JP4036791B2 - Electric fusion method - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a method for electrofusion welding an electrofusion joint and a resin pipe.
[0002]
[Prior art]
For example, in the case of a socket joint, an electric fusion joint and a resin pipe are joined by inserting the resin pipe into the joint, clamping the resin pipe and fixing, and then connecting the connector of the electric fusion device (controller) to the terminal of the joint. And then setting the fusion parameters such as voltage value and energization time by setting the fusion parameters such as voltage value and energization time applied to the joint, and setting the fusion parameters such as voltage value and energization time. One method is to supply a weak inspection current to the joint prior to supplying the fusion current, read the resistance value of the heating wire, and set the fusion parameter according to the resistance value region. .
[0003]
[Problems to be solved by the invention]
If the connector or terminal is soiled or has an oxide film, or if the connector and terminal are in poor contact due to poor connector insertion, the joint resistance may be measured incorrectly. Therefore, electric energy different from the electric energy that should be originally applied is applied, and there is a possibility that smoke may be generated at the time of fusion or poor fusion may occur.
[0004]
An object of the present invention is to provide an electric fusion method that solves the above-described problems and that allows electric fusion to be normally applied to perform normal fusion.
[0005]
[Means for solving problems]
The invention according to claim 1 reads the resistance value of the heating wire embedded in the joint by passing a weak inspection current through the electric fusion joint, and fuses the voltage value, energization time, etc. according to the resistance value region. In the method of electric fusion between the electric fusion joint and the resin pipe, which is performed by supplying the fusion current after setting the adhesion parameters, the supply of the fusion current is started and the energization is temporarily stopped after the set time has elapsed. Then, the resistance value of the heating wire is measured by supplying a weak inspection current, and the electric welding is performed using the voltage value or the energization time corresponding to the region of the resistance value as a fusion parameter.
[0006]
The contact failure between the connector and the terminal often restores conduction by supplying a fusion current, and the resistance value can be accurately measured. Therefore, if the resistance value is measured after supplying the welding current for a short time, accurate measurement is possible and normal fusion is possible.
[0007]
In the present invention, the resistance value may be measured only after supplying the welding current for a short time, but is preferably performed before and after supplying the welding current for a short time. In the former case, a certain fusion current is supplied to the joint, and this fusion current may be excessive for the joint, but there is no particular problem because it is a short time. In the latter case, a fusion current corresponding to the joint can be supplied.
[0008]
In the invention according to claim 2, in the invention according to claim 1, the resistance value of the heating wire is measured before and after supplying the fusion current for a short time, and when the obtained resistance values do not match, the inspection current is The resistance value is re-measured by flowing again, and when the obtained resistance value coincides with the resistance value measured immediately before, the voltage value and energization time according to the area of this measured value are used as the fusion parameters. It is characterized by performing fusion.
According to the present invention, normal fusion is possible.
[0009]
Another invention reads a resistance value of a heating wire embedded in the joint by passing a weak inspection current through the electric fusion joint, and determines a fusion parameter such as a voltage value and an energization time according to the region of the resistance value. After setting, in the method of electric fusion between an electric fusion joint and a resin pipe, which is performed by supplying a welding current, the resistance value of the heating wire is measured before and after supplying the welding current for a short time. When the two resistance values do not match, the fusion is stopped .
According to the invention, by measuring the resistance of the heating wire before supplying fusing current, Ruue can supply fusing current corresponding originally to the area of the resistance value, the fusing current By performing the fusion only when the joint resistance values measured before and after the start of supply coincide with each other, poor fusion due to poor contact between the connector and the terminal can be reliably prevented.
[0010]
Still another invention is characterized in that in the above invention, the fusion is stopped and a warning is displayed by a warning display means.
According to the present invention, the fusion stop can be easily known.
As the warning display means of the present invention, for example, an alarm sound by a buzzer, a warning light, etc. can be exemplified.
[0011]
According to the present invention,
In the above inventions, the matching of both resistance values is not only that each resistance value exactly matches, but that each resistance value falls within the resistance value region set for each type and size of the joint, or Including those that fall within the range set for each resistance value.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a controller 1 as an electrofusion apparatus used in the method of the present invention. The controller 1 turns on and off the supply of a constant fusion current sent from a fusion power supply 2 to an electrical fusion joint 3. 1 switch means 4, a second switch means 7 for turning on and off the supply of a weak constant voltage inspection current sent from the inspection constant voltage power source 5 to the electric fusion joint 3, and an inspection current It comprises an ammeter 8 for measuring the current value, a memory 11 constituting the control device 9, an inspection means 12, a collation means 13, a CPU 14 and a clock mechanism 15, a monitor television 16 and a buzzer 17.
