Triaxial loaded coal rock isothermal adsorption and desorption CT (Computed Tomography) visual test system

Abstract

The invention discloses a triaxial loaded coal rock isothermal adsorption and desorption CT visual test system, and relates to the technical field of coal rock adsorption and desorption detection, the triaxial loaded coal rock isothermal adsorption and desorption CT visual test system mainly comprises a temperature control system, a gas source system, an automatic data acquisition system and an adsorption and desorption chamber. The adsorption and desorption chamber consists of a sample cylinder and a reference cylinder; the gas source system is used for filling gas into the reference cylinder and the sample cylinder through the gas inlet, meanwhile, the gas pressure in the reference cylinder and the sample cylinder is monitored in real time through the gas pressure sensor, and the reference cylinder is used for measuring gas data and providing a comparison standard for reaction in the sample cylinder; the vacuum system is mainly used for vacuumizing the adsorption and desorption system and the coal rock sample through a rotary vane type vacuum pump, so that the test error is reduced as much as possible. In addition, the sample cylinder carrier is correspondingly provided with a rotating function, so that more sufficient CT scanning data can be obtained, and the experiment accuracy is improved.

Description

Technical Field

[0001] The invention relates to the technical field of coal rock adsorption and desorption detection, and in particular to a triaxially loaded coal rock isothermal adsorption and desorption CT visualization testing system. Background Art

[0002] CT scanning is a non-destructive test and detection technology. In recent years, it has been widely used in the experimental research of the microscopic damage mechanics properties of rocks. It is a very effective means to explore the development and expansion laws of internal or surface cracks during rock failure.

[0003] The temperature of sample adsorption and desorption affects the gas desorption, that is, the temperature is directly proportional to the amount of free gas and inversely proportional to the amount of adsorbed gas. Maintaining the sample temperature at a certain value can effectively provide experimental data for the analysis of the loaded sample.

[0004] The traditional CT scanning operation is to load the loaded sample in stages, and then manually place the loaded sample into the CT scanner and perform repeated operations to approximately achieve the effect of obtaining the stress-strain curve of the entire process of instability and failure of the loaded sample, but it is impossible to obtain real-time CT scanning information on the microscopic three-dimensional crack structure of the loaded sample.

[0005] In the CT triaxial test of loaded coal and rock mass, it is particularly critical to use CT visualization to monitor the temperature of the sample loading and the isothermal adsorption and desorption process in real time. The real-time monitoring of the sample loading directly affects the accuracy of the experimental results. In order to reduce the impact of the temperature change of the coal and rock sample on the experiment, ensure that the characteristics of the coal and rock sample during the isothermal adsorption and desorption process are under the temperature conditions set in the experiment, and monitor the characteristics of the coal and rock sample during the isothermal adsorption and desorption process in real time, there is an urgent need for a test device that can use CT to monitor the characteristics of the loaded sample during the isothermal adsorption and desorption process in real time. Summary of the invention

[0006] The purpose of the present invention is to provide a triaxially loaded coal rock isothermal adsorption and desorption CT visualization testing system to solve the above problems.

[0007] The present invention is achieved through the following technical solutions: A triaxially loaded coal rock isothermal adsorption and desorption CT visualization test system comprises a temperature control system, a gas source system, a CT scanner and an adsorption and desorption chamber, wherein the temperature control system is used to control the temperature of the adsorption and desorption chamber; the gas source system is used to control the internal air pressure of the adsorption and desorption chamber; the CT scanner is arranged in the adsorption and desorption chamber, and is used to scan the coal rock samples in real time; the adsorption and desorption chamber comprises a reference cylinder and a sample cylinder, wherein the CT scanner is arranged in the sample cylinder; the CT scanner comprises a radiation source, a radiation detection sensor and a carrier, wherein the coal rock sample is arranged in the carrier, and the carrier can drive the coal rock sample to rotate; the carrier comprises a first telescopic cylinder, an outer shell, an inner tube assembly, a sliding tube assembly, a rubber sealing sleeve, a support assembly and a rotating cylinder, wherein a hydraulic cavity is between the outer shell and the inner tube, and the rotating cylinder is connected to the hydraulic cavity.

