DE2544515C3 - Device for heating element butt welding - Google Patents

Device for heating element butt welding

Info

Publication number
DE2544515C3
DE2544515C3 DE2544515A DE2544515A DE2544515C3 DE 2544515 C3 DE2544515 C3 DE 2544515C3 DE 2544515 A DE2544515 A DE 2544515A DE 2544515 A DE2544515 A DE 2544515A DE 2544515 C3 DE2544515 C3 DE 2544515C3
Authority
DE
Germany
Prior art keywords
heating element
circuit breaker
switch
residual current
current circuit
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
Application number
DE2544515A
Other languages
German (de)
Other versions
DE2544515A1 (en
DE2544515B2 (en
Inventor
Karl 6232 Bad Soden Bemelmann
Norbert 6451 Bischofsheim Jablonski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim GmbH
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 Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Priority to DE2544515A priority Critical patent/DE2544515C3/en
Priority to AT696976A priority patent/AT350148B/en
Priority to CH1246976A priority patent/CH595203A5/xx
Priority to GB4082276A priority patent/GB1492369A/en
Priority to BE171213A priority patent/BE846914A/en
Priority to NL7610959A priority patent/NL7610959A/en
Publication of DE2544515A1 publication Critical patent/DE2544515A1/en
Publication of DE2544515B2 publication Critical patent/DE2544515B2/en
Application granted granted Critical
Publication of DE2544515C3 publication Critical patent/DE2544515C3/en
Expired 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
    • B29C65/18—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
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/24—Electric supply or control circuits therefor
    • B23K11/241—Electric supplies
    • B23K11/246—Electric supplies for flash welding
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/87—Auxiliary operations or devices
    • B29C66/874—Safety measures or devices
    • 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
    • B29C66/9141—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 temperature
    • B29C66/91421—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 temperature of the joining tools
    • 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
    • B29C66/9141—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 temperature
    • B29C66/91431—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 temperature the temperature being kept constant over time
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/33—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/861—Hand-held tools
    • 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
    • B29C66/949—Measuring or controlling the joining process by measuring or controlling the time characterised by specific time values or ranges

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Arc Welding Control (AREA)
  • Control Of Resistance Heating (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Description

Die Erfindung betrifft eine Einrichtung zum Heizelement-Stumpfschweißen mit einem elektrisch beheizten Heizelement, welches über ein Steuergerät an das örtliche Stromversorgungsnetz angeschlossen ist.The invention relates to a device for heating element butt welding with an electrically heated heating element, which is connected to the local power supply network is connected.

