DE2716055A1 - ELECTRICAL DEVICE FOR METERED ENERGY DELIVERY IN JOULE'S HEAT WELDABLE THERMOPLASTIC PIPING PARTS - Google Patents

ELECTRICAL DEVICE FOR METERED ENERGY DELIVERY IN JOULE'S HEAT WELDABLE THERMOPLASTIC PIPING PARTS

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Publication number
DE2716055A1
DE2716055A1 DE19772716055 DE2716055A DE2716055A1 DE 2716055 A1 DE2716055 A1 DE 2716055A1 DE 19772716055 DE19772716055 DE 19772716055 DE 2716055 A DE2716055 A DE 2716055A DE 2716055 A1 DE2716055 A1 DE 2716055A1
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Prior art keywords
welding
electrical device
time
value
current
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DE19772716055
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German (de)
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DE2716055C2 (en
Inventor
Ernst Rueede
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ROLLMAPLAST AG
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ROLLMAPLAST AG
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Priority to DE2716055A priority Critical patent/DE2716055C2/en
Priority to FR7711029A priority patent/FR2387110A1/en
Publication of DE2716055A1 publication Critical patent/DE2716055A1/en
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Publication of DE2716055C2 publication Critical patent/DE2716055C2/en
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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"
    • 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
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
    • 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
    • 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/66—Regulating electric power
    • 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
    • B29C66/91—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
    • B29C66/91653—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 by controlling or regulating the voltage, i.e. the electric potential difference or electric tension
    • 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
    • B29C66/91655—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 by controlling or regulating the current intensity
    • 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
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time

Description

Elektrisches Gerät für dosierte Energieabgabe an mit Joule'scherElectrical device for metered energy delivery to with Joule'scher

Wärme schweissbare thermoplastische Rohrleitungsteile.Heat-weldable thermoplastic pipeline parts.

