Device for monitoring microwave crack evolution in real time

Abstract

The invention belongs to the field of rock mass crack research experiments, and provides a device for monitoring microwave crack evolution in real time, which comprises a microwave power supply, a microwave generator, a connecting waveguide, a multi-mode cavity, a bearing part, a cut-off waveguide and an imaging acquisition assembly, the microwave generator is connected with the multi-mode cavity through the connecting waveguide, the bearing part is arranged in the multi-mode cavity, a sample is placed on the bearing part, microwaves can penetrate through the bearing part, the cut-off waveguide is installed on the multi-mode cavity, an outlet of the cut-off waveguide is provided with the imaging acquisition assembly, and the imaging acquisition assembly is connected with the multi-mode cavity through the connecting waveguide. The image acquisition assembly is aligned with a sample to acquire an image of the sample; the microwave generator generates microwaves to act on the rock sample, the rock sample is heated to generate cracks, the rock sample is shot in real time through the imaging acquisition assembly, rock crack evolution in the microwave action process can be monitored and recorded in real time, rock crack development and evolution laws can be observed in real time, and mineral volume expansion can be quantitatively evaluated.

Description

Technical Field

[0001] The invention belongs to the field of rock crack research experiments, and in particular relates to a device for real-time monitoring of microwave crack evolution. Background Art

[0002] As the depth of resource occurrence increases, the strength of rock mass increases nonlinearly. Mechanical methods and drilling and blasting methods restrict the development of deep-earth resources due to their shortcomings such as severe tool wear and large disturbance. Microwave, as a new auxiliary rock-breaking technology with a wide fracturing range, high heating efficiency and environmental friendliness, is expected to solve the above problems. However, most of the current research on microwaves focuses on the analysis of rock strength and crack parameters after microwave treatment of hard rocks, lacks the capture of the real-time evolution of cracks between minerals during microwave action, resulting in a vague understanding of the rock destruction mechanism under microwave action. At the same time, microwaves are a highly efficient heating technology, and the inharmonious deformation of minerals during the action process has not been deeply studied. Therefore, the real-time monitoring device for the evolution of rock cracks during microwave action designed by the patent of this invention can not only observe the development and evolution of rock cracks in real time, but also quantitatively evaluate the volume expansion of minerals. It is an important means to clarify the correlation between crack development and thermal stress, and it is also an important prerequisite for in-depth revelation of the microwave-assisted rock-breaking mechanism. It is of great significance to promote the application of microwave engineering. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a device for real-time monitoring of microwave crack evolution to solve the problems in the prior art. The technical solution adopted by the present invention is: A device for real-time monitoring of microwave crack evolution, comprising: a microwave power supply, a microwave generator, a connecting waveguide, a multi-mode cavity, a bearing component, a cutoff waveguide and an imaging acquisition component; The microwave power supply is connected to the microwave generator, and the microwave generator is connected to the multi-mode cavity through the connecting waveguide to emit microwaves into the multi-mode cavity. The bearing component is arranged in the multi-mode cavity, and the bearing component is used to place the sample. The bearing component is transparent to microwaves. The cutoff waveguide is installed on the multi-mode cavity, and the imaging acquisition component is arranged at the outlet of the cutoff waveguide. The imaging acquisition component is aimed at the sample to acquire the image of the sample.

[0004] Further, the connecting waveguide includes a straight waveguide and a curved waveguide connected end to end, the inlet end of the straight waveguide is connected to the microwave generator, and the outlet end of the curved waveguide is connected to the multi-mode cavity; the straight waveguide is a rectangular waveguide, and its size satisfies the following formula conditions: , Integration gives: , in, f is the microwave frequency,a is the width of the straight waveguide, b is the height of the straight waveguide, and λ is the microwave wavelength.

[0005] Furthermore, the size of the cutoff waveguide satisfies the following formula: , in, f c is the cut-off frequency, D and L are the cut-off waveguide diameter and length, and SE is the shielding energy effectiveness.

[0006] Furthermore, the multi-mode cavity includes an upper concave bottom shell and a lower concave top shell, the top of the upper concave bottom shell is detachably connected to the lower concave top shell, the upper concave bottom shell and the lower concave top shell together form a chamber, and a bearing component is arranged between the upper concave bottom shell and the lower concave top shell.

