NDLI: Speed and position sensors for mine hoists and elevators

Content Provider	IEEE Xplore Digital Library
Author	Kovalchik, P.G. Duda, F.T.
Copyright Year	1995
Description	Author affiliation: Res. Center, US Bur. of Mines, Pittsburgh, PA, USA (Kovalchik, P.G.; Duda, F.T.)
Abstract	Mine hoist and elevator safety devices are tested periodically. However, periodic testing cannot ensure that a recently tested safety device will function properly when called upon. Ideally, the condition of critical safety devices should be continuously monitored but this is either impractical or impossible. The US Bureau of Mines is conducting research on the more practical approach of continuously monitoring the speed and position of the shaft conveyance. By monitoring the depth and speed of a conveyance and comparing the result with the appropriate speed curve, an operator can be warned before the curve is exceeded and may then take appropriate action. This information will also detect other hoisting malfunctions such as motor or brake problems. Monitoring the actual cage position during operation and comparing this with the position indicated by the winding drum will indirectly enable the detection of rope slip for friction hoists and slack rope in drum hoists. Hoist systems in use are typically not equipped with appropriate devices for directly monitoring actual cage speed and position. This paper discusses several types of speed and position sensors, and advantages and disadvantages of each. The research suggests methods to monitor actual speed and position of the cage, which can be very significant in preventing overspeed accidents resulting from safety device failures in mine hoists and elevators.
Starting Page	2054
Ending Page	2056
File Size	363096
Page Count	3
File Format	PDF
ISBN	0780330080
ISSN	01972618
DOI	10.1109/IAS.1995.530563
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-10-08
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Condition monitoring Shafts Safety devices Electrical safety Failure analysis Switches Inspection Elevators Accidents Testing
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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