JPH11291355A - Method and apparatus for electric fusion bonding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to continue fusion bonding when fusion bonding is stopped and to avoid the increase in operation costs. SOLUTION: The supply voltage of a powder source to be supplied is detected, the fusion bonding current or fusion bonding voltage to be supplied to the heater 15 of a joint 2 is detected, When abnormality is generated in the supply voltage, the fusion bonding voltage, or the fusion current during electric fusion bonding, the progression of a fusion bonding time is interrupted, the fusion bonding amperage or the fusion bonding voltage and a fusion bonding progression time are stored, a fusion bonding stop time is measured, when the supply voltage, the fusion bonding voltage, or the fusion bonding current is restored, the stored fusion bonding progression time is reduced from a set fusion bonding time to obtain a residual fusion bonding time, the residual fusion bonding time is corrected by a correction coefficient by the fusion bonding progression time and the fusion stop time and started up to the fusion bonding amperage or the fusion bonding voltage, and the fusion bonding is continued for the corrected residual fusion bonding time. In this way, the optimum fusion bonding similar to that in the case when no interruption took place is guaranteed to continue the fusion bonding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electrofusion (EF).
TECHNICAL FIELD The present invention relates to a method and an apparatus for electro-fusing a joint and a resin tube.

[0002]

2. Description of the Related Art Generally, when a resin pipe and a resin joint are fused by electrofusion, an end of the resin pipe is inserted into a joint portion of the resin joint, and the joint is joined to the joint portion by an electric fusion device. By energizing the embedded heating wire (heater), the joint portion and the end of the resin pipe are melted, and thereby the joint portion of the resin joint and the end of the resin pipe are fused.

At this time, if the power supply voltage supplied to the electric fusion device or the voltage applied to the heater fluctuates rapidly (decreases), the operation of the electric fusion device is stopped, and the fusion of the resin pipe and the resin joint is stopped. I have stopped wearing it. Thereafter, even if the power supply voltage returns, the fusion cannot be continued.

[0004] The causes of the sudden fluctuation (decrease) of the power supply voltage and the voltage applied to the heater include abnormal stop and voltage fluctuation of the generator used as the power supply, disconnection of the power supply line, and disconnection of the output cable to the heater. , Output cable connector disconnection, etc.

[0005]

At present, when fusion by an electric fusion device is stopped halfway, a resin pipe and a resin joint are cut out, a new joint is mounted, and fusion is performed again. In addition, there is a problem that the resin joint is wasted and the working time is increased, thereby increasing the construction cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric welding method and apparatus which can continue welding when an interruption of welding occurs and can avoid an increase in construction cost.

[0007]

In order to achieve the above-mentioned object, an invention according to claim 1 of the present invention is a method for electro-fusing an electro-fusion joint and a resin tube, and is provided. The supply voltage of the power supply is detected, and the fusion voltage or the fusion current supplied to the heater of the joint is detected. During the electric fusion, an abnormality occurs in any of the supply voltage, the fusion voltage, or the fusion current. Then, the progress of the fusion time is interrupted, the fusion voltage or fusion current before interruption and the fusion progress time are stored, the fusion stop time is measured, and the supply voltage or fusion voltage or fusion current is measured. Is restored, the stored fusion progress time is subtracted from the set fusion time to obtain the remaining fusion time, and the remaining fusion time is corrected by a correction coefficient based on the fusion progress time and the fusion stop time. , The fusion voltage or the fusion current before the interruption It is characterized in carrying out the fusion welding time only.

According to the above method, the fusion data such as the fusion voltage immediately before the interruption of the fusion is stored, and when the supply voltage or the fusion voltage or the fusion current is restored, a new fusion is performed based on the fusion data immediately before the interruption. The adhesion information is formed, and based on the fusion information, the electric fusion is restarted and the fusion is continued. At this time, the remaining fusion time is corrected by the fusion progress time and the stop time, and the fusion is reliably performed.

