EP3210924A1 - Ensemble de connexion d'ascenseur avec jauge de contrainte - Google Patents

Ensemble de connexion d'ascenseur avec jauge de contrainte Download PDF

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Publication number
EP3210924A1
EP3210924A1 EP16156941.3A EP16156941A EP3210924A1 EP 3210924 A1 EP3210924 A1 EP 3210924A1 EP 16156941 A EP16156941 A EP 16156941A EP 3210924 A1 EP3210924 A1 EP 3210924A1
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EP
European Patent Office
Prior art keywords
rod
cabin
connection assembly
tensions
elevator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16156941.3A
Other languages
German (de)
English (en)
Inventor
Roberto TAHARA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inventio AG
Original Assignee
Inventio AG
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 Inventio AG filed Critical Inventio AG
Priority to EP16156941.3A priority Critical patent/EP3210924A1/fr
Publication of EP3210924A1 publication Critical patent/EP3210924A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B66B7/10—Arrangements of ropes or cables for equalising rope or cable tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
    • B66B1/3476—Load weighing or car passenger counting devices
    • B66B1/3484—Load weighing or car passenger counting devices using load cells

Definitions

  • the present invention relates to a connection assembly for connecting an end of a traction medium of an elevator to an elevator shaft, a method and a controller for evaluating measurement signals from a strain gauge of a connection assembly, as well as to an elevator system.
  • the tension of traction media of an elevator (such as cables or belts) has to be adjusted to specific values and has to be regularly monitored.
  • a service technician may compare the compression of two springs, which are used for cushioning the tension of two traction media.
  • this method may be not accurate and depends on the feeling of the service technician, who is doing the commissioning.
  • connection assembly for connecting an end of a traction medium of an elevator to an elevator shaft.
  • the connection assembly may be adapted for being connected to a sidewall of the elevator shaft, for example in the region of the uppermost floor.
  • the connection assembly may be screwed to the wall.
  • the traction medium may be a flexible elongated medium adapted for transferring a force from an elevator drive along its longitudinal extension.
  • the traction medium may comprise a cable and/or a belt.
  • the traction media may be connected with one end to a first connection assembly, may run over pulleys and/or rolls, which are connected to an elevator cabin, a counter weight and/or an elevator drive and may be connected with a second end to a second connection assembly.
  • connection assembly comprises a support member attachable to the elevator shaft; a rod attached to the support member; a mount at an end of the rod for mounting the end of the traction medium to the connection assembly; and a strain gauge attached to the rod and adapted for measuring a change of length of the rod caused by a tension of the traction medium.
  • the rod may extend in a vertical direction in the elevator shaft. It may be used for supporting a spring, which is adapted for exerting tension onto a traction medium attached to the rod.
  • the rod furthermore may be a threaded rod, for example to thread the mount to the rod and/or to attach the rod to the support member.
  • the mount may be any member adapted for attaching an end of the traction medium to the rod.
  • the mount may be a bracket and/or may comprise an eye, in which the end of the traction media may be mounted.
  • one or more strain gauges may be mounted that are adapted for measuring a change of length of the rod (or at least of part of the rod) due to a tension force, which is exerted on the rod by the traction medium.
  • four strain gauges interconnected as a full-bridge circuit, based on Wheatstone bridge, may be used.
  • the rod may be seen as a (very stiff) spring, which is stretched and/or compressed due to a tension (a force) exerted by the traction medium.
  • strain gauges attached to one rod and/or to different rods, which may be used for supporting the same or different traction mediums.
  • the measurement signals of the one or more strain gauges may be evaluated in a controller of the elevator. As described above, the measurement signals may be based on changes in an electrical conductivity.
  • the measurement signals may be used for determining a tension (force) on one and/or all traction media, for example for determining the load in the elevator cabin and/or for comparing tensions in different traction media.
  • a tension force
  • Such information may be used for adjusting and/or equalizing of tensions of traction media.
  • such information may be provided to a load measurement system and/or a slack detector.
  • connection assembly and/or the corresponding controller may be used in many types of elevator systems, such as systems with and without machine room, with cabin top sling or cabin under sling, etc.
  • the structure of the remaining parts of the elevator system needs not be adapted to the connection assembly.
  • the controller may have information of loads and/or tensions of many or even all components of the elevator under suspension.
  • the rod has an outer threading and the strain gauge is attached to the outer threading.
  • the outer threading may be used for attaching the mount to the rod and/or the rod to the support member.
  • the strain gauge (for example its foil) may be glued or otherwise attached to an outer surface of the rod providing the threading.