[0008] In general, the temperature control system and the gas source system are used to control the adsorption and desorption conditions of the coal and rock samples in the adsorption and desorption chamber, and the CT scanning device is used to obtain the scanning data of the coal and rock samples under different adsorption and desorption conditions in real time.

[0009] The support assembly includes a first support tube and a second support tube, the sliding assembly includes a first slide tube and a second slide tube, and the inner tube assembly includes a first inner tube and a second inner tube. The sample cylinder corresponding carrier is also provided with a bottom platform and a top platform, wherein the top platform and the bottom platform are respectively provided with a first rotating plate and a second rotating plate, the first rotating plate is provided with a driving assembly, and the carrier is provided between the first rotating plate and the second rotating plate; by providing the carrier between the first rotating plate and the second rotating plate, the carrier can be rotated, thereby enabling the CT scanning device to scan the coal and rock samples in real time at multiple angles to obtain its three-dimensional scanning data.

[0010] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The operation steps of coal rock adsorption and desorption CT scanning in the prior art are generally as follows: load the loaded sample in stages, manually move the sample into the CT scanner after each stage of loading, and repeat this process. Although this method can approximately obtain the stress-strain curve of the loaded sample from loading to instability and failure, it cannot capture the CT scanning information of the microscopic three-dimensional crack structure of the loaded sample in real time; the present invention sets a CT scanning device in the sample cylinder, and controls the adsorption and desorption conditions of the sample cylinder through a temperature control system and a gas source system, so that the CT scanning device in the present invention can scan and observe the coal rock samples under different conditions in real time, and then obtain comprehensive data of the adsorption and desorption of the coal rock samples under different conditions; 2. The three-axis CT scanner in the prior art can only scan coal and rock samples from a single angle, which limits the acquisition of complete three-dimensional structural information. Since the image can only be captured from one direction, it is difficult to fully reflect the complex cracks and fine structures inside the sample; the present invention sets a bottom platform and a top platform, and equips the top platform and the bottom platform with a first rotating plate and a second rotating plate respectively, wherein a driving assembly is installed on the first rotating plate, and the carrier is fixed between the first rotating plate and the second rotating plate, and the rotation of the first rotating plate can drive the carrier to rotate; in addition, the present invention sets a rotating cylinder, sets a plurality of openings on the rotating cylinder, and sets a first liquid injection seal and a second liquid injection seal outside the rotating cylinder, and finally sets a liquid injection tube shell fixed on the bottom platform on the outside, so that the rotating cylinder of the present invention can still be injected with high-pressure fluid from the outside during the rotation process, and the design of connecting the rotating cylinder with the hydraulic cavity enables the present invention to instantly inject high-pressure fluid from the outside into the hydraulic cavity during the rotation process to complete the extrusion of coal rock; the present invention can rotate the carrier and continuously control the pressure of the carrier on the coal rock sample, so as to keep the impact of the carrier on the coal rock sample small during the rotation process, and can also continuously obtain the detection data of coal rock samples at different angles during the rotation process, and compared with the prior art, the present invention effectively improves the integrity and accuracy of CT scanning detection data. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings: Figure 1 This is a schematic diagram of the monitoring system architecture of this embodiment; Figure 2 This is a schematic diagram of the CT scanning system architecture of this embodiment; Figure 3 is a schematic diagram of the vehicle structure; Figure 4 for Figure 3 A schematic diagram of the structure of the medium vehicle from another perspective; Figure 5 for Figure 4 Detailed diagram at A in the middle; Figure 6 This is a schematic diagram of the first cutting of the carrier; Figure 7 This is a schematic diagram of the second cutting of the carrier; Figure 8 This is a schematic diagram of the coordination of components in the middle part of the vehicle.

