WO2013062428A1 - System for continuous detection of cord defects in flat steel-plastic elevator ropes - Google Patents
System for continuous detection of cord defects in flat steel-plastic elevator ropes Download PDFInfo
- Publication number
- WO2013062428A1 WO2013062428A1 PCT/PL2012/000110 PL2012000110W WO2013062428A1 WO 2013062428 A1 WO2013062428 A1 WO 2013062428A1 PL 2012000110 W PL2012000110 W PL 2012000110W WO 2013062428 A1 WO2013062428 A1 WO 2013062428A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rope
- flat steel
- analyser
- measuring head
- detector
- 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
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
-
- 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
- B66B7/123—Checking means specially adapted for ropes or cables by analysing magnetic variables
-
- 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
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9013—Arrangements for scanning
- G01N27/9026—Arrangements for scanning by moving the material
Definitions
- the present invention relates to a diagnostic system for continuous detection of cord defects in flat steel-plastic ropes to be used particularly for the purpose of operating inspection of passenger elevators and goods lifts as well as conveyor belts reinforced with steel cords and circular cross-section cables used in cableway transport systems.
- the solution revealed in the European patent application EP2299251 uses the magnetic energy for diagnosing degradation of cords in flat steel- plastic ropes.
- the measuring head has permanent magnets that generate continuously, as the belt- shaped rope moves, a constant magnetic field with its circuit being closed through steel cords along the rope section between longitudinally deployed N-S poles.
- the measurement of variations in the magnetic field intensity taken by the detector directly over the N-S region provides a picture of homogeneity and continuity of the rope's internal ferromagnetic structure through which the magnetic field lines are being closed.
- the head comprises a number of measuring systems assigned to each of the cords such that signals from detectors of those individual systems are electronically processed, successively, in a signal processing block and an analyser, and then registered in a data carrier.
- the results allows to determine technical condition of the rope with possibility to identify, by means of an encoder, the location in which the tension strength of the rope is deteriorated.
- Similar measuring system is employed in solution presented in description of Polish patent application PL207764 designed for on-line monitoring and location of defects in a reinforced belt lapping joints of a long conveyor composed of a large number of sections connected to each other with their ends by means of vulcanisation or adhesive bonding. Solutions with heads generating permanent magnetic field and the circuit being closed along the rope are difficult to integrate in conditions where a belt-shaped rope's width is in the range 30-60 mm with small distance typically maintained between them.
- the system for continuos detection of cord defects in flat steel-plastic elevator ropes is provided, just like as in the solution described above, with an integrated measuring head comprising a magnetic filed source and a field intensity sensor, a signal processing block, a signal analyser, and a data storage.
- the measuring head comprises a variable magnetic field pulse inductor and a stray field detector situated over the surface and deployed along the cords along direction of motion of the rope one by one at a small distance from each other.
- the measuring head encompasses preferably the whole width of the rope, giving thus, in the above-described operating conditions, a result representing the local tension strength for the whole rope length.
- wireless transmission of data between the signal processing block and the analyser, and possibly also between the analyser and the data carrier may turn out to be a preferable solution.
- a defect is represented by a variation of intensity of stray field induced around the cords in the zone directly adjacent to the location where pulsed magnetic field variations occur.
- the assumed small distance between the stray field detector and the inductor is a guarantee for high damage detectability.
- analysis of the detector's signal converted into information on field pulsation resulting from periodic structure of strands allows to determine the rope velocity thus eliminating the need of using an encoder.
- the invention is illustrated below by an example embodiment of the system for continuos detection of cord defects in flat steel-polyurethane rope presented schematically in the figure.
- the system comprises a measuring head with a pulse inductor (1) of variable magnetic field and the detector (2) of stray field (5) mounted directly one by one at a small distance (AL) from each other along cords (4) and along direction of motion (V) of rope (3).
- the inductor (1) may be of eddy current or induction type, while the detector (2) contains measuring elements reacting to magnetic field intensity variations, preferably a Hall effect sensor or a thin film element.
- magnetic field generated by inductor (1) maintains intensity guaranteeing effective operation of detector (2) resulting in detection of flaws in cords (4) constituting the steel structure of rope (3).
- the signal from detector (2) representing variations of stray field (5) generated by a decrease of cross-section area of cords (4) is transferred to the signal processing block (6) and, after filtration, further to the signal analyser (7).
- Measuring zone of the head covers the whole width of rope (3), and the result defining indirectly the local tension strength of rope (3) is compared to a nominal reference level value. Results of inspection concerning technical condition of rope (3) are registered in a database stored in data carrier (9) and may be presented graphically if necessary.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
A system for continuous detection of cord defects in flat steel-plastic elevator ropes comprises an integrated measuring head with pulsed inductor (1) of variable magnetic field and detector (2) of stray field (5), a signal processing block (6), a signal analyser (7) and a data carrier (8). The inductor (1) and the detector (2) are situated over the surface of the rope (3), deployed along cords (4) and along direction of motion (V) of the rope (3) one by one at a small distance (AL) from each other.
