Gas flow characteristic testing device for scattered coal and rock mass

Abstract

The invention relates to the technical field of gas flowability tests, in particular to a scattered coal and rock mass gas flowability characteristic testing device which comprises a sealing box, a gas inlet pipe is fixedly connected to one side of the sealing box, a gas outlet pipe is fixedly connected to the other side of the sealing box, and a side plate is installed at the top end of the sealing box. A first hydraulic rod is fixedly connected to one side of the side plate, and a push plate is fixedly connected to the output end of the first hydraulic rod. By arranging the screening assembly, scattered and crushed coal and rock masses can be screened before being put into the sealing box, so that the size of the scattered and crushed coal and rock masses entering the sealing box meets the test requirement; according to the coal and rock mass pressurizing device, coal and rock masses with different heights can be pressurized step by step, so that the scattered and crushed coal and rock masses at the bottom and the top can be uniformly pressurized, the environment in a mine can be simulated, gas can conveniently permeate into the scattered and crushed coal and rock masses, and the problem that the pressure is not uniform in the coal and rock mass pressurizing process is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas fluidity testing, and in particular to a device for testing gas flow characteristics of loose coal and rock mass. Background Art

[0002] Loose and broken coal rock mass is formed after the coal body is affected by mining during underground coal mining. It has the characteristics of rich, loose, uneven and irregular pore and fracture structure. It often appears in small kiln goaf areas, goaf collapse zones and other areas. Since gas leakage may occur during underground coal mining, the leaked gas will pose a safety hazard to operators in the coal mine area. Therefore, it is necessary to use a gas flow characteristic test device to conduct experiments in loose and broken coal rock mass. The gas flow characteristic test requires on-site sampling and combined with test equipment to carry out the test. The external stress, deformation, environment and other conditions of the coal rock sample are changed through instruments and equipment to simulate the experimental study of gas flow characteristics in loose and broken coal rock mass during underground coal mining.

[0003] When testing the fluidity of gas passing through loose coal rock, since the loose coal rock is subjected to different extrusion forces at different heights during the loading process, it will cause the gas permeability to be uneven, affecting the test results. At the same time, the particles of the loose coal rock are broken or rearranged during the loading process, and the permeability decreases exponentially with increasing stress. Therefore, the present application proposes a test device for the gas flow characteristics of loose coal rock. Summary of the Invention

[0004] The purpose of the present invention is to address the problem of uneven pressure encountered during the pressurization of coal and rock masses in the background technology, and to propose a gas flow characteristic test device for loose coal and rock masses.

[0005] The technical solution of the present invention is a device for testing the gas flow characteristics of a loose coal and rock mass, comprising a sealed box, an air inlet pipe being fixedly connected to one side of the sealed box, an air outlet pipe being fixedly connected to the other side of the sealed box, a side plate being mounted on the top of the sealed box, a first hydraulic rod being fixedly connected to one side of the side plate, a push plate being fixedly connected to the output end of the first hydraulic rod, a valve being fixedly connected to the outer wall of the air outlet pipe, a mounting tube being fixedly connected to one side of the air outlet pipe, and a gas flowmeter being mounted on the inner wall of the mounting tube;

[0006] Also included is a screening assembly for controlling the size of the coal and rock mass, wherein the screening assembly is disposed on the top of the sealing box;

[0007] The sealing box is provided with an extrusion assembly for layered pressurization, the extrusion assembly comprising a pressing plate, and the pressing plate is provided with a plurality of square grooves;

[0008] A control component for controlling the opening and closing of the square slot is provided inside the extrusion component.

[0009] Optionally, the screening assembly includes a mounting plate, which is fixed to the top of the sealing box, a motor is fixed to one side of the mounting plate, a cam is fixed to the output end of the motor, a mounting piece is installed on one side of the top of the sealing box by screws, a spring is fixed to the top of the mounting piece, an L-shaped plate is fixed to the top of the spring, a screen is fixed to one side of the L-shaped plate, the screen is arranged at the top of the sealing box, and the push plate is arranged inside the screen.