Das Verbinden von Rohrleitungsteilen aus schweissbarem thermoplastischem Material durch Beschicken eines zwischen den Verbindungsteilen liegenden metallischen Widerstandes mit elektrischem Strom ist eine seit Jahren bewährte Technik. Als Hilfsmittel sind verschiedene Typen von Energiedosiergeräten entwickelt worden, welche die Schweissleistung und die Schweisszeit auf die jeweiligen Bedürfnisse abzustimmen erlauben. Die Leistungseinstellung richtet sich nach der Art und Grösse der zu verschweissenden Verbindung und wirkt sich über den Energiebedarf auf die Schweisszeit aus. Da Schweissoperationen instationäre Wärmevorgänge sind, besteht zwischen Schweisszeit und Energiebedarf ein Zusammenhang. Deshalb kann für Verbindungen gleichen Typs und gleicher Grösse selbst bei thermisch identischen Ausgangs- und Umgebungsbedingungen nur dann ein konstanter Energiebedarf vorausgesetzt werden, wenn stets mit mindestens annähernd gleicher Leistung geschweisst wird. Eine Energiedosierung ohne gleichzeitige Leistungsstabilisierung bedeutet daher entweder Verzicht auf eine qualitativ anspruchsvolle Regulierung oder Inkaufnahme eines zusätzlichen, regeltechnisch nur schwer erfassbaren Schweissparameters. Unter diesen Gesichtspunkten war es naheliegend, als Problemlösung eine möglichst präzise leistungsmässige und zeitliche Einhaltung entsprechender Sollwerte anzustreben. Die Erfahrung zeigt jedoch, dass es eines relativ hohen technischen Aufwandes bedarf, um die in diesem Zusammenhang notwendige Genauigkeit der Leistungssteuerung gewährleisten zu können. Dazu kommt, dass in der Praxis umso eher mit dem Auftreten regeltechnischer Unzulänglichkeiten zu rechnen ist, je schmäler der tolerierbare Arbeitsspielraum ist. Der Aufwand für eine entsprechend anspruchsvolle Leistungsregulierung ist deshalb nur in Verbindung mit einer wirksamen Absicherung gegen allfällige Regelfehler sinnvoll, wobei unter den gegebenen Umständen lediglich die Leistung selbst als Fehlerkriterium dienen kann. Die Bewältigung dieser Aufgabe erfordert somit einen der Genauigkeit der Leistungssteuerung angemessen hohen zusätzlichen Einsatz.The connection of pipeline parts made of weldable thermoplastic Material by charging a metallic one lying between the connecting parts Resistance with electrical current is a technology that has been tried and tested for years. As an aid Different types of energy metering devices have been developed, which the welding performance and allow the welding time to be tailored to the respective needs. The power setting depends on the type and size of the connection to be welded and works the welding time based on the energy requirement. Since welding operations are unsteady There is a connection between the welding time and the energy requirement. Therefore, for connections of the same type and size, even with thermal With identical starting and ambient conditions, a constant energy requirement is only then achieved are assumed, if always with at least approximately the same performance will. An energy dosage without simultaneous power stabilization means therefore either waiver of high-quality regulation or Acceptance of an additional welding parameter that is difficult to determine in terms of control technology. From this point of view, it was obvious to try to solve the problem as much as possible to strive for precise performance and adherence to the corresponding target values in terms of time. However, experience shows that it requires a relatively high technical effort in order to ensure the necessary accuracy of the power control in this context to be able to. In addition, in practice the more technical regulation becomes more important as it occurs Inadequacies are to be expected, the narrower the tolerable working margin is. The effort for a correspondingly demanding power regulation is therefore only makes sense in connection with an effective safeguard against possible control errors, under the given circumstances only the performance itself as an error criterion can serve. Dealing with this task thus requires one of accuracy appropriately high additional input for power control.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die geschilderten Schwierigkeiten zu vermeiden und die regeltechnische Zielsetzung in befriedigender Weise zu realisieren, ohne von den einzelnen Regelteilkreisen mehr als handelsübliche Genauigkeit fordern zu müssen. Diese Aufgabe wird dadurch gelöst, dass die Schweissleistung oder der quadratisch gemittelte Istwert J, resp.The present invention is based on the object described Avoid difficulties and set the regulatory objectives in a more satisfactory manner Way to realize without more of the individual control sub-circuits than commercially available To have to demand accuracy. This task is achieved in that the welding performance or the square averaged actual value J, resp.

U, des Schweissstromes J, resp. der Schweissspannung U, in an sich bekannter Art - beispielsweise mittels einer Phasenanschnittsteuerung - mindestens ungefähr auf Sollwert stabilisiert und die restliche Istwert-Abweichung über die Schweisszeit t so kompensiert wird, dass die Integration lo (J ' U) dt oder rt J dt, resp. x U2 dt, stets wenigstens annähernd den für die betreffende Verbindung festgelegten Wert ergibt.U, of the welding current J, respectively. the welding voltage U, in per se known type - for example by means of a phase control - at least approximately stabilized at the target value and the remaining actual value deviation via the Welding time t is compensated so that the integration lo (J 'U) dt or rt J dt, resp. x U2 dt, always at least approximately that for the connection in question determined value.

