WO2021116527A1 - Surveillance d'un système d'ascenseur - Google Patents

Surveillance d'un système d'ascenseur Download PDF

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Publication number
WO2021116527A1
WO2021116527A1 PCT/FI2019/050879 FI2019050879W WO2021116527A1 WO 2021116527 A1 WO2021116527 A1 WO 2021116527A1 FI 2019050879 W FI2019050879 W FI 2019050879W WO 2021116527 A1 WO2021116527 A1 WO 2021116527A1
Authority
WO
WIPO (PCT)
Prior art keywords
elevator
control unit
elevator rope
rope
variation
Prior art date
Application number
PCT/FI2019/050879
Other languages
English (en)
Inventor
Petteri Valjus
Henri WENLIN
Original Assignee
Kone Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kone Corporation filed Critical Kone Corporation
Priority to PCT/FI2019/050879 priority Critical patent/WO2021116527A1/fr
Publication of WO2021116527A1 publication Critical patent/WO2021116527A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/0006—Monitoring devices or performance analysers
    • B66B5/0037—Performance analysers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/0006—Monitoring devices or performance analysers
    • B66B5/0018—Devices monitoring the operating condition of the elevator system
    • B66B5/0025—Devices monitoring the operating condition of the elevator system for maintenance or repair

Definitions

  • the invention concerns in general the technical field of elevators. More particularly, the invention concerns monitoring of an elevator.
  • An elevator system is a complex solution which comprise parts and devices which wear during use. A wearing may cause variation in an operation of the elevator system and, in the worst case, reduce safety of using the elevator system.
  • So-called roped elevator systems are based on a solution in which an elevator car is raised and lowered by elevator ropes, typically made of metal.
  • the elevator ropes such as hoisting ropes or overspeed governor ropes, may be attached to the elevator car at one end and to a counter weight or to the elevator car at the other end and the elevator rope is looped at least partly around a traction sheave, or any similar entity, between the mentioned ends.
  • the traction sheave is a grooved pulley into which grooves the traction rope, or ropes, is fitted to.
  • the traction sheave is coupled to an electrical motor, and when the motor is controlled to rotate the traction sheave, and as a result the elevator car moves along its pathway e.g.
  • An object of the invention is to present a method, a control unit, an elevator system and a computer program product for monitoring of an elevator system.
  • a method for monitoring of an elevator system comprises: receiving measurement data from a sensor arranged to measure at least one elevator rope during a motion of an elevator car; detecting from the measurement data a variation on a surface of the elevator rope; determining a parameter representing the motion of the elevator car from the variation on the surface of the elevator rope; comparing the parameter to a reference value; and setting, in accordance with a comparison between the parameter and the reference value, a detection result to express one of the following: (i) the elevator system operates as expected, (ii) an operation of the elevator system deviates from expected.
  • the variation on the surface of the elevator rope may be detected based on detection of at least one measurement data value representing a peak in a projected image of the elevator rope and at least one measurement data value representing a valley in the projected image of the elevator rope.
  • the parameter may be determined on a basis of at least one of: detection of adjacent peaks from the variation on the surface of the elevator rope; detection of adjacent valleys from the variation on the surface of the elevator rope.
  • a monitoring of the elevator system may be based on a monitoring of a slip of the elevator rope.
  • the slip of the elevator rope may be determined by determining, as the parameter, a speed of the elevator rope on a basis of the variation of the elevator rope.
  • the reference value may be determined from signal representing a speed of an electrical motor rotating a traction sheave along which the elevator rope is arranged to travel at least in part.
  • a monitoring of the elevator system may be based on a monitoring of an elongation of the elevator rope.
  • the reference value may correspond to a reference distance between two predetermined points within a travel path of the elevator car. For example, a distance between the two predetermined points may be determined on a basis of the variation of the elevator rope for comparison. Moreover, the distance between the two predetermined points within a travel path of the elevator car may be defined as a number of detected adjacent peaks or detected adjacent valleys. The reference distance between the two predetermined points may e.g. correspond to a known distance between two floors within the travel path of the elevator car.
