JPH0441225A - Electrofusion fittings and electrofusion equipment - Google Patents

Abstract

PURPOSE:To obtain an electric welding joint having a simple structure and easy in execution by forming the acting part acting on a plurality of the switch elements provided to a connector to a socket and providing the positioning means of the connector and the socket. CONSTITUTION:When the upper part of the fixing member 48 of a connector 28 is pressed, the lower end part thereof is opened outwardly and the fixing member 48 is slid downwardly along a notch 22 to insert the terminal cover 88 of the connector 28 in the hollow part of a socket 16 and a terminal 26 is inserted in the recessed part 106 of a terminal 102. An engaging piece 52 is engaged with the under surface of the flange part 20 of the socket 16 to fix the connector 28 and the projection 24 of the socket 16 presses a piezoelectric switch 78. The signal from the piezoelectric switch 78 is inputted to a microcomputer through an electric wire 74. The microcomputer determines the current supply time of a current on the basis of the signal from the connector 28 to transmit a signal to a power supply. A current is supplied to an electric heating line 14 from the power supply for the desired time corresponding to the kind of an electric welding joint 10 through the connector 28 and the terminal 26.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an electrofusion joint and a method for recognizing the same, and particularly relates to an electrofusion joint used for electrofusion of gas polyethylene pipes, polybutene pipes, polypropylene pipes, etc. [Prior art] Regarding a joint and its recognition method [Prior art] As a prior art of this type, first, there is Japanese Patent Publication No. 1-40743, which was published on August 31, 1999.

This technology incorporates a resistor with a predetermined resistance value into the wall of the sleeve, detects the resistance value, recognizes the sleeve, and sets the energization time according to the sleeve.

Further, as another prior art, there is Japanese Patent Publication No. 63-43219, which was published on August 29, 1988. This technique involves mounting an outer tubular member equipped with a variable resistance device around an inner cylindrical member mounted on the finting.

Then, by operating the variable resistance device by selective relative rotation of both members and selecting a specific resistance value,
This determines the energization time required for electric fusion of finning.

Furthermore, as another prior art, there is Utility Model Application Publication No. 1-92593 published on June 16, 1999.

This technology creates a socket inside the socket formed on the outside surface of the pipe joint.
A projection having a height corresponding to the diameter size of the pipe joint is provided, and the diameter size of the pipe joint is identified by bringing the projection into contact with a predetermined microswitch.

[Problem to be solved by the invention]

In the above-mentioned prior art, in Japanese Patent Publication No. 1-40743, it was necessary to embed a resistor in the sleeve. Furthermore, in Japanese Patent Publication No. 63-43219, it is not necessary to incorporate a resistor into the fitting, but an outer tubular member equipped with a variable resistance device and an inner cylindrical member are required, and both members are positioned at the pipe joint terminal. Moreover, in Utility Model Application Publication No. 1-92593, a microswitch is required. As described above, these conventional techniques have complicated structures, making manufacturing and construction complicated.

Therefore, the main object of the present invention is to provide an electrofusion joint that has a simple structure and is easy to manufacture and install, and a method for recognizing the same.

[Means to solve the problem]

The first invention is an electric fusion joint that includes a main body having a built-in heating element, a terminal connected to the heating element and provided on the outer surface of the main body, a socket provided in association with the terminal, and a connector connected to the socket. forming an acting part in the socket that acts on a plurality of switch elements provided in the connector;
The electrical fusion joint also includes positioning means for relative positioning of the socket and the connector.

A second invention recognizes a joint by a combination of signals from a plurality of switch elements of the electrical fusion joint of the first invention.
This is a method of recognizing electric fusion joints.

[Effect]

A connector provided with a plurality of switch elements is connected to the socket of the main body. At this time, the socket is provided with a predetermined number of acting portions at predetermined locations determined by the type of the joint, and the acting portions act on a plurality of switch elements of the connector. A signal is uniquely determined depending on which switch element is activated, and the type of joint is recognized by the combination of the signals, and the energization time is set according to the joint as necessary.

〔Effect of the invention〕

According to this invention, construction can be easily performed by simply joining a socket and a connector, and each joint can be recognized and an appropriate energization time can be easily set. Various types of joints can be easily recognized simply by changing the location and/or combination of the number of action parts.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

〔Example〕

Referring to FIG. 1, an electric fusion joint 10 of this embodiment includes a hollow cylindrical main body 12, and a heating wire 14 serving as a heating element is embedded in a spiral shape near the inner surface of the main body 12. .

