EP3898478A1 - Système d'ascenseur comprenant un dispositif de mesure de distance à laser - Google Patents

Système d'ascenseur comprenant un dispositif de mesure de distance à laser

Info

Publication number
EP3898478A1
EP3898478A1 EP19809849.3A EP19809849A EP3898478A1 EP 3898478 A1 EP3898478 A1 EP 3898478A1 EP 19809849 A EP19809849 A EP 19809849A EP 3898478 A1 EP3898478 A1 EP 3898478A1
Authority
EP
European Patent Office
Prior art keywords
elevator
measuring device
laser beam
mirror
configuration
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Withdrawn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
EP19809849.3A
Other languages
German (de)
English (en)
Inventor
Domenico DE PIANO
Faruk Osmanbasic
Titus BUCHER
Michael THALMANN
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
Publication of EP3898478A1 publication Critical patent/EP3898478A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B66B1/3492—Position or motion detectors or driving means for the detector
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone

Definitions

  • the present invention relates to an elevator installation.
  • the present invention relates to an elevator installation.
  • the present invention relates to an elevator installation.
  • elevator cabs are shifted along a mostly essentially vertical travel path in order to transport passengers and / or transport goods located therein between different height positions.
  • An elevator car is moved using a drive machine.
  • the drive machine is controlled by an elevator control.
  • a current position of its elevator car should always be known with sufficient accuracy.
  • Corresponding position information can be required, for example, by the elevator control in order to be able to move the elevator car precisely to a desired height position by appropriately controlling the drive machine.
  • the elevator car should be able to be moved to a specific floor in a building and be positioned there in such a way that its floor is flush with a floor of the floor.
  • elevator systems are known in which information about the respective height positions is provided at a plurality of height positions parallel to the travel path of the elevator car in such a way that it can be detected mechanically by a reading device carried along with the elevator car.
  • a magnetic tape can run parallel to the travel path of the elevator car, ie, for example on a wall of an elevator shaft, and a code can be stored on the magnetic tape at every position, so that when the code is read, clear information about the respective height position can be derived.
  • this approach requires that the magnetic tape be laid parallel to the entire travel path of the elevator car, which is particularly the case with very high
  • Elevator systems can involve considerable effort.
  • the elevator car can be moved carefully and thus very slowly along the entire travel path in a so-called Lem mars.
  • Position information that may be important for the later operation of the elevator system, such as positions at which the
  • the elevator car should stop on one floor, or the start and end positions of the travel path must be learned. However, carrying out such lifts can take a considerable amount of time and / or work, particularly in the case of high elevator systems.
  • Elevator cabin could be measured using a laser distance measuring device.
  • DE 101 26 585 A1 describes a radiation-based, contactless position reference system for elevators and a method therefor.
  • an elevator system which has an elevator car and a laser distance measuring device.
  • the elevator car can be moved along a travel path.
  • the travel path is limited at the top by an upper limit and at the bottom by a lower limit.
  • the laser distance measuring device is configured to emit a laser beam and to determine a distance to a position at which the laser beam strikes an object.
  • the laser distance measuring device is mounted on the elevator car and
  • the laser beam can be directed upwards towards the upper limit in a first configuration and can be directed downwards towards the lower limit in a second configuration.
  • a distance up to the upper limit can thus be determined in the first configuration and a distance up to the lower limit in the second configuration.
  • Laser distance measuring devices which are sometimes also referred to as laser distance meters, are able to measure distances precisely, quickly and without contact.
  • the laser distance measuring device emits one or more laser beams and then detects light which is back-reflected or back-scattered by an object which is hit by the laser beam. The distance to the object can then be deduced from the detected light.
  • a transit time which the laser beam needs to reach the object and back again to the laser distance measuring device can enable a statement to be made about the distance between the two components.
  • a phase shift between a part of a laser beam which is directed towards the object and back again to the laser distance measuring device and a part of the same laser beam which is directed along a path of known length, for example within the laser distance measuring device can provide a statement the distance between the laser distance measurement facility and enable the object.
  • Triangulation can be used to determine distances to an object.
