DE2650310C3 - Device for regulating the temperature of sweat bands lying in a heating circuit - Google Patents

Device for regulating the temperature of sweat bands lying in a heating circuit

Info

Publication number
DE2650310C3
DE2650310C3 DE19762650310 DE2650310A DE2650310C3 DE 2650310 C3 DE2650310 C3 DE 2650310C3 DE 19762650310 DE19762650310 DE 19762650310 DE 2650310 A DE2650310 A DE 2650310A DE 2650310 C3 DE2650310 C3 DE 2650310C3
Authority
DE
Germany
Prior art keywords
voltage
temperature
welding
sweatband
heating
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
DE19762650310
Other languages
German (de)
Other versions
DE2650310A1 (en
DE2650310B2 (en
Inventor
Werner 4540 Lengerich Hassmann
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
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 Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Priority to DE19762650310 priority Critical patent/DE2650310C3/en
Priority to FR7731408A priority patent/FR2369618A1/en
Priority to IT2890477A priority patent/IT1087276B/en
Priority to GB4456877A priority patent/GB1566971A/en
Priority to BR7707267A priority patent/BR7707267A/en
Publication of DE2650310A1 publication Critical patent/DE2650310A1/en
Publication of DE2650310B2 publication Critical patent/DE2650310B2/en
Application granted granted Critical
Publication of DE2650310C3 publication Critical patent/DE2650310C3/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
    • 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
    • B29C66/91313—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 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
    • B29C66/912—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
    • B29C66/91315—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 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
    • B29C66/91—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
    • 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
    • B29C66/96—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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • G05D23/2401—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor using a heating element as a sensing element
    • 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
    • B29C66/91631—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 the heat or the thermal flux being kept constant over time
    • 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
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Regeln der Temperatur von in einem Heizstromkreis liegenden Schweißbändern zum Schweißen von Kunststoffolien ο. ä. mit einer eine dem Heizstrom proportionale Signalspannung abgebenden Einrichtung.The invention relates to a device for regulating the temperature of lying in a heating circuit Sweatbands for welding plastic films ο. Ä. With a signal voltage proportional to the heating current donating institution.

Die Temperatur eines elektrisch beheizten Schweißwerkzeuges zum Schweißen von Kunststoffolien kann einmal durch am Schweißwerkzeug anliegende Thermofühler gesteuert werden, die bewirken, daß der Heizkörper des Schweißbalkens beim Unterschreiten einer Grenztemperatur zum Netz abgeschaltet wird, oder durch Verändern der dem Schweißwerkzeug zugeführten elektrischen Speisespannung in Abhängigkeit von der Voranbewegung der zu schweißenden Folie sowie durch eine Kombination dieser beiden Maßnahmen. The temperature of an electrically heated welding tool for welding plastic foils can once controlled by the welding tool applied thermal sensors, which cause the The heating element of the welding bar is switched off when the temperature falls below a limit to the network, or by changing the electrical supply voltage fed to the welding tool as a function the advance of the film to be welded and a combination of these two measures.

Die Schweißwerkzeuge können aus dauerbeheizten Bändern oder Impulsbändern bestehen. Das sind dünne metallische Bänder, an die eine geringe elektrische Spannung angelegt wird und durch die infolge ihres geringen Widerstandes ein hoher Strom fließt. Oder es werden zur Erwärmung der Schweißwerkzeuge Heizelemente mit hochohmigen, in flache Stahlrohre eingebetteten Widerstandsdrähten verwendet, an denen die Netzspannung anliegt, wobei nur ein geringer Strom fließt.The welding tools can consist of permanently heated strips or pulse strips. They are thin metallic belts to which a low electrical voltage is applied and through which, as a result of it low resistance a high current flows. Or heating elements are used to heat the welding tools used with high-resistance resistance wires embedded in flat steel tubes on which the mains voltage is applied, with only a small current flowing.

Die an Netzspannung anlegbaren Heizelemente werden in Siegelleisten verwendet, die rhythmische Hubbewegungen ausführen. Die Spannung kann den Heizelementen in einfacher und sicherer Weise zugeführt werden.The heating elements that can be connected to the mains voltage are used in sealing bars, the rhythmic ones Perform lifting movements. The voltage can be applied to the heating elements in a simple and safe manner are fed.

