Multifunctional testing equipment for permeability resistance test of low-permeability coal rock medium

Abstract

The invention discloses multifunctional test equipment for a permeability test of a low-permeability coal rock medium. The multifunctional test equipment comprises a water inlet system, a test box body system, a water outlet system and a circulating water system which are arranged on a steel frame support, the water inlet system is connected with the test box body system, the water inlet system is used for supplying pressure-adjustable water into the test box body system so as to measure the permeability resistance of a coal sample, and the water outlet system is connected with the test box body system. The water outlet pressure of the water outlet system is adjustable so as to measure the permeability characteristics of the coal sample under different permeability pressure conditions, and the water circulating system is arranged between the water outlet system and the water inlet system; the method has the advantages that the anti-permeability strength, permeability coefficient and permeability of the low-permeability coal rock under the conditions of water head change, medium change, soaking time of the coal rock in water and the like can be quickly and accurately analyzed, and technical support is provided for scientific and safe coal mine construction and coal mining.

Description

Technical Field

[0001] The invention relates to the technical field of coal rock indoor experiments, in particular to multifunctional testing equipment for low-permeability coal rock medium anti-permeability tests. Background Art

[0002] my country's coal resources are relatively rich, but due to the significant differences in the geological characteristics of coal seams and the extremely complex hydrogeological conditions, coal mining faces huge technical challenges. During the construction and mining of coal mines, the excavation and transformation of surface and underground rock formations will change the surface runoff and groundwater flow field in the surrounding areas. In geological environments such as water-rich formations and water-bearing geological structures such as water-bearing faults, water seepage may occur. Mining coal seams may cause the relative impermeable layer between the coal mining area and the aquifer to become thinner or disappear, and the distance between the aquifer and the coal mining area will be reduced. Especially in the case of underwater coal mining, when the head difference increases and the hydraulic gradient increases, the coal seam may eventually be damaged by penetration under the action of changing water pressure and water immersion, and groundwater will flow into the coal mining area, causing casualties and property losses. Therefore, it has become an urgent problem to determine the permeability coefficient and permeability of coal rock, explore the anti-seepage strength of coal rock, and study what kind of penetration damage will occur in coal rock under water pressure and water immersion conditions. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a multifunctional testing device for low-permeability coal rock medium anti-permeability test, and the present invention can test the anti-permeability of coal rock medium.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a multifunctional test equipment for low-permeability coal rock medium anti-permeability test, comprising: a water inlet system, a test box system, a water outlet system and a circulating water system placed on a steel frame support (25); the water inlet system is connected to the test box system, the water inlet system is used to supply water with adjustable pressure into the test box system to measure the anti-permeability of the coal sample, the water outlet system is connected to the test box system, the water outlet pressure of the water outlet system is adjustable to measure the permeability characteristics of the coal sample under different permeability pressure conditions, and the circulating water system is arranged between the water outlet system and the water inlet system.

[0005] As a further improvement of the present invention, the test box system comprises a transparent box (14), a transparent box base (20), a transparent box base hydraulic rod (22), a transparent box base rotating shaft (24), a slide rail (23) and a cover plate (9); the transparent box (14) comprises a water inlet trough (40), a seepage trough (43) and a water outlet trough (41) connected in sequence; the cover plate (9) is provided with a cover plate handle (8), a cover plate sealing film water filling port (10) and a cover plate sealing film (11), and the cover plate sealing film water filling port (10) is connected to the cover plate sealing film (11); the side of the transparent box (14) is provided with a sealing film and a seepage trough side sealing film water filling port (18), and the bottom of the transparent box (14) is provided with a sealing film and a seepage trough bottom plate sealing film water filling port (21).

[0006] As a further improvement of the present invention, a water inlet trough mesh partition (13) is provided between the water inlet trough (40) and the seepage trough (43), and a water outlet trough mesh partition (15) is provided between the seepage trough (43) and the water outlet trough (41), so as to ensure that the water inlet end and the water outlet end present a planar seepage; the water inlet trough mesh partition (13) and the water outlet trough mesh partition (15) can be replaced with different apertures to prevent sample loss.

[0007] As a further improvement of the present invention, the water inlet trough (40) is provided with a water inlet trough sealing strip (12) at the upper end and a water inlet trough handle (19) at the side end; the water outlet trough (41) is provided with a water outlet trough sealing strip (16) at the upper end and a water outlet trough handle (17) at the side end.

[0008] As a further improvement of the present invention, the transparent box (14) is placed in a transparent box base (20), and a transparent box base hydraulic rod (22) and a transparent box base rotating shaft (24) are provided under the transparent box base (20), and the transparent box base hydraulic rod (22) is connected to a slide rail (23) to be suitable for setting the inclination angle of the transparent box (14).

[0009] As a further improvement of the present invention, the water inlet trough (40) is connected to the water inlet system, and the water outlet trough (41) is connected to the water outlet system.