[0007] Furthermore, the bearing member is a glass plate, the glass plate is arranged horizontally, and the upper surface of the glass plate is used to place the sample; The top of the upper concave bottom shell is connected to the vertically arranged cutoff waveguide, and the imaging acquisition component is located above the cutoff waveguide.

[0008] Further, the bearing component includes a glass shell and a hollow cylinder; The glass shell is annular, and the hollow part thereof is provided with the hollow cylinder. A first annular chamber is annularly provided inside the glass shell, and the first annular chamber is provided around the hollow cylinder. A first water inlet pipe and a first drain pipe connected to the first annular chamber are provided on both sides of the glass shell, and the first water inlet pipe and the first drain pipe are connected to an external cooling circulation component to form flowing circulating water in the first annular chamber.

[0009] Furthermore, the top of the upper concave bottom shell is detachably connected to a top plate, the top of the top plate is connected to a cover plate, a second annular chamber is provided between the cover plate and the top plate, and the second annular chamber is connected to an external cooling circulation component through a second water inlet pipe and a second drain pipe to form flowing circulating water in the second annular chamber.

[0010] Furthermore, the cover plate and the top plate are provided with a through hollow portion, an energy absorbing cylinder is slidably provided in the hollow portion, the second annular chamber is provided around the energy absorbing cylinder, and the energy absorbing cylinder is filled with microwave absorbing filler; an opening is provided at the bottom of the energy absorbing cylinder, and a thread is provided in the opening; the energy absorbing cylinder is coaxially provided with the hollow cylinder; The bottom of the hollow cylinder is provided with an annular tooth portion, the bottom of the hollow part of the glass shell is fixedly connected to the supporting gear ring, and the annular tooth portion cooperates with the supporting gear ring to form a circumferential constraint; the hollow cylinder is used to move downward and is threadedly connected to the hollow cylinder.

[0011] Furthermore, the side surface of the upper concave bottom shell is connected to the horizontally arranged cutoff waveguide.

[0012] Furthermore, a fixing plate and a plane mirror are arranged inside the upper concave bottom shell, and the plane mirror is arranged at an angle to reflect the sample to the imaging acquisition component; The fixing plate can be rotatably connected to an upper connecting rod and a lower connecting rod arranged horizontally, the upper connecting rod is located above the lower connecting rod, the upper connecting rod and the lower connecting rod can slidably pass through the upper concave bottom shell, and one end of the upper connecting rod and the lower connecting rod passing through the upper concave bottom shell can be movably connected to an adjusting vertical rod, the middle part of the adjusting vertical rod can be rotatably connected to one end of a telescopic rod, and the other end of the telescopic rod is fixedly connected to the outer side surface of the upper concave bottom shell; When the upper connecting rod and the lower connecting rod slide in the same direction, the position of the plane mirror can be adjusted; when the upper connecting rod and the lower connecting rod slide in opposite directions, the angle of the plane mirror can be adjusted.

[0013] The present invention has the following beneficial effects: the present invention generates microwaves through a microwave generator to act on rock samples, causing the rock samples to be heated and cracked, and uses an imaging acquisition component to photograph the rock samples in real time, which can monitor and record the crack evolution of the rock during the microwave action in real time, can observe the development and evolution laws of rock cracks in real time, and quantitatively evaluate the volume expansion of minerals. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of a rectangular straight waveguide; Figure 3 is a schematic diagram when the bearing component is a glass plate; Figure 4 It is a schematic diagram when the bearing component includes a glass shell and a hollow cylinder; Figure 5 It is a schematic diagram when the hollow cylinder is removed; Figure 6 It is a schematic diagram of a cross-section of a glass shell viewed from above. DETAILED DESCRIPTION

[0015] The following will be combined with the embodiments of the present invention Figure 1-Figure 6 , the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0016] like Figure 1, a device for real-time monitoring of microwave crack evolution, comprising: a microwave power supply, a microwave generator, a connecting waveguide, a multi-mode cavity, a bearing component, a cutoff waveguide 4 and an imaging acquisition component; The microwave power supply is connected to the microwave generator, and the microwave generator is connected to the multi-mode cavity through the connecting waveguide to emit microwaves into the multi-mode cavity. The bearing component is arranged in the multi-mode cavity, and the bearing component is used to place the sample. The bearing component is transparent to microwaves. The cutoff waveguide 4 is installed on the multi-mode cavity, and the imaging acquisition component is arranged at the outlet of the cutoff waveguide 4. The imaging acquisition component is aimed at the sample to acquire the image of the sample.

