Coal rock mass sample gas-containing mechanical loading test device

Abstract

The utility model discloses a coal rock mass sample gas-containing mechanical loading test device which comprises a shell, a loading main body and a loading machine, the loading main body comprises a fixed frame and four pressing plates, the four pressing plates are arranged in a rectangular shape to define a loading space, a coal rock mass sample is placed in the loading space, four strip-shaped clamping grooves are formed in the fixed frame, and the loading machine is arranged in the loading space. Each pressing plate is correspondingly arranged in one strip-shaped clamping groove, after each pressing plate is subjected to the action of a loading force, the pressure applying surface of each pressing plate can apply pressure to the end part of the adjacent pressing plate in a contact manner, and then each pressing plate is pressed to move along the respective strip-shaped clamping groove until the pressure applying surface of each pressing plate is in pressing contact with each surface of the coal and rock mass sample; by means of the mode, the loaded experiment sample can be evenly stressed, the influence of the end face friction effect can be reduced, finally, the accuracy of test data is guaranteed, the disaster-causing mechanism of the coal rock gas hybrid dynamic disaster is effectively revealed, and the method has important significance on theoretical research of the coal rock gas hybrid dynamic disaster.

Description

Technical Field

[0001] The utility model relates to a coal-rock sample gas-containing mechanical loading test device, belonging to the technical field of research on the mechanism of coal-rock gas composite dynamic disasters. Background Art

[0002] At present, the depth of coal mining is increasing at a rate of 10 to 25 meters per year. In some areas, shallow coal resources are already facing depletion, and the mining depth is approaching one kilometer, and some even exceed one kilometer. As the depth and intensity of coal mining continue to increase, the probability of coal-rock gas complex dynamic disasters has also increased.

[0003] In the early days, research on coal-rock gas complex dynamic disasters mainly focused on the study of the mechanical characteristics of gas-containing coal bodies under stress. For this purpose, the industry has developed a gas-containing mechanical test device that can simulate the stress conditions of coal-rock samples in coal mines. However, the current mechanical recording test device still has some technical problems to be solved. Due to dimensional errors during processing, the various pressure plates of the existing device move synchronously with the loading rod during loading. There will be a problem of stress loading blank angle during loading, and the coal-rock samples will be affected by the end face friction effect during loading, which ultimately leads to low accuracy of the test data and cannot meet the required requirements.

[0004] Therefore, how to provide a new device that can effectively solve the problem of blank angle of stress loading, make the loaded test specimens evenly stressed, and reduce the influence of end face friction effect, and ultimately ensure the accuracy of test data, is the research direction required for this application. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the utility model provides a coal-rock sample containing gas mechanical loading test device, which makes the loaded experimental sample evenly stressed and can reduce the influence of the end face friction effect, ultimately ensuring the accuracy of the test data, effectively revealing the disaster-causing mechanism of coal-rock gas composite dynamic disasters, and is of great significance for the theoretical research on coal-rock gas composite dynamic disasters.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a coal rock sample containing gas mechanical loading test device, including a shell, a loading body and a loading machine, the loading body is inside the shell, and the loading machine is installed on the loading body.

[0007] The loading body includes a fixed frame and four pressing plates. The four pressing plates are arranged in a rectangle to enclose a loading space, and the coal and rock mass sample is placed in the loading space. The fixed frame is provided with four strip-shaped card slots, and each pressing plate is respectively installed in a strip-shaped card slot and can move along its respective strip-shaped card slot. A limiting groove is provided at one end of each strip-shaped card slot for limiting the moving position of each pressing plate. Ball rows are installed on the force-bearing surfaces of the pressing plates, and the ball rows are in contact with the loading shaft of the loading machine, so that the loading shaft applies a loading force to the pressing plate through the ball rows. When each pressing plate is subjected to the loading force, the pressing surface of each pressing plate will contact and press the end of an adjacent pressing plate, and then each pressing plate is pressed to move along its respective strip-shaped card slot until the pressing surfaces of all pressing plates are tightly in contact with all surfaces of the coal and rock mass sample. During the movement of the pressing plate, the ball row moves relative to the loading shaft.

[0008] Gas inlet holes, gas outlet holes and acoustic emission channels are opened on the outer shell. The gas inlet holes and gas outlet holes are respectively located at both ends of the loading body for injecting gas into the outer shell and discharging gas. The acoustic emission channel is used for the signal line of the acoustic emission sensor to extend out of the outer shell to obtain corresponding data.