Erfindungsgemäss wird somit eine Leistungsstabilisierung mit einer die Schweisszeit leistungsabhängig regulierenden Energiedosierung kombiniert. Die dadurch gewährleistete zeitliche Kompensation allfälliger (limitierter) Leistungsabweichungen vom Sollwert erlaubt, die Qualitätsansprüche an die Leistungsregulierung so weit zu reduzieren, als im Hinblick auf die Schweisszeitabhängigkeit des Energiesollwertes verantwortbar ist. Dies ist erfahrungsgemäss der Fall, wenn die Schweisszeit nicht mehr als etwa 10 bis 15 % von der dem Schweissleistungs-Sollwert zugeordneten Soll-Schweisszeit abweicht. Mit ungefähr gleichem Spielraum ist selbst dann zu rechnen, wenn die zwischen den Verbindungsteilen angeordneten metallischen Widerstände durch ausgeprägte Temperaturabhängigkeit charakterisiert sind und die Leistungssteuerung nur eine der beiden Leistungskomponenten als Regelgrösse berücksichtigt. Unter den gegebenen Umständen vermag also bereits eine auf ca. + 6 % genau arbeitende Strom- oder Spannungsregulierung zu befriedigen. Damit ist es beim heutigen Stand der elektrischen Regeltechnik unproblematisch, die ohnehin in den meisten Fällen notwendige Abstimmung der Schweissleistung in Verbindung mit bekannten Stabilisierungsmassnahmen über einen breiten Bereich ausreichend genau einstellbar und stabil auszubilden. Ein weiterer und ebenso wichtiger Vorteil des Erfindungsgegenstandes besteht in der Möglichkeit, die Schweisszeit als Indikator für das richtige Funktionieren des Energiedosiergerätes zu nutzen. Weicht nämlich die Schweisszeit über ein tolerierbares Mass von einem gegebenen Sollwert ab, so muss ein Fehler bei der Leistungsdosierung oder/und beim Schweisszeitkreis vorliegen. Dabei können sich - von groben Leistungssteuerfehlern abgesehen - lediglich Zeitsteuerfehler, und diese zudem nur in linearen Proportionen, schweisstechnisch nachteilig auswirken. Darüberhinaus hat die Schweisszeit den Vorteil, für eine Automation der Geräteüberwachung besonders geeignet zu sein, wobei es lediglich eine Frage der Gestaltung des Referenzzeitkreises ist, um selbst den sehr unwahrscheinlichen Fall der Ueberlagerung eines Leistungssteuerfehlers und eines in bezug auf die Funktionsfehlerindikation kompensierend wirkenden Schweisszeitkreisfehlers erfassen zu können. Eine automatische Funktionsfehlererfassung entspricht in idealer Weise dem erhöhten Sicherheitsbedürfnis im Zusammenhang mit Rohrleitungen für den Transport gefährlicher Medien. Von den bereits erwähnten zwei Möglichkeiten einer Beschränkung der Leistungssteuerung auf nur eine der beiden Leistungskomponenten ist die Schweissstromregulierung insofern die vorteilhaftere, als der Spannungsabfall in der Verbindungsleitung zwischen Steuergerät und Verbraucherwiderstand regeltechnisch nicht berücksichtigt werden muss. Ausserdem ist die Schweissstromregulierung besonders geeignet für eine Vereinheitlichung der Regelsollwerte innerhalb eines bestimmten Applikationsbereiches durch gegenseitiges Abstimmen der zum Programm gehörenden Verbindungsteile. Selbstverständlich ist bei Energiedosiergeräten gemäss Patentanspruch die bereits seit langem bekannte und in der Praxis gelegentlich genutzte Möglichkeit einer automatischen Anpassung der Schweissenergie an eine die schweisstechnischen Randbedingungen charakterisierende Temperatur - z.B. die Umgebungstemperatur - ebenfalls gegeben, indem in üblicher Weise mit Hilfe von temperaturabhängigen Regelgliedern angemessenen Einfluss auf die Schweisszeitsteuerung und nötigenfalls auch auf den Referenzzeitkreis ausgeübt werden kann.According to the invention, a power stabilization with a the welding time combined power-dependent regulating energy dosage. the any temporal compensation guaranteed thereby (limited) Power deviations from the target value allowed, the quality demands on the power regulation to be reduced as much as with regard to the welding time dependency of the energy setpoint is responsible. Experience has shown that this is the case when the welding time is not more than about 10 to 15% of the target welding time assigned to the welding power target value deviates. Approximately the same margin can be expected even if the between the metallic resistors arranged in the connecting parts due to pronounced temperature dependency are characterized and the power control is only one of the two power components considered as a controlled variable. So under the given circumstances, I can already to satisfy a current or voltage regulation that works with an accuracy of approx. + 6%. With the current state of electrical control technology, it is therefore not a problem the coordination of the welding performance in most cases, which is necessary anyway Combination with known stabilization measures is sufficient over a wide range to be precisely adjustable and stable. Another and equally important advantage of the subject matter of the invention is the possibility of using the welding time as an indicator for the correct functioning of the energy metering device. Namely, gives way the welding time from a given target value beyond a tolerable level, see above there must be an error in the power metering and / or in the welding time circuit. Apart from gross power control errors, only timing errors, and these only have a disadvantageous effect in terms of welding technology in linear proportions. In addition, the welding time has the advantage of automating the device monitoring to be particularly suitable, whereby it is only a question of the design of the reference time circle is to even the very unlikely event of a power control error superimposed and a welding time cycle error that has a compensating effect with respect to the functional error indication to be able to capture. An automatic detection of malfunctions corresponds ideally Way of the increased need for security in connection with pipelines for the Transport of dangerous media. Of the two options already mentioned a limitation of the power control to only one of the two power components the welding current regulation is the more advantageous than the voltage drop in the connection line between the control unit and the consumer resistor does not have to be taken into account. In addition, the welding current regulation is special suitable for standardizing the control setpoints within a certain Application area through mutual coordination of those belonging to the program Connecting parts. It goes without saying that for energy metering devices according to the patent claim the option that has been known for a long time and is occasionally used in practice an automatic adjustment of the welding energy to the welding technology Temperature characterizing boundary conditions - e.g. the ambient temperature - also given by in the usual way with the help of temperature-dependent control elements appropriate influence on the welding time control and, if necessary, on the Reference timing can be exercised.

