JPH0868488A - Electric-fusion-welded joint, current feeding time control method thereof, and electric-fusion-welding device - Google Patents

Abstract

PURPOSE: To make the current feeding time appropriate so as to be able to identify the sort and bore of a joint by setting the electric resistance value and the current feeding time at the relationsihip of 1:1, and setting electric energy necessary for fusion- welding univocally. CONSTITUTION: After detecting environmental temperature by a temperature sensor 70, the terminal of a controller 60 is connected to the connector 65 of a joint 10, and micro voltage is applied to both ends of a connector pin to measure the resistance value R1 of a heating wire. This resistance value R1 is compared with a preset R-t chart to set the current feeding time t1, and correction corresponding to the environmental temperature is applied to set the current feeding time t2. A fushion-welding start button 73 is then switched on, and the voltage between both ends of the connector pin is taken again in a relatively early stage in the course of current application to measure the resistance value R2 at this time. The initial resistance value R1 and the resistance value R2 are compared, and at the time of R1≠R2, a buzzer is continuously sounded to inform abnormaliy. At the time of R1=R2, current feeding is stopped upon the lapse of the current feeding time t2, and a buzzer 74 is intermittently sounded to inform the completion of fusion-welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric fusion joint in which a heating wire is embedded in a joint body made of a thermoplastic resin (hereinafter, may be simply referred to as a joint), and the heating wire of this joint is energized. Accordingly, the present invention relates to a method for controlling an energization time when an electric fusion connection is made between a pipe and a joint, and an electric fusion device used at this time.

[0002]

2. Description of the Related Art Conventionally, it is well known to connect a pipe made of a thermoplastic resin material such as polyethylene or polybutene to a joint by electric fusion. In addition, as a method for controlling the energization time at this time, first measure the electrical resistance of the heating wire embedded inside the electric fusion splicing joint to determine the joint type and diameter (the diameter is the nominal diameter of the connection port, and the type is a socket or cap). Etc. type)
The optimum energizing time that has been set for each fitting type diameter in advance is selected, and the energizing time control method of the so-called identification method that automatically energizes only this time (Patent Fair 3 -27014).

Further, in this kind of electric fusion joint, there are a double-ended joint having two fusion connection ports like a socket and a single-ended joint having one fusion connection port like a cap. Conventionally, the heating wires used for these have the same characteristics and are continuously wound around the connection port. Therefore, the electrical resistance value of the joint was twice as large as that of the socket joint having both ports than that of the cap joint having one port.

[0004]

However, in the above-mentioned energization time control method, since the electric resistance of the heating wire itself usually has a variation of several%, when there are many kinds,
In some cases, there was an unavoidable portion in the design where the ranges of electrical resistance for each product type diameter overlap, and it was not possible to identify the important product type diameter. Further, as described above, in the conventional electric fusion splicing joint, when trying to identify the product type and the diameter, even if the diameter is the same, the socket (both joint) and the cap (single joint) have an electric resistance value of 2: 1. Therefore, there is a case where the socket having a small diameter and the cap having a large diameter have substantially the same electric resistance value. At this time, if the identification is incorrect, the socket may be over-fused and the cap may be insufficiently fused. Therefore, from this point as well, there is a problem that the diameter of the product type cannot be identified. In addition, in general, if the electrofusion apparatus is provided with an identification function, the structure and control become complicated and the cost becomes high.

The present invention is applicable to joints of various kinds of items,
An object of the present invention is to provide an energization time control method capable of uniquely setting an appropriate energization time, an electric fusion device, and an electric fusion joint whose electric resistance can be easily adjusted in this control method.

[0006]

The present invention has achieved the above object by making the electrical resistance value and the energizing time have a one-to-one relationship in order to uniquely set the electrical energy required for fusion bonding. It is a thing. That is, according to the present invention, the energization time t with respect to the electric resistance value R of the heating wire provided in the electric fusion joint.
Are prepared in advance in a one-to-one correspondence Rt diagram, the electric resistance value R1 of the heating wire of the joint to be fused is measured, and the Rt diagram and the electric resistance value R1 are compared. This is a method for controlling the energization time of the electric fusion joint, in which the energization time t1 to the joint is obtained, and the energization is stopped after the lapse of t1 time from the start of the energization. In the above, the ambient environmental temperature is measured, and one of the energizing time, the current value, and the voltage value or 2 is applied according to the ambient temperature.
It is desirable to adjust the electric energy required for fusion welding each time. It is also desirable to newly measure the electric resistance value R2 during the fusion work and compare this with R1 to issue an alarm when it is outside the predetermined range. As the R-t diagram, the electric resistance value R and the energization time t monotonically increase or monotonically decrease. A combination of two or more graphs in which the electric resistance value R and the energization time T have a monotonically increasing relationship, or a combination of two or more graphs in a monotonically decreasing relationship is desirable.

