JP6877887B2 - Manufacturing method of electric fusion joint and electric fusion joint - Google Patents

Description

The present invention relates to an electric fusion joint and a method for manufacturing an electric fusion joint.

Conventionally, thermoplastic resin pipes such as polyethylene pipes are widely used for gas pipes, water pipes, drain pipes, etc. because they have earthquake resistance, flexibility, and corrosion resistance.
When connecting such resin pipes to each other, an electric fusion joint (hereinafter referred to as "EF joint") is often used. Specifically, the EF joint is a joint body made of a thermoplastic resin, a heating element such as a heating wire embedded in the fusion interface on the inner peripheral surface side of the joint body, and a joint body connected to the heating element. It is provided with a terminal portion having a terminal pin erected on the outer peripheral surface of the above. Then, with the resin pipes to be connected inserted into the sockets provided at both ends of the joint body of the EF joint, the heating element is energized through the power cord connected to the terminal pin to generate heat. As a result, the resin on the inner peripheral surface of the receiving port around the heating element and the outer peripheral surface surface layer of each resin pipe are melted, and the electric fusion joint and both resin pipes are connected to form an integrated pipe line.

The EF joint is provided with a bar code or a tag for notifying the conditions at the time of fusion and the proper fusion between the inner peripheral surface side of the joint body and the outer peripheral surface side of the resin pipe.

For example, Patent Document 1 describes the information code display member in a synthetic resin welded joint in which an information code display member for displaying welding condition data read by a reader of an electric welding device is integrally provided in the joint body. Is interposed between the fixed portion fixed to the joint body, the display unit on which the information code is displayed, and the fixed portion and the display unit, and holds the display unit in a non-fixed state to the joint body. A welded joint (EF joint) including the above is disclosed. In this welding joint, the connector of the electric welding device is connected to the terminal, the bar code of the display is read by the bar code reader, and the electric welding device is electrically welded under the welding conditions according to the information of the bar code via the connector and the terminal. Is welded to the synthetic resin pipe connected to the joint.

Further, in Patent Document 2, the information about the buried pipeline is written in the ID tag that can be read and written by the non-contact type reader / writer, and the information is embedded together with the pipeline. A recognition system for a buried pipeline provided with a GPS receiver including a GPS antenna for obtaining the GPS, and a terminal capable of displaying the pipeline information about the buried pipeline read from the ID tag and the position information obtained from the GPS receiver. Is disclosed. In this buried pipeline recognition system, the ID tag is a so-called wireless non-contact ID (RFID) tag, which includes an IC module for storing various information and an antenna (coil) for transmission / reception. No power source such as a battery is required. Even if the ID tag is attached to the buried pipeline for a long period of time, the type of fluid flowing in the buried pipeline, the type of piping forming the buried pipeline, and the laying of the buried pipeline can be obtained simply by bringing the leader / writer close to the ID tag. It enables the transmission and reception of data such as the timing and the depth of the buried pipeline.

Japanese Unexamined Patent Publication No. 9-303660 Japanese Unexamined Patent Publication No. 2002-987774

However, the barcodes and tags provided on the EF joints contain information that can be read before fusion (for example, fusion conditions for EF joints, usage conditions for EF joints (for water, sewage, gas, etc.), etc.). It is desirable that both the information read at the time of energization and the start of fusion (for example, cooling time, presence / absence of energization / fusion history, etc.) can be comprehensively included. However, in the welded joint disclosed in Patent Document 1, a bar code attached to the outer peripheral surface of the joint is read by a dedicated fusion machine under the conditions necessary for welding the synthetic resin pipe and the welded joint. Therefore, the barcode may not be read, and data such as fusion conditions are stored only in the fusion machine. Further, in the buried pipeline recognition system disclosed in Patent Document 2, since the RFID is attached after the piping and the EF joint are fused, the information to be read before the fusion or at the start of the fusion is recorded in the RFID. The significance of keeping it becomes low. That is, there is a problem that the conventional connection structure including the EF joint and the EF joint does not have a tag capable of recording both the information stored before the fusion and the information written after the fusion.

The present invention has been made in view of the above circumstances, and provides an EF joint and a method for manufacturing an EF joint in which both the information stored before fusion and the information written after fusion can be easily read. To do.