A socket 16 is formed near both ends of the outer surface of the main body 12 . The socket 16 includes a hollow cylindrical portion 18, as best seen in FIGS. 2, 3A, and 3B.
A flange portion 20 that projects outward is formed at the upper end of the hollow cylindrical portion 18 . A fixing member 48 (
Two notches 22 are formed to fit into the fixing member 48 (described later), and the upper part of the notch 22 is formed to be inclined so that the fixing member 48 can be easily fitted. The notch 22 is formed at the protrusion 24
and a piezoelectric switch 78 (both described below) are determined to be located correspondingly. Furthermore, a protrusion 24 serving as an action part is formed on the upper surface of the collar part 20. The location and number of the protrusions 24 are determined by the type of the main body 12, and in this embodiment only one protrusion is formed near the notch 22. Further, terminals 26 are connected to both ends of the heating wire 14, and the terminals 26 are arranged so that their tips are exposed in the hollow portion of the socket 16.

The socket 16 formed in this way has a connector 28
is connected. As best seen in FIGS. 2, 4, and 5, the connector 28 includes a connector body 30, and the connector body 30 includes a body 32. The body 32 has a hollow portion 34 and an upper end thereof. and 36 steps at the bottom edge, respectively.
and 38 are formed. Three screw holes 40 are formed at equal intervals on the upper surface of the step 38. Further, an enlarged diameter part 42 is formed at the lower part of the body part 32, and as can be clearly seen from FIG. A groove 46 is formed between the two support parts 440. Then, the fixing member 48 is fitted into the groove 46 between the two support parts 44 and fixed to the support part 44 with the screw 50. Further, the fixing member 48 has a lower end portion that is connected to the collar portion 22 of the socket 16.
A slightly upper inner surface of the fixing member 48 is fixed to the body portion 32 by a spring member 54. The fixing member 48 is supported so as to be openable and closable using the position fixed by the screw 50 as a fulcrum, and is restored to a predetermined position by the elastic force of the spring member 54.

Further, a screw 56 is formed at the upper end of the outer surface of the body portion 32, and a connector wire cover 58 also shown in FIG. 6 is screwed into this screw 56. That is, the connector wire cover 58
has a through hole 60 in its center, and steps 62, 64 and 66 are formed on the lower surface of the connector wire cover 58. Further, a screw 68 is formed on the side surface of the step 66. Then, by screwing the thread e68 onto the screw 56,
A connector wire cover 58 is attached to the body portion 32.

Further, a rubber sleeve 702 having a hollow portion between the steps 36 and 64 is provided with a half-shaped fixing ring 72 for fixing electric wires as shown in FIG. 7 in each step 62. Then, the electric wire 74 is inserted through the through hole 60 of the connector TJI wire cover 58 and into the hollow portion 34 of the body portion 32 .

A disk member 7 having a hollow portion is disposed in the step 38 of the connector main body 30 formed in this way.
Three sheet-shaped piezoelectric switches 78 are formed at equal intervals on the lower surface of the piezoelectric device 6, and these piezoelectric switches 78 are connected to the electric wire 74. Three threaded holes 80 communicating with the screw holes 40 are formed at equal intervals between the respective piezoelectric switches 78. Further, a hollow disk-shaped rubber seal 82 is disposed on the lower surface of the disk member 76. A hole 84 corresponding to the piezoelectric switch 78 and a screw hole 86 communicating with the screw hole 80 are formed in the rubber seal 82 .

A terminal cover 88 made of resin, for example, is fitted into the step 38. The terminal cover 88 includes a cylindrical portion 90 having a hollow portion, and a disk-shaped flange portion 92 is formed on the upper outer peripheral surface of the cylindrical portion 90 . Further, holes 94 and 96 are formed in the center of the lower surface and the center of the upper surface of the cylindrical portion 90, respectively. A hole 84 is provided in the flange portion 92.
three holes 98 communicating with the screw hole 86 and three holes 98 communicating with the screw hole 86
Two screw holes 100 are formed. A terminal 102 made of, for example, brass or nickel plating is built into the hollow portion of the terminal cover 88. The terminal 102 includes a cylindrical terminal body 104, a recess 106 communicating with the hole 94 is formed in the center of the lower surface of the terminal body 104, and a protrusion connected to the electric wire 74 is formed in the center of the upper surface of the terminal body 104. A portion 108 is formed. In this terminal 102, the protrusion 108 is connected to the hole 9.
A rubber seal 110 in the shape of a hollow disk is inserted between the upper surface of the terminal body 104 and the upper surface of the hollow portion of the terminal cover 88.

