EP2935071B1 - Lift assembly with monitoring device and method for monitoring a lift assembly - Google Patents

Lift assembly with monitoring device and method for monitoring a lift assembly Download PDF

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Publication number
EP2935071B1
EP2935071B1 EP13802043.3A EP13802043A EP2935071B1 EP 2935071 B1 EP2935071 B1 EP 2935071B1 EP 13802043 A EP13802043 A EP 13802043A EP 2935071 B1 EP2935071 B1 EP 2935071B1
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Prior art keywords
tension members
tensile carriers
support means
measuring bridge
suspension element
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EP13802043.3A
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German (de)
French (fr)
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EP2935071A1 (en
Inventor
Florian Dold
Volker Zapf
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Inventio AG
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Inventio AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B7/00—Other common features of elevators
    • B66B7/12—Checking, lubricating, or cleaning means for ropes, cables or guides
    • B66B7/1207—Checking means
    • B66B7/1215—Checking means specially adapted for ropes or cables
    • B66B7/1223—Checking means specially adapted for ropes or cables by analysing electric variables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B7/00—Other common features of elevators
    • B66B7/06—Arrangements of ropes or cables
    • B66B7/062—Belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B7/00—Other common features of elevators
    • B66B7/06—Arrangements of ropes or cables
    • B66B7/064—Power supply or signal cables