Dauerbeheizte Bänder sind im besonderen Maß für umlaufende Werkzeuge geeignet, weil sie nur eine niedrige Spannung benötigen, die ihnen gefahrlos ohne zusätzliche Schutzmaßnahmen zugeführt werden kann. Außerdem sind sie für Hochleistungsmaschinen besonders geeignet, weil sie aus dem Maschinenstillstand, bei dem sie lediglich mit einer Grundspannung versorgt werden, sich sehr schnell aufheizen lassen, wenn die Maschine in kurzer Zeit auf volle Leistung hochfährt.Permanently heated belts are particularly suitable for rotating tools because they only have one require low voltage, which can be fed to them safely without additional protective measures. In addition, they are particularly suitable for high-performance machines because they come from machine downtime which they are only supplied with a basic voltage, can be heated up very quickly if the Machine runs up to full power in a short time.

Ihnen kann auch bei rasch aufeinanderfolgenden Arbeitstakten ständig in genügendem Maß Wärme zugeführt werden, so daß sie die netwendige Temperatur beibehalten können.Even with rapidly successive work cycles, you can always have a sufficient amount of warmth are supplied so that they can maintain the necessary temperature.

Die dauerbeheizten Bänder benötigen wegen ihrer geringen Ansprechzeit eine exakte Temperaturregelung, die sich durch Thermofühler durchführen ließe. Diese weisen jedoch den Nachteil auf, daß durch den am Impulsband anliegenden Thermofühler eine Wärmeableitung bewirkt wird, denn an der Stelle, an der der Thermofühler mit dem Impulsband verbunden ist, wird die Wärme durch die die elektrischen Werte weitergebenden Zuleitungsdrähte abgeführt. Daher wird an dieser Stelle eine geringere Wärme gemessen und das Schweißband durch Zuschalten zur Spannungsquelle weiter aufgeheizt, so daß die Folie mit Ausnahme der Stelle, an der der Thermofühler sitzt, beim Schweißen überhitzt wird. Abgesehen davon werden zur Weiterleitung der durch den Thermofühler ermittelten Werte Schleifringe erforderlich, wodurch die Vorrichtung konstruktiv vergrößert und verteuert würde.The continuously heated belts require precise temperature control due to their short response time, which could be carried out by thermocouples. However, these have the disadvantage that by the on Pulse band adjacent thermal sensor causes heat dissipation, because at the point where the If the thermal sensor is connected to the pulse band, the heat is transmitted through the electrical values Lead wires led away. Therefore, a lower heat is measured at this point and that Sweatband is further heated by switching on the voltage source, so that the film with the exception of the The place where the thermocouple is located is overheated during welding. Apart from that it will be used for forwarding the values determined by the thermocouple slip rings required, whereby the device would be structurally enlarged and made more expensive.

Aus diesem Grund hat es nicht an Vorschlägen zur Temperatursteuerung anstelle einer Temperaturregelung von Schweißwerkzeugen, insbesondere von dauer-2) beheizten Schweißbändern, gefehlt. Aus der DE-AS 21 11024 ist eine Anordnung zur Steuerung der Temperatur einer Schweißeinrichtung zum Schweißen von Kunststoffolien in Abhängigkeit von der Durchlaufgeschwindigkeit der Kunststoffolien durch die Schweißeinrichtung bekannt, bei der eine der Durchlaufgeschwindigkeit proportionale Steuerspannung an der Steuerwicklung eines Transduklors anliegt, dessen Ausgangsspannung über einen nachgeschalteten Transformator der Schweißeinrichtung zugeführt wird.Because of this, it has run out of suggestions for temperature control instead of temperature control of welding tools, in particular of permanently 2) heated welding tapes, is missing. From the DE-AS 21 11024 is an arrangement for controlling the Temperature of a welding device for welding plastic films as a function of the throughput speed of the plastic films known by the welding device, in which one of the throughput speed proportional control voltage is applied to the control winding of a transducer whose Output voltage is fed to the welding device via a downstream transformer.

Bei einer aus der DE-PS 2109 321 bekannten Vorrichtung wird die Schweißtemperatur beim Schweißen von kontinuierlich, jedoch mit unterschiedlichen Geschwindigkeiten zu Werkstücken zu verarbeitenden Kunststoffbahnen dadurch gesteuert, daß die Heizspannung der Schweißbandes in vorgegebenen Geschwindigkeitsintervallen stufenweise verändert wird.In one known from DE-PS 2109 321 The device is the welding temperature when welding continuously, but with different The speeds of the workpieces to be processed are controlled by the heating voltage the sweatband is gradually changed at predetermined speed intervals.

