A Hydraulic Calibration Loading Device for Adjustable Pretightening Piezoelectric Force Meter

Abstract

The invention designs a hydraulic calibration loading device for an adjustable pre-tightening piezoelectric force measuring instrument, which belongs to the field of sensors and their measurement and control. The device is composed of a loading cylinder liner, a loading plunger, a preload spring, a preload adjusting sleeve, a loading rod and a dynamic sealing ring. It can calibrate and load the load source and the piezoelectric dynamometer when the distance between the piezoelectric dynamometer and the piezoelectric dynamometer is far away; the preload adjustment sleeve can be used to adjust the preload of the loading plunger, reducing the The hysteresis of the small loading device during the return calibration of the piezoelectric dynamometer ensures that the loading plunger can return to the original position after the pressure is released, improving the test accuracy of the piezoelectric dynamometer.

Description

technical field [0001] The invention relates to the field of calibration and loading devices for piezoelectric dynamometers, in particular to remote calibration of piezoelectric dynamometers using hydraulic pressure to realize accurate application of loading force and automatic reset and pressure release. Background technique [0002] Piezoelectric dynamometer is a test instrument developed by the "piezoelectric effect" of piezoelectric quartz wafers that can measure unidirectional force, multi-dimensional force and vector force. Due to the excellent performance of piezoelectric dynamometer, it is Widely used in aerospace, medical equipment, robotics and other industries. Before the piezoelectric dynamometer is used, it needs to be statically calibrated by a calibration loading device to determine its static performance and the relationship between input and output, so the calibration loading device of the piezoelectric dynamometer is very important. [0003] At present, th...

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Problems solved by technology

The calibration of the moment by the weight type is done by turning the pulley. In order to maintain the accuracy, the rope must be kept horizontal or vertical. Larger force gauges for calibration

Aiming at the shortcoming that the weight type cannot calibrate a large range of force, a gantry type calibration device has appeared, which uses a large speed ratio worm gear reducer to apply the load, and uses the strain gauge attached to the rope to detect the magnitude of the applied force. The structure of the whole device is simple and convenient. The operation is convenient, and the six-dimensional force can be calibrated, but the force applied for the calibration is a composite force, which is not the real single-dimensional force required for calibration, which makes it difficult to achieve accurate calibration for force measuring instruments with interdirectional coupling; Although decoupling analysis can be theoretically performed, the decoupling analysis of single-dimensional force back calculation from composite force has lost the meaning of basic multi-dimensional force calibration, and the resulting error cannot be evaluated

For the idea that each direction of the piezoelectric dynamometer can be calibrated separately, the Sensing Institute of Dalian University of Technology has developed a multi-functional dynamometer calibration loader. The error caused by the intermediate mechanical transmission link is completely eliminated; with this device, not only can the load force calibration be applied to the three directions individually or simultaneously, but also the torque calibration can be performed on the dynamometer; The multi-dimensional force and moment of the large-range dynamometer is calibrated, and remote long-distance isolation calibration cannot be realized

The Hefei Materials Research Institute of the Chinese Academy of Sciences has developed a calibration device for six-dimensional force dynamometers. The load is applied by four jacks, and the independent loading of the forces and moments in each direction is achieved by changing the positions of the jacks and the dynamometer body. , but the disadvantage is that it is impossible to simply load the moment, which will bring great difficulties to the calibrated data processing

[0005] Therefore, in the field of calibration loading devices for piezoelectric dynamometers, there is a lack of a universal, simple, convenient and flexible operation, especially suitable for long-distance loading and self-pretension reset calibration loading devices

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