JPH0743067B2 - Electrofusion joint defect display method - Google Patents

Electrofusion joint defect display method

Info

Publication number
JPH0743067B2
JPH0743067B2 JP62334885A JP33488587A JPH0743067B2 JP H0743067 B2 JPH0743067 B2 JP H0743067B2 JP 62334885 A JP62334885 A JP 62334885A JP 33488587 A JP33488587 A JP 33488587A JP H0743067 B2 JPH0743067 B2 JP H0743067B2
Authority
JP
Japan
Prior art keywords
heating wire
fusion
joint
resistance value
displaying
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP62334885A
Other languages
Japanese (ja)
Other versions
JPH01266393A (en
Inventor
和憲 水戸
尚武 宇田
正弘 平田
Original Assignee
三井石油化学工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三井石油化学工業株式会社 filed Critical 三井石油化学工業株式会社
Priority to JP62334885A priority Critical patent/JPH0743067B2/en
Publication of JPH01266393A publication Critical patent/JPH01266393A/en
Publication of JPH0743067B2 publication Critical patent/JPH0743067B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91214—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods by measuring the electrical resistance of a resistive element belonging to one of the parts to be welded, said element acting, e.g. as a thermistor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9131—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux
    • B29C66/91311—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating
    • B29C66/91317—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating by measuring the electrical resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/967—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving special data inputs or special data outputs, e.g. for monitoring purposes
    • B29C66/9672—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving special data inputs or special data outputs, e.g. for monitoring purposes involving special data inputs, e.g. involving barcodes, RFID tags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/959—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables
    • B29C66/9592—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 characterised by specific values or ranges of said specific variables in explicit relation to another variable, e.g. X-Y diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Description

【発明の詳細な説明】 産業上の利用分野 本発明はプラスチック管を連結するのに使用され、管と
の接触面に電熱線を埋設したエレクトロフュージョン継
手の不良若しくは融着不良を検出し、それを表示する方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for connecting plastic pipes, and detects defects or defective fusion of an electrofusion joint in which a heating wire is embedded in a contact surface with the pipe, Regarding how to display.

従来技術 上下水道管やガス管などに使用されるプラスチック管の
管継手やサドル継手として近年開発されたものにエレク
トロフュージョン継手がある。この継手は、管との接触
面に電熱線を埋設した成形品よりなっており、管との融
着は、管継手の場合、継手の両側より管を嵌挿後、サド
ル継手の場合には、管に側方より押付けた状態で通電し
て接触面を加熱溶融することにより行うようになってい
る。こうした継手に通電される電力量はプラスチック管
の連結部分の品質に影響を与え、電力量が多過ぎると過
熱され、継手ことにパイプが変形するおそれがあり、逆
に少過ぎると過熱が不十分となり、融着強度が低下す
る。継手に通電する装置は従来手作業によって操作さ
れ、通電される電力量は現場での作業者の判断により、
すなわち作業者が融着時における継手の外観より判断し
て決定していたが、近年、継手のサイズや種類に応じて
予め付与される電力量を設定しておき、作業者が継手の
外観によりその種類を識別してそれに対応する電力量を
決定する方式が採用され始めてきた。また最近管継手に
関し、継手の種類に応じて抵抗値の異なる抵抗器を電熱
線とは別に埋込んでおいて検査用電流を流すことにより
その抵抗値を検出する方法、電熱線自体の抵抗値を検出
して管継手の種類を識別し、それに相当する電力量の付
与を行う方法、継手と一体に設けたコーディング・タブ
のパターンを読取って通電時間を求める方法（特開昭61
−175022号）なども提案されている。2. Description of the Related Art Electrofusion joints have been recently developed as pipe joints and saddle joints for plastic pipes used for water and sewer pipes and gas pipes. This joint consists of a molded product in which the heating wire is buried in the contact surface with the pipe.For fusion with the pipe, in the case of a pipe joint, after inserting the pipe from both sides of the joint, in the case of a saddle joint, , The tube is pressed from the side to energize to heat and melt the contact surface. The amount of electric power supplied to these joints affects the quality of the connected part of the plastic pipe, and if the amount of electric power is too much, it may overheat, and the pipe may be deformed at the joint. And the fusion strength decreases. The device that energizes the joint is conventionally operated manually, and the amount of electricity energized depends on the judgment of the operator at the site.
That is, the operator decided by judging from the appearance of the joint at the time of fusion, but in recent years, the amount of electric power given in advance has been set according to the size and type of the joint, and A method of identifying the type and determining the corresponding amount of electric power has begun to be adopted. Regarding pipe fittings recently, a method of detecting the resistance value by embedding a resistor with a different resistance value according to the type of fitting separately from the heating wire and sending an inspection current, the resistance value of the heating wire itself Is detected to identify the type of pipe joint and the amount of electric power corresponding thereto is applied, and the pattern of the coding tab provided integrally with the joint is read to determine the energization time (JP-A-61
-175022) is also proposed.