Definitions

  • the present invention relates to an elevator installation with a monitoring device for a suspension element, and to a method for determining a state of a suspension element in an elevator installation.
  • a test current can be applied to the tension members.
  • a current flow, a voltage, an electrical resistance or an electrical conductivity is measured.
  • a size measured in this way it is possible to deduce an integrity or a degree of wear of the suspension element. Namely, reduces the diameter of a tension member by fractures of individual wires or by metallic abrasion, the electrical resistance of this tension member increases.
  • the publication WO 2012/030332 A1 discloses an elevator installation with a cabin and at least one suspension element, wherein the cabin is at least partially supported by the suspension element, and wherein the suspension element comprises a plurality of mutually parallel electrically conductive tension members, which are substantially enveloped by a jacket, the elevator installation further comprising a monitoring device, which interconnects the tension members as electrical resistors in a measuring bridge, so that electrical resistances of different tension members can be compared with one another using a bridge voltage and a method for determining a condition of at least one suspension element in an elevator installation, the elevator installation comprising a cabin and at least one suspension element, wherein the cabin from Supporting means is at least partially supported, and wherein the support means comprises a plurality of mutually parallel electrically conductive tension members, which are substantially surrounded by a jacket, the method comprising the Steps: - Connecting the tension members to electrical resistors in a measuring bridge; and - Determining a state of the support means by comparing the electrical resistances of the tension
  • the publication DE3934654A1 discloses, for example, a serial connection of all individual tension members and an ammeter, wherein it is checked whether an electric current flows through the series-connected tension members. As a result, it can be determined whether one of the tension members is interrupted at one point.
  • the patent US7123030B2 discloses a calculation of an electrical resistance by a measurement of a current voltage by means of a Kelvin bridge and a comparison of the thus determined voltage value with an input reference value.
  • the publication font WO2005 / 094250A2 discloses a temperature dependent measurement of electrical resistance or electrical conductivity in which the takes into account different ambient and thus also accepted carrier temperature, which can be very different, especially in high elevator shafts.
  • WO2003 / 059798A2 discloses a belt-type suspension element for elevator installations. It can be concluded by a determination of an electrical resistance of the tension member of the support means to a load of the support means, and thus to a loading of the cabin. In addition, breakage of tension members can also be detected by the resistance measurement when an infinitely high resistance is detected. For example, a Wheatstone bridge can be used to determine the resistance.
  • an elevator installation with a cabin and at least one suspension element wherein the cabin is at least partially supported by the suspension element, and wherein the suspension element comprises a plurality of mutually parallel electrically conductive tension members, which are substantially surrounded by a jacket.
  • the elevator installation further comprises a monitoring device which detects the tension members or groups of tension members as electrical resistances changing constellation connected in a measuring bridge, so that electrical resistances of different tension members or groups of tension members are comparable to each other based on a bridge voltage.
  • Such an elevator system initially appears disadvantageous because no absolute values are available for the assessment of a suspension element state.
  • a device makes it possible to make a qualitative statement about the state of the tension members of the suspension element, which is not distorted by environmental influences such as temperature, humidity or magnetic fields. This is achieved by a comparison of tension members, which are exposed to substantially identical environmental influences.
  • An interconnection of the tension members as electrical resistors in a measuring bridge also has the advantage that a corresponding monitoring device can be produced inexpensively and is also robust in use.
  • the bridge voltage as an indicator of the state of the support means is an easy-to-assess and also easy to determine parameters available. As a result, the monitoring of the suspension is significantly simplified, and distorted readings and interpretation errors can be largely eliminated.
  • An interconnection of the tension members or groups of tension members in alternating constellation to electrical resistances in the measuring bridge has the advantage that each tension member or each group of tension members can be compared with a number of other tension members or groups of tension members. This increases the information about the condition of individual tension members or groups of tension members, because this also enables similar defects to be reliably detected with different tension members or groups of tension members.
  • a single tension member is connected as an electrical resistance in the measuring bridge.
  • a plurality of tension members of a single suspension element can be connected to one another in a measuring bridge, or tensile carriers of different suspension elements of the elevator installation can be connected to one another in a measuring bridge.
  • Such an interconnection of the tension members has the advantage that each individual tension member of a suspension element is checked for its condition can.
  • such an interconnection requires a series of measurements in order to check all tension members of all suspension elements of an elevator installation.
  • a plurality of tension members of a suspension element are interconnected as a group as an electrical resistance in the measuring bridge.
  • several groups of tension members of a single suspension element can be connected to one another in a measuring bridge, or groups of tension members of different suspension elements of the elevator installation can be connected to one another in a measuring bridge.
  • Such an interconnection of the tension members has the advantage that fewer measuring operations are necessary in order to check all tension members of all suspension elements of an elevator installation.
  • all tensile carriers of a suspension element are interconnected as a group as an electrical resistance in the measuring bridge.
  • Such an interconnection of the tension members has the advantage that the individual tension members of a suspension element do not necessarily have to be contacted individually, but can be contacted as an entire group. This significantly simplifies the electrical contacting of the tension members. However, it is not possible with such a type of electrical contacting or interconnection of the tension members to provide information about a single tension member of a suspension element.
  • the tensile carriers of a group are each interconnected in series, thus forming an electrical resistance in the measuring bridge.
  • the tension members of a group are each connected in parallel with one another, thus forming an electrical resistance in the measuring bridge.
  • one or the other interconnection may be advantageous. It should be ensured that damage to the tension members, which result in a change in the electrical resistance of the tension members are reliably detected.
  • an interconnection can be optimally adapted to the conditions here.
  • four electrical resistances are comprised of interconnected one or more tension members in a Wheatstone bridge.
  • a Wheatstone bridge has the advantage that a deviating electrical resistance can be reliably determined by a determination of the bridge voltage. This ensures a reliable detection of a defective tension member or a group of defective tension members.
  • no absolute electrical resistance values of the tension members or the groups of tension members can be determined by the monitoring device.
  • Such an embodiment of the monitoring device has the advantage that the monitoring device is inexpensive and easy to manufacture.
  • the elevator installation in this case comprises a cabin and at least one suspension element, wherein the cabin is at least partially supported by the suspension element, and wherein the suspension element comprises a plurality of mutually parallel electrically conductive tension members, which are substantially enveloped by a jacket.
  • the method comprises the steps: interconnecting the tension members or groups of tension members in alternating constellation to electrical resistances in a measuring bridge; and determining a state of the suspension element by comparing the electrical resistances of the tensile carriers or groups of tensile carriers by means of a bridge voltage.
  • Such a method is initially disadvantageous because no absolute values are available for the evaluation of the measurement results.
  • the method makes it possible to make a qualitative statement about the state of the tension members of the suspension element, which is not distorted by environmental influences such as temperature, humidity or magnetic fields. This is achieved by a comparison of tension members, which are exposed to substantially identical environmental influences. Thus, a condition of the suspension element can be better estimated.
  • the interconnection of the tension members or the groups of tension members in alternating constellation has the advantage that by comparing a tension member or a group of tension members with a larger number of tension members or groups of tension members a better statement about the condition of the individual tension member or . of the
  • Group of tension members can be made.
  • each individual tensile carriers form an electrical resistance in the measuring bridge.
  • several or all tensile carriers of a suspension element form an electrical resistance in the measuring bridge.
  • the electrical resistance of each tension member or group of tension members of the elevator installation is compared with electrical resistances of at least three other tension members or three other groups of tension members.
  • no absolute resistance values of the tension members or the groups of tension members are determined.
  • Such a method in turn has the advantage that it does not require unnecessarily many parameters to be measured and evaluated. This prevents the risk of measurement errors and misinterpretations of measurement results.
  • the determination of a condition of a suspension element disclosed here or the monitoring device disclosed here can be used in different types of elevator installations.
  • elevator systems with or without shaft, with or without counterweight, or elevator systems with different gear ratios can be used.
  • each belt-type suspension element in an elevator installation, which carries a car can be monitored with the method or device disclosed here.
  • FIG. 1 schematically illustrated lift system 40 includes an elevator car 41, a counterweight 42 and a support means 1 and a traction sheave 43 with associated drive motor 44.
  • the traction sheave 43 drives the support means 1 and thus moves the elevator car 41 and the counterweight 42 gegentechnisch.
  • the drive motor 44 is controlled by an elevator control 45.
  • the cabin 41 is designed to receive people or goods and to transport between floors of a building. Cabin 41 and counterweight 42 are guided along guides (not shown). In the example, the cabin 41 and the counterweight 42 are each suspended on support rollers 46.
  • the support means 1 is fastened to a first support means fastening device 47, and then first guided around the support roller 46 of the counterweight 42.
  • the suspension element 1 is placed over the traction sheave 43, guided around the support roller 46 of the cabin 41, and finally connected by a second suspension means fastening device 47 with a fixed point.
  • the wrap factor is 2: 1.
  • a loose end 1.1 of the suspension element 1 is provided with a contacting device 2 for temporary or permanent electrical contacting of the tension members and thus for monitoring the suspension element 1.
  • a contacting device 2 is arranged at both ends 1.1 of the suspension element 1.
  • only one contacting device 2 is arranged on one of the support means ends 1.1, and the tension members on the other support means end 1.1 are electrically connected to each other.
  • the support means ends 1.1 are no longer burdened by the tensile force in the suspension element 1, since this tensile force already prevail is passed over the suspension means fasteners 47 in the building.
  • the contacting devices 2 are thus arranged in a non-overrun area of the suspension element 1 and outside the loaded area of the suspension element 1.
  • the contacting device 2 is connected at one end of the support means 1.1 with a monitoring device 3.
  • the monitoring device 3 interconnects the tension members of the suspension element 1 as electrical resistors in a measuring bridge.
  • the electrical resistances of different tension members are comparable to one another on the basis of a bridge tension determined by the monitoring device 3.
  • the monitoring device 3 is also connected to the elevator control 45.
  • a signal or a measured value can be transmitted from the monitoring device 3 to the elevator control 45 in order to take into account the state of the suspension element 1 as determined by the monitoring device 3 in a control of the elevator 40.
  • the elevator installation 40 shown in FIG. 1 is exemplary. Other capping factors and arrangements, such as counterbalanced lift systems, are possible.
  • the contacting device 2 for contacting the support means 1 is then arranged according to the placement of the support means fastening devices 47.
  • the support means 1 comprises a plurality of mutually parallel electrically conductive tension members 5, which are enveloped by a jacket 6.
  • the jacket 6 can be pierced or removed, for example, or the tension members 5 can also be electrically contacted on the face side by a contacting device 2.
  • the suspension element is equipped with longitudinal ribs on a traction side. Such longitudinal ribs improve a traction of the support means 1 on the traction sheave 43 and also facilitate lateral guidance of the support means 1 on the traction sheave 43.
  • the support means 1 can also be designed differently, for example without longitudinal ribs, or with a different number or different arrangement of the tension members 5. It is essential for the invention that the tension members 5 are designed to be electrically conductive.
  • measuring bridges 12 are shown schematically.
  • electrical resistors 14 are interconnected to a measuring bridge 12.
  • a voltage source 13 provides a total voltage across the measuring bridge 12, and a bridge voltage 15 can be used as a parameter for equality or diversity of the electrical resistors 14.
  • tensile carriers 5 of a suspension element 1 are used individually or in groups as electrical resistors 14 in a measuring bridge 12, information about the state of the tension members 5 and thus of the suspension element 1 can be obtained by evaluating the bridge tension 15.
  • FIG. 3a a Wheatstone bridge 12 is shown.
  • Four electrical resistors 14 are interconnected in such a way that the bridge voltage 15 is zero when all four electrical resistors 14 are the same size.
  • FIG. 3b a measuring bridge 12 is shown in which two electrical resistors 14 are connected in parallel and form a group. A total of four such groups form the measuring bridge 12, in which in turn the bridge voltage 15 can be used as a measure of the equality of the electrical resistors 14.
  • Figure 3c a measuring bridge 12 is shown, in which eight electrical resistors 14 are connected.
  • a bridge voltage 15 can be determined at several locations. Again, the bridge voltage 15 can be used as a measure of the equality of the electrical resistors 14.
  • the measuring bridges shown here are examples of a suitable measuring bridge for determining a condition of a suspension element. It goes without saying that different types of measuring bridges can be used to achieve the same technical effect. For example, a three-quarter or one half-bridge can be used. Thus, depending on the configuration of the elevator installation or the suspension element, a suitable measuring bridge can be selected.

Landscapes

  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Indicating And Signalling Devices For Elevators (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Description

Die vorliegende Erfindung betrifft eine Aufzugsanlage mit einer Überwachungsvorrichtung für ein Tragmittel, sowie ein Verfahren zur Bestimmung eines Zustandes eines Tragmittels in einer Aufzugsanlage.The present invention relates to an elevator installation with a monitoring device for a suspension element, and to a method for determining a state of a suspension element in an elevator installation.

Bei Aufzugsanlagen wurden zum Tragen und / oder Antreiben einer Aufzugskabine herkömmlicherweise Stahlseile als Tragmittel eingesetzt. Gemäss einer Weiterentwicklung solcher Stahlseile werden auch riemenartige Tragmittel, welche Zugträger und eine um die Zugträger angeordnete Ummantelung aufweisen, eingesetzt. Solche riemenartigen Tragmittel lassen sich jedoch nicht auf herkömmliche Art überwachen, weil die Zugträger, welche eine Bruchlast des Tragmittels bestimmen, nicht sichtbar sind durch die Ummantelung.In elevator systems, steel cables have traditionally been used as support means for carrying and / or driving an elevator car. According to a further development of such steel cables, belt-type suspension elements which have tension members and a jacket arranged around the tension members are also used. However, such belt-like support means can not be monitored in a conventional manner, because the tension members, which determine a breaking load of the suspension element, are not visible through the sheath.

