In-situ acoustic emission measurement device under high temperature and high pressure

Abstract

The present application relates to a kind of in-situ acoustic emission measuring devices under high temperature and high pressure, by being arranged in heating assembly to simulate the sample experiment of acoustic emission detection in high temperature environment;And anvil is respectively arranged on the six faces of cubic frame symmetrically, so that anvil moves along guide channel to extrude cubic as pressure medium in chamber, on the one hand, anvil movement can simulate high pressure environment, on the other hand, the symmetry of detector and the synchronism of movement are conducive to the accurate positioning of acoustic emission source;And, electrode main body is contacted with heating assembly, electrode pin is covered to the upper end surface of cover and is connected with anvil to be electrified, can reduce the contact area of electrode sheet and anvil, reduce the temperature of anvil bottom and detector, protect detector from the influence of high temperature and high pressure environment, to make high temperature, high pressure and acoustic emission combine, realize the acoustic emission measurement of material or mineral, obtain the in-situ rheological property of mineral under high temperature and high pressure environment, study the cause of deep source earthquake.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of acoustic emission measurement device, in particular to an in-situ acoustic emission measurement device under high temperature and high pressure. BACKGROUND

[0002] Acoustic emission is a process of rapid release of energy accumulated in the material in the form of mechanical waves, and acoustic emission detection method has the characteristics of high sensitivity, real-time in-service detection, non-destructive, simple operation, rich information, etc., and has played an important role in the fields of tool monitoring in processing industry, pressure vessel monitoring, mechanical component monitoring, leakage detection, etc. In geophysical science, through acoustic emission technology, the position of rock crack and the stress and fracture mechanism of rock fracture can be located at the same time, and the generation, expansion and fracture of micro-cracks of rock under stress are theoretically explored. However, the current research on the behavior of rock under stress generally stays at normal temperature and pressure, while the minerals in the earth's interior are under high temperature and high pressure. The research on the fracture of rock under stress at normal temperature and pressure cannot accurately reflect the behavior of rock in the earth's interior, so the combination of acoustic emission technology and high temperature and high pressure experimental environment can more truly reflect the generation, expansion and fracture of micro-cracks in the earth's interior.

[0003] At present, the combination of high temperature and high pressure and acoustic emission faces many technical difficulties. On the one hand, the sensor is difficult to work normally under high temperature and high pressure; on the other hand, the sample size is relatively small, the diversity of acoustic emission source mechanism, the instability of signal propagation path and external signal interference factors, as well as the burstness and transientness of energy release in the material, make it difficult to collect and locate, and also put forward higher requirements on the accuracy of acoustic emission signal collection and analysis. SUMMARY

[0004] The problem solved by the present application is how to make the acoustic emission measurement device perform acoustic emission measurement of materials or minerals under high temperature and high pressure, and obtain the in-situ rheological properties of minerals under high temperature and high pressure environment. In order to solve the above problems, the present application provides an in-situ acoustic emission measurement device under high temperature and high pressure, comprising:

[0005] A heating assembly is used to form a high temperature environment, and the sample is arranged in the heating assembly to simulate sample experiments in which the acoustic emission detection is in a high temperature environment.

[0006] A cube is used as a pressure transmission medium, and a heating channel penetrating through two symmetrical faces of the cube is formed on the cube, and the heating assembly is arranged in the heating channel; a cover is arranged at the channel opening at each end of the heating channel.

[0007] Two electrode sheets, each of the electrode sheets comprising an electrode body and an electrode pin arranged circumferentially on the outer periphery of the electrode body, the cover corresponding to one side in the heating channel is an inner cover surface, and the other side outside the heating channel is an outer cover surface, the electrode body is attached to the inner cover surface of the cover and contacts the heating assembly, and the electrode pin is covered from the inner cover surface of the cover to the outer cover surface of the cover;

[0008] A cubic frame, an inner part of the cubic frame is provided with a chamber, and a guide channel is formed on each frame surface of the cubic frame and communicates with the chamber;

[0009] Six anvils are movably inserted into each of the guide channels, and the inner end surfaces of each of the anvils are simultaneously moved into the chamber and surround a space for accommodating the cubic, the inner end surfaces of the anvils are flat surfaces for pressing the corresponding surfaces of the cubic, and two electrode pins are electrically connected to the corresponding anvils to make the heating assembly work and heat.

