JP2017180652A - Electric fusion joint and manufacturing method of electric fusion joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an EF joint capable of easily reading out information to be read before or in fusion and information to be read after fusion, without using fusion machines dedicated to both information.SOLUTION: An EF joint 1 applied with this invention is an electric fusion joint connecting a plurality of resin pipes 5, 5 with fusion by heating, and includes: a resin joint body 2 having a plurality of sockets 7, 7; electric wires 3h for warming buried in a fusion part M of the socket 7; an electric heating wire 3x for connection connecting the electric heating wires 3h, 3h for warming; and an IC tag 20 buried between adjacent fusion parts M, and configured to exhibit an antenna function.SELECTED DRAWING: Figure 1

Description

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

Conventionally, thermoplastic resin pipes such as polyethylene pipes are widely used for gas pipes, water pipes, drain pipes and the like because they have earthquake resistance, flexibility, and corrosion resistance.
When such resin pipes are connected to each other, an electric fusion joint (hereinafter referred to as “EF joint”) is often used. Specifically, the EF joint is made of a thermoplastic resin joint body, a heating element such as a heating wire embedded in the fusion interface on the inner peripheral surface side of the joint body, and the joint body connected to the heating element. And a terminal portion having terminal pins erected on the outer peripheral surface. And in the state which inserted the resin pipe of connection object in the receptacle provided in the both ends of the joint main body of EF joint, respectively, it supplies with electricity through the power cord connected to the terminal pin, and a heat generating body is made to heat. As a result, the resin on the inner peripheral surface of the receptacle around the heating element and the outer peripheral surface layer of each resin tube are melted, and the electrofusion joint and both resin tubes are connected to form an integral conduit.

  The EF joint is provided with a bar code and a tag for notifying the conditions at the time of fusion, the fact that the inner peripheral surface side of the joint main body and the outer peripheral surface side of the resin pipe are properly fused, and the like.

  For example, Patent Document 1 discloses a synthetic resin welding joint in which an information code display member for displaying welding condition data read by a reader of an electric welding apparatus is provided integrally with a joint body. Are a fixed part fixed to the joint body, a display part for displaying an information code, and a connecting part interposed between the fixed part and the display part to hold the display part in an unfixed state on the joint body The welding joint (EF joint) provided with these is disclosed. This welding joint connects the connector of the electric welding device to the terminal, reads the barcode on the display unit with a barcode reader, and electrically connects the electrical welding device through the connector and the terminal under the welding conditions according to the barcode information. Is welded to the synthetic resin pipe connected to the joint.

  Japanese Patent Laid-Open No. 2004-228688 embeds information on an embedded pipeline in an ID tag that can be read and written by a non-contact type reader / writer, and embeds it along with the pipeline, and includes position information on a detection device in which the reader / writer is installed. Embedded system including a GPS receiver including a GPS antenna for obtaining the information and a terminal capable of displaying the pipeline information related to the buried pipeline read from the ID tag and the position information obtained from the GPS receiver Is disclosed. In this buried pipe recognition system, the ID tag is a so-called wireless non-contact ID (RFID) tag, and includes an IC module for storing various types of information and a transmission / reception antenna (coil). A power source such as a battery is not required. And 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 set just by bringing the reader / writer close to the ID tag. Enables transmission and reception of data such as time and depth of buried pipelines.

JP-A-9-303660 JP 2002-98774 A

  However, information read before fusion, such as barcodes and tags provided on EF joints (for example, EF joint fusion conditions, EF joint use conditions (for water, sewage, gas, 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 included. However, in the welding joint disclosed in Patent Document 1, the bar code attached to the outer peripheral surface of the joint is read by a dedicated welding machine under conditions necessary for fusion between the synthetic resin pipe and the welding joint. Therefore, there are cases where the barcode cannot be read, and data such as the fusion condition is stored only in the fusion machine. Further, in the buried pipe recognition system disclosed in Patent Document 2, since RFID is attached after the pipe and the EF joint are fused, information to be read before the fusion or at the start of the fusion is recorded on the RFID. The significance of keeping is reduced. That is, the conventional EF joint and the connection structure including the EF joint have a problem that the tag that can record both the information stored before the fusion and the information written after the fusion is not provided.