  • a control unit for monitoring of an elevator system comprising: at least one processor; at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the control unit to perform: receive measurement data from a sensor arranged to measure at least one elevator rope during a motion of an elevator car; detect from the measurement data a variation on a surface of the elevator rope; determine a parameter representing the motion of the elevator car from the variation on the surface of the elevator rope; compare the parameter to a reference value; and set, in accordance with a comparison between the parameter and the reference value, a detection result to express one of the following: (i) the elevator system operates as expected, (ii) an operation of the elevator system deviates from expected.
  • the control unit may be arranged to detect the variation on the surface of the elevator rope based on detection of at least one measurement data value representing a peak in a projected image of the elevator rope and at least one measurement data value representing a valley in the projected image of the elevator rope.
  • control unit may be arranged to determine the parameter on a basis of at least one of: detection of adjacent peaks from the variation on the surface of the elevator rope; detection of adjacent valleys from the variation on the surface of the elevator rope.
  • the control unit may also be arranged to perform a monitoring of the elevator system based on a monitoring of a slip of the elevator rope.
  • the control unit may be arranged to determine the slip of the elevator rope by determining, as the parameter, a speed of the elevator rope on a basis of the variation of the elevator rope.
  • the control unit may also be arranged to determine the reference value from a signal representing a speed of an electrical motor rotating a traction sheave along which the elevator rope is arranged to travel at least in part.
  • the control unit may be arranged to perform a monitoring of the elevator system based on a monitoring of an elongation of the elevator rope. For example, the control unit may be arranged to apply a reference distance between two predetermined points within a travel path of the elevator car as the reference value. Still further, the control unit may be arranged to determine a distance between the two predetermined points on a basis of the variation of the elevator rope for comparison.
  • the control unit may also be arranged to define the distance between the two predetermined points within a travel path of the elevator car as a number of detected adjacent peaks or detected adjacent valleys.
  • control unit may be arranged to apply a known distance between two floors within the travel path of the elevator car as the reference distance between the two predetermined points.
  • an elevator system comprising: at least one elevator rope; at least one sensor for measuring the at least one elevator rope; and a control unit according to the second aspect as described in the foregoing description.
  • a computer program product for monitoring of an elevator system which computer program product, when executed by at least one processor, cause a control unit to perform the method according to the first aspect as described in the foregoing description.
  • a number of refers herein to any positive integer starting from one, e.g. to one, two, or three.
  • a plurality of refers herein to any positive integer starting from two, e.g. to two, three, or four.
  • Figure 1 illustrates schematically an example of an elevator system according to an embodiment of the invention.
  • Figure 2 illustrates schematically a method according to an embodiment of the invention.
  • Figure 3 illustrates schematically some aspects relating to an embodiment of the invention.
  • Figure 4 illustrates schematically a control unit according to an embodiment of the invention.
  • FIG 1 illustrates schematically an example of an elevator system 100 into which the present invention may be implemented.
  • the elevator system 100 of Figure 1 comprises an elevator car 110 and a counterweight 120 connected to each other with at least one elevator rope 130.
  • the term “elevator rope” in the context of the present invention shall at least be understood to cover such as hoisting ropes or overspeed governor ropes.
  • the elevator rope 130 especially in a case of hoisting rope, is arranged to travel though a traction system, and especially at least in part over a traction sheave 140. In other words, the elevator rope 130 is looped over the traction sheave 140 which, through rotational motion, causes the elevator car 110 and the counterweight 120 to move vertically in an elevator shaft.
  • the energy for the rotational motion of the traction sheave is generated with an electrical motor 150 controllable by a control unit 160 with control signals.
  • at least one sensor 170 is arranged to monitor the at least one elevator rope 130, wherein the sensor generates measurement data representing at least one characteristic of the at least one elevator rope 130.
