Device and method for testing influence of desorption and seepage of coal rock

Abstract

The invention discloses a coal rock desorption seepage influence testing device and method, and relates to the technical field of coal rock detection.The coal rock desorption seepage influence testing device comprises a testing table, a testing cylinder is arranged above the testing table, a damping fixing mechanism is arranged outside the testing cylinder, the damping fixing mechanism comprises a driving motor arranged outside the testing cylinder, and a driving rod is arranged at the output end of the driving motor; the side, away from the driving motor, of the driving rod is fixedly connected with a first gear, the side edge of the first gear is in meshed connection with a second gear, arc-shaped grooves are circumferentially and evenly formed in the second gear, sliding rods are slidably connected to the side edges of the arc-shaped grooves, sliding plates are fixedly connected to the lower portions of the sliding rods, and the sides, away from the sliding rods, of the sliding plates are fixedly connected with a mounting plate. And the spring is fixedly connected above the mounting plate, so that circumferential uniform fixation and shock absorption of the coal rock sample are realized, the vibration of the coal rock sample caused by overlarge pressure in the testing process is effectively prevented, the stability of the coal rock sample is ensured, and the testing accuracy and the working efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal rock detection, and in particular to a testing device and method for the effect of coal rock desorption and seepage. Background Art

[0002] Coal is a sedimentary rock formed by compaction, distillation, and chemical changes in plant debris. It is primarily found in the upper portions of coalfields and belongs to the coal-bearing rock family. The desorption capacity of coal refers to the ability of coalbed methane to desorb from the surface of the coal matrix when pressure is reduced. Coal seams with strong desorption capacity exhibit excellent gas-phase permeability throughout the gas production process, which translates to better gas production. The stronger the coal desorption capacity, the greater the effective gas permeability during the corresponding development process, which facilitates coalbed methane extraction. Desorption, diffusion, and permeation are closely linked and influence each other. The desorption and diffusion of coalbed methane directly impact gas production and the lifespan of production wells. Therefore, during coalbed methane extraction, attention must be paid to the desorption and permeation characteristics of coal to optimize extraction plans and improve extraction efficiency.

[0003] In the existing technology, during the experiment on coal rock samples, the seepage effect of airflow under different pressures is tested. When the pressure is too high, the coal rock sample may vibrate. Since coal rock is brittle and highly heterogeneous, the accuracy of the test results of the coal rock sample may be affected, and the work efficiency is low. Therefore, it is necessary to propose a testing device and method for the desorption and seepage effect of coal rock. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem in the existing technology that during the experiment on coal rock samples, the seepage effect of airflow under different pressures will be tested. When the pressure is too high, the coal rock sample may vibrate. Due to the brittleness and strong heterogeneity of coal rock, the accuracy of the test results of the coal rock sample may be affected, and the work efficiency is low. A testing device and method for the desorption and seepage effect of coal rock are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A testing device for the effect of coal rock desorption and seepage, comprising a testing platform, a testing cylinder is provided above the testing platform, a shock-absorbing fixing mechanism is provided on the outside of the testing cylinder, the shock-absorbing fixing mechanism comprises a driving motor provided on the outside of the testing cylinder, a driving rod is provided at the output end of the driving motor, a first gear is fixedly connected to the side of the driving rod away from the driving motor, a second gear is meshedly connected to the side of the first gear, an arc groove is uniformly opened in a circumferential manner inside the second gear, a sliding rod is slidably connected to the side of the arc groove, a slide plate is fixedly connected below the slide plate, and a side of the slide plate away from the slide rod is fixedly connected to the side of the slide plate. A mounting plate is fixedly connected to the side, a spring is fixedly connected above the mounting plate, a flexible guard plate is fixedly connected to the side of the spring away from the mounting plate, the slide plate, mounting plate, spring and flexible guard plate are all arranged in a circular manner in multiple groups, after the drive motor is started, the first gear is driven to rotate by the drive rod, the first gear drives multiple groups of arc grooves to rotate through the second gear, the arc groove drives the slide plate and the mounting plate to move through the sliding rod, the mounting plate drives the flexible guard plate to move through the spring, the spring and multiple groups of flexible guard plates move toward the coal rock sample and are fixed for shock absorption.