Beim Heizelement-Stumpfschweißen (s. auch den Artikel »Über das Heizelementschweißen von Großrohren aus PE hart«, veröffentlicht im »Plastverarbeiter«, Heft 11, 1967) werden überwiegend elektrisch beheizte Heizelemente, auch Heizspiegel genannt, eingesetzt Die Ausführung dieser Heizelemente ist mitentscheidend für die zu erreichende Schweißnahtgüte. Zugleich beeinflußt deren Grundkonzeption, insbesondere bei den allen Witterungsunbilden ausgesetzten Geräten, die Sicherheit des Bedienungspersonals. Die turn Einsatz kommenden Heizelemente sind imHinblick darauf, daß sie vorwiegend zur Erwärmung von Rohren eingesetzt werden, in herkömmlicher Form aufgebaut, d. h., in einen ringförmigen, metallischen Grundkörper lind, je nach der geforderten Heizleistung ein oder mehrere Heizkörper eingebettet. Die Heizkörper sind im Regelfall als Heizspiralen ausgebildet, welche von keramischen Isolationsmaterialien umgeben sind, wobei die Anzahl und die Dimensionierung der Heizspiralen Abhängig von der notwendigen Heizleistung ist. Diese Heizspiralen werden der Einfachheit halber meist zwei- oder dreiphasig an das örtliche Stromversorgungsnetz Angeschlossen, wodurch jedoch auf Grund der hohen Betriebsspannung das Bedienungspersonal bei unsachgemäßer Absicherung des Heizelementes gefährdet ist. Bisher wurde die Gefahr für das Bedienungspersonal durch besondere Schutzmaßnahmen dadurch verhindert, daß ζ. Β. zwischen Netzanschluß und Heizelement ein Trenntransformator zwischengeschaltet ist. Bei dem rauhen Baustellenbetrieb kommt es jedoch vor, daß aus unterschiedlichen Gründen — oft ist es Bequemlichkeit — die Sicherheitsvorkehrungen nicht mit der notwendigen Sorgfalt getroffen werden und beispielsweise die Energieversorgung lediglich über ein 3poliges Kabel Von einer Schukosteckdose aus erfolgt. Da aber die hierbei vorgesehene Schutzmaßnahme in Folge schlechten Schutzleiterkontaktes manchmal unwirksam bleibt, kann trotz des vorgesehenen Schutzleiters das Bedienungspersonal, insbesondere durch Erdschlüsse, gefährdet werden. Darüber hinaus kann es durch den hichtwirksamen Schutzleiter bzw. durch einen unterbrochenen Schutzleiter vorkommen, daß die auf Grund der an einer Baustelle vorhandenen Feuchtigkeit eine Herabsetzung der Isolationswirkung der die Heizspiralen umgebenden Keramikisolation bewirkt, so daß diese Isolation unwirksam wird und die hohe Betriebsspannung am Heizelement-Grundkörper anliegt, wodurch bei einer Berührung des Grundkörpers das Bedienungspersonal erheblich gefährdet wird.For heated tool butt welding (see also the article »About heated tool welding of large pipes made of hard PE ", published in" Plastverarbeiter ", issue 11, 1967) are predominantly electrical heated heating elements, also called heating mirrors, used. The design of these heating elements is decisive for the weld seam quality to be achieved. At the same time influences their basic concept, in particular in the case of devices exposed to all kinds of adverse weather conditions, the safety of the operating personnel. the Turning heating elements are used in the sense that they are mainly used for heating pipes are used, built in conventional form, d. i.e., in an annular, metallic base body lind, one or more radiators are embedded depending on the required heating output. The radiators are usually designed as heating coils which are surrounded by ceramic insulation materials, with the number and dimensioning of the heating coils depends on the required heating power. These For the sake of simplicity, heating coils are usually two- or three-phase to the local power supply network Connected, however, due to the high operating voltage, the operating personnel in the event of improper use Protection of the heating element is at risk. So far the danger to the operating personnel has been prevented by special protective measures that ζ. Β. between mains connection and heating element an isolating transformer is interposed. In the rough construction site operation, however, it happens that from For various reasons - often it is convenience - the safety precautions are inconsistent with the necessary Care must be taken and, for example, the power supply only via a 3-pole cable From a Schuko socket. But since the protective measure provided here is bad as a result Protective conductor contact sometimes remains ineffective, the operating personnel can, despite the provided protective conductor, particularly endangered by earth faults. In addition, it can be through the effective protective conductor or an interrupted protective conductor that the due to the Moisture present at a construction site reduces the insulating effect of the heating coils surrounding ceramic insulation, so that this insulation is ineffective and the high operating voltage rests on the heating element base body, whereby the operating personnel when the base body is touched is seriously endangered.

Durch den Sonderdruck aus Siemens-Elektrodienst, April 1960, Heft 2, S. 8 und 9 ist es bekannt, zum Schutz des Bedienungspersonals auf Baustellen in dem Baustellen-Verteiler Fehlerstrom-Schutzschalter vorzusehen. Ein Hinweis auf einen Prüfschalter zum Prüfen, ob die Schutzleiterverbindung/Erdung zwischen Verbraucher und Baustellen-Verteiler gegeben ist, offenbart der Sonderdruck nicht Darüber hinaus ist aus der DE-AS 11 61 631 eine fehlerstromgeschützte elektrische Anlage bekanntgeworden, bei der der Fehlerstrom-Schutzschalter ausgelöst wird, sobald die Schutzleiterverbindung/Erdung zwischen einem Verbraucher und einem Stromversorgungsnetz (während der Versorgung des Verbrauchers, also während des Betriebes) unterbrochen ist Eine Kontrolle des Schutzleiters vor Inbetriebnahme des Gerätes ist bei dieser Anlage nicht möglich.Through the special print from Siemens electrical service, April 1960, Issue 2, pp. 8 and 9, it is known for protection of the operating personnel on construction sites to provide residual current circuit breakers in the construction site distributor. A reference to a test switch to check whether the protective conductor connection / grounding between consumers and construction site distribution is given, the special edition does not disclose. In addition, it is from the DE-AS 11 61 631 a fault current protected electrical System became known in which the residual current circuit breaker is triggered as soon as the protective conductor connection / grounding between a consumer and a power supply network (during supply of the consumer, i.e. during operation). Check the protective conductor Commissioning of the device is not possible with this system.