The EF joint according to the present invention is an electric fusion joint that connects a plurality of resin pipes by fusion by heating, and is a resin joint body having a plurality of sockets and the resin fitted in the socket. The heating wire embedded in the fusion portion of the receiving port that abuts on the pipe, the connection heating wire that connects the heating heating wires to each other, and the joint body between the adjacent fusion portions. An IC tag that is buried in the connection heating wire and electrically connected to the connection heating wire to form an antenna function is provided , and the IC tag is provided in the central portion of the connection heating wire to serve as an antenna of the IC tag. The lengths of the functioning connecting heating wire and the heating heating wire are symmetrical on the left and right sides of the IC tag .
Here, "the antenna function is formed" means that the IC tag itself does not have an antenna and can operate, for example, using a connecting heating wire as an antenna, and the IC tag itself has an antenna. Both are included.

According to the above configuration, the IC tag forming the antenna function is provided at a position between the adjacent fused portions, that is, at a non-high temperature portion other than a portion where the temperature is raised by the heating wire for heating. Loss or erasure of the record in the IC tag due to fusion, deterioration of the IC tag, etc. are less likely to occur. As a result, both the information stored before the fusion and the information written after the fusion can be easily read from the IC tag.

According to the above configuration, when radio waves are applied from the outside of the EF joint to the heating wire and the connecting heating wire having conductivity including metal and the like, an induced current is generated from these heating wires. Then, an induced current flows through the IC tag that is electrically connected to the connecting heating wire, and this heating wire functions as an antenna of the IC tag. As a result, the IC tag obtains the power required for communication and reading / writing of internal information.
Further, since the connecting heating wire to which the IC tag can be electrically connected is a non-high temperature portion, it is possible to prevent the IC tag from malfunctioning as described above.
Further, in the present invention, since the connecting heating wire is arranged between the heating heating wires, the connection portion of the IC tag to the connecting heating wire is the heating wire of the heating heating wire and the connecting heating wire. It can be positioned substantially in the middle of the length direction of the antenna, and the length of the heating wire (antenna length) that functions as an antenna can be increased.

In the above-mentioned EF joint, the IC tag may be electrically connected to the connecting heating wire via an insulator material.
According to this configuration, when radio waves are applied to the connecting heating wire from the outside of the EF joint, an induced current is generated from the heating heating wire and the connecting heating wire, and the IC tag is passed through the insulator material. The induced current is transmitted to. Therefore, as described above, the IC tag obtains the power required for communication and reading / writing of internal information. In addition, through the insulator material, the heat from the energized connection heating wire becomes difficult to transfer to the IC tag, and the occurrence of missing or erased records in the IC tag, deterioration of the IC tag, etc. is better. This can be prevented and is effective when the amount of heat from the connecting heating wire is relatively large.
In the above-mentioned EF joint, the connection heating wire is configured to generate an induced current when a radio wave is irradiated from the outside, supply the induced current to the IC tag, and enable reading and writing of the IC tag. May be good.

The method for manufacturing an EF joint according to the present invention is the above-mentioned method for manufacturing an electrically fused joint, in which a step of winding a heating wire around a core mold and an antenna function are formed between the adjacent fused portions. placing said IC tag state, a step of fitting the resin molding die with a gap from the outside to the core mold, wherein the heating wire is wound, the resin inside the resin mold It has a step of injecting and burying the IC tag in the resin between adjacent fused portions.

According to the above configuration, when the EF joint is manufactured by injection molding, the IC tag can be arranged between the fused portions, that is, at a non-high temperature portion. Therefore, as described above, it is possible to manufacture an EF joint in which the information stored before fusion and the information written after fusion can be easily read from the IC tag.

The above-described manufacturing method of the EF joint process may further have a placing in a state of being electrically connected to said IC tag for the connecting the heating wire of the heating wire.

According to the above configuration, by arranging the IC tag in a state of being electrically connected to the connecting heating wire, the induction generated from the heating wire is generated even when the IC tag does not have an antenna. By supplying an electric current to the IC tag, it is possible to communicate with the IC tag and read / write internal information as described above.

According to the EF joint and the method for manufacturing the EF joint according to the present invention, both the information to be read before and during fusion and the information to be read after fusion can be easily read. In addition, it is possible to leave information on the fusion history and the connection, which was conventionally left only in the fusion machine, in the EF joint.