According to a second aspect of the present invention, there is provided an apparatus for electro-fusion between an electro-fusion joint and a resin tube, comprising: a supply voltage detecting means for detecting a supply voltage of a power supply to be supplied; A welding voltage detecting means for detecting an applied welding voltage or a welding current detecting means for detecting a welding current supplied to a heater of the joint; and a supply voltage detecting means for detecting the applied voltage during electric welding. A supply voltage, a middle stage means for interrupting the progress of the fusion time when an abnormality occurs in any of the fusion voltage detected by the fusion voltage detection means or the fusion current detected by the fusion current detection means; A fusion voltage detected by the fusion voltage detection means before interruption or a fusion current detected by the fusion current detection means,
Storage means for storing the fusion progress time; measuring means for measuring the fusion stop time; and when the supply voltage or the fusion voltage or the fusion current returns, the stored fusion progress time is subtracted from the set fusion time. Then, the remaining fusion time is obtained, the remaining fusion time is corrected by a correction coefficient based on the fusion progress time and the fusion stop time, and the correction is performed by raising the fusion voltage or the fusion current before interruption. And an arithmetic control unit for performing fusion for the remaining fusion time.

According to the above configuration, the electrofusion method of claim 1 is realized.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an electric fusion apparatus having a fusion interruption function and a re-fusion function when a power supply is abnormal in an embodiment of the present invention.

In FIG. 1, reference numerals 1A and 1B denote plastic tubes made of a polyolefin resin, and 2 denotes an electric fusion (EF) joint made of a polyolefin resin. A heating wire (heater) 15 embedded in the EF joint 2 The two plastic tubes 1A and 1B are joined via the EF joint 2 by energizing and electrically fusing the EF joint 2 and the ends of the plastic tubes 1A and 1B.

Reference numeral 3 denotes a supply voltage (hereinafter referred to as a primary voltage) supplied from the generator 4 and a primary voltage sensor (also serving as a frequency sensor) for detecting a frequency. Reference numeral 5 denotes a supply to the heater 15 of the EF joint 2. Fusion current (hereinafter referred to as secondary current)
6 is a heater 15 of the EF joint 2
Is a secondary voltage sensor that detects a fusion voltage (hereinafter, referred to as a secondary voltage) applied to the sensor. These sensors 3, 5, 6
Are input to the control device 7.

The control device 7 is connected with an operation switch 9 including a fusion start button switch, a fusion stop button switch, and the like, and a bar code reader 10 as operation input means, and a temperature sensor 11 is connected thereto. A digital display 12 is connected as a means, and a buzzer
13 is connected. The control device 7 is connected to a heater 15 of the EF joint 2 via a cable 16.

As shown in FIG. 2, each of the sensors 3, 5,
The detection signal of No. 6 is amplified by three amplifiers 21A, 21B and 21C. The voltage detection signal of the primary voltage sensor 3 amplified by the amplifier 21A is converted into a pulse signal by a waveform shaping circuit 22, and the pulse signal is counted by a frequency counter 23. The frequency is detected and input to the power control unit 32 and the abnormality detection unit 33 of the controller 27 composed of a microcomputer.

The voltage detection signal of the primary voltage sensor 3 amplified by the amplifier 21A is converted to an effective value signal by an AC (alternating current) / effective value converter 24 and amplified by the amplifier 21B.
The current detection signal of the secondary current sensor 5 is rms (effective value) / D
The voltage detection signal of the secondary voltage sensor 6 which is converted into a DC signal by the C (DC) converter 25 and further amplified by the amplifier 21C is converted into a DC signal by the rms (effective value) / DC (DC) converter 26. The data is input to an analog / digital (A / D) conversion unit 31 of the controller 27, is converted into digital data by the A / D conversion unit 31, and is input to the power control unit 32 and the abnormality detection unit 33 of the controller 27.

The detection signal of the temperature sensor 11 is directly input to the A / D converter 31 of the controller 27,
31 is converted to digital data by the controller
27 is input to the temperature detection unit 34 and converted into temperature data.
The power is input to the power control unit 32 and the abnormality detection unit 33.