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

The EF joint according to the present invention is an electric fusion joint that is connected by fusing a plurality of resin pipes by heating, and a resin-made joint body having a plurality of receptacles, and the resin fitted in the receptacles A heating wire embedded in a fusion part of the receptacle that contacts the pipe, and an IC tag embedded between adjacent fusion parts and having an antenna function. And
Here, “the antenna function is formed” means that the IC tag itself does not have an antenna but can operate, for example, with a connecting heating wire as an antenna, and the IC tag itself has an antenna. Includes both.

  According to the above-described configuration, the IC tag having the antenna function is provided at a position between the adjacent fused portions, that is, at a non-high temperature location that is not a location that is heated by the heating wire. Missing or erasure of records in the IC tag due to fusion, and poor IC tag 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.

  The above-mentioned EF joint may further include a connecting heating wire for connecting the heating heating wires, and the IC tag may be electrically connected to the connecting heating wire.

According to the above-described configuration, when radio waves are irradiated from the outside of the EF joint to the heating heating wire and the connection heating wire including metal or the like, an induction current is generated from these heating wires. An induced current flows through the IC tag 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 power necessary for communication and reading / writing of internal information.
In addition, since the connecting heating wire to which the IC tag can be electrically connected is a non-high-temperature portion, the problem of the IC tag can be prevented as described above.
Furthermore, in the present invention, since the connecting heating wire is disposed between the heating heating wires, the connecting portion of the IC tag with respect to the connecting heating wire is the heating heating wire and the heating heating wire. The length of the heating wire functioning as an antenna (antenna length) can be increased.

In the EF joint described above, the IC tag may be electrically connected to the connecting heating wire via an insulating material.
According to this configuration, when a radio wave is irradiated to the connecting heating wire from the outside of the EF joint, an induction current is generated from the heating heating wire and the connecting heating wire, and the IC tag is interposed via the insulator material. Induction current is transmitted to. Therefore, as described above, the IC tag obtains power necessary for communication and reading / writing of internal information. In addition, through the insulating material, the heat from the energized connecting heating wire is difficult to be transmitted to the IC tag, and the occurrence of missing or erased records in the IC tag, poor IC tag, etc. is improved. This is effective when the amount of heat from the connecting heating wire is relatively large.

  The manufacturing method of the EF joint according to the present invention includes a resin-made joint body having a plurality of receptacles, and a heating heating wire embedded in a fusion portion of the receptacle in contact with the resin pipe fitted in the receptacle. And a heating wire for connection for connecting the heating wires for heating, and a method for producing an electric fusion joint for connecting a plurality of resin tubes by fusing them by heating, the method comprising: A step of winding a heating wire, a step of arranging an IC tag in a state where an antenna function is formed between the adjacent fused portions, and a gap from outside on the core mold around which the heating wire is wound. The method includes a step of fitting a resin molding die and a step of injecting a resin inside the resin molding die.

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

  The manufacturing method of the above-described EF joint further includes a step of arranging the IC tag in an electrically connected state to the connecting heating wire among the heating wires.

  According to the configuration described above, the IC tag is arranged in a state of being electrically connected to the connection heating wire, so that the induction generated from the heating wire even when the IC tag does not have an antenna. Current can be supplied to the IC tag to enable communication of the IC tag and reading / writing of internal information as described above.

  According to the EF joint and the manufacturing method of the EF joint according to the present invention, it is possible to easily read both information to be read before and during fusion and information to be read after fusion. In addition, it is possible to leave information relating to fusion history and adhesion, which has remained only in the conventional fusion machine, in the EF joint.

It is sectional drawing which shows one Embodiment of the EF coupling which concerns on this invention. It is a top view which shows one Embodiment of the EF coupling which concerns on this invention. It is a fragmentary sectional view showing a mode during fusion in one embodiment of an EF joint concerning the present invention. It is a fragmentary sectional view showing a mode during fusion in one embodiment of an EF joint concerning the present invention. It is a fragmentary sectional view showing a situation at the time of completion of fusion in one embodiment of an EF joint concerning the present invention. It is the schematic which shows one Embodiment of the manufacturing method of the EF coupling which concerns on this invention.