  • the foil may extend in a direction substantially parallel to the extension of the rod (its middle axis).
  • the foil may be attached (such as glued) to an outer surface of the rod or to a further member, which is stretched and/or compressed by the rod and/or which is attached to at least two points on an outer surface of the rod.
  • connection assembly comprises at least two rods attached to the support member.
  • the rods may be used for supporting the ends of at least two traction media.
  • a strain gauge may be attached to each rod, such that a change of length of each rod is measurable independently. In such a way, information on different tensions and/or loads in the traction media may be gathered.
  • the method comprises: receiving measurement signals from at least one strain gauge; and determining at least one tension of at least one traction medium based on the measurement signals.
  • the measurement signals may be based on a changing electrical resistance in the strain gauge caused by a changing length of an electrical conductor. From such measurement signals, i.e. a force onto the rod and therefrom a tension in the traction media attached to the rod may be derived.
  • the method further comprises: receiving measurement signals from at least two strain gauges, which are attached to at least two rods, wherein the at least two rods carry the ends of at least two traction media; and determining at least two tensions in the at least two traction media.
  • the tensions in more than one traction media may be derived.
  • the elevator cabin may be lifted by two traction media and the tension in both traction media may be determined independently from each other.
  • a slack traction medium may be a traction medium which tension is substantially smaller (such as more than 20% smaller or more than 50% smaller) as the one of other traction media.
  • the slack traction medium may be damaged, since it may not run around its pulleys in a regular way anymore and may touch parts of the pulleys not intended for guiding the traction medium.
  • a slack traction medium is detected, a corresponding warning message may be generated.
  • the method further comprises: determining a load inside a cabin of the elevator based on the at least one determined tension. From the force(s) exerted by the one or more traction media to the rods, an overall load onto the rods and therefrom a load inside the elevator cabin (for example by subtracting the empty weight of the cabin) may be determined.
  • the method further comprises: providing the at least one tension to a service technician via a human machine interface, such that the service technician is able to equalize the tensions manually by adjusting the connection assembly.
  • the determined tensions and/or forces may be displayed to a technician (for example as normalized values), which may then adjust manually the tensions to desired values.
  • the technician may equalize the tension of different traction media. This may lower maintenance costs and/or may increase the quality of maintenance and quality of the final system.
  • the method further comprises: adjusting the tension in one or more connection assemblies based on the at least one determined tensions by actuating a motor, which moves the rod with respect to the support member.
  • the connection assembly comprises means for automatically adjusting the tension in a traction media.
  • a motor may be actuated by the controller, which then adjusts the tension by moving the rod with respect to the support member.
  • the method further comprises: determining at least two tensions for at least two traction media; blocking a movement of a cabin, when a difference between the at least two tensions becomes bigger than a threshold value.
  • the measurement signals also may be used for safety reasons. When the tensions in two traction media deviate strongly from each other, it may be that one of the traction media is damaged and the operation of the elevator may be stopped.
  • the method further comprises: determining a possible elevator defect by comparing cabin position dependent tensions at different cabin positions with each other. For example, when the tension in one traction medium is different at a specific position of the elevator cabin, this may indicate that the traction medium may be damaged at a specific position (which is then in contact with a roll and generates a higher or lower friction). Furthermore, misaligned rolls also may result in a specific position dependent tension of a traction media.
  • the method further comprises: determining a possible elevator defect by comparing cabin position dependent tensions at different cabin positions with reference tensions for these cabin positions. For example, before the normal operation of the elevator, position dependent tensions (tension values) may be recorded.
  • the reference values may be used during the normal operation of the elevator to detect changes in the behaviour of the elevator. For example, when the tension of one end of a traction media differs substantially (for example differs more than a predefined value) from the reference value, this may indicate that a roll has become defect (and causes a higher friction).
  • a further aspect of the invention relates to an elevator system, which comprises a traction medium adapted for moving an elevator cabin in an elevator shaft, at least one connection assembly as described in the above and in the following and/or a controller as described in the above and in the following.
  • a traction medium adapted for moving an elevator cabin in an elevator shaft
  • connection assembly as described in the above and in the following
  • controller as described in the above and in the following.