[0010] Six support anvils are connected to the outer ends of the anvils, each of the support anvils is used for abutting against a pressure loading oil cylinder to push the anvil to extrude the cubic to generate high pressure, a detection groove is formed at the center of the support anvil, and a detector for emitting acoustic emission to the sample is arranged in the detection groove, the detector is used for detecting the sample, and the detector is arranged in the detection groove.

[0011] The heating assembly is arranged, the sample is arranged in the heating assembly to simulate the sample experiment in a high-temperature environment, the anvils are symmetrically arranged on the six surfaces of the cubic frame, the pressure loading oil cylinder provides power, the anvils are moved along the guide channels into the chamber to extrude the cubic as a pressure transmission medium, on one hand, the movement of the anvils can simulate a high-pressure environment, and on the other hand, the symmetry of the detector and the movement synchronization are beneficial to the accurate positioning of the acoustic emission source, the electrode body contacts the heating assembly, the electrode pin is covered to the upper end surface of the cover and abuts against the anvil to be electrified, the contact area of the electrode sheet and the anvil can be reduced, the temperature of the bottom of the anvil and the detector can be reduced, the detector is protected from the influence of the high-temperature and high-pressure environment, the high-temperature, high-pressure and acoustic emission are combined, the acoustic emission measurement of the material or the mineral is realized, the in-situ rheological properties of the mineral in the high-temperature and high-pressure environment are obtained, and the causes of the deep-source earthquake are studied.

[0012] As preferred, the heating assembly comprises a heating pipe with open ends, the ports at the two ends of the heating pipe contact the electrode body, a crucible for placing the sample is arranged in the lumen of the heating pipe, a dense piston and a porous piston are sequentially filled in the lumen corresponding to the upper and lower ends of the crucible, the heating pipe is arranged in the heating channel, and a heat preservation layer is arranged between the inner wall of the heating channel and the outer wall of the heating pipe.

[0013] As preferred, the dense piston and the porous piston are both made of alumina, and by sequentially filling the dense piston and the porous piston made of alumina in the heating tube, the sample can be protected from stress in the initial pressing stage of the anvil moving to extrude the cube.

[0014] As preferred, a mixture standard sample corresponding to the sample is further arranged in the lumen of the heating tube, the mixture standard sample is a mixture of sodium chloride and nickel, and is used for real-time detection of the pressure value in the cube, so as to improve the accuracy.

[0015] As preferred, the heating tube is made of graphite, and the heat preservation layer and the cover are both made of zirconium dioxide, which is beneficial to heat insulation.

[0016] As preferred, the electrode sheet is a molybdenum electrode, so that the electrode cannot be broken down in a high-temperature and high-pressure environment, and the working efficiency and service life of the heating device are improved.

[0017] As preferred, the support anvil is connected with the anvil through a copper hoop, and the anvil and the support anvil are both made of tungsten carbide; the detector is arranged in the detection groove of the support anvil, so that the replacement time of the detector is short, the repeated detection efficiency is high, and the signal line of the detector is arranged in the avoiding groove, so that the signal line is prevented from contacting the anvil, the detector and the signal line are protected from high pressure and high temperature, and the repeated utilization rate of the detector is improved.

[0018] As preferred, the cube is made of amorphous boron, the sealing property and the flowability of the amorphous boron pressure transmission medium are good, the noise level of the cube is low, the amorphous boron material has low thermal conductivity, the protection performance of the cube is improved, and stable testing of acoustic emission under high temperature and high pressure is realized.