Zur Überwachung solcher Zugträger in riemenartigen Tragmitteln kann ein Prüfstrom an die Zugträger angelegt werden. In dem so gebildeten Stromkreis oder in mehreren so gebildeten Stromkreisen wird ein Stromfluss bzw. eine Stromstärke, eine Spannung, ein elektrischer Widerstand oder eine elektrische Leitfähigkeit gemessen. Anhand einer derart gemessenen Grösse kann auf eine Intaktheit bzw. einen Abnützungsgrad des Tragmittels zurückgeschlossen werden. Verringert sich nämlich der Durchmesser eines Zugträgers durch Brüche einzelner Drähte oder durch metallischen Abrieb, wächst der elektrische Widerstand dieses Zugträgers an.To monitor such tension members in belt-like suspension means, a test current can be applied to the tension members. In the circuit thus formed or in a plurality of circuits thus formed, a current flow, a voltage, an electrical resistance or an electrical conductivity is measured. On the basis of a size measured in this way, it is possible to deduce an integrity or a degree of wear of the suspension element. Namely, reduces the diameter of a tension member by fractures of individual wires or by metallic abrasion, the electrical resistance of this tension member increases.

Die Offenlegungsschrift WO 2012/030332 A1 offenbart eine Aufzugsanlage mit einer Kabine und mindestens einem Tragmittel, wobei die Kabine vom Tragmittel zumindest teilweise getragen ist, und wobei das Tragmittel mehrere parallel zueinander angeordnete elektrisch leitende Zugträger umfasst, welche im Wesentlichen von einem Mantel umhüllt sind, die Aufzugsanlage umfassend weiter eine Überwachungsvorrichtung, welche die Zugträger als elektrische Widerstände in einer Messbrücke verschaltet, sodass elektrische Widerstände verschiedener Zugträger anhand einer Brückenspannung miteinander vergleichbar sind und ein Verfahren zur Bestimmung eines Zustandes mindestens eines Tragmittels in einer Aufzugsanlage, die Aufzugsanlage umfassend eine Kabine und mindestens ein Tragmittel, wobei die Kabine vom Tragmittel zumindest teilweise getragen ist, und wobei das Tragmittel mehrere parallel zueinander angeordnete elektrisch leitende Zugträger umfasst, welche im Wesentlichen von einem Mantel umhüllt sind, das Verfahren umfassend die Schritte: - Verschalten der Zugträger zu elektrischen Widerständen in einer Messbrücke; und - Ermitteln eines Zustandes des Tragmittels durch einen Vergleich der elektrischen Widerstände der Zugträger anhand einer Brückenspannung. Die Offenlegungsschrift DE3934654A1 offenbart beispielsweise eine serielle Verbindung aller einzelnen Zugträger und ein Amperemeter, wobei überprüft wird, ob ein elektrischer Strom durch die in Serie geschalteten Zugträger fliesst. Dadurch kann festgestellt werden, ob einer der Zugträger an einer Stelle unterbrochen ist.The publication WO 2012/030332 A1 discloses an elevator installation with a cabin and at least one suspension element, wherein the cabin is at least partially supported by the suspension element, and wherein the suspension element comprises a plurality of mutually parallel electrically conductive tension members, which are substantially enveloped by a jacket, the elevator installation further comprising a monitoring device, which interconnects the tension members as electrical resistors in a measuring bridge, so that electrical resistances of different tension members can be compared with one another using a bridge voltage and a method for determining a condition of at least one suspension element in an elevator installation, the elevator installation comprising a cabin and at least one suspension element, wherein the cabin from Supporting means is at least partially supported, and wherein the support means comprises a plurality of mutually parallel electrically conductive tension members, which are substantially surrounded by a jacket, the method comprising the Steps: - Connecting the tension members to electrical resistors in a measuring bridge; and - Determining a state of the support means by comparing the electrical resistances of the tension members by means of a bridge voltage. The publication DE3934654A1 discloses, for example, a serial connection of all individual tension members and an ammeter, wherein it is checked whether an electric current flows through the series-connected tension members. As a result, it can be determined whether one of the tension members is interrupted at one point.

Das Patent US7123030B2 offenbart eine Berechnung eines elektrischen Widerstandes durch eine Messung einer aktuellen Spannung mittels einer Kelvinbrücke und einen Vergleich des so ermittelten Spannungswertes mit einem eingegebenen Referenzwert. Die Veröffentlichungsschrift WO2005/094250A2 offenbart eine temperaturabhängige Messung des elektrischen Widerstands oder der elektrischen Leitfähigkeit, in der die unterschiedliche Umgebungs- und somit auch angenommene Tragmitteltemperatur Berücksichtigung findet, die insbesondere in hohen Aufzugsschächten sehr unterschiedlich sein kann.The patent US7123030B2 discloses a calculation of an electrical resistance by a measurement of a current voltage by means of a Kelvin bridge and a comparison of the thus determined voltage value with an input reference value. The publication font WO2005 / 094250A2 discloses a temperature dependent measurement of electrical resistance or electrical conductivity in which the takes into account different ambient and thus also accepted carrier temperature, which can be very different, especially in high elevator shafts.

WO2003/059798A2 offenbart ein riemenartiges Tragmittel für Aufzugsanlagen. Dabei kann durch eine Bestimmung eines elektrischen Widerstandes der Zugträger des Tragmittels auf eine Belastung des Tragmittels, und somit auf eine Beladung der Kabine geschlossen werden. Zudem können durch die Widerstandsmessung auch Brüche von Zugträgers festgestellt werden, wenn ein unendlich hoher Widerstand festgestellt wird. Zur Bestimmung des Widerstandes kann beispielsweise eine Wheatstonesche Messbrücke verwendet werden. WO2003 / 059798A2 discloses a belt-type suspension element for elevator installations. It can be concluded by a determination of an electrical resistance of the tension member of the support means to a load of the support means, and thus to a loading of the cabin. In addition, breakage of tension members can also be detected by the resistance measurement when an infinitely high resistance is detected. For example, a Wheatstone bridge can be used to determine the resistance.

Bei all diesen bekannten Überwachungen des Tragmittels ist jedoch nachteilig, dass Umwelteinflüsse, welche den elektrischen Widerstand eines Zugträgers beeinflussen, nur ungenügend berücksichtigt werden. So haben neben der Temperatur auch andere Faktoren einen Einfluss auf die Leitfähigkeit der Zugträger, wie beispielsweise magnetische Felder oder die Luftfeuchtigkeit. Die bekannten Überwachungen liefern daher keine verlässlichen Angaben zum Zustand des Tragmittels.In all these known monitoring of the suspension means, however, is disadvantageous that environmental influences, which affect the electrical resistance of a tension member, are considered insufficient. In addition to the temperature, other factors have an influence on the conductivity of the tensile carriers, such as magnetic fields or humidity. The known monitors therefore provide no reliable information about the condition of the suspension.