[0007] Among them, the coal rock sample to be tested needs to be prepared into a cylindrical coal sample of appropriate size, and an air injection hole is opened in the center of the coal sample. The upper end of the coal sample is completely sealed, and the lower end is sealed except for the air injection hole.

[0008] The above technical solution further includes:

[0009] The test cylinder is fixedly connected to the driving motor, the driving rod is rotatably connected to the test cylinder, a convex plate is rotatably connected below the second gear, the convex plate is slidably connected to the slide, and an injection pipe is rotatably connected to the side of the second gear close to the convex plate.

[0010] The injection tube is fixedly connected to the test cylinder, and a tray is fixedly connected to a side of the injection tube away from the second gear.

[0011] A heating tube is provided above the interior of the test cylinder.

[0012] A gas container tube is fixedly installed above the test bench, a flow meter is provided on the side of the gas container tube away from the test bench, a pressure pump is fixedly connected to the side of the flow meter close to the test bench, the pressure pump is fixedly installed above the test bench, an outlet pipe is fixedly connected to the side of the flow meter away from the pressure pump, and the outlet pipe is fixedly connected to the injection pipe.

[0013] A fixing rod is fixedly connected to the upper side of the test bench close to the test cylinder, and the fixing rod is fixedly connected to the test cylinder.

[0014] A gas feed port is provided on the top of the gas container tube.

[0015] The top of the test cylinder is fixedly connected to an air outlet valve pipe, and a measuring container is provided on the side of the test cylinder. The measuring container and the air outlet valve pipe are connected through a conduit.

[0016] A side plate is movably connected to a side of the test cylinder away from the measuring container, and a pull rod is fixedly connected to a side edge of the side plate.

[0017] A method for using a testing device for the effect of coal rock desorption and seepage, comprising the following steps:

[0018] Step 1: Place the coal and rock sample into the test cylinder, start the shock-absorbing and fixing mechanism, and start the driving motor in the shock-absorbing and fixing mechanism to start running. When the driving motor is running, the driving rod is controlled to rotate;

[0019] Step 2: When the driving rod rotates, the first gear starts to rotate. The first gear drives the second gear to rotate by virtue of the meshing connection between the first gear and the second gear. When the second gear rotates, the multiple groups of arc grooves rotate. When the multiple groups of arc grooves rotate, the sliding rods on the inner walls of the arc grooves are subjected to thrust.

[0020] Step 3: The slide bar moves along the inner wall of the arc groove in an arc shape, and when the slide bar moves, the slide bar starts to move, and when the slide bar moves, the mounting plate moves, and the slide bar drives the spring and the flexible guard plate to move through the mounting plate;

[0021] Step 4: Multiple groups of springs and flexible guard plates move in a surrounding manner, and the flexible guard plates move to fit the outside of the coal rock sample. The springs begin to be compressed and generate elastic potential energy prestress to fix and reduce shock on the coal rock sample.

[0022] The present invention has the following beneficial effects:

[0023] 1. In the present invention, through the innovative design of the shock-absorbing and fixing mechanism, a drive motor is used to drive the linkage between the gear and the arc groove, which drives the spring and the flexible guard plate to move toward the coal rock sample and apply elastic potential energy prestress, thereby achieving circumferential and uniform fixation and shock absorption of the coal rock sample. This design not only effectively prevents the vibration of the coal rock sample due to excessive pressure during the test, but also ensures the stability of the coal rock sample, thereby improving the accuracy and work efficiency of the test.

[0024] 2. In this invention, the gas container, flowmeter, pressure pump, and outlet pipe form a flexible gas testing environment. Workers can inject the desired gas into the gas container through the gas inlet and apply the appropriate pressure through the pressure pump. The flowmeter accurately records the airflow rate per unit time, providing critical data for testing. This design allows the testing device to adapt to testing requirements with different gases and pressure conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a testing device and method for the effect of coal rock desorption and seepage proposed by the present invention;

[0026] Figure 2 Schematic diagram of the external structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the side view structure of the present invention;

[0028] Figure 4 Schematic diagram of the internal structure of the test tube in the present invention;

[0029] Figure 5 This is a schematic top view of the internal structure of the test tube in the present invention;

[0030] Figure 6 for Figure 4 A magnified schematic diagram of the structure in the middle.