[0010] Optionally, the extrusion assembly further includes a vertical rod, which is fixed to the top of the pressure plate, and the vertical rod passes through the screen and the push plate. The top of the push plate is fixed with a push rod, and the top of the push rod is rotatably connected to a rotating plate, and the rotating plate is arranged at the top of the vertical rod.

[0011] Optionally, the control component includes a rotating rod, which is rotatably connected to the top of the pressure plate, and the top of the rotating rod passes through the screen and the push plate. A mounting slot is opened inside the pressure plate, and a gear is fixed to the bottom of the rotating rod. The gear is arranged inside the mounting slot, and one side of the gear is meshed with a first rack, and one side of the first rack is fixed with a first sealing plate. The first sealing plates are provided in multiple groups and are distributed in parallel inside the mounting slot. The multiple groups of the first sealing plates are connected to each other through the first connecting plate, and the other side of the gear is meshed with a second rack, and one side of the second rack is fixed with a second sealing plate. The second sealing plates are provided in multiple groups, and the multiple groups of the second sealing plates are connected through the second connecting plate, and the first sealing plate and the second sealing plate are staggered.

[0012] Optionally, a threaded groove is provided at the top end of the vertical rod, a threaded rod is threadedly connected to the inner wall of the threaded groove, and a circular plate is fixed to the top end of the threaded rod.

[0013] Optionally, the top end of the rotating rod is rotatably connected to a top plate via a rotating shaft, a magnet is installed inside the top plate, a protrusion is fixed to the top end of the top plate, and two groups of top plates and magnets are provided and symmetrically distributed at the top end of the rotating rod.

[0014] Optionally, a screen frame is installed at the bottom of the inner wall of the sealing box, a second hydraulic rod is fixedly connected to the bottom of the inner wall of the screen frame, an output end of the second hydraulic rod is fixedly connected to a screen plate, and the screen plate is slidably arranged on the inner wall of the screen frame.

[0015] Optionally, a temperature detector is fixedly connected to the inner wall of the sealed box, and a baffle is fixedly connected to the inner wall of the sealed box. The baffle is semicircular in shape and is arranged on the top of the temperature detector.

[0016] Optionally, the top end of the pressure plate is fixedly connected to a plurality of guide plates, the guide plates are inclined toward the square groove, the inner wall of the square groove is fixedly connected to a plurality of inclined plates, and the inclined plates are arranged at the top ends of the first sealing plate and the second sealing plate.

[0017] Optionally, a blocking net is installed at the connection between the sealing box and the air outlet pipe, and the blocking net is circular in shape.

[0018] Compared with the prior art, this application has at least one of the following beneficial technical effects:

[0019] The present invention provides a screening component, which can screen the loose coal and rock before placing it into a sealed box, so that the size of the loose coal and rock entering the sealed box meets the test requirements. By providing an extrusion component, the coal and rock masses at different heights can be pressurized step by step, so that the loose coal and rock masses at the bottom and top can be evenly pressurized, which is beneficial to simulating the environment inside the mine and facilitates the infiltration of gas into the loose coal and rock masses, solving the problem of uneven pressure encountered during the pressurization of the coal and rock masses. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a test device for gas flow characteristics of loose coal and rock mass;

[0021] Figure 2 This is a schematic diagram of the overall first cross-sectional structure of a test device for gas flow characteristics of loose coal and rock mass;

[0022] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at point A;

[0023] Figure 4 for Figure 2 A schematic diagram of the enlarged structure at point B;

[0024] Figure 5 A schematic diagram of a screening component of a test device for gas flow characteristics of loose coal and rock mass;

[0025] Figure 6 This is a schematic diagram of the overall second cross-section structure of a test device for gas flow characteristics of loose coal and rock mass;