[0017] The microwave power supply and microwave generator are existing technologies. The microwave power supply and the microwave generator are connected by cables. The microwave power supply is connected to the power supply. The microwave power supply is controlled by a high-frequency power switch to supply power to the microwave generator. The microwave generator contains an excitation cavity, a magnetron and a filament power supply. The filament power supply is first preheated by the microwave power supply. During preheating, the filament power supply heats the magnetron cathode through an electric current. When heated to a sufficiently high temperature, the magnetron cathode generates an electron beam. The electron beam is emitted from the accelerating electrode and guided by the magnetic field generated by the magnetic field ring to form a curved electron beam. The energy change generated by the interaction between the electron beam and the magnetic field generates microwave radiation. At this time, the microwave is a TEM mode. The microwave is propagated into the excitation cavity in the form of an electromagnetic wave. When the microwave is transmitted to the excitation cavity through a coupler, the coupler converts the TEM mode microwave into TE through a specific guiding effect. 10 Module, (TE 10 The mold has the characteristics of simple and stable field structure, wide bandwidth and low loss), and is transmitted to a rectangular straight waveguide.

[0018] Furthermore, the connecting waveguide includes a straight waveguide and a curved waveguide connected end to end, the inlet end of the straight waveguide is connected to the microwave generator, and the outlet end 6 of the curved waveguide is connected to the multi-mode cavity.

[0019] The straight waveguide is a rectangular waveguide. Considering that the microwave generator transmits TE 10 mode, so the rectangular straight waveguide needs to meet the following requirements: (1) only transmit the main mode TE 10 ; (2) Sufficient power capacity (increase power capacity while avoiding breakdown); (3) Low loss. The specific size satisfies the following calculation formula: , Integration gives: , in, f is the microwave frequency, a is the width of the straight waveguide, bis the height of the straight waveguide; λ is the microwave wavelength, and the calculation formula is: c=λf, f is the microwave power frequency, for example, for a microwave power of 2.45GHz, λ=12.24cm after calculation; the derivation process of the above formula involves the analysis of the electromagnetic field, and the reasons for the selection of parameters are: 1. The waveguide of this design needs to suppress high-order modes, 2. Low loss, 3. High transmission power. Microwave transmission is carried out in different modes, and the TE required by the present invention 10 Module, TE 10 The cutoff frequency of the mode is the lowest, while the cutoff frequencies of other high-order modes are higher. This value can ensure that TE 10 Mode transmission. Low loss means that the energy is not lost in the form of heat, reflection or radiation during microwave energy transmission, ensuring that the microwave energy enters the cavity to the maximum extent and acts on the rock. High transmission power means avoiding excessive reflected power, so that more power enters the cavity.

[0020] like Figure 2 , such as microwave frequencies f The frequency is 2.45 GHz, corresponding to a wavelength of 12.24 cm. It is calculated that a is 8.568 cm; b ranges from 3.4272 to 4.284 cm. Considering the size of standard rectangular waveguide components, the BJ26 rectangular waveguide is selected, with a=8.636 cm; b=4.318 cm.

[0021] In addition, the microwave generator can be connected to the straight waveguide through a circulator. A water load is provided on the circulator. The water load has a water inlet and outlet. The water load is connected to a water pump through a water pipe at the inlet of the water load. The water pump is placed in a water tank and water circulation is achieved through negative pressure. The outlet water pipe of the water load is connected to the water inlet of the microwave generator. After cooling the magnetron, the water returns to the water tank through a pipe from the water outlet. The water in the water load is mainly used to absorb reflected microwaves to prevent reflected microwaves from entering the microwave generator from the circulator and damaging the magnetron. In addition, a microwave power meter is installed on the straight waveguide to monitor the incident power and reflected power in real time.

