Gas-containing coal impact failure experiment device capable of applying vertical load

Abstract

The invention belongs to the technical field of experimental equipment, and relates to a gas-containing coal impact failure experimental device capable of applying a vertical load, which comprises a base, a drop hammer assembly, a sealed cabin body, a through hole, a dowel bar, an annular gas pipe, a gas pressure dynamic simulation assembly, a loading plate, a vertical load applying assembly and an acquisition assembly. According to the invention, the impact load applied by the drop hammer assembly is transmitted to the loading plate through the force transmission rod, and the vertical load applied by the vertical load applying assembly to the loading plate is matched to simulate the composite working condition of the vertical load and the burst impact load of the on-site coal body; the gas pressure dynamic simulation assembly is used for conveying the gas with dynamically changed pressure into the annular gas pipe, so that the real stress condition of the gas-containing coal in the well is simulated; stress and strain data borne by the coal sample, gas pressure data and images of the coal sample from microcrack initiation to macroscopic damage in the impact process are collected in real time through the collecting assembly, and experimental data are comprehensively monitored.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of experimental equipment, and relates to a gas-containing coal impact failure experimental device capable of applying vertical load. BACKGROUND

[0002] With the continuous increase of coal mining depth, coal and gas outburst, rock burst and other dynamic disasters are becoming increasingly serious, which poses a great threat to mine safety production. The mechanical properties and failure characteristics of gas-containing coal under impact load are significantly different from those of ordinary coal. Therefore, it is of great significance to study the failure mechanism of gas-containing coal under the combined action of impact load and vertical load for preventing and controlling coal and gas outburst, rock burst and other dynamic disasters.

[0003] The existing gas-containing coal impact experimental device has many defects. Firstly, the single impact load is provided by the falling hammer impact mode, and the vertical load cannot be superimposed. The stress state of the combined working condition of the vertical load and the sudden impact load of the coal body in the field is significantly different from that of the experimental results, which makes it difficult to reflect the real evolution mechanism of the coal and gas outburst, rock burst and other disasters in the field. Secondly, the static inflation method is often used for gas environment simulation, which is difficult to simulate the dynamic change of gas pressure in the mining process. Thirdly, the data acquisition system is mainly aimed at a single mechanical parameter (such as impact force), and lacks the synchronous acquisition of multi-physical field information such as gas pressure fluctuation, which cannot reveal the multi-field coupling law in the disaster incubation process. SUMMARY

[0004] The purpose of the present application is to provide a gas-containing coal impact failure experimental device capable of applying vertical load, which can simulate the real stress condition of gas-containing coal in the underground, comprehensively monitor the experimental data, and provide a reliable experimental means for studying the impact failure mechanism of gas-containing coal.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the present application is as follows: A gas-containing coal impact failure experimental device capable of applying vertical load, comprising a base, a falling hammer assembly arranged above the base, and further comprising: A sealed cabin arranged on the upper part of the base and located below the falling hammer assembly, a through hole being formed in the upper part of the sealed cabin; A force transmission rod arranged vertically in the through hole and in sliding sealing connection with the through hole, the force transmission rod being used for transmitting the impact load applied by the falling hammer assembly; An annular gas pipe arranged in the sealed cabin, a plurality of gas holes being uniformly formed in the annular gas pipe; A gas pressure dynamic simulation assembly connected with the annular gas pipe and used for conveying gas with dynamic pressure change into the annular gas pipe; A loading plate arranged below the force transmission rod, the loading plate being located in the annular gas pipe, and the upper part of the loading plate being used for placing a coal sample; A vertical load applying assembly is arranged below the loading plate and used to apply a vertical load to the loading plate. A collecting assembly is used to collect stress and strain data of the coal sample, gas pressure data and images of the coal sample from micro-crack initiation to macroscopic failure in real time during the impact process.

[0006] The present application also has the characteristics that: The gas pressure dynamic simulation assembly comprises: A gas conveying member is connected with the outlet of the annular gas pipe and used to send the gas with dynamic pressure change into the annular gas pipe; A mass flow controller is arranged at the outlet of the gas conveying member and used to control the flow of the gas; A recovery member is connected with the outlet of the annular gas pipe through a vacuum pump and used to extract the air in the sealed cabin by the vacuum pump before the experiment, so that the sealed cabin is kept in a vacuum state, and the gas in the annular gas pipe is extracted by the vacuum pump during the experiment, so that the gas pressure in the annular gas pipe is kept in dynamic change.