  • the measurement data is obtained by the control unit 160, which is arranged to analyse the measurement data in a manner as is described in a forthcoming description in order to generate a detection result of a monitoring of the elevator system.
  • an applicable sensor 170 is an inductive sensor generating a magnetic field interacting with metallic objects, such as the at least one elevator rope, and in that manner generating an output signal from which is possible to analyse aspects relating to the at least one elevator rope 130, and, hence, aspects with respect to the elevator system 100.
  • Another applicable sensor 170 type may be one based on an electromagnetic radiation. There a transmitter of the electromagnetic radiation, such as a visible light, is arranged on one side of the at least one elevator rope 130 and a detector is arranged on the other side of the at least one elevator rope 130. Hence, by transmitting electromagnetic radiation through the at least one elevator rope 130 it is possible to receive an output signal from the detector from which it is possible to derive characteristics of the elevator rope 130 for further use as will be described.
  • each of the entities may comprise a control unit 170 on their own, wherein one control unit 160 may be arranged to operate as a master unit and the other control units as slave units at least from the perspective of the present invention wherein the master unit may perform the method as is described in the forthcoming description.
  • the sensor 170 is arranged to measure the at least one elevator rope 130 at the traction sheave 140, but the measurement may be performed at some other entities, such as at diverter pulleys along which the elevator rope 130 may be arranged to travel.
  • the term “diverter pulley” shall also be understood to cover an overspeed governor pulley. As said, the measurement shall be performed at such location where the at least one elevator rope 130 under monitoring is arranged to travel during an operation of the elevator.
  • an aim is to obtain measurement data from the elevator system 100 from which it is possible to derive information on a condition of the elevator system 100, such as on a condition of a traction system, for example.
  • the present invention provides a mechanism to monitor e.g. a slip of the elevator rope 130 with respect to an entity it travels over, such as the traction sheave, as well as an elongation of the elevator rope 130 both having relevance in an evaluation of the condition of the elevator system.
  • FIG. 2 illustrates schematically a method according to an embodiment of the invention.
  • a control unit 160 may be communicatively coupled to at least one sensor 170 arranged to generate measurement data with respect to at least one elevator rope 130.
  • the at least one sensor 170 may be arranged to measure at least one elevator rope 130.
  • the measurement since the measurement is performed during an operation of the elevator system, i.e. when the elevator car 110 travels, the at least one sensor 170 generates a plurality of measurement data values representing consecutive slices of the elevator rope 130 into a direction the elevator rope 130 has traveled within a detection area of the sensor 170.
  • the measurement data values may e.g.
  • control unit 160 may receive 210 the measurement data from the at least one sensor 170 by reading the measurement data from an output of the respective sensor 170.
  • the control unit 160 may be arranged to detect a variation on a surface of the elevator rope 130 along a length the elevator rope 130 travelled.
  • the detection of the variation may be based on a representation of the elevator rope 130 generated from the received measurement data values.
  • the representation may be so-called peak-valley representation of the elevator rope 130, or at least one edge of the elevator rope 130, as schematically illustrated in Figure 3.
  • the representation may be considered as a projection of an image on the elevator rope 130.
  • the peaks and valleys may be used as a source of variation due to a structure of the elevator rope 130.
  • the structure of the elevator rope 130 is achieved by composing a plurality of strands consisting of wires together. The number of the strands may e.g.
  • measurement data values may be generated.
  • Figure 3 it is shown, as an example, positions of the rope at different instants of time t1 ...t8 in the measurement point of the sensor 170.
  • a sampling rate of the sensor 170 is adjusted with respect to the motion of the elevator rope 130 so that the measurement data value in question either corresponds to a value of a peak or a valley.
  • the sampling rate may be set much higher in order to gain more measurement data values enabling to generate a more accurate representation of the elevator rope 130 by the control unit 160.
  • the control unit 160 may be arranged to determine from an output signal of the sensor 170 (i.e. from the respective measurement data value) which position of the elevator rope 130 the measurement data value represents to. For example, in case of inductive sensor on a basis of a voltage value of the output signal it may be determined if the measurement data value represents a peak or a valley (e.g. through comparing to a reference value).