[0022] Furthermore, the size of the cutoff waveguide 4 satisfies the following formula conditions: , in, f c is the cut-off frequency, D and L are the cut-off waveguide diameter and length, and SE is the shielding energy effectiveness.

[0023] The cut-off waveguide 4 can not only cut off the microwaves in the multi-mode cavity to prevent damage to the equipment, but also ensure that the imaging acquisition component can smoothly photograph the rocks in the cavity. The cut-off waveguide 4 is a hollow cylindrical structure.

[0024] The imaging acquisition component is a prior art, which can be a high-speed camera, a camera, a video recorder, or an optical microscope or an electron microscope with a microscope camera. The shooting end 5 of the imaging acquisition component is located at the outer opening of the cutoff waveguide 4. In addition, in order to improve the imaging quality, a fill light can be arranged above the bearing component, and an infrared thermal imager can also be arranged, and the acquisition end of the infrared thermal imager is located above the bearing component.

[0025] The sample of the present invention can be a single rock sample, or a granular rock pile.

[0026] Furthermore, the multi-mode cavity includes an upper concave bottom shell 1 and a lower concave top shell 2, the top of the upper concave bottom shell 1 is detachably connected to the lower concave top shell 2 by bolts, the upper concave bottom shell 1 and the lower concave top shell 2 together form a chamber, a bearing component is arranged between the upper concave bottom shell 1 and the lower concave top shell 2, the bearing component is clamped and fixed between the upper concave bottom shell 1 and the lower concave top shell 2, and the bolts can pass through the bearing component to fix it.

[0027] The load-bearing component of the present invention includes two embodiments: like Figure 3 , Embodiment 1 of the bearing component: the bearing component is a glass plate 3, the glass plate 3 is arranged horizontally, and its upper surface is used to place the sample; The top of the upper concave bottom shell 1 is connected to the vertically arranged cutoff waveguide 4 , and the imaging acquisition component is located above the cutoff waveguide 4 .

[0028] In Example 1, the glass plate 3 can carry more rock samples, so that granular rock samples can be spread flat on the glass plate 3, or carry larger rock samples.

[0029] like Figure 4-Figure 6 , Embodiment 2 of the bearing component: the bearing component comprises a glass shell 21 and a hollow cylinder 22; The glass shell 21 is annular, and the hollow part thereof is provided with the hollow cylinder 22. A first annular chamber is annularly provided inside the glass shell 21, and the first annular chamber is provided around the hollow cylinder 22. A first water inlet pipe 11 and a first drain pipe 10 connected to the first annular chamber are provided on both sides of the glass shell 21. The first water inlet pipe 11 and the first drain pipe 10 are connected to an external cooling circulation component to form flowing circulating water in the first annular chamber.

[0030] Specifically, the outer edges of the top and bottom surfaces of the glass shell 21 abut against the upper end surface of the upper concave bottom shell 1 and the lower end surface of the lower concave top shell 2, respectively. The outer annular surface of the glass shell 21 is provided with an opening of the first annular chamber, and the opening is fixedly connected to the metal ring plate 27 to prevent microwaves from overflowing. The metal ring plate 27 and the first annular chamber form an annular sealed chamber. The first water inlet pipe 11 and the first drain pipe 10 are located on both sides of the glass shell 21.

[0031] The external cooling circulation component is a prior art, including a cooling water tank 7 and a pump body. The first water inlet pipe 11 and the first drain pipe 10 are both connected to the cooling water tank 7 and drive the internal cooling medium to circulate through the pump body. The cooling medium is pure water. A heat exchange pipe can be arranged in the cooling water tank 7, and the heat exchange pipe can be connected to a water storage tank (not shown in the figure). The heat exchange pipe transfers the heat of the cooling medium in the cooling water tank 7 to the water storage tank to form a waste heat recovery effect and cool down the cooling medium. The cooling medium forms circulating water in the cooling water tank 7, the first water inlet pipe 11, the first drain pipe 10 and the first annular chamber.