  • Laser distance measuring device can be positioned on the elevator car of an elevator system or at a reference position within an elevator shaft of the elevator system, in order then to be able to use the laser distance measuring device to measure a current distance between the elevator car and the reference position.
  • a laser distance measuring device mounted on a roof of the elevator car can be used to measure a current distance to a ceiling of the elevator shaft.
  • a laser distance measuring device mounted under a floor of the elevator car can be used to measure a current distance to a floor in a pit of the elevator shaft.
  • the distances can also be measured in the opposite direction, i.e. from the ceiling of the elevator shaft or the pit of the
  • Elevator shaft towards the elevator car is Elevator shaft towards the elevator car.
  • the laser distance measuring device should be mounted on the elevator car in such a position, that is to say in particular in such a position, and should be configured such that it Laser beam emitted for distance measurement can be directed both upwards to an upper limit of the travel path of the elevator car and downwards to a lower limit of this travel path.
  • the laser distance measuring device mounted on the elevator car should be mounted on the elevator car in such a position, that is to say in particular in such a position, and should be configured such that it Laser beam emitted for distance measurement can be directed both upwards to an upper limit of the travel path of the elevator car and downwards to a lower limit of this travel path.
  • the laser distance measuring device mounted on the elevator car should
  • a distance up to the upper limit is determined in the first configuration and a distance up to the lower limit in the second configuration.
  • the upper limit of the travel path can be, for example, a ceiling of an elevator shaft. Alternatively, the top
  • Limitation can be defined by components that protrude below this ceiling into the elevator shaft.
  • the lower limit of the travel path can be a floor in the area of a pit of the elevator shaft or alternatively through
  • the upper and lower limits are objects that the laser beam strikes and up to which the laser distance measuring device can measure the distance.
  • the position determination thus receives the desired redundancy. Faults that only affect one of the two distance measurements, such as local smoke development within an elevator shaft, no longer endanger the entire determination of the position of the elevator car.
  • the laser distance measuring device can have a mirror which can be displaced at least between a first mirror position and a second mirror position in order to align the laser beam in the first mirror position in the first configuration and the laser beam in the second mirror position in the second configuration.
  • a mirror can be provided in the laser distance measuring device, by means of which a laser beam generated in the laser distance measuring device can be deflected in different configurations in different directions.
  • the mirror can be shifted between at least two mirror positions. In a first mirror position, the laser beam is directed upwards towards the upper limit of the travel path of the elevator car in accordance with the above-mentioned first configuration. In a second mirror position, on the other hand, according to the second configuration, the laser beam is directed downward toward the lower limit of the travel path.
  • the mirror can be rotatable about a horizontal axis of rotation, between the first mirror position and the second
  • the mirror can be displaced in the form of a rotation of the mirror in order to deflect the laser beam in different directions.
  • the mirror can have a relatively small reflecting surface, which only needs to correspond to the surface of the laser beam to be deflected or is slightly larger than this.
  • the reflective surface can be flat.
  • Such a small and / or flat mirror can be easily and with high precision oriented in different directions and thereby deflect the laser beam.
  • such a mirror can be deflected with a galvanometer drive.
  • the laser beam generated by the laser distance measuring device can thus be deflected quickly and precisely with the rotatable mirror and thus aligned from the first to the second configuration and vice versa.
  • the mirror can have several mirror surfaces aligned in differently oriented planes, so that the mirror can then be displaced translationally, in order to shift one of these mirror surfaces into the beam path of the laser beam as required and thus to align the laser beam in the first configuration or the second configuration .
  • the laser distance measuring device can also be configured such that the laser beam can be directed in a third configuration towards a lateral boundary next to the travel path, with which a distance up to the lateral boundary can be determined in the third configuration.
  • the laser distance measuring device in addition to its ability to selectively direct the laser beam upwards or downwards, can additionally be able to direct the laser beam laterally towards the lateral boundary, which is located next to the travel path of the elevator car.
  • a third configuration can be set by the laser distance measuring device, in which the laser beam is directed sideways to this vertical direction, ie, for example, in one horizontal direction. In the third configuration, this measures a distance up to the lateral boundary.
