A piezoelectric sensor pretensioning device

Abstract

The invention provides a piezoelectric sensor pre-tightening device, belongs to the field of sensors and measuring and control devices of the sensors and particularly relates to application of a piezoelectric quartz sensor in the field of three-dimensional force measurement. The piezoelectric sensor pre-tightening device consists of a stress block, an upper three-dimensional piezoelectric sensor, a lower three-dimensional piezoelectric sensor, a stud, a nut, an upper press block, a lower press block and a plurality of T-shaped groove nuts. The piezoelectric sensor pre-tightening device eliminates interference brought by pre-tightening force change by using the two sensors, avoids direct contact between an elastic pre-tightening part and the stress block, accordingly eliminates the influence on outputting, of the pre-tightening force change, when the pre-tightening part is stressed to deform, and improves consistency and accuracy of area measurement. The piezoelectric sensor pre-tightening device can perform three-dimensional force measurement, and a reliable measurement area can be further expanded through combined usage. The piezoelectric sensor pre-tightening device is simple in structure, easy to adjust, flexible and convenient to use and wide in application.

Description

technical field [0001] The invention belongs to the field of sensors and measurement and control devices thereof, in particular to the application of piezoelectric quartz sensors in the field of three-dimensional force measurement. Background technique [0002] At present, the methods of preloading piezoelectric quartz sensors at home and abroad mainly include gravity preloading and elastic preloading. Among them, gravity preload requires heavy objects to provide gravity and the direction of preload force is single. Not only is the magnitude of gravity that can be provided limited, but in some applications, mechanisms such as pulleys and levers are required to change the direction of force, making the force measuring structure become Complex and difficult to realize; the traditional elastic preloading method mainly applies the required preloading force to the sensor through preloading bolts, elastic rings and other structures, but in the process of measurement, with the appl...

AI Technical Summary

Problems solved by technology

Among them, gravity preload requires heavy objects to provide gravity and the direction of preload force is single. Not only is the magnitude of gravity that can be provided limited, but in some applications, mechanisms such as pulleys and levers are required to change the direction of force, making the force measuring structure become Complex and difficult to realize; the traditional elastic preloading method mainly applies the required preloading force to the sensor through preloading bolts, elastic rings and other structures, but in the process of measurement, with the application of external force, the elastic structure is deformed As a result, the preload is changed, which introduces interference, and in severe cases, the signal will be distorted

Therefore, although the traditional elastic preload method is widely used, it still limits the precision and accuracy of the piezoelectric force measuring structure.

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