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Large-sized bolt rotation angle monitoring system and method based on passive RFID

A technology of rotation angle and monitoring system, applied in measuring devices, instruments, electrical devices, etc., can solve the problems that the system cannot automatically alarm, time-consuming and labor-intensive, etc.

Active Publication Date: 2018-01-30
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But they have a common problem, that is, when the bolts are loose, the system cannot automatically alarm, and it is necessary to arrange regular inspections, which is time-consuming and laborious

Method used

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  • Large-sized bolt rotation angle monitoring system and method based on passive RFID
  • Large-sized bolt rotation angle monitoring system and method based on passive RFID
  • Large-sized bolt rotation angle monitoring system and method based on passive RFID

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 1 As shown, 32 anti-metal reflective RFID tags are evenly pasted around the bolts, the shielding sleeve is fixed on the nut, and the lower edge of the sleeve covers the tags. In each state, only one or two electronic tag information can be read by the card reader read.

[0046] The 32 tags are pre-written with their own serial number information. An RFID card reader is fixed directly above the bolt, and the card reader can only read the information of the tags not covered by the blocking sleeve, but not the information of the tags covered by the blocking sleeve.

[0047] The shielding sleeve is a lightweight metal material that shields electromagnetic signals. The inner hole of the shielding sleeve is in the shape of a regular hexagon, and is connected with the hexagonal nut through physical fit. In the scheme of this embodiment, a UHF RFID system is selected, the frequency range is 300MHz-3GHz, and a typical frequency of 433MHz is selected.

[0048] ...

Embodiment 2

[0058] Such as figure 2 As shown, the monitoring system in the embodiment also includes a nut sleeve, 24 RFID tags are evenly pasted on the wall of the nut sleeve, and the nut sleeve and the hexagon nut are connected by form fit. The shielding sleeve is fixed on the periphery of the nut sleeve, and only one or two electronic tag information can be read by the card reader in each state.

[0059] The working principle of embodiment 2 is the same as that of embodiment 1, and there is only a difference in system arrangement.

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Abstract

The invention discloses a large-sized bolt rotation angle monitoring system and method based on passive RFID. The monitoring system comprises RFID tags, a shielding sleeve and an RFID card reader. TheRFID tags are arranged around a bolt or a nut. The shielding sleeve is arranged on the nut, covers the RFID tags and is provided with an opening. Only one or two tags are not shielded by the shielding sleeve. The RFID card reader is arranged directly above the bolt, and is configured to read tag information uncovered by the shielding sleeve, and to determine a bolt rotation angle according to thetag information. The system and method can automatically recognize the looseness of the bolt and can calculate the looseness angle of the bolt, saves time and labor compared with a traditional way ofinspecting at regular intervals, and provides a new solution for monitoring large-sized bolts under harsh environment.

Description

technical field [0001] The invention relates to bolt monitoring technology, in particular to a large-scale bolt rotation angle monitoring system and method based on passive RFID. Background technique [0002] Bolt connection is a common mechanical structure connection method, which is widely used in various mechanical equipment. However, due to the harsh working environment of most mechanical equipment, especially in environments with severe vibrations, bolted connections often loosen. If it is not handled in time, it is easy to cause serious accidents such as equipment damage and even casualties. [0003] At present, there are three main methods of bolt anti-loosening: frictional anti-loosening, mechanical anti-loosening and permanent anti-loosening. Mechanical anti-loosening and friction anti-loosening are called detachable anti-loosening, while permanent anti-loosening is called non-removable anti-loosening. [0004] The common frictional anti-loosening methods are: sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/30
Inventor 吴键周剑何旭峰周建荣马骏峰
Owner NANJING UNIV OF SCI & TECH
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