Further, according to the present invention, the R-t line in which the R-t diagram is stored in which the energization time t is in a one-to-one correspondence with the electric resistance value R of the heating wire provided in the electric fusion joint is stored. Figure storage section,
Resistance value measuring means for measuring the electric resistance value R1 of the heating wire of the joint to be fused, the R-t diagram and the electric resistance value R
1 and the energization start instruction means for setting the energization time t1 by comparing 1 with the energization start command means t1
An electric fusion device having an energization stop command means for issuing an energization stop command after a lapse of time. In the above, it is desirable to include a temperature measuring unit that measures the ambient environmental temperature, a correction unit that corrects the energization time, the current value, or the voltage value according to the environmental temperature.

Further, according to the present invention, the electric resistance of the heating wire embedded in the electric fusion joint and the energization time correspond to each other on a one-to-one basis, and the electric energy required for fusion is different for each joint type diameter. Is an electric fusion-bonded joint uniquely set. This may be performed by providing a heating wire portion for welding which is embedded in the fusion-bonding portion of the electric fusion joint, and a heating wire portion for adjustment for adjusting the electric resistance value of the heating wire.

[0009]

In the energization time control method of the present invention, the electrical resistance value R and the energization time t are in a one-to-one correspondence for each product diameter.
Since these are set on the R-t diagram in advance, the energization time t is obtained by measuring the electric resistance value R,
Electric energy (hereinafter referred to as fusion energy) E necessary for fusion is uniquely given. Here, if the energization time is corrected in accordance with the ambient environmental temperature, that is, the variation of the resistance value depending on the fusion site, season, etc., a better fusion state can be obtained.
In addition, the current value may be corrected and the voltage value may be corrected and controlled in the current control method and the voltage control method, respectively, instead of the energization time. This will be appropriately selected according to the fusing device and the situation.
In addition, the fact that the resistance value R1 before fusion work and the resistance value R2 during work, that is, during energization are outside the predetermined range (for example, the difference between R1 and R2 is 5% or more) means that there is an abnormality such as a resistance measurement error. It means that it has occurred, and since the energization is stopped by this, defects can be prevented beforehand.

The above fusion energy is generally proportional to the fusion area of the joint. However, if the fusion energy is determined only by the fusion area, the pipe and the joint having a large diameter have a large wall thickness, so that insufficient fusion occurs. If the diameter is small, the wall thickness is also small, resulting in over-fusion. Therefore, it is necessary to set the optimum fusion energy by considering both the diameter of the joint and the fusion area. In the present invention, the fusion energy per connection port is set to 1: 1 so as not to overlap for each diameter type of the joint, and the measured electrical resistance is irrespective of the type such as single-ended or double-ended. The energization time is uniquely determined based on the value, and as a result, the fusion energy according to the diameter and the wall thickness of the joint is supplied.

The R-t diagram may be a straight line or a curved line as long as the electric resistance value R and the energization time t have a one-to-one correspondence, but in the case of the constant current control system, the fusion energy is Since E and Rt are in a proportional relationship, it is easy to set them on the upward-sloping monotonically increasing diagrams as shown in FIGS. On the other hand,
In the case of the constant voltage control method, since Rt is in inverse proportion, it is easy to set a downward-sloping monotonically decreasing diagram. For the single-ended joint and the double-ended joint, it is easy to set a diagram such as Fig. 2 which is a combination of the R-t diagram for the single-ended joint and the R-t diagram for the double-ended joint. Although the resistance value is 2 to 1, the energization time is the same for both of them, so that the fusion energy per mouth is the same. In addition, since there is little change in the wall thickness and the fusion-bonded area where the diameter is small, it is possible to set even in a smooth diagram as shown in FIG.

