EP3088346A1 - Sicherheitsvorrichtung und verfahren zur verhütung von unfällen im kammplattenbereich von fahrtreppen oder fahrsteigen - Google Patents

Sicherheitsvorrichtung und verfahren zur verhütung von unfällen im kammplattenbereich von fahrtreppen oder fahrsteigen Download PDF

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Publication number
EP3088346A1
EP3088346A1 EP15382207.7A EP15382207A EP3088346A1 EP 3088346 A1 EP3088346 A1 EP 3088346A1 EP 15382207 A EP15382207 A EP 15382207A EP 3088346 A1 EP3088346 A1 EP 3088346A1
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EP
European Patent Office
Prior art keywords
combplate
capacitor
capacitance
safety device
escalator
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Withdrawn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
EP15382207.7A
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English (en)
French (fr)
Inventor
Francisco Canteli
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.)
TK Escalator Norte SA
Original Assignee
ThyssenKrupp Elevator Innovation Center SA
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 ThyssenKrupp Elevator Innovation Center SA filed Critical ThyssenKrupp Elevator Innovation Center SA
Priority to EP15382207.7A priority Critical patent/EP3088346A1/de
Priority to CN201680024140.XA priority patent/CN107592853B/zh
Priority to PCT/EP2016/055935 priority patent/WO2016173770A1/en
Publication of EP3088346A1 publication Critical patent/EP3088346A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B29/00—Safety devices of escalators or moving walkways
    • B66B29/02—Safety devices of escalators or moving walkways responsive to, or preventing, jamming by foreign objects
    • B66B29/06—Combplates