[0012] The reference numerals represent: 1-water bath, 2-sample cylinder, 3-hydraulic drive pipe assembly, 4-liquid injection pipe, 5-radiation source, 6-carrier, 7-radiation detection sensor, 8-bottom platform, 9-top platform, 10-hydraulic motor, 11-first telescopic cylinder, 12-first support tube, 13-housing, 14-second support tube, 15-liquid injection tube housing, 16-worm gear unit, 17-first slide, 18-first rotating plate, 19-first piston, 20-first annular seal, 21 -Rubber sealing sleeve, 22-second annular sealing member, 23-liquid outlet pipe, 24-first liquid injection sealing member, 25-second liquid injection sealing member, 26-through hole, 27-rotating cylinder, 28-second rotating plate, 29-first foamed aluminum, 30-second foamed aluminum, 31-coal rock sample, 32-first inner tube, 33-second inner tube, 34-first sliding tube, 35-second sliding tube, 36-second sliding vane, 37-gas cylinder, 38-plunger pump, 39-vacuum pump, 40-reference cylinder, 41-data terminal. DETAILED DESCRIPTION

[0013] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0014] like Figure 1 to Figure 2 As shown, this embodiment relates to a triaxially loaded coal rock isothermal adsorption and desorption CT visualization test system, including a temperature control system, a gas source system, a CT scanning device, and an adsorption and desorption chamber (the adsorption and desorption chamber is composed of a sample cylinder 2 and a reference cylinder 40, and the maximum pressure bearing capacity of the sample cylinder 2 is 10 MPa, see Figure 1 , wherein the left side is a reference cylinder 40 and the right side is a sample cylinder 2), wherein the temperature control system includes a water bath 1 and a corresponding warm water injection system, the gas source system includes a vacuum pump 39 and a gas injection system, and the gas injection system includes a gas cylinder 37 and a plunger pump 38.

[0015] The system temperature is controlled by injecting a constant temperature water bath into the water bath 1 through the warm water injection system; the gas source system is filled into the reference cylinder 40 and the sample cylinder 2, and the gas pressure in the reference cylinder 40 and the sample cylinder 2 is monitored in real time through the air pressure sensor; in addition, the adsorption and desorption system and the coal rock sample 31 are evacuated through the rotary vane vacuum pump 39 to minimize the test error. During the isothermal adsorption and desorption experiment, the dry coal rock sample 31 is placed in the sample cylinder 2. The sample cylinder 2 and the reference cylinder 40 are set in the constant temperature water bath 1 to ensure that the temperature of the coal rock sample 31 and its surrounding temperature are the same constant temperature during the adsorption experiment.