  Hereinafter, an embodiment of an EF joint and an EF joint manufacturing method 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, and the like are not necessarily 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 that is connected by fusing at least a plurality (two in FIG. 1 to FIG. 5) of resin pipes 5 and 5 by heating. A resin joint body 2 having a plurality (two in FIGS. 1 to 5) of receiving ports 7 and 7 and embedded in a fusion part M of the receiving port 7 that comes into contact with the resin pipe 5 fitted in each receiving port 7. A heating wire 3h for heating, a connecting heating wire 3x for connecting the heating wires 3h, and an IC tag 20 electrically connected to the connecting heating wire 3x are provided.
The EF joint 1 is a socket, and includes a terminal portion 10 for performing fusion bonding 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 receptacles 7 and 7 for preventing the resin pipes 5 and 5 from colliding with each other and being damaged. The stopper 9 protrudes inward from the inner peripheral surface 2 a of the joint body 2.

On the inner peripheral surface 2a side of the joint body 2, a heating wire 3 such as a nichrome wire is embedded. The heating wire 3 is not particularly limited as long as it includes a 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 contact the inner peripheral surface 2 a of the joint body 2. Then, the heating wire 3 is densely wound mainly at the central portion of one receiving port 7, and is sparsely wound around the connecting portion between the receiving ports 7, 7, and mainly at the central portion of the other receiving port 7. It is tightly wound again.

The fusion part M is a part that can be hotter than the surroundings when the heating wire 3 is tightly wound and the heating wire 3 is energized.
That is, the heating wire 3h is composed of the heating wire 3 that is closely wound mainly in the central portion of the receiving port 7, and when the heating wire 3h is energized, the fusion portion M is formed. Form.
The connecting heating wire 3x is composed of the heating wire 3 that connects the heating heating wires 3h and is wound more sparsely than the heating heating wire 3h. 1 and 2 show an example in which the connecting heating wire 3x is provided in a spiral shape along the axial direction of the joint body 2, it may be provided in a linear shape.

When an IC tag 20 that does not have an antenna built therein is used, or an antenna that has a remarkably short communication distance is built in, it is electrically connected to the connecting heating wire 3x from the outer peripheral surface side. Alternatively, they are non-electrically connected and embedded in the joint body 2. The IC tag 20 uses an induction current from the connection heating wire 3x as an antenna with the heating wire 3x connected to the connection heating wire 3x and the connection heating wire 3x connected electrically or non-electrically as an antenna. 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 the IC tag 20 is in contact with the connection heating wire 3x. However, by providing the IC tag 20 at the center of the connection heating wire 3x, the connection electricity functioning as an antenna of the IC tag 20 is provided. The lengths of the heating wire 3x and the heating heating wire 3h are symmetrical on the left and right of the IC tag 20, and the connecting heating wire 3x and the heating heating wire 3h function as a bilaterally symmetric dipole antenna with the IC tag 20 as the center. To do.
Further, the IC tag 20 may be brought into contact with the connection heating wire 3x at a position where the length from the IC tag 20 to the terminal pin 4 is ¼ of the communication wavelength λ.
In the case where the IC tag 20 has an external antenna or has an internal antenna function, the IC tag 20 is embedded in a joint body near the connection heating wire 3x and is contactlessly used with a reader / writer R or the like. Although it will not specifically limit if it is comprised so that information can be read, It is preferable to embed | buy in a joint main body so that an antenna may become a direction (circumferential direction of a joint main body) orthogonal to the pipe axis of a joint main body.

Specifically, the information stored in advance in the IC tag 20 before the fusion includes the fusion conditions, the production date, the production location, the manufacturer, the resin tube 5 between the resin pipes 5 and 5 and the EF joint 1. , 5 and the connection structure of the EF joint 1 (for example, for water and sewage, for gas, for rental, etc.) and the type of the EF joint 1 (for example, socket, cheese, elbow, etc.). It is not limited to. Such information stored in advance can be read before fusing.
The information written in the IC tag 20 after the fusion includes, for example, information related to piping construction (for example, position information, piping drawing, installation date, installer, type and model number of the fusion machine used, energization / fusion) But not limited to such information.