発明が解決しようとする問題点 継手に埋込まれる抵抗器や電熱線の抵抗値を検出する方
法或いは継手に設けたコーディング・タブのパターンを
読取る方法によれば、コード先端に取付けたプラグ、ジ
ャック或いはコネクター等（以下単にコネクター等とい
う）を差込口やタブに差込むだけで継手の種類や通電時
間に関するデータを求めることができ、それに基づいて
所定の電力量を自動的に付与することが可能となるが、
なおつぎのような問題点がある。すなわちコネクター等
が差込まれる継手の差込み口やタブ或いはコネクター等
が汚れていると、コネクター等の接触抵抗により検出さ
れる抵抗値が抵抗器や電熱線自体のものと異なり、その
ため過大な或いは過少な電力量が付与されるようになる
ことである。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention According to a method of detecting a resistance value of a resistor or a heating wire embedded in a joint or a method of reading a pattern of a coding tab provided in the joint, a plug or a jack attached to a tip of a cord is used. Alternatively, by simply inserting a connector, etc. (hereinafter simply referred to as a connector, etc.) into the insertion port or tab, it is possible to obtain data regarding the type of joint and the energization time, and based on that, a predetermined amount of power can be automatically given. It will be possible,
There are the following problems. In other words, if the insertion opening of the joint into which the connector or the like is inserted, or the tab or connector is dirty, the resistance value detected by the contact resistance of the connector or the like differs from that of the resistor or heating wire itself. That is, a large amount of electric power is given.

第一の発明は、抵抗値の異常を検出して上記のような問
題、すなわち過大若しくは過少の電力量が付与されるこ
とのないようにしたものである。A first aspect of the present invention detects an abnormality in a resistance value so as to prevent the above problem, that is, an excessive or insufficient electric energy from being applied.

問題点の解決手段 すなわち第一の発明は、プラスチック管を連結するのに
使用され、管との接触面に電熱線を埋設し、管との融着
が電熱線に所定の電力量を付与して接触面を加熱溶融す
ることにより行われるエレクトロフュージョン継手にお
いて、継手に抵抗値に関するデータを記録した表示手段
を設けるとともにコネクター等に上記表示手段を読取る
センサーを設け、上記コネクター等を継手の差込み口に
或いは差込み口と別個に設けたタブに差込む際、センサ
ーで表示手段より読取った抵抗値と電熱線より測定した
コネクター等の接触抵抗を含む抵抗値とを照合し、両者
の差が許容範囲を越えるとき異常を表示するようにした
ものである。Means for Solving the Problems That is, the first invention is used for connecting plastic pipes, a heating wire is embedded in the contact surface with the pipe, and fusion with the pipe gives a predetermined amount of power to the heating wire. In the electrofusion joint that is performed by heating and melting the contact surface, the joint is provided with a display means for recording data regarding the resistance value and the connector or the like is provided with a sensor for reading the display means, and the connector or the like is connected to the joint insertion port. Or when inserting into a tab provided separately from the insertion port, the resistance value read from the display means by the sensor is compared with the resistance value including the contact resistance of the connector etc. measured from the heating wire, and the difference between the two is within the allowable range. It is designed to display an abnormality when the value exceeds.