[0019] As preferred, the side wall of the support anvil is provided with a wiring groove in communication with the detection groove, and the signal line of the detector is arranged in the wiring groove, so that the signal line is prevented from contacting the anvil, the detector and the signal line are protected from high pressure and high temperature, and the repeated utilization rate of the detector is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic view of the present application;

[0021] Figure 2 It is a sectional schematic view of the present application; Figure 1

[0022] Figure 3 It is a structural schematic view of the cube of the present application;

[0023] Figure 4 It is a sectional schematic view of the cube and the heating assembly in the heating channel of the present application;

[0024] ​Figure 5 A schematic diagram of the electrode sheet of the present application;

[0025] Figure 6 A schematic diagram of the electrode sheet and cover combination of the present application;

[0026] Figure 7 A schematic diagram of the support anvil of the present application;

[0027] Figure 8 A schematic diagram of the sample in the demonstration experiment of the present application;

[0028] Figure 9 A sound emission positioning result map obtained in the demonstration experiment of the present application.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 1, heating assembly; 1.1, heating pipe; 1.2, crucible; 1.3, dense piston; 1.4, porous piston; 1.5, insulation layer; 2, cube; 2.1, heating channel; 3, cover; 4, electrode sheet; 4.1, electrode body; 4.2, electrode pin; 5, cube frame; 5.1, guide channel; 6, anvil; 7, space; 8, support anvil; 8.1, detection groove; 8.2, wiring groove; 9, detector; 10, mixture standard sample; 11, copper hoop; DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the drawings.

[0032] A high-temperature and high-pressure in-situ sound emission measurement device, which is powered by a pressure loading oil cylinder (not shown in the figure), in the embodiment, the pressure loading oil cylinder is a six-cylinder cubic shape pressure machine, which includes an oil pump and six working oil cylinders, the oil pump independently supplies oil to the six working oil cylinders, each working oil cylinder provides power for the in-situ sound emission measurement device, so as to perform sound emission detection on the sample to be detected; the in-situ sound emission measurement device in the embodiment is shown in Figures 1-2 , which includes:

[0033] The cube frame 5 has a cavity 5.1 in the interior, and a guide channel 5.2 is formed on each frame surface of the cube frame 5 and communicates with the cavity 5.1, and the guide channels 5.2 on every two symmetrical frame surfaces are symmetrical to each other;

[0034] Six anvils 6 are movably inserted in each guide channel 5.2, and the six anvils 6 are simultaneously moved along the guide channel 5.2 under the action of the force of the pressure loading oil cylinder, the inner ends of the anvils 6 extend into the chamber 5.1 and enclose a space 7 as the anvils 6 move, the space 7 is provided with a cube 2, the inner end face of the anvil 6 is a plane, which is used to press the corresponding face of the cube 6, and the cube generates high pressure under the extrusion of the anvil 6 to form a high pressure environment; in the embodiment, in order to make the anvil 6 extrude the cube 2 under the action of the pressure loading oil cylinder to generate high pressure and form a vacuum high pressure environment, the cube 2 is made of amorphous boron material as a pressure transmission medium, the amorphous boron material has good sealing performance and fluidity, can reduce the number of acoustic emission noise, and the amorphous boron material has low thermal conductivity, which can improve the protection performance of the cube 2, and then realize stable testing of acoustic emission under high temperature and high pressure conditions; at the same time, in order to realize the high temperature environment of the acoustic emission device, the cube 2 is provided with a heating channel 2.1 penetrating through two symmetrical faces of the cube 2, as shown in Figure 3 , the heating channel 2.1 is provided with a heating assembly 1 for forming a high temperature environment, and the sample is arranged in the heating assembly 1 to simulate a high temperature sample experimental environment for acoustic emission detection; the channel openings at both ends of the heating channel 2.1 are respectively provided with a cover 3, as shown in Figure 4 ; wherein:

[0035] The heating assembly 1 comprises a heating tube 1.1 with open ends, the ports at both ends of the heating tube 1.1 are in contact with the electrode body, the heating tube 1.1 is provided with a crucible 1.2 for placing a sample in the lumen of the heating tube 1.1, the upper and lower ends of the crucible 1.2 in the lumen of the heating tube 1.1 are sequentially filled with a dense piston 1.3 and a porous piston 1.4, the heating tube 1.1 is arranged in the heating channel 2.1, and a heat preservation layer 1.5 is arranged between the inner wall of the heating channel 2.1 and the outer wall of the heating tube 1.1; in the embodiment, the dense piston 1.3 and the porous piston 1.4 are both made of alumina material, by sequentially filling the dense piston 1.3 and the porous piston 1.4 made of alumina material in the heating tube 1.1, the sample can be protected from stress in the initial pressurizing stage of the anvil 6 moving to extrude the cube 2; the heating tube 1.1 is made of graphite material, and the heat preservation layer 1.5 and the cover 3 are both made of zirconium dioxide material, which is conducive to heat insulation;

