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Sensors 2016, 16(2), 168;

A Novel RFID-Based Sensing Method for Low-Cost Bolt Loosening Monitoring

School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Jiangsu Key Construction Laboratory of Modern Measurement Technology and Intelligent System, Huaiyin Normal University, Jiangsu 223300, China
Author to whom correspondence should be addressed.
Academic Editor: Chelakara Subramanian
Received: 11 September 2015 / Revised: 13 January 2016 / Accepted: 23 January 2016 / Published: 28 January 2016
(This article belongs to the Section Physical Sensors)
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In coal mines, bolt loosening in the cage guide is affected by the harsh environmental factors and cage hoist vibration, leading to significant threats to work safety. It is crucial, to this effect, to successfully detect the status of multipoint bolts of guide structures. This paper proposes a system to monitor bolt status in harsh environments established based on the RFID technique. A proof-of-concept model was demonstrated consisting of a bolt gearing system, passive UHF RFID tags, a reader, and monitoring software. A tinfoil metal film is fixed on the retaining plate and an RFID tag bonded to a large gear, with the bolt to be detected fixed in the center of a smaller gear. The radio-frequency signal cannot be received by the reader if the tag is completely obscured by the tinfoil, and if the bolt is loose, the tag’s antenna is exposed when the gear revolves. A radio-frequency signal that carries corresponding bolt’s information is transmitted by the RFID tag to the RFID reader due to coil coupling, identifying loose bolt location and reporting them in the software. Confirmatory test results revealed that the system indeed successfully detects bolt loosening and comparative test results (based on a reed switch multipoint bolt loosening monitor system) provided valuable information regarding the strengths and weaknesses of the proposed system. View Full-Text
Keywords: guide structure; UHF RFID; bolt loosening guide structure; UHF RFID; bolt loosening

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Wu, J.; Cui, X.; Xu, Y. A Novel RFID-Based Sensing Method for Low-Cost Bolt Loosening Monitoring. Sensors 2016, 16, 168.

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