Piezoresistive bolt looseness intelligent monitoring device

Abstract

The invention relates to a piezoresistive bolt looseness intelligent monitoring device, which is used for monitoring the axial pre-tightening force of a bolt fastener, and comprises a base with a standard threaded hole in the center, the upper surface of the base is provided with an annular groove-shaped upper cavity, and after a piezoresistive module is arranged in the upper cavity, the upper cavity is pressed and fixed through a pressure-bearing sheet. The lower surface of the base is provided with an arc-shaped groove-shaped lower cavity, a power supply module, a signal processing module and a signal transmission module are respectively arranged in the lower cavity and then are packaged through a detachable rear cover, the piezoresistive module is respectively connected with the power supply module and the signal processing module, and the signal transmission module is connected with the signal processing module. Compared with the prior art, the device has the advantages of no influence on the original bolt connecting strength, simple structure, low cost and the like.

Description

technical field [0001] The invention relates to the technical field of pressure sensing, in particular to a piezoresistive intelligent monitoring device for bolt loosening. Background technique [0002] At present, in the fields of mechanical engineering, civil engineering, and rail transit, there is a large demand for the installation of connection and fastening of structural parts. As far as bolts are commonly used at present, it is necessary to apply certain force to the bolts when performing connection and fastening operations on components. Pre-tightening force, for important connection occasions, it requires precise control of the pre-tightening force, but due to factors such as vibration, thermal expansion and contraction, the bolts and nuts may rotate relative to each other, resulting in loosening of the bolt connection, which in turn leads to bolt pre-tightening The force changes and cannot meet the expected pre-tightening force requirements, so it is necessary to u...

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Problems solved by technology

[0002] At present, in the fields of mechanical engineering, civil engineering, and rail transit, there is a large demand for the installation of connection and fastening of structural parts. As far as bolts are commonly used at present, it is necessary to apply certain force to the bolts when performing connection and fastening operations on components. Pre-tightening force, for important connection occasions, it requires precise control of the pre-tightening force, but due to factors such as vibration, thermal expansion and contraction, the bolts and nuts may rotate relative to each other, resulting in loosening of the bolt connection, which in turn leads to bolt pre-tightening The force changes and cannot meet the expected pre-tightening force requirements, so it is necessary to use various detection methods to detect the pre-tightening force of the bolted connection so that it can be maintained in time

[0003] At present, the common bolt anti-loosening detection sensors mainly include strain gauge type, capacitive type, grating type, ultrasonic type, etc. in principle. Although these sensors can detect the change of bolt pretightening force to a certain extent, most of them will Changes to the structure of one or more of the gaskets, bolts, and nuts may affect the strength of the bolted fasteners and cause difficulties in the manufacture of standard bolted fasteners, resulting in their manufacturing The process is more complicated and the production cost increases

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