[0026] Figure 7 for Figure 6 Schematic diagram of the enlarged structure at C;

[0027] Figure 8 This is a schematic diagram of the extrusion assembly structure of a device for testing the gas flow characteristics of loose coal and rock mass;

[0028] Figure 9 This is a schematic diagram of the pressure plate structure of a test device for gas flow characteristics of loose coal and rock mass;

[0029] Figure 10 This is a schematic diagram of the combined structure of the first sealing plate and the second sealing plate of a device for testing the gas flow characteristics of loose coal and rock mass;

[0030] Figure 11 This is a schematic diagram of the split structure of the first and second sealing plates of a test device for gas flow characteristics of loose coal and rock mass.

[0031] Figure numerals: 1. sealing box; 2. air inlet pipe; 3. air outlet pipe; 4. side plate; 5. first hydraulic rod; 6. push plate; 7. temperature detector; 8. valve; 9. mounting plate; 10. motor; 11. cam; 12. mounting plate; 13. spring; 14. L-shaped plate; 15. screen; 16. vertical rod; 17. pressure plate; 18. push rod; 19. rotating plate; 20. rotating rod; 21. gear; 22. first rack; 23. first sealing plate; 24. first connecting plate; 25. second rack; 26. second sealing plate; 27. second connecting plate; 28. circular plate; 29. ​​top plate; 30. magnet; 31. mounting cylinder; 32. gas flowmeter; 33. mesh frame; 34. mesh plate; 35. second hydraulic rod; 36. baffle; 37. baffle; 38. guide plate; 39. inclined plate. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 and Figure 2 As shown, the present invention proposes a test device for the gas flow characteristics of loose coal and rock mass, comprising a sealed box 1, one side of the sealed box 1 is fixedly connected to an air inlet pipe 2, the other side of the sealed box 1 is fixedly connected to an air outlet pipe 3, a side plate 4 is installed on the top of the sealed box 1, one side of the side plate 4 is fixedly connected to a first hydraulic rod 5, the output end of the first hydraulic rod 5 is fixedly connected to a push plate 6, the outer wall of the air outlet pipe 3 is fixedly connected to a valve 8, one side of the air outlet pipe 3 is fixedly connected to a mounting cylinder 31, and the inner wall of the mounting cylinder 31 is installed with a gas flowmeter 32.

[0034] In order to solve the problem of uneven pressure encountered during the pressurization of the coal rock mass, when it is necessary to test the gas flow characteristics in the loose coal rock mass, the loose coal rock mass can be added to the sealing box 1, and the loose coal rock mass above can be pressurized by the first hydraulic rod 5 and the push plate 6 to facilitate the coal rock mass to absorb the gas. After the loose coal rock mass is pressurized, gas can be introduced into the sealing box 1 through the air inlet pipe 2 to allow the gas to penetrate into the loose coal rock mass. After the penetration reaches the specified time, the valve 8 can be opened to discharge the gas through the outlet pipe 3. When the gas passes through the gas flowmeter 32, the flow characteristics of the gas can be detected.

[0035] like Figure 5, also includes a screening component for controlling the size of the coal rock mass, the screening component is arranged at the top of the sealed box 1, the screening component includes a mounting plate 9, the mounting plate 9 is fixedly connected to the top of the sealed box 1, one side of the mounting plate 9 is fixedly connected to a motor 10, the output end of the motor 10 is fixedly connected to a cam 11, one side of the top of the sealed box 1 is fixedly installed with a mounting piece 12 by screws, the top of the mounting piece 12 is fixedly connected to a spring 13, the top of the spring 13 is fixedly connected to an L-shaped plate 14, one side of the L-shaped plate 14 is fixedly connected to a screen 15, the screen 15 is arranged at the top of the sealed box 1, and the push plate 6 is arranged inside the screen 15.