The electric fusion joint of the present invention may include a heating wire portion for adjustment that uniquely sets the welding energy, in addition to the heating wire that contributes to the welding. This is done by extra winding around the part other than the connection part to make the fusion energy per port the same, or the heating wire material used is one with a high electrical resistance value for the single-ended joint or one with a small thickness. Can be modified by the fitting, such as by using or a combination of these.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. First, the energization time control method according to the present invention will be described with reference to FIGS. The figure shows the relationship (Rt diagram) between the electrical resistance R and the energization time t of each type of the electric fusion splicer, and Fig. 1 shows a monotonically increasing line and Fig. 2 shows two types of monotonically increasing lines. FIG. 3 is an example of a combination of diagrams of monotonous increase with different inclinations. The solid line in FIG. 1 shows the relationship between the range of the electrical resistance R and the energization time t of the socket nominal diameter of 10 mm (S10), 13 mm (S13) and 16 mm (S16), and the broken socket nominal diameter of 13 × 1.
0 mm (RS13 x 10) and 16 x 13 mm (RS16 x
13 shows the relationship between the range of the electric resistance R of 13) and the energization time t.

The range of the electric resistance R of each electric fusion joint is S
10 is 1.50Ω ± 0.12Ω, S13 is 2.0Ω ± 0.16
Ω, S16 is 2.50Ω ± 0.20Ω, RS13 × 10 is 1.75Ω ± 0.14Ω, RS16 × 13 is 2.30Ω ± 0.
18Ω. The allowable range of the electric resistance R is generated from the allowable range of quality such as manufacturing error of the heating wire itself and fusion strength. As can be seen from the figure, the ranges of electric resistance of S13 and RS13 × 10 and S16 and RS16 × 13 overlap each other, and the conventional method cannot discriminate the type and diameter of the joint. On the other hand, in the energization time control method according to the present invention, it is not necessary to identify the product type caliber size, and the energization time t corresponding to the electrical resistance R of the electric fusion joint is given in a one-to-one manner. If the electric resistance R is 1.84Ω which is the lower limit of the tolerance, the energization time t is 26.8.
When the second is automatically given and the electric resistance R of RS13 × 10 is 1.89Ω which is the upper limit of the tolerance, the energization time t is 27.8.
Seconds are automatically given. As a result, the optimum fusion energy set for each product diameter is given to each.

Normally, the nominal diameters of the joint and the pipe are proportional to their respective wall thicknesses. That is, as the diameter increases, the wall thickness of the joint and the pipe also increases. Therefore, the heat capacity of the fused portion also increases as the diameter increases, and a large amount of fusion energy is required. Figure 1 shows an embodiment according to the constant current control method, since the fusion energy larger along with the nominal diameter is large, according to become large diameter ^{_{(E n = I 2 Rt (}} I = constant) from) It increases with the electric resistance R and the energization time t. In the present embodiment, the relationship between the electric resistance R and the energization time t is set on the diagram represented by t = 20R-10, but it is not necessary to be limited to this mathematical expression, and t = 20 depending on the size and material of the joint. a ₁ R + b ₁ or t = a ₂ R
It is performed by selecting the optimum one from the relationship of monotonic increase represented by ² + b ₂ . Here, a ₁ , a ₂ , b
₁ and b ₂ are constants.

In the case of the constant voltage control method as another method, since the fusion energy increases as the nominal diameter increases (from En = V ² t / R (V = constant)), the electrical resistance increases. R is reduced, and the energization time t is lengthened.
Therefore, the relationship between the electric resistance R and the energization time t is t = a3 /
Is carried out by choosing the best one among the monotonically decreasing relationship represented by R + b3 or t = a ₄ R + b _4, and the like. Here, a ₃ , a ₄ , b ₃ , and b ₄ are constants. However, a ₄ <
0. Therefore, as an example of the constant voltage control method,
Although not shown, the electrical resistance R and the energization time t are set on a diagram represented by a monotonous decrease in a downward rightward manner as in inverse proportion.

