CN111579648A - Acoustic emission probe fixing device and method for measuring circumferential strain of test piece - Google Patents
Acoustic emission probe fixing device and method for measuring circumferential strain of test piece Download PDFInfo
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- CN111579648A CN111579648A CN202010564795.4A CN202010564795A CN111579648A CN 111579648 A CN111579648 A CN 111579648A CN 202010564795 A CN202010564795 A CN 202010564795A CN 111579648 A CN111579648 A CN 111579648A
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- 238000012360 testing method Methods 0.000 title claims abstract description 77
- 239000000523 sample Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 98
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 229920001875 Ebonite Polymers 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 abstract 1
- 239000011435 rock Substances 0.000 description 10
- 238000005259 measurement Methods 0.000 description 6
- 208000032370 Secondary transmission Diseases 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The invention discloses an acoustic emission probe fixing device and method for measuring circumferential strain of a test piece, and the acoustic emission probe fixing device comprises an annular rubber sleeve, a probe fixing seat and an annular strain measuring device, wherein the annular strain measuring device comprises a shell, a main transmission shaft, a driven transmission shaft, a clockwork spring, a dial and a non-elastic steel wire rope, the shell is fixed on the outer side of the annular rubber sleeve, the main transmission shaft is arranged in the shell, and two ends of the main transmission shaft are respectively movably connected with two side walls of the shell through bearings, so that the main transmission shaft can rotate in the shell; the spring is arranged on the main transmission shaft, and one end of the spring is fixedly connected with the main transmission shaft; the other end of the clockwork spring is fixedly connected with one end of the inelastic steel wire rope, and the other end of the inelastic steel wire rope enters the annular channel from the mounting hole, surrounds the annular channel for a circle and is fixed at the mounting hole. The invention can accurately obtain the strain in the mechanical loading process of the test piece under the condition that the test piece has heterogeneity, and is convenient for recycling the test device after the test.
Description
Technical Field
The invention relates to an acoustic emission probe fixing device and method for measuring circumferential strain of a test piece, and belongs to the technical field of rock mass mechanics experiments.
Background
Understanding the mechanical properties, deformation and failure laws of rocks and rocks, and the various physical and mechanical effects of various structures on rocks is a main source of engineering design construction parameters. In order to obtain the influence degree of the structural characteristics of the rock mass on the mechanical properties of the rock mass, a laboratory gradually adopts a research idea of combining quantitative numerical measurement and analysis with a rock mass mechanical action mechanism, however, in the current test process, glue is adopted to paste the acoustic emission probe and the strain gauge on the surface of the test piece, so that the acoustic emission probe and the strain gauge are difficult to take down after the test is finished, and the strain gauge can only perform strain measurement on the part where the test piece is pasted because the test piece has heterogeneity (namely the heterogeneity can cause different strain quantities at different positions), and finally, the experimental error is larger. Therefore, how to accurately obtain the strain amount in the mechanical loading process of the test piece under the condition that the test piece is anisotropic, and the test device is convenient to recycle after the test is a problem to be solved urgently in the industry.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the acoustic emission probe fixing device and the acoustic emission probe fixing method for measuring the circumferential strain of the test piece, so that the strain in the mechanical loading process of the test piece can be accurately obtained under the condition that the test piece is heterogeneous, and the test device can be conveniently recycled after the test.
In order to achieve the purpose, the invention adopts the technical scheme that: an acoustic emission probe fixing device for measuring the circumferential strain of a test piece comprises an annular rubber sleeve, a probe fixing seat and an annular strain measuring device,
an annular channel is arranged in the annular rubber sleeve, a mounting hole is formed in the surface of the annular rubber sleeve and communicated with the annular channel, and the inner diameter of the annular rubber sleeve is slightly smaller than the diameter of the cylindrical test piece;
the two probe fixing seats are symmetrically fixed on two sides of the annular rubber sleeve by taking the axis of the annular rubber sleeve as a center, and the probe fixing seats are hollow cylinders with notches;
the annular strain measuring device comprises a shell, a main transmission shaft, a driven transmission shaft, a clockwork spring, a dial and a non-elastic steel wire rope, wherein the shell is fixed on the outer side of the annular rubber sleeve, and the mounting hole is formed in the shell; the spring is arranged on the main transmission shaft, and one end of the spring is fixedly connected with the main transmission shaft; the other end of the clockwork spring is fixedly connected with one end of the inelastic steel wire rope, and the other end of the inelastic steel wire rope enters the annular channel from the mounting hole, surrounds the annular channel for a circle and is fixed at the mounting hole; the driven transmission shaft is arranged in the shell, and two ends of the driven transmission shaft are respectively movably connected with two side walls of the shell through bearings, so that the driven transmission shaft can rotate in the shell; the dial is arranged on the outer side of the shell, and the pointer of the dial is in transmission connection with one end of the driven transmission shaft; the main transmission shaft is provided with a main transmission gear, the driven transmission gear is arranged on the driven transmission rod, the main transmission gear is meshed with the driven transmission gear, and the circumference of the driven transmission gear is larger than that of the main transmission gear.
