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Digital linearization in a weighing cell

A heavy-duty, coil technology, applied in weighing equipment using electromagnetic balance, weighing equipment using elastically deformable parts, instruments, etc. multiple time issues

Active Publication Date: 2014-10-01
METTLER TOLEDO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the speed and accuracy of the method depend on the filter parameters, which are mutually exclusive in most cases, meaning that the accurate determination of the weighing result will take more time, conversely, the fast determination of the weighing result is inaccurate

Method used

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  • Digital linearization in a weighing cell
  • Digital linearization in a weighing cell
  • Digital linearization in a weighing cell

Examples

Experimental program
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Embodiment Construction

[0071] figure 1 The force-measuring cell of the force-measuring device 1 is schematically shown in a sectional view from the side. The force-measuring device 1 is mounted on the support structure by means of the fixing part 11 . The load receiving part 12 is connected to the stationary part 11 by two parallel rails 14, supporting a weighing pan 15 on which the weighing load is placed. The parallel rails 14 are connected to the load receiving part 12 and the fixed part 11 by flexible pivots 16 . The flexible pivot defines the axis of rotation, but in any lateral direction of the axis of rotation, the flexible pivot actually works as a rigid force-transmitting element. The force-measuring device 1 is not limited to the structure shown with the weighing pan on top, but can also be configured with the weighing pan arranged below, in most cases suspended by means of a hanger. The coupling 13 transmits the gravity force to the first lever arm of the balance beam 17 supported by t...

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PUM

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Abstract

A force exerted by a load is determined in a force-measuring device (1) operating under electromagnetic force compensation. The device includes a measurement transducer (18, 118) with a coil (20, 120) movably immersed in a magnet system (19, 119) and a force-transmitting mechanical connection between a load-receiving part (12, 112) and the coil or magnet system. A position sensor (21, 28), also part of the device, determines a displacement of the coil from its settling position relative to the magnet system (19, 119) which occurs when the load is placed on the load-receiving part. An electrical current (24) flowing through the coil generates an electromagnetic force between the coil and the magnet system whereby the coil and the load-receiving part are returned to, and / or held at, the settling position. The magnitude of current and the amount of displacement are used to determine the weight force exerted by the load.

Description

technical field [0001] The present invention relates to a method of determining a weight force by means of a force measuring device. Background technique [0002] In force measuring devices, eg of the load cell type, which work according to the principle of electromagnetic force compensation, also known as electromagnetic force recovery or EMFR, the gravimetric force of the weighing object is supported directly or via one or more fulcrums The force transmission lever transmits to the electromechanical measurement transducer. The measuring transducer generates a compensating force that matches the gravimetric force of the weighing object, and transmits an electrical signal, which is processed and displayed by the electronic aggregate-signal processing unit. [0003] EMFR load cells mostly consist of a parallelogram mechanism with a fixed parallel arm and a movable parallel arm that is connected by two parallel rails to the fixed parallel arm and acts as a load receiver. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01G7/02
CPCG01G7/02G01G7/04G01G3/1414
Inventor D·施拉格D·鲁普C·特劳特魏勒H-R·布克哈德
Owner METTLER TOLEDO INC