DE2650310A1 - DEVICE FOR REGULATING THE TEMPERATURE OF WELDING RIBBONS - Google Patents
DEVICE FOR REGULATING THE TEMPERATURE OF WELDING RIBBONSInfo
- Publication number
- DE2650310A1 DE2650310A1 DE19762650310 DE2650310A DE2650310A1 DE 2650310 A1 DE2650310 A1 DE 2650310A1 DE 19762650310 DE19762650310 DE 19762650310 DE 2650310 A DE2650310 A DE 2650310A DE 2650310 A1 DE2650310 A1 DE 2650310A1
- Authority
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- Germany
- Prior art keywords
- voltage
- temperature
- welding
- sweatband
- controller
- 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.)
- Granted
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Classifications
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
32 3ο1 G/ho32 3ο1 G / ho
11. Oktober 1976October 11, 1976
Windmöller & Hölscher, 454o Lengerich i.W.Windmöller & Hölscher, 454o Lengerich i.W.
Vorrichtung zum Regeln der Temperatur von SchweißbändernDevice for regulating the temperature of sweat bands
Die Erfindung betrifft eine Vorrichtung zum Regeln der Temperatur von in einem Heizstromkreis liegenden Schweißbändern zum Schweißen von Kunststoffolien ο. ä.The invention relates to a device for regulating the temperature of welding strips located in a heating circuit for welding plastic foils ο. Ä.
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 SchweißbalkensThe temperature of an electrically heated welding tool for welding plastic films can once through on the welding tool applied thermal sensors are controlled, which cause the heating element of the welding bar
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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.switched off when falling below a limit temperature to the network or by changing the electrical supply voltage supplied 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 be made from continuously heated strips or impulse bands exist. These are thin metallic strips to which a low electrical voltage is applied and through which a high current flows due to their low resistance. Or it can be used to heat the welding tools Heating elements with high-resistance resistance wires embedded in flat steel tubes are used 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 placed in sealing strips used that perform rhythmic stroke movements. The voltage can be applied to the heating elements in a more simple manner and safely supplied.
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. Ihnen kann auch bei rasch aufeinanderfolgenden Arbeits-Permanently heated belts are particularly important for circulating belts Tools because they only need a low voltage, which can be fed to you safely without additional protective measures. They are also for high-performance machines particularly suitable because they come from a machine standstill, when they are only connected to a basic voltage can be heated up very quickly when the machine starts up to full capacity in a short time. You can also work in rapid succession
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takten ständig in genügendem Maß Wärme zugeführt werden, so daß sie die notwendige Temperatur beibehalten können.are clocked constantly in sufficient amount of heat 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.Because of their short response time, the continuously heated belts require precise temperature control, which can be carried out by thermocouples. However, these have the disadvantage that due to the contact with the pulse band Thermocouple a heat dissipation is effected, because at the point where the thermocouple with the pulse band is connected, the heat is dissipated through the supply wires that transmit the electrical values. Hence will At this point, a lower heat is measured and the sweatband is switched on to the voltage source heated, so that the foil is overheated during welding, with the exception of the place where the thermocouple is located. Apart from that, slip rings are required to forward the values determined by the thermal sensor, whereby the device would be structurally enlarged and expensive.
Aus diesem Grund hat es nicht an Vorschlägen zur Temperatursteuerung anstelle einer Temperaturregelung von Schweißwerkzeugen, insbesondere von dauerbeheizten Schweißbändern, gefehlt. Aus der DT-AS 2 111 o24 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 Transduktors anliegt, dessen Ausgangsspannung über einen nachgeschalteten Transformator der Schweißeinrichtung zugeführt wird.Because of this, it has run out of suggestions on temperature control instead of temperature control of welding tools, especially of permanently heated welding tapes, absent. From the DT-AS 2 111 o24 is an arrangement for Control of the temperature of a welding device for welding plastic films as a function of the Throughput speed of the plastic films known through the welding device, at 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.