Aufgabe der Erfindung ist es, ausgehend von den bekannten fehlerstromgeschützten Anlagen sowie einer Einrichtung zum Heizelement-Stumpfschweißen der eingangs genannten Art diese Einrichtung so auszubilden, daß das Bedienungspersonal der Einrichtung jederzeit, und insbesondere vor Beginn der Arbeiten, feststellen kann, ob die notwendigen Sicherheitsmaßnehmen wirksam werden können.The object of the invention is based on the known fault current protected systems and a Device for heating element butt welding of the type mentioned above to design this device in such a way that that the operating personnel of the facility at any time, and in particular before the start of work, can determine whether the necessary security measures can be effective.

Zur Lösung der Aufgabe wird gemäß der Erfindung vorgeschlagen, daß in dem zwischen Heizelement und örtlichem Stromversorgungsnetz vorgesehenen Steuergerät ein Fehlerstrom-Schutzschalter, der eine Prüfvorrichtung aufweist, vorgesehen ist und daß ferner an das Heizelement ein Schutzleiter sowie ein Erdungsstab angeschlossen sind, die wahlweise über einen Prüfschalter mit dem Fehlerstrom-Schutzschalter verbindbar sind. Durch diesen Fehlerstrom-Schutzschalter, welcher im Aufbau an sich bekannt ist, wird zum einen der Bedienungsmann sicher gegen Fehlerströme, die über einen Schutzleiter bzw. über einen vorgesehenen Erdungsstab fließen, geschützt, und zwar wird je nach Ausführung des Fehlerstrom-Schalters innerhalb weniger Millisekunden, beispielsweise 30 msec, der Fehlerstrom-Schutzschalter ausgelöst und die gesamte Energiezufuhr unterbrochen. Damit wird das Bedienungspersonal wirksam gegen fehlerhafte Stromzuführen etc. geschützt.To solve the problem, it is proposed according to the invention that in the between the heating element and local power supply network provided control device a residual current circuit breaker, which a test device has, is provided and that a protective conductor and a grounding rod are also attached to the heating element are connected, which can optionally be connected to the residual current circuit breaker via a test switch are. This residual current circuit breaker, which is known per se in terms of its structure, is on the one hand the Operator safe against fault currents via a protective conductor or via a provided Earthing rod flow, protected, depending on the design of the residual current switch within a few Milliseconds, for example 30 msec, the residual current circuit breaker is triggered and the entire energy supply interrupted. In this way, the operating personnel are effective against incorrect power supply, etc. protected.

Durch den Prüfschalter wird es in Verbindung mit der Prüfvorrichtung des Fehlerstrom-Schutzschalters vorteilhaft möglich, vor dem Schweißen, also vor Inbetriebnahme des Gerätes, zu kontrollieren, ob der Schutzleiter bzw. die über den Erdungsstab zusätzlich vorgesehene Erdung zwischen örtlichem Stromversorgungsnetz, Heizelemente und Erdungsstab wirksam ist. Der vorgesehene Fehlerstrom-Schutzschalter wird vorteilhaft zur Prüfung/Kontrolle der vorgesehenen Nullung, welche über den Erdungsstab (Hilfserder) in besonders günstiger Art und Weise verbessert ist, benutzt.The test switch makes it advantageous in connection with the test device of the residual current circuit breaker possible to check whether the Protective conductor or the additional earthing provided via the earthing rod between the local power supply network, Heating elements and ground rod is effective. The provided residual current circuit breaker is advantageous for checking / checking the intended zeroing, which is carried out via the earthing rod (auxiliary earth rod) in is improved in a particularly favorable manner.

Durch die Erfindung wird somit einerseits vor dem Schweißbeginn, also vor Inbetriebnahme, die Kontrolle des an das Heizelement herangeführten Schutzleiters und die Kontrolle des zusätzlichen Erdungsstabes ermöglicht und andererseits während dem Schweißen bei fehlerhafter Isolation und unsachgemäßer Berührung der spannungsführenden Teile durch einen Bedienungsmann das Abschalten der Energiezuführung innerhalb Von kurzer Zeit (30 msec.) erreicht. Das Abschalten wird dabei von einem Fehlerstrom ausee-By means of the invention, on the one hand, the control is carried out before the start of welding, that is to say before commissioning of the protective conductor brought up to the heating element and the control of the additional earthing rod and on the other hand during welding in the event of faulty insulation and improper contact of the live parts by an operator to switch off the energy supply reached within a short time (30 msec.). The shutdown is based on a fault current.

löst, welcher über den geprüften Schutzleiter und/oder Erdungsstab fließt bzw. welcher im Falle eines Schutzleiterbruches nur über den Erdungsstab fließt.triggers which via the tested protective conductor and / or Earthing rod flows or, in the event of a protective conductor break, only flows through the earthing rod.