[0036] When screening loose coal and rock, the loose coal and rock can be placed on the screen 15, and the two sets of motors 10 are started. The cam 11 is driven to rotate by the motor 10. When the protruding end of the cam 11 reaches the top of the L-shaped plate 14, the L-shaped plate 14 can be pushed downward. When the L-shaped plate 14 moves downward, the screen 15 is driven to move downward and the spring 13 is squeezed at the same time. After the protruding end of the cam 11 is removed from the top of the L-shaped plate 14, the spring 13 is reset and pushes the L-shaped plate 14 and the screen 15 to move upward. When the screen 15 moves back and forth up and down, loose coal and rock that meets the size can be dropped down through the screen 15. Since the mounting plate 12 is mounted on the sealing box 1 by screws, the screen 15 can be removed from the top of the sealing box 1 by removing the screws after the screening is completed.

[0037] like Figure 8 、 Figure 9 The interior of the sealed box 1 is provided with an extrusion assembly for layered pressurization, and the extrusion assembly includes a pressing plate 17, on which a plurality of square grooves are provided. The extrusion assembly also includes a vertical rod 16, which is fixed to the top of the pressing plate 17. The vertical rod 16 passes through the screen 15 and the push plate 6. The top of the push plate 6 is fixed with a push rod 18, and the top of the push rod 18 is rotatably connected to a rotating plate 19, which is arranged at the top of the vertical rod 16.

[0038] When it is necessary to squeeze the loose coal and rock mass accumulated below, the rotating plate 19 can be rotated so that the rotating plate 19 is rotated above the vertical rod 16, and then the first hydraulic rod 5 is started, and the push plate 6 is pushed downward by the first hydraulic rod 5. When the push plate 6 moves downward, it will drive the top rod 18 and the rotating plate 19 to move downward together, and when the rotating plate 19 moves downward, it will push the bottom top rod 18 to move downward, and when the top rod 18 moves downward, it will drive the pressure plate 17 to move downward together, thereby pressurizing the loose coal and rock mass below, so that the loose coal and rock mass below is loaded and stable.

[0039] like Figures 8-11, a control component for controlling the opening and closing of the square slot is provided inside the extrusion component, and the control component includes a rotating rod 20, the rotating rod 20 is rotatably connected to the top end of the pressure plate 17, the top end of the rotating rod 20 passes through the screen 15 and the push plate 6, and a mounting slot is opened inside the pressure plate 17, and a gear 21 is fixed to the bottom of the rotating rod 20, and the gear 21 is arranged inside the mounting slot, and one side of the gear 21 is meshed with a first rack 22, and one side of the first rack 22 is fixedly connected to a first sealing plate 23, and the first sealing plate 23 is provided with multiple groups and is distributed in parallel inside the mounting slot, and multiple groups of the first sealing plates 23 are connected to each other through a first connecting plate 24. The other side of the gear 21 is meshed with a second rack 25, and one side of the second rack 25 is fixedly connected to a second sealing plate 26, and the second sealing plate 26 is provided with multiple groups, and multiple groups of the second sealing plates 26 are connected by a second connecting plate 27, and the first sealing plate 23 and the second sealing plate 26 are staggered.

[0040] When it is necessary to screen the loose coal and rock mass, the rotating rod 20 can be rotated to make the rotating rod 20 drive the gear 21 below to rotate. When the gear 21 rotates, it drives the first rack 22 to move to one side. When the first rack 22 moves, it drives the first sealing plate 23 to move together. Since multiple groups of first sealing plates 23 are connected by the first connecting plate 24, multiple groups of first sealing plates 23 can be driven to move at the same time, and the second rack 25 set on the other side of the gear 21 will move in the opposite direction of the first rack 22, and at the same time drive the second connecting plate 27 and multiple groups of second When the first sealing plate 23 and the second sealing plate 26 are moved together, the square groove can be opened; and when the square groove needs to be closed, the rotating rod 20 can be rotated in the opposite direction, thereby driving the gear 21 to rotate in the opposite direction, and at the same time, the first rack 22, the first sealing plate 23, the first connecting plate 24, the second rack 25, the second sealing plate 26 and the second connecting plate 27 will move in opposite directions until the square groove is closed by the first sealing plate 23 and the second sealing plate 26, so as to facilitate the pressurization of the loose coal rock mass below through the pressure plate 17.

