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    • 22. 发明授权
    • Bending beam load cell with torque sensitivity compensation
    • 弯曲梁称重传感器具有转矩灵敏度补偿
    • US06910392B2
    • 2005-06-28
    • US10368347
    • 2003-02-20
    • Harry E. LockeryRobert L. Gray
    • Harry E. LockeryRobert L. Gray
    • G01G3/14G01L1/04
    • G01G3/1414G01G3/1412
    • A bending beam load cell can be compensated for side-to-side off center load sensitivity by simple electrical adjustments if a pair of shear sensing strain gages are bonded to each bending beam midway between axial strain gages used to measure bending strains. The shear sensing strain gages measure torque on the load cell, and are incorporated in bridge circuits that make it possible to vary the amount of torque sensitivity correction by changing the value of a trimming resistor. The bridge circuits also include circuit components for compensation of front-to-back off center load error and for zero adjustment. Four strain gages on each bending beam can be part of a single composite strain gage element, so the shear sensing strain gages do not add any cost to the load cell. Such a load cell can also be hermetically sealed before any compensation of offset load errors is done.
    • 如果在用于测量弯曲应变的轴向应变计之间中间的每个弯曲梁上粘合了一对剪切感应应变计,则可以通过简单的电气调整来补偿弯曲梁称重传感器的侧向偏心荷载灵敏度。 剪切感应应变片测量称重传感器上的扭矩,并且被并入桥接电路中,使得可以通过改变微调电阻器的值来改变转矩灵敏度校正量。 桥接电路还包括用于补偿前后偏心负载误差和零调整的电路部件。 每个弯曲梁上的四个应变计可以是单个复合应变计元件的一部分,因此剪切传感应变计不会对测力传感器造成任何成本。 在完成偏移负载误差的任何补偿之前,这样的称重传感器也可以被密封。