Es ist daher eine Aufgabe der vorliegenden Erfindung, ein Verfahren zur Bestimmung eines Zustandes eines Tragmittels bereitzustellen, welches verschiedene Umwelteinflüsse auf die elektrische Leitfähigkeit der Zugträger berücksichtigt, und welches kostengünstig und robust im Gebrauch ist. Zudem ist es eine Aufgabe der vorliegenden Erfindung, eine Aufzugsanlage mit einer Überwachungsvorrichtung zur Überwachung eines Tragmittels zur Verfügung zu stellen, wobei bei einer Bestimmung eines Tragmittelzustandes verschiedene Umwelteinflüsse auf die elektrische Leitfähigkeit der Zugträger des Tragmittels berücksichtigt werden.It is therefore an object of the present invention to provide a method for determining a state of a suspension, which takes into account various environmental influences on the electrical conductivity of the tension members, and which is inexpensive and robust in use. In addition, it is an object of the present invention to provide an elevator installation with a monitoring device for monitoring a suspension element, wherein, when determining a suspension element state, various environmental influences on the electrical conductivity of the tension members of the suspension element are taken into account.

Zur Lösung dieser Aufgabe wird zunächst eine Aufzugsanlage mit einer Kabine und mindestens einem Tragmittel vorgeschlagen, wobei die Kabine vom Tragmittel zumindest teilweise getragen ist, und wobei das Tragmittel mehrere parallel zueinander angeordnete elektrisch leitende Zugträger umfasst, welche im Wesentlichen von einem Mantel umhüllt sind. Die Aufzugsanlage umfasst weiter eine Überwachungsvorrichtung, welche die Zugträger oder Gruppen von Zugträgern als elektrische Widerstände in wechselnder Konstellation in einer Messbrücke verschaltet, so dass elektrische Widerstände verschiedener Zugträger oder Gruppen von Zugträgern anhand einer Brückenspannung miteinander vergleichbar sind.To solve this problem, an elevator installation with a cabin and at least one suspension element is first proposed, wherein the cabin is at least partially supported by the suspension element, and wherein the suspension element comprises a plurality of mutually parallel electrically conductive tension members, which are substantially surrounded by a jacket. The elevator installation further comprises a monitoring device which detects the tension members or groups of tension members as electrical resistances changing constellation connected in a measuring bridge, so that electrical resistances of different tension members or groups of tension members are comparable to each other based on a bridge voltage.

Eine solche Aufzugsanlage erscheint zunächst nachteilig, weil keine absoluten Werte für die Beurteilung eines Tragmittelzustandes zur Verfügung stehen. Eine solche Vorrichtung erlaubt es jedoch, eine qualitative Aussage über den Zustand der Zugträger des Tragmittels zu erstellen, welche nicht durch Umwelteinflüsse wie Temperatur, Luftfeuchtigkeit oder magnetische Felder verfälscht wird. Dies wird erreicht durch einen Vergleich von Zugträgern, welche im Wesentlichen identischen Umwelteinflüssen ausgesetzt werden. Somit kann der Zustand des Tragmittels mit der hier vorgeschlagenen Vorrichtung besser eingeschätzt werden.
Eine Verschaltung der Zugträger als elektrische Widerstände in einer Messbrücke hat zudem den Vorteil, dass eine entsprechende Überwachungsvorrichtung kostengünstig herstellbar ist und zudem robust in der Anwendung ist. Zudem steht mit der Brückenspannung als Indikator für den Zustand des Tragmittels ein einfach zu beurteilender und zudem einfach zu bestimmender Parameter zur Verfügung. Dadurch wird die Überwachung des Tragmittels massgeblich vereinfacht, und verfälschte Messwerte sowie Interpretationsfehler können weitgehend ausgeschaltet werden.Such an elevator system initially appears disadvantageous because no absolute values are available for the assessment of a suspension element state. However, such a device makes it possible to make a qualitative statement about the state of the tension members of the suspension element, which is not distorted by environmental influences such as temperature, humidity or magnetic fields. This is achieved by a comparison of tension members, which are exposed to substantially identical environmental influences. Thus, the condition of the suspension element with the device proposed here can be better estimated.
An interconnection of the tension members as electrical resistors in a measuring bridge also has the advantage that a corresponding monitoring device can be produced inexpensively and is also robust in use. In addition, with the bridge voltage as an indicator of the state of the support means is an easy-to-assess and also easy to determine parameters available. As a result, the monitoring of the suspension is significantly simplified, and distorted readings and interpretation errors can be largely eliminated.

Eine Verschaltung der Zugträger oder Gruppen von Zugträgern in wechselnder Konstellation zu elektrischen Widerständen in der Messbrücke hat den Vorteil, dass jeder Zugträger bzw. jede Gruppe von Zugträgern mit einer Anzahl von anderen Zugträgern bzw. Gruppen von Zugträgern verglichen werden kann. Dies erhöht eine Aussagekraft über den Zustand einzelner Zugträger bzw. Gruppen von Zugträgern, weil dadurch auch ähnlich starke Defekte bei verschiedenen Zugträgern bzw. Gruppen von Zugträgern zuverlässig erkannt werden können.An interconnection of the tension members or groups of tension members in alternating constellation to electrical resistances in the measuring bridge has the advantage that each tension member or each group of tension members can be compared with a number of other tension members or groups of tension members. This increases the information about the condition of individual tension members or groups of tension members, because this also enables similar defects to be reliably detected with different tension members or groups of tension members.

In einer beispielhaften Ausführungsform ist jeweils ein einzelner Zugträger als ein elektrischer Widerstand in der Messbrücke verschaltet. Dabei können mehrere Zugträger eines einzigen Tragmittels miteinander in einer Messbrücke verschaltet sein, oder es können Zugträger verschiedener Tragmittel der Aufzugsanlage miteinander in einer Messbrücke verschaltet sein. Eine solche Verschaltung der Zugträger hat den Vorteil, dass jeder einzelne Zugträger eines Tragmittels auf seinen Zustand überprüft werden kann. Eine solche Verschaltung erfordert jedoch eine Reihe von Messungen, um alle Zugträger aller Tragmittel einer Aufzugsanlage zu überprüfen.In an exemplary embodiment, in each case a single tension member is connected as an electrical resistance in the measuring bridge. In this case, a plurality of tension members of a single suspension element can be connected to one another in a measuring bridge, or tensile carriers of different suspension elements of the elevator installation can be connected to one another in a measuring bridge. Such an interconnection of the tension members has the advantage that each individual tension member of a suspension element is checked for its condition can. However, such an interconnection requires a series of measurements in order to check all tension members of all suspension elements of an elevator installation.

In einer beispielhaften Ausführungsform sind jeweils mehrere Zugträger eines Tragmittels als Gruppe als ein elektrischer Widerstand in der Messbrücke verschaltet. Dabei können mehrere Gruppen von Zugträger eines einzigen Tragmittels miteinander in einer Messbrücke verschaltet sein, oder es können Gruppen von Zugträger verschiedener Tragmittel der Aufzugsanlage miteinander in einer Messbrücke verschaltet sein. Eine solche Verschaltung der Zugträger hat den Vorteil, dass weniger Messvorgänge notwendig sind, um alle Zugträger aller Tragmittel einer Aufzugsanlage zu überprüfen. Durch eine geeignete Bündelung der Zugträger zu Gruppen kann so eine effiziente Überwachung der Tragmittel erreicht werden.In an exemplary embodiment, in each case a plurality of tension members of a suspension element are interconnected as a group as an electrical resistance in the measuring bridge. In this case, several groups of tension members of a single suspension element can be connected to one another in a measuring bridge, or groups of tension members of different suspension elements of the elevator installation can be connected to one another in a measuring bridge. Such an interconnection of the tension members has the advantage that fewer measuring operations are necessary in order to check all tension members of all suspension elements of an elevator installation. By a suitable bundling of the tension members into groups, an efficient monitoring of the suspension elements can thus be achieved.