[0041] like Figure 7 A threaded groove is formed at the top of the vertical rod 16 , a threaded rod is threadedly connected to the inner wall of the threaded groove, and a circular plate 28 is fixed to the top of the threaded rod.

[0042] By setting a threaded groove at the top of the vertical rod 16, the circular plate 28 can be easily installed in the threaded groove through the threaded rod. After the pressurization of the loose coal and rock mass is completed, the first hydraulic rod 5 can be retracted and the push plate 6 can be driven to move upward. When the push plate 6 moves upward to above the vertical rod 16, it can push the circular plate 28 to move upward, thereby driving the vertical rod 16 and the pressure plate 17 to move upward, so that the pressure plate 17 is removed from the squeezed loose coal and rock mass, which is convenient for subsequent pressurization operations. At the same time, when the pressure plate 17 is no longer needed, the pressure plate 17 can be easily removed by retracting the first hydraulic pressure.

[0043] like Figure 7 The top end of the rotating rod 20 is rotatably connected to a top plate 29 via a rotating shaft. A magnet 30 is installed inside the top plate 29. A protrusion is fixed to the top end of the top plate 29. There are two groups of top plates 29 and magnets 30, which are symmetrically distributed at the top end of the rotating rod 20.

[0044] By providing a top plate 29 at the top end of the rotating rod 20, when the rotating rod 20 needs to be rotated, the two groups of top plates 29 can be moved to both sides by pulling the protrusion, so that the two groups of top plates 29 are released from the attraction and fixation of the two groups of magnets 30. After the two groups of top plates 29 are opened, the rotating rod 20 can be driven to rotate by rotating the two groups of top plates 29. After the two groups of top plates 29 are attracted by the two groups of magnets 30, they can maintain a cylindrical shape consistent with the size of the rotating rod 20, making it convenient for the screen 15 to pass through the rotating rod 20 when the screen 15 is removed.

[0045] like Figure 4 A mesh frame 33 is installed at the bottom of the inner wall of the sealing box 1, and a second hydraulic rod 35 is fixed to the bottom of the inner wall of the mesh frame 33. The output end of the second hydraulic rod 35 is fixed to a mesh plate 34, and the mesh plate 34 is slidably set on the inner wall of the mesh frame 33.

[0046] By arranging a mesh frame 33 and a mesh plate 34 inside the sealed box 1, when the gas enters the sealed box 1 through the air inlet pipe 2, the mesh frame 33 and the mesh plate 34 can be used to disperse the gas, so that the gas enters the sealed box 1 evenly. When the speed of the gas entry needs to be adjusted, the second hydraulic rod 35 can be started to push the mesh plate 34 to slide in the mesh frame 33, so that the mesh holes of the mesh plate 34 and the mesh frame 33 are staggered with each other, thereby adjusting the speed of the gas passing through the mesh plate 34 and the mesh frame 33.

[0047] like Figure 3 A temperature detector 7 is fixedly connected to the inner wall of the sealed box 1 , and a baffle 37 is fixedly connected to the inner wall of the sealed box 1 . The baffle 37 is semicircular in shape and is arranged on the top of the temperature detector 7 .

[0048] By setting a temperature detector 7 in the sealed box 1, the temperature in the sealed box 1 can be detected in real time to prevent the temperature from exceeding the test range. By setting a baffle 37, protection can be provided above the temperature detection to prevent falling loose coal and rock from damaging the temperature detector 7.