ここで表示手段とは例えば、バーコード、磁気テープ或
いは磁片、孔、突起などからなり、磁片、孔、突起など
の場合には、その数或いは高さ、深さ、長さ等のサイズ
によい抵抗値が表示されるが、これらのなかでは孔や突
起によるものが望ましい。継手の成形時に同時に形成す
ることができるため表示手段のための部品を新たに設け
る必要がなく、また後行程も必要がなくなり経済的であ
るからである。Here, the display means is, for example, a bar code, a magnetic tape or a magnetic piece, a hole, a protrusion, or the like. In the case of a magnetic piece, a hole, a protrusion, or the like, the number or the size such as height, depth, or length. A good resistance value is displayed, but among these, holes and protrusions are preferable. This is because it can be formed simultaneously with the molding of the joint, so that it is not necessary to newly provide a part for the display means, and a subsequent process is not necessary, which is economical.

作用 コネクター等の差込み時、センサーが表示手段より読取
ったデータより抵抗値が求められる。そして検査用電流
を流して電熱線より測定したコネクター等の接触抵抗を
含む抵抗値と比較照合され、その差が許容範囲を越える
と異常表示がされ、範囲内にあると通電用のスイッチが
入れられ所定の電力量が付与される。Operation When the connector or the like is inserted, the resistance value is obtained from the data read by the sensor from the display means. Then, the current for inspection is passed and the resistance value including the contact resistance of the connector etc. measured from the heating wire is compared and collated.If the difference exceeds the allowable range, an error is displayed, and if it is within the range, the power switch is turned on. And a predetermined amount of power is given.

発明が解決しよとする問題点 エレクトロフュージョン継手による融着時、適正な融着
を行うためには全体を均一に加熱することが望まれる
が、融着時に樹脂が溶融状態となる際、往々にして電熱
線同志が互いに接触して短絡し、局部的に加熱したり加
熱不足を来し、適正な融着が行われなくなることがあ
る。電熱線の短絡は電流値の上昇となって表われ、加熱
は低下となって表われるから通電中の電流値を測定する
ことにより電熱線の短絡や過熱を発見することができる
と考えられるが、例えばコイル状に数十回巻かれた電熱
線の場合、そのうちの二、三ケ所が短絡したとしても電
流値の増加は、許容範囲に収まる程度の僅かなものであ
り、短絡を見付け出すことは実質的に困難である。過熱
に関しても、電流値の減少が許容範囲を越えるまでは見
付け出すことが困難で、見付け出したときには過熱が進
み、樹脂の劣化をもたらすことが多い。Problems to be Solved by the Invention At the time of fusion by an electrofusion joint, it is desired to uniformly heat the whole in order to perform proper fusion, but when the resin is in a molten state at the time of fusion, it is often the case. In some cases, the heating wires come into contact with each other and are short-circuited, resulting in local heating or insufficient heating, which prevents proper fusion. A short circuit of the heating wire appears as an increase in the current value, and heating appears as a decrease.Therefore, it is considered possible to detect a short circuit or overheating of the heating wire by measuring the current value during energization. For example, in the case of a heating wire wound dozens of times in a coil, even if a few of them are short-circuited, the increase in current value is a small amount that falls within the allowable range. Is practically difficult. Regarding overheating, it is difficult to find out until the decrease of the current value exceeds the allowable range, and when it is found, overheating progresses, often resulting in deterioration of the resin.

第二の本発明の目的は、電熱線の短絡や過熱などの融着
が適正に行われていないときにそれを早期に適格に見付
け出し、融着不良を表示させることにある。A second object of the present invention is to find out a short-circuit or overheating of a heating wire when it is not properly fused, to find it early and to display a defective fusion.

