Layered fixing device and method for acoustic emission probe of uniaxial compression coal rock combination

Abstract

The invention discloses a layered fixing device and method for acoustic emission probes of a uniaxial compression coal rock combination. The uniaxial compression test device comprises a supporting part, the annular support is horizontally arranged on the supporting part, the height position of the annular support on the supporting part can be adjusted, a coal-rock combination sample is placed in the annular support, and the coal-rock combination sample and the annular support are coaxially arranged; the fixing part is arranged on the annular support, the containing cavity of the fixing part is used for containing the acoustic emission probe, one end of the acoustic emission probe extends out of the containing cavity and abuts against the side wall of the coal rock combination sample, and the other end of the acoustic emission probe is connected with the inner bottom of the containing cavity through an elastic piece. Based on the layered fixing device and method for the acoustic emission probe of the uniaxial compression coal and rock combination, repeated disassembly and assembly of the acoustic emission probe in the acoustic emission test process can be reduced, the service life of the probe is further prolonged, meanwhile, probe falling caused by deformation and fracture of the coal and rock mass is avoided, and accurate collection and positioning of acoustic emission signals are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of uniaxial compression testing, and in particular to a device and method for fixing a layered acoustic emission probe of a uniaxially compressed coal-rock assembly. Background Art

[0002] When conducting uniaxial compression coal-rock combination acoustic emission positioning tests indoors, it is emphasized that the acoustic emission probe must be in close contact with the surface of the combination sample, so as to collect more accurate acoustic emission signals during the deformation and failure process of the sample.

[0003] When conducting an acoustic emission test on a coal-rock combination, the conventional method for fixing the acoustic emission sensor probe is to first apply a coupling agent, vaseline, on the probe surface, and then fix the probe with an elastic bandage and glue. However, as the axial stress of the acoustic emission probe increases, the elastic bandage will break as the coal-rock body peels off, causing the acoustic emission probe to fall off, making it impossible to collect the acoustic emission signal of the remaining loading process, resulting in inaccurate coordinate collection of the acoustic emission spatial positioning point.

[0004] Therefore, it is urgent to design a technical solution that will not cause the risk of the acoustic emission probe falling off during the test. Summary of the invention

[0005] The purpose of the present invention is to provide a layered fixing device and method for an acoustic emission probe of a uniaxially compressed coal-rock assembly to solve the problems existing in the above-mentioned prior art. During the acoustic emission test of the uniaxially compressed coal-rock assembly, the acoustic emission probe will not fall off.

[0006] To achieve the above object, the present invention provides the following solutions: The present invention provides a uniaxial compression coal-rock assembly acoustic emission probe layer fixing device, comprising: A support portion, wherein a horizontally arranged annular bracket is provided on the support portion, and the height position of the annular bracket on the support portion can be adjusted, the annular bracket is used to place a coal-rock combination sample, and the coal-rock combination sample is coaxially arranged with the annular bracket; The fixing part is arranged on the annular bracket, and includes a horizontally arranged accommodating cavity, in which the acoustic emission probe is placed. One end of the acoustic emission probe extends from the accommodating cavity and abuts against the side wall of the coal-rock combination sample, and the other end is connected to the bottom of the accommodating cavity through an elastic member.

[0007] Preferably, the fixing portion includes an outer shell and a spring bottom cover, wherein the spring bottom cover is open at one end and closed at the other end, and an axial through hole is provided on the side wall of the spring bottom cover, and the cross-section of the axial through hole matches the cross-section of the outer shell; one end of the outer shell is inserted into the axial through hole from the open end of the spring bottom cover, and the outer shell and the spring bottom cover can be fixed; the interior of the outer shell and the interior of the spring bottom cover are connected to form the accommodating cavity; the side wall of the outer shell is provided with a lead groove, and the lead groove is used to pass the acoustic emission sensor connecting line of the acoustic emission probe.

[0008] Preferably, a pad is provided in the accommodating cavity, the acoustic emission probe is located in the outer shell, and the end thereof away from the coal-rock combination sample is fixedly connected to the pad, one end of the elastic member is connected to the end of the pad away from the acoustic emission probe, and the other end is connected to the inner bottom of the spring bottom cover.