[0007] The vertical load applying assembly comprises: A hydraulic cylinder is vertically arranged at the lower part of the loading plate, and the two ends of the hydraulic cylinder are connected with the loading plate and the bottom of the sealed cabin respectively; A hydraulic pump station is connected with the hydraulic cylinder and used to control the oil pressure in the hydraulic cylinder, so as to control the vertical load applied to the loading plate by the hydraulic cylinder.

[0008] The collecting assembly comprises: A strain type force sensor is arranged in the loading plate and used to detect the stress value in real time during the impact process; A three-way strain gauge is arranged at the upper part of the loading plate and located around the coal sample and used to detect the strain value in real time during the impact process; A miniature pressure sensor is arranged in the sealed cabin and used to monitor the gas pressure value in real time; An anti-explosion high-speed camera is arranged in the sealed cabin and used to shoot the images of the coal sample from micro-crack initiation to macroscopic failure in real time.

[0009] The drop hammer assembly comprises: A top plate is horizontally arranged above the sealed cabin; Two guide rods are oppositely vertically arranged between the top plate and the sealed cabin, and the two ends of each guide rod are connected with the top plate and the sealed cabin respectively; A drop hammer body is arranged between the two guide rods, and a sleeve is slidably arranged on each guide rod, and the drop hammer body is connected with the two sleeves; A drop hammer head is arranged at the lower part of the drop hammer body; A lifting member is connected with the top plate and the drop hammer body respectively and used to adjust the height of the drop hammer head. The grab-and-release piece is connected with the lifting piece and the impact hammer body respectively, and is used for grabbing and releasing the impact hammer body.

[0010] The lifting piece is an electric hoist or a winch.

[0011] The grab-and-release piece is an electromagnetic chuck or a mechanical grab.

[0012] A limiting groove is formed in the upper part of the loading plate, and the limiting groove is used for placing the coal sample.

[0013] The sealing cabin body is made of stainless steel.

[0014] The gas-containing coal impact failure experiment device capable of applying vertical load has the following advantages: The impact load applied by the drop hammer assembly is transmitted to the loading plate through the force transmission rod, and the vertical load applied to the loading plate by the vertical load applying assembly simulates the combined working condition of the vertical load and the sudden impact load of the coal body in the field, at the same time, the gas with dynamic pressure change is delivered into the annular gas pipe through the gas pressure dynamic simulation assembly, so that the real stress condition of the gas-containing coal in the mine is simulated, the experimental results can reflect the real evolution mechanism of the coal and gas outburst, impact ground pressure and other disasters in the field, in addition, the stress and strain data of the coal sample, the gas pressure data and the image of the coal sample from the microcrack initiation to the macroscopic damage in the impact process are collected in real time through the collection assembly, the experimental data are monitored comprehensively, the complete physical model of disaster evolution is constructed, and reliable experimental means are provided for studying the impact failure mechanism of the gas-containing coal. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0016] Figure 2 It is a schematic diagram of the structure of the vertical load applying assembly in the present application.

[0017] Figure 3 It is a schematic diagram of the structure of the sealing cabin body in the present application.

[0018] Figure 4 It is a schematic diagram of the structure of the force transmission rod in the present application.

[0019] Figure 5 It is a schematic diagram of the structure of the drop hammer assembly in the present application.

[0020] Figure 6 It is a schematic diagram of the structure of the impact hammer head in the present application.

[0021] Reference signs: 1, loading plate, 2, hydraulic cylinder, 3, sleeve, 4, base, 5, air inlet pipe, 6, sealed cabin, 7, first flange, 8, annular gas pipe, 9, air outlet pipe, 10, second flange, 11, top plate, 12, impact hammer body, 13, impact hammer head, 14, guide rod, 15, force transmission rod, 16, through hole. DETAILED DESCRIPTION

[0022] The technical solutions in the application will be described clearly and exhaustively below in combination with the drawings. In the description of the embodiments of the application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B: "and / or" in the text only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist together, and B exists alone, in addition, in the description of the embodiments of the application, "multiple" means two or more than two. The following terms "first" "second" are only for the purpose of description, and cannot be understood as implying or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" "second" can explicitly or implicitly include one or more features.