It is sectional drawing which shows one Embodiment of the EF joint which concerns on this invention. It is a top view which shows one Embodiment of the EF joint which concerns on this invention. It is a partial cross-sectional view which shows the state during fusion | fusion in one Embodiment of the EF joint which concerns on this invention. It is a partial cross-sectional view which shows the state during fusion | fusion in one Embodiment of the EF joint which concerns on this invention. It is a partial cross-sectional view which shows the state at the time of completion of fusion | fusion in one Embodiment of the EF joint which concerns on this invention. It is the schematic which shows one Embodiment of the manufacturing method of the EF joint which concerns on this invention.

Hereinafter, an embodiment of the EF joint and the method for manufacturing the EF joint according to the present invention will be described with reference to the drawings. The drawings used in the following description are schematic, and the length, width, thickness ratio, etc. are not always the same as the actual ones and can be changed as appropriate.

As shown in FIG. 1, the EF joint 1 of the present embodiment is an EF joint in which at least a plurality of (two in FIGS. 1 to 5) resin pipes 5 and 5 are connected by being fused by heating. It is embedded in a resin joint body 2 having a plurality of (two in FIGS. 1 to 5) sockets 7 and 7 and a fusion portion M of the socket 7 that abuts on the resin pipe 5 fitted in each socket 7. It includes a heating wire 3h, a connection heating wire 3x for connecting the heating wires 3h to each other, and an IC tag 20 electrically connected to the connection heating wire 3x.
The EF joint 1 is a socket, and includes a terminal portion 10 for fusing with the resin pipes 5 and 5 and an indicator 13 in addition to the above-described configuration.

The joint body 2 is a cylindrical member for internally fitting the resin pipes 5 and 5 to be connected. A stopper 9 is provided between the receiving ports 7 and 7 to prevent collision and damage of the resin tubes 5 and 5. The stopper 9 projects inward from the inner peripheral surface 2a of the joint body 2.

A heating wire 3 such as a nichrome wire is embedded on the inner peripheral surface 2a side of the joint body 2. The heating wire 3 is not particularly limited as long as it contains metal and can generate an induced current when a radio wave is irradiated from the outside of the EF joint 1.
As shown in FIGS. 1 and 2, the heating wire 3 is spirally and continuously wound along the axial direction of the joint body 2 so as to be in contact with the inner peripheral surface 2a of the joint body 2. Then, the heating wire 3 is wound tightly mainly in the central portion of one socket 7, and is sparsely wound from there at the connecting portion between the sockets 7 and 7, and is wound mainly in the central portion of the other socket 7. It is wound tightly again.

The fused portion M is a portion where the heating wire 3 is wound tightly, and when the heating wire 3 is energized, the temperature can be higher than that of the surroundings.
That is, the heating heating wire 3h is composed of a heating wire 3 that is tightly wound mainly in the central portion of the receiving port 7, and when the heating heating wire 3h is energized, the fusional portion M is formed. Form.
The connection heating wire 3x is composed of a heating wire 3 that connects the heating heating wires 3h to each other and is wound more sparsely than the heating heating wire 3h. Although FIGS. 1 and 2 show an example in which the connecting heating wire 3x is spirally provided along the axial direction of the joint body 2, it may be provided linearly.

When an IC tag 20 having no built-in antenna is used, or when only an antenna having an extremely short communication distance is built in, the IC tag 20 is electrically contacted with the connecting heating wire 3x from the outer peripheral surface side. Alternatively, it is non-electrically connected and embedded in the joint body 2. The IC tag 20 uses an electrically or non-electrically connected connecting heating wire 3x, a connecting heating wire 3x and a continuous heating heating wire 3h as an antenna, and an EF joint by an induced current from the connecting heating wire 3x. 1 is a tag that enables communication from the outside and reading / writing of various information.
The position where the IC tag 20 is provided is not particularly limited as long as it is in contact with the connection heating wire 3x, but by providing the IC tag 20 at the center of the connection heating wire 3x, the connection electric power that functions as an antenna of the IC tag 20 is provided. The lengths of the heating wire 3x and the heating wire 3h are symmetrical on the left and right sides of the IC tag 20, and the connecting heating wire 3x and the heating wire 3h function as a symmetrical dipole antenna centered on the IC tag 20. To do.
Further, the IC tag 20 may be brought into contact with the connecting heating wire 3x at a position where the length from the IC tag 20 to the terminal pin 4 is 1/4 of the communication wavelength λ.
If the IC tag 20 has an external antenna or has an antenna function inside, it is embedded in the joint body near the connecting heating wire 3x and is non-contact using a reader / writer R or the like. The antenna is not particularly limited as long as the information can be read out, but it is preferable to embed the antenna in the joint body so that the antenna is in the direction orthogonal to the pipe axis of the joint body (circumferential direction of the joint body).

