公开(公告)号：US20190188987A1

公开(公告)日：2019-06-20

申请号：US16221574

申请日：2018-12-16

Applicant: SHENZHEN UNIVERSITY

Inventor： Dong SU ,  Junjie HUANG ,  Zhongliang YU

IPC: G08B21/10 ,  G08B3/10

CPC classification number: G08B21/10 ,  G01V9/00 ,  G08B3/10

Abstract: A simple alarm for underground soil loss, includes an insulating installing box and an alarm loop, a rotating shaft is disposed in the insulating installing box; the rotating shaft is provided with a spring torque gauge; a bottom end of the rotating shaft is connected with a pozidriv cross recessed plate head; the spring torque gauge is connected with a first conductive metal sheet; the insulating installing box is connected with a second conductive metal sheet; the second conductive metal sheet is disposed on a motion track formed by that the first conductive metal sheet moves around the rotating shaft; the spring torque gauge, the first and second conductive metal sheets are positioned in the insulating installing box; the pozidriv cross recessed plate head is positioned outside the insulating installing box; and the first and second conductive metal sheets are arranged on the alarm loop.

公开(公告)号：US20180306653A1

公开(公告)日：2018-10-25

申请号：US15771386

申请日：2016-03-30

Applicant: SHENZHEN UNIVERSITY

Inventor： Dong SU ,  Yueqin JIANG ,  Xiaohua BAO ,  Zhongliang YU

IPC: G01L1/08 ,  G01N33/24 ,  G01L1/02

CPC classification number: G01L1/083 ,  G01L1/02 ,  G01L1/08 ,  G01N33/24

Abstract: A zero-strain soil pressure sensor includes a shell provided with a hydraulic oil cavity and a cavity located below the hydraulic oil cavity, a processor, an outer elastic film arranged at the upper end of the hydraulic oil cavity, an inner elastic film arranged between the hydraulic oil cavity and the cavity, an outer strain bridge circuit connected with the outer elastic film, an inner strain bridge circuit connected with the inner elastic film, a piston communicated with the hydraulic oil cavity, and a driving mechanism connected with the piston. The outer strain bridge circuit, the inner strain bridge circuit and the driving mechanism are electrically connected with the processor. The invention has the beneficial effect that the piston is driven by the driving mechanism to control the oil pressure in the hydraulic oil cavity, external soil pressure is balanced through the oil pressure to keep the outer elastic film in an non-deforming state all the time, and only the inner elastic film is deformed, so that the soil arch effect and soil displacement are avoided, and thus the liquid pressure measured by the inner elastic film is the soil pressure, and the measurement result is more accurate.