[0009] Preferably, a plurality of shell holes are sequentially opened on the shell side wall along the axial direction, and a spring bottom cover hole is opened on the spring bottom cover side wall. The spring bottom cover hole can be aligned with one of the shell holes and fixed with screws.

[0010] Preferably, a rubber ring is fixedly provided at one end of the housing away from the spring bottom cover, the inner diameter of the rubber ring is smaller than the outer diameter of the acoustic emission probe, and the end of the acoustic emission probe away from the spring bottom cover is inserted into the rubber ring.

[0011] Preferably, the annular bracket is provided with an annular bracket track; an annular flange is fixedly provided on the outer wall of the shell away from the spring bottom cover, and the annular flange side wall located on the upper part of the shell is provided with a slide groove with a bottom opening, and the slide groove is slidably set on the annular bracket track, and three annular bracket holes are provided on the annular bracket, which correspond to three fixed pillars respectively, and a moving space is formed between two adjacent annular bracket holes. After the slide groove is slidably set on the annular bracket track, the shell is located in the moving space and can slide circumferentially along the annular bracket track following the slide groove. The shell slides circumferentially in the moving space between two adjacent annular bracket holes, and the sliding range is 120°.

[0012] Preferably, the supporting portion includes a circular base, on which three vertically arranged fixed pillars are fixedly provided, and the angle between a horizontal line between two adjacent fixed pillars and the center of the circular base is 120°, that is, the three fixed pillars arranged on the circular base are circumferentially spaced 120° apart, and a plurality of pillar holes arranged axially are provided on the fixed pillars, and an annular bracket hole is provided on the annular bracket, which is sleeved on the outside of the three fixed pillars, and the annular bracket hole can be fixedly connected to the pillar holes at corresponding positions by bolts.

[0013] Preferably, the annular bracket comprises an upper annular bracket, a middle annular bracket and a lower annular bracket having the same structure.

[0014] Preferably, the diameter of the support hole is 5 mm, and the distance between two adjacent support holes is 5 mm; the diameter of the annular bracket hole is 5 mm.

[0015] The present invention also provides a layered fixing method for acoustic emission probes of a uniaxially compressed coal-rock assembly, comprising the following steps: Step 1: Place the pre-prepared coal-rock assembly sample in the middle of the circular base; Step 2: adjust the position of the annular bracket, and then fix the annular bracket using the support holes and bolts; Step 3: Place the acoustic emission probe into the accommodating cavity of the fixing part and install it on the annular bracket track; Step 4: Rotate the fixing parts on each annular bracket to a preset angle, evenly apply vaseline coupling agent on the surface of the acoustic emission probe, adjust the position of the spring bottom cover, make the surface of the acoustic emission probe in close contact with the surface of the coal-rock combination sample, lead the acoustic emission sensor connecting wire out of the lead groove, and connect it to the amplifier; Step 5: After all acoustic emission probes are installed, the support part is placed under the pressure head of the press, and the centers of the four parts, namely, the pressure head of the press, the coal-rock combination sample, the annular support and the circular base, are coaxial; Step 6: Start the acoustic emission monitoring system, conduct a lead breaking experiment, calibrate the acoustic emission probe, and start the uniaxial compression coal-rock combination acoustic emission test after each acoustic emission probe is successfully calibrated; Step seven, after the test loading is completed, first release the pressure on the press, then take out the destroyed coal-rock combination sample, and finally take out the acoustic emission probe and wipe it clean.

[0016] Compared with the prior art, the present invention has achieved the following technical effects: The present invention solves the problems that, during the current indoor uniaxial compression coal-rock combination acoustic emission test, the acoustic emission probe has poor contact with the surface of the coal-rock combination and the probe is easy to fall off when subjected to force loading; an annular bracket is sleeved on the outside of the coal-rock combination sample, a fixing part is arranged on the annular bracket, one end of the acoustic emission probe is connected to an elastic part, and the other end is always in contact with the side wall of the coal-rock combination sample; due to the limiting effect of the annular bracket and the elastic force of the elastic part, the surface of the acoustic emission probe is always in close contact with the side wall of the coal-rock combination sample during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic structural diagram of one embodiment of a device for fixing acoustic emission probes for uniaxial compression of coal-rock assemblies according to the present invention; Figure 2 for Figure 1 A top view of Figure 3 A cross-sectional view of one embodiment of the fixed support of the present invention; Figure 4 It is a plan view of one embodiment of the annular bracket of the present invention; Figure 5 It is a schematic structural diagram of one embodiment of the fixing part of the present invention; Figure 6 It is a left side view of the structure of one embodiment of the fixing part of the present invention.

