CN210269728U - A multisensor fixing device for coal petrography acoustic emission experiment test - Google Patents
A multisensor fixing device for coal petrography acoustic emission experiment test Download PDFInfo
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- CN210269728U CN210269728U CN201920252540.7U CN201920252540U CN210269728U CN 210269728 U CN210269728 U CN 210269728U CN 201920252540 U CN201920252540 U CN 201920252540U CN 210269728 U CN210269728 U CN 210269728U
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Abstract
The utility model discloses a multi-sensor fixing device for coal rock acoustic emission experimental test, which is characterized in that the fixing device comprises a fixing frame which can be adjusted randomly along with the dimension of a sample to be tested, a plurality of sensor holders, a plurality of positioners and a plurality of positioning bolts; the fixed frame can meet the test requirements of experimental samples with different sizes; the side surfaces of the fixed frame are arranged according to requirements, so that the requirement of arranging multiple sensors under a complex test working condition can be met; the horizontal frame can move to a preset height and is fixed; the positioner moves to a preset position along the horizontal frame to be fixed; the sensor holder is mainly used for fixing and restraining the movement of the sensor and adaptively adjusting and maintaining the coupling state of the sensor and a sample to be detected; the sensor holder is connected with the fixed frame through a positioner and a positioning bolt. The utility model discloses multisensor fixing device of coal petrography acoustic emission experiment test simple structure, equipment convenience, fixed firm, interference killing feature are strong, can realize installing the complicated test requirement of a plurality of sensors at experimental sample surface optional position to have the advantage that improves experiment efficiency of software testing and experimental result precision.
Description
Technical Field
The utility model relates to a coal petrography physics mechanics experiment test field specifically relates to a sample and sensor fixing device of coal petrography bulk acoustic emission experiment specially.
Background
Coal rock or metal materials are deformed and damaged under the action of external load, so that local energy in the materials is accumulated and is rapidly released to emit transient elastic waves, and the phenomenon is called Acoustic Emission (Acoustic Emission). In recent years, as an emerging nondestructive testing technique, acoustic emission technology has been widely used in the research of mechanical properties of materials such as concrete, rock, and metal. The acoustic emission technology has the advantages of strong continuity, small environmental dependence, strong anti-interference capability, real-time monitoring and the like. The acoustic emission signal has large characteristic parameter information amount, can record and react the whole process of the initiation, expansion, penetration and instability destruction of microcracks in the material, and provides theoretical and technical basis for material characteristic analysis and disaster prevention and control.
In the acoustic emission experiment process, the installation quality of the test sensor directly relates to the accuracy of the test result. Different from the conventional ferromagnetic metal experimental test, the acoustic emission experimental test of the coal rock material and part of the diamagnetic metal material has the operation problem that the sensor is inconvenient to fix. At present, the sensor and a sample to be detected are fixed in a conventional coal rock acoustic emission experiment by means of tape adhesion, elastic tape winding, quick glue bonding and the like. There are many disadvantages to the above-described fastening means: (1) the sensor is easily irreparably damaged by directly adopting quick bonding glue to mount the sensor; (2) the sensor is fixed by an adhesive tape or an elastic tape, the sensor is easy to dislocate, the installation process is time-consuming and labor-consuming, and only a small number of sensors can be installed; (3) flexible materials such as tapes, elastic bands, etc. can also deform during loading to cause noise interference. Although the above phenomena have attracted much attention, an effective sensor fixing device is still lacked, and particularly for complex test conditions of multiple sensors at any position, the arrangement and the fixing of the sensors still need new solutions.
In summary, it is necessary to provide a multi-sensor arrangement and fixation device for a coal rock acoustic emission experiment test to meet the technical requirements of the acoustic emission experiment test under complex working conditions.
Disclosure of Invention
The utility model provides a multisensor fixing device of coal petrography acoustic emission experiment test of simple structure, easily operation to solve coal petrography material or diamagnetic metallic material acoustic emission experiment sensor and install the technical problem of difficulty.
In order to solve the technical problem, the utility model designs a following multisensor fixing device mainly includes: the device comprises a fixed frame, a plurality of sensor holders, a plurality of positioners and a plurality of positioning bolts, wherein the fixed frame can be adjusted randomly along with the size of a sample to be measured; the frame consists of a vertical frame containing an I-shaped sliding rail, a horizontal frame containing a limiting hole and a plurality of structural bolts, and the fixed frame can meet the test requirements of experimental samples with different sizes; horizontal frames are arranged on the side faces of the frames as required and are fixed through structural bolts; the sensor holders are arranged according to the layout requirement and are fixed with the horizontal frame through the positioners and the positioning bolts; the sensor holder comprises a concave circular groove, a sensor is placed in the sensor holder, a sensor wiring terminal can be led out from the side face, a magnetic component is arranged at the connecting part of the end face of the sensor holder and the positioner, and the sensor holder is fixed through magnetic force.