Die beschriebene Schweisszeitregulierung kann unter der Voraussetzung einer relativ guten Reglerstabilität beispielsweise realisiert werden, indem die als Regelgrösse dienende Leistungskomponente eine Lichtquelle steuert, welche ihrerseits einen lichtempfindlichen Widerstand im Aufladekreis eines Kondensators so beeinflusst, dass sich die Zeiten bis zur Erreichung einer bestimmten Kondensatorspannung etwa umgekehrt proportional zum Quadrat der Steuergrösse verhalten. Eine von der Qualität der Leistungsstabilisierung weitgehend unabhängige und deshalb neben andern Gründen besonders attraktive Möglichkeit ergibt sich durch an sich bekannte Kombinationen multiplizierender und integrierender Elektronikelemente, wobei der Abbruch von Schweissvorgängen beim Erreichen eines vorgegebenen Integrationswertes ausgelöst wird.The described welding time regulation can under the prerequisite a relatively good controller stability can be realized, for example, by the The power component serving as a control variable controls a light source, which in turn influences a light-sensitive resistor in the charging circuit of a capacitor in such a way that that the times until a certain capacitor voltage is reached is approximately behave inversely proportional to the square of the tax variable. One of the quality the performance stabilization largely independent and therefore among other reasons a particularly attractive option results from combinations known per se multiplying and integrating electronic elements, with the abortion of welding processes is triggered when a specified integration value is reached.

Solche Elemente sind dank Serienfertigung zu Preisen erhältlich, die für den beschriebenen Zweck wirtschaftlich absolut tragbar sind.Such elements are available thanks to series production at prices that are absolutely economically viable for the purpose described.