Furthermore, the annular rubber sleeve and the probe fixing seat are both made of elastic hard rubber.
Further, the circumference of the annular scale of the dial is the same as the circumference from the transmission gear. By adopting the structure, the rotating displacement of the slave transmission gear is the same as the displacement of the pointer rotating the dial when the pointer rotates along with the slave transmission shaft, so that the scale of the dial is refined, and the experiment precision is improved.
A use method of an acoustic emission probe fixing device for measuring hoop strain of a test piece comprises the following specific steps:
A. according to the circumferential length ratio of the slave transmission gear and the master transmission gear, the annular strain amount corresponding to each scale on the dial is obtained in advance;
B. selecting a cylindrical test piece as a test piece to be tested, and sleeving the annular rubber sleeve of the acoustic emission probe fixing device on the outer circumferential surface of the test piece to be tested to ensure that the annular rubber sleeve is in interference fit with the test piece to be tested;
C. after the acoustic emission device is connected, two acoustic emission probes are respectively arranged in the probe fixing seat, face to a piece to be tested and are tightly pressed on the outer side of the annular rubber sleeve;
D. after the installation is finished, reading the scale value of the current pointer through the dial, and recording the scale value as an initial value;
E. starting a loading instrument, carrying out a mechanical property loading test on the axial direction of a test piece, receiving and recording energy waves transmitted from the interior of the test piece in real time by an acoustic emission probe in the loading process, simultaneously carrying out radial deformation and expansion on the test piece in the loading process, carrying out annular expansion on an annular rubber sleeve along with the radial deformation of the test piece to be tested, enabling a non-elastic steel wire rope to be stressed and stretched, and increasing the elasticity of a clockwork spring due to the fact that the other end of the non-elastic steel wire rope is fixed and the other end of the clockwork spring is tensioned by one; at the moment, one end of the spring of the clockwork drives the main transmission shaft to rotate under the action of elasticity, the main transmission shaft enables the auxiliary transmission shaft to start rotating through the transmission of the main transmission gear and the auxiliary transmission gear, and then the pointer rotates in the dial disc;
F. after the loading test is finished, stopping the loading instrument, reading the scale value of the current pointer through the dial at the moment, and recording the scale value as a measured value;
G. and (4) making a difference between the measured value and the initial value to obtain the annular strain quantity of the current test piece after the loading test.
Compared with the prior art, the invention adopts a mode of combining the annular rubber sleeve, the probe fixing seat and the annular strain measuring device, and has the following advantages:
1. the acoustic emission test and the annular strain measurement of the cylindrical test piece in the rock mechanical loading process are concentrated on the same cross section, and the strain measurement is not carried out at an independent position but is carried out on the whole annular strain quantity on the same cross section, so that the influence of the heterogeneity of the test piece on the strain measurement is avoided, the strain quantity in the test piece mechanical loading process is accurately obtained, and data support is provided for researching the relation between the elastic potential energy absorbed when the test piece is loaded and the energy released by the rock collected by the acoustic emission device.
2. According to the invention, because the perimeter of the slave transmission gear is larger than that of the master transmission gear, namely the rotating speed of the master transmission shaft is larger than that of the slave transmission shaft, when the expansion suddenly occurs in the rock loading process, the master transmission shaft can rapidly rotate under the elastic force of the spring, and after the transmission of the master transmission gear and the slave transmission gear, the slave transmission shaft can rotate slowly, so that the pointer is driven to slowly rotate in the dial, the rapid expansion of the test piece can be converted into the stable rotation of the pointer, and the measurement error in the experiment is effectively reduced.