[0049] like Figure 9 The top end of the pressure plate 17 is fixed with multiple sets of guide plates 38, and the guide plates 38 are inclined toward the square groove. The inner wall of the square groove is fixed with multiple sets of inclined plates 39, and the inclined plates 39 are arranged at the top ends of the first sealing plate 23 and the second sealing plate 26.

[0050] By arranging multiple sets of guide plates 38 at the top of the pressure plate 17, when the loose coal and rock mass falls on the pressure plate 17, the multiple sets of guide plates 38 can be used to guide the loose coal and rock mass into the square trough. By arranging inclined plates 39 inside the square trough, the loose coal and rock mass can be guided to the center of the square trough.

[0051] like Figure 3 A blocking net 36 is installed at the connection between the sealing box 1 and the air outlet pipe 3, and the blocking net 36 is circular in shape.

[0052] By providing a blocking net 36 at the connection between the sealing box 1 and the gas outlet pipe 3 , the blocking net 36 can prevent the loose coal and rock from entering the gas outlet pipe 3 when the valve 8 is opened.

[0053] In this embodiment, in order to solve the problem of uneven pressure encountered during the pressurization of the coal rock mass, when it is necessary to test the gas flow characteristics in the loose coal rock mass, the loose coal rock mass can be placed on the screen 15, and the two sets of top plates 29 can be moved to both sides by pulling the protrusions, so that the two sets of top plates 29 are released from the attraction and fixation of the two sets of magnets 30. After the two sets of top plates 29 are opened, it is convenient to rotate the two sets of top plates 29 to drive the rotating rod 20 to rotate, and the rotating rod 20 will drive the gear 21 to rotate. When the gear 21 rotates, it will drive the first rack 22 to move to one side. When the first rack 22 moves, it will drive the first sealing plate 23 to move together. Since multiple sets of first sealing plates 23 are connected by the first connecting plate 24, multiple sets of first sealing plates 23 can be driven to move at the same time, and the second rack 25 set on the other side of the gear 21 will move in the opposite direction of the first rack 22, and at the same time drive the second rack 25 to move. The two connecting plates 27 and the plurality of second sealing plates 26 are together, and when the first sealing plate 23 and the second sealing plate 26 move in opposite directions, the square slot can be opened, and the two sets of motors 10 are started, and the cam 11 is driven by the motor 10 to rotate. When the protruding end of the cam 11 reaches the top of the L-shaped plate 14, the L-shaped plate 14 and the screen 15 can be moved downward, and the spring 13 will be squeezed at the same time. After the protruding end of the cam 11 is removed from the top of the L-shaped plate 14, the spring 13 will reset and push the L-shaped plate 14 and the screen 15 to move upward. When the screen 15 moves back and forth up and down, the loose coal and rock mass that meets the size can be dropped downward through the screen 15. The dropped loose coal and rock mass will pass through the square slot and fall into the bottom of the sealing box 1. Since the mounting piece 12 is mounted on the sealing box 1 by screws, the screen 15 can be removed from the top of the sealing box 1 by removing the screws after the screening is completed.