The sensor holder mainly comprises a spring, a magnetic member and a concave circular groove, and the magnetic member and the concave circular groove are mainly used for fixing and restraining the movement of the sensor.
The concave circular groove of the sensor holder is used for placing a sensor, and the radius of the concave circular groove is the same as that of the sensor; the length of the slotted part is smaller than the thickness of the sensor, and the spring is in a compressed state after the sensor is installed, so that the sensor is ensured to be fully contacted with the coal rock sample all the time; when the sample is deformed by an external force, the spring is adjusted in a self-adaptive manner, so that the good coupling state of the sensor and the sample to be detected is maintained, meanwhile, the sensor is protected, and the service life of the sensor is prolonged.
The sensor holder is connected with the fixed frame through a positioning bolt and a positioner.
The utility model provides a multisensor fixing device of coal petrography acoustic emission experiment test has following advantage: the fixing device has good adaptability, and can meet the requirements of samples with different scales and complex test working conditions for arranging a plurality of sensors; the fixing device has a reasonable structure, can ensure that the sensor is fully contacted with a sample in the whole test process, and meanwhile protects the sensor, so that the service life of the sensor can be prolonged; the fixing device is simple in structure, convenient to assemble, firm in fixing and strong in anti-interference capacity, and can effectively improve the experiment testing efficiency and improve the precision of an experiment result.
Drawings
FIG. 1 is a schematic structural diagram of a multi-sensor fixing device for a coal rock acoustic emission experiment test (single-row sensor);
FIG. 2 is a top view of the multi-sensor fixing device for the coal rock acoustic emission experimental test (single-row sensor);
fig. 3 is a schematic structural diagram of the multi-sensor fixing device for the coal rock acoustic emission experimental test (double-row sensor);
FIG. 4 is a schematic view of a sensor holder configuration;
FIG. 5 is a left side cross-sectional view of the sensor holder;
in the figure: the sensor comprises a horizontal frame 1, a limiting hole 2, a sensor holder 3, an I-shaped sliding rail 4, a vertical frame 5, a positioner 6, a structural bolt 7, a positioning bolt 8, a sensor 9, a spring 10, a concave circular groove 11, a sensor wiring terminal 12 and a magnetic component 13.
Detailed Description
As shown in the figure, the utility model discloses multisensor fixing device based on coal petrography acoustic emission tests mainly includes: the device comprises a fixed frame which can be adjusted randomly along with the size of a sample to be measured, a plurality of sensor clampers 3, a plurality of positioners 6 and a plurality of positioning bolts 8; the frame consists of a vertical frame 5 containing an I-shaped sliding rail 4, a horizontal frame 1 containing a limiting hole 2 and a plurality of structural bolts 7, and the fixed frame can meet the test requirements of experimental samples with different sizes by adjusting the joint position of the vertical frame 5 and the horizontal frame 1 containing the limiting hole 2; the side face of the fixed frame is provided with a horizontal frame 1 as required, and the horizontal frame 1 is fixed through a structural bolt 7 after moving to a preset height along an I-shaped sliding rail 4; the horizontal frame 1 is provided with a plurality of clampers 3 (namely a plurality of sensors 9) according to the experimental requirement; the sensor holder 3 comprises a concave circular groove 11 for placing the sensor 9, and a sensor connecting terminal 12 is led out from the side.
The probe of the sensor 9 connected with the acoustic emission device is coated with proper couplant, such as glycerin, vaseline and the like, the sensor 9 is placed in the concave circular groove 11 of the holder 3, the positioner 6 is moved to a preset position, and then the sensor holder 3 is fixed on the horizontal frame 1 with the limiting hole 2 through the positioner 6.
