JPH091670A - Control device for electric fusion joint - Google Patents

Abstract

PURPOSE: To provide the title control device preventing the generation of the discrimination mistake of a fusing time and capable of monitoring the kind of a joint set for the discrimination of the fusing time. CONSTITUTION: In a control device for an electric fusing joint wherein a fusion controller 20 is equipped with a joint fusing time discrimination adaptor 30, the adaptor 30 is equipped with a variable resistor 34 capable of being altered in its resistance value corresponding to the kind of a joint by the operation applied to a keyboard 32 and a monitor 33 monitoring and displaying the kind of the joint selected by the operation applied to the keyboard 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an electric fusion joint.

[0002]

2. Description of the Related Art Conventionally, there is an electric fusion joint as described in Japanese Patent Publication No. 1-40743. This electric fusion joint has a resin layer on the surface of the fitting portion of the pipe joint and a heating wire embedded in the resin layer when the pipe to be connected is fitted and connected to the fitting portion of the pipe joint. , The surface of the pipe to be connected is also a resin layer, and while the surface resin layer of the pipe to be connected is fitted to the surface resin layer of the fitting part of the pipe joint, the heating wire is energized to generate heat, The resin layer and the resin layer of the pipe to be connected are fused together.

In the prior art, the pair of power supply terminals connected to the fusion controller are connected to the electrode fittings provided at both ends of the heating wire to energize the heating element. I am trying to do it.

Further, in the prior art, a joint fusion time identifying resistor is built in the above-mentioned electrode fitting provided on the joint body side, and this electrode fitting is screwed to the joint body at the construction site for use. I am trying. However, in the prior art,
Since different identification resistors are used for each fusion-bonding time of the joint, and different identification resistors must be attached to each joint type, the cost for each joint becomes high.

Therefore, in order to reduce the cost of the joint, there has been conventionally provided a fusion controller with a joint fusion time identification adapter as described in JP-A-7-9569. In this adapter, the fusing time identifying resistor is composed of a variable resistor, and its resistance value is changed according to the joint type by operating the adjusting dial. According to this, it is not necessary to use a different identification resistor for each joint type, and the cost for each joint can be reduced.

[0006]

However, Japanese Patent Laid-Open No. 7-
In the conventional technique described in Japanese Patent Publication No. 9569, the resistance value of the fusion resistance identifying variable resistor is changed by a dial.
For this reason, a slight deviation in the rotational operation angle of the dial may cause an erroneous fusion time identification. Also, the setting of the joint type set by dial operation cannot be confirmed.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the occurrence of a fusion time identification error and to monitor the joint type set for the fusion time identification in the control device for the electric fusion joint. .

[0008]

According to the present invention, a heating wire is built in a joint body, electrode fittings are provided at both ends of the heating wire, and each of a pair of power supply terminals connected to a fusion controller is connected to the electrode. In an electric fusion joint capable of heating a heating wire by connecting to a metal fitting, the fusion controller is equipped with a joint fusion time identification means, and the joint fusion time identification means is a keyboard. It is equipped with a variable resistor whose resistance value can be changed according to the joint type by adding operation, and a monitor for displaying the joint type selected by the operation of adding to the keyboard. It is possible to control the fusion time of the joint by reading the resistance value of.

[0009]

The resistance value of the variable resistor for identifying the fusion time is changed with the keyboard. For this reason, it does not occur that the fusion time is erroneously identified due to a slight deviation of the dial operation angle that may occur when the adjustment dial is used.

A monitor for displaying the joint type selected by operating the keyboard is provided. Therefore, the joint type set by the keyboard operation can be monitored, and the correct fusion work suitable for the joint type can be performed.

[0011]

FIG. 1 is a schematic view showing an embodiment of the present invention, and FIG.
[Fig. 3] is a schematic view showing an electric fusion joint.