Then, position each member so that the screw holes 40, 80, 86, and 100 communicate with each other, and
By screwing them together, the terminal cover 88 is attached to the connector body 30 with the disc member 76 and the rubber seal 82 sandwiched therebetween. Note that at this time, the hole 84
and 98 are positioned so as to communicate with the piezoelectric switch 78, and the protrusion 108 of the terminal 102
Connected to 4.

The connector 28 thus formed is connected to the socket 16 as shown in FIG. That is, by pressing the upper parts of the two fixing members 48 of the connector 28, the lower ends of the pressing members 48 open outward, and in this state, the fixing members 48 are slid below the notch 22, and the socket 16 is opened.
The terminal cover 88 of the connector 28 is inserted into the hollow part of the terminal 102, and the terminal 26 is inserted into the recess 106 of the terminal 102 for connection. Then, when the pressure on the upper part of the fixing member 48 is released, the elastic force of the spring member 54 causes the fixing member 48 to
is restored to its original state, and the locking piece 52 is attached to the socket 1.
6, the connector 28 is fixed. At this time, the protrusion 24 of the socket 16 passes through the holes 84 and 98 and presses the piezoelectric switch 78. Then, as shown in FIG. 9, a signal from the pressed piezoelectric switch 78 passes through the electric wire 74 to the microcomputer 11
4 is input. And the microcomputer 114
Then, the current application time is determined based on the input signal from the connector 28, and the signal is transmitted to the power source 116. Accordingly, from power supply 116, connector 28. A current is supplied to the heating wire 14 through the terminal 26 for a desired time depending on the main body 12, that is, the 100 types of electric fusion joints.

According to this embodiment, there is no need to embed a resistor in the main body 12, so that costs can be reduced. In addition, since it can be set simply by connecting the connector 28 to the socket 16, workability is also improved.

In this embodiment, since three piezoelectric switches 78 are formed on the lower surface of the disc member 76, 23=8 combinations are possible, and therefore eight types of electric fusion joints 10 can be distinguished. can do. Further, the number of piezoelectric switches 78 may be arbitrary; for example, if four piezoelectric switches 78 are formed, 2' = 16 combinations are possible, and if n pieces are formed, 2'' combinations are possible. Easy to identify.

Further, in the above embodiment, the piezoelectric switch 78 was used as the switch element, but a pressure switch such as a touch switch, a strain gauge switch, or a conductive rubber pressure switch may also be used. Furthermore, a Hall sensor that embeds a magnetic material such as a magnet in the end face of the socket 16 and detects the magnetic field, or a magnetic sensor that uses a magnetoresistive element whose resistance value changes depending on the magnetic field may be used. 1
A reflective photosensor may also be used in which a silver tape is attached to the end face of 6 or a piece of metal such as aluminum is embedded to serve as a light-emitting element, and the reflected light is detected by a light-receiving element.

[Brief explanation of the drawing]

FIG. 1 is an illustrative diagram showing an embodiment of this invention. FIG. 2 is an exploded perspective view showing the socket and connector. 3A and 3B are illustrative views showing the socket, with FIG. 3A being a plan view and FIG. 3B being a front sectional view. FIG. 4 is a sectional view showing the connector. FIG. 5 is an exploded perspective view showing the connector. FIGS. 6A and 6B are illustrative views showing the connector wire cover, with FIG. 6A being a half sectional view and FIG. 6B being a bottom view. FIG. 7 is an illustrative view showing the fixing ring. FIG. 8 is a sectional view showing a state in which the connector is connected to the socket. FIG. 9 is a block diagram showing the operating path when the connector is connected to the socket. In the figure, 10 is an electric fusion joint, 12 is a main body 14 is a heating wire, 16 is a socket, 24 is a protrusion, 28 is a connector,
74 is an electric wire, 78 is a piezoelectric switch, 114 is a microcomputer, and 116 is a power source. Utility Model Registration Applicant Kubota Co., Ltd. Agent Patent Attorney Yama

Claims (1)

[Claims] 1. A main body with a built-in heating element, a terminal connected to the heating element and provided on the outer surface of the main body, a socket provided in association with the terminal, and a connector connected to the socket. An electrical fusion joint, the electrical fusion joint comprising: an operating part that acts on a plurality of switch elements provided on the connector; and a positioning means for relative positioning of the socket and the connector. Fusion joint. 2. Recognizing a joint by a combination of signals from the plurality of switch elements of the electrical fusion joint according to claim 1;
How to recognize electrofusion joints.