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Bei einer aus der DT-PS 2 1o9 321 bekannten Vorrichtung wird die Schweißtemperatur beim Schweißen von kontinuierlich, jedoch mit unterschiedlichen Geschwindigkeiten zu Werkstücken zu verarbeitenden Kunststoffbahnen dadurch gesteuert, daß die Heizspannung des Schweißbandes in vorgegebenen Geschwindigkeitsintervallen stufenweise verändert wird.In a device known from DT-PS 2 1o9 321 the welding temperature during welding is continuously, however, plastic webs to be processed at different speeds to form workpieces controlled so that the heating voltage of the sweatband changed gradually in predetermined speed intervals will.
Aus der DT-OS 2 137 576 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 DT-OS 2 137 576 there is an arrangement for the control 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 is proportional to the throughput speed The supply voltage of the supply device is controlled by successively connectable resistors.
Aus der DT-AS 1 265 183 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.From the DT-AS 1 265 183 a device for controlling the heating power of a wire or strip annealing system by means of an electric actuator as a function of the wire or belt speed known, at which the speed proportional The heating power is controlled 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 the temperature or the heating power is controlled, is in common that the heating voltage is specified by the temperature manufacturer without feedback of the actual temperature reached so that no control of the heating power or the temperature takes place.
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Aufgabe der vorliegenden Erfindung ist es, eine Vorrichtung zum Regeln der Temperatur von Schweißbändern oder dgl. zu schaffen, die die Temperatur der Bänder unabhängig von der Maschinengeschwindigkeit oder der vom Schweißband abgenommenen Wärmemenge konstant hält, ohne daß eine direkte Temperaturmessung durch Thermoelement notwendig ist.The object of the present invention is to provide a device for regulating the temperature of sweat bands or Like. To create the temperature of the tapes regardless of the machine speed or that of the sweatband keeps the amount of heat removed constant without a direct temperature measurement by thermocouple being necessary.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß im Heizstromkreis ein Stromsteller und eine dem Heizstrom proportionale Signal-Spannung abgegebende Einrichtung angeordnet sind und daß die Differenz zwischen dieser Signal-Spannung sowie einer zweiten, dem Spannungsabfall über dem Schweißband proportionalen Signal-Spannung einem Regler zugeführt wird, der über den Stromsteller den Heizstrom verändert, bis die Differenz der Signal-Spannung am Reglereingang null ist. Die erfindungsgemäße Temperaturregelung der Schweißbänder beruht darauf, daß zu der konstant zu haltenden Schweißtemperatur des Schweißbandes ein bestimmter, dieser Temperatur entsprechender Widerstand des Schweißbandes gehört, sodaß sich der Schweißstrom, der belastungsabhängig ist, also mit der Maschinengeschwindigkeit und der Wärmeabgabe von dem Schweißband ändert. Der Widerstand des Schweißbandes muß während des Schweißbetriebes auf gleicher Höhe gehalten werden, um gleiche Schweißergebnisse zu erzielen. Ein Abfallen des Widerstandes bei Entzug von Wärme wird dadurch ausgeglichen,According to the invention, this object is achieved in that a current controller and a heating current in the heating circuit proportional signal-voltage-emitting device arranged are and that the difference between this signal voltage and a second, the voltage drop across the Sweatband proportional signal voltage is fed to a controller that changes the heating current via the current controller, until the difference in the signal voltage at the controller input is zero. The inventive temperature control of the sweat bands is based on the fact that the welding temperature to be kept constant of the sweatband belongs to a certain resistance of the sweatband corresponding to this temperature, so that the welding current, which is load-dependent, i.e. with the machine speed and the heat dissipation from the Sweatband changes. The resistance of the sweatband must be kept at the same level during welding to achieve the same welding results. A drop in resistance when heat is withdrawn, this balances out,