The bar code read by the bar code reader 10 is inputted to a bar code input unit 35, and the fusion information for each type of the joint 2 stored in advance is retrieved from the bar code for use. The fusion information of the joint 2 is obtained and input to the power control unit 32 and the abnormality detection unit 33. When the secondary voltage is controlled to a predetermined constant voltage, the detailed fusion information set by the fusion information is shown in FIG.
“Rated fusion current value (100% fusion current)” and this 100
It consists of a "soft start period" in which the secondary current rises to a% fusion current, a "fusion time at a constant voltage", and a "soft stop time" in which the secondary current falls.

A command signal (on / off signal) for starting / stopping fusion of the operation switch 9 is directly input to the power control unit 32 of the controller 27. A power supply circuit 29 and a power output unit 30 of the control device 7 are connected to the generator 4 via a power switch 28 provided in the control device 7. Power supply circuit 29
Forms a control power supply that converts alternating current to direct current and lowers the voltage, and includes amplifiers 21A, 21B, and 21C and a waveform shaping circuit 22.
, Frequency counter 23, converters 24, 25, 26 and controller
Power to 27. The power output unit 30 is connected to the heater 15 of the joint 2, and the heater of the joint 2 is controlled by pulse width control in accordance with a drive signal output from the power control unit 32 of the controller 27.
Energize 15

The digital display 12 has a controller
27 display control units 36 are connected. This display control unit 36
Forms display data according to the data from the power control unit 32 and the abnormality detection unit 33, and outputs the display data to the display 12;
Display the data on 12. In addition, a power supply backup battery 37 is connected to the power supply circuit 29 and is constantly charged.
If an abnormality occurs in the power supply such as a sudden drop in the supply voltage while the power switch 28 is on, the abnormality detection unit 33 detects the abnormality and performs the current processing by predetermined processing before each unit becomes inoperable due to the power supply drop. Are detected and stored in a predetermined memory. This memory is supplied by the battery 37 even after the power supply drops. The abnormality detection unit includes a clock supplied with power from the battery 37, and counts the power interruption time.

Further, the buzzer 13 is sounded according to the drive signal from the abnormality detecting section 33. The operation of the power control unit 32 according to the secondary voltage constant control will be described with reference to the flowchart of FIG. The rated voltage (secondary voltage) for constant control is set in the power control unit 32 in advance.

First, when the fusion information is input from the bar code input section 35 (step-1), the corresponding "rated fusion current value (100% fusion current)" and "soft start period" are obtained from the fusion information. The fusion splicing detailed information, which is preliminarily stored in the memory and is composed of the "fusion time at constant voltage" and the "soft stop time", is extracted and set (step-2). continue,
Based on the temperature data input from the temperature detection unit 34,
The "fusion time at constant voltage" is corrected (step-3).
For example, if the temperature is lower than 20 ° C., a fusion time inversely proportional to the temperature is determined. Next, the fusion information is output to the display control unit 36, and the fusion information is displayed on the display 12 (step-4).

When a fusion start command signal (ON signal) is input from the operation switch 9 (step-5), a fusion start signal is output to the abnormality detecting section 33 (step-6), and power control of the heater 15 is performed. (Step-7). Power control is performed as follows while counting time (measuring time).

As shown in FIG. 5, based on the fusion information,
First, during the “soft start period”, the secondary current is slowly started up to the 100% fusion current value, and the rated voltage (for example, 40
After reaching V), the operation shifts to constant voltage control. After the "fusion time at constant voltage", the secondary current is reduced to zero by the "soft stop time".

During this power control, when a fusion stop command signal (ON signal) is input from the operation switch 9 (step-8), or when a fusion stop command signal is input from the abnormality detector 33 (step 8). 9), stop the control and reduce the secondary current to 0 (step-10).

When a fusion interruption command signal, which will be described later, is input from the abnormality detection unit 33 (step-11), the control is interrupted, the secondary current is reduced to 0, and a standby state is set (step-11).
12), when the fusion information at the time of resuming fusion is input from the abnormality detection unit 33 (step-13), the fusion information, that is, the “start-up fusion voltage value” and the “soft start period”, which will be described later.
And "(remaining) fusion time at constant voltage" and "soft stop time" are stored (step-14). Then, when a fusion restart command signal, which will be described later, is input from the abnormality detection unit 33 (step-15), the process returns to step-7, and power control (secondary voltage constant control) is performed based on the fusion information at the time of restarting the fusion. ) Is resumed.