[0019] In the figure: 1-circular base, 2-fixed pillar, 21-pillar hole, 3-annular bracket, 31-upper annular bracket, 32-middle annular bracket, 33-lower annular bracket, 34-annular bracket hole, 35-annular bracket track, 4-fixing part, 41-rubber ring, 42-housing, 421-housing hole, 43-acoustic emission probe, 44-acoustic emission sensor connecting line, 45-spring, 46-lead groove, 47-spring bottom cover, 471-spring bottom cover hole, 48-pad, 49-slide groove. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The purpose of the present invention is to provide a layered fixing device and method for an acoustic emission probe of a uniaxially compressed coal-rock assembly to solve the problems existing in the above-mentioned prior art. During the acoustic emission test of the uniaxially compressed coal-rock assembly, the acoustic emission probe will not fall off.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] The conventional method of fixing the acoustic emission probe is to first apply vaseline on the surface of the acoustic emission probe, and then fix it with an elastic bandage and glue. However, as the axial stress of the acoustic emission probe increases, the elastic bandage will break, causing the acoustic emission probe to fall off, and the acoustic emission signal of the remaining loading process cannot be collected. At the same time, if glue is used for fixing, it is very difficult to clean the acoustic emission probe after the test. In addition, when replacing other assembly specimens, the acoustic emission probe needs to be repeatedly disassembled and assembled, which not only wastes time, but also seriously shortens the service life of the acoustic emission probe.

[0024] In order to solve the problems encountered in the known technology, the present invention provides a uniaxial compression coal-rock assembly acoustic emission probe layer fixing device, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, it includes a support portion, which includes a circular base 1 and a fixed support 2. In this embodiment, three fixed supports 2 are arranged in sequence along the circumferential direction on the circular base 1, and an annular bracket 3 is sleeved on the outer side of the three fixed supports 2. The fixed supports 2 are provided with a plurality of support holes 21 arranged along the axial direction, and an annular bracket 3 is provided with an annular bracket hole 34. The diameter of the support hole 21 is 5 mm, and the distance between two adjacent support holes 21 is 5 mm; the diameter of the annular bracket hole 34 is 5 mm, and the annular bracket 3 is sleeved on the outer side of the plurality of fixed supports 2, and the annular bracket hole 34 can be fixedly connected with the support hole 21 at the corresponding position by bolts, so as to achieve The height position of the annular bracket 3 on the fixed support 2 is adjusted to be suitable for different samples. The circular base 1 is used to fix the coal-rock combination sample. The upper part of the coal-rock combination sample is inserted into the annular bracket 3, and the circular base 1, the coal-rock combination sample and the annular bracket 3 are coaxially arranged; a plurality of fixing parts 4 are provided on the annular bracket 3, and the fixing part 4 includes a horizontally arranged accommodating cavity, and the accommodating cavity is used to place an acoustic emission probe 43. One end of the acoustic emission probe 43 extends from the accommodating cavity and abuts against the side wall of the coal-rock combination sample, and the other end is connected to the bottom of the accommodating cavity through an elastic member. The elastic member in this embodiment is a spring 45.

[0025] When in use, first put the coal-rock combination sample into the circular base 1, and then adjust the annular bracket 3 to the corresponding position of the coal-rock combination sample; install the acoustic emission probe 43 into the accommodating cavity, and apply vaseline coupling agent on the surface of the acoustic emission probe 43 in contact with the sample, and then install the fixing part 4 on the annular bracket 3 and adjust it to a preset angle; adjust the fixing part 4 so that the acoustic emission probe 43 is in full and close contact with the surface of the coal-rock combination sample, and the spring 45 is in a compressed state at this time, and carry out the coal-rock combination acoustic emission test. Since one end of the acoustic emission probe 43 is connected to the spring 45, the other end is always in contact with the coal-rock combination. The side wall of the sample is abutted. Due to the limiting effect of the annular bracket 3 and the elastic force of the spring 45, the surface of the acoustic emission probe 43 is always in close contact with the side wall of the coal-rock combination sample during the test. After the test is completed, the fixing part 4 is adjusted, the sample is removed, and a new sample is replaced on the circular base 1. Then the fixing part 4 is readjusted to carry out the next test. Since the acoustic emission probe 43 is not fixed to the sample by elastic bandages and glue, the loss caused by repeated disassembly and assembly of the acoustic emission probe 43 when replacing the sample during the test can be reduced, the service life of the acoustic emission probe 43 is extended, and the success rate of the test is improved.

