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Hysteresis Method for Reducing Ferromagnetic Elastic Body of Load Cell

A load cell, ferromagnetic technology, used in the testing/calibration of weighing equipment, weighing equipment and instruments using elastically deformable parts, etc., to achieve the effect of improving weighing accuracy, simple processing technology, and reducing lag

Active Publication Date: 2011-12-28
METTLER TOLEDO (CHANGZHOU) PRECISION INSTR CO LTD +2
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Problems solved by technology

The technique of improving the hysteresis performance of load cells by reducing the magnetoelastic internal friction of ferromagnetic elastomers has not been reported so far

Method used

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  • Hysteresis Method for Reducing Ferromagnetic Elastic Body of Load Cell
  • Hysteresis Method for Reducing Ferromagnetic Elastic Body of Load Cell
  • Hysteresis Method for Reducing Ferromagnetic Elastic Body of Load Cell

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Embodiment Construction

[0027] The method for reducing the hysteresis of the ferromagnetic elastic body of the load cell in the present invention firstly makes the ferromagnetic elastic body 1 into the required shape through machining and heat treatment, such as figure 2 , 3 The cylindrical ferromagnetic elastomer shown in the figure can be made by 17-4PH. The dimensions of the column ferromagnetic elastic body are 100-200mm×15-20mm×15-20mm in length, width and height, and the strain gauge 3 is fixed on the iron At the sensitive beam 2 of the magnetic elastic body, the strain gauge 3 can be pasted on the sensitive beam 2 in a conventional manner, and magnetic bodies 4 are respectively fixed on the opposite sides of the sensitive beam 2 of the ferromagnetic elastic body 1, and the two sides The magnetic body 4 forms a magnetic field in the same direction, that is, N poles or S poles are arranged in the same direction, and the direction of the magnetic field is parallel to the length direction of the ...

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Abstract

The invention relates to a method for reducing the hysteresis of a ferromagnetic elastic body of a load cell. The strain gauge is fixed on a sensitive beam of the ferromagnetic elastic body; magnetic bodies are respectively fixed on opposite sides of the sensitive beam of the ferromagnetic elastic body, or Magnetic bodies are fixed on both sides of the ferromagnetic elastic body covering the sensitive beam, and the magnetic bodies on both sides form a magnetic field in the same direction. The direction of the magnetic field is parallel to the length direction of the ferromagnetic elastic body. The ferromagnetic elastomer reaches the magnetic saturation state, so that the orientation of the magnetic domains in the ferromagnetic elastomer is consistent, and the magnetoelastic internal friction generated during the elastic deformation process of the ferromagnetic elastomer is eliminated. The present invention pre-magnetically saturates the ferromagnetic elastic body. When the ferromagnetic elastic body is loaded with force, because the orientation of the magnetic domains in the ferromagnetic elastic body has been consistent, the domain wall no longer moves and the magnetic moment no longer rotates, thereby eliminating the magnetoelasticity. The hysteresis produced by internal friction in the elastomer improves the accuracy of the load cell.

Description

technical field [0001] The invention relates to a method for reducing the hysteresis of a ferromagnetic elastic body of a load cell, and belongs to the technical field of load cell manufacturing. Background technique [0002] The resistance strain type load cell is composed of an elastic body, a strain gauge and a detection circuit. The strain gauge is attached to the sensitive beam of the elastic body. The resistance value of the wire grid of the strain gauge changes, and the conversion between the loading stress and the electrical signal is realized through the detection circuit, and the weighing is realized. And hysteresis means that the load cell is loaded step by step from no load to the rated load, and then unloaded step by step from the rated load. At the same load, the load cell unloading and loading output difference, see figure 1 shown. Usually, relative hysteresis error is used to express the hysteresis characteristic of the load cell, that is, the ratio of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01G23/01G01G3/12
Inventor 朱向群张惠斌朱子健杨莉徐志勇
Owner METTLER TOLEDO (CHANGZHOU) PRECISION INSTR CO LTD
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