WO2012030332A1 - Resistance-based monitoring system and method - Google Patents
Resistance-based monitoring system and method Download PDFInfo
- Publication number
- WO2012030332A1 WO2012030332A1 PCT/US2010/047445 US2010047445W WO2012030332A1 WO 2012030332 A1 WO2012030332 A1 WO 2012030332A1 US 2010047445 W US2010047445 W US 2010047445W WO 2012030332 A1 WO2012030332 A1 WO 2012030332A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- support structure
- resistors
- resistance
- monitoring system
- circuit
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/20—Investigating the presence of flaws
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/12—Checking, lubricating, or cleaning means for ropes, cables or guides
- B66B7/1207—Checking means
- B66B7/1215—Checking means specially adapted for ropes or cables
- B66B7/1223—Checking means specially adapted for ropes or cables by analysing electric variables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
-
- 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
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/12—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions in case of rope or cable slack
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/14—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable
- D07B1/145—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable comprising elements for indicating or detecting the rope or cable status
Definitions
- Tensile support structures such as coated steel belts or wire ropes containing metal cords, are used to move an elevator car up and down within an elevator shaft or hoistway. Because the condition of the tensile support structure is critical to the safety of the operation of the elevator, there is a need to determine the remaining strength level of the tensile support and detect if the remaining strength level falls below a minimum threshold.
- the strength of a tensile support structure can be reduced by normal operation of the elevator over time.
- the primary source of the degradation in the strength of the support structure is the cyclic bending of the support structure around sheaves as the elevator is moved up and down in an elevator shaft or hoistway.
- the degradation of a support structure is normally not uniform along the length of the support structure, but rather, focused to areas of the support structure that are subjected to high levels or severities of bending cycles.
- Some electrical characteristics, such as electrical resistance or impedance, of the cables, cords or tension members in the support structure will vary as the cross-sectional areas of the tension members decrease. Accordingly, it is possible to determine the remaining support strength of the support structure based on the electrical characteristics of the tension members thereof.
- monitoring systems which employ a resistance-based inspection scheme to monitor the resistance of support structures, and thus, the remaining strength thereof.
- Such systems are built upon microprocessor based designs, which utilize several analog to digital and/or digital to analog interfaces, and other added implementations for processing digital signals. The digital nature of such systems further rely on sampled data, and thus, are unable to provide continuous monitoring or immediate responses to detected fault conditions.
- FIG. 1 is a partial perspective view of an elevator system
- FIG. 3 is a schematic view of an exemplary monitoring system
- FIG. 4 is a schematic view of one exemplary set of adjustable resistors
- the elevator system 10 may include a car 12 coupled to a counterweight 14 by a support structure 16.
- the support structure 16 may extend over a traction sheave 18 that is driven by a machine 20. Traction between the sheave 18 and the support structure 16 may drive the car 12 and counterweight 14 through the hoistway. Operation of the machine 20 may be controlled by a main controller 22.
- the elevator system 10 may further include a monitoring system 24 in electrical communication with, and/or disposed in a location proximate to, the support structure 16 and configured to detect the condition of the support structure 16 by measuring, for example continuously or intermittently, the resistance thereof.
- the overall operational condition or state of a support structure 16 could be monitored continuously or intermittently for any substantial increase in resistance.
- the support structure 16 may also be monitored for any wear in the jacket coating 28 by, for example, detecting for any contact or electrical short between exposed tension members 26 and electrically conductive idler or traction sheaves 18.
- the individual tension members 26 may be connected in series so as to minimize the number of monitored resistances and provide one effective resistance per support structure 16.
- the effective resistance of a support structure 16 may be indicative of the actual resistance, or any multiple, fraction or scale thereof, exhibited by the support structure 16.
- the tension members 26 may be coupled or shorted together at alternating and respective ends using connectors 30 so as to electrically connect the tension members 26 associated with one support structure 16 in series form.
- Other arrangements, such as monitoring one or more tension members 26 in parallel or a combination of parallel and serial monitoring of subsets of the tension members 26, are also possible.
- resistors 40a-e may be disposed in parallel to the support structure 16 while resistors 40f-g may be disposed in series to resistors 40a-e and the support structure 16. Resistors 40a-e may be configured with relatively high resistances so as to minimize its effect on the current flowing through the support structure 16. Resistors 40f-g may be disposed substantially parallel to resistor 40h, and further, configured to match the resistance thereof. Accordingly, the second set of resistors 42 may be configured to substantially match the effective resistance of the support structure 16, for example, during an initial calibration of the monitoring system 24, so as to provide the baseline or reference voltage to which the output voltages at output nodes 44a-f may be compared. In alternative embodiments, the resistor circuit 32 may provide a reference voltage at output node 44g using a pulse-width modulation (PWM) device, or any other suitable means for providing a reference voltage that can be set during calibration.