問題点の解決手段 第二の発明はそのため、プラスチック管を連結するのに
使用され、管との接触面に電熱線を埋設し、管との融着
が電熱線に所定の電力量を付与して接触面を加熱溶融す
ることにより行われるエレクトロフュージョン継手にお
いて、通電時における電流、電圧、電気抵抗の電気特性
のうち、一つ以上の電気特性を通電期間中感知して変化
の速度或いは加速度を演算し、変化の速度或いは加速度
が許容範囲を越えたとき融着不良を表示させるようにし
たものである。Solution to Problem The second invention is therefore used for connecting plastic pipes, in which the heating wire is embedded in the contact surface with the pipe, and the fusion with the pipe gives the heating wire a predetermined amount of power. In the electrofusion joint that is performed by heating and melting the contact surface, at least one of the electrical characteristics of current, voltage, and electrical resistance during energization is sensed during the energization period to detect the speed or acceleration of change. The calculation is performed so that the fusion defect is displayed when the speed of change or the acceleration exceeds the allowable range.

融着不良の表示は、警報音、警報ランプの点灯等によっ
て行われる。なお融着不良が生じたときそれを表示する
だけでもよいが、好ましくは表示とともに通電回路のス
イッチが自動的に切られ、通電が停止するようにされ
る。The display of the fusion failure is performed by an alarm sound, lighting of an alarm lamp, or the like. It should be noted that when a fusion failure occurs, it may be displayed only, but preferably the display circuit is automatically turned off together with the display so that the power supply is stopped.

作用 電熱線の抵抗値は温度が上昇するに従って大きくなり、
温度とは一般に次の関係がある。Action The resistance value of the heating wire increases as the temperature rises,
The following relationship is generally found with temperature.

Ｒ＝R0（１＋αｔ） ここで Ｒ :t℃における抵抗 R0 :0℃における抵抗 α ：抵抗温度係数 通電を開始し、加熱が進行するとともに温度が上昇す
る。その結果、上式で示すように、時間の経過とともに
電熱線の抵抗が次第に大きくなり、逆に電熱線を流れる
電流は次第に小さくなる。R = R 0 (1 + αt) Here, R: resistance at t ° C. R 0 : resistance at 0 ° C. α: temperature coefficient of resistance The energization is started, and the temperature rises as heating progresses. As a result, as shown by the above equation, the resistance of the heating wire gradually increases with the passage of time, and conversely the current flowing through the heating wire gradually decreases.

第2A図は通電時における電流曲線を示すもので、実線で
示すように、電流値は当初急に低下するが、次第に低下
が少くなり、各接線の傾きも次第に緩やかになる。接線
の傾きの差を示すθは、時間当たりの電流変化速度の
差、すなわち電流変化の加速度を示す。例えば、図のθ
１はt0時における電流低下（変化）速度とt1時における
電流低下速度の差をt1−t0時間で除いしたものであり、
同様にθ１はt2時とt1時の間の電流低下の速度差をt2−
t1時間で除したものである。FIG. 2A shows a current curve during energization. As shown by the solid line, the current value suddenly decreases at first, but gradually decreases, and the slope of each tangent line also gradually decreases. Θ, which represents the difference in the tangent slope, represents the difference in the rate of change in current over time, that is, the acceleration in change in current. For example, θ in the figure
1 is obtained by excluding the difference in the current reduction rate at a current decrease (change) the rate and t 1:00 in time t 0 at t 1 -t 0 hour,
Similarly, θ 1 is the difference in speed of current decrease between t 2 and t 1 at t 2 −
t is divided by 1 hour.

いま通電後、t3時間経過したときに電熱線の短絡による
異常が生じたとする。そのとき電流が点線で示すように
上昇し始める。電流の上昇量は僅かであっても異常発生
時点での接線の傾きは、それまでの下向きから反転して
急に上向きとなり、接線の傾きの差、図でいえばθ３、
すなわちt2時とt0時の間の速度差をt3−t0時間で除した
加速度は設定された許容範囲を越える程急激に大きくな
り、そのため短絡による異常を容易に感知することがで
きるようになる（異常が感知されると表示される）。電
流が急激に下がり始めたときにも（こうした原因として
過熱が考えられる）、その接線傾きとt4時における接線
の傾きの差θ４が許容範囲を越える程大きくなると異常
が感知され表示される。It is assumed that an abnormality has occurred due to a short circuit in the heating wire when t 3 hours have passed after energization. Then the current begins to rise as shown by the dotted line. Even if the amount of increase in current is small, the slope of the tangent line at the time of occurrence of an abnormality reverses from the downward direction up to then and suddenly rises, and the difference in the slope of the tangent line, θ 3 in the figure,
That is, the acceleration obtained by dividing the speed difference between t 2 and t 0 by t 3 −t 0 time becomes so large that it exceeds the set permissible range.Therefore, it is possible to easily detect an abnormality due to a short circuit. (Displayed when an abnormality is detected). Even when the current suddenly starts to fall (overheating may be the cause), if the difference θ 4 between the tangent line inclination and the tangent line inclination at t 4 becomes large enough to exceed the allowable range, an abnormality is detected and displayed. .