[0016] The specific experimental steps of the CT real-time monitoring experiment using the triaxially loaded coal rock isothermal adsorption and desorption CT visualization test system are as follows: Step 1: Check the temperature control system, gas source system and each part of the adsorption and desorption chamber one by one to ensure that there is no damage and the connection is firm. In particular, check whether the sealing of the water bath 1 and the connection of the warm water injection system are firm. Prepare constant temperature water according to the experimental requirements to ensure that the water temperature reaches the required constant temperature, which is usually achieved by heating and constant temperature controller; Step 2: Place the coal rock sample 31 in a drying oven to ensure that its water content is minimized to prevent moisture from affecting the adsorption and desorption process. Check the cleanliness and sealing of the sample cylinder 2 to ensure that there is no residue and the sealing gasket is intact; Step 3: Carefully place the dried coal and rock sample 31 into the sample cylinder 2 to ensure that the sample is evenly distributed. The sample cylinder 2 and the reference cylinder 40 are fixed at designated positions in the constant temperature water bath 1 to ensure that they are completely immersed in the constant temperature water to ensure consistent temperature; Step 4: Connect the vacuum pump 39 to the adsorption and desorption system, and ensure that all pipelines are tightly connected and leak-free. Start the vacuum pump 39 and continue to evacuate until the pressure in the system reaches a preset low vacuum degree (usually a few Pascals). This step can last for several hours to ensure that the air and moisture in the system are completely removed; Step five, prepare the required gas according to the experimental requirements, and ensure that the gas purity meets the experimental standards (the gas can be CH4, H2, CO2). Inflate the reference cylinder 40 and the sample cylinder 2 through the gas injection system, and control the inflation speed and pressure (the gas pressure is 0.5 MPa, 2 MPa, 3.5 MPa, 5 MPa, 6.5 MPa or 8 MPa) to prevent sudden pressure changes from causing damage to the equipment and samples. Use a pressure sensor to monitor the gas pressure in the reference cylinder 40 and the sample cylinder 2 in real time to ensure that it is stable within the preset pressure range; test the adsorption and desorption process of the gas by setting multiple pressure intervals, and obtain the corresponding data; Step 6: Inject constant temperature water into the water bath 1 through the warm water injection system, and start the thermostat to maintain the water temperature in the water bath 1 at a preset value. Check the temperature in the water bath 1 regularly, calibrate it with a precision thermometer, ensure that the temperature fluctuation is less than ±0.1°C, set the temperature of the water bath 1 to the experimental target temperature (35°C, 45°C, 55°C), and keep the temperature consistent throughout the experiment to avoid affecting the desorption law due to temperature differences; Step 7: Keep the sample cylinder 2 and the reference cylinder 40 in the constant temperature water bath 1 for a period of time (usually several hours) to ensure that the coal rock sample 31 is in equilibrium with the ambient temperature. Start the adsorption and desorption experiment, set the experimental time and the number of adsorption and desorption cycles, and the automated system will record the gas pressure changes at each time point; Step 8: Use the CT scanning device and the air pressure sensor to monitor the adsorption and desorption process of the coal rock sample 31 in real time to obtain detailed pressure change data and internal structure images. During the experiment, the air pressure sensor and the CT system will automatically record the pressure changes and CT images to ensure the integrity and accuracy of the data. Regularly check the operating status of the data acquisition system to ensure that there is no data loss or abnormality; Step nine, sort out the pressure data and CT image data collected during the experiment, remove noise and outliers. Use professional software to analyze the data, calculate the adsorption and desorption characteristic parameters of the coal rock sample 31, and draw the adsorption and desorption isotherms. Clean the sample cylinder 2, the reference cylinder 40 and the pipeline system with appropriate solvents to ensure that there is no residue, and repeat the corresponding experiments under different conditions until all experiments under different conditions are completed.

[0017] The detailed steps of the adsorption and desorption experiment are as follows: Adsorption experiment: S1, ensure that the sample cylinder 2 is placed in a constant temperature environment, usually using a constant temperature water bath or a constant temperature box, and the temperature is maintained at a predetermined value (e.g., 25°C). Slowly fill the sample cylinder 2 with high-purity gas (e.g., methane, carbon dioxide, etc.), control the filling speed, and avoid excessive pressure fluctuations. Record the initial gas pressure in the sample cylinder 2 as the baseline data.

[0018] S2, through the data terminal 41, set the sampling frequency (for example, once per minute) and continuously record the changes in the gas pressure in the sample cylinder 2. Ensure the normal operation of the system, monitor the changes in gas pressure, and promptly discover and solve possible abnormal situations. Store the collected data in real time in a computer or database to ensure the safety and integrity of the data.

[0019] S3, according to the experimental design, select the appropriate time point for CT scanning. For example, once at the initial, middle and final stages of adsorption. Ensure that the sample position is fixed to avoid displacement during the scanning process. Set CT scanning parameters (such as resolution, scanning speed, etc.) to ensure image quality. Perform CT scanning to obtain image data of the internal structure of coal rock sample 31. Process and analyze the CT image to observe changes in the internal pore structure of coal rock sample 31.

[0020] Desorption experiment: S4, slowly reduce the gas pressure in the sample cylinder 2, usually using a step-by-step pressure reduction method, and maintain the pressure for a period of time after each pressure reduction to ensure that the coal and rock samples 31 are fully desorbed. The gas pressure in the sample cylinder 2 after each pressure reduction is recorded in real time to ensure that the pressure changes smoothly.

[0021] S5, continue to use the automated data acquisition system to record the changes in gas pressure during the desorption process. Set a fixed time interval (such as every minute) to record the gas pressure to ensure the continuity and accuracy of the data. Perform a preliminary analysis of the collected data to observe the pressure change trend during the desorption process.