[0023] As Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the present application provides a vertical load applied gas-containing coal impact failure experimental device, which comprises a base 4, a sealed cabin body 6, a force transmission rod 15, an annular gas pipe 8, a gas pressure dynamic simulation assembly, a loading plate 1, a vertical load applying assembly and a collection assembly, a drop hammer assembly is arranged above the base 4, the sealed cabin body 6 is arranged on the upper part of the base 4, the sealed cabin body 6 is located below the drop hammer assembly, a through hole 16 is formed in the upper part of the sealed cabin body 6, the force transmission rod 15 is vertically arranged in the through hole 16, the force transmission rod 15 is in sliding sealing connection with the through hole 16, the force transmission rod 15 is used for transmitting the impact load applied by the drop hammer assembly, the annular gas pipe 8 is horizontally arranged in the sealed cabin body 6, a plurality of gas holes are uniformly formed in the annular gas pipe 8, the uniformity of the gas pressure around the coal sample is ensured, the gas pressure dynamic simulation assembly is connected with the annular gas pipe 8, the gas pressure dynamic simulation assembly is used for conveying the gas with dynamic pressure change into the annular gas pipe 8, the loading plate 1 is horizontally arranged in the sealed cabin body 6, the loading plate 1 is located below the force transmission rod 15, the loading plate 1 is located in the annular gas pipe 8, the upper part of the loading plate 1 is used for placing the coal sample, the vertical load applying assembly is arranged below the loading plate 1, the vertical load applying assembly is used for applying the vertical load to the loading plate 1, the vertical load applying assembly cooperates with the drop hammer assembly to simulate the combined working condition of the vertical load and the sudden impact load of the coal body in the field, and the collection assembly is used for collecting the stress and strain data of the coal sample, the gas pressure data and the image of the coal sample from the micro crack initiation to the macroscopic failure in the impact process in real time. The impact load applied by the drop hammer assembly is transmitted to the loading plate 1 through the force transmission rod 15, the vertical load applied to the loading plate 1 by the vertical load applying assembly simulates the combined working condition of the vertical load and the sudden impact load of the coal body in the field, at the same time, the gas with dynamic pressure change is conveyed into the annular gas pipe 8 through the gas pressure dynamic simulation assembly, so that the real stress condition of the gas-containing coal in the underground is simulated, the experimental results can reflect the real evolution mechanism of the disasters such as the coal and gas outburst and the rock burst in the field, in addition, the stress and strain data of the coal sample, the gas pressure data and the image of the coal sample from the micro crack initiation to the macroscopic failure in the impact process are collected in real time through the collection assembly, the experimental data is comprehensively monitored, the complete physical model of the disaster evolution is constructed, and thus a reliable experimental method for studying the impact failure mechanism of the gas-containing coal is provided.

[0024] As shown in the figure, Figure 2 A limiting groove is formed in the upper part of the loading plate 1, the limiting groove is used for placing the coal sample, and the coal sample is conveniently constrained through the limiting groove.

[0025] As shown in the figure, Figure 2 The middle part of the side surface of the force transmission rod 15 is a convex structure, the convex structure is located in the lower part of the through hole 16, the diameter of the convex structure is greater than the diameter of the through hole 16, and the loading plate 1 can apply the vertical load to the coal sample first.

[0026] The gas pressure dynamic simulation assembly comprises a gas conveying element, a mass flow controller and a recovery element. The outlet of the gas conveying element is connected with the inlet of the annular gas pipe 8. The gas conveying element is used to send the gas with dynamic pressure change into the annular gas pipe 8. The dynamic change curve (such as step, sinusoidal fluctuation) of the gas pressure can be set through the built-in main control system of the gas conveying element, so as to simulate the fluctuation effect of the gas pressure in the mining process. The mass flow controller is arranged at the outlet of the gas conveying element. The mass flow controller is used to control the flow of the gas. The inlet of the recovery element is connected with the outlet of the annular gas pipe 8 through a vacuum pump. The recovery element is used to extract the air in the sealed cabin body 6 by using the vacuum pump before the experiment, so that the sealed cabin body 6 is kept in a vacuum state. In the experiment process, the gas in the annular gas pipe 8 is extracted by using the vacuum pump, so that the gas pressure in the annular gas pipe 8 is kept in dynamic change. At the same time, after the experiment, the gas in the sealed cabin body 6 is extracted by using the vacuum pump.