3. When in test, the device is sleeved on the outer circumferential surface of a cylindrical test piece and is in interference fit; because the gluing of no glue, can conveniently take off after consequently accomplishing, acoustic emission probe sets up in the probe fixing base simultaneously, also compresses tightly fixedly, also does not adopt glue fixed, can conveniently take off from the acoustic emission probe after consequently experimental completion, finally realizes the quick recovery of this device and recycles.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a left side view of the present invention;
FIG. 4 is a top view of the present invention;
FIG. 5 is a sectional view taken along line A-A in FIG. 2;
FIG. 6 is a sectional view taken along line B-B in FIG. 4;
fig. 7 is a sectional view taken along line C-C in fig. 4.
In the figure: 1. the device comprises an annular rubber sleeve 1.1, an annular channel 1.2, a mounting hole 2, a probe fixing seat 3, an annular strain measuring device 3.1, a main transmission shaft 3.2, a main transmission gear 3.3, a secondary transmission shaft 3.4, a secondary transmission gear 3.5, a clockwork spring 4, a dial, 5 and a non-elastic steel wire rope.
Detailed Description
The present invention will be further explained below.
As shown in fig. 1 to 7, an acoustic emission probe fixing device for measuring hoop strain of a test piece comprises an annular rubber sleeve 1, a probe fixing seat 2 and an annular strain measuring device 3,
an annular channel 1.1 is arranged in the annular rubber sleeve 1, a mounting hole 1.2 is formed in the surface of the annular rubber sleeve 1, the mounting hole 1.2 is communicated with the annular channel 1.1, and the inner diameter of the annular rubber sleeve 1 is slightly smaller than the diameter of the cylindrical test piece;
the number of the probe fixing seats 2 is two, the two probe fixing seats 2 are symmetrically fixed on two sides of the annular rubber sleeve 1 by taking the axis of the annular rubber sleeve 1 as the center, and the probe fixing seats 2 are hollow cylinders with notches;
the annular strain measuring device 3 comprises a shell, a main transmission shaft 3.1, a secondary transmission shaft 3.3, a clockwork spring 3.5, a dial 4 and a non-elastic steel wire rope 5, wherein the shell is fixed on the outer side of the annular rubber sleeve 1, the mounting hole 1.2 is positioned in the shell, the main transmission shaft 3.1 is arranged in the shell, two ends of the main transmission shaft 3.1 are respectively movably connected with two side walls of the shell through bearings, and the main transmission shaft 3.1 can rotate in the shell; a clockwork spring 3.5 is arranged on the main transmission shaft 3.1, and one end of the clockwork spring 3.5 is fixedly connected with the main transmission shaft 3.1; the other end of the clockwork spring 3.5 is fixedly connected with one end of the inelastic steel wire rope 5, and the other end of the inelastic steel wire rope 5 enters the annular channel 1.1 from the mounting hole 1.2, encircles a circle along the annular channel 1.1 and is fixed at the mounting hole 1.2; the driven transmission shaft 3.3 is arranged in the shell, and two ends of the driven transmission shaft 3.3 are respectively movably connected with two side walls of the shell through bearings, so that the driven transmission shaft 3.3 can rotate in the shell; the dial 4 is arranged outside the shell, and a pointer of the dial 4 is in transmission connection with one end of the driven shaft 3.3; the main transmission shaft 3.1 is provided with a main transmission gear 3.2, the driven transmission shaft 3.3 is provided with a driven transmission gear 3.4, the main transmission gear 3.2 is meshed with the driven transmission gear 3.4, and the perimeter of the driven transmission gear 3.4 is larger than that of the main transmission gear 3.2.
Furthermore, the annular rubber sleeve 1 and the probe fixing seat 2 are both made of elastic hard rubber.
Further, the circumference of the annular scale of the scale disk 4 is the same as the circumference from the transmission gear 3.4. By adopting the structure, the rotating displacement of the pointer along with the transmission shaft 3.3 can be ensured to be the same as the displacement of the pointer rotating through the dial 4 from the transmission gear 3.4, thereby refining the scale of the dial 4 and improving the experimental precision.
