Acoustic emission sensor

Patent metadata

Field	Value
Publication number	US-10794869-B2
Application number	US-201816016829-A
Country	US
Kind code	B2
Filing date	Jun 25, 2018
Priority date	Jun 23, 2017
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

The present invention discloses an acoustic emission sensor, including an acoustic emission probe, a probe installation mechanism, and a transmission mechanism transmitting a combination of the acoustic emission probe and the probe installation mechanism to a setting position in a borehole of a monitored rock mass; the probe installation mechanism includes a shell, a probe sleeve, a spring sleeve, a spring, and a fixed pulley component; the probe sleeve is installed in the guide cylinder of the shell, the spring sleeve is fixed on two sides of the probe sleeve, the spring is installed inside the spring sleeve; one end of the first rope in the fixed pulley component is fixedly connected to the end cap in the upper end surface of the probe sleeve through the fixed pulley mounted on the top of the inner wall of the shell.

First claim

What is claimed is:

1. An acoustic emission sensor, comprising at least one acoustic emission probe, at least one probe installation mechanism, and a transmission mechanism transmitting a combination of the acoustic emission probe and the probe installation mechanism to a setting position in a borehole of a monitored rock mass, and wherein a number of the probe installation mechanism is equal to a number of the acoustic emission probe;
wherein the probe installation mechanism comprises a shell, a probe sleeve, an end cap, two guide rods, two spring sleeves, two springs, and two baffles, a pin, a fixed pulley component and a connection component;
wherein the shell is a thin-walled cylindrical body with two open ends, a frame and a guide cylinder for combining with the probe sleeve are provided in an inner hole of the shell, the frame is located at a top of an inner wall of the shell, and the guide cylinder is located at a bottom of the inner wall of the shell, an inner hole of the guide cylinder is a through hole passing through a wall of the shell, and a first pin hole is arranged on a wall of the guide cylinder, a centerline of the frame is in line with a centerline of the guide cylinder and is perpendicular to a centerline of the shell;
wherein the probe sleeve is a cylinder with a closed lower end and an open upper end, an inner hole of the probe sleeve is in clearance fit with the acoustic emission probe, and an outer shape of the probe sleeve is in clearance fit with the inner hole of the guide cylinder, a lower end surface of the probe sleeve is an arc surface matched with an arc of the borehole of the monitored rock mass, a lower section of the probe sleeve is provided with a second pin hole combined with the guide cylinder, an upper wall of the probe sleeve is provided with one or two notches for a cable connector of the acoustic emission probe to protrude, if the upper wall of the probe sleeve is provided with two notches, the two notches are axially symmetrically distributed with respect to a centerline of the probe sleeve;
wherein each of the spring sleeves is a cylinder with two open ends, an inner wall of a lower end of each of the spring sleeves is provided with a slot combined with each of the baffles and is provided with a baffle outlet, the two spring sleeves are axially symmetrically fixed on an outer wall of the probe sleeve with respect to the centerline of the probe sleeve, and connecting line of projections of centerlines of the two spring sleeves on a horizontal plane is perpendicular to a projection of a centerline of the notch on the horizontal plane, two sets of connection components are respectively installed at two ends of the shell;
wherein the acoustic emission probe is installed in the probe sleeve, the cable connector of the acoustic emission probe extends from the notch arranged on the wall of the probe sleeve; the probe sleeve installed with the acoustic emission probe is paced in the shell, the lower section of the probe sleeve is inserted into the guide cylinder provided on the shell and a lower end of the probe sleeve is located outside the shell, an upper section of the probe sleeve is located in the frame provided on the shell, a placement orientation of the probe sleeve makes the cable connector of the acoustic emission probe face one of the two ends of the shell;
wherein the end cap covers an upper end surface of the probe sleeve and is detachably connected to the probe sleeve;
wherein the two baffles are respectively installed in the slot provided by the two spring sleeves and are connected with a third rope;
wherein first ends of the two guide rods are respectively connected with two side plates of the frame provided in the shell, and second ends of the two guide rods are respectively inserted into the two spring sleeves;
wherein the two springs are respectively sleeved on the two guide rods, first ends of the two springs are respectively connected with plate bodies of corresponding parts of the frame, and second ends of the two springs are respectively contacted with corresponding baffles;
wherein the fixed pulley component comprises a fixed pulley and a first rope, the fixed pulley is installed on the top of the inner wall of the shell and is located in the frame;
wherein a first end of the first rope is connected with a central part of the end cap, and a second end of the first rope extends out of the shell after passing through the fixed pulley;
wherein a second rope is connected to the pin, the pin is inserted into the first pin hole of the guide cylinder and the second pin hole of the probe sleeve to connect the probe sleeve with the guide cylinder so that the springs are in a compressed state;
wherein the transmission mechanism is connected to the connection component mounted on the shell.