Definitions

  • the present invention is comprised within the field of escalators and moving walkways, and more particularly in the field of safety devices for preventing accidents in the combplate area.
  • the combplate is a piece at the entrance and exit in an escalator or moving walkway which separates the movable part (pallets or steps) from the fixed part, the floor plate.
  • the edge of the combplate has a series of teeth which mesh with grooves in escalator steps or in moving walkway plates. Due to this, an entrapment risk is always present, especially for fingers and toes.
  • Several accidents in the combplate area are reported every year, where fingers or toes are trapped in the limit between the movable and non-movable parts of the escalator or moving walkway. Other common accidents are caused by fallen people on the floor plate who are unintentionally blocking the exit of the escalator/moving walk, increasing the risk while the escalator/moving walk keep running until somebody stops manually the system.
  • Some security devices can monitor the movement of the comb segment and/or the combplate and trigger an alarm signal.
  • safety devices installed in the escalators or moving walkways detect a displacement of the combplate, the escalator or moving walkway is immediately stopped.
  • Document DE29907184-A1 discloses an escalator and a moving walkway wherein the comb segments have a wire attached to the comb teeth. When there is a comb tooth fracture, it can be detected since the wire is interrupted. Document WO14208906-A1 also detects comb teeth fracture by using a detection line.
  • Document GB1031967-A discloses a safety comb for escalators with comb teeth which are longitudinally movable against respective springs to close a switch in the circuit of the drive motor of the escalator.
  • an obstruction in the treads of a step of the escalator will engage one or more comb teeth and stop the escalator.
  • DE10259149-A1 discloses use of capacitance sensors for monitoring the integrity of the comb teeth on an escalator combplate. To that end, pairs of conductive foil electrodes are located on the comb teeth and nearby on the combplate, and connected to an electronic monitoring unit which indicates the breaking of a single comb tooth when detects a change in capacitance. When this safety device detects the effective breaking of a single comb tooth, it causes a shutdown of the escalator or the moving walkway.
  • Document WO14015870-A2 discloses a security device mounted at the junction of the comb teeth with the combplate, extending transversely with respect to the operating direction of the escalator or moving walkway, such that movements of the combplate and/or the comb teeth can be detected. When relative movements that exceed a predetermined amount are detected, a shutdown of the escalator or moving walk is automatically initiated.
  • Document JP8073170-A discloses a safety device for preventing an accident of an object being caught in the space between a step and a comb plate of an escalator.
  • a plate is rotatably fitted to the combplate.
  • the plate is lifted and a cam is released from a safety switch, interlocked with the motion of the plate, thereby stopping the escalator.
  • US5611417-A also discloses an apparatus for stopping escalators and moving walkways which responds to movement of the combplate due to an applied force to actuate a safety switch.
  • Document KR20040016094-A discloses a combplate safety device for a moving walkway comprising a sensor plate causing deformation due to the displacement of the comb, a deformation-sensing member attached to the sensor plate to sense deformation of the sensor plate, and a switch for stopping the operation of the moving walkway if the sensed deformation is larger than a predetermined value.
  • Some safety devices use optical means to detect obstruction or breakage in the combplate area.
  • document US4800998-A discloses a safety device for use in the comb part of an escalator landing, operable to detect objects which pass into the comb from the escalator treads.
  • the device includes a photodetector positioned beneath the comb and which detects a light beam projected across the comb where the treads pass through the comb. When a foreign object passes under the comb and blocks the light beam, this potential hazard is sensed by the detector. If the light beam remains blocked for a predetermined time period, operation of the escalator motor is stopped.
  • Other documents such as JP11292451-A and CN203922417U , also make use photosensors to detect when a comb tooth is broken or there is an obstruction in the combplate area.
  • Other safety devices such as the one disclosed in US2008252724-A , includes optically monitoring of a combplate by taking a picture of the combplate with a camera, comparing the picture with a reference picture, and then determining the safety state of the combplate based on such comparison.
  • the present invention solves this problem, preventing accidents before they occur, that is, before the combplate is displaced or obstructed by a user's finger or toe.
  • This new type of safety device is based on capacitive technology, and it takes into account the different capacitance which can be measured on a metallic surface depending on the contact, or presence near the metal, of human skin or a human body.
  • the system is able to detect when a human body or human skin is near or in contact to a dangerous area (such as comb teeth) ignoring at the same time the contact with other parts like shoes, umbrellas, rollers, etc.
  • the combplate or floor plate itself works as a component of the capacitive sensor.
  • the invention is used not only for avoiding entrapment of fingers, but for detecting a fallen person in the combplate/floor plate area.
  • the capacitance measured in the comb area can be managed by a controller who can adjust the defined level to sense, filter the signal and decide when there is a real dangerous situation even before the finger contacts the detection area.
  • the detection can be done in the combs edge or in an embedded band near combs and displacement of the combplate is not needed to activate the safety function, thus avoiding human body injuries.
  • fallen people can be detected due to the capacity variation caused by the presence of the human body over the floor plate.
  • the body surface in contact with the metal plate is higher than in the combs solution, a person lying on the floor plate can be detected even when there is no skin contact with the floor plate (i.e. there is only contact with the person's clothes).
  • a safety device for preventing accidents in the combplate/floor plate area of escalators or moving walkways.
  • the safety device comprises:
  • the safety device comprises only one capacitor, wherein the first capacitor plate may be formed:
  • the safety device comprises a plurality of capacitors, as many as combplate segments, wherein the first capacitor plate of each capacitor is formed by a different combplate segment.
  • the at least one predefined value is established so as to detect the approach/contact of human or animal skin to the combplate area or to detect a fallen body on the floor plate.
  • This predefine value or values may be static (do not change) or dynamic (they dynamically change and adapt to the particular situation).
  • the controller is preferably configured to stop itself the escalator or moving walkway when a dangerous situation is detected.
  • a method for preventing accidents in the combplate area of escalators or moving walkways comprises:
  • the method preferably also comprises a conditioning and filtering step of the capacitance signal, for instance to filter anomalous data such as sudden peaks in the capacitance signal.
  • the method further comprises checking if the acceptable predefined values have changed and in that case defining new predefined values.
  • the method may comprise measuring the capacitance of a plurality of capacitors, as many as combplate segments, wherein the first capacitor plate of each capacitor is formed by a different combplate segment.
