JP3067221U - Power supply voltage drop forecasting device for controller for electrofusion joint - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The present invention relates to a power supply voltage drop forecasting device for an electrofusion joint controller, when the power supply voltage has begun to slightly deviate from an appropriate range, that is, when there is room for taking measures to avoid an abnormal situation. It is an object of the present invention to realize a power supply voltage drop forecasting device for an electrofusion joint controller that can generate an alarm sound. A power supply voltage drop forecasting device for an electrofusion joint controller, comprising: a power supply voltage measurement unit; a CPU connected to the power supply voltage measurement unit via an A / D conversion unit; It comprises a system control memory unit 23 and an alarm output means 25 connected to the controller, and when the power supply voltage is reduced due to a self-voltage drop or the operation of another electric device during power-on preparation or power-on for the controller, An alarm is issued when there is room to take measures to avoid abnormal situations.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a power supply voltage drop prediction device for a controller for an electrofusion joint. For details, in a controller used for connecting an electrofusion joint that connects a gas pipe made of plastic pipes by an electrofusion method, an alarm is issued when the power supply voltage drops below a normal value by a predetermined value. The present invention relates to a power supply voltage drop prediction device.

[0002]

[Prior art]

 Conventionally, in plumbing work with plastic pipes such as water and sewage and gas pipes, plastic T-joints, elbow joints, socket joints, saddle joints, etc. are used, and the inner surface and the outer surface of the plastic tube are heated and melted by a heater. In this state, a plastic pipe was inserted into the joint and connected. However, recently, in order to improve workability and connection quality, an electrofusion method (hereinafter, referred to as an EF method) has been adopted.

A method of connecting a plastic pipe by the EF method will be described with reference to FIG. In the figure, reference numerals 1 and 1 'denote two plastic tubes to be connected, and 2 denotes an electrofusion joint (hereinafter referred to as an EF joint). The EF joint is a plastic tube in which a coil-shaped heating wire 3 is embedded in advance. One end of the heating wire 3 is connected to a terminal pin 4 and the other end is used to identify the type of the joint. It is connected to terminal pin 5 having an identification resistor.

Then, the plastic pipes 1, 1 ′ to be connected from both ends of the EF joint 2 are inserted until they abut against the stopper 2 a, and the connector cables 7, 7 ′ from the controller 6 are connected to the terminal pins 4, 5. I do. As shown in FIG. 3, the controller 6 has two connector cables 7, 7 'having a connector 8 and a power cable 9. An operation panel 11 is provided on the upper surface of the controller 6, and The panel 11 is provided with a power switch 12, a start switch 13, a reset switch 14, a temperature sensor 15, a fusion time display section 16, an abnormality display section 17, and the like.

When the power cable 9 is connected to the power source and the power is turned on, the controller 6 reads the identification resistance of the terminal pin 5, identifies the type of the EF joint, and identifies the EF joint based on the outside air temperature detected by the temperature sensor 15. The current application time suitable for the type is set and displayed on the fusion time display section 16. At this time, if there is an abnormality such as an input voltage abnormality, an output voltage abnormality, a fusion abnormality, a disconnection, a disconnection of a connector, etc., the abnormality is displayed on the abnormality display section 17. If there is no abnormality, a predetermined current is supplied to the EF joint 2 for a predetermined time. As a result, the heating wire 3 generates heat and melts the inner surface of the EF joint 2 and the outer surface of the plastic pipes 1 and 1 'to join them together.

[0006]

[Problems to be solved by the invention]

 Some of the conventional controllers for EF joints described above detect a drop in the power supply voltage and output an alarm. However, since they issue a warning when the normal welding current cannot be maintained and stop the welding current at the same time, the welding operator cannot take preventive measures in advance, and the Had to be discarded as an abnormally fused product.

In view of the above-mentioned conventional problems, the present invention generates an alarm sound in a controller for an EF joint when the power supply voltage slightly starts to deviate from an appropriate range, that is, when there is room for taking measures to avoid an abnormal situation. It is an object of the present invention to realize an apparatus for predicting a power supply voltage drop of a controller for an electrofusion joint, which can perform the operation.

[0008]

[Means for Solving the Problems]

 In the power supply voltage drop forecasting device for an electrofusion joint controller according to claim 1 of the present invention, a power supply voltage measurement unit, a CPU connected to the power supply voltage measurement unit via an A / D conversion unit, It is provided with a system control memory unit and alarm output means connected to the controller.If the power supply voltage drops due to self-voltage drop or the operation of other electric equipment while the controller is being prepared or energized, an abnormal situation will occur. It is characterized by issuing an alarm when there is room to take evacuation measures. A second aspect of the present invention is characterized in that a sounding body is used for the alarm output means, and generates a sound that can be distinguished from other alarm sounds that are output in the event of an abnormal fusion or the like.

With this configuration, even if there is an abnormality in the power supply voltage, an alarm is issued when the operator has time to take measures to avoid an abnormal situation, so that the operator has a means to avoid the abnormal situation. This can prevent the occurrence of abnormally fused products.