Description
System for continues detection of cord defects in flat steel-plastic elevator ropes
The present invention relates to a diagnostic system for continuous detection of cord defects in flat steel-plastic ropes to be used particularly for the purpose of operating inspection of passenger elevators and goods lifts as well as conveyor belts reinforced with steel cords and circular cross-section cables used in cableway transport systems.
Recent development in the vertical transport technology resulted in introduction of systems eliminating the upper machinery room and employing ropes in the form of flat bands made of steel cords arranged in parallel and fixed with respect to each other by means of covering them with an elastic plastic, typically polyurethane. In the year 200, OTIS company has introduced an new solution for passenger elevator drive systems known as Gen2, using a gearless power winch and steel-polyurethane ropes in the form of 3 mm-thick tension bands with 12 cords, each 1.5 mm in diameter and made of 7 strands spliced in turn of 7 zinc-plated steel wires with diameter of 0.175 mm and embedded in polyurethane. Safety regulations applicable to rope-based transport systems impose special requirements in scope of particularly careful inspection concerning condition of their load-carrying components. The solution revealed in the European patent application EP2299251 uses the magnetic energy for diagnosing degradation of cords in flat steel- plastic ropes. The measuring head has permanent magnets that generate continuously, as the belt- shaped rope moves, a constant magnetic field with its circuit being closed through steel cords along the rope section between longitudinally deployed N-S poles. The measurement of variations in the magnetic field intensity taken by the detector directly over the N-S region provides a picture of homogeneity and continuity of the rope's internal ferromagnetic structure through which the magnetic field lines are being closed. The head comprises a number of measuring systems assigned to each of the cords such that signals from detectors of those individual systems are electronically processed, successively, in a signal processing block and an analyser, and then registered in a data carrier. The results allows to determine technical condition of the rope with possibility to identify, by means of an encoder, the location in which the tension strength of the rope is deteriorated. Similar measuring system is employed in solution presented in description of Polish patent application PL207764 designed for on-line monitoring and location of defects in a reinforced belt lapping joints of a long conveyor composed of a large number of
sections connected to each other with their ends by means of vulcanisation or adhesive bonding. Solutions with heads generating permanent magnetic field and the circuit being closed along the rope are difficult to integrate in conditions where a belt-shaped rope's width is in the range 30-60 mm with small distance typically maintained between them.
The system for continuos detection of cord defects in flat steel-plastic elevator ropes according to the present invention is provided, just like as in the solution described above, with an integrated measuring head comprising a magnetic filed source and a field intensity sensor, a signal processing block, a signal analyser, and a data storage. The essence of the solution consists in that the measuring head comprises a variable magnetic field pulse inductor and a stray field detector situated over the surface and deployed along the cords along direction of motion of the rope one by one at a small distance from each other.
The measuring head encompasses preferably the whole width of the rope, giving thus, in the above-described operating conditions, a result representing the local tension strength for the whole rope length.
In particularly difficult operation conditions, wireless transmission of data between the signal processing block and the analyser, and possibly also between the analyser and the data carrier may turn out to be a preferable solution.
In the system according to the present invention, a defect is represented by a variation of intensity of stray field induced around the cords in the zone directly adjacent to the location where pulsed magnetic field variations occur. The assumed small distance between the stray field detector and the inductor is a guarantee for high damage detectability. At the same time, analysis of the detector's signal converted into information on field pulsation resulting from periodic structure of strands allows to determine the rope velocity thus eliminating the need of using an encoder.
The invention is illustrated below by an example embodiment of the system for continuos detection of cord defects in flat steel-polyurethane rope presented schematically in the figure.
The system comprises a measuring head with a pulse inductor (1) of variable magnetic field and the detector (2) of stray field (5) mounted directly one by one at a small distance (AL) from each other along cords (4) and along direction of motion (V) of rope (3). The inductor (1) may be of eddy current or induction type, while the detector (2) contains measuring elements reacting to magnetic field intensity variations, preferably a Hall effect sensor or a thin film element. At a small distance (AL), magnetic field generated by inductor
(1) maintains intensity guaranteeing effective operation of detector (2) resulting in detection of flaws in cords (4) constituting the steel structure of rope (3). The signal from detector (2) representing variations of stray field (5) generated by a decrease of cross-section area of cords (4) is transferred to the signal processing block (6) and, after filtration, further to the signal analyser (7). Measuring zone of the head covers the whole width of rope (3), and the result defining indirectly the local tension strength of rope (3) is compared to a nominal reference level value. Results of inspection concerning technical condition of rope (3) are registered in a database stored in data carrier (9) and may be presented graphically if necessary.