2. The acoustic emission sensor according to claim 1 , wherein the connection component comprises a nut and at least two sets of connection brackets, a first end of each of the connection brackets is evenly distributed around an outer wall of the nut and is hinged with the outer wall of the nut, a second end of each of the connection brackets is fixedly connected with the shell.

3. The acoustic emission sensor according to claim 2 , wherein the transmission mechanism comprises a transmission rod, a connection rod and a roller component;
wherein a connection screw hole is provided at a center of a first end of the transmission rod, and a connection hole is provided at a center of a second end of the transmission rod, a first fastening screw is provided on a wall of the connection hole, a type and a size of an internal thread of the connection screw hole are the same as a type and a size of an internal thread of the nut in the connection component;
wherein the connection rod comprises a threaded section and a column section, the connection rod is used for a connection of the transmission rod with the connection component and a connection between transmission rods, a type and a size of an external thread of the threaded section are matched with a type and a size of the internal thread of the connection screw hole provided on the transmission rod, a shape and a size of the column section are matched with a shape and a size of the connection hole provided in the transmission rod, when the column section of the connection rod is inserted into the connection hole of the transmission rod, the column section of the connection rod and the connection hole are fixed by the first fastening screw;
wherein the roller component comprises a roller, an U-shaped installation plate, an axle and a roller sleeve, a number of rollers are two or three, a number of the U-shaped installation plate and a number of axle are the same as a number of the rollers, each of the rollers is respectively mounted on a corresponding axle, two ends of each axle are respectively mounted on two side plates of a corresponding U-shaped installation plate so that each roller is located between the two side plates of the corresponding U-shaped installation plate; a diameter of an inner hole of the roller sleeve is larger than an outer diameter of the transmission rod, a second fastening screw is arranged on a wall of the roller sleeve, each U-shaped installation plate is fixedly attached to an outer wall of the roller sleeve; when the number of the U-shaped installation plate are two, an included angle between centerlines of the two U-shaped installation plates is 120° to 135°; when the number of the U-shaped installation plate are three, centerlines of two U-shaped installation plates are in a straight line, and included angles between a centerline of remaining U-shaped installation plate and the centerlines of the two U-shaped installation plates are both 90°;
wherein each transmission rod is provided with at least one set of roller component, the roller sleeve of the

Assignees

• Univ Sichuan
• Res Institute Of Petroleum Exploration & Development Petrochina Company Limited

Inventors

• Liu Jianfeng
• Xu Huining
• Pei Jianliang
• Wang Lu
• Wang Chunping
• Lei Xiaozhang
• Fu Wenxi
• Deng Jianhui

Classifications

• G01N29/14 Primary

  using acoustic emission techniques {(echo of particles G01N29/046; measuring mechanical vibrations or acoustic waves in solids in general G01H1/00)} · CPC title

• E21B49/00 Primary

  Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells · CPC title

• E21B47/12

  Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling · CPC title

• G01N29/2475

  Embedded probes, i.e. probes incorporated in objects to be inspected · CPC title

• G01N29/22

  Details {, e.g. general constructional or apparatus details} · CPC title