[0009] Furthermore, when each pressing plate is pressed and moves, it moves in a clockwise or counterclockwise direction. Only this unified movement direction can realize the synchronous movement of each pressing plate under pressure.

[0010] Furthermore, it also includes a connecting plate, and the connecting plate is installed on the fixed frame for strengthening the fixed frame.

[0011] Furthermore, lubricating oil is coated at the contact positions between adjacent pressing plates. In this way, the friction at the contact positions is reduced, which is convenient for each pressing plate to move after being pressed.

[0012] Furthermore, a plurality of uniformly distributed steel balls are installed in the ball row for reducing the friction between it and the loading shaft when the pressing plate is pressed and moves.

[0013] Compared with the prior art, the utility model adopts a combination of an outer shell, a loading body and a loading machine. During the test, the loading shafts of each loading machine apply pressure to each pressing plate. When each pressing plate is subjected to the loading force, the pressing surface of each pressing plate will contact and press the end of an adjacent pressing plate, and then each pressing plate is pressed to move along its respective strip-shaped card slot until the pressing surfaces of all pressing plates are tightly in contact with all surfaces of the coal and rock mass sample, so as to ensure uniform pressure on the surface of the coal and rock mass sample by the pressing plate, and solve the problem of the stress loading blank angle. In addition, this way of moving and loading the pressing plate can effectively reduce the end face friction effect, ensure the required loading effect, finally ensure the accuracy of the obtained test data, and effectively reveal the disaster-causing mechanism of coal-rock-gas complex dynamic disasters, which has important significance for the theoretical research of coal-rock-gas complex dynamic disasters. Description of the Drawings

[0014] Figure 1 is the overall structural schematic diagram of the present utility model;

[0015] Figure 2 is Figure 1 the right view of

[0016] Figure 3 is the structural schematic diagram of the loading main body in the present utility model;

[0017] Figure 4 is the movement schematic diagram when the pressing plate works in the present utility model.

[0018] In the figure: 1, gas inlet hole; 2, gas outlet hole; 3, acoustic emission channel; 4, strip-shaped card slot; 5, pressing plate; 6, ball row; 7, connecting plate; 8, limiting groove. Specific embodiments

[0019] The present utility model will be further described below.

[0020] As Figure 1 and 2 shown, the present utility model includes a housing, a loading main body and a loading machine. The loading main body is inside the housing, and the loading machine is installed on the loading main body.

[0021] As Figure 3 shown, the loading main body includes a fixed frame and four pressing plates 5. The four pressing plates 5 are arranged in a rectangle to enclose a loading space. The coal and rock mass sample is placed in the loading space. Four strip-shaped card slots 4 are provided on the fixed frame. Each pressing plate 5 is respectively installed in a strip-shaped card slot 4 and can move along its respective strip-shaped card slot 4; a limiting groove 8 is provided at one end of each strip-shaped card slot 4 for limiting the moving position of each pressing plate 5; a ball row 6 is installed on the stress surface of each pressing plate 5. The ball row 6 contacts the loading shaft of the loading machine for the loading shaft to apply a loading force to the pressing plate 5 through the ball row 6; a plurality of uniformly distributed steel balls are installed in the ball row 6 for reducing the friction between it and the loading shaft when the pressing plate 5 is pressed and moves; as Figure 4 shown, when each pressing plate 5 is subjected to a loading force, the pressing surface of each pressing plate 5 will contact and press the end of an adjacent pressing plate. Then each pressing plate 5 is pressed and moves along its respective strip-shaped card slot 4 until the pressing surfaces of all pressing plates 5 are tightly in contact with all surfaces of the coal and rock mass sample; the ball row 6 moves relative to the loading shaft during the movement of the pressing plate 5; when each pressing plate 5 is pressed and moves, it moves in a clockwise or counterclockwise direction. Such a unified movement direction can realize the synchronous movement of each pressing plate 5 under pressure.

[0022] The gas inlet hole 1, the gas outlet hole 2 and the acoustic emission channel 3 are opened on the outer shell. The gas inlet hole 1 and the gas outlet hole 2 are respectively located at both ends of the loading main body and are used for injecting gas into the outer shell and discharging gas; the acoustic emission channel 3 is used for the signal line of the acoustic emission sensor to extend out of the outer shell to obtain corresponding data.

[0023] As an improvement of the present utility model, it further includes a connecting plate 7 which is installed on the fixed frame and is used for strengthening the fixed frame.