- PWM pulse-width modulation
- the second set of resistors 42 may include a greater or lesser number of switch-enabled resistors 42 to vary the resolution of detection.
- the second set of resistors 42 may employ one or more potentiometers or any other combination of resistors with adjustable resistances.
- the resistance circuit 32 may be configured such that any change in the effective resistance of the support structure 16, and thus any wear thereof, will result in a change in the detected voltage across or current through any of the resistors 40a-h, 42.
- one or more of the switch-enabled resistors 42 may be temporarily or permanently sealed upon calibration so as to prohibit any further change in the resistance thereafter.
- the second set of resistors 42 may employ one or more temperature -dependent resistors 43, such as resistive thermal devices (RTDs), or the like, having a resistance that varies with temperature so as to substantially match any change in the effective resistance of the support structure 16 caused by changes in temperature. Additionally or optionally, a temperature-dependent resistor 43 may be provided in series to the second set of resistors 42, as shown for example in FIG. 3.
- RTDs resistive thermal devices
- the interface circuit 34 may be coupled to one or more output nodes 44a-g of the resistance circuit 32 and employ an analog approach to continuously monitor the effective resistance of the support structure 16. More specifically, using a series of comparators 46 and light emitting diodes (LEDs) 48, the interface circuit 34 may be configured to visually provide an operator or inspector with the corresponding operational state of the support structure 16 based on any detected change in the effective resistance thereof. A change in the effective resistance of the support structure 16 may be determined, for example, by comparing the magnitudes of one or more output voltage signals of the resistance circuit 32.
- LEDs light emitting diodes
- one or more comparators 48 may compare the respective output voltage signals at the output nodes 44a-f of the resistance circuit 32 with a reference voltage signal at the output node 44g of, for example, the calibrated second set of resistors 42. As the support structure 16 wears, the effective resistance thereof may increase, and thus, in the resistor circuit 32 of FIG. 3, cause the voltages at output nodes 44a-d to decrease. Accordingly, the degree of wear of the support structure 16 may be determined by measuring the degree by which the voltages at output nodes 44a-c have decreased. As shown in FIG.
- the support structure 16 may be in a low- wear state. If the voltage at output node 44a, which is at a higher potential relative to the output node 44c, reaches a minimum threshold and falls below the voltage at output node 44g, the support structure 16 may be at a more critical open-circuit or high-wear state.
- the interface circuit 34 may also be preconfigured with thresholds to monitor for one or more of a normal state, a calibrated state, a shorted state, an end-of-life state, and the like.
- the interface circuit 34 may be configured to control a state of one or more relays of, for example an elevator safety chain, based on and/or in response to the output signals provided by the comparators 46. In such a way, the interface circuit 34 may communicate the operational state to, for example a controller 22, of the elevator system 10.
- the method for monitoring a support structure in FIG. 6 may also include a step of comparing one or more voltages across the first set of resistors 40 with a voltage across the second set of resistors 42. This is so as to determine the degree by which the effective resistance of the support structure 16 has diverged from the resistance initially matched by the second set of resistors 42 during calibration.
- each of the output voltage signals at output nodes 44a-f may be compared with the reference voltage signal at output node 44g. If any of the voltages at output nodes 44a-f rises above or falls below the reference voltage signal according to the respective thresholds as provided in FIG.
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- Chemical & Material Sciences (AREA)
- Immunology (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Electrochemistry (AREA)
- Pathology (AREA)
- Maintenance And Inspection Apparatuses For Elevators (AREA)
- Indicating And Signalling Devices For Elevators (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Keying Circuit Devices (AREA)
- Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
Description
Claims
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2010/047445 WO2012030332A1 (en) | 2010-09-01 | 2010-09-01 | Resistance-based monitoring system and method |
CN201080068855.8A CN103068711B (en) | 2010-09-01 | 2010-09-01 | Resistance-based monitoring system and method |
RU2013103210/11A RU2534602C9 (en) | 2010-09-01 | 2010-09-01 | Monitoring system for operational resistance monitoring and method |
KR1020137008134A KR101447535B1 (en) | 2010-09-01 | 2010-09-01 | Resistance-based monitoring system and method |
