Coal petrography testing device

Abstract

The present disclosure relates to a coal rock testing device, comprising: a triaxial chamber, an accommodation cavity is formed inside for accommodating a coal rock sample; a pressurizing assembly, one end of which extends into the triaxial chamber, for pressurizing the coal rock sample; a liquid supply assembly, which communicates with the accommodation cavity and injects a salt solution into the accommodation cavity, enabling the salt solution to contact the coal rock sample; and a detection assembly, one end of which extends into the triaxial chamber, capable of acquiring image information and position information of the coal rock sample. The pressurizing assembly, the liquid supply assembly and the detection assembly are connected in the triaxial chamber to simulate the underground environment, test the pressure condition of the coal rock sample in different salt solution environments, and monitor the displacement and damage of the coal rock sample under corresponding conditions to study and evaluate the acquired data, so as to improve the safety and stability of the coal mine underground reservoir operation according to the simulation data.

Description

Technical Field

[0001] This disclosure relates to the field of coal mine safety technology, and more specifically, to a coal and rock testing device. Background Technology

[0002] Some coal mines are exposed to high concentrations of brine for extended periods. If underground reservoirs are to be constructed in such terrain, the coal pillar dams will inevitably be eroded and softened by the high-concentration brine. Furthermore, high-intensity mining will further alter mining-induced stress, exacerbating the complexity of the environment surrounding the coal pillar dams. Therefore, coal pillar dams are actually subjected to a complex multi-field coupling of stress, seepage, and chemistry. Current experimental methods often involve triaxial chamber testing of coal and rock. However, the confining pressure applied in triaxial experiments is typically applied using compressed air, whose properties differ significantly from concentrated brine. This makes it impossible to conduct coupled studies of concentrated brine infiltration, chemical corrosion, and stress, and consequently, to simulate the actual working conditions of coal pillar dams in the field. Moreover, triaxial experiments only allow direct observation of the coal and rock surface from a single external location, making it impossible to determine the displacement of the coal and rock surface due to pressure, and also difficult to accurately assess the surface damage. Summary of the Invention

[0003] The purpose of this disclosure is to provide a coal and rock testing device to simulate the actual environment of a coal mine, in order to study the deformation and damage characteristics of coal and rock under salt water immersion, thereby improving safety in such operating scenarios.

[0004] To achieve the above objectives, this disclosure provides a coal and rock testing device, comprising: The triaxial chamber has an internal cavity for accommodating coal and rock samples. The pressurization assembly has one end inserted into the triaxial chamber and is used to pressurize the coal and rock sample. The liquid supply assembly, connected to the receiving cavity and injecting salt solution into the receiving cavity, enables the salt solution to contact the coal and rock sample; and The detection component extends into the triaxial chamber at one end, enabling it to acquire image and location information of the coal and rock sample.

[0005] Optionally, the pressurizing assembly includes two opposing pressurizing members, with the coal and rock sample placed between the two pressurizing members, and the two pressurizing members can press the coal and rock sample tightly from both sides.

[0006] Optionally, the side of the pressure member closest to the coal and rock sample includes a detachable pressure head, and the cross-section of the pressure head is one of rectangular, cross-shaped, L-shaped, and T-shaped.

[0007] Optionally, the liquid supply assembly includes: The liquid supply circuit is connected to the receiving cavity; A circulating pump, installed on the liquid supply circuit and connected to the outside, is used to supply or drain liquid from the liquid supply circuit; and The feeding section, connected to the liquid supply circuit, can provide solute to the liquid supply circuit to vary the concentration and composition of the salt solution in the liquid supply circuit.

[0008] Optionally, the liquid supply circuit further includes a mixing chamber, and the feeding section is connected to the mixing chamber.

[0009] Optionally, the fluid supply assembly further includes a hydraulic monitoring element connected to the receiving cavity, the hydraulic monitoring element being used to acquire pressure information of the receiving cavity.

[0010] Optionally, the detection component includes: An image acquisition element is used to acquire image information of the coal and rock sample; A displacement detection element is used to contact the coal and rock sample and acquire the position information of the coal and rock sample; and A robotic arm extends into the receiving cavity through the side wall of the triaxial chamber and is connected to the image acquisition element and the displacement detection element, respectively, for controlling the movement of the image acquisition element and the displacement detection element.