FIG. 2 shows a second embodiment of the R-t diagram. In this example, a diagram t = 10R + 15 for a single-ended joint such as a cap (Ca) and a diagram t = 5R + 15 for a double-ended joint such as a socket (S) are combined. Although the ordinate represents the energization time t and the abscissa represents the electrical resistance R here, it may be as shown in FIG. As you can see from the figure, Ca20, 25, 30, 40 and S20,
The eight items 25, 30, and 40 are each set to have a one-to-one energization time t with respect to the electric resistance R. And C
Looking at a and S for each same size, the electrical resistance R is set to 1: 2 and the energization time t is set to be the same. For example, the electric resistance R of Ca20 is about 1.6Ω, that of S20 is about 3.2Ω, and the energization time t is 31 seconds for both. Therefore, since the fusion energy per mouth is the same for both Ca and S, both can perform good fusion under the same conditions.

FIG. 3 shows a third embodiment of the R-t diagram. In this example, a diagram t = 1R + 26 for a small aperture and a diagram t = 5R + 15 for a relatively large aperture are continuously combined. For example, in the case of Ca10 to S13 having a small diameter, since the fusion area and the wall thickness do not change so much, it is possible to set the electric resistance R so that it does not overlap even if the energization time t hardly changes, or even if it overlaps a little. Since the required fusion energy of the above is almost unchanged, a suitable one can be provided. Such a diagram can also be set as an example. Incidentally, the R-t diagram of the present invention is not limited to the above example, and other modified examples are possible. For example, when the diameter is 8 to 50 mm, there are about 40 types of fused portions, but in this case, the electric resistance value R can be set within the range of about 0.5 to 9 Ω. Also, as in the above example of monotonous increase, R of monotonous decrease
It goes without saying that the -t diagram can be used.

Next, an embodiment of the electric fusion joint of the present invention will be described. 4 to 8 show an embodiment in which a heating wire is additionally wound around a portion other than the fusion-bonded portion to adjust the electric resistance value of the entire joint. FIG. 4 is a sectional view of a socket of a double-ended joint, 5 to 7 are cross-sectional views of the cap of the single-ended fitting, and FIG. 8 is a cross-sectional view of the adapter fitting for connecting a water tap or the like. First, the socket joint shown in FIG.
The fusion splicing ports 11 and 12 for fusion splicing are provided, and the heating wires 13a and 13b are continuously wound in the shape of a coil near the inner surfaces of the fusion splicing ports 11 and 12. Both ends of the heating wire 13 are connector pins 14 and 15 protruding from the socket body 10.
The power supply of the controller is connected to the connector pins 14 and 15 to energize the heating wire 13. The heating wire portion 13 for adjustment other than the fusion-bonded portion
c is the joint body 10 due to heat generated when the pipe 1 is fused.
So as not to melt or deform, the winding diameter is set larger than the heating wire winding diameter at the fusion splicing ports 11 and 12 and is arranged at approximately the center of the wall thickness of the joint body 10. It is larger than the pitch. This additional heating wire part 13
Adjusting the length of c and the number of turns, R-t for each product diameter
Can be set on the diagram.

In the cap joint of FIG. 5, the cap body 2
Fusion splicing port 21 for fusion splicing the resin pipe 1 to the inner surface of 0
There is a closing wall 22 that closes the end. A heating wire 23 is wound around the fusion splicing port 21 and connector pins 24, 2 are provided on both ends thereof.
5 are connected. The material and overall length of the heating wire 23 and the length of the heating wire 23a wound around the fusion splicing port 21 are the same as those of the heating wire 13a per fusion splicing port of the socket joint shown in FIG. And the fusion splicing port 2 on the closing wall 22 side
Additional heating wire 2 for adjusting the electric resistance value of the whole in a portion 26 other than the fusion splicing port which is distant to the extent that it hardly affects 1
3c is wound. The portion 26 other than the fusion splicing port around which the additional heating wire 23c is wound is formed such that the thickness of the joint body 20 is thicker than that of the fusion splicing port 21, and the heating wire 23c is provided at substantially the center of this thick wall. Heating wire 23 wound around fusion splicing port 21
It is wound larger than the winding diameter of a. In this way, the heat effect of the heating wire 23c is not given to the fusion splicing port 21 portion, and the cap body 20 is not deformed by the heat effect.