In einer beispielhaften Ausführungsform sind jeweils alle Zugträger eines Tragmittels als Gruppe als ein elektrischer Widerstand in der Messbrücke verschaltet. Eine solche Verschaltung der Zugträger hat den Vorteil, dass die einzelnen Zugträger eines Tragmittels nicht zwingend einzeln kontaktiert werden müssen, sondern als gesamte Gruppe kontaktiert werden können. Dies vereinfacht die elektrische Kontaktierung der Zugträger wesentlich. Allerdings ist es bei einer solchen Art der elektrischen Kontaktierung bzw. Verschaltung der Zugträger nicht möglich, eine Aussage über einen einzelnen Zugträger eines Tragmittels zu erstellen.In an exemplary embodiment, all tensile carriers of a suspension element are interconnected as a group as an electrical resistance in the measuring bridge. Such an interconnection of the tension members has the advantage that the individual tension members of a suspension element do not necessarily have to be contacted individually, but can be contacted as an entire group. This significantly simplifies the electrical contacting of the tension members. However, it is not possible with such a type of electrical contacting or interconnection of the tension members to provide information about a single tension member of a suspension element.

In einer beispielhaften Ausführungsform sind die Zugträger einer Gruppe jeweils in Serie miteinander verschaltet, und bilden so einen elektrischen Widerstand in der Messbrücke. In einer alternativen Ausführungsform sind die Zugträger einer Gruppe jeweils parallel miteinander verschaltet, und bilden so einen elektrischen Widerstand in der Messbrücke. Je nach Ausgestaltung des Tragmittels, das heisst beispielsweise je nach Material und Durchmesser der Zugträger eines Tragmittels, kann die eine oder die andere Verschaltung vorteilhaft sein. Es sollte dabei darauf geachtet werden, dass Schäden an den Zugträgern, welche in einer Änderung des elektrischen Widerstandes der Zugträger resultieren, zuverlässig erkannt werden. Je nach Art der Messbrücke und je nach Ausgestaltung der Zugträger kann hier eine Verschaltung optimal an die Verhältnisse angepasst werden.In an exemplary embodiment, the tensile carriers of a group are each interconnected in series, thus forming an electrical resistance in the measuring bridge. In an alternative embodiment, the tension members of a group are each connected in parallel with one another, thus forming an electrical resistance in the measuring bridge. Depending on the design of the suspension element, that is, for example, depending on the material and diameter of the tension members of a suspension element, one or the other interconnection may be advantageous. It should be ensured that damage to the tension members, which result in a change in the electrical resistance of the tension members are reliably detected. Depending on the type of measuring bridge and depending on the design of the tension members, an interconnection can be optimally adapted to the conditions here.

In einer beispielhaften Ausführungsform sind vier elektrische Widerstände bestehend aus einem oder mehreren Zugträgern in einer Wheatstoneschen Messbrücke verschaltet. Eine solche Wheatstonesche Messbrücke hat den Vorteil, dass durch eine Bestimmung der Brückenspannung zuverlässig ein abweichender elektrischer Widerstand festgestellt werden kann. Dadurch wird eine zuverlässige Erkennung eines defekten Zugträgers bzw. einer Gruppe von defekten Zugträgern gewährleistet.In an exemplary embodiment, four electrical resistances are comprised of interconnected one or more tension members in a Wheatstone bridge. Such a Wheatstone bridge has the advantage that a deviating electrical resistance can be reliably determined by a determination of the bridge voltage. This ensures a reliable detection of a defective tension member or a group of defective tension members.

In einer beispielhaften Ausführungsform sind durch die Überwachungsvorrichtung keine absoluten elektrischen Widerstandswerte der Zugträger bzw. der Gruppen von Zugträgern bestimmbar. Eine solche Ausgestaltung der Überwachungsvorrichtung hat den Vorteil, dass die Überwachungsvorrichtung kostengünstig und einfach herzustellen ist.In an exemplary embodiment, no absolute electrical resistance values of the tension members or the groups of tension members can be determined by the monitoring device. Such an embodiment of the monitoring device has the advantage that the monitoring device is inexpensive and easy to manufacture.

Zur Lösung der eingangs gestellten Aufgabe wird zudem ein Verfahren zur Bestimmung eines Zustandes mindestens eines Tragmittels in einer Aufzugsanlage vorgeschlagen. Die Aufzugsanlage umfasst dabei eine Kabine und mindestens ein Tragmittel, wobei die Kabine vom Tragmittel zumindest teilweise getragen ist, und wobei das Tragmittel mehrere parallel zueinander angeordnete elektrisch leitende Zugträger umfasst, welche im Wesentlichen von einem Mantel umhüllt sind. Das Verfahren umfasst die Schritte: Verschalten der Zugträger oder Gruppen von Zugträgern in wechselnder Konstellation zu elektrischen Widerständen in einer Messbrücke; und Ermitteln eines Zustandes des Tragmittels durch einen Vergleich der elektrischen Widerstände der Zugträger oder Gruppen von Zugträgern anhand einer Brückenspannung.In order to solve the problem set out above, a method is also proposed for determining a state of at least one suspension element in an elevator installation. The elevator installation in this case comprises a cabin and at least one suspension element, wherein the cabin is at least partially supported by the suspension element, and wherein the suspension element comprises a plurality of mutually parallel electrically conductive tension members, which are substantially enveloped by a jacket. The method comprises the steps: interconnecting the tension members or groups of tension members in alternating constellation to electrical resistances in a measuring bridge; and determining a state of the suspension element by comparing the electrical resistances of the tensile carriers or groups of tensile carriers by means of a bridge voltage.

Ein solches Verfahren ist zunächst nachteilig, weil keine absoluten Werte für die Auswertung der Messresultate zur Verfügung stehen. Das Verfahren erlaubt es jedoch, eine qualitative Aussage über den Zustand der Zugträger des Tragmittels zu erstellen, welche nicht durch Umwelteinflüsse wie Temperatur, Luftfeuchtigkeit oder magnetische Felder verfälscht wird. Dies wird erreicht durch einen Vergleich von Zugträgern, welche im Wesentlichen identischen Umwelteinflüssen ausgesetzt sind. Somit kann ein Zustand des Tragmittels besser eingeschätzt werden.Such a method is initially disadvantageous because no absolute values are available for the evaluation of the measurement results. However, the method makes it possible to make a qualitative statement about the state of the tension members of the suspension element, which is not distorted by environmental influences such as temperature, humidity or magnetic fields. This is achieved by a comparison of tension members, which are exposed to substantially identical environmental influences. Thus, a condition of the suspension element can be better estimated.

Die Verschaltung der Zugträger bzw. der Gruppen von Zugträgern in wechselnder Konstellation hat den Vorteil, dass durch den Vergleich eines Zugträgers bzw. einer Gruppe von Zugträgern mit einer grösseren Anzahl von Zugträgern bzw. Gruppen von Zugträgern eine bessere Aussage über den Zustand des einzelnen Zugträgers bzw. derThe interconnection of the tension members or the groups of tension members in alternating constellation has the advantage that by comparing a tension member or a group of tension members with a larger number of tension members or groups of tension members a better statement about the condition of the individual tension member or . of the

Gruppe von Zugträgern gemacht werden kann.Group of tension members can be made.