[0027] As shown in Figure 3 , the sealed cabin body 6 side near the position of the annular gas pipe 8 is provided with an air inlet pipe 5 and an air outlet pipe 9. The air inlet pipe 5 and the air outlet pipe 9 respectively pass through the sealed cabin body 6 side and communicate with the annular gas pipe 8. The air inlet pipe 5 is connected with the outlet of the gas conveying element. The air outlet pipe 9 is connected with the inlet of the recovery element.

[0028] As shown in Figure 2 , the vertical load applying assembly comprises a hydraulic cylinder 2 and a hydraulic pump station. The hydraulic cylinder 2 is vertically arranged at the lower part of the loading plate 1. The range of the hydraulic cylinder 2 is 0MPa~100MPa, and the accuracy is ±0.5%. The two ends of the hydraulic cylinder 2 are respectively connected with the loading plate 1 and the bottom of the sealed cabin body 6. The hydraulic pump station is connected with the hydraulic cylinder 2. The hydraulic pump station is used to control the oil pressure in the hydraulic cylinder 2, so as to control the vertical load applied by the hydraulic cylinder 2 to the loading plate 1, and simulate the vertical stress of the coal seam at different depths.

[0029] The collecting assembly comprises a strain type force sensor, a three-way strain gauge, a micro pressure sensor and an explosion-proof high-speed camera. The strain type force sensor is arranged in the loading plate 1. The strain type force sensor is used to detect the stress value in the impact process in real time. The range of the strain type force sensor is 0kN~500kN, and the accuracy is 0.2%. The three-way strain gauge is arranged at the upper part of the loading plate 1 and located around the coal sample. The three-way strain gauge is used to detect the strain value in the impact process in real time. The grid length of the three-way strain gauge is 2mm. The micro pressure sensor is arranged in the sealed cabin body 6. The micro pressure sensor is used to monitor the gas pressure value in real time. The response time of the micro pressure sensor is less than 1ms. The gas pressure fluctuation change can be monitored synchronously. The explosion-proof high-speed camera is arranged in the sealed cabin body 6. The explosion-proof high-speed camera is used to shoot the images of the coal sample from the micro crack initiation to the macroscopic damage process in real time. The frame rate of the explosion-proof high-speed camera is 10000fps.

[0030] As shown in Figure 5 ,Figure 6 As shown, the drop hammer assembly includes a top plate 11, two guide rods 14, an impact hammer body 12, an impact hammer head 13, a lifting piece and a grabbing and releasing piece. The top plate 11 is horizontally arranged above the sealed cabin body 6. The two guide rods 14 are arranged vertically between the top plate 11 and the sealed cabin body 6. The two ends of each guide rod 14 are connected with the top plate 11 and the sealed cabin body 6 respectively. The impact hammer body 12 is arranged between the two guide rods 14. A sleeve 3 is slidably arranged on each guide rod 14. The impact hammer body 12 is connected with the two sleeves 3. The impact hammer head 13 is arranged at the lower part of the impact hammer body 12. The impact hammer head 13 is connected with the impact hammer body 12 by screws. The mass of the impact hammer head 13 and the impact hammer body 12 is 50 kg. The drop height is adjustable between 0.5 m and 2 m. The lifting piece is connected with the top plate 11 and the impact hammer body 12 respectively. The lifting piece is used to adjust the height of the impact hammer head 13. The grabbing and releasing piece is connected with the lifting piece and the impact hammer body 12 respectively. The grabbing and releasing piece is used to grab and release the impact hammer body 12. The two guide rods 14 ensure that the impact hammer body 12 keeps vertical movement during the falling process, thereby improving the accuracy of the impact load. In order to adjust the size of the impact load, the mass of the impact hammer body 12, the lifting height and the releasing mode can be changed.