On the outer peripheral surface 2 b of the joint body 2, a terminal portion 10 for attaching a cable connector of a fusion controller and allowing a current to flow through the heating wire 3 is formed. The terminal portions 10 are respectively provided on the outer peripheral surfaces 2b on both end sides in the direction of the axis O1 of the joint body 2.
The terminal portion 10 includes terminal pins 4 and a connector mounting portion 12.
The terminal pin 4 protrudes 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 protrude radially outward from the outer peripheral surface 2b of the joint body 2 around the terminal pin 4 in the direction orthogonal to the axis O1 so as to surround the terminal pin 4. 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 center axis of each other are coaxially arranged.

As shown in FIG. 1, the outer peripheral surface 2b of the joint body 2 is provided with a concave portion 8 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 concave portion 8 is formed with a substantially columnar indicator 13 that protrudes from the bottom surface 8a of the concave portion 8 toward the outer peripheral surface 2b of the joint body 2 (see FIG. 2).
The indicator 13 informs 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 at the time of 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, and polypropylene resin.

Next, a method for connecting the resin pipes 5 and 5 using the EF joint 1 of the present embodiment will be described.
When the resin pipes 5 and 5 are joined together using the EF joint 1, first, the respective ends of the resin pipes 5 and 5 are fitted into the receiving ports of the joint body 2.

  As shown in FIG. 1, the reader / writer R irradiates the heating wire 3 with radio waves, supplies power to the IC tag 20 with an induction current from the connection heating wire 3x, and uses the EF joint 1 under conditions of use (for example, for water supply, For sewage and gas).

  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. Also in this case, an induction current may be generated from the connection heating wire 3x so as to function as an antenna of the IC tag 20 so that communication, reading and writing can be performed.

  When the heating wire 3 is energized, the heating wire 3h is energized, and the heating wire 3h is heated to generate heat, and as shown in FIG. 3, the fusion part M is hotter than its surroundings. Thus, the resin in the fused part M is melted. Furthermore, as the heating wire 3 continues to be energized, as shown in FIG. 4, the temperature rise of the fusion part M reaches the part of the resin pipe 5 in contact with the fusion part M, and the resin in that part also melts. . On the other hand, since the temperature of the connecting heating wire 3x and the IC tag 20 is lower than that of the fusion part M, information already recorded on the IC tag 20 is protected.

At this time, by providing a fusion machine (not shown) used for fusion with the same function as the reader / writer R, the fusion machine communicates with the IC tag 20, and the fusion conditions are read into the fusion machine. Make it. At this time, as precautions regarding fusion, for example, display of necessary cooling time, display “Please communicate after completion of fusion”, etc., or there is a history of energization or a history of fusion. You may communicate so that it can display that it cannot be worn or used.
Basically, once the EF joint 1 is energized, the state of the resin that has received heat changes, and the bonding strength changes from that before energization, so that energization is impossible. Therefore, the communication is recorded in the IC tag 20 as a history. As a result, when the cable connector C is detached from the terminal pin 4 during the fusion or when the fusion is stopped due to a power shortage or the like, when the EF joint 1 is to be reused by mistake later, As described above, the fact that there is a fusion history is displayed at the start of the fusion, and reuse of the EF joint 1 can be prevented.

As shown in FIG. 5, when the fusion part M and the resin pipe 5 in contact with the fusion part M are fused and integrated, the energization to the heating wire 3 is stopped. The resin pipes 5 and 5 are connected using the EF joint 1 through the above-described steps.
At this time, the fusion machine and the IC tag 20 may be communicated, and the fact that the fusion has been normally completed may be written in the IC tag 20. When the fusion is completed, the fusion machine and the IC tag 20 may be displayed on the fusion machine so as to communicate with each other.

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

  As a communication frequency used for communication with the IC tag 20, an HF band (mainly 13.56 MHz), a microwave band (mainly 2.45 GHz), or the like can be used. In particular, the UHF band (mainly 860 MHz to 960 MHz). ), It is difficult to be affected by water in the pipe, and a communication distance of several meters can be obtained depending on the antenna length, so it is buried several meters away, for example, in the ground or several meters below the road. It is possible to read information from the IC tag 20 and write information to the IC tag 20 from the surface of the EF joint 1 or the EF joint 1 piped on the ceiling.