A use method of an acoustic emission probe fixing device for measuring hoop strain of a test piece comprises the following specific steps:
A. according to the ratio of the circumference of the slave transmission gear 3.4 to the circumference of the master transmission gear 3.2, the annular strain amount corresponding to each scale on the dial 4 is obtained in advance;
B. selecting a cylindrical test piece as a test piece to be tested, and installing an annular rubber sleeve 1 of the acoustic emission probe fixing device on the outer circumferential surface of the test piece to be tested to enable the annular rubber sleeve 1 to be in interference fit with the test piece to be tested;
C. after the acoustic emission device is connected, two acoustic emission probes are respectively arranged in the probe fixing seat 2, face to a piece to be tested and are tightly pressed on the outer side of the annular rubber sleeve 1;
D. after the installation is finished, reading the scale value of the current pointer through the dial 4, and recording the scale value as an initial value;
E. starting a loading instrument, carrying out a mechanical property loading test on the axial direction of a test piece, receiving and recording an energy wave transmitted from the interior of the test piece in real time by an acoustic emission probe in the loading process, simultaneously carrying out radial deformation and expansion on the test piece in the loading process, carrying out annular expansion on an annular rubber sleeve 1 along with the radial deformation of the test piece to be tested, enabling a non-elastic steel wire rope 5 to be stressed and stretched, and increasing the elasticity of a clockwork spring 3.5 due to the fact that the other end of the non-elastic steel wire rope 5 is fixed and one end of the non-elastic steel wire rope 5 applies a pulling force to; at the moment, one end of a clockwork spring 3.5 is under the action of elasticity to drive a main transmission shaft 3.1 to rotate, the main transmission shaft 3.1 drives a secondary transmission shaft 3.3 to start to rotate through the transmission of a main transmission gear 3.2 and a secondary transmission gear 3.4, and then a pointer rotates in a dial 4;
F. after the loading test is finished, stopping the loading instrument, reading the scale value of the current pointer through the dial 4 at the moment, and recording the scale value as a measured value;
G. and (4) making a difference between the measured value and the initial value to obtain the annular strain quantity of the current test piece after the loading test.
Claims (4)
1. An acoustic emission probe fixing device for measuring the circumferential strain of a test piece is characterized by comprising an annular rubber sleeve, a probe fixing seat and an annular strain measuring device,
an annular channel is arranged in the annular rubber sleeve, a mounting hole is formed in the surface of the annular rubber sleeve and communicated with the annular channel, and the inner diameter of the annular rubber sleeve is slightly smaller than the diameter of the cylindrical test piece;
the two probe fixing seats are symmetrically fixed on two sides of the annular rubber sleeve by taking the axis of the annular rubber sleeve as a center, and the probe fixing seats are hollow cylinders with notches;
the annular strain measuring device comprises a shell, a main transmission shaft, a driven transmission shaft, a clockwork spring, a dial and a non-elastic steel wire rope, wherein the shell is fixed on the outer side of the annular rubber sleeve, and the mounting hole is formed in the shell; the spring is arranged on the main transmission shaft, and one end of the spring is fixedly connected with the main transmission shaft; the other end of the clockwork spring is fixedly connected with one end of the inelastic steel wire rope, and the other end of the inelastic steel wire rope enters the annular channel from the mounting hole, surrounds the annular channel for a circle and is fixed at the mounting hole; the driven transmission shaft is arranged in the shell, and two ends of the driven transmission shaft are respectively movably connected with two side walls of the shell through bearings, so that the driven transmission shaft can rotate in the shell; the dial is arranged on the outer side of the shell, and the pointer of the dial is in transmission connection with one end of the driven transmission shaft; the main transmission shaft is provided with a main transmission gear, the driven transmission gear is arranged on the driven transmission rod, the main transmission gear is meshed with the driven transmission gear, and the circumference of the driven transmission gear is larger than that of the main transmission gear.
2. The acoustic emission probe fixing device for measuring hoop strain of a test piece according to claim 1, wherein the annular rubber sleeve and the probe fixing seat are both made of elastic hard rubber.
3. The acoustic emission probe fixture for measuring hoop strain of a test piece of claim 1, wherein the circumference of the annular scale of the dial is the same as the circumference from the drive gear.