[0036] The cover 3 is provided with an electrode sheet 4, the anvil 6 corresponding to the channel opening position of the cube 2 on the cube frame 5 is connected with the electrode sheet 4, and the electrode sheet 4 is electrified to make the heating assembly 1 work and heat, at the same time, in order to reduce the influence of the heating temperature on the anvil 6 under the premise of ensuring that the electrode sheet 4 is connected with the heating assembly 1 to work and heat, the electrode sheet 4 in the embodiment is connected with the heating assembly 1 to work and heat, as shown in Figure 5As shown, the electrode sheet 4 includes an electrode body 4.1 and electrode pins 4.2 arranged circumferentially on the outer periphery of the electrode body, and the structure of the electrode sheet 4 and the cover 3 is as shown in Figure 6 As shown, the cover 3 has an inner cover surface corresponding to one side surface inside the heating channel 2.1 and an outer cover surface corresponding to one side surface outside the heating channel 2.1, the electrode body 4.1 is attached to the inner cover surface of the cover 3 and contacts the pipe opening of the heating pipe 1.1 to be electrified and heated, the electrode pins 4.2 are covered from the inner cover surface of the cover 3 to the outer cover surface of the cover 3, and each electrode pin 4.2 is electrically connected to the corresponding anvil 6. In this embodiment, the electrode sheet 4 is a molybdenum electrode, thereby ensuring that the electrode will not be struck in a high-temperature and high-pressure environment, and improving the working efficiency and service life of the heating device.

[0037] The support anvil 8 is further provided, and each support anvil 8 is connected to the outer end of the corresponding anvil 6. In this embodiment, the support anvil 8 is connected to the anvil 6 through a copper hoop 11, and each support anvil 8 is connected to the pressure loading oil cylinder to push the anvil 6 to extrude the cube 2 to generate high pressure, as shown in Figure 7 As shown, a detection groove 8.1 is provided at the center of the support anvil 8, the detection groove 8.1 is provided with a detector 9 for acoustic emission of the sample, a wiring groove 8.2 is provided on the side wall of the support anvil 8 and communicates with the detection groove 8.1, and the signal line of the detector 9 is arranged in the wiring groove 8.2; the anvil 6 and the support anvil 8 are made of tungsten carbide; the detector 9 is arranged in the detection groove 8.1 of the support anvil 8, so that the replacement time of the detector 9 is short, the repeated detection efficiency is high, and at the same time, the signal line of the detector 9 is arranged in the wiring groove 8.2, so that the signal line is prevented from contacting the anvil 6, the detector 9 and the signal line are protected from the influence of high pressure and high temperature, and the repeated utilization rate of the detector 9 is improved.

[0038] In addition, a mixture standard sample 10 is further provided in the heating pipe 1.1 corresponding to the sample, the mixture standard sample 10 is a mixture of sodium chloride and nickel, and is used for real-time detection of the pressure value in the cube 2 to improve the accuracy.

[0039] Proof experiment

[0040] The sample of this embodiment is a wedge-shaped quartz column, as shown in Figure 8 As shown, the surface of the quartz column is processed into a sawtooth shape, the wedge-shaped quartz column is placed into the heating assembly 1 of the in-situ acoustic emission measurement device, the oil pressure of the pressure loading oil cylinder is increased to 50 bar, after the temperature and pressure in the in-situ acoustic emission measurement device are stabilized, the moving speed of the upper and lower anvil 6 of the cube frame 5 is set to-10 μm / min, the uniform deformation of the sample under high temperature and high pressure is started, the acoustic emission signal in the sample deformation process under high temperature and high pressure is monitored through the detector 9, the acoustic emission signal is positioned, and the acoustic emission positioning result is obtained as shown in Figure 9As shown, it can be found that the acoustic emission source is located in the central part of the sample, which is consistent with the shape of the wedge-shaped quartz column, thereby illustrating that the in-situ acoustic emission measuring device has high detection efficiency, detection accuracy and stability, and can be applied to in-situ rheological property change experiments of minerals under high temperature and high pressure and deformation environment.

[0041] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present disclosure.