  • the laser distance measuring device can be used to perform other tasks in the elevator installation in addition to determining the current position of the elevator car.
  • the lateral boundary is thus also an object that the laser beam strikes and up to which the laser distance measuring device can measure the distance.
  • the laser distance measuring device can be displaced into a third mirror position in order to align the laser beam in the third mirror position in the third configuration.
  • Laser distance measuring device aligns the laser beam in the first or second configuration, or possibly another mirror in which
  • the laser distance measuring device can be positioned and configured such that in a so-called third mirror position it aligns the laser beam in the third configuration, that is to say transversely to a vertical direction, in particular preferably horizontally.
  • the mirror can be positioned and configured such that it does not deflect the laser beam in the third mirror position.
  • the mirror and its spatial arrangement relative to the laser beam can be configured in such a way that the mirror can be shifted into a third mirror position in which it does not influence or at least not deflect the laser beam.
  • the mirror can be positioned and / or oriented in the third mirror position such that the laser beam does not hit its reflecting surface.
  • the mirror can be oriented in the third mirror position with its reflecting surface parallel to the laser beam.
  • the optional property of the laser distance measuring device not only to be able to determine the vertical position of the elevator car along its travel path, but also to be able to measure distances in a lateral, preferably horizontal, direction can be used for various purposes.
  • the elevator installation can have a plurality of lateral delimitation marks arranged laterally next to the travel path at different heights along the travel path.
  • objects referred to herein as delimitation marks, can be located laterally next to the travel path along which the elevator car can move, which the laser beam of the laser distance measuring device can meet in the lateral direction, so that the laser distance measuring device thus has its lateral distance with reference to its own Can measure position or indirectly with reference to the travel path of the elevator car.
  • the boundary marks can be used to mark certain locally prevailing properties in the elevator system.
  • delimitation marks can be used to mark where, i.e. at what height position a travel path of the elevator car should be limited during normal operation of the elevator system, i.e. The height positions at which the elevator car should not be moved outside of maintenance work.
  • delimitation marks can be used to mark where, i.e. in which height position, for example elevator shaft doors along the
  • the lateral boundary marks can be arranged at different horizontal lateral distances based on the travel path of the elevator car.
  • a plurality of different delimitation marks can be arranged along the travel path of the elevator car, which are located on different delimitation marks
  • Height positions can be and which are arranged at different horizontal distances from the travel path of the elevator car.
  • the elevator car For example, the
  • Boundary marks can be fixed on a shaft wall of an elevator shaft and be attached at different distances from the shaft wall.
  • the delimitation marks can therefore differ in particular with regard to their lateral spacing and thus mark different locally prevailing properties within the elevator installation.
  • the laser distance measuring device can be used not only to recognize the different delimitation marks, but also to differentiate them from one another on the basis of their different lateral distances, in order thereby to be able to draw conclusions, for example, on the different local properties they mark.
  • the elevator installation can have one or a plurality of elevator shaft doors at different height positions along the travel path.
  • a horizontal lateral distance in which one of the lateral boundary marks, which is arranged at one of the height positions, with a number of those located at this height position
  • Elevator cabin provided at different height positions. These elevator shaft doors allow access between the elevator car stopped at a height position and one adjacent to the elevator shaft door
  • Elevator shaft doors are provided, which, for example, are intended to enable access from the elevator car to different areas of a floor in a selectable manner.
  • Limiting marks are used to indicate how many elevator shaft doors are provided at a certain height position. For example, at a height position at which only a single elevator shaft door is provided, the delimitation mark there can be arranged at a different lateral distance than at a different height position at which, for example, two elevator shaft doors are provided.
  • the different lateral distances can differ from one another at least to such an extent that they can be distinguished using the laser distance measuring device. In other words, the differences in the lateral distances should be greater than a measurement inaccuracy of the laser distance measuring device.
  • the delimitation marks can thus be used to determine information about locally existing numbers of elevator shaft doors.