  • the control unit 160 may be arranged to detect 220 a variation of a surface of the elevator rope 130 e.g. in the manner as described in the foregoing description i.e. based on a detection of at least one measurement data value representing a peak in a projected image of the elevator rope 130 and at least one measurement data value representing a valley in the projected image of the elevator rope 130. By performing the detection to all measurement data received over the length of travel of the elevator rope 130 it is possible to detect consecutive peaks and/or consecutive valleys from the measurement data.
  • the method may be continued, in response to the detection of the variation 220, by determining 230 at least one parameter representing a motion of the elevator car 110 from the measurement data either directly or indirectly.
  • the at least one parameter to be determined may be dependent on an entity, or an aspect, under monitoring, but may e.g. be a speed the elevator rope 130 travels during the measurement or a distance the elevator car 110 travels during the measurement.
  • a comparison 240 of the determined parameter to a reference value, or values in case of a plurality of parameters is performed.
  • an aim is to determine if the elevator system, or the monitored entity, operates as expected, i.e. that the operation is proper, or if the elevator system, or the monitored entity, does not operate as expected, i.e. that the operation is improper.
  • the control unit 160 may be arranged to set a detection result to either that (i) the elevator system operates as expected, or that (ii) an operation of the elevator system deviates from expected.
  • the setting of the detection result accordingly may generate an indication in a further entity, such as in a data center arranged to monitor an operation of one or more elevator in a centralized manner.
  • a service to the elevator system may be arranged to.
  • the detection result may comprise data indicating a reason for the deviation, e.g. based on the aspect under monitoring.
  • the invention is applied to a monitoring of a slip of an elevator rope 130 in a traction sheave 140.
  • the slip refers to a situation in which a friction between the traction sheave 140 and the elevator rope 130 under monitoring is not good enough and at least part of a power provided by the traction sheave 140 does not transfer to the rope 130 due to slipping.
  • This kind of situation may e.g. refer to a worn-out of a groove of the traction sheave 140 into which the elevator rope 130 in question is positioned.
  • the slip of the elevator rope 130 may be detected by determining, from at least two sources one of which is the sensor 170, a parameter representing a motion of the elevator car 110.
  • the parameter representing the motion may be a speed.
  • the speed of the elevator rope 130, and, hence, the elevator car 110 may be determined from the measurement data received, or obtained, from the sensor 170 on a basis of the detected variation on the surface of the elevator rope 130. Namely, as the variation, i.e. the peak-valley variation, may be detected it is possible to determine the speed of the elevator rope 130 during the motion.
  • the distance may e.g. be defined as a technical character of the elevator rope 130 in question. Since the distance is known, it is possible to calculate a total length the elevator rope 130 travels as a whole, or only a portion of the motion, within a respective time frame t. The total length may e.g.
  • N N x d PP /w
  • N corresponds to the number of detected peak-to-peak or valley-to-valley distances during the monitoring period
  • d PP /w corresponds to the distance between adjacent peaks or adjacent valleys (depends on the item under detection).
  • the value representing the determined parameter is compared 240 to a reference value.
  • the reference value may be determined from another source of the elevator system.
  • the other source may be an electrical motor 150 of the elevator, and, especially, a motor encoder arranged to generate a signal, e.g. by pulses, expressing at least speed on which the electrical motor 150 rotates to.
  • a motor encoder arranged to generate a signal, e.g. by pulses, expressing at least speed on which the electrical motor 150 rotates to.
  • the speed values determined from the different sources may be compared 240 and in accordance with the comparison, it may be determined in the elevator system operates as expected 250 or not 260. In some embodiments there may be set a tolerance which defines an acceptable
  • the monitoring of the elevator system may be arranged over long period of time in order to detect changes.
  • the control unit 160 may be arranged to perform the monitoring cycle at least one in a predefined time window, and transmit information, such as the speed values from the two sources, to a data center. For example, if it is detected e.g. in the data center that the slipping continuous increase, a service request may be set to the elevator system in question.