Zur Erläuterung des Erfindungsgegenstandes ist in der Zeichnung ein Ausfilhrungsbeispiel als Blockschaltbild dargestellt. Dabei erfolgt die Stromversorgung über Netzanschlusskabel 1 und Regelgerät-Hauptschalter 2. Ein Netzteil 3 sorgt für die Speisung der verschiedenen Regelkreise. Wird das Schweissstromkabel 4 an den Verbraucherwiderstand 5 angeschlossen, so kann über die in Ruhestellung gezeigten Kontakte 6 eines zum Ein-/Ausschaltkreis 7 gehörenden Schützes beispielsweise ein niedergespannter Kontrollstrom fliessen. Dieser schafft die Voraussetzung für das Auslösen von Schweissvorgängen, was mit einer Umschaltung der Kontakte 6 auf Schweissspannung verbunden ist. Die Auslösung geschieht durch Betätigung der Schalttaste 8. Während des Schweissens sorgt die Leistungsregulierung 9 entsprechend der Leistungs-Istwerterfassung 10 über das Leistungsstellglied 11 für eine dem Verbraucherwiderstand angemessene Abstimmung und Stabilisierung der Schweissleistung. Sobald die zeitliche Integration der von der Istwerterfassung 12 dem Schweisszeitkreis 13 zugeleiteten Schweissleistungsdaten einen vorgegebenen Sollwert erreicht, bewirkt die Schweisszeitregulierung 13 über den Ein-/Ausschaltkreis 7 den Abbruch der Schweissoperation. Der Differenzzeitkreis 14 ermittelt die Zeitspanne zwischen dem Abbruch des Schweissvorganges und einem vom Referenzzeitkreis 15 gelieferten Signal und bewirkt beim Ueberschreiten einer gegebenen Toleranzgrenze die Auslösung der Fehleranzeige 16.To explain the subject matter of the invention is in the drawing Exemplary embodiment shown as a block diagram. Thereby the power supply takes place via mains connection cable 1 and control unit main switch 2. A power supply unit 3 ensures the supply of the various control loops. If the welding current cable 4 is connected to the Load resistor 5 connected, so can be shown in the rest position Contacts 6 of a contactor belonging to the on / off circuit 7, for example low-voltage control current flow. This creates the conditions for that Triggering of welding processes, which results in a switchover of the contacts 6 to welding voltage connected is. It is triggered by pressing the switch button 8. During of the welding, the power regulator 9 takes care of the actual power value acquisition 10 via the power actuator 11 for an appropriate consumer resistance Coordination and stabilization of the welding performance. Once the temporal integration the welding performance data fed to the welding time circuit 13 by the actual value acquisition 12 reaches a predetermined target value, causes the welding time control 13 via the on / off circuit 7 to abort the welding operation. The difference time cycle 14 determines the time span between the abortion of the welding process and a from the reference timing circuit 15 supplied signal and causes when a given tolerance limit the triggering of the error display 16.

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Claims (6)

