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Encapsulated weighing cell with eccentric load error adjustment

A weighing sensor and error technology, applied in the field of weight measuring instruments, to achieve the effect of avoiding temperature rise

Active Publication Date: 2009-11-18
METTLER TOLEDO (CHANGZHOU) PRECISION INSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The only possibility now is to compensate for these variations by means of expensive measurements in a signal processing unit connected to the sensor

Method used

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  • Encapsulated weighing cell with eccentric load error adjustment
  • Encapsulated weighing cell with eccentric load error adjustment
  • Encapsulated weighing cell with eccentric load error adjustment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] Figure 1A The gravimetric measuring instrument 100 in the first embodiment is shown in a sectional view seen from the side. The weight measuring instrument 100 includes a load cell 110 , a circuit module 130 , a processor module 140 and an input / output unit 150 . The load cell 110 has a parallel guide 111 whose fixed parallelogram legs 114 are mounted on a solid ground 199 via a support 198 . The load cell 110 also includes a movable parallelogram leg 115, which is connected to a load receiver 197, for example to a load pan. The movable parallelogram leg 115 is guided in vertical movement and is connected to the fixed parallelogram leg 114 by means of an upper parallelogram guide mechanism 113 and a lower parallelogram guide member 112 . A flexible pivot 116 is formed in the connection area between the parallel guide members 112 , 113 and the parallelogram legs 114 , 115 . Measurement transducers, more particularly strain gauges 117 , are arranged in each connection ...

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PUM

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Abstract

A gravimetric measuring instrument has a weighing cell and a flexible, tubular-shaped encapsulation. The weighing cell has a parallel-guiding mechanism and at least one measurement transducer. The ends of the encapsulation are attached, respectively, to the stationary parallelogram leg and the movable parallelogram leg, so that at least the parallel-guiding mechanism and the measurement transducerare enclosed by the encapsulation, protecting them from dirt and humidity. In some aspects, the parallel-guiding mechanism has an adjustment region formed at one of the parallelogram legs which allows adjustment of the distance between at least one flexure pivot of the upper parallel-guiding member and a flexure pivot of the lower parallel-guiding member. This adjustment region is mechanically connected to at least one adjustment-setting area, which is arranged outside the encapsulation and allows changes to be made to the adjustment region.

Description

technical field [0001] The invention relates to a weight (gravity) measuring instrument, in particular to a packaged load cell. Background technique [0002] Many gravimetric measuring instruments have parallel guides. The parallel guide mechanism includes at least one fixed and one movable parallelogram leg, and at least one upper and one lower parallel guide member. The weighing pan supported and guided in the vertical direction by the movable parallelogram legs receives the weighed load, wherein the force exerted by the load on the weighing pan is transmitted to the measuring transducer either directly or via a force-balancing linkage (measurement transducer). The parallel guide, the force transmission system and the measuring transducer form essentially the load cell of the gravimetric measuring instrument. The current state of the art includes load cells, such as load cells with strain gauges, load cells with vibrating strings or load cells with electromagnetic force...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01G23/01G01G3/13G01G3/16
CPCG01G21/244G01G3/1412G01G21/30G01G3/1414
Inventor R·黑费利J-C·埃默里H-R·布克哈德
Owner METTLER TOLEDO (CHANGZHOU) PRECISION INSTR CO LTD
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