Digital weighing sensor capable of redounding and self-compensating deflection influence and method thereof

Abstract

The invention relates to a load cell, which can return and compensate influence of an axle center of the load cell deviated from centrifugal force direction. The load cell comprises a casing in which a weighing sensing unit, a inclination angle sensing element, a storage unit and a calibration and deflexion compensation operation unit are arranged at least, and a data transmission interface unit. The load cell measures weight of object by a electric connection way and outputs a digital signal representing practical weight. A return and self-compensation method of the load cell includes measuring a included angle theta of axle center direction of the load cell and centrifugal force direction by utilizing the inclination angle sensing element, measuring weight of object by utilizing the weighing sensing unit to generate a sensing value Wr, calculating Wr / costheta to obtain a correction value W by utilizing the calibration and deflexion compensation operation unit, and respectively outputting digital signals representing included angle theta and deflexion correction value W through the data transmission interface. The invention can greatly increase precision of large-scale measurement equipment such as loadometer and tank scale, and simplify correction and maintenance work of pound weight equipment.

Description

technical field [0001] The invention relates to a weighing sensor, especially a digital weighing sensor capable of reporting and self-compensating for deflection effects and a method thereof. Background technique [0002] The load cell is a basic component for measuring the weight of objects, which is widely used in people's livelihood and industrial fields, such as weighing scales, pricing, counting scales, platform scales, belt scales, floor scales, tank scales and various industrial scales. [0003] Taking the application of the weighbridge station as an example, 6 to 8 load cells should be installed on each weighing station. In addition to adjusting the level of each load cell to make the load of individual load cells tend to be consistent, attention must also be paid to maintaining its axis in the same direction as the gravitational force. If it is deflected during installation or after use, its The sensed value will be distorted. [0004] The weighing platform of the...

AI Technical Summary

Problems solved by technology

[0005] The current calibration method of the weighbridge station is to calibrate the value by applying a standard weight on the scale platform. The impact on the axis deviation of the load cell is only a general correction, and it cannot be accurately targeted at individual load cells. to calibrate the error

[0006] Taking the application of large tank scales as an example, the maximum weighing range of some tank scales is as high as several tons, tens of tons or even hundreds of tons, and it is difficult to use standard weights for calibration. There is not enough space for weights, so adjustment becomes a headache

Due to the difficulty of calibration, the allowable range of the measurement error of the tank scale is as high as 1 / 500, while the error of the weighbridge station is only 1 / 3000

[0007] In fact, any artificial installation work cannot guarantee that each load cell can be without the slightest deflection.

Images