称重传感器的横向灵敏度及横向力补偿

Transverse sensitivity and force compensation of weighing load cell

称重传感器在大多数称量实践中,总是伴随出现横向力(力矩)的干扰,而产生横向灵敏度。本文分析了引起横向灵敏度的诸因素及其对称量结果的影响。指出横向灵敏度的大小取决于弹性元件的结构形状,压头、底垫、安装平台等附件的性能,若有5%的横向力存在,会在高准确度称重传感器中出现满量程±0.1%的偏差;在普通准确度称重传感器中出现±0.6%的偏差。并以圆柱式称重传感器为例,介绍了利用单层或双层环形膜片与弹性元件和外壳焊接,补偿横向力和弯曲力矩的原理和工艺方法,给出了圆形膜片的挠度和应力计算公式。

Weighing load cell, in most weighing in practice, is always accompanied by the interference of lateral force, to arise from the transverse sensitivity. This paper analyzes the impact of factors which cause and result of the symmetrical transverse sensitivity, pointes to the transverse sensitivity depends on the size of the elastic element. The performance of pressure head, base and platform and other accessories, if 5% of the existence of transverse force, will be in the high accurate weighing error full scale0.1% weighing load cell and in error 0.6% in average accuracy of weighing load cell. Based on the column type weighing load cell as an example, this paper introduces the use of single or double ring diaphragm and the elastic element and the casing is welded, and gives the calculation formula of deflection and stress of circular membrane.