Next, an embodiment of a method for manufacturing an EF joint according to the present invention will be described.
The manufacturing method of the EF joint of the present embodiment includes a resin joint body 2 having two receiving ports 7, a heating heating wire 3 h embedded in the fusion part M of the receiving ports 7, 7, A heating wire 3h for connection between the heating wires 3h and 3h for heating, and a method of manufacturing the EF joint 1 to be connected by fusing a plurality of resin tubes 5 and 5 by heating, A step of winding the heating wire 3 around the mold 32, a step of arranging the IC tag 20 in an electrically connected state to the connection heating wire 3x of the heating wires 3, and a core mold around which the heating wire 3 is wound. 32, a step of fitting a resin molding die 34 with a gap S from the outside, and a step of injecting resin inside 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 separable along the axial direction is used. Subsequently, the heating wire 3 is wound spirally and continuously along the axial direction of the core mold 32. At this time, as shown in FIG. 6B, the heating wire 3h is wound around 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. A resin molding die 34 having a gate 34g for injecting resin for injection molding is fitted with a gap S from the outside.
Subsequently, the resin P is injected into the inside of the resin molding die 34 and, as shown in FIG. 6E, the resin molding die 34 is removed after completion of the injection molding. Furthermore, as shown in FIG.6 (f), the core metal mold | die 32 is removed from the injection molding body of resin P by separating the core metal mold | die 32 mutually along an axial direction. Thereafter, as shown in FIG. 6 (g), the resin P injected to the gate 34g from the injection molded body of the resin P is cut out, and the EF joint 1 is obtained as shown in FIG. 6 (h). In addition, the figure from FIG.6 (e) to FIG.6 (h) is shown in the state reversed right and left on the paper surface with respect to the figure from FIG.6 (a) to FIG.6 (d).

  According to the EF joint 1 of the present embodiment described above, since the IC tag 20 is provided between the fusion parts M, that is, at a non-high temperature location, the missing or erased record of the IC tag 20 due to fusion. This makes it difficult for the IC tag 20 to malfunction. Therefore, for example, if communication is performed before fusion using a non-contact type reader / writer R or the like, the fusion condition and use condition of the EF joint 1 can be confirmed. At the start of energization / fusion, it is possible to read the fusion conditions by communicating with the fusion machine, to display notes on fusion on the fusion machine, or to write a fusion history. When the fusion is completed, it can be written that the fusion has been completed normally. In addition, construction information or the like can be written in the IC tag 20.

  In addition, according to the EF joint 1 of the present embodiment, when the heating heating wire 3h and the connecting heating wire 3x having conductivity are irradiated with radio waves from the outside of the EF joint 1, an induction current is generated from these heating wires. And an induced current can be supplied to the IC tag electrically connected to the connecting heating wire. Thus, the IC tag 20 can be easily put into a state where communication and internal information can be read / written using the connection heating wire 3x as an antenna.

  Therefore, according to the EF joint 1 of the present embodiment, at least both information to be read before fusion or at the start of energization / fusion and information to be read after fusion can be easily read. Thereby, work efficiency, such as construction of the connection structure of the resin pipe 5 and the EF joint 1, can also be improved.

  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 disposed and electrically connected to the connecting heating wire 3x. Therefore, as described above, the EF joint 1 that can easily read information to be read before and during fusion and information to be read after fusion from the IC tag 20 using the reader / writer R or the like is manufactured, and the IC at high temperature It is possible to prevent damage to the tag 20 and loss of internal information.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments, and various modifications are possible within the scope of the gist of the present invention described in the claims. Deformation / change is possible.

  For example, if the IC tag 20 is electrically connected to the connecting heating wire 3x and embedded in a portion other than the fusion portion M in the joint body 2, it is not necessary to be in contact with the connecting heating wire 3x. Instead, it may be bonded to the connecting heating wire 3x by an adhesive having conductivity, 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 insulating material (not shown). In other words, the IC tag 20 may be arranged so as to be able to receive an induced current from the connecting heating wire 3x via an insulating material. Examples of such an insulator material include, but are not limited to, polybutene resin, high density polyethylene resin, medium density polyethylene resin, and polypropylene resin.