Aus der DE-OS 21 37 576 ist eine Anordnung zur Steuerung der Temperatur einer Schweißeinrichtung zum Schweißen von Kunststoffolien in Abhängigkeit von der Durchlaufgeschwindigkeit der Kunststoffolien durch die Schweißeinrichtung bekannt, bei der eine der Durchlaufgeschwindigkeit proportionale Steuerung der Speisespannung der Speiseeinrichtung durch nacheinander zuschaltbare Widerstände erfolgt.From DE-OS 21 37 576 an arrangement for controlling the temperature of a welding device is for welding plastic foils depending on the throughput speed of the plastic foils known by the welding device, in which one of the throughput speed proportional control of the The supply voltage of the supply device takes place through successively connectable resistors.

Aus der DE-AS '2 65 183 ist eine Vorrichtung zur Steuerung der Heizleistung einer Draht- oder Bandglühanlage mittels eines elektrischen Stellgliedes in Abhängigkeit von der Draht- bzw. Bandgeschwindigkeit bekannt, bei der die geschwindigkeitsproportionale Steuerung der Heizleistung durch Thyristoren erfolgt.DE-AS '2 65 183 discloses a device for controlling the heating power of a wire or strip annealing system by means of an electrical actuator depending on the wire or belt speed known, in which the speed-proportional control of the heating power is carried out by thyristors.

Dem vorstehend beschriebenen Stand der Technik, bei dem eine Steuerung der Temperatur bzw. der Heizleistung erfolgt, ist gemeinsam, daß die Heizspannung durch Temperaturhersteller ohne Rückmeldung der erreichten Ist-Temperatur vorgegeben wird, so daß keine Regelung der Heizleistung oder der Temperatur stattfindet.The prior art described above, in which a control of the temperature or the Heating output takes place, what is common is that the heating voltage is supplied by the temperature manufacturer without feedback the actual temperature reached is specified, so that no control of the heating power or the temperature takes place.

Bei einer aus der DE-OS 24 08 475 bekannten Vorrichtung der eingangs angegebenen Art wird die dem Heizstrom proportionale Signalspannung an einem in dem Primärkreis des Schweißtransformators liegenden Widerstand erzeugt und zusammen mit einer durch ein Potentiometer einstellbaren Referenzspannung demIn a known from DE-OS 24 08 475 device of the type specified is the dem Signal voltage proportional to the heating current at one in the primary circuit of the welding transformer Resistance generated and together with a reference voltage that can be set by a potentiometer

Regler zugeführt, der über eine Triac und ein Reed-Relais den Primärstromkreis des Schweißtransformators in der Weise steuert, daß in dessen Sekundärkreis ein der gewünschten Schweißbandtempenitur entsprechender Strom fließtRegulator supplied, which controls the primary circuit of the welding transformer via a triac and a reed relay in such a way that in its secondary circuit a current corresponding to the desired sweatband temperature flows

Aufgabe der Erfindung ist es, für eine Vorrichtung der eingangs angegebenen Art eine vereinfachte Regelung zu schaffen. The object of the invention is to create a simplified control system for a device of the type specified at the beginning.

Erfindungsgemäß wird diese Aufgabe dadurch je- löst, daß itv> Heizstromkreis ein Stromsteiler und die m eine dem Heizstrom proportionale Signalspannung ab gebende Einrichtung angeordnet sind und daß die Differenz zwischen dieser .Signalspannung sowie einer zweiten, dem Spannungsabfall über dem Schweißband pro portionalen Signaispannung einem Regler zugeführt is wird, der über den Stromsteller den Heizstrom ver ändert, bis die Differenz der Signalspannung am Reglei eingang Null ist According to the invention, this object is achieved in that itv> heating circuit a current divider and the m a signal voltage proportional to the heating current emitting device are arranged and that the difference between this .Signalspannung and a second, the voltage drop across the sweat band proportional signal voltage to a controller is supplied, which changes the heating current via the current controller until the difference in the signal voltage at the control input is zero