[0011] Optionally, the image acquisition element includes: Two opposing ultrasonic testing elements, spaced apart on either side of the pressurization assembly, are used to acquire internal image information of the coal and rock sample; and An imaging element is disposed on the side of the coal and rock sample away from the displacement detection element, for acquiring image information of the surface of the coal and rock sample.

[0012] Optionally, the sidewalls of the triaxial chamber are made of a transparent material.

[0013] Optionally, the coal and rock testing device further includes a control module, which is connected to the pressurization component, the liquid supply component, and the detection component.

[0014] The above technical solution connects a pressurization component, a liquid supply component, and a detection component in a triaxial chamber to simulate the underground environment, test the pressure conditions of coal and rock samples in different salt solution environments, and monitor the displacement and damage of coal and rock samples under corresponding conditions. The acquired data is then studied and evaluated, and operational improvements are made based on the simulation data to enhance the safety and stability of underground water reservoir operations in coal mines.

[0015] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a coal and rock testing apparatus according to one embodiment of the present disclosure.

[0017] Explanation of reference numerals in the attached figures 1-Triaxial chamber; 10-Receiving cavity; 11-Reserved channel for robotic arm; 12-Circular hoop; 13-Sealing ring; 2-Pressurization assembly; 21-Pressurization component; 211-Pressure head; 3-Liquid supply assembly; 31-Liquid supply circuit; 311-Mixing chamber; 32-Circulating pump; 33-Feeding section; 34-Hydraulic monitoring element; 35-Micro flow meter; 36-Hydraulic control unit; 4-Detection assembly; 40-Robotic arm; 411-Ultrasonic detection element; 412-Imaging element; 42-Displacement detection element; 5-Control module; 51-Control center; 52-Workstation; 53-Data cable; 6-Coal and rock sample. Detailed Implementation

[0018] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0019] In this disclosure, unless otherwise stated, directional terms such as "upper" and "lower" are defined for the actual arrangement direction of the coal and rock testing device during use, and directional terms such as "inner" and "outer" are defined for the outline of the corresponding components. The terms "first," "second," etc., are used to distinguish different components and do not indicate sequence or importance. Furthermore, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements.

[0020] According to one embodiment of this disclosure, such as Figure 1 As shown, a coal and rock testing device is provided, which may include a triaxial chamber 1, a pressurizing component 2, a liquid supply component 3, and a detection component 4. The triaxial chamber 1 has a receiving cavity 10 formed inside to accommodate a coal and rock sample 6. One end of the pressurizing component 2 extends into the triaxial chamber 1 to pressurize the coal and rock sample 6. The liquid supply component 3 can communicate with the receiving cavity 10 and inject a salt solution into the receiving cavity 10, enabling the salt solution to contact the coal and rock sample 6. One end of the detection component 4 extends into the triaxial chamber 1 and can acquire image information and position information of the coal and rock sample 6. Here, the salt solution can be a sodium chloride solution, or a magnesium chloride solution, calcium sulfate solution, or other salt solutions or multi-component mixed solutions; this disclosure does not limit the specific type of solution.

[0021] Through the above technical solution, a pressurization component 2, a liquid supply component 3, and a detection component 4 are connected in a triaxial chamber 1 to simulate the underground environment, test the pressure conditions of coal and rock sample 6 in different salt solution environments, and monitor the displacement and damage of coal and rock sample 6 under corresponding conditions. The acquired data is then studied and evaluated, and operational improvements are made based on the simulation data to enhance the safety and stability of underground water reservoir operations in coal mines.

[0022] It should be noted that the coal and rock testing device may also include a control module 5, which can be connected to the pressurization component 2, the liquid supply component 3, and the detection component 4. The control module 5 may include a control center 51, a workstation 52, and data lines 53. The control center 51 and workstation 52 are connected, and multiple data lines 53 are connected to the workstation 52, which are electrically connected to the pressurization component 2, the liquid supply component 3, and the detection component 4. This data line 53 transmits data from the pressurization component 2, the liquid supply component 3, and the detection component 4 to the workstation 52 for data aggregation and analysis. It also transmits commands from the control center 51 to each component, allowing the control center 51 to operate and adjust the pressurization component 2, the liquid supply component 3, and the detection component 4 based on the acquired data.