When the control is stopped or the fusion is completed (Step-16), a fusion termination signal is output to the abnormality detecting section 33 (Step-17), and the fusion termination data is output to the display control section 36. Then, the end of fusion is displayed on the display 12 (step-18), and the process is terminated.

The operation of the abnormality detecting section 33 will be described with reference to the flowchart of FIG. First, the barcode input section 35
When the fusion information is input (step-1), predetermined detailed fusion information is extracted from the memory, and the detailed fusion information is set (step-2). Subsequently, when a fusion start signal is input from the power control unit 32 (step-3),
Reset the number n of interruptions of fusion (n = 0) (step-
4) The fusion progress time T is reset (T = 0) (step-5), and then the fusion progress time T is counted (timed) (step-6). Next, the data of the fusion state, that is, the primary voltage value, frequency, secondary voltage value, secondary current value,
The temperature data and the measured fusion progress time T are stored (step-7).

Whether the primary voltage value is normal, that is, does not fluctuate (decrease), or whether the secondary voltage exceeds a predetermined allowable width M (see FIG. 6) due to fluctuations in the primary voltage and frequency. Or whether the secondary current has risen for a moment (step-8).
It is confirmed whether or not a fusion end signal has been input (step-9). If confirmed, the process is terminated. If not confirmed, the process returns to step-6 to count the fusion progress time T and to check the data of the fusion state. Continue updating.

In step-8, when it is confirmed that the primary voltage value has decreased, or that the secondary voltage has fluctuated due to the fluctuation of the primary voltage value and the frequency, or that the secondary current has risen, the number n of interrupted fusions is reduced to the allowable number of interruptions. Check if N or more (Step-
10) If the number of interruptions is equal to or greater than the allowable interruption number N, a fusion stop command signal is output to the power control unit 32 (step-11), and the process ends.

When the number of times of fusion interruption n is smaller than the allowable number of interruptions N, 1 is added to the number of fusion interruptions n (n = n + 1) (step -12), and a fusion interruption command signal is output to the power control unit 32. (Step-13), and further outputs a drive signal to the buzzer 13 to sound the buzzer (Step-14), outputs the data of "interruption of fusion" to the display control unit 36, and displays it on the display 12 (Step 13). Step-15). Subsequently, the data of the fusion state (fusion data immediately before the interruption) is stored as basic information at the time of resuming fusion (step-16).

Then, the fusion stop time S is reset (S
= 0) (step-17), the fusion stop time S is counted (timed) (step-18). Until the primary voltage, the frequency, the secondary voltage, and the secondary current return (Step-19),
The counting of the fusion stop time S is continued.

When the primary voltage value, the frequency, the secondary voltage value, and the secondary current are restored, the (remaining) fusion time correction coefficient α (according to the fusion progress time T and the measured fusion stop time S). ≧
Select 1) (Step-20). When the fusion progress time T is long, the correction coefficient α is reduced, and when the fusion stop time S is long, the correction coefficient α is increased.

Next, the remaining fusion time U is calculated according to equation 1 (step-21). Remaining fusion time U = α (set fusion time−fusion progress time T) (1) Next, it is determined whether or not the fusion stop time S is shorter than a predetermined time (for example, several seconds) (step-22). ), If it is short, set the "soft start period" to 0 (step-
23) If it is long, the soft start period of the fusion information stored in step-2 is set as "soft start period" (step-24).

Next, fusion information at the time of resuming fusion (hereinafter referred to as resumption fusion information) is formed (step-25). That is, based on the stored basic information and the fusion information stored in step 2, a secondary voltage value of the basic information is set as a “start-up fusion voltage value” corresponding to a 100% fusion voltage, The soft stop period of the fusion information is set as the “soft stop time”, and the remaining fusion time U obtained by equation (1) is set as the “(remaining) fusion time at a constant voltage”. The time set in steps -23 and 24 is set as the "start period".