[0026] In a specific embodiment, the fixing portion 4 includes a shell 42 and a spring bottom cover 47, one end of the spring bottom cover 47 is open and the other end is closed, and an axial through hole is provided on the side wall of the spring bottom cover 47, and the cross section of the axial through hole matches the cross section of the shell 42; one end of the shell 42 is inserted into the axial through hole from the open end of the spring bottom cover 47, and a plurality of shell holes 421 are sequentially provided on the side wall of the shell 42 along the axial direction, and a spring bottom cover hole 471 is provided on the side wall of the spring bottom cover 47, and the spring bottom cover hole 471 can be aligned with one of the shell holes 421. The outer shell 42 and the spring bottom cover 47 are aligned and fixed with screws to achieve fixation between the outer shell 42 and the spring bottom cover 47; the interior of the outer shell 42 and the interior of the spring bottom cover 47 are communicated and form a accommodating cavity; the acoustic emission probe 43 is located in the outer shell 42, and its end away from the coal-rock combination sample is fixedly connected to the cushion block 48, one end of the spring 45 is connected to the end of the cushion block 48 away from the acoustic emission probe 43, and the other end is connected to the inner bottom of the spring bottom cover 47, and the axial distance between the spring bottom cover 47 and the outer shell 42 is changed, so as to achieve the adjustment of the elastic force of the spring 45.

[0027] In another embodiment, the outer diameter of the spring bottom cover 47 is smaller than the inner diameter of the outer shell 42, so that the spring bottom cover 47 is inserted into the outer shell 42, and the other structures are the same as the above scheme, and the fixation between the spring bottom cover 47 and the outer shell 42 can also be achieved. In addition, the inner diameter of the spring bottom cover 47 can be larger than the outer diameter of the outer shell 42, and one end of the outer shell 42 is inserted into the spring bottom cover 47 from the open end of the spring bottom cover 47, and the other structures remain unchanged, and the adjustment of the axial distance between the spring bottom cover 47 and the outer shell 42, as well as the fixation between the spring bottom cover 47 and the outer shell 42 can also be achieved.

[0028] In this embodiment, a lead groove 46 is provided on the side wall of the shell 42. The lead groove 46 is used to pass the acoustic emission sensor connecting line 44 of the acoustic emission probe 43. The acoustic emission sensor connecting line 44 is externally connected to an amplifier and an acoustic emission monitoring system. The amplifier preliminarily amplifies the weak acoustic emission signal detected by the acoustic emission probe 43 to improve the signal-to-noise ratio. The acoustic emission monitoring system is used to collect the amplified acoustic emission signal and analyze and process it. The amplifier and the acoustic emission monitoring system are both known structures, so they are not described in detail. The lead groove 46 adopts an elliptical groove. When adjusting the position of the spring bottom cover 47, a certain amount of moving space can be left for the acoustic emission sensor connecting line 44 to avoid breaking the acoustic emission sensor connecting line 44 during adjustment.

[0029] In order to better fix the acoustic emission probe 43, a rubber ring 41 is fixedly provided at the end of the shell 42 away from the spring bottom cover 47. The inner diameter of the rubber ring 41 is smaller than the outer diameter of the acoustic emission probe 43, and the end of the acoustic emission probe 43 away from the spring bottom cover 47 is inserted into the rubber ring 41.

[0030] An annular bracket track 35 is provided on the annular bracket 3 of the present embodiment; an annular flange is fixedly provided on the outer wall of the outer shell 42 away from the spring bottom cover 47, and a slide groove 49 with a bottom opening is provided on the side wall of the annular flange, and the slide groove 49 is slidably set on the annular bracket track 35. At this time, the outer shell 42 and the spring bottom cover 47 are horizontally arranged at the lower part of the annular bracket 3, and the slide groove 49 and the annular bracket track 35 are slidably arranged, so that the fixing part 4 can slide along the annular bracket track 35. The annular bracket 3 of the present embodiment includes an upper annular bracket 31, a middle annular bracket 32 ​​and a lower annular bracket 33 with the same structure, so as to realize the detection of multiple positions.