In einer beispielhaften Ausführungsform bilden jeweils einzelne Zugträger einen elektrischen Widerstand in der Messbrücke. In einer alternativen Ausführungsform bilden jeweils mehrere oder alle Zugträger eines Tragmittels einen elektrischen Widerstand in der Messbrücke.In an exemplary embodiment, each individual tensile carriers form an electrical resistance in the measuring bridge. In an alternative embodiment, in each case several or all tensile carriers of a suspension element form an electrical resistance in the measuring bridge.

In einer beispielhaften Ausführungsform wird der elektrische Widerstand jedes Zugträgers bzw. jeder Gruppe von Zugträgern der Aufzugsanlage mit elektrischen Widerständen von zumindest drei anderen Zugträgern bzw. drei anderen Gruppen von Zugträgern verglichen. Dies hat den Vorteil, dass durch ein solches Verfahren eine ausreichend gute Aussage über den Zustand eines Zugträgers bzw. einer Gruppe von Zugträgern gemacht werden kann, und dass die Zugträger bzw. die Gruppen von Zugträgern in einer einfachen und robusten Wheatstoneschen Messbrücke verschaltet werden können. Dabei kann durch die Bestimmung eines Parameters, insbesondere die Brückenspannung, eine Aussage über den Zustand von vier Zugträgern bzw. vier Gruppen von Zugträgern gemacht werden. Somit wird hier ein sehr effizientes und zuverlässiges Verfahren zur Bestimmung eines Zustandes eines Tragmittels in einer Aufzugsanlage zur Verfügung gestellt.In an exemplary embodiment, the electrical resistance of each tension member or group of tension members of the elevator installation is compared with electrical resistances of at least three other tension members or three other groups of tension members. This has the advantage that a sufficiently good statement about the condition of a tension member or a group of tension members can be made by such a method, and that the tension members or the groups of tension members can be interconnected in a simple and robust Wheatstone bridge. In this case, by determining a parameter, in particular the bridge voltage, a statement can be made about the condition of four tension members or four groups of tension members. Thus, a very efficient and reliable method for determining a state of a suspension element in an elevator installation is provided here.

In einer beispielhaften Ausführungsform werden beim Ermitteln des Zustandes des Tragmittels keine absoluten Widerstandswerte der Zugträger bzw. der Gruppen von Zugträgern bestimmt. Ein solches Verfahren hat wiederum den Vorteil, dass dadurch nicht unnötig viele Parameter gemessen und ausgewertet werden müssen. Dies verhindert das Risiko von Messfehlern und Fehlinterpretationen von Messresultaten.In an exemplary embodiment, when determining the state of the suspension element, no absolute resistance values of the tension members or the groups of tension members are determined. Such a method in turn has the advantage that it does not require unnecessarily many parameters to be measured and evaluated. This prevents the risk of measurement errors and misinterpretations of measurement results.

Die hier offenbarte Bestimmung eines Zustandes eines Tragmittels bzw. die hier offenbarte Überwachungseinrichtung kann in unterschiedlichen Arten von Aufzugsanlagen eingesetzt werden. So können beispielsweise Aufzugsanlagen mit oder ohne Schacht, mit oder ohne Gegengewicht, oder Aufzugsanlagen mit unterschiedlichen Übersetzungsverhältnissen eingesetzt werden. Somit kann jedes riemenartige Tragmittel in einer Aufzugsanlage, welches eine Kabine trägt, mit der hier offenbarten Methode bzw. Vorrichtung überwacht werden.The determination of a condition of a suspension element disclosed here or the monitoring device disclosed here can be used in different types of elevator installations. For example, elevator systems with or without shaft, with or without counterweight, or elevator systems with different gear ratios can be used. Thus, each belt-type suspension element in an elevator installation, which carries a car, can be monitored with the method or device disclosed here.

Anhand von Figuren wird die Erfindung symbolisch und beispielhaft näher erläutert. Es zeigen:

Figur 1
eine beispielhafte Ausführungsform einer Aufzugsanlage;
Figur 2
eine beispielhafte Ausführungsform eines Tragmittels; und
Figuren 3a-3c
jeweils eine beispielhafte Ausführungsform einer Messbrücke.
The invention will be explained symbolically and by way of example with reference to figures. Show it:
FIG. 1
an exemplary embodiment of an elevator system;
FIG. 2
an exemplary embodiment of a support means; and
FIGS. 3a-3c
each an exemplary embodiment of a measuring bridge.

Die in Figur 1 schematisch und beispielhaft dargestellte Aufzugsanlage 40 beinhaltet eine Aufzugskabine 41, ein Gegengewicht 42 und ein Tragmittel 1 sowie eine Treibscheibe 43 mit zugeordnetem Antriebsmotor 44. Die Treibscheibe 43 treibt das Tragmittel 1 an und bewegt damit die Aufzugskabine 41 und das Gegengewicht 42 gegengleich. Der Antriebsmotor 44 ist von einer Aufzugssteuerung 45 gesteuert. Die Kabine 41 ist gestaltet, um Personen oder Güter aufzunehmen und zwischen Etagen eines Gebäudes zu transportieren. Kabine 41 und Gegengewicht 42 sind entlang von Führungen (nicht dargestellt) geführt. Im Beispiel sind die Kabine 41 und das Gegengewicht 42 jeweils an Tragrollen 46 aufgehängt. Das Tragmittel 1 ist dabei an einer ersten Tragmittelbefestigungsvorrichtung 47 festgemacht, und dann zunächst um die Tragrolle 46 des Gegengewichts 42 geführt. Sodann ist das Tragmittel 1 über die Treibscheibe 43 gelegt, um die Tragrolle 46 der Kabine 41 geführt, und schliesslich durch eine zweite Tragmittelbefestigungsvorrichtung 47 mit einem Fixpunkt verbunden. Dies bedeutet, dass das Tragmittel 1 mit einer entsprechend einem Umhängefaktor höheren Geschwindigkeit über den Antrieb 43, 44 läuft, als sich Kabine 41 bzw. Gegengewicht 42 bewegen. Im Beispiel beträgt der Umhängefaktor 2:1.In the FIG. 1 schematically illustrated lift system 40 includes an elevator car 41, a counterweight 42 and a support means 1 and a traction sheave 43 with associated drive motor 44. The traction sheave 43 drives the support means 1 and thus moves the elevator car 41 and the counterweight 42 gegengleich. The drive motor 44 is controlled by an elevator control 45. The cabin 41 is designed to receive people or goods and to transport between floors of a building. Cabin 41 and counterweight 42 are guided along guides (not shown). In the example, the cabin 41 and the counterweight 42 are each suspended on support rollers 46. The support means 1 is fastened to a first support means fastening device 47, and then first guided around the support roller 46 of the counterweight 42. Then the suspension element 1 is placed over the traction sheave 43, guided around the support roller 46 of the cabin 41, and finally connected by a second suspension means fastening device 47 with a fixed point. This means that the suspension element 1 runs at a higher speed via the drive 43, 44, in accordance with a transfer factor, than the car 41 or counterweight 42 move. In the example, the wrap factor is 2: 1.