[0031] In the figure: 1. test bench; 2. test cylinder; 3. drive motor; 4. drive rod; 5. first gear; 6. second gear; 7. arc groove; 8. slide rod; 9. slide plate; 10. mounting plate; 11. spring; 12. flexible protective plate; 13. convex plate; 14. injection pipe; 15. tray; 16. heating pipe; 17. gas container cylinder; 18. flow meter; 19. pressure pump; 20. outlet pipe; 21. fixing rod; 22. gas feed port; 23. outlet valve pipe; 24. measuring container; 25. side plate; 26. pull rod. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Example 1

[0034] like Figures 1-6As shown, a test device for the effect of coal rock desorption and seepage, comprising a test bench 1, a test cylinder 2 is arranged above the test bench 1, a shock-absorbing fixing mechanism is arranged outside the test cylinder 2, the shock-absorbing fixing mechanism comprises a drive motor 3 arranged outside the test cylinder 2, a drive rod 4 is arranged at the output end of the drive motor 3, a first gear 5 is fixedly connected to the side of the drive rod 4 away from the drive motor 3, a second gear 6 is meshedly connected to the side of the first gear 5, an arc groove 7 is uniformly opened in a circumferential manner inside the second gear 6, a slide rod 8 is slidably connected to the side of the arc groove 7, a slide plate 9 is fixedly connected below the slide rod 8, and a mounting plate 1 is fixedly connected to the side of the slide rod 8. 0, a spring 11 is fixedly connected above the mounting plate 10, and a flexible guard plate 12 is fixedly connected to the side of the spring 11 away from the mounting plate 10. The slide plate 9, the mounting plate 10, the spring 11 and the flexible guard plate 12 are all arranged in a circular manner in multiple groups. After the drive motor 3 is started, it drives the first gear 5 to rotate through the drive rod 4. The first gear 5 drives the multiple groups of arc grooves 7 to rotate through the second gear 6. The arc groove 7 drives the slide plate 9 and the mounting plate 10 to move through the sliding rod 8. The mounting plate 10 drives the flexible guard plate 12 to move through the spring 11. The spring 11 and the multiple groups of flexible guard plates 12 move toward the coal rock sample and are fixed for shock absorption.

[0035] The test cylinder 2 is fixedly connected to the drive motor 3, the drive rod 4 is rotatably connected to the test cylinder 2, a convex plate 13 is rotatably connected below the second gear 6, the convex plate 13 is slidably connected to the slide 9, and an injection pipe 14 is rotatably connected to the side of the second gear 6 close to the convex plate 13.

[0036] The injection tube 14 is fixedly connected to the test cylinder 2 , and a tray 15 is fixedly connected to a side of the injection tube 14 away from the second gear 6 .

[0037] A heating tube 16 is provided above the interior of the test tube 2 .

[0038] A gas container tube 17 is fixedly installed above the test bench 1, and a flow meter 18 is provided on the side of the gas container tube 17 away from the test bench 1. A pressure pump 19 is fixedly connected to the side of the flow meter 18 close to the test bench 1. The pressure pump 19 is fixedly installed above the test bench 1, and an air outlet pipe 20 is fixedly connected to the side of the flow meter 18 away from the pressure pump 19. The air outlet pipe 20 is fixedly connected to the injection pipe 14.

[0039] A gas feed port 22 is provided at the top of the gas container tube 17 .

[0040] An air outlet valve tube 23 is fixedly connected to the top of the test cylinder 2, and a measuring container 24 is provided on the side of the test cylinder 2. The measuring container 24 is connected to the air outlet valve tube 23 through a conduit.