第2B図は時間当りのθ、すなわち加速度の変化を示すも
ので、異常が発生してθが急激に変化したとき許容範囲
を越えるパルスのような波形が生じ、これより異常が発
生したときの検出が容易に行えるようになる。Figure 2B shows the change in θ, that is, the change in acceleration per unit time. When an abnormality occurs and abruptly changes θ, a pulse-like waveform that exceeds the allowable range is generated. The detection can be easily performed.

実施例 管継手１には内側にコイル状に巻かれた電熱線２が埋設
され、各端子３が管継手１の両側より突出している。そ
してコントローラ４側のコネクターが係脱可能に繋がれ
るようになっている。第１図は繋がれたときの状態を示
す。コントローラ４はコンピュータ５を備えており、コ
ントローラ側のコネクターを継手側の端子に繋いだと
き、センサー６が継手側に設けた記録板７から電熱線２
の抵抗値、通電時の電圧その他通電時に必要なデータを
読取ってコンピュータ５に入力し、それに基づいてコン
ピュータ５が通電時間及び電圧を決定するようになって
いる。センサー６が通電用のデータを読取るのと並行し
て弱い検査用の直流電流がコネクターを通して電熱線２
に流され（このときスイッチＢは閉じられている）、コ
ネクターの接触抵抗を含む電熱線３の抵抗値が抵抗セン
サー８によって計測され、コンピュータ５に入力され
る。そしてセンサー６で読取った抵抗値と抵抗センサー
８で計測された抵抗値とが比較照合され、検出した抵抗
値が許容範囲を越えれば、表示９に不良表示が、許容範
囲内にあれば適表示される。適表示と同時にまたスイッ
チＢが切れられるとともにスイッチＡが入れられ、電圧
が電圧調整器11で調整され、決められた時間通電され
る。通電中は電流センサー12が電流を計測しつゞけ、コ
ンピュータ５に入力する。コンピュータ５はこれにより
電流値の変化の速度或いは加速度を演算し、これらが電
熱線２の短絡や異常加熱により許容範囲を越えると異常
表示を行うとともにスイッチＡを切り通電を停止する。Example A heating wire 2 wound in a coil shape is embedded in the pipe joint 1 and each terminal 3 projects from both sides of the pipe joint 1. The connector on the controller 4 side is detachably connected. FIG. 1 shows the state when they are connected. The controller 4 is provided with a computer 5, and when the connector on the controller side is connected to the terminal on the joint side, the sensor 6 connects the recording plate 7 provided on the joint side to the heating wire 2
The resistance value, the voltage during energization, and other data necessary during energization are read and input to the computer 5, and the computer 5 determines the energization time and voltage based on the data. In parallel with the sensor 6 reading data for energization, a weak DC current for inspection passes through the connector to the heating wire 2
(The switch B is closed at this time), and the resistance value of the heating wire 3 including the contact resistance of the connector is measured by the resistance sensor 8 and input to the computer 5. Then, the resistance value read by the sensor 6 and the resistance value measured by the resistance sensor 8 are compared and collated. If the detected resistance value exceeds the allowable range, a defective display is displayed on the display 9, and if it is within the allowable range, an appropriate display is made. To be done. Simultaneously with the appropriate display, the switch B is turned off and the switch A is turned on, the voltage is adjusted by the voltage regulator 11, and the power is supplied for a predetermined time. The current sensor 12 measures the current while it is energized and inputs it to the computer 5. The computer 5 thereby calculates the speed or acceleration of the change in the current value, and when these exceed the allowable range due to a short circuit of the heating wire 2 or abnormal heating, an error is displayed and the switch A is turned off to stop energization.