[0010]

[Embodiment of the invention]

 FIG. 1 is a block diagram showing an embodiment of a power supply voltage drop forecasting device for an EF joint controller according to the present invention. Since the present embodiment is provided in the controller for the EF joint described with reference to FIG. 3, the description of the controller for the EF joint is omitted, and the power supply voltage drop prediction device will be described. As shown in the block diagram of FIG. 1, a power supply voltage drop forecasting device according to the present embodiment includes a power supply voltage measurement unit 20, an A / D (analog to digital) conversion unit 21, a CPU (control arithmetic unit) 22, and a system control unit. It has a memory unit 23, and further has an indicator light 24, a buzzer 25, and a liquid crystal display 26 as alarm output means.

The power supply voltage measurement unit 20 is connected to a CPU 22 via an A / D conversion unit 21. The CPU 22 includes a system control memory unit 23, an indicator 24, a buzzer 25, and a liquid crystal display 26. It is connected. The system control memory unit 23 stores software related to EF controller control and the state of a large number of variables necessary for controlling the system. The control software and parameters related to “power supply voltage drop forecast” are also stored here.

The operation of the present embodiment configured as described above will be described below. First, in preparation for energization, when a power supply from a commercial power supply or a generator is connected to the controller for the EF joint, the power supply voltage measuring unit 20 measures the voltage of the power supply as an analog quantity, and converts this to a digital value by the A / D conversion unit 21. Convert and send to CPU22.

The CPU 22 compares the digital voltage value sent from the A / D conversion unit 21 with a determination reference value according to the description of the system control memory unit 23, and predicts a voltage drop, that is, a state in which power is supplied. If the power supply voltage may deviate from the normal range due to the self-voltage drop caused by the above, the indicator lamp 24 is turned on or blinks to give the worker attention. This allows the operator to raise the voltage to a normal value by using a transformer in the case of a commercial power supply, or to increase the rotation speed to a normal value in the case of a power supply, or to adjust the voltage of other electrical equipment. By limiting the use, abnormal situations can be avoided and the power supply voltage can be returned to a normal value.

Next, when the controller for the EF joint is energized and the controller is performing the fusion work of the EF joint, the CPU 22 converts the digital voltage value sent from the A / D converter 21 into a system control signal. When the power supply voltage is lower than the normal value (usually 100 V) and lower than the determination reference value for some reason according to the description in the memory unit 23, the voltage is displayed by the liquid crystal display 26. The fact that the value is equal to or less than the judgment reference value is displayed, and a warning is output by the buzzer 25 to alert the worker.

[0015] With this, the operator can raise the voltage to a normal value by a transformer in the case of a commercial power supply, adjust the voltage to a normal value by increasing the rotation speed in the case of a generator, or use another power supply. An abnormal situation can be avoided by restricting the use of gas appliances. It is preferable that the determination reference value be higher than a voltage at which normal fusion cannot be performed, for example, about 85% of a normal value so as to have a time for taking measures to avoid an abnormal situation.

Further, when the buzzer 25 is sounded, a distinction is made between a voltage drop warning sound and a sound indicating another state. For example, when an abnormality occurs in the fusion state, continuous sound and fusion are normal. When the power supply voltage is in the warning state, the short beep is interrupted several times.

As a sounding example of the voltage drop forecast sound, (sounding example 1), when entering a state in which a power supply voltage drop is to be reported, the sound is generated at a constant cycle and rhythm. (Sounding example 2) As the power supply voltage decreases, the interval between short tones is gradually shortened, and a continuous alarm is sounded when the power is outside the normal range. (Sound generation example 3) As the power supply voltage drops, the sound frequency is gradually increased. And so on.

[0018]

[Effect of the invention]

 According to the power supply voltage drop forecasting device of the electrofusion joint controller of the present invention, an alarm sound should be generated when the power supply voltage starts to deviate slightly from the appropriate range, that is, when there is room to take measures to avoid abnormal situations. As a result, the operator can take measures to avoid an abnormal situation, and can prevent defective fusion beforehand.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a power supply voltage drop prediction device of an electrofusion joint controller according to the present invention.

FIG. 2 is a view for explaining a method of connecting a plastic pipe for gas piping by an electrofusion method.

FIG. 3 is a perspective view showing a conventional EF joint controller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Power supply voltage measurement part 21 ... A / D conversion part 22 ... CPU 23 ... System control memory part 24 ... Indicator light 25 ... Buzzer 26 ... Liquid crystal display

Claims (2)

[Utility model registration claims] 1. A power supply voltage drop forecasting device for an electrofusion joint controller, comprising: a power supply voltage measurement unit; a CPU connected to the power supply voltage measurement unit via an A / D conversion unit; A system control memory unit and an alarm output means, and a countermeasure for avoiding an abnormal situation when the power supply voltage drops due to self-voltage drop or operation of other electric equipment while the controller is being prepared or energized. A power supply voltage drop predicting device for an electrofusion joint controller, wherein an alarm is issued when there is room to take action. 2. The controller for an electrofusion joint according to claim 1, wherein a sounding body is used as the alarm output means, and the alarm output means generates a sound that can be distinguished from other alarm sounds output in the event of an abnormal fusion or the like. Power supply voltage drop forecasting device.