Ein loses Ende 1.1 des Tragmittels 1 ist mit einer Kontaktierungsvorrichtung 2 zur temporären oder permanenten elektrischen Kontaktierung der Zugträger und somit zur Überwachung des Tragmittels 1 versehen. Im dargestellten Beispiel ist an beiden Enden 1.1 des Tragmittels 1 eine derartige Kontaktierungsvorrichtung 2 angeordnet. In einer alternativen nicht dargestellten Ausführungsform ist nur eine Kontaktierungsvorrichtung 2 an einem der Tragmittelenden 1.1 angeordnet, und die Zugträger am anderen Tragmittelende 1.1 sind elektrisch miteinander verbunden. Die Tragmittelenden 1.1 sind von der Zugkraft im Tragmittel 1 nicht mehr belastet, da diese Zugkraft bereits vorgängig über die Tragmittelbefestigungsvorrichtungen 47 in das Gebäude geleitet ist. Die Kontaktierungsvorrichtungen 2 sind also in einem nicht überrollten Bereich des Tragmittels 1 und ausserhalb des belasteten Bereichs des Tragmittels 1 angeordnet.A loose end 1.1 of the suspension element 1 is provided with a contacting device 2 for temporary or permanent electrical contacting of the tension members and thus for monitoring the suspension element 1. In the example shown, such a contacting device 2 is arranged at both ends 1.1 of the suspension element 1. In an alternative embodiment, not shown, only one contacting device 2 is arranged on one of the support means ends 1.1, and the tension members on the other support means end 1.1 are electrically connected to each other. The support means ends 1.1 are no longer burdened by the tensile force in the suspension element 1, since this tensile force already prevail is passed over the suspension means fasteners 47 in the building. The contacting devices 2 are thus arranged in a non-overrun area of the suspension element 1 and outside the loaded area of the suspension element 1.

Im Beispiel ist die Kontaktierungsvorrichtung 2 an einem Ende des Tragmittels 1.1 mit einer Überwachungsvorrichtung 3 verbunden. Die Überwachungsvorrichtung 3 verschaltet dabei die Zugträger des Tragmittels 1 als elektrische Widerstände in einer Messbrücke. Dadurch sind die elektrischen Widerstände von verschiedenen Zugträgern anhand einer von der Überwachungseinrichtung 3 ermittelten Brückenspannung miteinander vergleichbar. Die Überwachungsvorrichtung 3 ist zudem mit der Aufzugssteuerung 45 verbunden. Dadurch kann ein Signal oder ein Messwert von der Überwachungsvorrichtung 3 an die Aufzugssteuerung 45 übermittelt werden, um den Zustand des Tragmittels 1, wie ermittelt von der Überwachungsvorrichtung 3, in einer Steuerung des Aufzuges 40 zu berücksichtigen.In the example, the contacting device 2 is connected at one end of the support means 1.1 with a monitoring device 3. The monitoring device 3 interconnects the tension members of the suspension element 1 as electrical resistors in a measuring bridge. As a result, the electrical resistances of different tension members are comparable to one another on the basis of a bridge tension determined by the monitoring device 3. The monitoring device 3 is also connected to the elevator control 45. As a result, a signal or a measured value can be transmitted from the monitoring device 3 to the elevator control 45 in order to take into account the state of the suspension element 1 as determined by the monitoring device 3 in a control of the elevator 40.

Die gezeigte Aufzugsanlage 40 in Figur 1 ist beispielhaft. Andere Umhängefaktoren und Anordnungen, wie beispielsweise Aufzugsanlagen ohne Gegengewicht, sind möglich. Die Kontaktierungsvorrichtung 2 zur Kontaktierung des Tragmittels 1 wird dann entsprechend der Platzierung der Tragmittelbefestigungsvorrichtungen 47 angeordnet.The elevator installation 40 shown in FIG FIG. 1 is exemplary. Other capping factors and arrangements, such as counterbalanced lift systems, are possible. The contacting device 2 for contacting the support means 1 is then arranged according to the placement of the support means fastening devices 47.

In Figur 2 ist ein Abschnitt einer beispielhaften Ausführungsform eines Tragmittels 1 dargestellt. Das Tragmittel 1 umfasst mehrere parallel zueinander angeordnete elektrisch leitende Zugträger 5, welche von einem Mantel 6 umhüllt sind. Zur elektrischen Kontaktierung der Zugträger 5 kann der Mantel 6 beispielsweise durchstochen oder entfernt werden, oder die Zugträger 5 können auch stirnseitig von einer Kontaktierungsvorrichtung 2 elektrisch kontaktiert werden.
In diesem Beispiel ist das Tragmittel mit Längsrippen auf einer Traktionsseite ausgestattet. Solche Längsrippen verbessern ein Traktionsverhalten des Tragmittels 1 auf der Treibscheibe 43 und erleichtern zudem eine seitliche Führung des Tragmittels 1 auf der Treibscheibe 43. Das Tragmittel 1 kann jedoch auch anders ausgestaltet werden, beispielsweise ohne Längsrippen, oder mit einer anderen Anzahl oder anderen Anordnung der Zugträger 5. Wesentlich für die Erfindung ist es, dass die Zugträger 5 elektrisch leitend ausgestaltet sind.In FIG. 2 a section of an exemplary embodiment of a support means 1 is shown. The support means 1 comprises a plurality of mutually parallel electrically conductive tension members 5, which are enveloped by a jacket 6. For electrical contacting of the tension members 5, the jacket 6 can be pierced or removed, for example, or the tension members 5 can also be electrically contacted on the face side by a contacting device 2.
In this example, the suspension element is equipped with longitudinal ribs on a traction side. Such longitudinal ribs improve a traction of the support means 1 on the traction sheave 43 and also facilitate lateral guidance of the support means 1 on the traction sheave 43. However, the support means 1 can also be designed differently, for example without longitudinal ribs, or with a different number or different arrangement of the tension members 5. It is essential for the invention that the tension members 5 are designed to be electrically conductive.

In den Figuren 3a bis 3c sind Beispiele von Messbrücken 12 schematisch dargestellt. Dabei sind jeweils elektrische Widerstände 14 miteinander zu einer Messbrücke 12 verschaltet. Eine Spannungsquelle 13 stellt dabei eine Gesamtspannung über die Messbrücke 12 zur Verfügung, und eine Brückenspannung 15 kann als Parameter für eine Gleichheit bzw. Verschiedenartigkeit der elektrischen Widerstände 14 herangezogen werden. Indem Zugträger 5 eines Tragmittels 1 einzeln oder in Gruppen als elektrische Widerstände 14 in einer Messbrücke 12 eingesetzt werden, kann durch eine Bewertung der Brückenspannung 15 eine Information über den Zustand der Zugträger 5 und somit des Tragmittels 1 gewonnen werden.In the FIGS. 3a to 3c Examples of measuring bridges 12 are shown schematically. In each case electrical resistors 14 are interconnected to a measuring bridge 12. A voltage source 13 provides a total voltage across the measuring bridge 12, and a bridge voltage 15 can be used as a parameter for equality or diversity of the electrical resistors 14. By tensile carriers 5 of a suspension element 1 are used individually or in groups as electrical resistors 14 in a measuring bridge 12, information about the state of the tension members 5 and thus of the suspension element 1 can be obtained by evaluating the bridge tension 15.

In Figur 3a ist eine Wheatstonesche Messbrücke 12 gezeigt. Vier elektrische Widerstände 14 sind dabei derart miteinander verschaltet, dass die Brückenspannung 15 null beträgt, wenn alle vier elektrischen Widerstände 14 gleich gross sind.
In Figur 3b ist eine Messbrücke 12 dargestellt, in welcher jeweils zwei elektrische Widerstände 14 parallel verschaltet sind und eine Gruppe bilden. Insgesamt vier solcher Gruppen bilden die Messbrücke 12, bei welcher wiederum die Brückenspannung 15 als Mass für die Gleichheit der elektrischen Widerstände 14 herangezogen werden kann.
In Figur 3c ist eine Messbrücke 12 gezeigt, in welcher acht elektrische Widerstände 14 verschaltet sind. Hier kann an mehreren Orten eine Brückenspannung 15 bestimmt werden. Wiederum kann die Brückenspannung 15 als Mass für die Gleichheit der elektrischen Widerstände 14 herangezogen werden.In FIG. 3a a Wheatstone bridge 12 is shown. Four electrical resistors 14 are interconnected in such a way that the bridge voltage 15 is zero when all four electrical resistors 14 are the same size.
In FIG. 3b a measuring bridge 12 is shown in which two electrical resistors 14 are connected in parallel and form a group. A total of four such groups form the measuring bridge 12, in which in turn the bridge voltage 15 can be used as a measure of the equality of the electrical resistors 14.
In Figure 3c a measuring bridge 12 is shown, in which eight electrical resistors 14 are connected. Here, a bridge voltage 15 can be determined at several locations. Again, the bridge voltage 15 can be used as a measure of the equality of the electrical resistors 14.