[0041] In this embodiment, a test cylinder 2 is provided above the test bench 1, and the shock-absorbing fixing mechanism provided on the outside of the test cylinder 2 is started. The driving motor 3 installed on the outside of the test cylinder 2 in the shock-absorbing fixing mechanism starts to run. When the driving motor 3 runs, it starts to control the driving rod 4 provided at its output end to rotate. When the driving rod 4 rotates, it drives the first gear 5 fixedly connected to the other side to rotate. The first gear 5 drives the second gear 6 to rotate through the meshing connection relationship between the first gear 5 and the second gear 6. A plurality of groups of arc grooves 7 are circumferentially provided inside the second gear 6. A sliding rod 8 is correspondingly connected to the inner wall of each group of arc grooves 7. Each group of sliding rods 8 is restricted by the bottom slide 9 and the convex plate 13 and cannot rotate. The sliding rod 8 is pushed by the arc groove 7 and starts to rotate along The sliding rod 8 drives the slide plate 9 to move by sliding along the inner wall of the arc groove 7. When the slide plate 9 moves, it drives the mounting plate 10 fixedly connected to the other end to start moving. A spring 11 is fixedly installed on the top of the mounting plate 10. When the mounting plate 10 moves, it drives the spring 11 and the flexible guard plate 12 fixedly connected to the spring 11 to move, so that the multiple groups of springs 11 and the flexible guard plates 12 begin to move in a circular manner. The multiple groups of flexible guard plates 12 are attached to the outside of the coal rock sample and begin to moderately compress the multiple groups of springs 11. The multiple groups of springs 11 generate elastic potential energy prestress. The coal rock sample is placed on the tray 15, which effectively fixes the coal rock sample and plays a shock-absorbing role to prevent excessive pressure from affecting subsequent test results.

[0042] A gas container cylinder 17 is fixedly connected above the test bench 1. The staff injects the required gas into the gas container cylinder 17 through the gas feed port 22 set on the top of the gas container cylinder 17. The bottom of the gas container cylinder 17 is fixedly connected to the flow meter 18 through a conduit. The lower side of the flow meter 18 is fixedly connected to a pressure pump 19 through a conduit. The pressure pump 19 is fixedly installed above the test bench 1. The pressure pump 19 transmits the airflow inside the gas container cylinder 17 and applies the pressure required for the test. The pressurized airflow passes through the flow meter 18. The gas is partially transmitted to the inside of the gas outlet pipe 20 fixedly connected to the flow meter 18. The flow meter 18 records the air flow rate per unit time. The other end of the gas outlet pipe 20 is fixedly connected to the injection pipe 14. The injection pipe 14 is connected to the gas injection holes in the coal rock sample, so that the pressurized gas flow is transmitted to the inside of the coal rock sample for testing. The gas flow seeps out through the pores of the coal rock sample and is transmitted out by the gas outlet valve pipe 23 fixedly connected to the top of the test cylinder 2. The gas outlet valve pipe 23 transmits the gas flow to the inside of the measuring container 24, and the measuring container 24 detects and analyzes the seepage.

[0043] Example 2

[0044] like Figures 1-6As shown, a fixing rod 21 is fixedly connected to the upper side of the test bench 1 close to the test cylinder 2 , and the fixing rod 21 is fixedly connected to the test cylinder 2 .

[0045] A side plate 25 is movably connected to a side of the test cylinder 2 away from the measuring container 24 , and a pull rod 26 is fixedly connected to a side edge of the side plate 25 .

[0046] In this embodiment, a fixing rod 21 is fixedly connected above the test bench 1. There are multiple groups of fixing rods 21. The other ends of the multiple groups of fixing rods 21 are fixedly connected to the test cylinder 2, so that the test cylinder 2 can be stably fixed and installed above the test bench 1. A side plate 25 is movably connected to the side of the test cylinder 2. The staff can pull the pull rod 26 fixedly installed on the side of the side plate 25. The pull rod 26 will drive the side plate 25 to rotate outside the test cylinder 2, thereby opening the closed space inside the test cylinder 2. The staff can quickly replace the coal and rock samples, which is convenient for testing coal and rock samples of different properties.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A test device for the effect of coal rock desorption and seepage, comprising a test bench (1), characterized in that: A test cylinder (2) is provided above the test bench (1), a shock-absorbing fixing mechanism is provided outside the test cylinder (2), the shock-absorbing fixing mechanism comprises a driving motor (3) provided outside the test cylinder (2), a driving rod (4) is provided at the output end of the driving motor (3), a first gear (5) is fixedly connected to the side of the driving rod (4) away from the driving motor (3), a second gear (6) is meshedly connected to the side of the first gear (5), an arc groove (7) is uniformly provided inside the second gear (6) in a circumferential manner, a sliding rod (8) is slidably connected to the side of the arc groove (7), a slide plate (9) is fixedly connected below the slide plate (8), a mounting plate (10) is fixedly connected to the side of the slide plate (9) away from the slide plate (8), and a mounting plate (10) is fixed above the mounting plate (10). A spring (11) is fixedly connected, and a flexible guard plate (12) is fixedly connected to the side of the spring (11) away from the mounting plate (10). The slide plate (9), the mounting plate (10), the spring (11) and the flexible guard plate (12) are all arranged in a circular manner in multiple groups. After the drive motor (3) is started, it drives the first gear (5) to rotate through the drive rod (4). The first gear (5) drives the multiple groups of arc grooves (7) to rotate through the second gear (6). The arc groove (7) drives the slide plate (9) and the mounting plate (10) to move through the slide rod (8). The mounting plate (10) drives the flexible guard plate (12) to move through the spring (11). The spring (11) and the multiple groups of flexible guard plates (12) move toward the coal rock sample and are fixed for shock absorption.

