Rock detection auxiliary device based on acoustic emission

Abstract

The utility model discloses a rock detection auxiliary device based on acoustic emission. The rock detection auxiliary device comprises an acoustic emission sensor and a fixing assembly for fixing the acoustic emission sensor on a test piece, the fixing assembly comprises a hoop, an abutting cylinder is fixedly arranged on the hoop, and one end of the abutting cylinder can abut against the surface of the test piece; the acoustic emission sensor is connected with the abutting cylinder; the acoustic emission sensor can abut against the surface of the test piece. According to the utility model, the acoustic emission sensor can be quickly mounted on the test piece, and the disassembly is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of rock acoustic emission monitoring, in particular to a rock detection auxiliary device based on acoustic emission. Background Art

[0002] Rock acoustic emission monitoring technology refers to a non-destructive detection technology that uses the acoustic wave signals caused by small displacements or stress changes inside or on the surface of the rock to monitor, warn and evaluate the rock. The acoustic emission sensor is the core component of the rock acoustic emission monitoring system, which is used to receive and transmit rock acoustic emission signals.

[0003] In the current acoustic emission test of rock specimens, the installation and fixation of acoustic emission sensors is an important link. The main fixing methods of acoustic emission sensors in the laboratory are adhesive bonding, magnetic adsorption fixation and mechanical fixation. Adhesive bonding is not only complicated to disassemble and assemble, but also the sensor is prone to slippage; magnetic adsorption fixation has great limitations and is not applicable in most cases; mechanical fixation mainly fixes the sensor to the specimen by tightening the clamp and tightening the bolts, which causes excessive wear on the sensor, and if it is tightened too loose, it will cause insufficient contact between the sensor and the specimen and easy to fall off.

[0004] Therefore, designing a rock detection auxiliary device that is convenient for fixing the acoustic emission sensor on the test piece and convenient for disassembly is one of the problems that urgently need to be solved by people in this field. Utility Model Content

[0005] The utility model aims to provide a rock detection auxiliary device based on acoustic emission to solve the deficiencies in the prior art. The utility model can realize rapid installation of an acoustic emission sensor on a test piece and is convenient for disassembly.

[0006] The utility model provides a rock detection auxiliary device based on acoustic emission, comprising an acoustic emission sensor and a fixing component for fixing the acoustic emission sensor to a test piece;

[0007] The fixing assembly comprises a clamp, on which an abutment tube is fixedly provided, one end of which can abut against the surface of the specimen; the acoustic emission sensor is connected to the abutment tube; and the acoustic emission sensor can abut against the surface of the specimen.

[0008] As described above, a rock detection auxiliary device based on acoustic emission, wherein, preferably, the acoustic emission sensor is slidably installed in the abutment tube; an elastic member is installed in the abutment tube, one end of the elastic member abuts against the acoustic emission sensor so that one end of the acoustic emission sensor extends out of the abutment tube, and the other end of the elastic member abuts against the inner wall of the abutment tube.

[0009] A rock detection auxiliary device based on acoustic emission as described above, wherein, preferably, a pull rod is installed in the abutment tube, one end of the pull rod is connected to the acoustic emission sensor, and the other end extends out of the abutment tube, and the pull rod is arranged along the axial direction of the abutment tube and is slidably connected to the abutment tube; the elastic member is sleeved on the pull rod, and the pull rod is provided with a limiting member for limiting the pull rod.

[0010] A rock detection auxiliary device based on acoustic emission as described above, wherein, preferably, the limit member is a limit block, the limit block is fixedly mounted on the pull rod, and an avoidance groove is opened on the abutment tube along its center line direction; the limit block has two states, in a first state, the limit block is located in the avoidance groove, and one end of the acoustic emission sensor extends out of the abutment tube; in a second state, the limit block is located outside the abutment tube and abuts on the end face of the abutment tube away from the test piece, and the acoustic emission sensor is located in the abutment tube.

