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Large-scale 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: 2020-06-05
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-scale bolt rotation angle monitoring system and method based on passive RFID
  • Large-scale bolt rotation angle monitoring system and method based on passive RFID
  • Large-scale 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 reflection 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 tag. In each state, only one or two electronic tag information can be read by the reader Read.

[0046] The 32 tags are written with their respective number information in advance. An RFID card reader is fixed directly above the bolt, which can only read the information of the label not covered by the shielding sleeve, but cannot read the information of the label covered by the shielding sleeve.

[0047] The shielding sleeve is made of lightweight metal material, which can shield electromagnetic signals. The inner hole of the shielding sleeve has a regular hexagonal shape, and is connected with the hexagonal nut through the shape body. The scheme of this embodiment selects an ultra-high frequency RFID system with a frequency range of 300 MHz to 3 GHz, and a typical frequency value of 433 MHz....

Embodiment 2

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

[0059] The working principle of the second embodiment is the same as that of the first embodiment, and there is only a difference in the system layout.

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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 method of mechanical structure connection, which is widely used in various mechanical equipment. However, due to the harsh working environment of most mechanical equipment, especially in the environment with severe vibration, the bolt connection often loosens. If it is not handled in time, serious accidents such as equipment damage and even casualties are likely to occur. [0003] At present, there are mainly three common anti-loose methods of bolts: friction anti-loose, mechanical anti-loose and permanent anti-loose. Mechanical anti-loose and friction anti-loose are called detachable anti-loose, and permanent anti-loose is called non-detachable anti-loose. [0004] Common frictional anti-loosening methods are: spring washer, double nut anti-loosen...

Claims

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Application Information

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Patent Type & Authority Patents(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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