In the cap joint of FIG. 6, the cap body 30 is provided with the same heating wire material and length as the socket joint of FIG. The additional heating wire 33c for adjustment is the fusion splicing port 3
The heating wire 33a of the fusion splicing port 31 is wound on the inlet side of 1 with a diameter larger than that of the heating wire 33a, and a metal ring 36 is provided on the inner diameter side. Therefore, the metal ring 36 absorbs the heat effect due to the heating of the extra heating wire portion and does not affect the fusion splicing port 31 portion.

The cap joint of FIG. 7 has the same heating wire specifications as the socket joint of FIG. 4, and has an additional heating wire 43c for adjustment.
Is covered with a heat insulating material 46 such as glass fiber and wound around the outer surface of the cap body 40 to be connected to the connector pin 45. The heat of the additional heating wire 43c is the glass fiber heat insulating material 46.
Is blocked by the fusion splicing port 41 and the cap body 40.
It does not affect the heat.

FIG. 8 shows an adapter joint having a fusion splicing port 51 and a metallic female screw connecting port 52. The metallic female screw insert 57 and a resin-made adapter joint body 50 are integrally formed with the insert 57. It is a molded product. Also in this case, the heating wire uses the same heating wire as the socket joint of FIG. The additional heating wire 53c is embedded in the joint body on the insert 57 side, and the heat generated by the additional heating wire 53c is absorbed by the insert 57 at the time of fusion bonding with the resin pipe and affects the fusion connection port 51 with the resin pipe. I try not to reach. In the above-mentioned embodiment, the same heating wire as the socket joint was used to adjust the resistance value in the additional heating wire portion for adjustment, but it can be adjusted by changing the material and wire diameter. You may For example, a heating wire made of a material having a large specific resistance value may be used for the cap joint, or the wire diameter of the heating wire may be reduced.

Next, the electric fusing device of the present invention, that is, the controller will be described. The controller of the embodiment described below is a constant current control system in which the input power supply AC100V is converted into a constant current power supply with a current of 5.5 A (variable) inside the controller, and the energization time control is the electrical resistance value for each joint as described above. R is read, and temperature correction is added to this to set the energization time t. FIG. 9 is a block diagram of the controller of the embodiment. Here, the fusion power source unit 63 converts the current into a constant current power source of 5.5 A through a breaker 61 and a relay 62 in the controller 60. After that, the connector 66 can be connected to the connector pin on the joint side via the relay 64.

Next, there is provided a resistance value setting means 66 for measuring and storing the electric resistance of the heating wire between the connector pins, where the initial resistance value R1 and the resistance value R2 during energization are measured. The initial resistance value R1 is sent to the R-t diagram storage unit 67 that stores a predetermined R-t diagram in advance, and the energization time t1 corresponding to the resistance value R1 is set by the energization time setting means 68.
On the other hand, it has a temperature sensor 70 such as a thermistor for measuring the ambient environment temperature and a corrected energization time t2 setting means 69 for compensating the energization time based on this environment temperature. Since the energization time t2 may be obtained at the same time without setting t1, the energization time setting means 66 and 69 may be combined. Further, it has a comparison means 71 for comparing the resistance value R1 measured at the initial stage with the resistance value R2 measured during energization, and a continuation stop instruction means 72 for instructing to stop or continue energization according to the comparison result. The comparison means may judge whether R1 and R2 are within a predetermined range or not. For example, when a heating wire whose resistance value does not depend on temperature is used, it is simply judged whether the difference is within an allowable amount. become. The above-mentioned means and others are placed in the microcomputer CPU 77 and controlled. The energization start command means 73 for instructing the start of energization is turned on / off by a fusion start button attached to the upper surface of the main body, and an emergency stop button is additionally provided on this surface.

The external display (LCD) unit 75 displays energization time (countdown), size display and input voltage abnormality, output current abnormality, wire short circuit (this is monitored during the energization period), connector dropout, overheat, environment. Alarms such as abnormal temperature (-10 ° C or lower or 40 ° C or higher) are detected and displayed. Reference numeral 74 is a buzzer which outputs audio in conjunction with the alarm display and the power supply stop command, or when fusion is completed. In addition, it is possible to control the fusion power supply and relay by ON / OFF by the above alarm,
And it is designed to work together with the stoppage of energization. Reference numeral 76 denotes a control power source and an accessory power source unit. The control power source is, for example, an analog power source a, a CPU power source b, a relay power source c, and an accessory tool power source d.

