A weighing piezoelectric sensor, its preparation method and expressway weighing system

Abstract

The invention discloses a weighing piezoelectric sensor, a manufacturing method thereof and a highway weighing system. The weighing piezoelectric sensor comprises a pressure transmission structure, aprestressed clamping plate, a quartz piezoelectric crystal and a signal conditioning circuit, wherein the prestressed clamping plate is composed of a bottom plate and two symmetric prestressed side plates, the quartz piezoelectric crystal is arranged above the bottom plate, and the two symmetric prestressed side plates clamps the pressure transmission structure above the quartz piezoelectric crystal; the quartz piezoelectric crystal is provided with an electrode and connected with the signal conditioning circuit through the electrode. The weighing piezoelectric sensor achieves weighing throughthe pressure transmission structure, the prestressed clamping plate and the quartz piezoelectric crystal to simplify the structure of the highway weighing system, and by converting measured analog signals into digital signals for transmission through the signal conditioning circuit, avoids distortion during a signal transmission process and improves the weighing precision.

Description

technical field [0001] The invention relates to the field of traffic supervision, in particular to a weighing piezoelectric sensor, a preparation method thereof and a highway weighing system. Background technique [0002] The highway weighing system is suitable for the highway weighing toll system, which can be used for overload control, overspeed control and road monitoring. At present, most of the load cells used on the road are bulky and require the help of heavy machinery during installation. The flow has a great influence and is likely to cause traffic congestion. For example: the whole vehicle weighing scheme, the distance between the center line of the dynamic weighing platform and the center line of the toll booth is about 20 meters. longer road. Others, such as the bent plate weighing scheme, are bulky, and the bending plate will produce plastic deformation after being rolled for a long time, which will reduce the accuracy, and the existing weighing scheme obtains ...

AI Technical Summary

Problems solved by technology

[0002] The expressway weighing system is suitable for the expressway toll-by-weight system, and can be used for overload control, overspeed control and road monitoring. At present, most of the load cells used on the road are bulky and require the help of heavy machinery during installation. The traffic flow has a great influence, and it is easy to cause traffic jams. For example: the whole vehicle weighing scheme, the distance between the center line of the dynamic scale and the center line of the toll booth is about 20 meters. long road

Others, such as the bending plate weighing scheme, are bulky, and the bending plate will produce plastic deformation after long-term rolling, which will reduce the accuracy, and the existing weighing scheme obtains and transmits analog signals, which will cause signal distortion

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