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Strain beam type soil pressure sensor

An earth pressure sensor and strain beam technology, applied in the field of pressure detection, can solve problems such as large errors and unsatisfactory results, and achieve the effects of preventing sensor damage, high reliability and high precision

Inactive Publication Date: 2011-07-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the stiffness of the soil is usually between rigidity and flexibility, so this kind of earth pressure sensor is very accurate when calibrated in water, but it often produces large errors when measuring the earth pressure, especially when measuring the soil with high stiffness With earth pressure, the results are less than ideal

Method used

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  • Strain beam type soil pressure sensor
  • Strain beam type soil pressure sensor
  • Strain beam type soil pressure sensor

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Embodiment Construction

[0015] With reference to accompanying drawing, further illustrate the present invention:

[0016] The strain beam type earth pressure sensor includes a hollow shell and a cover plate 1 that closes the shell. The inner cavity of the shell is provided with an elastic beam 6 and a force transmission shaft 3. The bottom of the shell is provided with a circle upward An extended step 12, the elastic beam 6 is erected on the step 12;

[0017] The upper and lower surfaces of the elastic beam 6 are provided with the same resistance strain gauges 5 and the matching terminal board 4 with the resistance strain gauges 5, and the described resistance strain gauges 5 are connected by wires to form a Wheatstone electrical connection. bridge, the Wheatstone bridge is connected to the strain gauge through a connecting wire 9, and the housing is provided with a through hole 10 that allows the connecting wire 9 to pass through;

[0018] The force transmission shaft 3 is arranged between the elas...

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Abstract

The invention provides a strain beam type soil pressure sensor comprising a hollow shell and a cover plate for sealing the shell, wherein the internal chamber of the shell is internally provided with an elastic beam and a transmission shaft; a circle of steps that extend upwards are arranged at the bottom of the shell; the elastic beam is arranged on the steps; the upper surface and the lower surface of the elastic beam are provided with resistance strain gauges with the same resistance and terminal boards that are matched with the resistance strain gauges; the resistance strain gauges are connected with one another by conducting wires so as to form a Wheatstone bridge that is connected with a strain gauge by a connecting wire; the shell is provided with a through hole that can allow the connecting wire to pass out; the transmission shaft is arranged between the elastic beam and the cover plate; one end of the transmission shaft is contacted with the cover plate; and the other end of the transmission shaft is contacted with the elastic beam. The strain beam type soil pressure sensor has the advantages of being applicable to soil pressure measurement on the soil of various stiffness, and being capable of eliminating the temperature influence.

Description

technical field [0001] The invention relates to the field of pressure detection, specifically a strain beam type earth pressure sensor. technical background [0002] The measurement of earth pressure is an important aspect of soil mechanics theory and experimental research, and it is also an important content in engineering testing. However, the existing earth pressure cell cannot measure the actual earth pressure well. In addition to the influence of various factors in the soil to distort the data measured by the earth pressure cell, the earth pressure cell itself also has shortcomings in principle. The existing membrane type earth pressure cell includes a box body, a box cover, and an elastic diaphragm formed by opening a concave surface in the box body, and the measurement of the earth pressure is realized through the resistance strain gauge applied on the elastic diaphragm. The structure of this earth pressure cell makes it only suitable for the measurement of completel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/22
Inventor 王奎华马少俊武登辉吴文兵罗永健王宁
Owner ZHEJIANG UNIV
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