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GB2000870A - Safety device for lifting magnets - Google Patents

Safety device for lifting magnets

Info

Publication number
GB2000870A
GB2000870A GB7829284A GB7829284A GB2000870A GB 2000870 A GB2000870 A GB 2000870A GB 7829284 A GB7829284 A GB 7829284A GB 7829284 A GB7829284 A GB 7829284A GB 2000870 A GB2000870 A GB 2000870A
Authority
GB
United Kingdom
Prior art keywords
magnet
load
lifting
transducer
output
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.)
Granted
Application number
GB7829284A
Other versions
GB2000870B (en
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.)
British Steel Corp
Original Assignee
British Steel Corp
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 British Steel Corp filed Critical British Steel Corp
Priority to GB7829284A priority Critical patent/GB2000870B/en
Publication of GB2000870A publication Critical patent/GB2000870A/en
Application granted granted Critical
Publication of GB2000870B publication Critical patent/GB2000870B/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/04—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by magnetic means

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Control And Safety Of Cranes (AREA)

Abstract

A safety device for a lifting magnet has sensor means 18,20 responsive to flux produced by the magnet in the magnetic circuit including the load 14 to be lifted, a transducer 22 responsive to the tension in the lifting wire or the like supporting the load and the magnet together with a comparator circuit 26 effective to compare signals from the sensor and from the transducer and to provide an output to an alarm and indicative of a safety margin between lifting tension and the force available for lifting: A device 30 measures the tilt of the magnet from the vertical and its output signal is combined in an amplifier 24 with that from the transducer 22 representing the weight of the load and the magnet. The combining amplifier 24 produces an output representing the combined effect ofthe total load and the tilt. The preferred magnetic field senser is an induction coil wound around a movable pole piece adjacent the load, from which the signal is integrated and squared. <IMAGE>
GB7829284A 1977-07-11 1978-07-10 Lifting magnets Expired GB2000870B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7829284A GB2000870B (en) 1977-07-11 1978-07-10 Lifting magnets

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2899777 1977-07-11
GB7829284A GB2000870B (en) 1977-07-11 1978-07-10 Lifting magnets

Publications (2)

Publication Number Publication Date
GB2000870A true GB2000870A (en) 1979-01-17
GB2000870B GB2000870B (en) 1982-01-27

Family

ID=26259683

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7829284A Expired GB2000870B (en) 1977-07-11 1978-07-10 Lifting magnets

Country Status (1)

Country Link
GB (1) GB2000870B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997003912A1 (en) * 1995-07-24 1997-02-06 Railfix N.V. System for manoeuvring a magnetic load, in particular a ferromagnetic load
WO1997003911A1 (en) * 1995-07-24 1997-02-06 Railfix N.V. Electrical permanent-magnet system for manoeuvring a magnetic, particularly a ferromagnetic, load
EP2085349A1 (en) 2008-02-04 2009-08-05 Trumpf Werkzeugmaschinen GmbH + Co. KG Magnetic grabber
EP2769804B1 (en) 2013-02-22 2016-06-15 Stäubli Faverges Method for controlling the magnetic clamping of a part and magnetic clamping device using such a method
CN112777490A (en) * 2021-01-22 2021-05-11 大连美恒时代科技有限公司 Method and device for preventing hook slipping of crane
WO2021160324A1 (en) * 2020-02-11 2021-08-19 Tata Steel Ijmuiden B.V. Lifting system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997003912A1 (en) * 1995-07-24 1997-02-06 Railfix N.V. System for manoeuvring a magnetic load, in particular a ferromagnetic load
WO1997003911A1 (en) * 1995-07-24 1997-02-06 Railfix N.V. Electrical permanent-magnet system for manoeuvring a magnetic, particularly a ferromagnetic, load
EP2085349A1 (en) 2008-02-04 2009-08-05 Trumpf Werkzeugmaschinen GmbH + Co. KG Magnetic grabber
CN101567244B (en) * 2008-02-04 2012-12-05 通快机床两合公司 Magnetic grab bucket
EP2769804B1 (en) 2013-02-22 2016-06-15 Stäubli Faverges Method for controlling the magnetic clamping of a part and magnetic clamping device using such a method
WO2021160324A1 (en) * 2020-02-11 2021-08-19 Tata Steel Ijmuiden B.V. Lifting system
CN115087617A (en) * 2020-02-11 2022-09-20 塔塔钢铁艾默伊登有限责任公司 Lifting system
CN112777490A (en) * 2021-01-22 2021-05-11 大连美恒时代科技有限公司 Method and device for preventing hook slipping of crane
CN112777490B (en) * 2021-01-22 2023-05-09 大连美恒时代科技有限公司 Method and device for preventing hook slipping of crane

Also Published As

Publication number Publication date
GB2000870B (en) 1982-01-27

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19980709