  • Boundary mark have an upper end and a lower end. An area between the upper end and the lower end can mark an area within which the elevator car may be subjected to level compensation during the operation of the elevator installation.
  • a delimitation mark measured in the vertical direction can have a certain length.
  • the delimitation mark can be arranged and dimensioned in such a way that its upper end and its lower end each mark the vertical boundaries of an area in which the
  • the elevator car may be moved slightly as part of a level adjustment, even though its doors are not closed. Such leveling may be necessary will and be permissible if, for example, a load in the elevator car changes suddenly, for example because several passengers get in or out, and the current position of the elevator car changes slightly, in particular due to changes in the length of the suspension means holding the elevator car. With the help of level compensation, it is to be avoided that a step is formed between a floor of the elevator car and an adjacent floor within the floor. In order to avoid this, the elevator car may exceptionally be moved slightly, despite the open regulations, despite the doors being open.
  • this area In order to minimize risks for passengers, in particular, the area within which level compensation may take place must be limited. With the approach presented here, this area can be created using delimitation marks and in particular using its dimensions and positioning
  • Boundary marks are marked so that they can be
  • Laser distance measuring device feasible measurement of the lateral distance to one of these limit marks can be detected.
  • the position information which can be determined using the laser distance measuring device in its first and / or second configuration, can be sufficiently accurate to be based on this
  • FIG. 1 shows an elevator installation according to an embodiment of the present invention.
  • the elevator installation 1 includes, among other things, an elevator car 3 and a counterweight 5, which are accommodated within an elevator shaft 7.
  • the elevator car 3 and the counterweight 5 are suspended and connected to one another within the elevator shaft 7 via belt-like suspension means 9.
  • the suspension means 9 can be moved by a drive machine 11.
  • the drive machine 11 is controlled by an elevator control 15.
  • the elevator car 3 can be displaced vertically along a travel path 13 within the elevator shaft 7.
  • Travel path 13 is bounded at the top by a ceiling of the elevator shaft 7, which acts as the upper boundary 17, and at the bottom by a floor, which acts as the lower boundary 19.
  • a laser distance measuring device 21 is mounted on the elevator car 3.
  • the laser distance measuring device 21 is arranged on a roof 23 of the elevator car 3.
  • the laser distance measuring device 21 has a laser 25 which emits a laser beam 27.
  • the laser distance measuring device 21 is set up to detect portions of the emitted laser beam 27 that strike an object and are reflected or scattered back by the object, and to determine a distance from this to the position of the object.
  • the laser distance measuring device 21 is not set up such that its laser 25 emits the laser beam 27 directly to the upper or lower boundary 17, 19 and thus measures a distance up to one of these boundaries 17, 19.
  • the laser distance measuring device 21 is designed so that the one generated in it Laser beam 27 can be directed upwards towards the upper limit 17 on the one hand in a first configuration and downwards towards the lower limit 19 on the other hand in a second configuration. Accordingly, both a distance up to the upper limit 17 and up to the lower limit 19 can be measured with the aid of the laser distance measuring device 21.
  • a current position of the laser distance measuring device 21 and thus of the elevator car 3 connected to it within the elevator shaft 7 can thus be determined in two ways, ie redundantly.
  • the laser distance measuring device 21 has, for example, a mirror 29, by means of which the laser beam 27 initially emitted horizontally by the laser 25 can be deflected vertically upwards or vertically downwards.
  • the mirror 29 can be rotated about an axis of rotation 31, so that, as can be clearly seen in the enlarged partial view in FIG. 1, it can be rotated into a first mirror position 33 ′′ and into a second mirror position 33 ′′.
  • first mirror position 33 ′′ and into a second mirror position 33 ′′.
  • Mirror position 33 ' is the mirror 29 so inclined, i.e. in the example shown at a 45 ° angle to the original direction of propagation of the laser beam 27, i.e. In the example shown, arranged to the horizontal, that the laser beam 27 is then directed upwards toward the upper boundary 17 as a laser beam 27 '.
  • the mirror 29 (as shown in dashed lines) is inclined in the opposite way, that is to say in one in the example shown
  • the laser distance measuring device 21 or its mirror 29 is configured and positioned in such a way that the laser beam 27 ′′ in the second configuration passes the side next to the elevator car 3, i.e. can pass through a gap between the elevator car 3 and a side wall 39 of the elevator shaft 7, in order then to be able to reach the lower limit 19.
  • the laser distance measuring device 21 can be configured in a third configuration such that the laser beam 27 is directed as a laser beam 27 ′′ toward a lateral boundary 37 next to the travel path 13.