[0022] S6, select key time points for CT scanning during the desorption process, such as the stable stage after each depressurization. Place the sample cylinder 2 in the CT scanning device to ensure that the position is fixed. Set the CT scanning parameters to ensure that they are consistent with the scanning parameters during the adsorption process for comparative analysis. Perform CT scanning to obtain image data of the internal structure of the coal rock sample 31. Process the CT images to observe the changes in the internal structure of the coal rock sample 31 during the desorption process, especially the changes in the pore structure.

[0023] After the experimental data of adsorption and desorption are collected, the gas source and vacuum pump 39 are gradually turned off to ensure that the pressure in the system returns to normal pressure. According to the gas pressure change data during the adsorption process, the adsorption isotherm is drawn to analyze the adsorption characteristics of the coal rock sample 31. According to the gas pressure change data during the desorption process, the desorption isotherm is drawn to analyze the desorption characteristics of the coal rock sample 31. Using CT image data, the changes in the internal structure of the coal rock sample 31 during the adsorption and desorption process, especially the evolution of the pore structure, are analyzed. Combined with the gas pressure change data and CT image data, a comprehensive analysis is conducted to study the adsorption and desorption mechanism and influencing factors of the coal rock sample 31.

[0024] In addition, if Figures 3 to 8 The figure shows an implementation example of the carrier 6. The sample cylinder 2 involved in this embodiment example includes a cylinder body, and a CT scanning device is correspondingly arranged in the cylinder body. The CT scanning device includes a radiation source 5, a carrier 6 and a radiation detection sensor 7, wherein the radiation source 5 is arranged toward the radiation detection sensor 7, the carrier 6 is arranged between the radiation source 5 and the radiation detection sensor 7, and the coal rock sample 31 for detection is arranged in the carrier 6. The radiation source 5 irradiates the coal rock sample 31 and penetrates the coal rock sample 31, and irradiates the radiation information carrying the coal rock sample 31 into the radiation detection sensor 7, so that the radiation detection sensor 7 obtains the coal rock information.

[0025] Further, the corresponding carrier 6 of the embodiment is further provided with a positioning assembly, wherein the positioning assembly includes a bottom platform 8 and a top platform 9, the carrier 6 is arranged between the bottom platform 8 and the top platform 9, the bottom platform 8 and the top platform 9 are respectively provided with a second rotating plate 28 and a first rotating plate 18, and a second slide 36 is arranged between the bottom platform 8 and the second rotating plate 28, a first slide 17 is arranged between the top platform 9 and the first rotating plate 18, and the second rotating plate 28 and the first rotating plate 18 are respectively rotatably arranged on the corresponding bottom platform 8 or the top platform 9 through the second slide 36 and the first slide 17. The upper and lower ends of the carrier 6 arranged between the bottom platform 8 and the top platform 9 are respectively frictionally abutted on the first rotating plate 18 and the second rotating plate 28, and the carrier 6 can be rotated through the first rotating plate 18 and the second rotating plate 28. In addition, a worm wheel is sleeved on the edge of the first rotating plate 18, and a worm is coupled to the worm wheel (the worm wheel and the worm together constitute a worm gear unit 16), and the worm is connected to a hydraulic motor 10. The hydraulic motor 10 is driven by a hydraulic drive pipe assembly 3 (the hydraulic drive pipe assembly 3 includes liquid inlet and liquid outlet pipelines). The hydraulic motor 10 is fixed on the top platform 9. The hydraulic motor 10 can drive the first rotating plate 18 to rotate. The first rotating plate 18 rotates, and then drives the carrier 6 to rotate through static friction.