Bei der erfindungsgemäßen Vorrichtung wird ein Abfallen des Widerstandes bei Entzug von Wärme da- durch ausgeglichen, daß die Spannung, die am Schweiß band anliegt, so weit erhöht wird, daß sie mit dem Heiz strom nach dem Ohmschen Gesetz einen Quotienten bildet, der dem gewählten Ausgangswert gleich ist. Die erfindungsgemäße Temperaturregelung ist sehr wirk- 2> sam und mit wenig Aufwand verbunden, weil es ledig lich erforderlich ist, Einrichtungen vorzusehen, die der am Schweißband auftretenden Spannung und dem Heizstrom proportionale Signalspannungen abgeben und diese Signalspannungen dem Regler zuführen. In the inventive device a drop in the resistance upon withdrawal of heat is balanced by DA, the voltage applied on the welding band, is increased so that they flow with the heating forms a quotient according to Ohm's law, the selected the Output value is the same. The temperature control according to the invention is very effective and involves little effort, because it is only necessary to provide devices that output signal voltages proportional to the voltage occurring on the sweatband and the heating current and feed these signal voltages to the controller.

Beim Einschalten des Heizstroms und kaltem Schweißband fließt wegen des geringeren Widerstandes des Schweißbandes ein starker Strom, der das Schweißband schnell auf Betriebstemperatur aufheizt. Die erfindungsgemäße Vorrichtung hält sodann unab- r, hängig von der jeweiligen Belastung während des Schweißbetriebes den Widerstand des Schweißbandes und damit die Schweißbandtemperaiur konstant.When the heating current is switched on and the sweatband is cold, a strong current flows due to the lower resistance of the sweatband, which quickly heats the sweatband to operating temperature. The device then considers inde- r, dependent on the respective load during the welding operation, the resistance of the welding band, and thus the Schweißbandtemperaiur constant.

Aus den DE-OS 19 08 769 und 24 47 669 ist es bekannt, zur Regelung der Temperatur eines Heiz- tu Widerstandes dessen Ist-Temperatur durch Messen der Spannungs- und Stromwerte und Bilden des Quotienten dieser Werte zu ermitteln und diesen in einem Regler einzugeben. Bei der erfindungsgemäßen Vorrichtung wird die Schweißbandtemperatur dadurch konstant r> gehalten, daß nicht der Quotient zwischen den gemessenen Spannungs- und Stromwerten, sondern eine Spannungsdifferenz dem Regler zugeführt wird.From DE-OS 19 08 769 and 24 47 669 it is known to determine the actual temperature of a heater by measuring the voltage and current values and forming the quotient of these values and to enter this in a controller to regulate the temperature of a heater . In the device according to the invention, the welding band temperature is kept constant r> by not feeding the quotient between the measured voltage and current values, but rather a voltage difference to the controller.

Um die Vorrichtung an verschiedene Heizbänder anpassen zu können, ist in weiterer Ausgestaltung der Erfindung parallel zum Schweißband ein einstellbarer Spannungsteiler geschaltet, von dem die dem Spannungsabfall über dem Schweißband proportionale Vergleichsspannung abgegriffen wird.In order to be able to adapt the device to different heating tapes, the Invention connected in parallel to the sweatband an adjustable voltage divider, from which the voltage drop A comparison voltage proportional to the sweat band is tapped.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher erläutert. In dieser zeigtAn exemplary embodiment of the invention is explained in more detail below with reference to the drawing. In this shows

Fig. 1 ein mit Gleichstrom gespeistes Schweißband und1 shows a sweatband fed with direct current and

Fig. 2 einen an Wechselspannung anliegenden Heizstromkreis.2 shows a heating circuit applied to AC voltage.

