Load cell assembly and weighing method

A technology of load cells and components, applied in weighing equipment, instruments, weighing and other directions using elastically deformable parts, can solve problems such as inapplicability and sensor system-level output errors

Active Publication Date: 2019-08-02
METTLER TOLEDO (CHANGZHOU) PRECISION INSTR CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In the patent US 20040251059A1, by pasting special strain gauges on the four planes of the beam-column sensor, a special bridge is used for error compensation, but this only eliminates the influence of process errors such as machining and patching, and has no System-level output errors caused by tilt are powerless
[0009] In addition, various existing compensation methods are basically aimed at special sensor structures, such as square cross-section beams. Due to the variety of existing sensor structures, these compensation methods do not have universal applicability

Method used

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  • Load cell assembly and weighing method
  • Load cell assembly and weighing method

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Embodiment Construction

[0034] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] refer to Figure 1 to Figure 4 , the load cell 1 provided by the present invention is preferably a column load cell with a rocking column structure. The load cell 1 includes an upper pressure bearing surface 2, an elastic element 3, a lower pressure bearing surface 4, a primary strain unit and a secondary strain unit. The lower pressure bearing surface 4 is opposite to the upper pressure bearing surface 2 . The elastic element 3 has a central axis 31 located between the upper bearing surface 2 and the lower bearing surface 4 . The upper pressure bearing surface 2 and the lower pressure bearing surface 4 of the load cell 1 respectively have a contact portion 6 in contact with the elastic element 3 , the position of which is related to the processing accuracy, inclination angle and radius of the ball head of the elastic element 3 . Ideally, the con...

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Abstract

The invention provides a weighing sensor assembly and a weighing method. The weighing sensor comprises an upper load bearing surface; a lower load bearing surface opposite to the upper load bearing surface; an elastic element having a center shaft, an included angle formed between the center shaft and a gravitational acceleration direction being an angle of inclination of the elastic element; a primary strain unit for measuring a first deformation amount of the elastic element for obtaining a weighing output; a secondary strain unit being at a first angle to the center shaft for measuring a second deformation amount of the elastic element, the first angle being obtained by setting the angle of inclination and the second deformation amount of the elastic element to meet a monotonic function relationship; and a calculation unit for calculating a weighing error based on the second deformation amount and using the weighing error for correcting the weighting output. The invention can compensate for the real-time error of the weighing output.

Description

technical field [0001] The invention relates to a weighing sensor component capable of realizing error compensation and a weighing method thereof. Background technique [0002] The load cell is a basic component for measuring the weight of an object. It converts the weight of the measured object into the deformation of the elastic element through a certain method, and then converts the deformation of the elastic element into an electrical signal for identification and measurement. Measure the weight of the object. [0003] The column sensor is a structural form that is widely used in the load cell, and the column sensor is the most widely used rocking column sensor. Compared with other sensor structures, it has unique advantages, such as simple and compact structure, high rigidity of elastic elements, fast dynamic response, strong overload resistance, etc. [0004] Taking the application of vehicle scales as an example, a vehicle needs to be equipped with 6 to 8 load cells...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01G3/13
Inventor 林鸿志吴建伟杨莉闻凤莲王继峰
Owner METTLER TOLEDO (CHANGZHOU) PRECISION INSTR CO LTD
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