[0031] The present invention is suitable for coal-rock combination samples with a standard cylindrical structure of 50 mm in diameter and 100 mm in height, and is more suitable for ternary coal-rock combination samples (or rock-coal, coal-rock binary combinations) with different coal-rock thickness ratios. A circular base 1 and three fixed pillars 2 are used, and an annular bracket 3 that can be adjusted up and down is matched to a preset position. At the same time, the fixing part 4 on the annular bracket 3 can drive the acoustic emission probe 43 to rotate 120° in the circumferential direction. A rubber ring 41 is provided on one side of the housing 42 to fix the extension amount of the probe, and a spring 45 is provided on the other side to ensure that the spring 45 is in a compressed state during the test, so that the acoustic emission probe 43 always maintains a close contact state with the sample surface.

[0032] On the basis of the above scheme, the present invention also provides a layered fixing method of a uniaxially compressed coal-rock assembly acoustic emission probe 43, comprising the following steps: Step 1: Place the pre-prepared coal-rock assembly sample in the middle of the circular base 1; Step 2: adjust the position of the annular bracket 3, and then fix the annular bracket 3 using the support holes 21 and bolts; Step 3: Place the acoustic emission probe 43 into the accommodating cavity of the fixing portion 4 and install it on the annular support track 35; Step 4: Rotate the fixing parts 4 on each annular bracket 3 to a preset angle, apply vaseline coupling agent evenly on the surface of the acoustic emission probe 43, adjust the position of the spring bottom cover 47, make the surface of the acoustic emission probe 43 in close contact with the surface of the coal-rock combination sample, and the spring 45 is in a compressed state at this time. Then align the spring bottom cover hole 471 with the shell hole 421 at the corresponding position and fix them with screws, lead the acoustic emission sensor connecting wire 44 out of the lead groove 46, and connect it to the amplifier; Step 5: After all the acoustic emission probes 43 are installed, the support part is placed under the pressure head of the press, and the centers of the pressure head of the press, the coal-rock combination sample, the annular support 3, and the circular base 1 are coaxial; Step six, turn on the acoustic emission monitoring system, check the acoustic emission probe 43, and perform a lead break test. The lead break test is a commonly used acoustic emission system performance test method. By simulating the acoustic emission signal generated when the material breaks, the lead break test can evaluate the sensitivity, response time and signal quality of the acoustic emission system. This test method is widely used in the calibration and verification of the acoustic emission system to ensure that the system can accurately detect and analyze the acoustic emission signals of materials or structures in practical applications. It belongs to a known technology and is not described in detail. The purpose is to detect whether the acoustic emission probes 43 are all connected successfully. If the acoustic emission probes 43 all generate signals, start the uniaxial compression coal-rock combination acoustic emission test, otherwise adjust the acoustic emission probes 43 to a suitable position; then start the uniaxial compression coal-rock combination acoustic emission test; Step seven, after the test loading is completed, the press is first depressurized, and then the destroyed coal-rock combination sample is taken out, and the acoustic emission probe 43 is taken out and cleaned.

[0033] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A uniaxial compression coal-rock assembly acoustic emission probe layer fixing device, characterized in that: include: A support portion, wherein a horizontally arranged annular bracket is provided on the support portion, and the height position of the annular bracket on the support portion can be adjusted, the annular bracket is used to place a coal-rock combination sample, and the coal-rock combination sample is coaxially arranged with the annular bracket; The fixing part is arranged on the annular bracket, and includes a horizontally arranged accommodating cavity, in which the acoustic emission probe is placed. One end of the acoustic emission probe extends from the accommodating cavity and abuts against the side wall of the coal-rock combination sample, and the other end is connected to the bottom of the accommodating cavity through an elastic member.