  • the elongation of the elevator rope 130 may e.g. refer to a constructional stretch of the elevator rope 130 due to elevator rope’s structure and heavy forces the elevator rope 130 needs to tolerate during use.
  • the monitoring of the elongation of the elevator rope 130 may be based on a comparison of a distance the elevator car 110 travels to a reference value. The distance the elevator car 110 travels may be determined on a basis of a variation on a surface of the elevator rope 130 under monitoring.
  • the variation may be detected during the motion of the elevator car 110 by detecting either peaks or valleys of the elevator rope 110 from the measurement data from the at least one sensor 170.
  • detecting either peaks or valleys in the elevator rope 130 it is possible to determine a number of the peak-to-peak or valley-to-valley detections during over the motion of the elevator rope 130.
  • the distance between adjacent peaks or valleys in the elevator rope 130 may be known (e.g.
  • the distance the elevator car 110 travels corresponds of the determined total length L the elevator rope 130 travels wherein the distance is used as the parameter in the comparison 240.
  • a reference value for the comparison 240 may be determined from other sources. In accordance with the present invention, the reference value may be a known distance between one or more floors of a building the elevator system resides.
  • the distance the elevator car 110 is arranged to travel 240 for the monitoring shall correspond to the reference distance, such as the distance between topmost floor and the bottom floor, and in the comparison step the distance determined from the measurement data received from the at least one sensor 170 is compared to the reference value. If the two deviates, e.g. more than an allowed tolerance, a comparison result may be set that an operation of the elevator system is not as expected 260 which corresponds to the situation that the elevator rope 130 has elongated more than allowed. Alternatively, if the deviation is within an acceptable tolerance, the detection result may be set so that it indicates that the elevator system operates as expected 250 i.e. the elevator rope 130 meets requirements.
  • a monitoring of the elongation of the elevator rope 130 is based on a determination a distance through the detected variation 220 of the elevator rope 130.
  • the monitoring of the elongation of the elevator rope 130 may be established so that the number of peak-to-peak or valley-to-valley detections over a predetermined distance, such as between one or more floors, are determined when the elevator rope 130 is new and it can be considered as a reference.
  • the detected number of the peak-to-peak or the valley-to-valley detections over the predetermined distance is stored in a memory accessible by the control unit 160 as the reference value.
  • the term “distance” used for the evaluation shall be understood to cover any value representing the distance either directly or indirectly.
  • FIG. 4 schematically illustrates a control unit 160 according to an example embodiment of the invention.
  • the control unit 160 may comprise a processing unit 410, a memory 420 and a communication interface 430 among other entities.
  • the processing unit 410 may comprise one or more processors arranged to implement one or more tasks for implementing at least part of the method steps as described.
  • the processing unit 410 may be arranged to control an operation of at least one sensor 170, and also an operation of the elevator system and/or any entities therein, as well as any other entities relating to the present invention.
  • the memory 420 may be arranged to store computer program code as a non-transitory computer readable medium which, when executed by the processing unit 410, cause the control unit 160 to operate as described.
  • the memory 420 may be arranged to store, as described, the reference data, and any other data, such as a plurality of definitions for different kinds of degradations to be applied in the manner as described in the foregoing description.
  • the communication interface 430 may be arranged to implement, e.g. under control of the processing unit 410, one or more communication protocols enabling the communication with the entities as described.
  • the communication interface may comprise necessary hardware and software components for enabling e.g. wireless communication and/or communication in a wired manner.
  • some aspects of the present invention may relate to an elevator system arranged to implement the monitoring in accordance with the method as described.
  • the specific examples provided in the description given above should not be construed as limiting the applicability and/or the interpretation of the appended claims. Lists and groups of examples provided in the description given above are not exhaustive unless otherwise explicitly stated.