  • the mirror 29 can be rotated to a third position 33 '' (as in the enlarged one) 1 shown in broken lines). In this third position 33, the mirror 29 does not deflect the laser beam 27, so that it acts as a laser beam 27 in the
  • a lateral distance i.e. a distance in the horizontal direction, toward the side wall 39 or toward boundary marks 35 arranged on the side wall 39 are measured.
  • the boundary marks 35 thus form the lateral boundaries 37 and can be used here to provide additional information, which may be important for the operation of the elevator installation 1, within the elevator shaft 7.
  • different delimitation marks 35 can be provided at different height positions along the travel path 13 in order to locate them there
  • the delimitation marks 35 can be arranged, for example, in different horizontal lateral distances with respect to the travel path 13 of the elevator car 3.
  • a surface of one of the boundary marks 35 directed towards the travel path 13 can be arranged at a different distance from the side wall 39 and thus also from the travel path 13 than a surface of another boundary mark 35 oriented in the same or a similar manner. Because of the laser distance measuring device 21 As a result, the various lateral distances can be measured, information can be codified that can be read out by the laser distance measuring device 21.
  • Limit marks 35 are arranged one above the other. A space or slot can remain between adjacent boundary marks 35. With the laser distance measuring device 21, the individual boundary marks 35 and the free spaces remaining between them can be recognized on the basis of the different lateral distances, and the number of boundary marks 35 can thus be determined. so that information can also be coded in this way, which can be read out by the laser distance measuring device 21.
  • the boundary marks 35 can be implemented, for example, with the aid of metal sheets which are mounted on the side wall 39 of the elevator shaft 7. These sheets can then be mounted at different distances from the side wall 39 depending on the information to be codified.
  • the sheets can have different numbers of preferably horizontal slits or a plurality of sheets can be arranged one above the other, in order to, for example, in turn codify information for the laser distance measuring device 21 by the number of slots or free spaces.
  • Sheet metal used in implementation also have a contoured surface, along which the lateral distance between the travel path 13 and the contoured surface varies. By varying the type of contoured surfaces, information for the laser distance measuring device 21 can thus again be codified in a readable manner.
  • one or a plurality of elevator shaft doors 41 can be provided in the elevator installation 1 at different height positions.
  • Limiting marks 35 can then be used to codify the number of elevator shaft doors 41 that are present locally.
  • the delimitation marks 35 can also have an upper end 43 and a lower end 45.
  • An area between the upper end 43 and the lower end 45 can mark an area within which the elevator car is controlled by the elevator controller 15 during operation of the elevator system
  • the laser distance measuring device 21 can recognize the upper end 43 and the lower end 45, for example, on the basis of a changing lateral distance there.
  • the laser distance measuring device 21 can continuously or in short the distances measured by it, in particular the lateral distances measured by it Transfer time intervals to the elevator control 15.
  • wired or wireless data communication 47 can be established between the two components.
  • the distances measured by the laser distance measuring device 21 can be used both during normal operation of the elevator installation 1 and during a learning phase.
  • the vertical distances measured in the first and / or second configuration can be used to determine the current position of the
  • Elevator cabin 3 can be closed within the elevator shaft 7.
  • Elevator cabin 3 can be closed within the elevator shaft 7.
  • Limit marks 35 codified information can be read out. Relevant information can be forwarded to the elevator control 15 and evaluated there in order to control the elevator installation 1 accordingly.
  • Elevator car 3 together with its laser distance measuring device 21 are preferably moved along the entire travel path 13 through the elevator shaft 7 and the information codified, for example, by the delimitation marks 35 is recorded.
  • Travel path 13 was not known in advance, but only had to be read during the lem journey, for example by detecting markings provided at corresponding height positions within the elevator shaft. In the case of conventional elevator systems, it was therefore usually necessary to take the lem ride with greatly reduced speed, for example at a speed of only 0.3 m / s or less, which is particularly the case at very high speeds
  • Elevator systems caused a considerable amount of time to carry out the Lemfahrt.
  • lem journeys can be carried out at a significantly higher speed, for example at the nominal speed that is usual during the operation of the elevator system, whereby the time required to carry out the learning journeys can be considerably reduced. Also are
  • the cost is independent of the height of the elevator shaft.