[0011] In the above-mentioned rock detection auxiliary device based on acoustic emission, preferably, a handle is provided at one end of the pull rod away from the acoustic emission sensor.

[0012] In the acoustic emission-based rock detection auxiliary device as described above, preferably, a positioning groove is provided on the inner wall of the abutment tube along the direction of the center line of the abutment tube, and a sliding block adapted to the positioning groove is provided on the acoustic emission sensor.

[0013] As described above, in the acoustic emission-based rock detection auxiliary device, preferably, a connecting plate is fixedly mounted on one end of the acoustic emission sensor close to the pull rod, and the slider is fixedly arranged on the connecting plate; the pull rod is connected to the connecting plate.

[0014] In the above-mentioned rock detection auxiliary device based on acoustic emission, preferably, a rubber pad is provided at one end of the abutment tube close to the test piece.

[0015] In the above-mentioned rock detection auxiliary device based on acoustic emission, preferably, there are multiple abutment tubes, and the multiple abutment tubes are evenly distributed along the circumferential direction of the clamp.

[0016] In the above-mentioned rock detection auxiliary device based on acoustic emission, preferably, a lifting lug is provided on the clamp, a lifting rope is connected to the lifting lug, and the lifting rope is used to be connected to a pressurizing device that applies pressure to the test piece.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The utility model can conveniently and quickly fix the acoustic emission sensor connected to the abutment tube to the test piece through the arrangement of the clamp and the abutment tube, and is easy to disassemble.

[0019] 2. The utility model sets the acoustic emission sensor in the abutment tube by sliding, and sets an elastic member in the abutment tube which enables one end of the acoustic emission sensor to extend out of the abutment tube. When the abutment tube abuts on the test piece, it can ensure that the acoustic emission sensor can also abut on the test piece. When the test piece expands and deforms due to the pressure of the pressurizing device, the elastic member can adjust the extrusion force on the acoustic emission sensor, reduce the wear of the acoustic emission sensor, and avoid damage to the acoustic emission sensor due to excessive pressure.

[0020] 3. The utility model provides a pull rod, a limit piece on the pull rod, and an avoidance groove on the abutment tube. Before the acoustic emission sensor is fixed to the test piece during use, the acoustic emission sensor can be completely received into the abutment tube, and the limit piece is abutted on the end face of the abutment tube for limiting. After the abutment tube is fixed on the test piece, the limit piece is aligned with the avoidance groove. Under the elastic force of the elastic piece, the acoustic emission sensor moves toward the test piece and abuts on the test piece, avoiding the friction between the acoustic emission sensor and the surface of the test piece due to the acoustic emission sensor contacting the test piece first during the fixing of the clamp, resulting in wear of the acoustic emission sensor.

[0021] 4. The utility model can store the acoustic emission sensor into the abutment tube when the detection device is not in use, thereby protecting the acoustic emission sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a rock detection auxiliary device based on acoustic emission proposed by the utility model;

[0023] Figure 2 It is a schematic diagram of the installation structure of the abutment tube, the acoustic emission sensor, the pull rod, the rubber pad, and the elastic member;

[0024] Figure 3 yes Figure 2 Schematic diagram of the structure from another perspective;

[0025] Figure 4 yes Figure 2 A cross-sectional view of

[0026] Figure 5 It is a schematic diagram of the structure of the abutment cylinder.

[0027] Description of reference numerals:

[0028] 1-acoustic emission sensor, 2-clamp, 3-abutment tube, 4-elastic member, 5-pull rod, 6-limiting member, 31-avoidance groove, 7-handle, 32-positioning slide groove, 8-rubber pad, 9-lifting ear, 10-connecting plate, 11-output line. DETAILED DESCRIPTION

[0029] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] Embodiment 1 of the present utility model:

[0031] like Figure 1-Figure 4 As shown, the utility model proposes a rock detection auxiliary device based on acoustic emission, including an acoustic emission sensor 1 and a fixing assembly for fixing the acoustic emission sensor 1 to a test piece; the fixing assembly includes a clamp 2, and the two ends of the clamp 2 are connected by bolts. In order to facilitate manual tightening, the nut of the bolt can be designed as a butterfly nut. Three abutment tubes 3 are fixedly provided on the clamp 2, and the three abutment tubes 3 are evenly distributed along the circumferential direction of the clamp 2. In specific implementation, multiple abutment tubes 3 can be set according to the needs of detection. One end of the abutment tube 3 can abut the surface of the test piece. As an implementation method, the abutment tube 3 is fixedly connected to the clamp 2 by welding. As an implementation method, a mounting through hole is opened on the clamp 2, and the center line of the mounting through hole passes through the center of the clamp 2. The abutment tube 3 is installed in the mounting through hole and fixed on the clamp 2 by welding. The acoustic emission sensor 1 is connected to the abutment tube 3; the acoustic emission sensor 1 can abut the surface of the test piece.

[0032] As an implementation method, the acoustic emission sensor 1 is slidably installed in the abutment tube 3, the opening of the abutment tube 3 faces the center of the clamp 2, and the detection end of the acoustic emission sensor 1 also faces the center of the clamp 2, ensuring that when the clamp 2 fixes the abutment tube 3 on the test piece, the detection end of the acoustic emission sensor 1 can abut on the test piece. A through hole is opened on the side wall of the abutment tube 3, and the output line 11 of the acoustic emission sensor 1 passes through the through hole and is connected to the display device (not shown in the figure); an elastic member 4 is installed in the abutment tube 3. As an implementation method, the elastic member 4 is a coil spring. One end of the elastic member 4 abuts on the acoustic emission sensor 1 so that one end of the acoustic emission sensor 1 extends out of the abutment tube 3, and the other end of the elastic member 4 abuts on the inner wall of the abutment tube 3. By providing the elastic member 4, a certain elastic force can be provided to the acoustic emission sensor 1, so that the detection head of the acoustic emission sensor 1 can be pressed against the test piece to detect the test piece. At the same time, when the test piece is expanded and deformed by the pressure of the pressurizing device, the elastic member 4 can adjust the squeezing force on the acoustic emission sensor to avoid damage to the acoustic emission sensor 1 due to excessive pressure.

[0033] Embodiment 2 of the present utility model:

[0034] This embodiment is further improved on the basis of the first embodiment, and the same parts as the first embodiment are not repeated, and only the improved parts are described.

[0035] See also Figure 3-Figure 5 A pull rod 5 is installed in the abutment tube 3, and one end of the pull rod 5 is connected to the acoustic emission sensor 1. The connection method can be fixed connection or rotation connection. When fixed connection, it can be fixed by welding, strong adhesive, screws and bolts. When rotating connection, bearings can be used for connection. Specifically, the outer ring of the bearing can be fixedly connected to the acoustic emission sensor 1 first, and then one end of the pull rod 5 is inserted into the inner ring of the bearing and fixedly connected with the inner ring. The other end of the pull rod 5 extends out of the abutment tube 3. The pull rod 5 is arranged along the axial direction of the abutment tube 3 and is slidably connected to the abutment tube 3. Extending one end of the pull rod 5 out of the abutment tube 3 facilitates manual pulling of the pull rod 5 to drive the acoustic emission sensor 1 to be completely collected into the abutment tube 3; the elastic member 4 is sleeved on the pull rod 5, one end of the elastic member 4 is fixedly connected to one end of the acoustic emission sensor 1, and the other end of the elastic member 4 abuts against the inner wall of the abutment tube 3. The pull rod 5 is provided with a limiter 6 for limiting the pull rod 5. The limiting member 6 is a limiting block, which is fixedly mounted on the pull rod 5. An avoidance groove 31 is provided on the abutment tube 3 along its center line direction. The limiting block has two states. In the first state, the limiting block is located in the avoidance groove 31, and one end of the acoustic emission sensor 1 extends out of the abutment tube 3. In the second state, the limiting block is located outside the abutment tube 3 and abuts against the end face of the abutment tube 3 away from the test piece, and the acoustic emission sensor 1 is located in the abutment tube 3.

