Column type polar distance variable capacitance weighing sensor

A weighing sensor and pole-distance technology, which is applied to weighing equipment, instruments, weighing and other directions using elastically deformable parts, can solve the problems of unstable working state of the sensor, reduce measurement sensitivity, etc., and achieve low mechanical loss, The effect of short dynamic response time and large temperature changes

Inactive Publication Date: 2006-07-19
SHANGQIU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of stray capacitance not only reduces the measurement sensitivity, but also causes nonlinear output, and even makes the sensor in an unstable working state

Method used

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  • Column type polar distance variable capacitance weighing sensor

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Embodiment Construction

[0008] The specific embodiment of the present invention is described in detail now in conjunction with accompanying drawing:

[0009] The present invention is mainly composed of a load-bearing head 1, a moving column 4, a capacitor upper plate 5, a capacitor lower plate 6, a load-bearing spring 7, an outer cylinder 8, a base 9, and a lower plate seat 12.

[0010] The upper end of the moving column 4 and the load-bearing head 1 are screwed and fastened, the upper hole of the moving column 4 and the outer cylinder 8 is connected by a sliding key, and the capacitor upper plate 5 is pasted on the lower end;

[0011] The lower plate 6 of the capacitor is fixed on the lower plate seat 12; the load-bearing spring 7 is installed between the moving column 4 and the base 9;

[0012] The capacitor upper plate 5, the capacitor lower plate 6, and the load-bearing spring 7 are sealed and installed in the outer cylinder 8;

[0013] The screw 2 is screwed into the threaded hole on the upper ...

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PUM

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Abstract

The invention relates to a column type pole distance variable capacity weight-sensor used in electric weight system. It is formed by a weight-bearing head, a moving column, a capacity upper polar plate, a capacity lower polar plate, a weight-bearing spring, an outer cylinder and a bed and so on, wherein the capacity upper and lower polar plate and the weight-bearing spring are sealed fixed inside the outer cylinder. The gravity action of the object in on the weight-bearing head; it presses the weight-bearing spring by moving cylinder so that the condense deformation of the weight-bearing spring makes the distance between the capacity upper and lower polar plates short and the capacity value between the capacity upper and lower polar plate larges. It uses the external capacity testing circuit to measure the capacity value between the capacity upper and lower polar plate to obtain the weight value of the object.

Description

1. Technical field [0001] The invention relates to a capacitive sensor for electronic weighing apparatus. 2. Background technology [0002] At present, resistance strain type load cells are widely used in electronic weighing instruments. Due to the limitation of strain limit, the relative change of the resistance of the metal strain wire of this resistance type sensor is generally less than 1%, and the resistance value of the strain wire is affected by temperature. very big. In contrast, the relative change in capacitance of capacitive sensors can be greater than 100%, so the measurement range is much larger; capacitive sensors generally use metal as electrodes and inorganic materials as insulating supports, so they can withstand large temperature changes. In addition, the capacitive sensor also has the advantages of high sensitivity, short dynamic response time, and small mechanical loss. [0003] The main reason why capacitive sensors are still rarely used is that the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01G7/00G01G3/12
Inventor 杨三序谢煜李晓伟于晓光殷保中徐树山刘翠梅
Owner SHANGQIU NORMAL UNIVERSITY
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