In der nachfolgenden Beschreibung Wird anhand eines Ausführungsbeispieles die Erfindung näher erläutert The following description is based on an embodiment the invention explained in more detail

In der Zeichnung ist eine Einrichtung zum Heizelement-Stumpfschweißen schematisch dargestellt und in ihrer Gesamtheit mit 10 bezeichnet Die Einrichtung 10 weist ein ikizelement 11 auf, welches über ein Steuergerät 12 mit einem örtlichen Stromversorgungsnetz »S« verbunden ist Im Steuergerät 12 sind neben dem nicht dargestellten Einschaltschütz auch die nicht näher veranschaulichte Temperatursteuerungseinrichtung zur Regelung der Heizelementtemperatur auf einen konstanten Wert enthalten.In the drawing, a device for heating element butt welding is shown schematically and denoted in its entirety by 10. The device 10 has an ikizelement 11, which is connected via a control device 12 to a local power supply network "S" Switch-on contactor also contain the temperature control device (not illustrated in more detail) for regulating the heating element temperature to a constant value.

Im Steuergerät 12 ist ein Fehlerstrom-Schutzschalter 13 vorgesehen. Der Fehlerstrom-Schutzschalter 13 besteht aus einem Schalter 14 mit zugeordnetem Schaltschfoß 15, einem Auslöser 16, einer Sekundärwicklung 17 (Auslösespule des Wandlers), einem Wandler 18 mit Primärwicklungen, einer Prüftaste 19 sowie einem Prüfwiderstand 20. Die Primärwicklungen des Wandlers 18 sind einerseits an das örtliche Stromversorgungsnetz »S« und andererseits an das Heizelement 11 angeschlossen.A residual current circuit breaker 13 is provided in the control unit 12. The residual current circuit breaker 13 consists of a switch 14 with an associated switch base 15, a release 16, a secondary winding 17 (trigger coil of the converter), a converter 18 with primary windings, a test button 19 and a test resistor 20. The primary windings of the converter 18 are on one side the local power supply network "S" and, on the other hand, connected to the heating element 11.

Ferner ist an das Heizelement ein Schutzleiter 21 angeschlossen, der über Leitungen 22a und b und einei Prüfschalter 23 mit einem Erdungsstab 24 in Verbindung steht Darüber hinaus ist der Schutzleiter zusätzlich übe ϊ eine Leitung 25 an den Fehlerstrom-Schutzschalter 13 angeschlossen. Der Prüfschalter 23 besteht, wie aus der Zeichnung ersichtlich, aus einem Schalter mit zwei Ruhekontakten und einem Arbeitskontakt dessen Wirkungsweise nachstehend erläutert wird. Der Schalter 23 ist selbstverständlich ebenfalis im Steuergerät 12 angeordnet und nur aus Übersichtsgründen außerhalb dargestelltA protective conductor 21 is also connected to the heating element and is connected to an earthing rod 24 via lines 22a and b and a test switch 23. As can be seen from the drawing, the test switch 23 consists of a switch with two normally closed contacts and one normally open contact, the mode of operation of which is explained below. The switch 23 is of course also arranged in the control unit 12 and is only shown outside for reasons of clarity

Durch die Erfindung wird zum einen, wie bereits eingangs beschrieben, eine optimale Kontrolle der gesamten Einrichtung gegen Fehlerströme erreicht undOn the one hand, as already described at the outset, the invention provides an optimal control of the entire facility against fault currents achieved and