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daß die Spannung, die am Schweißband anliegt, so weit erhöht wird, daß sie mit dem Heizstrom nach dem Ohmschen Gesetz einen Quotienten "bildet, der dem gewählten Ausgangswert gleich ist. Die erfindungsgemäße Temperaturregelung ist sehr wirksam und mit wenig Aufwand verbunden, weil es lediglich erforderlich ist, Einrichtungen vorzusehen, die der am Schweißband auftretenden Spannung und dem Heizstrom proportionale Signalspannungen abgeben, und diese Signalspannungen dem Regler zuzuführen.that the tension applied to the sweatband is so high is increased so that it forms a quotient "with the heating current according to Ohm's law, which corresponds to the selected output value is equal to. The temperature control according to the invention is very effective and requires little effort because it It is only necessary to provide devices that are able to cope with the voltage and the heating current occurring on the sweatband Output proportional signal voltages 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 unabhängig von der jeweiligen Belastung während des Schweißbetriebes den Widerstand des Schweißbandes und damit die Schweißbandtemperatur konstant.When switching on the heating current and cold sweatband flows because of the lower resistance of the sweatband a strong current that quickly brings the sweatband to operating temperature heats up. The device according to the invention then holds regardless of the respective load during the During welding operation, the resistance of the sweatband and thus the sweatband temperature remain constant.
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 bands, the invention is parallel in a further embodiment An adjustable voltage divider is connected to the sweatband, of which the voltage drop proportional to the voltage drop across the sweatband Comparison voltage is tapped.
Ein Ausführungsbeispiel der Erfindung wird nachstehend an-An embodiment of the invention is given below
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hand der Zeichnung näher erläutert. In dieser zeigt;hand of the drawing explained in more detail. In this shows;
Figur 1 ein mit Gleichstrom gespeistes Schweißband undFIG. 1 shows a sweatband fed with direct current and
Figur 2 einen an Wechselspannung anliegenden Heizstromkreis.FIG. 2 shows a heating circuit connected to AC voltage.
In Figur 1 ist ein Schweißband 1 durch Zuleitungen 2, mit dem Gleichrichter 4 verbunden, der den SollwertstellerIn FIG. 1, a sweat band 1 is connected by supply lines 2 to the rectifier 4, which controls the setpoint adjuster
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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 1o, 11, 12 und 14 weg, von denen die Leitungen 1o, 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 Potentialtrenners 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.contains, is designed as a half-controlled bridge and on the secondary winding 5 of an AC voltage source 7 adjacent transformer 6 is connected. A shunt 8 is located in line 3, parallel to the sweatband 1, a voltage divider 9 is connected for adjustment. Lines 1o lead from shunt 8 or voltage divider 9, 11, 12 and 14 away, from which the lines 1o, 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 potential separator 15 that is still free is connected to the other input of the controller 16 by a line 17. The output of the controller 16 supplies the control voltage for the controlled part via the lines 18, 19 the bridge 4.
Fig. 2 zeigt eine Regelung eines Schweißbandes 21, das aus einer Wechselspannungsquelle 27 über einen Transformator gespeist wird. Das Schweißband 21 ist durch 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 3o angeschlossen. Der Minusausgang von 29 ist durch eine Leitung 31 mit dem Minusausgang des Brückengleichrichters 3o verbunden. Die anderen Ausgänge der Brückengleichrichter 29, 3o sind durch Leitungen 32, 33 mit einem Regler 34 verbunden. Der Ausgang desFig. 2 shows a control of a sweatband 21, which from an AC voltage source 27 via a transformer is fed. The welding tape 21 is connected to the secondary winding 25 of the transformer 26 through the leads 23 the transmitter 28 connected. An alternating current controller 24 is located in the supply line 22. A voltage divider is connected to the sweatband 21 37 in parallel and this is followed by a bridge rectifier 29. The secondary winding of the transformer 28 is connected to a bridge rectifier 3o. The minus output of 29 is through a line 31 to the minus output of the bridge rectifier 3o connected. The other outputs of the bridge rectifiers 29, 3o are through lines 32, 33 are connected to a controller 34. The outcome of the
809818/06 3 6809818/06 3 6
AOAO
Reglers 34 steuert über Leitungen 35, 36 den Wechselstromsteller 24, der den Temperatur-Sollwerteinsteller enthält.Controller 34 controls via lines 35, 36 the AC power controller 24, which contains the 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 3o 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 the current required for welding when switched on flows and the sweatband 1, 21 thus reaches a certain temperature. When switched on, the sweatband is cold and the signal voltage at shunt 8 or at the bridge rectifier 3o greater than on the voltage divider 9 or on the bridge rectifier 29 of the sweatband 1 or 21. As long as If this condition 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.