[0024] As another improvement of the present utility model, lubricating oil is coated at the contact positions of two adjacent pressing plates 5. In this way, the friction force at the contact positions is reduced, facilitating the movement of each pressing plate 5 after being pressed.

[0025] The outer shell, the loading machine, the acoustic emission sensor and the gas delivery pump adopted in the present utility model are all existing components or devices and can be directly obtained through the market.

[0026] During operation, a coal and rock mass specimen with the required size is sampled and processed on-site for the required test. The coal and rock mass specimen is placed in the loading main body, and then the pressure value required to be applied by each loading machine and the gas pressure value required during loading are set as needed. Then, the gas outlet hole is blocked, and the gas inlet hole 1 is connected to the gas delivery pump. At the same time, the acoustic emission sensor is arranged on the surface of the coal and rock mass specimen; after completion, the simulation of high stress and high gas tests in coal mines is started. The gas delivery pump is started to inject gas into the outer shell until the set gas pressure value is reached and then stopped; at the same time, each loading machine is started. At this time, each loading shaft applies pressure to each pressing plate 5. After each pressing plate 5 is subjected to the loading force, the pressing surface of each pressing plate 5 will contact and press the end of an adjacent pressing plate. Then, each pressing plate 5 moves along its respective strip-shaped card slot 4 under pressure until the pressing surfaces of all pressing plates 5 are in close contact with all surfaces of the coal and rock mass specimen. When the set pressure value is reached, it stops and maintains the current pressure value, thereby ensuring that the pressing plate 5 uniformly presses the surface of the coal and rock mass specimen; in addition, this way of moving and loading the pressing plate 5 can effectively reduce the end face friction effect and ensure the required loading effect. Finally, the acoustic emission data during the entire loading process of the coal and rock mass specimen is obtained through the acoustic emission sensor. After the test is completed, the gas delivery pump is turned off, and the gas outlet hole 2 is opened to discharge the gas. At the same time, each loading machine is controlled to relieve pressure and reset. Finally, the coal and rock mass specimen is taken out of the loading main body to complete the test process of the coal and rock mass specimen.

[0027] The above is only the preferred implementation manner of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and retouches can still be made, and these improvements and retouches should also be regarded as the protection scope of the present utility model.

Claims

1. A mechanical loading test device for a coal and rock mass specimen containing gas, comprising a housing, a loading main body, and a loading machine. The loading main body is inside the housing, and the loading machine is installed on the loading main body. It is characterized in that the loading main body includes a fixed frame and four pressing plates. The four pressing plates are arranged in a rectangle to enclose a loading space. The coal and rock mass specimen is placed in the loading space. There are four strip-shaped card slots on the fixed frame. Each pressing plate is respectively installed in a strip-shaped card slot and can move along its respective strip-shaped card slot. A limit groove is provided at one end of each strip-shaped card slot for limiting the moving position of each pressing plate. A ball row is installed on the force-bearing surface of each pressing plate. The ball row contacts the loading shaft of the loading machine and is used to enable the loading shaft to apply a loading force to the pressing plate through the ball row. When each pressing plate is subjected to a loading force, the pressing surface of each pressing plate will contact and press the end of an adjacent pressing plate. Then, each pressing plate is compressed and moves along its respective strip-shaped card slot until the pressing surfaces of all pressing plates are tightly in contact with all surfaces of the coal and rock mass specimen. During the movement of the pressing plate, the ball row moves relative to the loading shaft. A gas inlet hole, a gas outlet hole, and an acoustic emission channel are opened on the housing. The gas inlet hole and the gas outlet hole are respectively at both ends of the loading main body and are used for injecting gas into the housing and discharging gas. The acoustic emission channel is used to extend the signal line of the acoustic emission sensor out of the housing to obtain corresponding data.

2. The mechanical loading test device for gas-containing coal and rock mass specimens according to claim 1, characterized in that, When each pressing plate is compressed and moves, it moves in a clockwise or counterclockwise direction.

3. The coal and rock mass sample gas-containing mechanical loading test device according to claim 1, wherein, It further includes a connecting plate installed on the fixed frame for strengthening the fixed frame.

4. The coal and rock mass specimen gas-containing mechanical loading test device according to claim 1, characterized in that, Lubricating oil is coated at the contact position between two adjacent pressing plates.

5. The coal and rock mass sample gas-containing mechanical loading test device according to claim 1, characterized in that, A plurality of uniformly distributed steel balls are installed in the ball row to reduce the friction between it and the loading shaft when the pressing plate is compressed and moves.

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