以上は管継手の例について述べたが、サドル継手の場合
も同様に継手の不良表示や融着不良を表示することがで
きる。Although the example of the pipe joint has been described above, in the case of the saddle joint, the joint failure display and the fusion welding failure can be similarly displayed.

上記実施例では、継手に通電時に必要な通電時間や電圧
などのデータが取込まれ、センサーがこれを読取る方式
のものについて適用されるようになっているが、従前の
ものと同様、継手に埋込んた抵抗器から或いは継手のサ
イズや種類、抵抗値、通電時間等を表示する識別機構、
例えばサイズや数の異なる孔、突起、磁片、バーコー
ド、磁気テープなどからセンサーによってその継手に関
するデータを得、それに基づいて通電時間更には電流乃
至電圧を決定する方式のものについても同様にして適用
することができる。In the above embodiment, data such as energization time and voltage necessary for energizing the joint are taken in, and the sensor is adapted to read the data. An identification mechanism that displays the size and type of joint, the resistance value, the energization time, etc. from the embedded resistor,
For example, the data of the joint is obtained by sensors from holes, protrusions, magnetic pieces, barcodes, magnetic tapes, etc. of different sizes and numbers, and the same applies to the method of determining the energizing time and the current or voltage based on the data. Can be applied.

また上記実施例では通電時の異常を電流によって感知す
るようになっているが、抵抗など他の電気特性によって
感知することもできる。Further, in the above embodiment, the abnormality at the time of energization is detected by the electric current, but it can be detected by other electric characteristics such as resistance.

発明の効果 第一の発明は以上のように、電熱線に検査用電流を流し
て求めた抵抗値を継手の表示手段から読取った抵抗値と
比較照合して異常を検出し、それを表示するようにした
もので、異常値に基づいて過大若しくは過少な電力量が
付与されるのを解消することができ、連結部分の品質低
下を防止することができる。Effect of the Invention As described above, the first invention compares the resistance value obtained by passing the inspection current through the heating wire with the resistance value read from the display means of the joint, detects an abnormality, and displays it. With this configuration, it is possible to prevent the excessive or insufficient amount of electric power from being given based on the abnormal value, and it is possible to prevent deterioration of the quality of the connected portion.

第二の発明によれば、通電中における電熱線の短絡や過
熱による融着不良を早期のうちに確実に知ることができ
る。According to the second aspect of the present invention, it is possible to surely know, at an early stage, a fusion defect due to a short circuit or overheating of the heating wire during energization.

【図面の簡単な説明】[Brief description of drawings]

第１図はコントローラの機構図、第2A、2B図は通電時の
作用説明図である。 １……管継手、２……電熱線、３……端子 ４……コントローラ、５……コンピュータFIG. 1 is a mechanical view of the controller, and FIGS. 2A and 2B are operation explanatory views when energized. 1 ... Pipe joint, 2 ... Heating wire, 3 ... Terminal 4 ... Controller, 5 ... Computer

