CN112526001A - Acoustic emission sensor contact device and method of use thereof - Google Patents
Acoustic emission sensor contact device and method of use thereof Download PDFInfo
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- CN112526001A CN112526001A CN202011578388.5A CN202011578388A CN112526001A CN 112526001 A CN112526001 A CN 112526001A CN 202011578388 A CN202011578388 A CN 202011578388A CN 112526001 A CN112526001 A CN 112526001A
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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
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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
- G01N29/223—Supports, positioning or alignment in fixed situation
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Abstract
The invention discloses an acoustic emission sensor contact device and a use method thereof, wherein the acoustic emission sensor contact device comprises a vertical support mechanism, a horizontal support mechanism and an acoustic emission sensor fixing mechanism, the vertical support mechanism comprises a magnetic suction seat, a support rod, a first rotating nut, a positioning ring, a positioning sleeve and a first spring, and the support rod is fixed on the magnetic suction seat; the horizontal supporting mechanism comprises a telescopic rod, a second spring, a third spring and a second rotating nut, and one end of the telescopic rod is fixed on the supporting rod through a positioning ring; the acoustic emission sensor fixing mechanism comprises a clamping groove and a third rotating nut, the telescopic rod is connected to the clamping groove through a spherical joint, and the acoustic emission sensor is fixed to the clamping groove. The invention can not only ensure the close contact of the acoustic emission sensors and the surface of the sample, but also realize the accurate positioning of the positions of the acoustic emission sensors, and improve the accuracy of the test measurement result on the basis of simple and easy operation.
Description
Technical Field
The invention belongs to the technical field of mechanical experiments, and relates to an acoustic emission sensor contact device for rocks, concrete and cemented grains and a using method thereof.
Background
In the field of civil engineering, acoustic emission detection techniques have been widely used for monitoring the damage evolution process of materials such as rocks, concrete and cemented granules. In laboratory tests on rock, concrete and cementitious particles, in order to monitor the destruction of a material, it is necessary to fix an acoustic emission sensor to the surface of a sample and to collect a signal emitted by the destruction inside the material. However, there is currently no simple and accurate acoustic emission sensor contact device. At present, the fixing mode of the acoustic emission sensor in the test mainly comprises mechanical fixing and bonding fixing. The mechanical fixation comprises tape winding and rubber band binding, because the acoustic emission sensor needs to be coupled with the sample by using a coupling agent, the coupling agent on the surface of the sample can reduce the adhesive force of the tape, the sensing surface of the acoustic emission sensor cannot be in good contact with the surface of the sample, and meanwhile, the tape or the rubber band wound on the surface of the sample can restrict the circumferential deformation of the sample, so that a hoop effect is generated, and the real test result is influenced; for the bonding and fixing mode, quick-drying strong glue is usually smeared on the surface of a fixing clamp and a sample, the clamp is fixed on the surface of the sample firstly, then a sensor is contacted with the surface of the sample through a screw, and due to the effect of the glue, the fixing clamp equivalently locally reinforces the sample, so that the test precision is influenced. When the rotary screw makes acoustic emission sensor and test surface contact, the sensor can be damaged to the screw is tighter, and the more loose sensor of screw easily drops, and especially to the cylinder sample, the influence of mounting fixture to the test result can be more obvious.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the acoustic emission sensor contact device provided by the invention can ensure that the acoustic emission sensor can be in good contact with the surface of a sample in the whole test process, realize the accurate positioning of a plurality of acoustic emission sensors, reduce the influence of the acoustic emission sensor contact on the test result, and improve the test efficiency and the accuracy and the authenticity of the test result.