[0026] A first telescopic cylinder 11 is vertically arranged at the vertical upper end of the carrier 6, and a first piston 19 facing vertically downward is correspondingly arranged at the first telescopic cylinder 11. A first support tube 12 is also abutted against the lower end of the first piston 19, and a first annular seal 20 is also abutted against the lower end of the first support tube 12. A tubular outer shell 13 is also sleeved on the circumferential outer side of the first annular seal 20, and a first inner tube 32 is sleeved on the circumferential inner side thereof, a first sliding tube 34 is also slidably arranged on the circumferential inner side of the first inner tube 32, and the first sliding tube 34 can slide in the first inner tube 32, a second annular seal 22 is also sleeved on the circumferential inner side of the lower end of the outer shell 13, and a second inner tube 33 is also sleeved on the circumferential inner side of the second annular seal 22, a second sliding tube 35 is also slidably arranged inside the second inner tube 33, and the second sliding tube 35 can slide in the second inner tube 33.

[0027] It is worth noting that the first sliding tube 34 and the second sliding tube 35 have the same inner diameter and are connected by a coaxial tubular rubber sealing sleeve 21. During the experiment, the coal rock sample 31 is installed in the rubber sealing sleeve 21. The first sliding tube 34 and the second sliding tube 35 are used to squeeze the coal rock sample 31. The upper end of the first sliding tube 34 abuts against the first piston 19. Furthermore, the lower end of the second annular seal 22 abuts against the second support tube 14, the lower end of the second support tube 14 abuts against the rotating cylinder 27, and the lower end of the second sliding tube 35 also abuts against the rotating cylinder 27. It is worth noting that the chamber between the outer shell 13 and the first inner tube 32 is a hydraulic chamber for three-dimensional extrusion of coal and rock, and the injection pipe 23 provided in the hydraulic chamber passes through the second annular seal 22 and is connected to the rotating cylinder 27. The rotating cylinder 27 is provided with a plurality of through holes 26 on the same axial segment circumference. The first liquid injection seal 24 and the second liquid injection seal 25 are respectively sleeved on the upper and lower ends of the through hole 26 on the outer side of the circumference 27, both of which are annular seals. A liquid injection tube shell 15 is rotatably arranged on the outer side of the circumference of the first liquid injection seal 24 and the second liquid injection seal 25. The liquid injection tube shell 15 is fixed on the bottom platform 8 and is connected to the liquid injection tube 4 and the liquid outlet pipe 23. The rotating cylinder 27 can rotate relative to the liquid injection tube shell 15, and the bottom end of the rotating cylinder 27 abuts on the second rotating plate 28.

[0028] In addition, it is worth mentioning that the first support tube 12 and the second support tube 14 form a support assembly, the first sliding tube 34 and the second sliding tube 35 form a sliding assembly, and the first inner tube 32 and the second inner tube 33 form an inner tube assembly, and the first inner tube 32 and the second inner tube 33 are respectively provided with a first foam aluminum 29 and a second foam aluminum 30 (metal with multiple micropores that can penetrate gas and is used to simulate the flow of gas in rock formations), and the first support tube 12 and the second support tube 14 are both provided with multiple openings, and the first inner tube 32 and the second inner tube 33 of the corresponding axial segments are also provided with multiple openings connected to the outside. This design enables the coal rock sample 31 to contact the gas filled in the sample cylinder 2, and the contact process is similar to the process of multi-porous contact in the rock formation. The highly similar simulation makes the adsorption / analysis process of the coal rock sample 31 closer to the real environment, thereby improving the accuracy of the experiment. In the process of the experiment, the first telescopic cylinder 11 squeezes the coal rock sample 31 in the axial direction, and at the same time, by injecting high-pressure fluid into the hydraulic chamber, the high-pressure fluid can apply high pressure to the circumference of the coal rock sample 31 through the rubber sealing sleeve 21, so that the coal rock sample 31 can withstand three-dimensional pressure in the carrier 6, simulating the pressure environment of the coal rock sample 31 in the rock formation, and further improving the actual situation of adsorption / analysis of the coal rock sample 31 in the rock formation. In addition, the corresponding rotation design of the carrier 6 enables the CT to scan the changes of the coal rock sample 31 in the circumference in real time, and obtain comprehensive detection data of the coal rock sample 31 under different conditions.