The utility model discloses the use of the multisensor fixing device of coal petrography acoustic emission experiment test is described in detail below through combining specific embodiment to the location experiment of four conventional sensors is taken as the example, and the operation process is as follows:
(1) according to the size of a sample to be detected, the relative positions of the horizontal frame 1 and the vertical frame 5 are adjusted through the limiting hole 2 and the I-shaped sliding rail 4, so that the size of the fixed frame is adapted to the size of the sample;
(2) putting a sample into the center of an assembled fixed frame suitable for the size of the sample, arranging a required number of horizontal frames 1 (4 in a single-row diagram) on the side surface of the frame, moving to a preset position, fixing the horizontal frames by structural bolts 7, arranging a corresponding number of positioners 6 (4 in a single-row diagram) on the horizontal frames 1 according to the requirement, moving and fixing the horizontal frames by positioning bolts 8 at the preset position;
(3) installing the sensor 9 into the concave circular groove 11 of the sensor holder 3, and coating coupling agents such as vaseline, glycerol and the like on a probe of the sensor 9 in order to improve the coupling effect;
(4) sliding the sensor 9 together with the clamp 3 into the positioner 6 from the side, fixing the sensor 9 to the horizontal frame 2 through the positioning bolt 8, wherein the spring 10 is in a compressed state when the sensor 9 is in contact with a sample, and adaptively keeping a good coupling state of the sensor and the wall surface of the sample;
(5) repeating the steps (3) and (4) until all the 4 sensors are installed;
(6) and putting the sample to be tested and the fixing device into a loading device for experimental testing, synchronously acquiring acoustic emission signals while loading, and analyzing related data after the experimental testing is finished.
For the conventional acoustic emission positioning experiment, under the premise of known wave velocity, not less than 4 acoustic emission sensors need to be installed, the fixing device of the utility model is utilized in the embodiment, 4 acoustic emission sensors are arranged in a single-row structural form; for the experimental test of acoustic emission moment tensor analysis, usually, at least 8 acoustic emission sensors in a double-row structural form need to be arranged, the operation process is the same as that of the embodiment, and only the sensors in corresponding number need to be additionally installed.
Claims (3)
1. The utility model provides a multisensor fixing device for coal petrography acoustic emission tests, its characterized in that, fixing device mainly includes: the device comprises a fixed frame, a plurality of sensor holders, a plurality of positioners and a plurality of positioning bolts, wherein the fixed frame can be adjusted randomly along with the size of a sample to be measured; the fixed frame consists of a vertical frame containing an I-shaped slide rail, a horizontal frame containing a limiting hole and a plurality of structural bolts; a horizontal frame, a sensor holder, a positioner and a positioning bolt are arranged on the side surface of the fixed frame as required; the horizontal frame moves to a preset height along the I-shaped sliding rail and is fixed through a structural bolt; the horizontal frame can be connected with a plurality of positioners, and the positioners are moved to preset positions and fixed through positioning bolts.
2. The multi-sensor fixing device for the coal rock acoustic emission experimental test as claimed in claim 1, wherein the sensor holder mainly comprises a spring, a magnetic member and a concave circular groove, the magnetic member and the concave circular groove are used for fixing and restraining the movement of the sensor, and the sensor holder is connected with the fixing frame through a positioning bolt and a positioner; the concave circular groove is positioned on the side surface of the sensor holder and used for placing a sensor, and the side surface is opened to lead out a sensor signal wire; a spring is arranged in the concave circular groove, the radius of the concave circular groove is the same as that of the sensor, and the length of the slotting part is smaller than the thickness of the sensor; the magnetic component is arranged at the joint part of the end surface of the sensor holder and the positioner and fixes the sensor holder through magnetic force; the spring is in a compressed state after the sensor is installed so as to ensure that the sensor is always in contact with a test sample, and when the sample is subjected to an external force, the spring is self-adaptively adjusted to maintain a good coupling state between the sensor and the sample.
3. The multi-sensor fixing device for the coal rock acoustic emission experimental test as claimed in claim 1, wherein the fixing frame changes the size of the fixing frame by adjusting the relative position of the vertical frame and the horizontal frame with the limiting hole, so as to adapt to the application requirements of different sample sizes; the fixed frame realizes the complex experiment working condition requirement of installing a plurality of sensors at any positions by changing the installation quantity of the horizontal frames, adjusting the relative positions of the horizontal frames on the I-shaped slide rail, and arranging and moving different numbers of holders and sensors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920252540.7U CN210269728U (en) | 2019-02-28 | 2019-02-28 | A multisensor fixing device for coal petrography acoustic emission experiment test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920252540.7U CN210269728U (en) | 2019-02-28 | 2019-02-28 | A multisensor fixing device for coal petrography acoustic emission experiment test |
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| CN210269728U true CN210269728U (en) | 2020-04-07 |
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| CN201920252540.7U Expired - Fee Related CN210269728U (en) | 2019-02-28 | 2019-02-28 | A multisensor fixing device for coal petrography acoustic emission experiment test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858486A (en) * | 2021-03-12 | 2021-05-28 | 中国计量大学 | Laminated fixing device for acoustic emission sensor and using method |
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2019
- 2019-02-28 CN CN201920252540.7U patent/CN210269728U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858486A (en) * | 2021-03-12 | 2021-05-28 | 中国计量大学 | Laminated fixing device for acoustic emission sensor and using method |
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