A sound emission sensor contact device comprises a vertical support mechanism, a horizontal support mechanism and a sound emission sensor fixing mechanism, wherein the vertical support mechanism comprises a magnetic suction seat, a support rod, a first rotating nut, a positioning ring, a positioning sleeve and a first spring, and the support rod is fixed on the magnetic suction seat; the horizontal supporting mechanism comprises a telescopic rod, a second spring, a third spring and a second rotating nut, and one end of the telescopic rod is fixed on the supporting rod through a positioning ring; the acoustic emission sensor fixing mechanism comprises a clamping groove and a third rotating nut, the telescopic rod is connected to the clamping groove through a spherical joint, and the acoustic emission sensor is fixed to the clamping groove.
In some embodiments, the support rod is threaded on an outer surface thereof, and the first swivel nuts are respectively rotated at upper and lower ends of the support rod.
In some embodiments, the telescopic rod is divided into an outer rod and an inner rod, the outer rod is a hollow round rod, the surface of the outer rod is provided with threads, and the inner rod is connected to the inner end of the outer rod through a third spring.
The invention also aims to provide a using method of the acoustic emission sensor contact device, which comprises the following steps:
s1: fixing the support rod on the magnetic suction seat, and sequentially installing a first rotating nut, a positioning sleeve and a positioning ring on the outer side of the support rod from the end of the support rod;
s2: the telescopic rod is fixed on the support rod through the positioning ring;
s3: fixing the acoustic emission sensor inside the clamping groove;
s4: according to the design position of the acoustic emission sensor, the height of the telescopic rod is adjusted through the first rotating nut on the supporting rod, and the length of the telescopic rod is adjusted through the second rotating nut on the telescopic rod to compress the second spring, so that the acoustic emission sensor is in good contact with the surface of the sample.
In some embodiments, in step S4, the sensing surface of the acoustic emission sensor is selected according to the surface of the sample, and a curved surface sensor is used for a cylindrical sample and a flat surface sensor is used for a cubic sample.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of the present invention.
Fig. 2 is another schematic structure of the present invention.
Reference numerals: the device comprises a vertical supporting mechanism 1, a magnetic suction seat 11, a supporting rod 12, a first rotating nut 13, a positioning ring 14, a positioning sleeve 15 and a first spring 16; the horizontal supporting mechanism 2, the telescopic rod 21, the second spring 22, the third spring 23 and the second rotating nut 24; the acoustic emission sensor fixing mechanism 3, the clamping groove 31 and the third rotating nut 32; an acoustic emission sensor 4.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
An acoustic emission sensor contact device according to an embodiment of the present invention is described below with reference to fig. 1-2.
As shown in fig. 1-2, the acoustic emission sensor contact device according to the embodiment of the present invention includes a vertical support mechanism 1, a horizontal support mechanism 2, and an acoustic emission sensor fixing mechanism 3, where the vertical support mechanism 1 includes a magnetic suction seat 11, a support rod 12, a first rotating nut 13, a positioning ring 14, a positioning sleeve 15, and a first spring 16, and the support rod 12 is fixed to the magnetic suction seat 11; the horizontal supporting mechanism 2 comprises a telescopic rod 21, a second spring 22, a third spring 23 and a second rotating nut 24, wherein the telescopic rod 21 is fixed on the supporting rod 12 through a positioning ring 14; the acoustic emission sensor fixing mechanism 3 comprises a clamping groove 31 and a third rotating nut 32, the telescopic rod 21 is connected to the clamping groove 31 through a spherical joint, and the acoustic emission sensor 4 is fixed to the clamping groove 21.
It can be understood that, magnetic force suction seat 11 is easily fixed and dismantled through magnetic control, and can guarantee the overall stability at 4 contact means of acoustic emission sensor in the sample loading process, the bracing piece 12 surface is carved with the screw thread, realize the adjustment of holding ring 14 height through swivel support rod lower extreme swivel nut 13, the selection through 15 lengths of position sleeve realizes the location on the co-altitude of a plurality of acoustic emission sensors, reduce the space that 4 occupy of installation acoustic emission sensor simultaneously, be convenient for observe the sample destruction and adopt other equipment to carry out the simultaneous monitoring to the sample destruction process.
