Method for reducing lag of ferromagnetic elastomer of weighing sensor
A weighing sensor and ferromagnetic technology, which is applied in the testing/calibration of weighing equipment, weighing equipment and instruments using elastically deformable parts, etc., to achieve the effects of reducing manufacturing costs, improving weighing accuracy, and simple processing technology
Active Publication Date: 2010-06-16
METTLER TOLEDO CHANGZHOU PRECISION INSTR +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
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[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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The invention discloses a method for reducing lag of a ferromagnetic elastomer of a weighing sensor, which comprises the following steps: fixing a strain gauge at a sensitive beam of the ferromagnetic elastomer; and respectively fixing magnets on two opposite side faces of the sensitive beam of the ferromagnetic elastomer, or respectively fixing the magnets on two sides of the ferromagnetic elastomer covering the sensitive beam. The magnets on two sides form magnetic fields in the same direction which is parallel to the length direction of the ferromagnetic elastomer; and the ferromagnetic elastomer reaches a magnetic saturation state through the magnetic fields formed by the magnets on two sides so that the magnetic domain orientation in the ferromagnetic elastomer is consistent and magnetic elastic internal friction generated in a deformation process of the ferromagnetic elastomer is eliminated. The method performs pre-magnetic saturation processing on the ferromagnetic elastomer; and when the ferromagnetic elastomer is stressed to load, the magnetic domain orientation in the ferromagnetic elastomer is consistent and a domain wall does not move any more and a magnetic torque does not rotate any more, so the lag generated by the magnetic elastic internal friction in the elastomer is eliminated and the precision of the weighing sensor is improved.
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 ...
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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