[0023] Furthermore, such as Figure 1 As shown, the pressurizing assembly 2 may include two opposing pressurizing members 21, with the coal and rock sample 6 placed between the two pressurizing members 21. The two pressurizing members 21 can press the coal and rock sample 6 from both sides to apply different pressures to the coal and rock sample 6 according to the test requirements. A sealing ring 13 may also be fitted at the position of the pressurizing member 21 that contacts the side wall of the triaxial chamber 1 to prevent the liquid added in the triaxial chamber 1 from overflowing. In addition, the side of the pressurizing member 21 near the coal and rock sample 6 may also include a detachable pressure head 211. The pressure head 211 can be replaced with different shapes to apply pressure to irregularly shaped coal and rock when the coal and rock sample 6 is in the shape of a simulated corner, in conjunction with the pressurizing member 21 to improve the accuracy of the test results. Specifically, depending on the shape of the corner coal and rock, the cross section of the pressure head 211 can be one of rectangular, cross-shaped, L-shaped, and T-shaped, which is not limited in this disclosure.

[0024] According to one embodiment of this disclosure, such as Figure 1As shown, the liquid supply assembly 3 may include a liquid supply circuit 31, a circulation pump 32, and a feeding section 33. The liquid supply circuit 31 may be connected to the receiving cavity 10. The circulation pump 32 may be installed on the liquid supply circuit 31 and connected to the outside, used for supplying or draining liquid from the liquid supply circuit 31. The feeding section 33 may be connected to the liquid supply circuit 31 and can provide solute to the liquid supply circuit 31 to change the concentration and composition of the salt solution in the liquid supply circuit 31. The solute or concentrated solution enters the liquid supply circuit 31 through the feeding section 33 and mixes with the existing salt solution, ultimately increasing the concentration of the salt solution in the triaxial chamber 1. The composition of the newly added solute may be the same as or different from the composition of the existing salt solution in the liquid supply circuit 31; this disclosure does not limit this. The circulation pump 32 is connected to the outside. When it is necessary to increase the hydraulic pressure or water level of the triaxial chamber 1, it can supply liquid to the liquid supply circuit 31; when it is necessary to decrease the hydraulic pressure or water level of the triaxial chamber 1, it can extract liquid from the liquid supply circuit 31 for drainage. When it is necessary to reduce the concentration of the salt solution in the supply circuit 31, a portion of the liquid can be first extracted for drainage, and then water can be introduced into the supply circuit 31 to dilute the concentration of the salt solution in the triaxial chamber 1. In this way, the supply component 3 can be fed through the feeding section 33, and the circulating pump 32 can supply or drain liquid to change the concentration and composition of the salt solution in the supply circuit 31, as well as the water level and hydraulic pressure in the triaxial chamber 1. This simulates scenarios of coal and rock under different chemical conditions, thereby increasing the diversity of data samples, enabling more accurate research and evaluation, and ultimately improving the effectiveness of operational improvements based on simulation data.

[0025] Furthermore, such as Figure 1As shown, the liquid supply circuit 31 also includes a mixing chamber 311, and the feeding section 33 is connected to the mixing chamber 311. The mixing chamber 311 can be configured to be openable and closable. Both ends of the mixing chamber 311 are connected to the pipelines on the liquid supply circuit 31. When feeding is required, the outlet end of the mixing chamber 311 is closed, and the inlet end receives the liquid introduced into the mixing chamber 311 by the pipelines on the liquid supply circuit 31. According to the mixing requirements, after a sufficient amount of liquid has been introduced, the inlet end is closed. At this time, the feeding section 33 feeds the mixing chamber 311, and after the newly added solute or concentrated solution is fully mixed with the liquid in the mixing chamber 311, the inlet end and outlet end of the mixing chamber 311 are opened, and the mixing chamber 311 is connected to other pipelines on the liquid supply circuit 31, so as to mix the solution after feeding and mixing with the solution in the triaxial chamber 1, so as to change the concentration and composition of the salt solution in the triaxial chamber 1. Mixing the solution in mixing chamber 311 before it enters triaxial chamber 1 for further mixing with the existing salt solution ensures a more homogeneous mixture. This reduces the risk of added solute clumping, which could lead to the target components and concentrations not meeting the experimental requirements, thus affecting the experimental results. Mixing chamber 311 can also be electrically connected to control module 5, which controls the opening and closing of mixing chamber 311. A stirring structure can also be installed in mixing chamber 311, and control module 5 can control the start and stop of the stirring structure; this disclosure does not limit the scope of the invention.