ίο zwar dadurch, daß bei Fehlerströmen der Fehlerstrom-Schutzschalter 13 in kurzer Zeit anspricht Zum anderen wird es durch den Fehlerstrom-Schalter 13 sowie den vorgesehenen Leitungen 22a, 25 sowie dem Prüfschalter 23 möglich, die Wirksamkeit des Schutzleiters 21 zu kontrollieren. Dies erfolgt in der Weise, daß durch Drücken der Prüftaste 19 die Verbindungsleitung zwischen dem Fehlerstrom-Schutzschalter und dem örtlichen Stromversorgungsnetz »S« geprüft wird, wobei über das Schaltschloß 15 der Schalter 14 aus der geschlossenen Stellung in die in der Zeichnung veranschaulichten Stellung geschaltet wird. Die Prüfung, ob die vorgesehene Erdungsmaßnahme (Erdungsstab 24) wirksam ist wird dadurch kontrolliert daß der Prüfschalter 23 in die in der Zeichnung gestrichelt dargestellte Position gebracht wird. Die Erdung ist dann einwandfrei, wenn bei anschließendem Drücken der Prüftaste 19 der Fehlerstrom-Schutzschalter über das Schaltschloß 15 und den Schalter 14 ausgeschaltet wird. Somit ist durch den Fehlerstrom-Schutzschalter einerseits eine Kontrolle der Erdung möglich geworden und andererseits ein optimaler Schutz sichergestellt.On the other hand, the fault current switch 13 and the lines 22a, 25 and the test switch 23 make it possible to check the effectiveness of the protective conductor 21. This is done in such a way that the connection line between the residual current circuit breaker and the local power supply network "S" is tested by pressing the test button 19, the switch 14 being switched from the closed position to the position illustrated in the drawing via the switch lock 15 . The test of whether the intended earthing measure (earthing rod 24) is effective is checked in that the test switch 23 is brought into the position shown in dashed lines in the drawing. The grounding is correct if the residual current circuit breaker is switched off via the switch lock 15 and the switch 14 when the test button 19 is subsequently pressed. The earth leakage circuit breaker enables the earthing to be checked on the one hand and optimal protection on the other.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims (1)

Patentanspruch:Claim: Einrichtung zum Heizelement-Stumpfschweißen mit einem elektrisch beheizten Heizelement, welches über ein Steuergerät an das örtliche Stromversorgungsnetz angeschlossen ist, dadurch gekennzeichnet, daß im Steuergerät (12) ein Fehlerstrom-Schutzschalter (13), der eine Prüfvorrichtung (19, 20) aufweist, vorgesehen ist und daß ferner an das Heizelement (11) ein Schutzleiter (21) sowie ein Erdungsstab (24) angeschlossen sind, die wahlweise über einen Prüfschalter (23) mit dem Fehlerstrom-Schutzschalter (13) verbindbar sind.Device for heating element butt welding with an electrically heated heating element, which is connected to the local power supply network via a control device, characterized in that that in the control unit (12) a residual current circuit breaker (13), which is a test device (19, 20) is provided and that Furthermore, a protective conductor (21) and a grounding rod (24) are connected to the heating element (11), which can optionally be connected to the residual current circuit breaker (13) via a test switch (23).
DE2544515A 1975-10-04 1975-10-04 Device for heating element butt welding Expired DE2544515C3 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE2544515A DE2544515C3 (en) 1975-10-04 1975-10-04 Device for heating element butt welding
AT696976A AT350148B (en) 1975-10-04 1976-09-20 DEVICE FOR HEATING ELEMENT BUTT WELDING
CH1246976A CH595203A5 (en) 1975-10-04 1976-10-01
GB4082276A GB1492369A (en) 1975-10-04 1976-10-01 Heated-tool welding device
BE171213A BE846914A (en) 1975-10-04 1976-10-04 INSTALLATION FOR BUTT-TO-BUTT WELDING USING A HEATING ELEMENT,
NL7610959A NL7610959A (en) 1975-10-04 1976-10-04 DEVICE FOR THE HEATING ELEMENT STEAM WELDING.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2544515A DE2544515C3 (en) 1975-10-04 1975-10-04 Device for heating element butt welding

Publications (3)

Publication Number Publication Date
DE2544515A1 DE2544515A1 (en) 1977-04-14
DE2544515B2 DE2544515B2 (en) 1978-06-22
DE2544515C3 true DE2544515C3 (en) 1979-02-08

Family

ID=5958340

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2544515A Expired DE2544515C3 (en) 1975-10-04 1975-10-04 Device for heating element butt welding

Country Status (6)

Country Link
AT (1) AT350148B (en)
BE (1) BE846914A (en)
CH (1) CH595203A5 (en)
DE (1) DE2544515C3 (en)
GB (1) GB1492369A (en)
NL (1) NL7610959A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3151864C2 (en) * 1981-12-30 1985-02-14 Messer Griesheim Gmbh, 6000 Frankfurt Protective device for welding power sources with one welding circuit

Also Published As

Publication number Publication date
AT350148B (en) 1979-05-10
GB1492369A (en) 1977-11-16
ATA696976A (en) 1978-10-15
NL7610959A (en) 1977-04-06
DE2544515A1 (en) 1977-04-14
BE846914A (en) 1977-01-31
DE2544515B2 (en) 1978-06-22
CH595203A5 (en) 1978-02-15

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