Next, the fusion control operation of the controller of the embodiment will be described with reference to the flow chart of FIG. It should be noted that the numbers attached to the drawings may not necessarily match the control order in some embodiments. Turn on the controller power. At the same time, check the input voltage, frequency and leakage. Along with the above checks, the ambient temperature is detected by a temperature sensor. Then connect the controller terminals to the connector pins of the joint. A small voltage is applied to both ends of the connector pin, and the resistance value R1 of the heating wire is measured. The energization time t1 is set by comparing the resistance value R1 with a preset R-t diagram. After the energization time t1 is set, or simultaneously with the setting, the energization time t2 is set by adding the correction according to the environmental temperature. The energization time t2 is obtained by the following equation, for example. t2
= T1 x {1- (environmental temperature -23 ° C) x temperature correction coefficient}
The temperature correction coefficient is preferably about 0.006 to 0.01, and 0.008
Is more preferable. Actually, it is not necessary to set the energization time t1 if t2 is simultaneously calculated by the above equation. When the correction based on the environmental temperature is not added, the energization may be stopped at time t1. Turn on the fusion start button. The voltage between the connector pins is again measured at a relatively early time (within about 5 seconds) while the fusion current (5.5 A) is being applied, and the resistance value R2 at this time is measured. The initial resistance value R1 and the resistance value R2 at the time of fusion are compared. 10 When R1 ≠ R2 (with 5% tolerance), an alarm signal is output as an error and the buzzer sounds continuously. 11 When R1 = R2 (with allowance 5% added), continue energizing. 12 When the energization time t2 has elapsed, the energization is stopped.
And the buzzer of fusion completion is sounded with an intermittent sound. As described above, the control of the energization time is simple in terms of control because the time is simply set based on the resistance value of the heating wire without identifying the diameter of the joint type.

[0028]

According to the present invention, the energization time is directly obtained from the electric resistance of the heating wire of each joint regardless of the product diameter, and the optimum fusion energy is automatically given.
There are no mistakes such as misidentification, and stable fusion splicing can be performed in terms of quality. In addition, the control becomes simple and the electric fusion device becomes simple. In addition, the electric fusion joint has a heating capacity per fusion splicing port that is substantially the same for both the two-port joint and the one-port joint so that the fusion area of the joint and the pipe can be varied according to the fusion area and the wall thickness. Energy can be applied.

[Brief description of drawings]

FIG. 1 is an R-t diagram showing a relationship between an electric resistance R and an energization time t for explaining an embodiment of an energization time control method of the present invention.

FIG. 2 is an R-t diagram of the second embodiment.

FIG. 3 is an Rt diagram of the third embodiment.

FIG. 4 is a sectional view of a socket joint showing an embodiment of the electric fusion joint of the present invention.

FIG. 5 is a sectional view of a cap joint showing a second embodiment.

FIG. 6 is a sectional view of a cap joint showing a third embodiment.

FIG. 7 is a sectional view of a cap joint showing a fourth embodiment.

FIG. 8 is a sectional view of an adapter joint showing a fifth embodiment.

FIG. 9 is a block diagram showing an embodiment of an electric fusing device (controller) of the present invention.

FIG. 10 is a flowchart showing an example of fusion control.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Resin pipe 10 Socket joint main body 13, 23, 33, 43 Heating wire 13c, 23c, 33c, 43c, 63c Heating wire other than fusion splicing port part 20, 30 and 40 Cap joint main body 22 Cap closing wall 36 Metal Ring 46 Heat insulating material 50 Adapter joint body 52 Female screw connection port 57 Female screw insert 60 Electric fusion bonding device (controller) 66, 69
Resistance value setting means 67 R-t diagram storage section 68 Energization time setting means 70 Temperature sensor 71 Comparison means 72 Energization stop command means 73 Energization start means 74 Alarm means (buzzer) 75 External display section

Claims (12)