[0026] Furthermore, such as Figure 1 As shown, the fluid supply assembly 3 may also include a hydraulic monitoring element 34 connected to the receiving cavity 10. The hydraulic monitoring element 34 is used to acquire pressure information of the receiving cavity 10 to monitor the hydraulic pressure in the triaxial chamber 1. The hydraulic monitoring element 34 can be a hydraulic gauge. The hydraulic monitoring element 34 can be connected to the workstation 52 via a data cable 53. The fluid supply assembly 3 may also include a hydraulic control unit 36. The hydraulic control unit 36 ​​can be electrically connected to the workstation 52 via the data cable 53. After the hydraulic monitoring element 34 acquires the pressure information of the receiving cavity 10, it transmits the data to the workstation 52. After analyzing the data, the operator at the workstation 52 determines whether hydraulic control is required. When control is required, the control center 51 transmits a signal to the workstation 52. The workstation 52 then transmits the command signal from the control center 51 to the hydraulic control unit 36 ​​to control the hydraulic pressure in the triaxial chamber 1. When control is required, the signal can also be transmitted to the circulation pump 32, which controls the fluid supply or discharge to complete the hydraulic pressure regulation. This disclosure does not limit this aspect. The hydraulic monitoring element 34 can be connected to the receiving cavity 10 through a pipe, and a micro flow meter 35 can also be connected to the pipe to record the mass of the salt solution that has seeped into the coal and rock sample 6 under temperature and pressure conditions.

[0027] According to one embodiment of this disclosure, such as Figure 1As shown, the detection component 4 may include an image acquisition element, a displacement detection element 42, and a robotic arm 40. The image acquisition element is used to acquire image information of the coal and rock sample 6, and the displacement detection element 42 is used to contact the coal and rock sample 6 and acquire its position information. The displacement detection element 42 can be a displacement gauge, which may be equipped with multiple probes to contact the coal and rock sample 6. The robotic arm 40 can pass through the side wall of the triaxial chamber 1 and extend into the receiving cavity 10, and is connected to both the image acquisition element and the displacement detection element 42 for controlling their movement. By moving the image acquisition element through the robotic arm 40, the morphological changes of the coal and rock sample 6 are monitored. The control center 51 and workstation 52 process the signals to acquire the morphological changes of various parts of the coal and rock sample 6 under corresponding salt solution concentrations, compositions, pressures, and pressure conditions. The robotic arm 40 moves the displacement detection element 42 to monitor the surface deformation of the coal and rock sample 6. The control module 5 processes the signals to acquire the deformation characteristics of various parts of the coal and rock sample 6 under corresponding salt solution concentration, composition, pressure, and compressive conditions, such as whether the coal and rock sample 6 is misaligned and the depth of cracks when they form. Here, the robotic arm 40 can be connected to the control module 5; specifically, it can be connected to the workstation 52 via a data cable 53. The robotic arm 40 also moves the image acquisition element to acquire image information of the coal and rock sample 6. Furthermore, such as Figure 1 As shown, the image acquisition element may include an ultrasonic detection element 411 and an imaging element 412. Two opposing ultrasonic detection elements 411 are spaced apart on both sides of the pressurization assembly 2 to acquire image information of the interior of the coal and rock sample 6. The imaging element 412 is located on the side of the coal and rock sample 6 furthest from the displacement detection element 42 to acquire image information of the surface of the coal and rock sample 6. Here, the ultrasonic detection element 411 can be an ultrasonic probe, and the imaging element 412 can be a scanner, camera, or webcam; this disclosure does not limit this. The ultrasonic detection element 411 can generate ultrasonic waves on the coal and rock sample 6, and the signal is processed by the control module 5 to reflect the internal damage of the coal and rock sample 6. The imaging element 412 can directly scan and photograph the surface of the coal and rock sample 6, and the signal is processed by the control module 5 to reflect the morphological changes of the surface damage of the coal and rock sample 6.