[0054] When it is necessary to squeeze the loose coal and rock mass accumulated below, the rotating rod 20 can be rotated in the opposite direction, thereby driving the gear 21 to rotate in the opposite direction, and at the same time, the first rack 22, the first sealing plate 23, the first connecting plate 24, the second rack 25, the second sealing plate 26 and the second connecting plate 27 will move in opposite directions until the square groove is closed by the first sealing plate 23 and the second sealing plate 26, so as to facilitate the pressurization of the loose coal and rock mass below through the pressure plate 17, and then the rotating plate 19 is rotated to be rotated above the vertical rod 16, and the first hydraulic rod 5 is started to push the push plate 6 to move downward, and when the push plate 6 moves downward, it will drive the top rod 18 and the rotating plate 19 to move downward together, and when the rotating plate 19 moves downward, it will push the bottom top rod 18 to move downward. It will drive the pressure plate 17 to move downward, thereby pressurizing the loose coal and rock mass below, so that the loose coal and rock mass below is loaded stably, which is convenient for the coal and rock mass to absorb gas, and the coal and rock masses at different heights can be increased step by step, which is conducive to simulating the environment in the mine. By providing a threaded groove at the top of the vertical rod 16, the circular plate 28 can be easily installed in the threaded groove through the threaded rod. After the loose coal and rock mass is pressurized, the first hydraulic rod 5 can be retracted and the push plate 6 can be driven to move upward. When the push plate 6 moves upward to above the vertical rod 16, it can push the circular plate 28 to move upward, thereby driving the vertical rod 16 and the pressure plate 17 to move upward, so that the pressure plate 17 is removed from the squeezed loose coal and rock mass, which is convenient for subsequent pressurization operations. At the same time, when the pressure plate 17 is no longer needed, the pressure plate 17 can be easily removed by retracting the first hydraulic pressure.

[0055] After the loose coal and rock mass is pressurized, gas can be introduced into the sealed box 1 through the air inlet pipe 2. When the gas enters the sealed box 1 through the air inlet pipe 2, it is convenient to disperse the gas through the mesh frame 33 and the mesh plate 34, so that the gas enters the sealed box 1 evenly. When the speed of gas entry needs to be adjusted, the mesh plate 34 can be pushed to slide in the mesh frame 33 by activating the second hydraulic rod 35, so that the mesh holes of the mesh plate 34 and the mesh frame 33 are staggered with each other, thereby adjusting the speed of gas passing through the mesh plate 34 and the mesh frame 33 and entering the sealed box 1. The gas will penetrate into the loose coal and rock mass. By setting a temperature detector 7 in the sealed box 1, the temperature in the sealed box 1 can be detected in real time to prevent the temperature from exceeding the test range. By setting a baffle 37, protection can be provided for the upper part of the temperature detection to prevent the falling loose coal and rock mass from damaging the temperature detector 7. After the penetration reaches the specified time, the valve 8 can be opened to allow the gas to be discharged through the outlet pipe 3. The baffle 36 can be used to prevent the loose coal and rock mass from entering the outlet pipe 3. When the gas passes through the gas flowmeter 32, the flow characteristics of the gas can be detected.

[0056] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art may make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A test device for gas flow characteristics of loose coal and rock mass, comprising a sealed box (1), one side of the sealed box (1) is fixedly connected to an air inlet pipe (2), the other side of the sealed box (1) is fixedly connected to an air outlet pipe (3), a side plate (4) is installed on the top of the sealed box (1), one side of the side plate (4) is fixedly connected to a first hydraulic rod (5), the output end of the first hydraulic rod (5) is fixedly connected to a push plate (6), the outer wall of the air outlet pipe (3) is fixedly connected to a valve (8), one side of the air outlet pipe (3) is fixedly connected to a mounting cylinder (31), and the inner wall of the mounting cylinder (31) is installed with a gas flowmeter (32), characterized in that: It also includes a screening component for controlling the size of the coal and rock mass, and the screening component is arranged on the top of the sealing box (1); An extrusion assembly for layered pressurization is provided inside the sealing box (1), the extrusion assembly comprising a pressing plate (17), and a plurality of square grooves are provided on the pressing plate (17); A control component for controlling the opening and closing of the square slot is provided inside the extrusion component.

2. A gas flow characteristics test device for loose coal and rock mass according to claim 1, characterized in that: The screening assembly comprises a mounting plate (9), the mounting plate (9) being fixedly connected to the top of the sealing box (1), a motor (10) being fixedly connected to one side of the mounting plate (9), a cam (11) being fixedly connected to the output end of the motor (10), a mounting plate (12) being mounted on one side of the top of the sealing box (1) by screws, a spring (13) being fixedly connected to the top of the mounting plate (12), an L-shaped plate (14) being fixedly connected to the top of the spring (13), a screen (15) being fixedly connected to one side of the L-shaped plate (14), the screen (15) being arranged at the top of the sealing box (1), and the push plate (6) being arranged inside the screen (15).