[0036] As an implementation method for fixing the acoustic emission sensor 1 to the test piece, the limit block can be first placed in the second state. Specifically, the limit block is first placed in the first state. At this time, the detection end of the acoustic emission sensor 1 is located outside the abutment tube 3. A coupling agent (such as vaseline) is applied to the detection end. Then, by pulling the pull rod 5, when the limit block on the pull rod 5 is moved out of the avoidance groove 31, the pull rod 5 is rotated to make the limit block deviate from the avoidance groove 31. After the pull rod 5 is released, under the action of the elastic force of the elastic member 4, the limit block is pressed against the end face of the abutment tube 3 away from the test piece, and the acoustic emission sensor 1 is completely received in the abutment tube 3, that is, the limit block is in the second state. Then, the clamp 2 is fixed to the test piece by the bolts on the clamp 2, so that the open end of the abutment tube 3 is pressed against the test piece. Since the clamp 2 does not contact the test piece and only the abutment tube 3 contacts the test piece, the contact area with the test piece can be reduced, thereby reducing the impact on the test result of the test piece. Finally, the pull rod 5 is rotated so that the limit block on the pull rod 5 is opposite to the avoidance groove 31. The pull rod 5 is released. Under the elastic force of the elastic member 4, the limit block is retracted into the avoidance groove 31, and the detection end of the acoustic emission sensor 1 moves toward the direction of the test piece and abuts against the test piece, completing the installation and fixation of the acoustic emission sensor 1 on the test piece. In this way, it is possible to avoid the acoustic emission sensor 1 from being worn due to friction between the acoustic emission sensor 1 and the test piece surface due to the first contact between the acoustic emission sensor 1 and the test piece during the fixing of the clamp 2.

[0037] In order to facilitate pulling the pull rod 5 , a handle 7 may be fixedly installed at one end of the pull rod 5 away from the acoustic emission sensor 1 .

[0038] In order to make the acoustic emission sensor 1 move more smoothly in the abutment tube 3 , a positioning groove 32 may be opened on the inner wall of the abutment tube 3 along the center line of the abutment tube 3 , and a sliding block adapted to the positioning groove 32 may be provided on the acoustic emission sensor 1 .

[0039] Further, a connecting plate 10 may be fixedly installed at one end of the acoustic emission sensor 1 close to the pull rod 5, and the slider is fixedly arranged on the connecting plate 10; the pull rod 5 is connected to the connecting plate 10. As an implementation method, the inner tube of the abutting tube 3 may be divided into a first hole section and a second hole section, the first hole section is located at the open end of the abutting tube 3, that is, the end close to the test piece, the diameter of the first hole section is slightly larger than the diameter of the detection end of the acoustic emission sensor 1, and the length of the first hole section is smaller than the length of the detection end, the diameter of the second hole section is larger than the maximum diameter of the acoustic emission sensor 1, the end of the acoustic emission sensor 1 close to the pull rod 5 is fixedly installed with a connecting plate 10, the shape of the connecting plate 10 is adapted to the second hole section, and can slide along the second hole section, the slider is fixed on the connecting plate 10, the pull rod 5 is rotatably connected to the connecting plate 10, and a bearing connection may be used.

[0040] In order to reduce the damage to the test piece when the abutting tube 3 contacts the test piece, a rubber pad 8 may be provided at one end of the abutting tube 3 close to the test piece, and the rubber pad 8 may be fixedly connected to the abutting tube 3 by gluing.

[0041] Furthermore, in order to prevent the acoustic emission sensor 1 from falling off and being damaged from the specimen due to excessive pressure applied by the pressure device during the test, which may cause the specimen to rupture or break, a lifting ear 9 may be provided on the clamp 2, and a lifting rope (not shown) may be connected to the lifting ear 9, and the lifting rope is used to be connected to the pressure device that applies pressure to the specimen.