Next, the restart fusion information is output to the display control unit 36 and displayed on the display 12 (step-26), and the restart fusion information is output to the power control unit 32 (step-27). To output a fusion restart command signal to the power control unit 32 (step-2).
8) Return to step-5.

The operation of the above configuration will be described below.
According to the fusion information based on the bar code input from the bar code reader 10 by the power control unit 32, the secondary current, the secondary voltage, and the fusion time of the heater 15 are controlled as shown in FIG. Optimum fusion is performed by the EF joint 2 while maintaining the voltage at a constant voltage.
Will be displayed. During the power control, when a fusion stop command signal (ON signal) is input from the operation switch 9 or a fusion stop command signal is input from the abnormality detection unit 33, the power control unit 32 stops the control and outputs the secondary current. Is reduced to 0, and the processing ends.

Also, as shown in FIG. 5, when the primary voltage value becomes 0, or as shown in FIG. When it exceeds, or when the secondary current rises for a moment, the abnormality detection unit 33 determines that the power supply is abnormal, whereby the interruption command is output to the power control unit 32, the control is interrupted, and the secondary current is reduced to zero. Is placed in a standby state. Further, data of the fusion state immediately before the interruption is stored, and the fusion stop time is measured.
Then, when the power is restored, the remaining fusion time is corrected by the fusion progress time T and the fusion stop time S, the soft start time is set, and the fusion information at the time of restart is formed. Then, the electric fusion is restarted based on the fusion information.
Also, when the number of power failures n overlaps, the power control is stopped.

As described above, when the fusion is interrupted and the power is restored, the fusion information at the time of resumption is formed based on the data of the fusion state immediately before the interruption, and the electrical fusion is performed based on the fusion information. By resuming, it is possible to guarantee the same optimal fusion as when there is no interruption and continue the fusion, and it is not necessary to replace the joint 2 and the plastic pipes 1A and 1B as in the conventional case. In addition, an increase in construction cost can be avoided by shortening the work time.

When fusion is stopped or interrupted, an abnormality detection unit
By looking at the data of the immediately preceding fusion state stored in 33, it is possible to know what state or cause caused the fusion suspension or interruption.

In the present embodiment, in the operation of the abnormality detecting section 33, when the return of the power supply is determined in Step-19 (FIG. 4), the restart fusion information is formed and the fusion is automatically performed. Although resumed, as shown in FIG. 7, the information on the possibility of power return / re-fusion is output to the display control unit 36 and displayed on the display 12 (step-A), and the work is performed based on the display of this information. The operator may confirm the fusion start command signal (ON signal) input from the operation switch 9 (step-B) to form the re-fusion fusion information. This allows the operator to confirm the judgment and intention when the fusion is continued.

Further, in this embodiment, as shown in FIG. 5, the fusion is performed while maintaining the secondary voltage (fusion voltage) constant, that is, by performing the fusion voltage constant control.
As shown in (2), the fusion can be performed while the secondary current (fusion current) is kept constant, that is, by the fusion current constant control. At this time, as a condition for interrupting the fusion, in the fusion voltage constant control, “the primary voltage value decreases, or the secondary voltage varies due to the variation of the primary voltage value and the frequency, or the instantaneous rise of the secondary current”. On the other hand, in the fusion current constant control, “the primary voltage value decreases, or the secondary current changes due to the primary voltage value and frequency fluctuations, or the instantaneous drop of the secondary voltage” Confirm. Further, as the fusion splicing information, the fusion voltage constant control sets the “secondary voltage value of the basic information as the“ start-up fusion voltage value ”, whereas the fusion current constant control sets“ secondary voltage value of the basic information ”. The “secondary current value of the basic information” is set as the “start-up fusion current value”.