3. A device for testing gas flow characteristics of loose coal and rock mass according to claim 2, characterized in that: The extrusion assembly also includes a vertical rod (16), which is fixed to the top of the pressure plate (17). The vertical rod (16) passes through the screen (15) and the push plate (6). The top of the push plate (6) is fixed with a push rod (18), and the top of the push rod (18) is rotatably connected to a rotating plate (19). The rotating plate (19) is set at the top of the vertical rod (16).

4. A gas flow characteristics test device for loose coal and rock mass according to claim 3, characterized in that: The control assembly includes a rotating rod (20), the rotating rod (20) is rotatably connected to the top end of the pressure plate (17), the top end of the rotating rod (20) passes through the screen (15) and the push plate (6), the interior of the pressure plate (17) is provided with a mounting groove, the bottom of the rotating rod (20) is fixed with a gear (21), the gear (21) is arranged inside the mounting groove, one side of the gear (21) is meshed with a first rack (22), and one side of the first rack (22) is fixed with a first sealing plate (23), The first sealing plates (23) are provided in multiple groups and are distributed in parallel inside the installation groove. The multiple groups of the first sealing plates (23) are connected to each other through a first connecting plate (24). A second rack (25) is engaged with the other side of the gear (21). A second sealing plate (26) is fixed to one side of the second rack (25). The second sealing plates (26) are provided in multiple groups. The multiple groups of the second sealing plates (26) are connected through a second connecting plate (27). The first sealing plates (23) and the second sealing plates (26) are staggered.

5. A gas flow characteristics test device for loose coal and rock mass according to claim 4, characterized in that: A threaded groove is provided at the top of the vertical rod (16), a threaded rod is threadedly connected to the inner wall of the threaded groove, and a circular plate (28) is fixed to the top of the threaded rod.

6. A gas flow characteristics test device for loose coal and rock mass according to claim 5, characterized in that: The top end of the rotating rod (20) is rotatably connected to a top plate (29) via a rotating shaft, a magnet (30) is installed inside the top plate (29), a protrusion is fixed to the top end of the top plate (29), and two groups of top plates (29) and magnets (30) are provided and are symmetrically distributed at the top end of the rotating rod (20).

7. A gas flow characteristics test device for loose coal and rock mass according to claim 6, characterized in that: A mesh frame (33) is installed at the bottom of the inner wall of the sealing box (1), a second hydraulic rod (35) is fixedly connected to the bottom of the inner wall of the mesh frame (33), an output end of the second hydraulic rod (35) is fixedly connected to a mesh plate (34), and the mesh plate (34) is slidably arranged on the inner wall of the mesh frame (33).

8. The device for testing gas flow characteristics of loose coal and rock mass according to claim 7, characterized in that: A temperature detector (7) is fixedly connected to the inner wall of the sealed box (1), and a baffle (37) is fixedly connected to the inner wall of the sealed box (1). The baffle (37) is semicircular in shape and is arranged on the top of the temperature detector (7).

9. A gas flow characteristics test device for loose coal and rock mass according to claim 8, characterized in that: The top end of the pressure plate (17) is fixedly connected to a plurality of guide plates (38), the guide plates (38) are inclined toward the square groove, the inner wall of the square groove is fixedly connected to a plurality of inclined plates (39), and the inclined plates (39) are arranged at the top ends of the first sealing plate (23) and the second sealing plate (26).

10. A gas flow characteristics test device for loose coal and rock mass according to claim 9, characterized in that: A blocking net (36) is installed at the connection between the sealing box (1) and the air outlet pipe (3), and the blocking net (36) is circular in shape.

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