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】プラスチック管を連結するのに使用され、
管との接触面に電熱線を埋設し、管との融着が電熱線に
所定の電力量を付与して接触面を加熱溶融することによ
り行われるエレクトロフュージョン継手において、継手
に抵抗値に関するデータを記録した表示手段を設けると
ともにプラグ、ジャック或いはコネクター等に上記表示
手段を読取るセンサーを設け、上記プラグ、ジャック或
いはコネクター等の差込み時、センサーで表示手段より
読取った抵抗値と電熱線より測定したプラグ、ジャック
或いはコネクター等の接触抵抗を含む抵抗値とを照合
し、両者の差が許容範囲を越えるとき異常を表示するよ
うにしたことを特徴とするエレクトロフュージョン継手
の不良を表示する方法1. Used to connect plastic pipes,
In the electrofusion joint where the heating wire is embedded in the contact surface with the tube and the fusion with the tube is performed by heating and melting the contact surface by applying a predetermined amount of electric power to the heating wire, data regarding the resistance value of the joint. In addition to providing a display means for recording the above, a sensor for reading the display means is provided in a plug, a jack, a connector, or the like, and when the plug, jack, connector, or the like is inserted, the resistance value read from the display means by the sensor and the heating wire were measured. A method of displaying a defect in an electrofusion joint, which is characterized by displaying an abnormality when the resistance value including the contact resistance of a plug, a jack, a connector, or the like is compared and the difference between the two exceeds an allowable range. 【請求項２】表示手段は継手の成形時に同時に形成する
ことができる孔、若しくは突起である特許請求の範囲第
１項記載のエレクトロフュージョン継手の不良を表示す
る方法2. A method for displaying a defect in an electrofusion joint according to claim 1, wherein the display means is a hole or a protrusion that can be formed simultaneously when the joint is molded. 【請求項３】プラスチック管を連結するのに使用され、
管との接触面に電熱線を埋設し、管との融着が電熱線に
所定の電力量を付与して接触面を過熱溶融することによ
り行われるエレクトロフュージョン継手において、通電
時における電流、電圧、電気抵抗の電気特性のうち、一
つ以上の電気特性を通電期間中感知して変化の速度或い
は加速度を演算し、変化の速度或いは加速度が許容範囲
を越えたとき融着不良を表示させるようにしたことを特
徴とするエレクトロフュージョン継手の融着不良を表示
する方法3. Used to connect plastic pipes,
By embedding a heating wire in the contact surface with the tube, fusion with the tube is carried out by applying a predetermined amount of power to the heating wire and overheating and melting the contact surface, current at the time of energization, voltage , One or more of the electrical characteristics of the electrical resistance are sensed during the energization period to calculate the speed or acceleration of change, and display the fusion failure when the speed or acceleration of change exceeds the allowable range. For displaying defective fusion of an electrofusion joint characterized by 【請求項４】融着不良の表示とともに通電回路のスイッ
チＡが切られる特許請求の範囲第３項記載のエレクトロ
フュージョン継手の融着不良を表示する方法4. A method for displaying a fusion defect of an electrofusion joint according to claim 3, wherein the switch A of the energizing circuit is turned off together with the indication of the fusion defect.
JP62334885A 1987-12-28 1987-12-28 Electrofusion joint defect display method Expired - Lifetime JPH0743067B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62334885A JPH0743067B2 (en) 1987-12-28 1987-12-28 Electrofusion joint defect display method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62334885A JPH0743067B2 (en) 1987-12-28 1987-12-28 Electrofusion joint defect display method

Publications (2)

Publication Number Publication Date
JPH01266393A JPH01266393A (en) 1989-10-24
JPH0743067B2 true JPH0743067B2 (en) 1995-05-15

Family

ID=18282314

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62334885A Expired - Lifetime JPH0743067B2 (en) 1987-12-28 1987-12-28 Electrofusion joint defect display method

Country Status (1)

Country Link
JP (1) JPH0743067B2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10240854A (en) * 1997-02-25 1998-09-11 Sekisui Chem Co Ltd Product inspecting device for fusion splicing joint with bar code label
JP3796047B2 (en) * 1998-04-10 2006-07-12 三井化学株式会社 Method and apparatus for electrofusion of electrofusion joint
JP2002299729A (en) * 2001-03-30 2002-10-11 Fujitsu Ltd Method for manufacturing magnetoresistance effect read element
JP4558023B2 (en) * 2007-09-28 2010-10-06 三井化学産資株式会社 Electric fusion method
JP2008209008A (en) * 2008-06-06 2008-09-11 Hitachi Metals Ltd Electrofusion joint
JP2009068717A (en) * 2008-12-22 2009-04-02 Hitachi Metals Ltd Controller for electric welding, and its current-carrying control method

Also Published As

Publication number Publication date
JPH01266393A (en) 1989-10-24

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