[0042] The utility model can also store the acoustic emission sensor 1 in the abutment tube when the detection device is not in use, so that the acoustic emission sensor 1 is protected even if the limit block is in the second state.

[0043] The above describes in detail the structure, features and effects of the utility model based on the embodiments shown in the drawings. The above is only a preferred embodiment of the utility model, but the utility model is not limited to the scope of implementation shown in the drawings. Any changes made in accordance with the concept of the utility model, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the description and the drawings, should be within the protection scope of the utility model.

Claims

1. A rock detection auxiliary device based on acoustic emission, characterized in that: It comprises an acoustic emission sensor (1) and a fixing assembly for fixing the acoustic emission sensor (1) to a test piece; The fixing assembly comprises a clamp (2), an abutment tube (3) being fixedly provided on the clamp (2), one end of the abutment tube (3) being capable of abutting against the surface of the specimen; the acoustic emission sensor (1) is connected to the abutment tube (3); and the acoustic emission sensor (1) is capable of abutting against the surface of the specimen.

2. The rock detection auxiliary device based on acoustic emission according to claim 1 is characterized in that: The acoustic emission sensor (1) is slidably mounted in the abutment tube (3); an elastic member (4) is mounted in the abutment tube (3); one end of the elastic member (4) abuts against the acoustic emission sensor (1) so that one end of the acoustic emission sensor (1) extends out of the abutment tube (3); and the other end of the elastic member (4) abuts against the inner wall of the abutment tube (3).

3. The rock detection auxiliary device based on acoustic emission according to claim 2 is characterized in that: A pull rod (5) is installed in the abutment tube (3), one end of the pull rod (5) is connected to the acoustic emission sensor (1), and the other end extends out of the abutment tube (3), the pull rod (5) is arranged along the axial direction of the abutment tube (3), and is slidably connected to the abutment tube (3); the elastic member (4) is sleeved on the pull rod (5), and the pull rod (5) is provided with a limiting member (6) for limiting the pull rod (5).

4. The rock detection auxiliary device based on acoustic emission according to claim 3 is characterized in that: The limiting member (6) is a limiting block, which is fixedly mounted on the pull rod (5). The abutment tube (3) is provided with an avoidance groove (31) along the center line direction thereof. The limiting block has two states. In a first state, the limiting block is located in the avoidance groove (31), and one end of the acoustic emission sensor (1) extends out of the abutment tube (3). In a second state, the limiting block is located outside the abutment tube (3) and abuts against the end surface of the abutment tube (3) away from the test piece, and the acoustic emission sensor (1) is located in the abutment tube (3).

5. The rock detection auxiliary device based on acoustic emission according to claim 4 is characterized in that: A handle (7) is provided at one end of the pull rod (5) away from the acoustic emission sensor (1).

6. The rock detection auxiliary device based on acoustic emission according to claim 3 is characterized in that: A positioning slide groove (32) is provided on the inner wall of the abutment tube (3) along the direction of the center line of the abutment tube (3), and a sliding block matched with the positioning slide groove (32) is provided on the acoustic emission sensor (1).

7. The rock detection auxiliary device based on acoustic emission according to claim 6 is characterized in that: A connecting plate (10) is fixedly mounted on one end of the acoustic emission sensor (1) close to the pull rod (5), and the sliding block is fixedly arranged on the connecting plate (10); the pull rod (5) is connected to the connecting plate (10).

8. The rock detection auxiliary device based on acoustic emission according to claim 1 is characterized in that: A rubber pad (8) is provided at one end of the abutment tube (3) close to the test piece.

9. The rock detection auxiliary device based on acoustic emission according to claim 1, characterized in that: There are a plurality of abutment tubes (3), and the plurality of abutment tubes (3) are evenly distributed along the circumferential direction of the clamp (2).

10. The rock detection auxiliary device based on acoustic emission according to claim 1, characterized in that: The clamp (2) is provided with a lifting ear (9), and the lifting ear (9) is connected with a lifting rope, and the lifting rope is used to be connected to a pressurizing device that applies pressure to the test piece.

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