In F i g. 1 ist ein Schweißband 1 durch Zuleitungen 2,3 mit dem Gleichrichter 4 verbunden, der den Sollwertsteiler enthält, als halbgesteuerte Brücke ausgeführt ist und an der Sekundärwicklung 5 eines an einer Wechselspannungsquelle 7 anliegenden Transformators 6 angeschlossen ist. In der Leitung 3 liegt ein Shunt 8. Parallel zum Schweißband 1 ist ein Spannungsteiler 9 zur Anpassung angeschlossen. Vom Shunt 8 bzw. Spannungsteiler 9 führen Leitungen 10, 11, 12 und 14 weg, von denen die Leitungen 10, 11 die Verbindung zum Eingang eines Potentialtrenners 15. die Leitung 14 zum Ausgang des Potentialtrenners und die Leitung 12 zu dem einen Eingang eines Reglers 16 herstellen. Der noch freie Ausgang des Polentialtrenners 15 ist durch eine Leitung 17 mit dem anderen Eingang des Reglers 16 verbunden. Der Ausgang des Reglers 16 liefert über die Leitungen 18, 19 die Steuerspannung für den gesteuerten Teil der Brücke 4.In Fig. 1 is a sweatband 1 through leads 2, 3 connected to the rectifier 4, which contains the setpoint divider, is designed as a half-controlled bridge and on the secondary winding 5 of a transformer connected to an alternating voltage source 7 6 is connected. A shunt 8 is located in the line 3. A voltage divider 9 is parallel to the sweatband 1 connected for adjustment. Lines 10, 11, 12 and 14 lead from shunt 8 or voltage divider 9 away, from which the lines 10, 11 the connection to the input of a potential separator 15. the line 14 to the output of the potential separator and the line 12 to one input of a controller 16. Of the The output of the polarity separator 15 that is still free is through a line 17 to the other input of the controller 16 connected. The output of the controller 16 supplies the control voltage for the via lines 18, 19 controlled part of the bridge 4.

Fig. 2 zeigt eine Regelung eines Schweißbandes 21. das aus einer Wechselspannungsquelle 27 über einen Transformator 26 gespeist wird. Das Schweißband 21 ist üurch die Zuleitungen 23 mit der Sekundärwicklung 25 des Transformators 26 über den Übertrager 28 verbunden. In der Zuleitung 22 liegt ein Wechselstromsteller 24. Zum Schweißband 21 ist ein Spannungsteiler 37 parallel und diesem ein Brückengleichrichter 29 nachgeschaltet. Die Sekundärwicklung des Übertragers 28 ist an einen Brückengleichrichter 30 angeschlossen. Der Minusausgang von 29 ist durch eine Leitung 3t mit dem Minusausgang des Brückengleichrichters 30 verbunden. Die anderen Ausgänge der Brückengleichrichter 29, 30 sind durch Leitungen 32, 33 mit einem Regler 34 verbunden. Der Ausgang des Reglers 34 steuert über Leitungen 35, 36 den Wechselstromsteller 24, der den Temperatur-Sollwerteinsteller enthält.Fig. 2 shows a control of a sweatband 21. that from an AC voltage source 27 via a Transformer 26 is fed. The sweatband 21 is connected to the secondary winding 25 through the supply lines 23 of the transformer 26 is connected via the transformer 28. An alternating current controller is located in the supply line 22 24. A voltage divider 37 and a bridge rectifier 29 are parallel to the sweat band 21 downstream. The secondary winding of the transformer 28 is connected to a bridge rectifier 30. The negative output of 29 is connected to the negative output of the bridge rectifier 30 by a line 3t. The other outputs of the bridge rectifiers 29, 30 are through lines 32, 33 with a regulator 34 connected. The output of the controller 34 controls the AC power controller 24 via lines 35, 36, which the Contains temperature setpoint adjuster.

Der Hauptstromkreis wird so einjustiert, daß beim Einschalten ein für die Schweißung erforderlicher Strom fließt und das Schweißband 1, 21 somit eine bestimmte Temperatur erreicht. Beim Einschalten ist das Schweißband kalt und die Signalspannung am Shunt 8 bzw. am Brückengleichrichter 30 größer als am Spannungsteiler 9 bzw. am Brückengleichrichter 29 des Schweißbandes 1 bzw. 21. Solange dieser Zustand besteht, wird der Regler 16 bzw. 34 den Gleichrichter 4 bzw. Wechselstromsteller 24 öffnen, bis die beiden Signalspannungen wieder gleich sind.The main circuit is adjusted so that when it is switched on, one required for welding Current flows and the sweatband 1, 21 thus reaches a certain temperature. When switching on is the sweatband cold and the signal voltage on the shunt 8 or on the bridge rectifier 30 greater than on Voltage divider 9 or on the bridge rectifier 29 of the sweat band 1 or 21. As long as this state exists, the controller 16 or 34 will open the rectifier 4 or AC power controller 24 until the two Signal voltages are the same again.