[0032] In Example 2, since only the microwaves passing through the hollow cylinder 22 have an effect on the sample, the circulating water in the glass shell 21 can absorb the excess microwave energy and convert it into heat to form a waste heat recovery function, and the microwaves can be more concentrated on the test in the hollow cylinder 22. Compared with Example 1, Example 2 is suitable for the case where the rock test size is smaller.

[0033] A supporting glass plate 23 may be fixedly connected inside the hollow tube 22 , and a groove is formed between the supporting glass plate 23 and the top surface of the hollow tube 22 for placing a sample.

[0034] Furthermore, the top of the upper concave bottom shell 1 is detachably connected to a top plate 26, and the top of the top plate 26 is connected to a cover plate 25. A second annular chamber is provided between the cover plate 25 and the top plate 26. The second annular chamber is connected to an external cooling circulation component via a second water inlet pipe 8 and a second drain pipe 9 to form flowing circulating water in the second annular chamber.

[0035] The second annular chamber forms the second energy recovery of the present invention. The microwaves passing upward from the hollow cylinder 22 penetrate the top plate 26 and are absorbed by the circulating water in the second annular chamber. The second water inlet pipe 8 and the second drain pipe 9 are connected to the cooling water tank 7 and the pump body. The cover plate 25 can be provided with an annular groove with an opening facing downward, which cooperates with the top plate 26 to form the second annular chamber.

[0036] Furthermore, the cover plate 25 and the top plate 26 are provided with a through hollow portion, in which the energy absorbing cylinder 12 is slidably provided, the second annular chamber is provided around the energy absorbing cylinder 12, and the energy absorbing cylinder 12 is filled with microwave absorbing filler; the bottom of the energy absorbing cylinder 12 is provided with an opening, and the opening is provided with a thread; the energy absorbing cylinder 12 is coaxially provided with the hollow cylinder 22; The bottom of the hollow cylinder 22 is provided with an annular tooth portion, the bottom of the hollow part of the glass shell 21 is fixedly connected to the supporting gear ring 24, and the annular tooth portion cooperates with the supporting gear ring 24 to form a circumferential constraint; the hollow cylinder 22 is used to move downward and is threadedly connected to the hollow cylinder 22.

[0037] Specifically, the cover plate 25 and the top plate 26 are both annular, and the hollow parts of the two are in clearance with the energy absorbing cylinder 12, and form a certain sliding damping, which eliminates the self-weight effect of the energy absorbing cylinder 12. The energy absorbing cylinder 12 moves only when the energy absorbing cylinder 12 is manually slid. A rubber ring can also be set on the inner wall surface of the hollow part of the cover plate 25 and the top plate 26 to form sliding damping.

[0038] The annular tooth portion and the supporting gear ring 24 are both annular in shape. The supporting gear ring 24 supports the annular tooth portion and the hollow cylinder 22 . Under the cooperation of the annular tooth portion and the supporting gear ring 24 , a circumferential constraint of the hollow cylinder 22 is formed.

[0039] When the hollow cylinder 22 needs to be removed to remove the sample, Figure 5 The energy absorbing cylinder 12 moves downward until it is sleeved on the hollow cylinder 22, and the energy absorbing cylinder 12 is rotated so that the hollow cylinder 22 is threadedly connected to the energy absorbing cylinder 12, and then the energy absorbing cylinder 12 is moved upward so that the energy absorbing cylinder 12 passes through the cover plate 25 and the top plate 26, and the energy absorbing cylinder 12 can be taken out, which facilitates the replacement test.

[0040] In Example 2, the side surface of the upper concave bottom shell 1 is connected to the horizontally arranged cutoff waveguide 4. Compared with Example 1, Example 2 has less influence on the microwave of the imaging collection component.