8 09818/06368 09818/0636
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Le e rs e i t eRead more
Claims (2)
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)
| Publication Number | Publication Date |
|---|---|
| DE2650310A1 true DE2650310A1 (en) | 1978-05-03 |
| DE2650310B2 DE2650310B2 (en) | 1979-03-08 |
| DE2650310C3 DE2650310C3 (en) | 1981-09-03 |
Family
ID=5992323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19762650310 Expired DE2650310C3 (en) | 1976-11-02 | 1976-11-02 | Device for regulating the temperature of sweat bands lying in a heating circuit |
Country Status (5)
| Country | Link |
|---|---|
| BR (1) | BR7707267A (en) |
| DE (1) | DE2650310C3 (en) |
| FR (1) | FR2369618A1 (en) |
| GB (1) | GB1566971A (en) |
| IT (1) | IT1087276B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9207372U1 (en) * | 1991-05-30 | 1992-10-15 | HÖFT, Alois | Device for closing plastic ampoules |
Families Citing this family (1)
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1908769A1 (en) * | 1968-02-20 | 1969-09-11 | Quickfit & Quartz Ltd | Method and electrical control circuit for regulating an electrical resistance path to an adjustable constant temperature |
| DE2408475A1 (en) * | 1974-02-22 | 1975-09-04 | Zenglein Otmar | Controlling temp of plastics welding bars - measuring temp of bar by establishing current flow or volt drop and setting time of current flow |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54106410U (en) * | 1978-01-12 | 1979-07-26 |
-
1976
- 1976-11-02 DE DE19762650310 patent/DE2650310C3/en not_active Expired
-
1977
- 1977-10-19 FR FR7731408A patent/FR2369618A1/en active Pending
- 1977-10-24 IT IT2890477A patent/IT1087276B/en active
- 1977-10-26 GB GB4456877A patent/GB1566971A/en not_active Expired
- 1977-10-31 BR BR7707267A patent/BR7707267A/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1908769A1 (en) * | 1968-02-20 | 1969-09-11 | Quickfit & Quartz Ltd | Method and electrical control circuit for regulating an electrical resistance path to an adjustable constant temperature |
| DE2408475A1 (en) * | 1974-02-22 | 1975-09-04 | Zenglein Otmar | Controlling temp of plastics welding bars - measuring temp of bar by establishing current flow or volt drop and setting time of current flow |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9207372U1 (en) * | 1991-05-30 | 1992-10-15 | HÖFT, Alois | Device for closing plastic ampoules |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1566971A (en) | 1980-05-08 |
| DE2650310C3 (en) | 1981-09-03 |
| FR2369618A1 (en) | 1978-05-26 |
| BR7707267A (en) | 1978-07-25 |
| IT1087276B (en) | 1985-06-04 |
| DE2650310B2 (en) | 1979-03-08 |
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|---|---|---|---|
| OAM | Search report available | ||
| OAP | Request for examination filed | ||
| OC | Search report available | ||
| OD | Request for examination | ||
| C3 | Grant after two publication steps (3rd publication) | ||
| 8339 | Ceased/non-payment of the annual fee |