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  • Maintenance And Inspection Apparatuses For Elevators (AREA)

Abstract

La présente invention concerne un procédé de surveillance d'un système d'ascenseur (100), le procédé comprenant : la réception (210) des données de mesure provenant d'un capteur (170) agencé pour mesurer au moins un câble d'ascenseur (130) pendant un mouvement d'une cabine d'ascenseur (110) ; la détection, (220) à partir des données de mesure, d'une variation sur une surface du câble d'ascenseur (130) ; la détermination (230) d'un paramètre représentant le mouvement de la cabine d'ascenseur (110) à partir de la variation sur la surface du câble d'ascenseur (130) ; la comparaison (240) du paramètre par rapport à une valeur de référence ; et la définition d'un résultat de détection pour exprimer l'un des éléments suivants : (i) le système d'ascenseur (100) fonctionne comme prévu (250), (ii) une opération du système d'ascenseur (100) s'écarte de ce qui est attendu (260). La présente invention concerne également une unité de commande (160), un système d'ascenseur (100) et un produit programme d'ordinateur.
PCT/FI2019/050879 2019-12-10 2019-12-10 Surveillance d'un système d'ascenseur WO2021116527A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/FI2019/050879 WO2021116527A1 (fr) 2019-12-10 2019-12-10 Surveillance d'un système d'ascenseur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2019/050879 WO2021116527A1 (fr) 2019-12-10 2019-12-10 Surveillance d'un système d'ascenseur

Publications (1)

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WO2021116527A1 true WO2021116527A1 (fr) 2021-06-17

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11492231B2 (en) * 2016-05-23 2022-11-08 Mitsubishi Electric Corporation Elevator apparatus
IT202100027992A1 (it) * 2021-11-03 2023-05-03 Montanari Giulio & C Soc A Responsabilita Limitata Metodo di monitoraggio di macchine elevatrici, particolarmente ascensori e scale mobili
FR3134574A1 (fr) * 2022-04-13 2023-10-20 Serge ARNOULT Ascenseur à boucle fermée sécurisé

Citations (6)

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Publication number Priority date Publication date Assignee Title
US4887155A (en) * 1986-12-06 1989-12-12 Robert Massen Method and arrangement for measuring and/or monitoring properties of yarns or ropes
JPH10318741A (ja) * 1997-05-16 1998-12-04 Kobe Steel Ltd ワイヤーロープの伸び測定方法及び伸び測定装置
CN101456507B (zh) * 2004-05-28 2011-04-20 三菱电机株式会社 电梯的绳索打滑检测装置
EP3085653A1 (fr) * 2015-04-24 2016-10-26 Kone Corporation Élévateur
EP3336036A1 (fr) * 2016-12-16 2018-06-20 KONE Corporation Procédé et sytème de surveillance de l'état d'un câble de levage d'un appareil de levage
EP3617124A1 (fr) * 2018-08-29 2020-03-04 Otis Elevator Company Dispositif de mesure de l'allongement d'un câble d'ascenseur

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887155A (en) * 1986-12-06 1989-12-12 Robert Massen Method and arrangement for measuring and/or monitoring properties of yarns or ropes
JPH10318741A (ja) * 1997-05-16 1998-12-04 Kobe Steel Ltd ワイヤーロープの伸び測定方法及び伸び測定装置
CN101456507B (zh) * 2004-05-28 2011-04-20 三菱电机株式会社 电梯的绳索打滑检测装置
EP3085653A1 (fr) * 2015-04-24 2016-10-26 Kone Corporation Élévateur
EP3336036A1 (fr) * 2016-12-16 2018-06-20 KONE Corporation Procédé et sytème de surveillance de l'état d'un câble de levage d'un appareil de levage
EP3617124A1 (fr) * 2018-08-29 2020-03-04 Otis Elevator Company Dispositif de mesure de l'allongement d'un câble d'ascenseur

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11492231B2 (en) * 2016-05-23 2022-11-08 Mitsubishi Electric Corporation Elevator apparatus
IT202100027992A1 (it) * 2021-11-03 2023-05-03 Montanari Giulio & C Soc A Responsabilita Limitata Metodo di monitoraggio di macchine elevatrici, particolarmente ascensori e scale mobili
WO2023079461A1 (fr) * 2021-11-03 2023-05-11 Montanari Giulio & C.-Societa' A Responsabilita' Limitata Procédé de surveillance pour machines de levage, en particulier pour ascenseurs et escaliers roulants
FR3134574A1 (fr) * 2022-04-13 2023-10-20 Serge ARNOULT Ascenseur à boucle fermée sécurisé

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