[0041] Furthermore, a fixing plate 18 and a plane mirror 19 are provided inside the upper concave bottom shell 1, and the plane mirror 19 is tilted to reflect the sample to the imaging acquisition component; The fixing plate 18 is rotatably connected to the upper connecting rod 16 and the lower connecting rod 17 which are arranged horizontally, the upper connecting rod 16 is located above the lower connecting rod 17, the upper connecting rod 16 and the lower connecting rod 17 can slide through the upper concave bottom shell 1, and one end of the upper concave bottom shell 1 is movably connected to the adjusting vertical rod 15, the middle part of the adjusting vertical rod 15 is rotatably connected to one end of the telescopic rod 20, and the other end of the telescopic rod 20 is fixedly connected to the outer side surface of the upper concave bottom shell 1; When the upper connecting rod 16 and the lower connecting rod 17 slide in the same direction, the position of the plane mirror 19 is adjusted. When the upper connecting rod 16 and the lower connecting rod 17 slide in opposite directions, the angle of the plane mirror 19 is adjusted.

[0042] Specifically, the plane mirror 19 can facilitate the imaging acquisition component to collect the sample image. The upper connecting rod 16 and the lower connecting rod 17 are hinged to the fixing plate 18 at one end, and the other ends of the two can be connected to the hinge seat, which can be slidably set on the slide rail, and the slide rail is installed on the adjustment vertical rod 15. When the adjustment vertical rod 15 rotates, the upper connecting rod 16 and the lower connecting rod 17 slide in opposite directions to adjust the angle of the plane mirror 19, and when the horizontally arranged telescopic rod 20 is extended and retracted, the plane mirror 19 moves horizontally to adjust the position. By adjusting the position and angle of the plane mirror 19, it is convenient for the imaging acquisition component to collect images, and images of different positions of the test can be collected.

[0043] In the present invention, the glass plate 3, the glass shell 21, the supporting glass plate 23, the top plate 26 and the hollow cylinder 22 are preferably made of quartz glass. The quartz glass plate is a microwave transparent and high temperature resistant material and will not affect the transmission and distribution of microwaves.

[0044] After the various instruments are connected, the microwave power and time are set to start the test, and the computer records the infrared image and the image taken by the optical microscope during the microwave test. In this process, special attention should be paid to the synchronization of the infrared imaging recording time and the microscope shooting time, so as to analyze the time and temperature of the crack generation.

[0045] The present invention uses a microwave generator to generate microwaves to act on rock samples, causing the rock samples to heat and generate cracks, and uses an imaging acquisition component to photograph the rock samples in real time. It is capable of monitoring and recording the crack evolution of the rock during the microwave action process in real time, observing the development and evolution laws of rock cracks in real time, and quantitatively evaluating the volume expansion of minerals.

[0046] The embodiments described above are only descriptions of the preferred modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations, modifications, and substitutions made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for real-time monitoring of microwave crack evolution, characterized in that: include: Microwave power supply, microwave generator, connecting waveguide, multi-mode cavity, bearing component, cutoff waveguide (4) and imaging acquisition component; The microwave power supply is connected to the microwave generator, and the microwave generator is connected to the multi-mode cavity via the connecting waveguide to emit microwaves into the multi-mode cavity. The bearing component is arranged in the multi-mode cavity, and the bearing component is used to place a sample. The bearing component is permeable to microwaves. The cutoff waveguide (4) is installed on the multi-mode cavity, and the imaging acquisition component is arranged at the outlet of the cutoff waveguide (4). The imaging acquisition component is aimed at the sample to acquire an image of the sample.

2. The device for real-time monitoring of microwave crack evolution according to claim 1, characterized in that: The connecting waveguide comprises a straight waveguide and a curved waveguide connected end to end, the inlet end of the straight waveguide is connected to the microwave generator, and the outlet end (6) of the curved waveguide is connected to the multi-mode cavity; the straight waveguide is a rectangular waveguide, and its dimensions satisfy the following formula conditions: ， Integration gives: ， in, f is the microwave frequency, a is the width of the straight waveguide, b is the height of the straight waveguide, and λ is the microwave wavelength.

3. The device for real-time monitoring of microwave crack evolution according to claim 1, characterized in that: The size of the cutoff waveguide (4) satisfies the following formula conditions: ， in, f c is the cut-off frequency, D and L are the cut-off waveguide diameter and length, and SE is the shielding energy effectiveness.