[Claims] 1. A relation R- in which an energization time t has a one-to-one correspondence with an electric resistance value R of a heating wire provided in an electric fusion joint.
The t-chart is prepared in advance, the electric resistance value R1 of the heating wire of the joint to be fused is measured, and the energization time t1 to the joint is calculated by comparing the electric resistance value R1 with the R-t chart. A method for controlling the energization time of an electric fusion joint, which is characterized in that the energization is stopped after the time t1 has elapsed from the start of energization. 2. A relation R- in which the energization time t has a one-to-one correspondence with the electric resistance value R of the heating wire provided in the electric fusion joint.
On the other hand, prepare a t-diagram in advance, measure the ambient environment temperature, measure the electrical resistance value R1 of the heating wire of the joint to be fused, and compare the R-t diagram with the electrical resistance value R1. The energization time t1 to the joint is determined by the energization time t2 which is obtained by correcting the energization time t1 according to the environmental temperature, and after the energization is started, the electrical resistance value R2 during energization is measured, The value R1 is compared with the electric resistance value R2 to obtain R
When 1 and R2 are within the predetermined range, energization is continued, and R
When 1 and R2 are out of a predetermined range, an alarm is given, and the energization time control method of the electric fusion joint is characterized in that the energization is stopped after a lapse of t2 time after the energization is started. 3. The electric energy required for fusion is corrected by adjusting any one or two of an energization time, a current value, and a voltage value according to the ambient environment temperature. 3. A method for controlling an energization time of the electric fusion joint according to 1 or 2. 4. The electric fusion joint according to claim 1, wherein the R-t diagram has a relationship in which the electrical resistance value R and the energization time t monotonically increase or monotonically decrease. Energization time control method. 5. The R-t diagram is a combination of two or more graphs in which the electrical resistance value R and the energization time t have a monotonically increasing relationship, or two or more graphs in a diagram having a monotonically decreasing relationship. It is a combination, The energization time control method of the electric fusion joint of Claim 1 or 2 characterized by the above-mentioned. 6. The energization time control of an electric fusion joint according to claim 1, wherein the R-t diagram is a combination of monotonically increasing or monotonically decreasing diagrams each having a different inclination. Method. 7. A relationship R- in which an energization time t has a one-to-one correspondence with an electric resistance value R of a heating wire provided in an electric fusion joint.
An R-t diagram storage unit that stores a t-line diagram, a resistance value measuring unit that measures an electrical resistance value R1 of a heating wire of a joint to be fused, the R-t diagram and the electrical resistance value Electricity having an energization time setting means for setting an energization time t1 by comparing with R1, an energization start command means, and an energization stop command means for issuing an energization stop command after a lapse of t1 hours after the start of energization. Fusing device. 8. A relationship R- in which the energization time t corresponds to the electric resistance value R of the heating wire provided in the electric fusion joint in a one-to-one relationship.
An R-t diagram storage unit that stores a t-line diagram, a resistance value measuring unit that measures an electrical resistance value R1 of a heating wire of a joint to be fused, the R-t diagram and the electrical resistance value Energization time setting means for setting the energization time t1 by comparing with R1, ambient temperature measuring means for measuring the ambient temperature, and energization for correcting the energization time t1 according to the ambient temperature to set the energization time t2. With the time setting means, the electric resistance value R2 is measured during energization, and the electric resistance value R1 is measured.
And an electric resistance value R2 are compared with each other, an alarm means for issuing an alarm when the electric resistance values R1 and R2 are out of a predetermined range, an energization start instruction means, and an energization stop instruction after a lapse of t2 time from the start of energization. An electric fusion device, comprising: 9. The electric resistance value of the heating wire embedded in the electric fusion joint and the energization time are made to correspond to each other on a one-to-one basis, and the electric energy required for the fusion is uniquely set for each diameter of the type of the joint. An electric fusion splicing joint characterized in that 10. An electric heating wire portion for heating and welding, which is embedded in a welding portion of an electric welding joint, and an electric heating wire for uniquely setting electric energy required for welding for each diameter type of the joint. And a heating wire portion for adjustment for adjusting the electric resistance value of the electric fusion joint. 11. The electric fusion-bonding joint according to claim 10, wherein the heating wire portion for adjustment is extraly wound around a portion other than the fusion-bonding portion. 12. The electric heating wire according to claim 10, wherein the heating wire portion for adjustment is adjusted by changing the thickness and / or material of the heating wire of the double-ended joint and the single-ended joint. Fusion joint.