Bolt combination surface dynamic stress monitoring device

Abstract

The invention aims to provide a bolt combination surface dynamic stress monitoring device. The bolt combination surface dynamic stress monitoring device is characterized in that a PVDF piezoelectric type stress monitoring sensor is placed at the combination surface of two monitored workpiece bolts, a shell of the PVDF piezoelectric type stress monitoring sensor is provided with a lead through hole, a wire is connected with a signal acquisition processing circuit through the lead through hole, the signal acquisition circuit is used for amplifying, filtering and wirelessly transmitting a dynamicstress signal, through holes used in cooperation with a double-head stud are formed in an upper workpiece and a lower workpiece, the PVDF piezoelectric type stress monitoring sensor comprises a concave protection shell, an insulation pressing connection layer, a conductive layer, a PVDF piezoelectric film and a wiring terminal, the signal acquisition processing circuit comprises a charge amplification circuit, a voltage amplification circuit, a filter circuit and a wireless signal transmission circuit. According to the bolt combination surface dynamic stress monitoring device, the structure is simple, the size is small, the operation is convenient, bolt combination surface dynamic stress implementation monitoring can be achieved, through the wireless transmission, the use space can be saved, and the wiring trouble can be reduced.

Description

technical field [0001] The invention relates to a stress monitoring device, in particular to a dynamic stress monitoring device for a bolt joint surface. Background technique [0002] In the fields of marine engineering, road and bridge pipelines, petrochemical industry, mechanical equipment and other fields, various parts are usually connected by bolts, welding and riveting, and most structures and equipment are connected by bolts. There is a contact surface between the connected parts, and the stress distribution of the bolted contact surface has an important impact on the service life of the bolt, the structural seal, and the stability of the mechanical system. The force on the contact surface of the bolt connection is relatively complicated. It not only has to bear alternating loads and temperature changes, but also transmits the unbalanced force generated by the operation of mechanical equipment. The weakest link of many mechanical systems mainly comes from the contact ...

AI Technical Summary

Problems solved by technology

The device adopts a vertical frame, and uses the pressure sensor between the nut and the test piece to realize the test of tightening torque, clamping force and pressure distribution between joint surfaces under different tightening methods, different test pieces, and different bolt distribution conditions, but the utility model Contains a large number of components such as test brackets, drive mechanisms, and brief description mechanisms

Application No. 201410629432.9 obtains the joint surface stress distribution indirectly by measuring the adjacent side stress. The system includes pressure sensors, strain gauges, pressure-sensitive paper and scanners. This invention needs to combine the stress distribution measured by scanning the pressure-sensitive paper and the strain gauge. Measuring the stress to obtain the stress distribution of the joint surface, the operation is more inconvenient

[0004] The structure of the above-mentioned existing bolt stress monitoring device is relatively complicated. Considering the limited installation space of mechanical equipment, it brings great inconvenience to the stress monitoring of the joint surface.

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