4. The device for real-time monitoring of microwave crack evolution according to claim 1, characterized in that: The multi-mode cavity comprises an upper concave bottom shell (1) and a lower concave top shell (2); the top of the upper concave bottom shell (1) is detachably connected to the lower concave top shell (2); the upper concave bottom shell (1) and the lower concave top shell (2) together form a chamber; a bearing component is provided between the upper concave bottom shell (1) and the lower concave top shell (2).

5. The device for real-time monitoring of microwave crack evolution according to claim 4, characterized in that: The bearing component is a glass plate (3), the glass plate (3) is arranged horizontally, and the upper surface of the glass plate is used for placing the sample; The top of the upper concave bottom shell (1) is connected to the vertically arranged cut-off waveguide (4), and the imaging acquisition component is located above the cut-off waveguide (4).

6. The device for real-time monitoring of microwave crack evolution according to claim 4, characterized in that: The bearing component comprises a glass shell (21) and a hollow cylinder (22); The glass shell (21) is annular, wherein the hollow portion thereof is provided with the hollow cylinder (22), a first annular chamber is provided in an annular direction inside the glass shell (21), the first annular chamber is provided around the hollow cylinder (22), a first water inlet pipe (11) and a first drain pipe (10) connected to the first annular chamber are provided on both sides of the glass shell (21), the first water inlet pipe (11) and the first drain pipe (10) being connected to an external cooling circulation component, so as to form flowing circulating water in the first annular chamber.

7. The device for real-time monitoring of microwave crack evolution according to claim 6, characterized in that: The top of the upper concave bottom shell (1) is detachably connected to a top plate (26), the top of the top plate (26) is connected to a cover plate (25), a second annular chamber is provided between the cover plate (25) and the top plate (26), the second annular chamber is connected to an external cooling circulation component via a second water inlet pipe (8) and a second water outlet pipe (9), so as to form flowing circulating water in the second annular chamber.

8. The device for real-time monitoring of microwave crack evolution according to claim 7, characterized in that: The cover plate (25) and the top plate (26) are provided with a through hollow portion, in which an energy absorbing cylinder (12) is slidably provided, the second annular chamber is provided around the energy absorbing cylinder (12), and the energy absorbing cylinder (12) is filled with microwave absorbing filler; an opening is provided at the bottom of the energy absorbing cylinder (12), and a thread is provided in the opening; the energy absorbing cylinder (12) and the hollow cylinder (22) are coaxially arranged; The bottom of the hollow cylinder (22) is provided with an annular tooth portion, the bottom of the hollow portion of the glass shell (21) is fixedly connected to a supporting toothed ring (24), and the annular tooth portion cooperates with the supporting toothed ring (24) to form a circumferential constraint; the hollow cylinder (22) is used to move downward and is threadedly connected to the hollow cylinder (22).

9. A device for real-time monitoring of microwave crack evolution according to any one of claims 6 to 8, characterized in that: The side surface of the upper concave bottom shell (1) is connected to the horizontally arranged cutoff waveguide (4).

10. The device for real-time monitoring of microwave crack evolution according to claim 9, characterized in that: A fixing plate (18) and a plane mirror (19) are arranged inside the upper concave bottom shell (1); the plane mirror (19) is arranged at an angle and is used to reflect the sample to the imaging collection component; The fixing plate (18) is rotatably connected to an upper connecting rod (16) and a lower connecting rod (17) which are arranged horizontally, the upper connecting rod (16) being located above the lower connecting rod (17), the upper connecting rod (16) and the lower connecting rod (17) being slidably passed through the upper concave bottom shell (1), and one end of the upper connecting rod (16) and the lower connecting rod (17) passing through the upper concave bottom shell (1) is movably connected to the adjusting vertical rod (15), the middle part of the adjusting vertical rod (15) is rotatably connected to one end of the telescopic rod (20), and the other end of the telescopic rod (20) is fixedly connected to the outer side surface of the upper concave bottom shell (1); When the upper connecting rod (16) and the lower connecting rod (17) slide in the same direction, the position of the plane mirror (19) is adjusted; when the upper connecting rod (16) and the lower connecting rod (17) slide in opposite directions, the angle of the plane mirror (19) is adjusted.

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