Claims

1. An apparatus for in-situ acoustic emission measurement at high temperature and high pressure, characterized in that, The utility model relates to a kind of high-temperature acoustic emission detection device, including: Heating assembly (1) for forming high-temperature environment, sample is arranged in heating assembly (1) to simulate acoustic emission detection sample experiment in high-temperature environment; Cube (2) is used as pressure transmission medium, heating channel (2.1) is opened in the cube (2) and passes through two symmetrical surfaces of cube (2), and the heating assembly (1) is placed in heating channel (2.1);Channel mouth at both ends of the heating channel is respectively provided with cover (3); Two electrode sheets (4), each electrode sheet (4) includes electrode body (4.1) and electrode pin (4.2) peripherally arranged on the outer periphery of electrode body, the side of cover (3) located in heating channel (2.1) is inner cover surface, the side of cover located outside heating channel (2.1) is outer cover surface, the electrode body (4.1) is attached with the inner cover surface of cover (3) and contacts with heating assembly (1), and the electrode pin (4.2) is covered from the inner cover surface of cover (3) to the outer cover surface of cover (3); Cube frame (5), the inside of cube frame (5) is provided with chamber (5.1), and each frame surface of cube frame (5) is provided with guide channel (5.2) communicated with chamber (5.1); Six anvil (6) is respectively movably inserted in each guide channel (5.2), and the inner end surface of each anvil (6) is simultaneously moved and extends into chamber (5.1) and surrounds a space for accommodating cube, the inner end surface of the anvil is plane, for pressing the corresponding surface of cube, and two electrode pins (4.2) are respectively electrically connected with corresponding anvil (6) to make heating assembly (1) work and heat; Six support anvil (8) is connected to the outer end of anvil (6), and each support anvil (8) is used to be connected with pressure loading cylinder to push anvil (6) and extrude cube (2) to generate high pressure, and detection groove (8.1) is opened at the center of support anvil (8), and detector (9) for acoustic emission to sample is arranged in detection groove (8.1), and the detector (9) is used to detect sample, and the detector (9) is arranged in detection groove (8.1).

2. The in-situ acoustic emission measurement device under high temperature and high pressure according to claim 1, characterized in that, The heating assembly (1) includes two ends of the heating tube (1.1) with open, the port of the heating tube (1.1) is in contact with the electrode body, the crucible (1.2) for placing sample is arranged in the lumen of the heating tube (1.1), the upper and lower ends of the lumen correspond to the crucible (1.2) and are sequentially filled with dense piston (1.3) and porous piston (1.4), the heating tube (1.1) is arranged in the heating channel (2.1), and the heat preservation layer (1.5) is arranged between the inner wall of the heating channel (2.1) and the outer wall of the heating tube (1.1).

3. The in-situ acoustic emission measurement device under high temperature and high pressure according to claim 2, characterized in that, The dense piston (1.3) and the porous piston (1.4) are both made of alumina.

4. The in-situ acoustic emission measurement device under high temperature and high pressure according to claim 2, characterized in that, The lumen of the heating tube (1.1) is also provided with a mixture standard sample (10) corresponding to the sample, and the mixture standard sample (10) is a mixture of sodium chloride and nickel.

5. The in-situ acoustic emission measurement device under high temperature and high pressure according to claim 2, characterized in that, The heating tube (1.1) is made of graphite material, the heat preservation layer (1.5) and the cover (3) are made of zirconium dioxide material.

6. The in-situ acoustic emission measurement device under high temperature and high pressure according to claim 1, characterized in that, The electrode sheet (4) is a molybdenum electrode.

7. The in-situ acoustic emission measurement device under high temperature and high pressure according to claim 1, characterized in that, The support anvil (8) is connected with the anvil (6) through a copper hoop (11), and the anvil (6) and the support anvil (8) are made of tungsten carbide material.

8. The in-situ acoustic emission measurement device under high temperature and high pressure according to claim 1, characterized in that, The cube (2) is made of amorphous boron material.

9. The in-situ acoustic emission measurement device under high temperature and high pressure according to claim 1, characterized in that, A wire slot (8.2) is formed in the side wall of the support anvil (8) and communicates with the detection slot (8.1), and the signal wire of the detector (9) is arranged in the wire slot (8.2).

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