[0028] In addition, the sidewalls of the triaxial chamber 1 can be made of transparent material, allowing a direct view of the interior of the triaxial chamber 1. This facilitates timely detection and handling of problems with the internal structure of the triaxial chamber 1, such as sealing issues caused by high liquid pressure or cracks appearing on the inner sidewalls of the triaxial chamber 1. Multiple circumferential clamps 12 can be fitted onto the outer side of the triaxial chamber 1 to improve its sealing performance. Furthermore, multiple pre-drilled channels 11 for robotic arms can be provided on the triaxial chamber 1 to allow the addition of a robotic arm 40 when a detection component 4 needs to be added.

[0029] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0030] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0031] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A coal and rock testing device, characterized in that, include: The triaxial chamber has an internal cavity for accommodating coal and rock samples. The pressurization assembly has one end inserted into the triaxial chamber and is used to pressurize the coal and rock sample. The liquid supply assembly is connected to the receiving cavity and injects salt solution into the receiving cavity, enabling the salt solution to contact the coal and rock sample; and The detection component extends into the triaxial chamber at one end, enabling it to acquire image and location information of the coal and rock sample.

2. The coal and rock testing device according to claim 1, characterized in that, The pressurizing assembly includes two opposing pressurizing members, with the coal and rock sample placed between the two pressurizing members, and the two pressurizing members can press the coal and rock sample tightly from both sides.

3. The coal and rock testing device according to claim 2, characterized in that, The side of the pressure member closest to the coal and rock sample includes a detachable pressure head, and the cross-section of the pressure head is one of rectangular, cross-shaped, L-shaped, and T-shaped.

4. The coal and rock testing device according to claim 1, characterized in that, The liquid supply assembly includes: The liquid supply circuit is connected to the receiving cavity; A circulating pump, installed on the liquid supply circuit and connected to the outside, is used to supply or drain liquid from the liquid supply circuit; and The feeding section, connected to the liquid supply circuit, can provide solute to the liquid supply circuit to vary the concentration and composition of the salt solution in the liquid supply circuit.

5. The coal and rock testing device according to claim 4, characterized in that, The liquid supply circuit also includes a mixing chamber, and the feeding section is connected to the mixing chamber.

6. The coal and rock testing device according to claim 1, characterized in that, The fluid supply assembly also includes a hydraulic monitoring element connected to the receiving cavity, the hydraulic monitoring element being used to acquire pressure information of the receiving cavity.

7. The coal and rock testing device according to claim 1, characterized in that, The detection component includes: An image acquisition element is used to acquire image information of the coal and rock sample; A displacement detection element is used to contact the coal and rock sample and acquire the position information of the coal and rock sample; and A robotic arm extends into the receiving cavity through the side wall of the triaxial chamber and is connected to the image acquisition element and the displacement detection element, respectively, for controlling the movement of the image acquisition element and the displacement detection element.

8. The coal and rock testing device according to claim 7, characterized in that, The image acquisition element includes: Two opposing ultrasonic testing elements, spaced apart on either side of the pressurization assembly, are used to acquire internal image information of the coal and rock sample; and An imaging element is disposed on the side of the coal and rock sample away from the displacement detection element, for acquiring image information of the surface of the coal and rock sample.

9. The coal and rock testing device according to claim 1, characterized in that, The side walls of the triaxial chamber are made of transparent material.

10. The coal and rock testing apparatus according to any one of claims 1-9, characterized in that, The coal and rock testing device also includes a control module, which is connected to the pressurization component, the liquid supply component and the detection component respectively.

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