Claims
Patent Claims
A system for continuos detection of cord defects in flat steel-plastic elevator ropes comprising an integrated measuring head with a magnetic field source and a field intensity sensor, signal processing block, signal analyser and data carrier, characterised in that its measuring head is composed of pulsed inductor (1) generating variable magnetic field and detector (2) of stray field (5) situated over the surface and deployed along cords (4) and along direction of motion (V) of rope (3) one by one at a small distance (AL) from each other.
A system according to claim 1 characterised in that the measuring head (1, 2) encompasses the whole width of rope (3).
A system according claim 1 characterised in that the signal processing block (6) is connected wirelessly with analyser (7).
A system according to any of claims 1 or 2 characterised in that the analyser (7) is connected wirelessly with data carrier (8).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL396732A PL396732A1 (en) | 2011-10-24 | 2011-10-24 | Non-stop faulty cables detection system in flat steel and plastic cords |
| PLP.396732 | 2011-10-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2013062428A1 true WO2013062428A1 (en) | 2013-05-02 |
Family
ID=47351908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/PL2012/000110 WO2013062428A1 (en) | 2011-10-24 | 2012-10-22 | System for continuous detection of cord defects in flat steel-plastic elevator ropes |
Country Status (2)
| Country | Link |
|---|---|
| PL (1) | PL396732A1 (en) |
| WO (1) | WO2013062428A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019137489A (en) * | 2018-02-08 | 2019-08-22 | 東芝エレベータ株式会社 | elevator |
| EP3587331A1 (en) * | 2018-06-25 | 2020-01-01 | Otis Elevator Company | Health monitoring of elevator system tension members |
| CN112881512A (en) * | 2021-01-12 | 2021-06-01 | 西南大学 | Cable-stayed bridge cable broken wire monitoring method and system based on magnetic field |
| CN115497260A (en) * | 2022-08-08 | 2022-12-20 | 天津城建大学 | Bridge cable defect early warning device for magnetic flux leakage and visual analysis |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL207764A1 (en) | 1978-06-20 | 1980-01-28 | Przed Montazu I Dostaw Piecow | |
| GB2152218A (en) * | 1983-12-30 | 1985-07-31 | Akad Gorniczo Hutnicza | Device for magnetic inspection of the belts of belt conveyors |
| US20050285588A1 (en) * | 2004-06-25 | 2005-12-29 | Gopichand Katragadda | Method and apparatus for testing material integrity |
| EP2253954A2 (en) * | 2009-05-20 | 2010-11-24 | PRÜFTECHNIK Dieter Busch AG | Device and Method for Inductive Measurements - Reconstruction of Signal |
| EP2299251A1 (en) | 1999-03-29 | 2011-03-23 | Otis Elevator Company | Method and apparatus for detecting elevator rope degradation using electrical or magnetic energy |
-
2011
- 2011-10-24 PL PL396732A patent/PL396732A1/en not_active Application Discontinuation
-
2012
- 2012-10-22 WO PCT/PL2012/000110 patent/WO2013062428A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL207764A1 (en) | 1978-06-20 | 1980-01-28 | Przed Montazu I Dostaw Piecow | |
| GB2152218A (en) * | 1983-12-30 | 1985-07-31 | Akad Gorniczo Hutnicza | Device for magnetic inspection of the belts of belt conveyors |
| EP2299251A1 (en) | 1999-03-29 | 2011-03-23 | Otis Elevator Company | Method and apparatus for detecting elevator rope degradation using electrical or magnetic energy |
| US20050285588A1 (en) * | 2004-06-25 | 2005-12-29 | Gopichand Katragadda | Method and apparatus for testing material integrity |
| EP2253954A2 (en) * | 2009-05-20 | 2010-11-24 | PRÜFTECHNIK Dieter Busch AG | Device and Method for Inductive Measurements - Reconstruction of Signal |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019137489A (en) * | 2018-02-08 | 2019-08-22 | 東芝エレベータ株式会社 | elevator |
| EP3587331A1 (en) * | 2018-06-25 | 2020-01-01 | Otis Elevator Company | Health monitoring of elevator system tension members |
| US11884516B2 (en) | 2018-06-25 | 2024-01-30 | Otis Elevator Company | Health monitoring of elevator system tension members |
| CN112881512A (en) * | 2021-01-12 | 2021-06-01 | 西南大学 | Cable-stayed bridge cable broken wire monitoring method and system based on magnetic field |
| CN115497260A (en) * | 2022-08-08 | 2022-12-20 | 天津城建大学 | Bridge cable defect early warning device for magnetic flux leakage and visual analysis |
Also Published As
| Publication number | Publication date |
|---|---|
| PL396732A1 (en) | 2013-04-29 |
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