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    • 2. 发明授权
    • Weight scale utilizing a capacitative load cell
    • 利用电容式称重传感器进行称重
    • US4629019A
    • 1986-12-16
    • US784858
    • 1985-10-04
    • Richard H. HarringtonCharles W. Krapf
    • Richard H. HarringtonCharles W. Krapf
    • G01G3/04G01G3/12G01G3/14H01G5/01H01G5/16H01G7/00
    • G01G3/12G01G3/04
    • A platform weight scale comprising a capacitative load cell sensing means configured to be insensitive to off center loading of the horizontal platform regardless of load amount or location on the platform. The platform is supported by a plurality of springs selected for equal spring rates. The load cell is electrically connected into a FET (Field Effect Transistor), CMOS (Complementary Metal Oxide Semiconductor) or Bi-Polar semiconductor multivibrator circuit selected and designed to sense electric currents on the order of 10.sup.-13 amperes. In one preferred embodiment the load cell comprises a grounded hemispherical surface opposing a flat charged plate. In alternate embodiments the load cell comprises a differential capacitor or a parallel plate capacitor suspended in a manner that is insensitive to off center loading. An additional embodiment for the load cell comprises a spherically concave surface opposing the above grounded hemispherical surface.A method for two point calibration of the scale without the use of calibration weights is provided. The method provides for weighing the empty weight table or platform for the zero point, weighing the scale without the platform and without disassembly by turning upside down and then recalibrating the scale at the two points or settings. The differential capacitor load cell embodiment utilizes an alternatin switch circuit as a part of the multivibrator circuit. As a third alternative, a frequency modulated system clock circuit that is modulated by the load cell capacitance or differential capacitance may be utilized as the weight sensing circuit and driver for peripheral attachments to the scale circuit.
    • 平台重量级包括电容式测力传感装置,其被配置为对水平平台的偏心负载不敏感,而与平台上的载荷量或位置无关。 平台由选择为相同弹簧刚度的多个弹簧支撑。 称重传感器被电连接到FET(场效应晶体管),CMOS(互补金属氧化物半导体)或双极半导体多谐振荡器电路中,该电路选择和设计用于检测10-13安培数量级的电流。 在一个优选实施例中,测力传感器包括与扁平带电板相对的接地半球形表面。 在替代实施例中,测力传感器包括以对偏心负载不敏感的方式悬挂的差分电容器或平行板电容器。 负载传感器的附加实施例包括与上述接地半球形表面相对的球形凹面。 提供了一种不使用校准砝码对刻度进行两点校准的方法。 该方法提供称量零点的空重量表或平台,在没有平台的情况下对秤进行称重,而不用拆卸上下颠倒,然后在两点或设置上重新校准秤。 差分电容器测力传感器实施例将交替开关电路用作多谐振荡器电路的一部分。 作为第三替代方案,由称重传感器电容或差分电容调制的调频系统时钟电路可以用作用于刻度电路的外围附件的权重检测电路和驱动器。
    • 3. 发明授权
    • Weight control system
    • 重量控制系统
    • US4129189A
    • 1978-12-12
    • US684255
    • 1976-05-07
    • Steve C. MaglecicLarry W. Oberholtzer
    • Steve C. MaglecicLarry W. Oberholtzer
    • G01D5/22G01G3/04G01G3/08G01G7/02G01G13/24G01G13/29G01G13/295G01G15/00G01G13/02G01G3/14
    • G01G15/006G01D5/2291G01G13/241G01G13/2912G01G13/2951G01G3/04G01G3/08G01G7/02
    • The system controls the weights of individual charges of product or material accumulated by feeding material, preferably at a high "bulk" flow rate and then at a relatively low "dribble" flow rate, into one or more buckets or hoppers. As material is accumulated within each bucket, the system compensates against the effects of vibrational forces and flow rate and, upon termination of material accumulation, it corrects dribble time and final weight by respectively adjusting the bulk and dribble weights for the next charge, all with respect to an electronically established set weight corresponding to the desired weight of each charge. A linear voltage differential transformer (LVDT) senses the position of each bucket and provides electrical signals which are utilized by interface and control circuitry to control charge weight and provide an internal reference. The control system is particularly suited for use in combination with packaging systems.
    • 系统控制通过饲料积累的产品或材料的个体电荷的重量,优选地以高的“大体积”流速然后以相对较低的“运球”流速进入一个或多个桶或料斗。 由于材料积聚在每个铲斗内,系统会补偿振动力和流量的影响,并且在材料积聚结束时,通过分别调整下次充电的体积和运球重量来校正运球时间和最终重量,全部与 相对于每个电荷的期望重量对应于电子建立的设定重量。 线性电压差动变压器(LVDT)检测每个铲斗的位置,并提供电气信号,由接口和控制电路用于控制电荷重量并提供内部参考。 控制系统特别适合与包装系统结合使用。