[0031] As shown in Figure 1 , Figure 3 , Figure 5 , the upper part of the sealed cabin body 6 is connected with the two guide rods 14 through a first flange plate 7. The first flange plate 7 has a hole in the middle. A force transmission rod 15 passes through the middle of the first flange plate 7. The lower part of the sealed cabin body 6 is connected with the base 4 through a second flange plate 10.

[0032] Preferably, the lifting piece is an electric hoist or a winch.

[0033] Preferably, the grabbing and releasing piece is an electromagnetic chuck or a mechanical gripper.

[0034] Preferably, the sealed cabin body 6 is made of stainless steel, preferably high-hardness stainless steel, so that the pressure resistance of the sealed cabin body 6 is ≥15 MPa.

[0035] Preferably, the drop hammer assembly cooperates with the vertical load applying assembly to realize any combination loading of 0 J~500 J impact dynamic load and 0 MPa~100 MPa vertical static load, thereby breaking through the limitation of single load simulation of traditional devices.

[0036] Preferably, the gas pressure dynamic simulation assembly can realize real-time adjustment and fluctuation simulation of 0 MPa~15 MPa gas pressure, solve the limitation of static inflation of existing devices, and at the same time, the response time of dynamic gas pressure adjustment is <0.5 s, and the pressure fluctuation amplitude can be controlled within ±0.2 MPa, which can effectively simulate the transient effect of gas pressure in the mining process.

[0037] Embodiment 1 1) The vertical load is applied to the coal sample in the sealed chamber by the hydraulic cylinder 2. φ 50mm x 100mm gas-containing coal sample is placed in the limiting groove, so that the coal sample is in contact with the lower end of the force transmission rod 15, the hydraulic cylinder 2 is controlled to apply a vertical load of 30MPa to the coal sample, and at the same time, the dynamic change of the gas pressure (such as step, sinusoidal fluctuation) is filled, and after 2h of stabilization, the drop hammer assembly is controlled to carry out a 1m drop height (impact energy about 500J) impact experiment.

[0038] 2) Synchronous data acquisition in the experiment: the stress value in the impact process is detected in real time by using a strain force sensor, the strain value in the impact process is detected in real time by using a three-way strain gauge, the gas pressure value is monitored in real time by using a micro pressure sensor, and an explosion-proof high-speed camera is used for real-time shooting of the image of the coal sample from the micro crack initiation to the macroscopic destruction process, wherein the stress peak value at the impact moment reaches 320kN, and the gas pressure fluctuation amplitude is 1.2MPa.

[0039] 3) The shear failure of the coal sample along the pre-prepared crack surface is observed by the explosion-proof high-speed camera, the gas is sprayed out with the fragments to form obvious gas-solid two-phase flow, and the experimental results are consistent with the damage characteristics of the rock burst accident in a certain mine on site, and the consistency is more than 75%.

[0040] The gas-containing coal impact failure experimental device capable of applying a vertical load has other advantages as follows: Firstly, the vertical and impact loadings can be realized simultaneously, the sealed cabin is well sealed, the stress environment of the gas-containing coal underground can be accurately simulated, and the accuracy and reliability of the experimental results are improved.

[0041] Secondly, the stress value, strain value, gas pressure value and image of the coal sample from the micro crack initiation to the macroscopic destruction in the impact process can be collected simultaneously, massive data support is provided for the multi-field coupling mechanism research, and the data dimension is increased by more than 3 times compared with the traditional device.

[0042] It can be understood that the present application is described by some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to the features and embodiments without departing from the spirit and scope of the present application. In addition, the features and embodiments can be modified to adapt to specific conditions and materials under the guidance of the present application without departing from the spirit and scope of the present application. Therefore, the present application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope of protection of the present application.