  • the invention relates to a new detection system to detect contact or proximity of a human or animal body in the combplate or floor plate area.
  • the system is able to distinguish the human or animal body/skin from other objects.
  • This system is based on capacitive technology which allows, measuring the capacitance in the combplate or floor plate area, to distinguish different materials.
  • the combplate or the floor plate as one of the capacitor plates (positive or negative) and ground or any other part of the escalator/moving walkway as the other capacitor plate there will be a capacitor where the dielectric is composed by the air and the materials between the combplate/floor plate and the other capacitor plate.
  • the capacitance C measured corresponds to the different situations illustrated in the lower section of Figure 1 .
  • the capacitance signal 20 substantially increases (see central section 11 of the graph), and in a normal situation, when no human or animal skin is close to the combs area (see left 10 and right 12 sections of the graph), capacitance C remains substantially steady.
  • FIGs 2A and 2B shows in more detail the approach of a finger 5 of a user's hand 3 to the teeth 4 of the combplate 2.
  • Capacitance is an electrical property that exists between two conductive surfaces within a reasonable proximity. A change in the distance between both conductive surfaces or their electrical charge (+q, -q) implies a capacitance variation.
  • the capacitance measured is C1.
  • the capacitance measured is C1, wherein Cl ⁇ C2.
  • FIG. 3 depicts a basic electrical diagram of the safety device installed on an escalator 1 (depicted in a side view and a top view).
  • the safety device comprises a controller 6 (for instance, a microcontroller or a PLC), a capacitance measuring module 7 and a capacitor 8, which is formed by a first capacitor plate (the combplate 2) and a second capacitor plate 9 connected to ground 13.
  • a controller 6 for instance, a microcontroller or a PLC
  • a capacitance measuring module 7 and a capacitor 8 which is formed by a first capacitor plate (the combplate 2) and a second capacitor plate 9 connected to ground 13.
  • the capacitance measuring module 7 measures the capacitance C of the capacitor 8.
  • the controller 6 receives the capacitance information measured by the capacitance measuring module 7 and decides, based on said information, whether it is a normal situation or a dangerous situation. In the latter case, the controller 6 can stop the escalator 1 or emit a warning signal.
  • the system is able to detect variations in the environment and decide if a person has touched the combplate or not after analyzing the received information.
  • the controller 6 and the capacitance measuring module 7 can be implemented in the same or in different equipment.
  • a combplate 2 is normally formed by several combplate segments 14, as illustrated in Figure 4A (although Figure 4A only shows two combplate segments, the combplate is normally formed more than two).
  • the capacitance can be measured in several different ways:
  • FIG. 5 shows a flow diagram of the process performed by the safety device according to a preferred embodiment.
  • step 100 capacitance measurement is started.
  • step 102 the capacitance measuring module 7 receives a signal from the capacitor 8 in the combplate area.
  • the signal received is analyzed after a conditioning and filtering step 104 in order to measure the capacitance value.
  • This step 104 may be performed in the capacitance measuring module 7 or in the controller 6.
  • the controller 6 of the safety device compares 106 the measured signal with a predefined value or values (for instance, a higher and a lower threshold), which can be dynamic or static.
  • step 108 the result of the comparison is determined acceptable or not, depending on the variation of the measured signal with respect to the threshold/s.
  • Figure 6 shows the measured capacitance signal 20 and only one static threshold 22.
  • the safety device considers that a dangerous situation has occurred (a person or animal is touching the sensed area), and sends a warning signal or a stop order signal to the escalator controller, as shown in step 110.
  • the controller 6 of the safety device can also be part of the escalator controller and in that case it can immediately stop the escalator or moving walk 1.
  • the determined threshold can be dynamically obtained.
  • the safety device can check if the acceptable limits have changed and in that case define 114 new limits/thresholds for establishing the comparison. For instance, if the measured capacitance value exceeds the limit value during 1 second, a detection can be assumed. But since the capacitance is also depending on the environment condition (humidity, escalator model, steps/pallets speed, etc.), a new limit value may be fixed depending on different factors, such as the last N previous values or the mean value during the last X minutes, or another similar factor. This would be similar to an autotunning of the safety device.
  • Figure 7 shows another way, based on measuring the amplitude and frequency of a periodic capacitance signal 20. Depending on the value of the capacitance C and due to the resonance phenomenon, the amplitude of the periodic capacitance signal 20 will change in a different frequency range depending on the action performed (one finger 5, one complete hand 3, etc.).
  • the upper graph of Figure 7 shows a periodic capacitance signal with no changes in amplitude.
  • a finger 5 mouse graph
  • hand 3 lower graph
  • the safety device is used to detect contact of human skin in the combplate area for avoiding entrapment of fingers.
  • one of the capacitor plates is formed, at least partially, by the combplate.
  • the safety device is used to detect a fallen person on the floor plate.
  • one of the capacitor plates is formed by the floor plate.
  • the body surface in contact with the metal plate is much higher than in the first embodiment, in this second embodiment a fallen person on the floor plate can be detected due to the capacity variation caused by the presence of the human body over the floor plate, even when there is no skin contact with the floor plate (i.e. there is only contact with the person's clothes).
  • Upper image of Figure 8A shows a top view of an escalator/moving walkway where the floor plate is free.
  • Lower image of Figure 8A shows a risk situation with a fallen person 15 on the floor plate 16.
  • Figures 8B and 8C depicts two different methods for monitoring the capacitance signal and determining if a risk situation has occurred.
  • the capacitance signal is compared with an upper threshold.
  • the upper graph corresponds to the capacitance measured for the upper situation in Figure 8A (the floor plate is free), a normal situation where the capacitance signal 20 is lower than the threshold 22.
  • the lower graph of Figure 8A corresponds to the capacitance measured for the lower situation of Figure 8A (a fallen person on the floor plate). In this case the capacitance signal 20 exceeds the threshold 22, and a risk situation is therefore detected.
  • the amplitude and frequency of a periodic capacitance signal 20 is monitored.
  • the upper graph of Figure 8C corresponds to the upper situation of Figure 8A (normal situation), showing a periodic capacitance signal with no changes in amplitude.
  • the lower graph of Figure 8C corresponds to the lower situation of Figure 8A ( fallen person on the floor plate), showing some changes in amplitude that can be detected by the safety device.
  • the detection principle of this second embodiment is the same as in the first embodiment (human skin -e.g. a finger/hand- getting close or in contact with the combplate), checking in this second embodiment the influence in the capacitance when a human body 15 is in contact with the metal plate of the floor plate 16.
  • the complete body with clothes produces a significant variation in the capacitance, similar to the variation of capacitance in the comb area when a finger/hand is close to the combplate.
  • the thresholds in both embodiments will however be different.