[0013]
Hereinafter, each component of the control apparatus 9 mentioned above is demonstrated in order.
The memory 11 includes a storage unit 11a that stores a program when the electrofusion joint 3 and the resin pipe 6 are electrofused, a storage unit 11b that stores a table in which energization time is set for each region of the electrical resistance value, The resistance value calculated by the CPU 14 when the inspection current is applied, the energization time read from the storage unit 11b, the set time until the first switch unit 4 is turned on and temporarily turned off are stored. It consists of a storage unit 11c.
[0014]
The search means 12 has a function of obtaining the energization time corresponding to the resistance value area obtained by calculation by the CPU 14 from the table stored in the storage unit 11 b of the memory 11 and outputting this to the CPU 14.
The collating means 13 collates the resistance value stored in the storage unit 11c of the memory 11 with the resistance value newly calculated by the CPU 14, and the resistance value is set for each joint type and size. It has a function of outputting each signal to the CPU 14 when it falls within the value area (hereinafter referred to as “match”) or when it does not fit (hereinafter referred to as “mismatch”).
[0015]
The CPU 14 controls the first switch means 4 to be ON-controlled by the output signal when the start button 18 is pressed, the output signal when the fusion start button 19 is pressed, and the input signal from the collating means 13 for the second. The function of ON-controlling the switch means 7 and the resistance from the output from the ammeter 8 that measures the current value of the weak test current supplied from the power source 5 to the joint 3 when the second switch means 7 is turned ON. A function for calculating a value, a function for counting output signals from the clock mechanism 15 and controlling the OFF of the first and second switch means 4 and 7 when the count number corresponding to the set time is reached, a fusion start button When the fusion is started by pressing 19, and when the fusion is finished or stopped, the monitor TV 16 displays the display before and after the collation means 13 starts the fusion. As a result of checking the resistance values, the above means are controlled on the basis of a function for outputting a warning sound by outputting to the buzzer 17 when both resistance values do not match, and a program stored in the storage unit 11a of the memory 11. It is also possible to have the function of the collating means 13. In this case, the collation means is not necessary.
[0016]
Next, an example of the fusion method using this apparatus will be described based on the flowchart shown in FIG. At the time of fusion, first, the resin pipe 6 is inserted into the joint 3, and the resin pipe 6 is clamped and fixed by a clamp (not shown), and then the connector 21 of the controller 1 is inserted into the terminal 22 of the joint 3. Thereafter, when the start button 18 is turned on (step 1), the second switch means 7 is turned on for a certain period of time, and during that time, a weak constant voltage, for example, about 10 mmA of inspection current is passed through the joint 3 ( Step 2), the current value i ₁ measured by the ammeter 8 is input to the CPU 14 of the control device 9. The CPU 14 calculates the electric resistance value R ₁ of the heating wire 3 a of the joint 3 from the current value i ₁ and the voltage v of the power source 5 (step 3), and stores it in the storage unit 11 c of the memory 11. At the same time output to the retrieval means 12, retrieval means 12 reads the current time corresponding to thereby from the table stored in the storage unit 11c of the resistance value R ₁ region (step 4).
[0017]
When the energization time is read, the CPU 14 stores the energization time in the storage unit 11 c of the memory 11 and displays “Fusable” on the monitor television 16.
The operator sees this display and turns on the fusion start button 19 (step 5). As a result, the first switch means 4 is turned ON, and the fusion current is supplied from the power source 2 to the joint 3 (step 6). When the set time stored in the storage unit 11c of the memory 11, for example, 1 second has elapsed after the supply is started, the first switch means 4 is turned off by the control signal from the CPU 14, and the supply of the fusion current is stopped. , second switching means 7 a predetermined time again turned ON, the test current flows from the power supply 5 (step 7), thereby the CPU14 from the voltage v of the current i ₂ and the power source 5, which is measured by the ammeter 8 calculating the electric resistance value _{R 2} (step 8).
[0018]
Collating means 13, the electrical resistance against the electric resistance value _{R 1,} which is stored in the storage unit 11c of the _{R 2} and memory 11 (step 9), the CPU14 when matching ON the first switching means 4 To. As a result, the supply of the welding current is resumed and the fusion is performed (step 10). When a predetermined energization time stored in the storage unit 11c has elapsed (step 11), the first switch means 4 is turned off, the energization is interrupted, and the fusion is completed (step 12). Then, the end of fusion is displayed on the monitor TV 16.