  • many usually used sensors may be become needless, since many information about the elevator system may be determined with the aid of one or more strain gauges.
  • connection assembly and/or the elevator system may be features of the method and/or controller and vice versa.
  • Fig. 1 shows an elevator system 10, which is adapted for moving an elevator cabin 12 vertically in an elevator shaft 14.
  • Two traction media 16 (such as cables or belts) are attached with first ends 18a to a sidewall 20 of the shaft 14, run down the shaft 14 to the elevator cabin 12, are guided around one or more pulleys (rolls) 22 attached to the cabin 12 and run up to a pulley 24, which is driven by an electrical motor 26.
  • the traction media 16 run down to a pulley 28 of a counter weight 30 and run up to be connected with their second ends 18b to a further sidewall 20.
  • the elevator system 10 comprises two connection assemblies 34 for supporting the ends 18a, 18b of the traction media 16 and connecting them to the respective sidewall 20.
  • Each connection assembly 34 comprises a support member 36, which may be screwed to the respective sidewall 20 and, for each end 18a, 18b of a traction member 16, a rod 38, which is vertically aligned in the shaft 14 and attached to the support member 36.
  • a mount 40 is attached to the lower end of each rod 38, which is adapted for mounting an end 18a, 18b of a traction member 16.
  • connection assembly 34 comprises two rods 38 and two mounts 40, which are attached to the same support member 36.
  • connection assembly may comprise a motor 44, which may be used for automatically adjusting a tension of a traction medium 16, for example by moving a rod 38 in the support member 36.
  • a strain gauge 46 may be provided, which is adapted for measuring a change in length of the respective rod 38 to which it is attached.
  • Measurement signals of the one or more strain gauges 46 may be sent to a controller 48 of the elevator system 10, which may evaluate the measurement signals and may control one or more motors 44 for adjusting a tension in a traction medium 16 and/or the motor 26 for moving the cabin 12.
  • Fig. 2 shows a schematic cross-section of a part of a connection assembly 34.
  • the rod 38 may have a threading 50, which, for example, may be used for attaching the mount 40 to the rod 38 and/or the rod 38 to the support member 36.
  • the strain gauge may be protected with a sleeve 54.
  • Fig. 3 shows a flow diagram for a method that may be performed by the controller 48.
  • the measurement signals may indicate a change in length of the respective rod 38 and this change of length may be transformed into a force applied to the rod 38, i.e. a tension.
  • the controller 48 needs not be one device situated at the site of the elevator, but may comprise different parts, which are communicatively interconnected.
  • it may comprise devices for transforming the output of the strain gauge 46 into a measurement signal, which may be situated directly at the strain gauge 46.
  • It furthermore may comprise parts remote from the elevator system 10, which may be connected via internet with the parts at the site of the elevator system 10.
  • the tensions may be determined dependent on the cabin position.
  • the tension values may be supplemented with information, where the cabin 12 was positioned, when the respective tension value has been determined.
  • step S12 the controller 48 determines a load inside the cabin 12 of the elevator system 10 based on the determined tension(s). For example, this load may be used for controlling the movement of the cabin 12. A higher load may result in a higher power that is provided by the motor 46.
  • the controller 48 may learn tension values for "empty cabin” and "reference load” on different levels and/positions of the shaft 14 (such as in the bottommost, middle and topmost floors).
  • the controller 48 may acquire the tensions on different points of the shaft 14 by moving the cabin to these points.
  • the service technician may put loads inside the cabin and may start a further software for acquiring the tensions for a reference load.
  • the software then may acquire the (usually different) tensions on different points of the shaft 14.
  • step S16 the controller 48 adjusts the tensions in one or more connection assemblies 34 based on the determined tensions by actuating one or more of the adjustment motors 44.
  • step S18 the controller 48 compares actual tension values of two different traction media 16 and blocks a movement of the cabin 12, when a difference between the tension values becomes bigger than a threshold value. For example, when one of the traction media becomes damaged, the tensions in the traction media 16 may become significantly different, what may be detected by the controller 48. In this case, the controller 48 may stop and/or block an operation of the elevator system 10 due to safety reasons.
  • the elevator system 10 may be blocked until an inspection by a service technician.
  • step S20 the controller 48 determines possible elevator defects by comparing actual tension values either with each other or with previously acquired reference values.
  • a warning message with a detected possible defect may be transmitted to an external service provider, for example via Internet.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
EP16156941.3A 2016-02-23 2016-02-23 Ensemble de connexion d'ascenseur avec jauge de contrainte Withdrawn EP3210924A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16156941.3A EP3210924A1 (fr) 2016-02-23 2016-02-23 Ensemble de connexion d'ascenseur avec jauge de contrainte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16156941.3A EP3210924A1 (fr) 2016-02-23 2016-02-23 Ensemble de connexion d'ascenseur avec jauge de contrainte