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  • Escalators And Moving Walkways (AREA)
  • Geophysics And Detection Of Objects (AREA)
EP15382207.7A 2015-04-27 2015-04-27 Sicherheitsvorrichtung und verfahren zur verhütung von unfällen im kammplattenbereich von fahrtreppen oder fahrsteigen Withdrawn EP3088346A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP15382207.7A EP3088346A1 (de) 2015-04-27 2015-04-27 Sicherheitsvorrichtung und verfahren zur verhütung von unfällen im kammplattenbereich von fahrtreppen oder fahrsteigen
CN201680024140.XA CN107592853B (zh) 2015-04-27 2016-03-18 用于防止在自动扶梯或自动人行道的梳齿板区域中发生事故的安全装置和方法
PCT/EP2016/055935 WO2016173770A1 (en) 2015-04-27 2016-03-18 Savety device and method for preventing accidents in the combplate area of escalators or moving walkways

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15382207.7A EP3088346A1 (de) 2015-04-27 2015-04-27 Sicherheitsvorrichtung und verfahren zur verhütung von unfällen im kammplattenbereich von fahrtreppen oder fahrsteigen

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EP3088346A1 true EP3088346A1 (de) 2016-11-02

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EP15382207.7A Withdrawn EP3088346A1 (de) 2015-04-27 2015-04-27 Sicherheitsvorrichtung und verfahren zur verhütung von unfällen im kammplattenbereich von fahrtreppen oder fahrsteigen

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EP (1) EP3088346A1 (de)
CN (1) CN107592853B (de)
WO (1) WO2016173770A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108919360A (zh) * 2018-07-12 2018-11-30 山东科技大学 一种基于电容检测的输送管道人体探测装置
US10351392B1 (en) 2018-10-23 2019-07-16 Otis Elevator Company Escalator and moving walkway system with safety sensor
CN110077946A (zh) * 2019-05-30 2019-08-02 迅达（中国）电梯有限公司 扶梯安全装置和扶梯
CN112265900A (zh) * 2020-11-09 2021-01-26 皖江工学院 自动扶梯安全保护系统及其工作方法
CN116917222B (zh) * 2021-02-16 2024-03-01 三菱电机楼宇解决方案株式会社 检查乘客输送机的多个梳齿与多个防滑条之间的位置关系的状态的检查装置
WO2023187884A1 (ja) * 2022-03-28 2023-10-05 三菱電機株式会社 櫛板の破損検出装置