4. The use method of the acoustic emission probe fixing device for measuring the hoop strain of the test piece according to claim 1 is characterized by comprising the following specific steps:
A. according to the circumferential length ratio of the slave transmission gear and the master transmission gear, the annular strain amount corresponding to each scale on the dial is obtained in advance;
B. selecting a cylindrical test piece as a test piece to be tested, and sleeving the annular rubber sleeve of the acoustic emission probe fixing device on the outer circumferential surface of the test piece to be tested to ensure that the annular rubber sleeve is in interference fit with the test piece to be tested;
C. after the acoustic emission device is connected, two acoustic emission probes are respectively arranged in the probe fixing seat, face to a piece to be tested and are tightly pressed on the outer side of the annular rubber sleeve;
D. after the installation is finished, reading the scale value of the current pointer through the dial, and recording the scale value as an initial value;
E. starting a loading instrument, carrying out a mechanical property loading test on the axial direction of a test piece, receiving and recording energy waves transmitted from the interior of the test piece in real time by an acoustic emission probe in the loading process, simultaneously carrying out radial deformation and expansion on the test piece in the loading process, carrying out annular expansion on an annular rubber sleeve along with the radial deformation of the test piece to be tested, enabling a non-elastic steel wire rope to be stressed and stretched, and increasing the elasticity of a clockwork spring due to the fact that the other end of the non-elastic steel wire rope is fixed and the other end of the clockwork spring is tensioned by one; at the moment, one end of the spring of the clockwork drives the main transmission shaft to rotate under the action of elasticity, the main transmission shaft enables the auxiliary transmission shaft to start rotating through the transmission of the main transmission gear and the auxiliary transmission gear, and then the pointer rotates in the dial disc;
F. after the loading test is finished, stopping the loading instrument, reading the scale value of the current pointer through the dial at the moment, and recording the scale value as a measured value;
G. and (4) making a difference between the measured value and the initial value to obtain the annular strain quantity of the current test piece after the loading test.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010564795.4A CN111579648B (en) | 2020-06-19 | 2020-06-19 | Acoustic emission probe fixing device and method for measuring circumferential strain of test piece |
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| CN202010564795.4A CN111579648B (en) | 2020-06-19 | 2020-06-19 | Acoustic emission probe fixing device and method for measuring circumferential strain of test piece |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0313144D0 (en) * | 2003-06-07 | 2003-07-16 | Phoenix Inspection Systems Ltd | Ultrasonic inspection apparatus and method of using same for defect detection and/or direction finding |
| CN102808600A (en) * | 2012-07-11 | 2012-12-05 | 扬州东方吊架有限公司 | Constant force spring energy-saving oil production equipment |
| CN109490482A (en) * | 2018-12-05 | 2019-03-19 | 重庆大学 | A kind of device and method for simulating the compound dynamic disaster of deep coalmining |
| CN109632491A (en) * | 2019-01-24 | 2019-04-16 | 湖南科技大学 | It is a kind of for testing the device and its application method of test specimen tensile strength |
| CN212301437U (en) * | 2020-06-19 | 2021-01-05 | 湖南科技大学 | Acoustic emission probe fixing device for measuring hoop strain of test piece |
-
2020
- 2020-06-19 CN CN202010564795.4A patent/CN111579648B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0313144D0 (en) * | 2003-06-07 | 2003-07-16 | Phoenix Inspection Systems Ltd | Ultrasonic inspection apparatus and method of using same for defect detection and/or direction finding |
| CN102808600A (en) * | 2012-07-11 | 2012-12-05 | 扬州东方吊架有限公司 | Constant force spring energy-saving oil production equipment |
| CN109490482A (en) * | 2018-12-05 | 2019-03-19 | 重庆大学 | A kind of device and method for simulating the compound dynamic disaster of deep coalmining |
| CN109632491A (en) * | 2019-01-24 | 2019-04-16 | 湖南科技大学 | It is a kind of for testing the device and its application method of test specimen tensile strength |
| CN212301437U (en) * | 2020-06-19 | 2021-01-05 | 湖南科技大学 | Acoustic emission probe fixing device for measuring hoop strain of test piece |
Non-Patent Citations (1)
| Title |
|---|
| 王天中 等: "煤矿综采面红外探头可调固定装置研究", 《能源与节能》, no. 12, 31 December 2016 (2016-12-31), pages 46 - 47 * |
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