Specifically, the information stored in the IC tag 20 in advance before the fusion includes the fusion conditions of the resin pipes 5 and 5 and the EF joint 1, the date of manufacture, the place of manufacture, the manufacturer, and the resin pipe 5. , 5 to each other and the use of the connection structure of the EF joint 1 (for example, for water and sewage, gas, rental, etc.), and the type of EF joint 1 (for example, socket, cheese, elbow, etc.). Not limited to. Then, such pre-stored information can be read before fusion.
Further, as the information written in the IC tag 20 after fusion, for example, information on piping construction (for example, position information, piping drawing, installation date, installer, type and model number of fusion machine used, energization / fusion). Arrival history), etc., but is not limited to this information.

A terminal portion 10 is formed on the outer peripheral surface 2b of the joint body 2 for attaching a cable connector of a fusion-wearing controller and allowing a current to flow through the heating wire 3. The terminal portions 10 are provided on the outer peripheral surfaces 2b on both end portions in the axis O1 direction of the joint main body 2, respectively.
The terminal portion 10 includes a terminal pin 4 and a connector mounting portion 12.
The terminal pin 4 projects radially outward from the outer peripheral surface 2b of the joint body 2 in the direction orthogonal to the axis O1. The end of the heating wire 3 is connected to the terminal pin 4.
The connector mounting portion 12 is provided so as to surround the terminal pin 4 from the outer peripheral surface 2b of the joint body 2 so as to be centered on the terminal pin 4 and project outward in the radial direction in the direction orthogonal to the axis O1. Further, the connector mounting portion 12 is formed in a cylindrical shape, and is integrally formed on the outer peripheral surface 2b of the joint body 2 so that the terminal pins 4 and the central axes of each other are coaxially arranged.

As shown in FIG. 1, a recess 8 is provided on the outer peripheral surface 2b of the joint body 2 from the outer peripheral surface 2b to the inner peripheral surface 2a side (that is, radially inside in the direction orthogonal to the axis O1). The recess 8 is formed with a substantially cylindrical rod-shaped indicator 13 projecting from the bottom surface 8a of the recess 8 toward the outer peripheral surface 2b side of the joint body 2 (see FIG. 2).
The indicator 13 notifies that the inner peripheral surface 2a side of the joint body 2 and the outer peripheral surface side of the resin pipes 5 and 5 are properly fused during the joining operation of joining the resin pipes 5 and 5 using the EF joint 1. Used for

Examples of the material of the joint body 2 and the resin pipe 5 include polybutene resin, high-density polyethylene resin, medium-density polyethylene resin, polypropylene resin and the like.

Next, a method of connecting the resin pipes 5 and 5 using the EF joint 1 of the present embodiment will be described.
When joining the resin pipes 5 and 5 to each other using the EF joint 1, first, the ends of the resin pipes 5 and 5 are fitted into the socket of the joint body 2.

As shown in FIG. 1, the reader / writer R irradiates the heating wire 3 with radio waves, and the induced current from the connecting heating wire 3x supplies power to the IC tag 20, and the usage conditions of the EF joint 1 (for example, for water supply, Check for sewage, gas, etc.).

Next, a cable connector C of a controller (energization device) (not shown) is attached to the pair of terminal pins 4, and the heating wire 3 is energized. At this time as well, an induced current may be generated from the connecting heating wire 3x to function as an antenna of the IC tag 20 so that communication and reading / writing can be performed.