  Further, when the IC tag 20 has an antenna built therein or when the IC tag 20 can be connected to the connection heating wire 3x in a non-contact state by capacitive coupling or the like, the IC tag 20 and the connection power supply are connected. The heat wire 3x may not be electrically connected.

  For example, in the case of the IC tag 20 incorporating the antenna, the reader / writer R or the like is used so that information can be read out from the outside of the EF joint 1 in a non-contact manner such as the ground surface. Examples of such an IC tag 20 include a so-called RFID element.

  Further, as an IC tag 20 different from the above-described embodiment in which no antenna is built in, an electromagnetic coupling module described in, for example, Japanese Patent No. 4746638 can be cited. The electromagnetic coupling module includes a wireless IC chip and a power supply circuit board that includes the wireless IC chip and includes 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. 4746638 can be cited.

  Further, for example, in the above-described embodiment, the joint body 2 is described as the socket as the EF joint 1, but the type and shape of the joint body 2 are not particularly limited as long as the joint body 2 has a plurality of receiving ports 7. For example, an elbow, a reducer, cheese, etc. may be sufficient.

  Furthermore, when using the joint body 2 having two receptacles 7 and 7 such as sockets and elbows and one connector mounting portion 12 (so-called terminal) in each receptacle, a connecting heating wire 3x is provided. Therefore, it may be configured as shown in FIG. However, when there are two connector mounting portions at each receptacle, or when a joint body having three receptacles is used, for example, the energization to the heating wire is completed at each receptacle and the connection 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 the built-in antenna as described above.

  Furthermore, in the above-described embodiment, one IC tag 20 is provided at a position (position of the connecting heating wire 3x) between the two fusion portions (positions where the heating heating wire 3h is disposed). 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 parts, an IC tag can be disposed between adjacent fusion parts, and two IC tags are provided in one EF joint. Become.

  Furthermore, a bar code 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, it is possible to perform fusion welding even when only an old-style controller having no contactless reader / writer function is prepared.

Furthermore, 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, and radio waves having a wavelength in the HF band are transmitted. You may communicate with the IC tag 20 in an EF coupling. Depending on the construction site, different types of EF joints may be close to each other. If communication is performed using a reader / writer in the UHF band, there is a possibility of communicating with the next 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, etc. May be read.
Furthermore, the radio wave output of the reader / writer R of the controller may be reduced so as to communicate only with the target EF joint 1 and not be mixed with other adjacent EF joints 1.

DESCRIPTION OF SYMBOLS 1 ... EF joint (electric fusion joint), 2 ... Joint body, 3 ... Heating wire, 3h ... Heating wire for heating, 3x ... Heating wire for connection, 20 ... IC tag, 32 ... Core mold, 34 ... Resin Mold for molding

Claims (5)

An electric fusion joint for connecting a plurality of resin tubes by fusing by heating,
A resin joint body having a plurality of receptacles;
A heating wire embedded in a fusion part of the receptacle that contacts the resin pipe fitted in the receptacle;
An IC tag embedded between adjacent fused parts and having an antenna function;
An electric fusion joint comprising: A heating wire for connecting the heating wires for heating,
The electrofusion joint according to claim 1, wherein the IC tag is electrically connected to the connection heating wire.   The electrofusion joint according to claim 1, wherein the IC tag is electrically connected to the connection heating wire via an insulating material. A resin-made joint body having a plurality of receiving ports, a heating heating wire embedded in a fused portion of the receiving port that contacts the resin pipe fitted in the receiving port, and the heating heating wires connected to each other A heating wire for connection, and a method of manufacturing an electric fusion joint to be connected by fusing a plurality of resin tubes by heating,
Winding the heating wire around the core mold;
Placing an IC tag in a state in which an antenna function is formed between the adjacent fused portions;
A step of fitting a mold for resin molding with a gap from the outside to the core mold around which the heating wire is wound;
Injecting resin inside the resin mold,
A process for producing an electrofusion joint, comprising:   A method for producing an electrofusion joint, comprising: placing the IC tag in an electrically connected state to the connecting heating wire among the heating wires.

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