2. The uniaxial compression coal-rock assembly acoustic emission probe layer fixing device according to claim 1 is characterized by: The fixing part includes an outer shell and a spring bottom cover, wherein one end of the spring bottom cover is open and the other end is closed, and an axial through hole is provided on the side wall of the spring bottom cover, and the cross section of the axial through hole matches the cross section of the outer shell; one end of the outer shell is inserted into the axial through hole from the open end of the spring bottom cover, and the outer shell and the spring bottom cover can be fixed; the interior of the outer shell and the interior of the spring bottom cover are connected to form the accommodating cavity; the side wall of the outer shell is provided with a lead groove, and the lead groove is used to pass the acoustic emission sensor connecting line of the acoustic emission probe.

3. The uniaxial compression coal-rock assembly acoustic emission probe layer fixing device according to claim 2 is characterized by: A pad is provided in the accommodating cavity, the acoustic emission probe is located in the outer shell, and one end of the acoustic emission probe away from the coal-rock combination sample is fixedly connected to the pad, one end of the elastic member is connected to the end of the pad away from the acoustic emission probe, and the other end is connected to the inner bottom of the spring bottom cover.

4. The uniaxial compression coal-rock assembly acoustic emission probe layer fixing device according to claim 2 is characterized by: A plurality of shell holes are sequentially opened on the shell side wall along the axial direction, and a spring bottom cover hole is opened on the spring bottom cover side wall. The spring bottom cover hole can be aligned with one of the shell holes and fixed with screws.

5. The uniaxial compression coal-rock assembly acoustic emission probe layer fixing device according to claim 2 is characterized in that: A rubber ring is fixedly arranged at one end of the housing away from the spring bottom cover, the inner diameter of the rubber ring is smaller than the outer diameter of the acoustic emission probe, and one end of the acoustic emission probe away from the spring bottom cover is inserted into the rubber ring.

6. The uniaxial compression coal-rock assembly acoustic emission probe layer fixing device according to claim 2 is characterized by: The annular bracket is provided with an annular bracket track; an annular flange is fixedly provided on the outer wall of the shell away from the spring bottom cover, and the side wall of the annular flange located at the upper part of the shell is provided with a slide groove with a bottom opening, and the slide groove is slidably arranged on the annular bracket track.

7. The uniaxial compression coal-rock assembly acoustic emission probe layer fixing device according to claim 1 is characterized by: The support part includes a circular base, on which three vertically arranged fixed pillars are fixed, and the fixed pillars are provided with a plurality of pillar holes arranged along the axial direction. The annular bracket is provided with an annular bracket hole, and the annular bracket is sleeved on the outside of the three fixed pillars, and the annular bracket hole can be fixedly connected with the pillar holes at corresponding positions by bolts.

8. The uniaxial compression coal-rock assembly acoustic emission probe layer fixing device according to claim 1 is characterized by: The annular support comprises an upper annular support, a middle annular support and a lower annular support with the same structure.

9. The uniaxial compression coal-rock assembly acoustic emission probe layer fixing device according to claim 7, characterized in that: The diameter of the support hole is 5 mm, and the distance between two adjacent support holes is 5 mm; the diameter of the annular bracket hole is 5 mm.

10. A method for fixing acoustic emission probes in layers under uniaxial compression of coal-rock assemblies, characterized in that: The steps include: Step 1: Place the pre-prepared coal-rock assembly sample in the middle of the circular base; Step 2: adjust the position of the annular bracket, and then fix the annular bracket using the support holes and bolts; Step 3: Place the acoustic emission probe into the accommodating cavity of the fixing part and install it on the annular bracket track; Step 4: Rotate the fixing parts on each annular bracket to a preset angle, evenly apply vaseline coupling agent on the surface of the acoustic emission probe, adjust the position of the spring bottom cover, make the surface of the acoustic emission probe in close contact with the surface of the coal-rock combination sample, lead the acoustic emission sensor connecting wire out of the lead groove, and connect it to the amplifier; Step 5: After all acoustic emission probes are installed, the support part is placed under the pressure head of the press, and the centers of the four parts, namely, the pressure head of the press, the coal-rock combination sample, the annular support and the circular base, are coaxial; Step 6: Start the acoustic emission monitoring system, conduct a lead breaking experiment, calibrate the acoustic emission probe, and start the uniaxial compression coal-rock combination acoustic emission test after each acoustic emission probe is successfully calibrated; Step seven, after the test loading is completed, first release the pressure on the press, then take out the destroyed coal-rock combination sample, and finally take out the acoustic emission probe and wipe it clean.

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