The heating wire 3h is energized by energizing the heating wire 3, and the heating wire 3h is heated by generating heat. As shown in FIG. 3, the fused portion M is hotter than its surroundings. , And the resin of the fused portion M melts. Further, as the heating wire 3 is continuously energized, as shown in FIG. 4, the temperature rise of the fused portion M extends to the portion of the resin tube 5 in contact with the fused portion M, and the resin in that portion also melts. .. On the other hand, since the temperatures of the connecting heating wire 3x and the IC tag 20 are lower than those of the fused portion M, the information already recorded on the IC tag 20 is protected.

At this time, by equipping the fusion machine (not shown) used for fusion with the same function as the reader / writer R, the fusion machine and the IC tag 20 are made to communicate with each other, and the fusion conditions are read into the fusion machine. Let me. At this time, as precautions regarding fusion, for example, a display of the required cooling time, a display such as "Please communicate after fusion is completed", or a history of previous energization or fusion is available. Communication may be performed so as to display that the item cannot be worn or cannot be used.
Basically, once the EF joint 1 is energized, the state of the resin that has received heat changes, and the joint strength changes from that before energization, so that the EF joint 1 cannot be energized. Then, the communication is recorded in the IC tag 20 as a history. As a result, if the cable connector C comes off from the terminal pin 4 in the middle of fusion, or if the fusion stops due to insufficient power or the like, when the EF joint 1 is mistakenly reused later, At the start of the fusion, it is possible to display that there is a fusion history as described above and prevent the EF joint 1 from being reused.

As shown in FIG. 5, when the fused portion M and the resin tube 5 in contact with the fused portion M are fused and integrated, the energization of the heating wire 3 is stopped. By the above steps, the resin pipes 5 and 5 are connected using the EF joint 1.
At this time, the fusion machine and the IC tag 20 may be communicated with each other, and it may be written on the IC tag 20 that the fusion is completed normally. When the fusion is completed, the fusion machine may be displayed so that the fusion machine and the IC tag 20 communicate with each other.

In any of the above steps, construction information (for example, builder, construction date, position information, etc.) may be written in the IC tag 20.

As the communication frequency used for communication with the IC tag 20, the HF band (mainly 13.56 MHz) and the microwave band (mainly 2.45 GHz) can be used, but in particular, the UHF band (mainly 860 MHz to 960 MHz) can be used. ), It is not easily affected by the water in the pipe, and a communication distance of several meters can be obtained depending on the length of the antenna. It is possible to read out the information of the IC tag 20 and write the information to the IC tag 20 even from the ground surface on the EF joint 1 and the EF joint 1 piped to the ceiling.

Next, an embodiment of the method for manufacturing an EF joint according to the present invention will be described.
The method for manufacturing the EF joint of the present embodiment includes a resin joint body 2 having two sockets 7 and 7, a heating wire 3h embedded in a fusion portion M of the sockets 7 and 7, and heating. It is a manufacturing method of an EF joint 1 including a connecting heating wire 3x for connecting the heating wires 3h and 3h to each other, and connecting a plurality of resin tubes 5 and 5 by fusion by heating, which is a core metal. A process of winding the heating wire 3 around the mold 32, a process of arranging the IC tag 20 in a state of being electrically connected to the connecting heating wire 3x of the heating wires 3, and a core mold around which the heating wire 3 is wound. The 32 has a step of fitting the resin molding die 34 with a gap S from the outside and a step of injecting the resin into the inside of the resin molding die 34.

Specifically, in the step of winding the heating wire 3 around the core mold 32, as shown in FIG. 6A, the core mold 32 that can be separated along the axial direction is used. Subsequently, the heating wire 3 is spirally and continuously wound along the axial direction of the core mold 32. At this time, as shown in FIG. 6B, the heating heating wire 3h is wound around both the receiving ports 7 and 7, and the connecting heating wire 3x is wound around the connecting portion between the receiving ports 7 and 7.

Next, the IC tag 20 is arranged in a state of being electrically connected to the connecting heating wire 3x, and as shown in FIGS. 6 (c) and 6 (d), the core mold 32 around which the heating wire 3 is wound is arranged. A resin molding die 34 having a gate 34g for injecting a resin for injection molding is fitted into the mold 34 with a gap S from the outside.
Subsequently, the resin P is injected into the resin molding mold 34, and as shown in FIG. 6E, the resin molding mold 34 is removed after the injection molding is completed. Further, as shown in FIG. 6 (f), the core mold 32 is removed from the injection molded body of the resin P by separating the core molds 32 from each other along the axial direction. Then, as shown in FIG. 6 (g), the resin P injected into the gate 34 g from the injection molded product of the resin P is excised to obtain the EF joint 1 as shown in FIG. 6 (h). The figures from FIGS. 6 (e) to 6 (h) are shown in a state of being left-right inverted on the paper with respect to the views from FIGS. 6 (a) to 6 (d).