Further, in the present embodiment, the data of the fusion state immediately before this is not displayed, but it is also possible to display the data on the display 12 when the fusion is stopped or interrupted.
Further, in the present embodiment, the digital display 12 is provided as the display means.
RT or the like may be provided. Buzzer 13 as alarm means
Although a buzzer may be provided, a chime or an alarm lamp may be provided instead. Although the fusion information is input using a barcode, it may be input using another input means such as a keyboard, or may be connected to a higher-level computer and input (transmitted) from the higher-level computer. .

Although power is supplied to the fusion device by the generator 4, power may be supplied from a general power supply (commercial power supply).

[0045]

As described above, according to the present invention, the fusion information at the time of restart is formed based on the data of the fusion state immediately before the interruption of fusion, and the electrical fusion is resumed based on the fusion information. By doing so, it is possible to guarantee the same optimal fusion as when there is no interruption, to continue the fusion, and to avoid an increase in the construction cost.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an electrofusion apparatus that executes an electrofusion method according to an embodiment of the present invention.

FIG. 2 is a block diagram of the electric fusion device.

FIG. 3 is a flowchart illustrating an operation of a power control unit of the electric fusion device.

FIG. 4 is a flowchart illustrating an operation of an abnormality detection unit of the electric fusion device.

FIG. 5 is a characteristic diagram at the time of electrofusion of the electrofusion device.

FIG. 6 is a characteristic diagram when the primary voltage and the frequency fluctuate during the electric fusion of the electric fusion device.

FIG. 7 is a flowchart of a main part for explaining an operation of an abnormality detection unit of the electrofusion device according to another embodiment of the present invention.

FIG. 8 is a characteristic diagram at the time of electrofusion of an electrofusion device according to another embodiment of the present invention.

[Explanation of symbols]

 1A, 1B Plastic pipe 2 Electrofusion (EF) joint 3 Primary voltage sensor 4 Generator 5 Secondary current sensor 6 Secondary voltage sensor 7 Control device 9 Operation switch 10 Bar code reader 11 Temperature sensor 12 Digital display 13 Buzzer 15 Joint heater 16 Cable 27 Controller 32 Power control unit 33 Error detection unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideki Double 64 Ishizukita-cho, Sakai-shi, Osaka Inside Kubota Vinyl Pipe Factory

Claims (2)

[Claims] 1. A method for electro-fusion between an electro-fusion joint and a resin tube, comprising detecting a supply voltage of a supplied power supply, and detecting a fusion voltage or a fusion current supplied to a heater of the joint. If any of the above-mentioned supply voltage, fusion voltage, or fusion current occurs during electrofusion, the fusion time is interrupted, and the fusion voltage or fusion current before interruption is reduced to the fusion voltage. The fusion time is stored, the fusion stop time is measured, and when the supply voltage, fusion voltage or fusion current is restored, the stored fusion progress time is subtracted from the set fusion time to calculate the remaining fusion time. The remaining fusion time is corrected by a correction coefficient based on the fusion progress time and the fusion stop time, and is raised to the fusion voltage or the fusion current before the interruption, and the fusion time is corrected for the remaining fusion time. An electrofusion method characterized by performing welding. 2. An apparatus for electro-fusion between an electric fusion joint and a resin tube, comprising: a supply voltage detecting means for detecting a supply voltage of a supplied power; and a fusion voltage applied to a heater of the joint. A fusing voltage detecting means for detecting or a fusing current detecting means for detecting a fusing current supplied to a heater of the joint; a supply voltage detected by the supplying voltage detecting means during electric fusion; A middle stage means for interrupting the progress of the welding time when an abnormality occurs in either the fusion voltage detected by the detection means or the fusion current detected by the fusion current detection means; and the fusion before interruption. Storage means for storing the fusion voltage detected by the voltage detection means or the fusion current detected by the fusion current detection means, fusion progress time; measuring means for measuring the fusion stop time; Voltage or melting When the welding voltage or the welding current returns, the stored welding progress time is subtracted from the set welding time to obtain the remaining welding time, and the remaining welding time is used as the welding progress time and the welding stop time. An electrofusion apparatus comprising: an arithmetic control unit that corrects with a correction coefficient according to Equation (1), raises to a fusion voltage or a fusion current before interruption, and performs fusion for the corrected remaining fusion time.