Publications (1)

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EP3210924A1 true EP3210924A1 (fr) 2017-08-30

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EP16156941.3A Withdrawn EP3210924A1 (fr) 2016-02-23 2016-02-23 Ensemble de connexion d'ascenseur avec jauge de contrainte

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3418234A1 (fr) * 2017-06-20 2018-12-26 Otis Elevator Company Ensemble de terminaison d'ascenseur qui fournit une indication de charge de cabine d'ascenseur
EP3578494A1 (fr) * 2018-06-06 2019-12-11 Inventio AG Installation d'ascenseur et procédé de surveillance de l'état de la courroie

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6123176A (en) 1996-05-28 2000-09-26 Otis Elevator Company Rope tension monitoring assembly and method
WO2003074406A1 (fr) 2002-02-28 2003-09-12 Otis Elevator Company Dispositif de mesure de la charge d'un ascenseur
KR100923174B1 (ko) * 2002-07-27 2009-10-22 오티스 엘리베이터 컴파니 하중 측정장치를 구비한 엘리베이터
JP2014210656A (ja) * 2013-04-19 2014-11-13 株式会社日立ビルシステム 昇降機
JP2015086027A (ja) * 2013-10-29 2015-05-07 株式会社日立ビルシステム エレベータ監視システム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6123176A (en) 1996-05-28 2000-09-26 Otis Elevator Company Rope tension monitoring assembly and method
WO2003074406A1 (fr) 2002-02-28 2003-09-12 Otis Elevator Company Dispositif de mesure de la charge d'un ascenseur
KR100923174B1 (ko) * 2002-07-27 2009-10-22 오티스 엘리베이터 컴파니 하중 측정장치를 구비한 엘리베이터
JP2014210656A (ja) * 2013-04-19 2014-11-13 株式会社日立ビルシステム 昇降機
JP2015086027A (ja) * 2013-10-29 2015-05-07 株式会社日立ビルシステム エレベータ監視システム

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3418234A1 (fr) * 2017-06-20 2018-12-26 Otis Elevator Company Ensemble de terminaison d'ascenseur qui fournit une indication de charge de cabine d'ascenseur
JP2019006605A (ja) * 2017-06-20 2019-01-17 オーチス エレベータ カンパニーＯｔｉｓ Ｅｌｅｖａｔｏｒ Ｃｏｍｐａｎｙ エレベーターかごの荷重の指標を提供するエレベーター末端装置
US10618772B2 (en) 2017-06-20 2020-04-14 Otis Elevator Company Elevator termination assembly that provides an indication of elevator car load
EP3578494A1 (fr) * 2018-06-06 2019-12-11 Inventio AG Installation d'ascenseur et procédé de surveillance de l'état de la courroie

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