According to the EF joint 1 of the present embodiment described above, since the IC tag 20 is provided between the fused portions M, that is, at a non-high temperature portion, the record of the IC tag 20 is missing or erased due to the fusion. , The malfunction of the IC tag 20 is less likely to occur. Therefore, for example, if communication is performed before fusion using a non-contact reader / writer R or the like, the fusion conditions and usage conditions of the EF joint 1 can be confirmed. At the start of energization / fusion, it is possible to communicate with the fusion machine to read the fusion conditions, display the precautions regarding fusion on the fusion machine, or write the fusion history. When the fusion is completed, it can be written that the fusion is completed normally. In addition, construction information and the like can be written on the IC tag 20.

Further, according to the EF joint 1 of the present embodiment, when the conductive heating wire 3h and the connecting heating wire 3x are irradiated with radio waves from the outside of the EF joint 1, the induced current is induced from these heating wires. Is generated, and an induced current can be supplied to the IC tag that is electrically connected to the connecting heating wire. As a result, the IC tag 20 can be easily put into a state where communication and reading / writing of internal information can be performed by using the connecting heating wire 3x as an antenna.

Therefore, according to the EF joint 1 of the present embodiment, at least both the information to be read before fusion and at the start of energization / fusion and the information to be read after fusion can be easily read. As a result, it is possible to improve work efficiency such as construction of a connection structure between the resin pipe 5 and the EF joint 1.

Further, according to the method for manufacturing the EF joint 1 of the present embodiment, when the EF joint 1 is manufactured by injection molding, the IC tag 20 is placed at a non-high temperature location (that is, on the connecting heating wire 3x in the present embodiment). The IC tag 20 can be arranged and electrically connected to the connecting heating wire 3x. Therefore, as described above, the EF joint 1 that can easily read the information to be read before and during fusion and the information to be read after fusion from the IC tag 20 using a reader / writer R or the like is manufactured, and the IC at high temperature is used. It is possible to prevent damage to the tag 20 and loss of internal information.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments, and various aspects of the present invention are described within the scope of the claims. It can be transformed and changed.

For example, if the IC tag 20 is electrically connected to the connecting heating wire 3x and is embedded in a portion other than the fused portion M in the joint body 2, it must be in contact with the connecting heating wire 3x without fail. Instead, it may be adhered to the connecting heating wire 3x by a conductive adhesive, or may be connected to the connecting heating wire 3x by another heating wire (not shown).

Further, the IC tag 20 may be electrically connected to the connecting heating wire 3x via an insulator material (not shown). That is, the IC tag 20 may be arranged so as to be able to receive the induced current from the connecting heating wire 3x via the insulator material. Examples of such an insulator material include, but are not limited to, polybutene resin, high-density polyethylene resin, medium-density polyethylene resin, polypropylene resin, and the like.

Further, when the IC tag 20 has a built-in antenna, or when the IC tag 20 can be connected to the connection heating wire 3x by capacitive coupling or the like in a non-contact state, the connection power is connected to the IC tag 20. It does not have to be electrically connected to the heat ray 3x.

For example, in the case of the IC tag 20 having a built-in antenna, information can be read out from the outside of the EF joint 1 in a non-contact manner by using a reader / writer R or the like, for example, on the surface of the earth. Examples of such an IC tag 20 include a so-called RFID element and the like.

Further, as an IC tag 20 different from the above-described embodiment in which the antenna is not built-in, for example, the electromagnetic coupling module described in Japanese Patent No. 464638 can be mentioned. This electromagnetic coupling module includes a wireless IC chip and a feeding circuit board on which the wireless IC chip is mounted and including a resonance circuit having a predetermined resonance frequency. As a communication method in this electromagnetic coupling module, for example, the method described in the above-mentioned Japanese Patent No. 4674638 can be mentioned.