US13/820,387 US9423369B2 (en) | 2010-09-01 | 2010-09-01 | Resistance-based monitoring system and method |
EP10856803.1A EP2611720B1 (en) | 2010-09-01 | 2010-09-01 | Resistance-based monitoring system and method |
BR112013002462A BR112013002462A2 (en) | 2010-09-01 | 2010-09-01 | monitoring system for a support structure, and methods for calibrating a monitoring system and for monitoring a support structure. |
JP2013527047A JP5925781B2 (en) | 2010-09-01 | 2010-09-01 | Resistance-based monitoring system and method |
US13/782,788 US9599582B2 (en) | 2010-09-01 | 2013-03-01 | Simplified resistance based belt inspection |
HK13111766.4A HK1184427A1 (en) | 2010-09-01 | 2013-10-18 | Resistance-based monitoring system and method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2010/047445 WO2012030332A1 (en) | 2010-09-01 | 2010-09-01 | Resistance-based monitoring system and method |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/782,788 Continuation-In-Part US9599582B2 (en) | 2010-09-01 | 2013-03-01 | Simplified resistance based belt inspection |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012030332A1 true WO2012030332A1 (en) | 2012-03-08 |
Family
ID=45773171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2010/047445 WO2012030332A1 (en) | 2010-09-01 | 2010-09-01 | Resistance-based monitoring system and method |
Country Status (9)
Country | Link |
---|---|
US (1) | US9423369B2 (en) |
EP (1) | EP2611720B1 (en) |
JP (1) | JP5925781B2 (en) |
KR (1) | KR101447535B1 (en) |
CN (1) | CN103068711B (en) |
BR (1) | BR112013002462A2 (en) |
HK (1) | HK1184427A1 (en) |
RU (1) | RU2534602C9 (en) |
WO (1) | WO2012030332A1 (en) |
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EP2749520A2 (en) * | 2012-12-30 | 2014-07-02 | Kone Corporation | A rope terminal assembly and an elevator |
CN103910267A (en) * | 2012-12-30 | 2014-07-09 | 通力股份公司 | Method and an arrangement in rope condition monitoring of an elevator |
EP2808285A1 (en) * | 2013-05-28 | 2014-12-03 | Inventio AG | Lift assembly |
WO2014191374A1 (en) * | 2013-05-28 | 2014-12-04 | Inventio Ag | Elevator system |
WO2014191372A1 (en) * | 2013-05-28 | 2014-12-04 | Inventio Ag | Elevator system |
US20150362450A1 (en) * | 2014-06-17 | 2015-12-17 | Kone Corporation | Method and an arrangement in condition monitoring of an elevator rope |
CN108226647A (en) * | 2018-04-13 | 2018-06-29 | 南方电网科学研究院有限责任公司 | Device for measuring impedance of power line access point |
US11305966B2 (en) | 2016-05-17 | 2022-04-19 | Inventio Ag | Method and device for detecting damage in a support for an elevator system |
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US9599582B2 (en) | 2010-09-01 | 2017-03-21 | Otis Elevator Company | Simplified resistance based belt inspection |
IN2014DN10732A (en) * | 2012-07-03 | 2015-09-04 | Otis Elevator Co | |
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US9932203B2 (en) | 2015-07-31 | 2018-04-03 | Inventio Ag | Method and device for detecting a deterioration state of a load bearing capacity in a suspension member arrangement for an elevator |
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2010
- 2010-09-01 BR BR112013002462A patent/BR112013002462A2/en not_active IP Right Cessation
- 2010-09-01 CN CN201080068855.8A patent/CN103068711B/en active Active
- 2010-09-01 EP EP10856803.1A patent/EP2611720B1/en active Active
- 2010-09-01 JP JP2013527047A patent/JP5925781B2/en not_active Expired - Fee Related
- 2010-09-01 US US13/820,387 patent/US9423369B2/en active Active
- 2010-09-01 RU RU2013103210/11A patent/RU2534602C9/en not_active IP Right Cessation
- 2010-09-01 KR KR1020137008134A patent/KR101447535B1/en active IP Right Grant
- 2010-09-01 WO PCT/US2010/047445 patent/WO2012030332A1/en active Application Filing
-
2013
- 2013-10-18 HK HK13111766.4A patent/HK1184427A1/en not_active IP Right Cessation
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Title |
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Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104854012A (en) * | 2012-12-18 | 2015-08-19 | 因温特奥股份公司 | Lift system with monitoring device and method for monitoring lift system |
US9975734B2 (en) | 2012-12-18 | 2018-05-22 | Inventio Ag | Monitoring device and method for monitoring an elevator support |
AU2013361005B2 (en) * | 2012-12-18 | 2017-01-05 | Inventio Ag | Lift system with monitoring device and method for monitoring a lift system |
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Also Published As
Publication number | Publication date |
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RU2534602C1 (en) | 2014-11-27 |
JP5925781B2 (en) | 2016-05-25 |
KR101447535B1 (en) | 2014-10-06 |
RU2013103210A (en) | 2014-10-10 |
EP2611720B1 (en) | 2022-01-12 |
CN103068711B (en) | 2015-06-17 |
EP2611720A1 (en) | 2013-07-10 |
CN103068711A (en) | 2013-04-24 |
US9423369B2 (en) | 2016-08-23 |
BR112013002462A2 (en) | 2016-05-24 |
HK1184427A1 (en) | 2014-01-24 |
JP2013541479A (en) | 2013-11-14 |
EP2611720A4 (en) | 2017-03-15 |
US20130162266A1 (en) | 2013-06-27 |
RU2534602C9 (en) | 2015-04-27 |
KR20130054397A (en) | 2013-05-24 |
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