Patentansprüche 1. Elektrisches Gerät für dosierte Energieabgabe an mit Joule'scher Wärme schweissbare thermoplastische Rohrleitungsteile, dadurch gekennzeichnet, dass die Schweissleistung oder der quadratisch gemittelte Istwert J, resp. U, des Schweissstromes J, resp. der Schweissspannung U, in an sich bekannter Art - beispielsweise mittels einer Phasenanschnittsteuerung -mindestens ungefähr auf Sollwert stabilisiert und die restliche Istwert-Abweichung über die Schweisszeit t so kompensiert wird, dass die Integration 0ft (J #j U) dt oder St J dt, resp. Claims 1. Electrical device for metered energy delivery on thermoplastic pipeline parts that can be welded with Joule heat, thereby marked that the welding performance or the square mean actual value J, resp. U, of the welding current J, respectively. the welding voltage U, in known per se Type - for example by means of a phase control - at least approximately stabilized at the target value and the remaining actual value deviation over the welding time t is compensated so that the integration 0ft (J #j U) dt or St J dt, respectively. t 2 U U dt,stets wenigstens annähernd den für die betreffende Verbindung festgelegten Wert ergibt. t 2 U U dt, always at least approximately that for the connection in question determined value. 2. Elektrisches Gerät gemäss Anspruch 1, dadurch gekennzeichnet, dass die zeitliche Limitierung von Schweissvorgängen mit an sich bekannten Kombinationen multiplizierender und integrierender Elektronikelemente bewerkstelligt wird.2. Electrical device according to claim 1, characterized in that the time limitation of welding processes with known combinations multiplying and integrating electronic elements is accomplished. 3. Elektrisches Gerät gemäss Anspruch 1, dadurch gekennzeichnet, dass die Differenz der Schweisszeit t gegenüber einer durch separaten Zeitkreis gegebenen Referenzzeit mittels eines dritten Zeitkreises erfasst wird, wobei dieser bei Ueberschreitung einer adequaten Toleranzgrenze ein Signal auslöst.3. Electrical device according to claim 1, characterized in that the difference between the welding time t and that given by a separate time circuit Reference time is recorded by means of a third time circuit, this when exceeded an adequate tolerance limit triggers a signal. 4. Elektrisches Gerät gemäss Anspruch 3, dadurch gekennzeichnet, dass als Referenz zeit die dem Schweissleistungssollwert oder dem Soll-Schweissstrom, resp. der Soll-Schweissspannung, zugeordnete Soll-Schweisszeit gewählt ist.4. Electrical device according to claim 3, characterized in that as a reference time, the welding power setpoint or the setpoint welding current, resp. the target welding voltage, assigned target welding time is selected. 5. Elektrisches Gerät gemäss Anspruch 3, dadurch gekennzeichnet, dass der Referenzzeitkreis eine dem Schweisszeitkreis mindestens ähnliche Abhängigkeit von der Schweissleistung aufweist.5. Electrical device according to claim 3, characterized in that the reference time cycle has a dependency at least similar to the welding time cycle of the welding performance. 6. Elektrisches Gerät gemäss Anspruch 2, dadurch gekennzeichnet, dass anstelle einer Quadrierung des Strom-, resp. des Spannungs-Istwertes unter Verwendung eines Multiplikatorelementes der Istwert direkt als quadratischer Mittelwert erfasst wird, vorzugsweise mit Hilfe eines Thermoumformers (Thermokreuz).6. Electrical device according to claim 2, characterized in that instead of squaring the current, respectively. the actual voltage value using of a multiplier element, the actual value is recorded directly as a square mean value is, preferably with the help of a thermal converter (thermal cross).
DE2716055A 1977-04-09 1977-04-09 Electrical device for metered energy delivery to an electrical resistor located between thermoplastic pipe parts to be welded Expired DE2716055C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2716055A DE2716055C2 (en) 1977-04-09 1977-04-09 Electrical device for metered energy delivery to an electrical resistor located between thermoplastic pipe parts to be welded
FR7711029A FR2387110A1 (en) 1977-04-09 1977-04-13 Control system feeding predetermined amt. of power - to thermoplastic tube sections weldable by the Joule effect

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2716055A DE2716055C2 (en) 1977-04-09 1977-04-09 Electrical device for metered energy delivery to an electrical resistor located between thermoplastic pipe parts to be welded
FR7711029A FR2387110A1 (en) 1977-04-09 1977-04-13 Control system feeding predetermined amt. of power - to thermoplastic tube sections weldable by the Joule effect

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DE2716055A1 true DE2716055A1 (en) 1978-10-19
DE2716055C2 DE2716055C2 (en) 1981-09-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035197B1 (en) * 1980-03-01 1983-04-27 BASF Aktiengesellschaft Device for heating flat thermoplastic semi-finished goods

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH636174A5 (en) * 1979-03-19 1983-05-13 Von Roll Ag Plastic collar which can be electrically welded

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH398957A (en) * 1962-10-22 1966-03-15 Rollmaplast Ag Electric power supply for connecting fittings and pipes made of weldable plastic

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH398957A (en) * 1962-10-22 1966-03-15 Rollmaplast Ag Electric power supply for connecting fittings and pipes made of weldable plastic

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035197B1 (en) * 1980-03-01 1983-04-27 BASF Aktiengesellschaft Device for heating flat thermoplastic semi-finished goods

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DE2716055C2 (en) 1981-09-24
FR2387110B1 (en) 1980-12-26
FR2387110A1 (en) 1978-11-10

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