Abstract

L'invention concerne un système d'ascenseur (1), lequel comporte une cabine (3) d'ascenseur ainsi qu'un dispositif de mesure de distance à laser (21). La cabine (3) d'ascenseur peut être déplacée le long d'une voie de déplacement (13), laquelle est délimitée vers le haut par une délimitation supérieure (17) et vers le bas par une délimitation inférieure (19). Le dispositif de mesure de distance à laser (21) est configuré pour émettre un rayon laser (27) et pour déterminer une distance par rapport à une position, à laquelle le rayon laser (27) atteint un objet. Le dispositif de mesure de distance à laser (21) est monté de telle manière sur la cabine (3) d'ascenseur et est configuré de telle manière que le rayon laser (27) peut être dirigé vers le haut en direction de la délimitation supérieure (17) dans une première configuration et peut être dirigé vers le bas en direction de la délimitation inférieure (19) dans une deuxième configuration. Une position instantanée de la cabine (3) d'ascenseur peut ainsi être déterminée de manière redondante. En outre, des espacements latéraux par rapport à des repères de délimitation (35) peuvent être mesurés dans une troisième configuration pour permettre de lire des informations, qui sont codifiées par les repères de délimitation (35).
EP19809849.3A 2018-12-18 2019-12-02 Système d'ascenseur comprenant un dispositif de mesure de distance à laser Withdrawn EP3898478A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18213312 2018-12-18
PCT/EP2019/083265 WO2020126429A1 (fr) 2018-12-18 2019-12-02 Système d'ascenseur comprenant un dispositif de mesure de distance à laser

Publications (1)

Publication Number Publication Date
EP3898478A1 true EP3898478A1 (fr) 2021-10-27

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Country Status (4)

Country Link
US (1) US20220002113A1 (fr)
EP (1) EP3898478A1 (fr)
CN (1) CN113165829A (fr)
WO (1) WO2020126429A1 (fr)

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DE102022106990A1 (de) 2022-03-24 2023-09-28 Tk Elevator Innovation And Operations Gmbh Aufzugvorrichtung, Aufzugsystem und Verfahren zum Befördern von Lasten

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CN107539855B (zh) * 2017-08-07 2019-09-06 日立楼宇技术（广州）有限公司 电梯平层故障的检测方法和系统
CN108408516A (zh) * 2018-03-08 2018-08-17 宁夏电通物联网科技股份有限公司 基于激光测距技术的电梯楼层检测装置及电梯系统及方法

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