Hierzu 2 Blatt ZeichnungenFor this purpose 2 sheets of drawings

Claims (2)

Patentansprüche:Patent claims: 1. Vorrichtung zum Regeln der Temperatur von in einem Heizstromkreis liegenden Schweißbändern zum Schweißen von Kunststoffolien o. ä. mit einer eine dem Heizstrom proportionale Signalspannung abgebenden Einrichtung, dadurch gekennzeichnet, daß im Heizstromkreis ein Stromsteller (4, 24) und die eine dem Heizstrom proportionale Signalspannung abgebende Einrichtung (8, 28) angeordnet sind und daß die Differenz zwischen dieser Signalspannung sowie einer zweiten, dem Spannungsabfall über dem Schweißband (1) proportionalen Signalspannung einem Regler (16) zugeführt wird, der über den Stromsteller (4, 24) den Heizstrom verändert, bis die Differenz der Signalspannungen am Reglereingang Null ist.1. Device for regulating the temperature of welding tapes lying in a heating circuit for welding plastic foils or similar with a signal voltage proportional to the heating current dispensing device, characterized in that that in the heating circuit a current regulator (4, 24) and the one proportional to the heating current Signal voltage emitting device (8, 28) are arranged and that the difference between this signal voltage and a second one proportional to the voltage drop across the sweatband (1) Signal voltage is fed to a controller (16), which via the power controller (4, 24) the The heating current is changed until the difference in the signal voltages at the controller input is zero. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß parallel zum Schweißband (1) ein einstellbarer Spannungsteiler (9, 37) geschaltet ist, von dem die dem Spannungsabfall über dem Schweißband (1) proportionale Vergleichsspannung abgegriffen wird.2. Apparatus according to claim 1, characterized in that a parallel to the sweatband (1) adjustable voltage divider (9, 37) is connected, of which the voltage drop across the Sweatband (1) proportional comparison voltage is tapped.
DE19762650310 1976-11-02 1976-11-02 Device for regulating the temperature of sweat bands lying in a heating circuit Expired DE2650310C3 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE19762650310 DE2650310C3 (en) 1976-11-02 1976-11-02 Device for regulating the temperature of sweat bands lying in a heating circuit
FR7731408A FR2369618A1 (en) 1976-11-02 1977-10-19 AVAILABLE
IT2890477A IT1087276B (en) 1976-11-02 1977-10-24 DEVICE FOR THE TEMPERATURE ADJUSTMENT OF WELDING TAPES
GB4456877A GB1566971A (en) 1976-11-02 1977-10-26 Apparatus for controlling the temperature of an electrically heated welding band
BR7707267A BR7707267A (en) 1976-11-02 1977-10-31 DEVICE FOR ADJUSTING THE TEMPERATURE OF WELDING TAPES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762650310 DE2650310C3 (en) 1976-11-02 1976-11-02 Device for regulating the temperature of sweat bands lying in a heating circuit

Publications (3)

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DE2650310A1 DE2650310A1 (en) 1978-05-03
DE2650310B2 DE2650310B2 (en) 1979-03-08
DE2650310C3 true DE2650310C3 (en) 1981-09-03

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DE19762650310 Expired DE2650310C3 (en) 1976-11-02 1976-11-02 Device for regulating the temperature of sweat bands lying in a heating circuit

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BR (1) BR7707267A (en)
DE (1) DE2650310C3 (en)
FR (1) FR2369618A1 (en)
GB (1) GB1566971A (en)
IT (1) IT1087276B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4267434A (en) * 1979-06-14 1981-05-12 Honeywell Inc. Method of and apparatus for heat processing photosensitive material
DE4117706A1 (en) * 1991-05-30 1992-12-03 Alois Hoeft Plastic bottle closer compressing heated portion of neck - forms tight seal by bringing together electrically-heated jaws of clamp around neck at its m.pt.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1210432A (en) * 1968-02-20 1970-10-28 Quicfit & Quartz Ltd Improvements in and relating to electronic circuits for temperature control
DE2447669A1 (en) * 1974-10-05 1976-04-15 Kernforschung Gmbh Ges Fuer Temperature control of resistance heating - using measurement of voltage and current instantaneous values on filament resistance
JPS54106410U (en) * 1978-01-12 1979-07-26

Also Published As

Publication number Publication date
FR2369618A1 (en) 1978-05-26
DE2650310A1 (en) 1978-05-03
BR7707267A (en) 1978-07-25
DE2650310B2 (en) 1979-03-08
IT1087276B (en) 1985-06-04
GB1566971A (en) 1980-05-08

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