As shown in FIG. 2, the electrofusion joint 10 includes the surface of the fitting portion of the joint body 11 when fitting and connecting the connected pipes 1, 1 to the fitting portion of the joint body 11. The whole is made of a resin layer of polyethylene or the like, the heating wire 12 is built in this resin layer, and the whole including the surfaces of the connected pipes 1, 1 is also made of a resin layer of polyethylene or the like. Then, the electric fusion-bonded joint 10 has the heating wire 12 in a state in which the surface resin layer of the connected pipes 1 and 1 is fitted to the surface resin layer of the fitting portion of the joint body 11.
The resin layer of the fitting portion of the joint body 11 and the resin layers of the pipes 1 and 1 to be connected are fused to each other.

At this time, in the electric fusion joint 10, as shown in FIG. 4, each of the pair of power supply terminals 21A and 21B connected to the fusion controller 20 is connected to the joint main body 11
The heating wire 12 is energized by being connected to the electrode fittings 13, 13 which are insert-molded into and are connected to both ends of the heating wire 12.

Further, as shown in FIG. 1, a fusion controller 20 is additionally provided with a joint fusion time control adapter 30. The adapter 30 has a control unit 31 (microcomputer), a keyboard 32, a monitor 33, and a variable resistor 34.
The control unit 31 can change the resistance value RA of the variable resistor 34 according to the joint type selected by the operation of adding to the keyboard 32, and displays the joint type selected by the operation of adding on the keyboard 32 on the monitor 33. To do. Then, the fusion controller 20 uses the variable resistor 3
Read the resistance value RA of No. 4 to determine the joint fusion time (energization time)
Control.

Therefore, the fusion work of the electric fusion joint 10 is performed as follows. (1) The power supply terminals 21A and 21B of the fusion controller 20 are connected to the electrode fittings 13 and 13 of the electric fusion joint 10.

(2) After confirming the type of the electric fusion splicing joint 10, the operator inputs the type code and the like to the keyboard 32. For example, for a joint with a saddle diameter of 200 φ, see “S20
The product code is "0".

(3) The control unit 31 displays the joint type of (2) above on the monitor 33. When the operator confirms the input error of the keyboard 32 by this monitor display,
The keyboard 32 is re-input.

(4) The control unit 31 sets the resistance value RA of the variable resistor 34 according to the joint type of (2) above, and the resistance value R
A signal corresponding to A is sent to the fusion controller 20. The fusion controller 20 energizes the heating wire 12 for the joint fusion time (current conduction time) according to the resistance value RA, and fuses the joint body 11 and the non-connection pipe 1.

The operation of this embodiment will be described below. The keyboard 32 is used to change the resistance value RA of the fusion resistance identifying variable resistor 34. For this reason, it does not occur that the fusion time is erroneously identified due to a slight deviation of the dial operation angle that may occur when the adjustment dial is used.

A monitor 33 for displaying the joint type selected by operating the keyboard is provided. Therefore, the joint type set by the keyboard operation can be monitored, and the correct fusion work suitable for the joint type can be performed.

In the practice of the present invention, the joint fusion time identifying means may be built in the fusion controller, or may be one that can be electrically disconnected / connected to the fusion controller.

[0022]

As described above, according to the present invention, in the controller for electric fusion splicing, it is possible to prevent the occurrence of a fusion splicing time identification error and to monitor the joint type set for the fusion splicing time identification. It can be possible.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention.

FIG. 2 is a schematic diagram showing an electric fusion joint.

[Explanation of symbols]

 10 Electric Fusion Joint 11 Joint Main Body 12 Heating Wire 13 Electrode Metal Fitting 20 Fusion Controller 21A, 21B Power Supply Terminal 30 Joint Fusion Time Identification Adapter 31 Controller 32 Keyboard 33 Monitor 34 Variable Resistance

Claims (1)

[Claims] 1. An electric heating wire is built in a joint body, electrode fittings are provided at both ends of the heating wire, and a pair of power supply terminals connected to a fusion controller are connected to the electrode fittings, respectively. In an electric fusion joint capable of generating heat rays, the fusion controller is equipped with a joint fusion time identification means, and the joint fusion time identification means is added to a keyboard according to the joint type. It is equipped with a variable resistor whose resistance value can be changed, and a monitor that displays the joint type selected by the operation of adding to the keyboard.The fusion controller reads the resistance value of the variable resistor and joint fusion A control device for an electric fusion joint, which is capable of controlling a welding time.