Further, for example, in the above-described embodiment, the joint body 2 is described as a socket as the EF joint 1, but the type and shape of the joint body 2 are not particularly limited as long as they have a plurality of receiving ports 7. , For example, elbows, reducers, cheeses and the like.

Further, when a joint body 2 having two sockets 7 and 7 and having one connector mounting portion 12 (so-called terminal) for each socket is used like a socket or an elbow, a connecting heating wire 3x is provided. Therefore, it may be configured as shown in FIG. However, when each socket has two connector mounting portions, or when a joint body having three sockets is used, for example, the heating wire is completely energized at each socket, and the connecting heating wire 3x is often not provided. .. In such a case, since the heating wire cannot have the role of an antenna, it is preferable to use the IC tag 20 having a built-in antenna as described above.

Further, in the above-described embodiment, one IC tag 20 is provided at a position (position of the connecting heating wire 3x) between two fusion portions (positions where the heating heating wire 3h is arranged). The configuration, that is, one IC tag 20 is provided in one EF joint 1, but a plurality of IC tags may be provided in one EF joint. For example, in the case of an EF joint having three fusion portions, it is possible to arrange IC tags between adjacent fusion portions, and two IC tags are provided in one EF joint. Become.

Further, a barcode on which fusion information is recorded may be attached to the outer peripheral surface of the joint body 2. As a result, depending on the construction site, fusion construction can be performed even when only an old-fashioned controller that does not have a non-contact reader / writer function is prepared.

Further, when the controller is connected to the terminal portion 10 of the EF joint 1, the connecting heating wire 3x and / or the heating heating wire 3h of the EF joint 1 is used as a transmitting antenna to transmit radio waves having a wavelength in the HF band. It may communicate with the IC tag 20 in the EF joint. Depending on the construction site, different types of EF joints may be in close proximity, and if communication is performed using a UHF band reader / writer, there is a possibility of communicating with the adjacent EF joint instead of the target EF joint. Since the communication distance in the HF band is short, there is no erroneous communication with the adjacent EF joint.
Further, when the connecting heating wire 3x and the ID tag 20 are electrically connected by a conductor such as solder, the controller and the ID tag 20 perform wired communication via the heating wire 3, and the fusion conditions and the like. May be read.
Further, the output of the radio wave of the reader / writer R of the controller may be reduced so as to communicate only with the target EF joint 1 so as not to be mixed with other adjacent EF joints 1.

1 ... EF joint (electric fusion joint), 2 ... joint body, 3 ... heating wire, 3h ... heating wire, 3x ... connection heating wire, 20 ... IC tag, 32 ... core mold, 34 ... resin Mold for molding

Claims (5)

An electric fusion joint that connects multiple resin pipes by fusion by heating.
A resin joint body with multiple sockets and
A heating wire embedded in a fused portion of the socket that comes into contact with the resin pipe fitted in the socket, and a heating wire for heating.
A connection heating wire that connects the heating heating wires to each other,
An IC tag that is buried in the joint body between adjacent fused portions and electrically connected to the connecting heating wire to form an antenna function.
Equipped with a,
The IC tag is provided at the center of the connecting heating wire, and the lengths of the connecting heating wire and the heating heating wire that function as antennas of the IC tag are symmetrical on the left and right sides of the IC tag . Electric fusion joint. The IC tag is electrically connected to the connecting heating wire via an insulating material.
The electrically fused joint according to claim 1. The connecting heating wire is configured to generate an induced current when a radio wave is irradiated from the outside, supply the induced current to the IC tag, and enable reading and writing of the IC tag.
The electrically fused joint according to claim 1 or 2. The method for manufacturing an electrically fused joint according to any one of claims 1 to 3.
The process of winding the heating wire around the core mold,
Placing said IC tag state of forming an antenna function between the fusion part adjacent,
The process of fitting the resin molding mold into the core mold around which the heating wire is wound with a gap from the outside.
A step of injecting a resin into the inside of the resin molding die and burying the IC tag in the resin between adjacent fused portions.
A method for manufacturing an electrically fused joint. It has a step of arranging the IC tag in a state of being electrically connected to the connecting heating wire among the heating wires.
The method for manufacturing an electrically fused joint according to claim 4.

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