2. The testing device for the effect of coal rock desorption and seepage according to claim 1, characterized in that: The test cylinder (2) is fixedly connected to the drive motor (3), the drive rod (4) is rotatably connected to the test cylinder (2), a convex plate (13) is rotatably connected below the second gear (6), the convex plate (13) is slidably connected to the slide plate (9), and an injection pipe (14) is rotatably connected to the side of the second gear (6) close to the convex plate (13).

3. The testing device for the effect of coal rock desorption and seepage according to claim 2, characterized in that: The injection tube (14) is fixedly connected to the test cylinder (2), and a tray (15) is fixedly connected to the side of the injection tube (14) away from the second gear (6).

4. The testing device for the effect of coal rock desorption and seepage according to claim 3, characterized in that: A heating tube (16) is provided above the interior of the test cylinder (2).

5. The testing device for the effect of coal rock desorption and seepage according to claim 2, characterized in that: A gas container barrel (17) is fixedly installed above the test bench (1), a flow meter (18) is provided on the side of the gas container barrel (17) away from the test bench (1), a pressure pump (19) is fixedly connected to the side of the flow meter (18) close to the test bench (1), the pressure pump (19) is fixedly installed above the test bench (1), an air outlet pipe (20) is fixedly connected to the side of the flow meter (18) away from the pressure pump (19), and the air outlet pipe (20) is fixedly connected to the injection pipe (14).

6. The testing device for the effect of coal rock desorption and seepage according to claim 1, characterized in that: A fixing rod (21) is fixedly connected to the upper side of the test bench (1) close to the test cylinder (2), and the fixing rod (21) is fixedly connected to the test cylinder (2).

7. The testing device for the effect of coal rock desorption and seepage according to claim 5, characterized in that: A gas feed port (22) is provided on the top of the gas container cylinder (17).

8. The testing device for the effect of coal rock desorption and seepage according to claim 1, characterized in that: The top of the test cylinder (2) is fixedly connected to an air outlet valve pipe (23), and a measuring container (24) is provided on the side of the test cylinder (2). The measuring container (24) and the air outlet valve pipe (23) are connected via a conduit.

9. The testing device for the effect of coal rock desorption and seepage according to claim 8, characterized in that: A side plate (25) is movably connected to a side of the test cylinder (2) away from the measuring container (24), and a pull rod (26) is fixedly connected to a side edge of the side plate (25).

10. The method for using the device for testing the effect of coal rock desorption and seepage according to claim 1, characterized in that: The following steps are involved: Step 1: Place the coal rock sample into the test tube (2), start the shock-absorbing fixing mechanism, and start the driving motor (3) in the shock-absorbing fixing mechanism to run. When the driving motor (3) runs, it controls the driving rod (4) to rotate; Step 2: When the driving rod (4) rotates, the first gear (5) is driven to start rotating. The first gear (5) utilizes the meshing connection relationship between the first gear (5) and the second gear (6) to drive the second gear (6) to rotate. When the second gear (6) rotates, the plurality of arc grooves (7) are rotated. When the plurality of arc grooves (7) rotate, the sliding rod (8) on the inner wall of the arc groove (7) is subjected to thrust. Step 3: The slide bar (8) moves along the inner wall of the arc groove (7), and when the slide bar (8) moves, the slide plate (9) starts to move, and when the slide plate (9) moves, the mounting plate (10) starts to move, and the slide plate (9) drives the spring (11) and the flexible guard plate (12) to move through the mounting plate (10); Step 4: Multiple groups of springs (11) and flexible protective plates (12) move in a surrounding manner, and the flexible protective plates (12) move to fit the outside of the coal rock sample. The springs (11) begin to be compressed and generate elastic potential energy prestress to fix and reduce shock on the coal rock sample.

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