Claims

1. A gas-containing coal impact destruction test device capable of applying a vertical load, comprising a base (4), a drop hammer assembly being arranged above the base (4), characterized in that: Also includes: A sealed cabin (6) is arranged on the upper portion of the base (4) and is located below the drop hammer assembly, and a through hole (16) is opened on the upper portion of the sealed cabin (6); A force transmission rod (15) is vertically arranged in the through hole (16) and is slidably and sealingly connected to the through hole (16), and the force transmission rod (15) is used to transmit the impact load applied by the drop hammer assembly; An annular gas pipe (8) is arranged in the sealed cabin (6), and a plurality of air holes are evenly opened on the annular gas pipe (8); A gas pressure dynamic simulation component is connected to the annular gas pipe (8) and is used to transport gas with dynamically changing pressure into the annular gas pipe (8); A loading plate (1) is provided below the force transmission rod (15), the loading plate (1) is located in the annular gas pipe (8), and the upper portion of the loading plate (1) is used for placing a coal sample; A vertical load applying assembly is arranged below the loading plate (1) and is used to apply a vertical load to the loading plate (1); The acquisition component is used to collect in real time the stress and strain data of the coal sample during the impact process, the gas pressure data and the images of the coal sample from micro-crack initiation to macro-destruction.

2. The gas-containing coal impact failure test device capable of applying vertical load according to claim 1 is characterized in that: The gas pressure dynamic simulation component includes: A gas conveying member, the outlet of which is connected to the inlet of the annular gas pipe (8), and is used to convey gas with dynamically changing pressure into the annular gas pipe (8); A mass flow controller is provided at the outlet of the gas conveying member to control the flow of the gas; The recovery part has an inlet connected to the outlet of the annular gas pipe (8) through a vacuum pump. The recovery part is used to use the vacuum pump to extract the air in the sealed cabin (6) before the experiment, so that the sealed cabin (6) remains in a vacuum state, and to use the vacuum pump to extract the gas in the annular gas pipe (8) during the experiment, so that the gas pressure in the annular gas pipe (8) remains in a dynamic change.

3. The gas-containing coal impact failure test device capable of applying vertical load according to claim 1, characterized in that: The vertical load applying assembly comprises: A hydraulic cylinder (2) is vertically arranged at the bottom of the loading plate (1), with both ends of the hydraulic cylinder (2) respectively connected to the loading plate (1) and the bottom of the sealed cabin (6); The hydraulic pump station is connected to the hydraulic cylinder (2) and is used to control the oil pressure in the hydraulic cylinder (2) to control the vertical load applied by the hydraulic cylinder (2) to the loading plate (1).

4. The gas-containing coal impact failure test device capable of applying vertical load according to claim 1, characterized in that: The acquisition component includes: A strain-type force sensor is arranged in the loading plate (1) and is used for real-time detection of stress values ​​during the impact process; A three-dimensional strain gauge is arranged on the upper part of the loading plate (1) and located around the coal sample, and is used for real-time detection of the strain value during the impact process; A micro pressure sensor is provided in the sealed cabin (6) and is used to monitor the gas pressure value in real time; An explosion-proof high-speed camera is arranged in the sealed cabin (6) and is used to capture images of the coal sample in real time during the process from micro-crack initiation to macro-destruction.

5. The gas-containing coal impact failure test device capable of applying vertical load according to claim 1, characterized in that: The drop hammer assembly comprises: A top plate (11) is horizontally arranged above the sealed cabin (6); Two guide rods (14) are relatively vertically arranged between the top plate (11) and the sealed cabin (6), and two ends of each guide rod (14) are respectively connected to the top plate (11) and the sealed cabin (6); An impact hammer body (12) is arranged between two guide rods (14), a sleeve (3) is slidably sleeved on each guide rod (14), and the impact hammer body (12) is connected to the two sleeves (3); An impact hammer head (13) is arranged at the lower part of the impact hammer body (12); A lifting member, connected to the top plate (11) and the impact hammer body (12), respectively, for adjusting the height of the impact hammer head (13); The grabbing and releasing member is connected to the lifting member and the impact hammer body (12) respectively, and is used for grabbing and releasing the impact hammer body (12).

6. The gas-containing coal impact failure test device capable of applying vertical load according to claim 5, characterized in that: The lifting member is an electric hoist or a winch.

7. The gas-containing coal impact failure test device capable of applying vertical load according to claim 5, characterized in that: The grabbing and releasing member is an electromagnetic chuck or a mechanical gripper.

8. The gas-containing coal impact failure test device capable of applying vertical load according to claim 1, characterized in that: A limiting groove is provided on the upper portion of the loading plate (1), and the limiting groove is used for placing the coal sample.

9. The gas-containing coal impact failure test device capable of applying vertical load according to claim 1, characterized in that: The sealed cabin (6) is made of stainless steel.

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