows an embodiment of a method for fusing a second type electric fusion joint using a fusion apparatus according to the present invention.

Using the welding energizing device 6 having a plurality of energizing terminals 5 electrically connected in series according to the present invention, these energizing terminals 5 are provided at the connection port of the cheese-type resin joint body 1. When the heating wires of the respective socket-type electrofusion joints 2 are electrically connected in series by connecting to the terminal pins 3 of the respective socket-type electrofusion joints 2 and energized, a single operation similar to FIG. The resin tube can be fused and joined by energization.

Further, since the current-carrying terminal 5 instead of the conductive wire is fixed to the welding current-carrying device 6, the problem of breakage or loss of the conductive wire does not occur.

[0020]

As described above, the present invention is constructed as described above, so that it is possible to fuse and join the resin pipe with a single energization without complicating the production of the type B electric fusion joint. A method and an apparatus for fusing an electric fusion joint can be provided.

[Brief description of the drawings]

FIG. 1 shows a method 1 for fusing a type B electrofusion joint according to the present invention.
It is a figure showing an embodiment.

FIG. 2 is a view showing another embodiment of the method for fusing a second type electric fusion joint according to the present invention.

FIG. 3 is a view showing one embodiment of a method for fusing a type-B electric fusion joint using a fusion device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin joint main body 2 Socket type electric fusion joint 3 Terminal pin 4 Insulated conductive wire 5 Electricity terminal 6 Electricity welding device

Claims (2)

[Claims] When a resin pipe is fused and joined using a second type electric fusion joint in which an electric fusion joint is joined to at least two or more connection ports of a resin joint main body, each of the electric pipes is connected at a construction site. The terminal pins of the fusion joint are connected by a conductive wire to electrically connect the heating wires of the respective electric fusion joints in series, and electricity is supplied from a terminal pin that is not connected to the conductive wire,
A method of fusing a second type electric fusion joint for removing the conductive wire after energization. 2. A welding current applying apparatus having a plurality of electrically connected terminals electrically connected in series.