[0019]
On the other hand, when the collating means 13 determines R ₁ R ₂ in step 9, the CPU 14 outputs to the monitor TV 16 to display the fusion stop, and outputs to the buzzer 17 to generate an alarm sound (step 13). The first switch means 4 is maintained in the OFF state.
[0020]
In the said embodiment, although the measurement of the resistance value of the heating wire 3a is performed before and after supplying the fusion current, in another method, it is not performed before supplying the fusion current, and the fusion current is supplied. Only after that.
[0021]
In yet another method, step 13 shown in FIG. 2 is replaced with the step shown in FIG. That is, in step 9 shown in FIG. 2, when R ₁ R ₂ , the electrical resistance value stored in the storage unit 11 c of the memory 11 is rewritten from R ₁ to R ₂ and the second switch means 7 is turned ON again. Then, a weak inspection current is supplied from the power source 5 to the joint 3 (step 14). Thus the measured current value in the same manner, the electrical resistance value R ₃ are determined (step 15). The collating means 13 collates the electric resistance value _{R 2} stored as the electric resistance value _{R 3} in the storage unit 11c (step _16), when R 2 = _{R 3,} first switch the output from CPU14 The means 4 is turned on, the supply of the welding current from the power source 2 is resumed, and the fusion is performed (step 17). When a predetermined energization time has elapsed (step 18), the first switch means 4 is turned off, the energization is interrupted, and the fusion is completed (step 19). When the fusion is finished, the end is displayed on the monitor TV 16.
[0022]
On the other hand, the matching unit 13 in step 16 determines that the R ₂ R _3, together with the fused stops the monitor television 16 is an output display, and generates an alarm sound by outputting a buzzer 17 (step 20).
[0023]
【The invention's effect】
According to the invention relating to claim 1, the resistance value of the heating wire embedded in the joint is measured, and the welding parameters such as the voltage value applied to the joint and the energization time are set according to the resistance value region. In the electrical fusion method, even if the joint resistance value is erroneously measured due to poor fusion between the connector and terminal, the resistance value is measured after the supply is temporarily stopped after supplying the fusion current. By doing so, it becomes possible to measure an accurate resistance value, thereby applying electric energy that should be originally applied to enable normal fusion, and preventing smoke generation or poor fusion during fusion. be able to.
[0024]
According to the second aspect of the present invention, the joint resistance value can be accurately obtained by performing re-measurement of the resistance value, and normal fusion can be performed.
[Brief description of the drawings]
FIG. 1 is a block diagram of an electrofusion apparatus.
FIG. 2 is a flowchart showing an example of the method of the present invention.
FIG. 3 is a flowchart showing another example of the method of the present invention.
[Explanation of symbols]
1 .. Controller 2 .. Fusion power supply 3 .. Electrical fusion joint 4 .. First switch means 5 .. Power supply 6 for inspection .. Resin pipe 7 .. Second switch means 8 .. Current Total 9 ・ ・ Control device 11 ・ ・ Memory 12 ・ ・ Inspection means 13 ・ ・ Verification means 14 ・ ・ CPU
15. · Clock mechanism 16 · · Monitor TV 17 · Buzzer 18 · Start button 19 · Fusion button 21 · Connector 22 · Terminal

Claims (2)

Read the resistance value of the heating wire embedded in the joint by passing a weak test current through the electric fusion joint, set the welding parameters such as voltage value and energization time according to the resistance value area, and then In the method of electric fusion between an electric fusion joint and a resin pipe, which is performed by supplying a wearing current, after the set time has elapsed since the start of supplying the fusion current , the energization is temporarily stopped, and then a weak inspection current is supplied. An electric fusion method characterized in that a resistance value of a heating wire is measured, and electric fusion is performed using a voltage value or energization time corresponding to a region of the resistance value as a fusion parameter. The resistance value of the heating wire is measured before and after supplying the welding current for a short time, and when the obtained resistance values do not match, the test current is re-flowed and the resistance value is measured again. 2. The electrofusion according to claim 1, wherein when the resistance value measured immediately before that coincides with the resistance value, electrofusion is performed using a voltage value or energization time corresponding to the measured value region as a fusion parameter. How to wear.

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