[0029] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A triaxially loaded coal rock isothermal adsorption and desorption CT visualization test system, comprising a temperature control system, a gas source system, a CT scanner and an adsorption and desorption chamber, characterized in that: The temperature control system is used to control the temperature of the adsorption and desorption chamber; the gas source system is used to control the gas pressure inside the adsorption and desorption chamber; the CT scanner is arranged in the adsorption and desorption chamber, and is used to scan the coal and rock samples in real time (31); The adsorption and desorption chamber comprises a reference cylinder (40) and a sample cylinder (2), wherein the CT scanner is arranged in the sample cylinder (2); The CT scanner comprises a radiation source (5), a radiation detection sensor (7) and a carrier (6), wherein a coal rock sample (31) is arranged in the carrier (6), and the carrier (6) is capable of driving the coal rock sample (31) to rotate; The carrier (6) comprises a first telescopic cylinder (11), an outer shell (13), an inner tube assembly, a sliding tube assembly, a rubber sealing sleeve (21), a support assembly, and a rotating cylinder (27), wherein a hydraulic chamber is provided between the outer shell (13) and the inner tube assembly, and the rotating cylinder (27) is connected to the hydraulic chamber.

2. The triaxially loaded coal rock isothermal adsorption and desorption CT visualization test system according to claim 1, characterized in that: The support assembly comprises a first support tube (12) and a second support tube (14), the sliding assembly comprises a first sliding tube (34) and a second sliding tube (35), and the inner tube assembly comprises a first inner tube (32) and a second inner tube (33).

3. The triaxially loaded coal rock isothermal adsorption and desorption CT visualization test system according to claim 1, characterized in that: The sample cylinder (2) is further provided with a bottom platform (8) and a top platform (9) corresponding to the carrier (6), wherein the top platform (9) and the bottom platform (8) are respectively provided with a first rotating plate (18) and a second rotating plate (28), the first rotating plate (18) is provided with a driving component, and the carrier (6) is arranged between the first rotating plate (18) and the second rotating plate (28).

4. The triaxially loaded coal rock isothermal adsorption and desorption CT visualization test system according to claim 1, characterized in that: A plurality of through holes (26) are arranged on the circumference of the same shaft section of the rotating cylinder (27), and a first liquid injection seal (24) and a second liquid injection seal (25) are respectively sleeved on the outer circumference of the rotating cylinder (27) at the upper and lower ends of the through holes (26), and a liquid injection tube shell (15) is rotatably connected to the outer circumference of the first liquid injection seal (24) and the second liquid injection seal (25), and the liquid injection tube shell (15) is fixed on the bottom platform (8).

5. The triaxially loaded coal rock isothermal adsorption and desorption CT visualization test system according to claim 1, characterized in that: The sliding assembly comprises a first sliding tube (34) and a second sliding tube (35), wherein metal fillers with micropores are arranged inside the first sliding tube (34) and the second sliding tube (35).

6. The triaxially loaded coal rock isothermal adsorption and desorption CT visualization test system according to claim 2, characterized in that: A first telescopic cylinder (11) is arranged at the vertical upper end of the carrier (6). A first piston (19) is arranged vertically downward on the first telescopic cylinder (11). A first support tube (12) is arranged at the lower end of the first piston (19). A first annular seal (20) is also abutted against the lower end of the first support tube (12). A tubular outer shell (13) is sleeved on the outer circumference of the first annular seal (20). A first inner tube (32) is sleeved on the inner circumference of the first annular seal. A first slide tube (34) is slidably arranged on the inner circumference of the first inner tube (32). The first slide tube (34) can slide in the first inner tube (32). A second annular seal (22) is sleeved on the inner circumference of the lower end of the outer shell (13). A second inner tube (33) is sleeved on the inner circumference of the second annular seal (22). A second slide tube (35) is slidably arranged inside the second inner tube (33). The second slide tube (35) can slide in the second inner tube (33).

7. The triaxially loaded coal rock isothermal adsorption and desorption CT visualization test system according to claim 6, characterized in that: The first support tube (12) and the second support tube (14) are both provided with a plurality of openings, and the first inner tube (32) and the second inner tube (33) of the corresponding shaft sections are also provided with a plurality of openings connected to the outside.

Images