It can be understood that the telescopic rod 21 is divided into an outer rod and an inner rod, the surface of the outer rod is carved with threads for adjusting the length of the telescopic rod 21, and the working principle is as follows: by rotating the second swivel nut 24 on the surface of the outer rod, the second spring 22 between the inner and outer rods is compressed, so that the inner rod extends out, and the inner rod is balanced in stress under the action of the third spring 23. In addition, when the sample appears hoop/lateral displacement, especially the cemented granule sample that is formed by granule and cement binding material, telescopic link 21 passes through spring assembly and guarantees that whole test in-process, acoustic emission sensor 4 and sample contact are good, reduce monitoring error.
In addition, in the whole loading process of the sample, the spherical connection of the inner rod and the base of the clamping groove 21 and the telescopic rod 21 spring mechanism ensure that the acoustic emission sensor 4 is always in good contact with the surface of the sample, and meanwhile, the influence of sensitive spring pressure reduction on the circumferential deformation of the sample is avoided.
It will be appreciated that the telescopic rod 21 is secured to the support rod 12 by the retaining ring 14, which is easy to remove.
According to the use method of the acoustic emission sensor contact device, as shown in fig. 1, the acoustic emission sensor contact device comprises a vertical supporting mechanism 1, a horizontal supporting mechanism 2 and an acoustic emission sensor fixing mechanism 3, and the use method of the acoustic emission sensor contact device comprises the following steps:
s1: fixing a support rod 12 on a magnetic suction seat 11, and fixing a first rotating nut 13, a positioning ring 14 and a positioning sleeve 15 on the outer side of the support rod from the end of the support rod 12 in sequence;
s2: the telescopic rod 21 is fixed on the support rod 12 through the positioning ring 14;
s3: the acoustic emission sensor 4 is fixed inside the card slot 31;
s4: according to the design position of the acoustic emission sensor 4, the height of the telescopic rod 21 is adjusted through the first rotating nut 13 on the supporting rod 12, and the length of the telescopic rod is adjusted through the second rotating nut 24 on the telescopic rod 21 to compress the second spring 22, so that the acoustic emission sensor 4 is in good contact with the surface of the sample.
Reference is now made to the use of the acoustic emission sensor contact means of two specific embodiments of the present invention.
Example 1:
as shown in fig. 2, the acoustic emission sensor of the present embodiment contacts with the surface of the cubic sample, the acoustic emission sensor contacting device includes 2 vertical supporting mechanisms 1, 4 horizontal supporting mechanisms 2, and 4 acoustic emission sensor fixing mechanisms 3, the vertical supporting mechanism 1 includes a magnetic suction base 11, a supporting rod 12, a first rotating nut 13, a positioning 14, a positioning sleeve 15, and a first spring 16, the supporting rod 12 is fixed to the magnetic suction base 11; the horizontal supporting mechanism 2 comprises a telescopic rod 21, a second spring 22, a third spring 23 and a second rotating nut 24, wherein the telescopic rod 21 is fixed on the supporting rod 12 through a positioning ring 14; the acoustic emission sensor fixing mechanism 3 comprises a clamping groove 31 and a third rotating nut 32, the telescopic rod 21 is connected to the clamping groove 31 through a spherical joint, and the acoustic emission sensor 4 is fixed on the clamping groove 21
The specific application method is as follows:
s1: according to the test monitoring requirement, the left side and the right side of the sample are respectively monitored by adopting 2 acoustic emission sensors;
s2: assembling the vertical supporting mechanism 1, sequentially installing a first rotating nut 13, a positioning ring 14, a positioning sleeve 15 and a first spring 16 on the supporting rod 12, and then fixing the supporting rod 12 on the upper part of the magnetic suction seat 11;
s3: the telescopic rod 21 is fixed on the vertical supporting mechanism 1 through the positioning ring 14, and the acoustic emission sensor 4 is fixed on the clamping groove 31.