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GB1031967A (en) 1963-11-06 1966-06-02 Schweiz Wagons Aufzuegefab Improvements in or relating to escalators
US4800998A (en) 1988-01-21 1989-01-31 Otis Elevator Company Escalator comb safety device
JPH0873170A (ja) 1994-09-01 1996-03-19 Mitsubishi Denki Bill Techno Service Kk エスカレータの安全装置
US5611417A (en) 1995-04-24 1997-03-18 Inventio Ag Apparatus for stopping a passenger conveyor
US5718319A (en) 1996-02-14 1998-02-17 Gih; Gir Escalator and moving walk comb safety device
DE29907184U1 (de) 1999-04-22 1999-08-26 Thyssen Fahrtreppen Gmbh Fahrtreppe oder Fahrsteig
JPH11292451A (ja) 1998-04-09 1999-10-26 Mitsubishi Electric Building Techno Service Co Ltd エスカレータ乗降口安全装置
US6520310B1 (en) * 2001-12-27 2003-02-18 Inventio Ag Combplate load and obstruction sensor apparatus
KR20040016094A (ko) 2002-08-16 2004-02-21 오티스 엘리베이터 컴파니 이동보도의 콤플레이트 안전장치
US20040134748A1 (en) 2002-12-24 2004-07-15 Toshiba Elevator Kabushiki Kaisha Safety device for a passenger conveyor
DE10259149A1 (de) 2002-12-18 2004-07-15 Kone Corp. Einrichtung zur Überwachung von Bauteilbrüchen im Bereich einer Rolltreppe oder eines Rollsteiges
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US20080252724A1 (en) 2005-09-16 2008-10-16 Herbert Horbruegger Optically Monitoring Comb-Line of Escalators and Moving Walks
CN101323412A (zh) 2008-07-30 2008-12-17 苏州江南嘉捷电梯股份有限公司 自动扶梯
CN202296792U (zh) 2011-09-28 2012-07-04 快意电梯有限公司 一种扶梯前沿板安全装置
DE102011112528A1 (de) 2011-09-07 2013-03-07 Henning Testing Systems Gmbh Verfahren zur Sicherheitsüberprüfung einer Fahrtreppe und Einrichtung zur Ausführung des Verfahrens
WO2014015870A2 (de) 2012-07-24 2014-01-30 Thyssenkrupp Fahrtreppen Gmbh Fahrtreppe oder fahrsteig
CN203922417U (zh) 2014-05-27 2014-11-05 苏州德奥电梯有限公司 一种扶梯梳齿板防夹结构
WO2014208906A1 (ko) 2013-06-26 2014-12-31 (주)미주하이텍 에스컬레이터의 안전 콤플레이트

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1031967A (en) 1963-11-06 1966-06-02 Schweiz Wagons Aufzuegefab Improvements in or relating to escalators
US4800998A (en) 1988-01-21 1989-01-31 Otis Elevator Company Escalator comb safety device
JPH0873170A (ja) 1994-09-01 1996-03-19 Mitsubishi Denki Bill Techno Service Kk エスカレータの安全装置
US5611417A (en) 1995-04-24 1997-03-18 Inventio Ag Apparatus for stopping a passenger conveyor
US5718319A (en) 1996-02-14 1998-02-17 Gih; Gir Escalator and moving walk comb safety device
JPH11292451A (ja) 1998-04-09 1999-10-26 Mitsubishi Electric Building Techno Service Co Ltd エスカレータ乗降口安全装置
DE29907184U1 (de) 1999-04-22 1999-08-26 Thyssen Fahrtreppen Gmbh Fahrtreppe oder Fahrsteig
US6520310B1 (en) * 2001-12-27 2003-02-18 Inventio Ag Combplate load and obstruction sensor apparatus
KR20040016094A (ko) 2002-08-16 2004-02-21 오티스 엘리베이터 컴파니 이동보도의 콤플레이트 안전장치
DE10259149A1 (de) 2002-12-18 2004-07-15 Kone Corp. Einrichtung zur Überwachung von Bauteilbrüchen im Bereich einer Rolltreppe oder eines Rollsteiges
US20040134748A1 (en) 2002-12-24 2004-07-15 Toshiba Elevator Kabushiki Kaisha Safety device for a passenger conveyor
US20070137979A1 (en) 2005-08-12 2007-06-21 Motor Drives & Controls, Inc. Method for detecting faults in a combplate and sensor combplate
US20080252724A1 (en) 2005-09-16 2008-10-16 Herbert Horbruegger Optically Monitoring Comb-Line of Escalators and Moving Walks
CN101323412A (zh) 2008-07-30 2008-12-17 苏州江南嘉捷电梯股份有限公司 自动扶梯
DE102011112528A1 (de) 2011-09-07 2013-03-07 Henning Testing Systems Gmbh Verfahren zur Sicherheitsüberprüfung einer Fahrtreppe und Einrichtung zur Ausführung des Verfahrens
CN202296792U (zh) 2011-09-28 2012-07-04 快意电梯有限公司 一种扶梯前沿板安全装置
WO2014015870A2 (de) 2012-07-24 2014-01-30 Thyssenkrupp Fahrtreppen Gmbh Fahrtreppe oder fahrsteig
WO2014208906A1 (ko) 2013-06-26 2014-12-31 (주)미주하이텍 에스컬레이터의 안전 콤플레이트
CN203922417U (zh) 2014-05-27 2014-11-05 苏州德奥电梯有限公司 一种扶梯梳齿板防夹结构

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CN107592853A (zh) 2018-01-16
WO2016173770A1 (en) 2016-11-03
CN107592853B (zh) 2022-02-01

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