title: A Novel RFID-Based Sensing Method for Low-Cost Bolt Loosening Monitoring.
abstract: 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.
authors.affiliation: School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. wuj@njust.edu.cn.|Jiangsu Key Construction Laboratory of Modern Measurement Technology and Intelligent System, Huaiyin Normal University, Jiangsu 223300, China. wuj@njust.edu.cn.
authors.forename: Jian
authors.initials: J
authors.lastname: Wu
authors.affiliation: School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. 18551742928@163.com.
authors.forename: Xingmei
authors.initials: X
authors.lastname: Cui
authors.affiliation: School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. 113101000162@njust.edu.cn.
authors.forename: Yunpeng
authors.initials: Y
authors.lastname: Xu
keywords: UHF RFID; bolt loosening; guide structure
references.citation: Sensors (Basel). 2014;14(8):14839-57
references.pmid: 25123466
references.citation: J Arthroplasty. 2010 Jun;25(4):660.e11-3
references.pmid: 19682838
references.citation: Sensors (Basel). 2014;14(5):8728-39
references.pmid: 24841250
references.citation: Sensors (Basel). 2015 Feb 26;15(3):4781-95
references.pmid: 25730482