S4: smearing a couplant on a sample measuring point, putting a sample in an upper pressurizing plate and a lower pressurizing plate of a testing machine, putting a magnetic suction seat near the loading of the testing machine, starting magnetic force to fix the magnetic suction seat 11 on the loading machine, adjusting the height of an expansion link 21 through a first rotating nut 13, and adjusting the length of the expansion link 21 through a second rotating nut 24 to ensure that the acoustic emission sensor 4 is in good contact with the surface of the sample.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. A contact device of an acoustic emission sensor is characterized by comprising a vertical supporting mechanism (1), a horizontal supporting mechanism (2) and an acoustic emission sensor fixing mechanism (3);
the vertical supporting mechanism (1) comprises a magnetic suction seat (11), a supporting rod (12), a first rotating nut (13), a positioning ring (14), a positioning sleeve (15) and a first spring (16), wherein the supporting rod (12) is connected with the magnetic suction seat (11);
the horizontal supporting mechanism (2) comprises a telescopic rod (21), a second spring (22), a third spring (23) and a second rotating nut (24), and one end of the telescopic rod (21) is connected with the positioning ring (14);
the acoustic emission sensor fixing mechanism (3) comprises a clamping groove (31) and a third rotating nut (32), the clamping groove (31) is connected with the telescopic rod (21) through a spherical joint, and the acoustic emission sensor (4) is clamped with the clamping groove (21).
2. The acoustic emission sensor contact device of claim 1, wherein the support rod (12) is threaded on its outer surface and the first swivel nut (13) is swiveled at the upper and lower ends of the support rod (12), respectively.
3. The acoustic emission sensor contact device of claim 1, wherein the telescopic rod (21) is divided into an outer rod and an inner rod, the outer rod is a hollow round rod with a surface engraved with threads, and the inner rod is connected to the inner end of the outer rod through a third spring (23).
4. The method of using an acoustic emission sensor contact device according to any of claims 1 to 3, comprising the steps of:
s1: fixing a support rod (12) on a magnetic suction seat (11), and sequentially installing a first rotating nut (13), a positioning ring (14) and a positioning sleeve (15) on the support rod (12);
s2: the telescopic rod (21) is connected with the positioning ring (14);
s3: fixing the acoustic emission sensor (4) inside the clamping groove (31);
s4: according to the design position of the acoustic emission sensor of the sample, the height of the telescopic rod (21) is adjusted through the first rotating nut (13) on the supporting rod (12), the length of the telescopic rod (21) is adjusted through the second rotating nut (24) on the telescopic rod (21) to compress the second spring (22), and the acoustic emission sensor (4) is in good contact with the surface of the sample.
5. Use according to claim 4, characterized in that the sensing surface of the acoustic emission sensor (4) is selected according to the surface of the sample, with a curved surface sensor for cylindrical samples and a flat surface sensor for cubic samples.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011578388.5A CN112526001A (en) | 2020-12-28 | 2020-12-28 | Acoustic emission sensor contact device and method of use thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011578388.5A CN112526001A (en) | 2020-12-28 | 2020-12-28 | Acoustic emission sensor contact device and method of use thereof |
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| CN112526001A true CN112526001A (en) | 2021-03-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203622A (en) * | 2021-04-26 | 2021-08-03 | 温州大学 | Real-time measuring system for detecting radial displacement of geotechnical triaxial sample |
| CN114136762A (en) * | 2021-11-29 | 2022-03-04 | 燕山大学 | Fixed clamping device and system for extracting target image by using sound wave signal |
-
2020
- 2020-12-28 CN CN202011578388.5A patent/CN112526001A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203622A (en) * | 2021-04-26 | 2021-08-03 | 温州大学 | Real-time measuring system for detecting radial displacement of geotechnical triaxial sample |
| CN114136762A (en) * | 2021-11-29 | 2022-03-04 | 燕山大学 | Fixed clamping device and system for extracting target image by using sound wave signal |
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