Die hier gezeigten Messbrücken sind Beispiele für eine geeignete Messbrücke zur Ermittlung eines Zustandes eines Tragmittels. Es versteht sich von selbst, dass auch andersartige Messbrücken zur Erzielung desselben technischen Effektes verwendet werden können. Beispielsweise kann auch eine Dreiviertel- oder eine Halbmessbrücke verwendet werden. Somit kann je nach Ausgestaltung der Aufzugsanlage bzw. des Tragmittels eine geeignete Messbrücke ausgewählt werden.The measuring bridges shown here are examples of a suitable measuring bridge for determining a condition of a suspension element. It goes without saying that different types of measuring bridges can be used to achieve the same technical effect. For example, a three-quarter or one half-bridge can be used. Thus, depending on the configuration of the elevator installation or the suspension element, a suitable measuring bridge can be selected.

Claims (11)

  1. Lift installation with a cage (4) and at least one support means (1), wherein the cage (41) is supported at least partly by support means (1) and wherein the support means (1) comprises a plurality of electrically conductive tensile carriers (5) which are arranged parallel to one another and which are substantially enclosed by a casing (6), the lift installation further comprising a monitoring device (3) which connects the tensile carriers (5) or groups of tensile carriers (5) in alternating configuration as electrical resistances (14) in a measuring bridge (12) so that the electrical resistances of different tensile carriers (5) or groups of tensile carriers (5) can be compared with one another by way of a bridge voltage (15).
  2. Lift installation according to claim 1, wherein in each instance an individual tensile carrier (5) is connected as an electrical resistance (14) in the measuring bridge (12).
  3. Lift installation according to claim 1, wherein in each instance a plurality of tensile carriers (5) of a support means (1) is, as a group, connected as an electrical resistance (14) in the measuring bridge (12).
  4. Lift installation according to claim 1, wherein in each instance all tensile carriers (5) of a support means (1) are, as a group, connected as an electrical resistance (14) in the measuring bridge (12).
  5. Lift installation according to claim 3 or 4, wherein the tensile carriers (5) are respectively connected in series with one another and thus form an electrical resistance (14) in the measuring bridge (12).
  6. Lift installation according to claim 3 or 4, wherein the tensile carriers (5) are respective connected in parallel with one another and thus form an electrical resistance (14) in the measuring bridge (12).
  7. Lift installation according to any one of the preceding claims, wherein four electrical resistances (14) consisting of one or more tensile carriers (5) are connected in a Wheatstone measuring bridge (12).
  8. Method of determining a state of at least one support means (1) in a lift installation (40), the lift installation (40) comprising a cage (41) and at least one support means (1), wherein the cage (41) is at least partly supported by the support means (1) and wherein the support means (1) comprises a plurality of electrically conductive tensile carriers (5) which are arranged parallel to one another and which are substantially enclosed by a casing (6), the method comprising the steps:
    - connecting the tensile carriers (5) or groups of tensile carriers (5) in an alternating combination to form electrical resistances (14) in a measuring bridge (12); and
    - determining a state of the support means by comparison of the electrical resistances of the tensile carriers or groups of tensile carriers (5) by way of a bridge voltage (15).
  9. Method according to claim 8, wherein in each instance individual tensile carriers (5) form an electrical resistance (14) in the measuring bridge (12).
  10. Method according to claim 8, wherein in each instance a plurality of or all tensile carriers (5) of a support means (1) forms or form an electrical resistance (14) in the measuring bridge (12).
  11. Method according to any one of claims 8 to 10, wherein the electrical resistance of each tensile carrier (5) or each group of tensile carriers (5) of the lift installation (40) is compared with electrical resistances of at least three other tensile carriers (5) or three other groups of tensile carriers (5).
EP13802043.3A 2012-12-18 2013-12-06 Lift assembly with monitoring device and method for monitoring a lift assembly Active EP2935071B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13802043.3A EP2935071B1 (en) 2012-12-18 2013-12-06 Lift assembly with monitoring device and method for monitoring a lift assembly

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP12197674 2012-12-18
EP13802043.3A EP2935071B1 (en) 2012-12-18 2013-12-06 Lift assembly with monitoring device and method for monitoring a lift assembly
PCT/EP2013/075826 WO2014095430A1 (en) 2012-12-18 2013-12-06 Lift system with monitoring device and method for monitoring a lift system

Publications (2)

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EP2935071A1 EP2935071A1 (en) 2015-10-28
EP2935071B1 true EP2935071B1 (en) 2016-10-12

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US (1) US9975734B2 (en)
EP (1) EP2935071B1 (en)
CN (1) CN104854012B (en)
AU (1) AU2013361005B2 (en)
BR (1) BR112015012964B1 (en)
CA (1) CA2890138C (en)
ES (1) ES2611003T3 (en)
HK (1) HK1211008A1 (en)
MX (1) MX361117B (en)
MY (1) MY172444A (en)
SG (1) SG11201503569YA (en)
WO (1) WO2014095430A1 (en)

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EP3060510B1 (en) * 2013-10-22 2019-02-27 KONE Corporation Method and device for checking the integrity of load bearing members of an elevator system
AU2015321059B2 (en) * 2014-09-26 2018-11-15 Inventio Ag Elevator system
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BR112017009860A2 (en) * 2014-11-28 2017-12-19 Inventio Ag elevator system
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EP3642146B1 (en) 2017-06-21 2021-04-21 Inventio AG Method for self-testing a monitoring device monitoring an integrity status of a suspension member arrangement in an elevator
CA3071484A1 (en) * 2017-09-15 2019-03-21 Inventio Ag Method for electrical attachment of a connecting element to a belt for a lift system and corresponding belt assembly

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ES2426463T3 (en) * 2008-12-22 2013-10-23 Inventio Ag Procedure for the supervision of an elevator support means, a supervision installation of an elevator support means and an elevator installation with such a supervision installation
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Publication number Publication date
AU2013361005A1 (en) 2015-07-09
MX361117B (en) 2018-11-28
CN104854012A (en) 2015-08-19
BR112015012964B1 (en) 2021-11-16
CN104854012B (en) 2016-11-09
MY172444A (en) 2019-11-26
WO2014095430A1 (en) 2014-06-26
US9975734B2 (en) 2018-05-22
BR112015012964A2 (en) 2017-07-11
CA2890138A1 (en) 2014-06-26
EP2935071A1 (en) 2015-10-28
AU2013361005B2 (en) 2017-01-05
HK1211008A1 (en) 2016-05-13
CA2890138C (en) 2017-08-22
MX2015007817A (en) 2015-08-20
ES2611003T3 (en) 2017-05-04
US20150336769A1 (en) 2015-11-26
SG11201503569YA (en) 2015-07-30

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