[0010] As a further improvement of the present invention, the water inlet system comprises a first water inlet tank (1), a second water inlet tank (2), a water supply hose (3), a float valve (4), a hydraulic rod (5), a water inlet hose (6), a water inlet valve (7), a water inlet flow meter (42), a first laser rangefinder (37) and a water level controller (39); the water supply hose (3) is connected between the first water inlet tank (1) and the second water inlet tank (2); the float valve (4) is placed in the second water inlet tank (2) to ensure that the second water inlet tank (2) is in a stable state. The water head in the water tank (2) is constant; the hydraulic rod (5) extends in a vertical direction, and the second water inlet tank (2) can slide through the hydraulic rod (5) to adjust the water level of the second water inlet tank (2); the first laser rangefinder (37) is arranged at the bottom of the hydraulic rod and is used to measure the water level in the second water inlet tank (2); the water level controller (39) is arranged on the first water inlet tank (1) and is used to control the start and stop of the water pump (36); the water inlet hose (6) is provided with a water inlet valve (7) and a water inlet flow meter (42).

[0011] As a further improvement of the present invention, the water outlet system comprises a transparent box water outlet hose (27), a transparent box water outlet valve (28), a water outlet box (29), a water outlet box hydraulic rod (30), a water outlet flow meter (31), and a water outlet (32); the transparent box water outlet valve (28) is arranged on the water outlet hose (27); the water outlet hose (27) is connected to the water outlet box (29); the water outlet box hydraulic rod (30) is placed on the water outlet box (29); 9) The bottom extends in the vertical direction, and the water outlet box (29) can slide through the water outlet box hydraulic rod (30) to adjust the water level of the water outlet box (29); the second laser rangefinder is placed at the bottom of the water outlet box hydraulic rod (30) to measure the water level in the water outlet box (29); the water outlet (32) is connected to the water outlet box (29), the water outlet (32) is provided with a water outlet flow meter (30), and the water outlet (32) is connected to the circulating water system.

[0012] As a further improvement of the present invention, the circulating water system comprises a circulating water supply tank (33), a pre-filter (34), a circulating water supply hose (35), and a water pump (36); the circulating water supply tank (33) is connected to the water outlet (32), and a pre-filter (34) is provided in the circulating water supply tank (33) to ensure the purity of the circulating water; the pre-filter (34) is connected to the circulating water supply hose (35), and a water pump (36) is provided on the circulating water supply hose (35).

[0013] As a further improvement of the present invention, the circulating water supply tank (33) is used to store water flowing out of the water outlet system, and is pumped by the water pump (36) of the water inlet system to the first water inlet tank (1) for use, so as to be suitable for the circulation of water.

[0014] The multifunctional testing equipment for low-permeability coal rock medium anti-permeability test of the present invention studies the influence of water head change, medium change and the length of time coal rock is immersed in water on the anti-permeability strength, permeability coefficient and permeability of coal rock, and provides technical support for scientific and safe coal mine construction and coal seam mining.

[0015] The beneficial effects of the present invention are:

[0016] 1. Compared with the existing equipment that uses permeable stones to separate samples from the water inlet and outlet, the present invention modularizes the gauze partitions of the inlet and outlet troughs, and can more flexibly select gauze with suitable apertures. While separating the samples and preventing sample particles from flowing to the water inlet and outlet, it can better ensure the fluidity of water and reduce the impact on the measurement of sample permeability coefficient and permeability.

[0017] 2. The water supply tank (33) of the circulating water system of the present invention is the replenishment point and starting point of the test water. It is connected with the water inlet system and the water outlet system to ensure the recycling of the test water and save water resources.

[0018] 3. Compared with the existing equipment, the hydraulic rod, laser rangefinder and slide rail of the present invention are designed such that the hydraulic rod (5, 30) and laser rangefinder (37, 38) can accurately, flexibly and labor-savingly set the height of the second water inlet tank (2) and the water outlet tank (29), ensuring that the water head difference can be maintained at the set value. By setting the inclination angle of the base of the transparent box (14) through the hydraulic rod (22) and the slide rail (23), different inclination angles of the sample and different infiltration angles of water can be simulated, thereby increasing the conditions applicable to the test.

[0019] 4. Compared with the existing equipment, the design of the sealing film of the present invention can flexibly adjust the water pressure in the sealing film during the test to ensure that its outer surface always fits the sample surface, and ensure that water does not flow along the gap between the sample and the bottom plate of the box wall, while not excessively squeezing the sample, thereby reducing test errors.

[0020] 5. The water inlet trough sealing strip (12), the cover plate (9) and the water outlet trough sealing strip (16) of the present invention can be easily installed and disassembled so as to be applicable to two different test conditions: non-pressure-bearing and pressure-bearing.

[0021] 6. The present invention reads the data of the water inlet flow meter (42) to observe the situation of water infiltrating into the sample at the water inlet end, thereby reducing the waiting time caused by the inability or difficulty of water to infiltrate into the sample due to the unreasonable setting of the water head difference.

[0022] 7. The pre-filter (34) of the present invention can filter the test water to ensure that the test water is clean and can smoothly pass through various hoses, water pumps (36), and samples; the water level controller (39) controls the start and stop of the water pump (36), thereby extending the service life of the water pump (36) and saving electricity resources.

[0023] 8. The float valve (4) of the present invention can control whether the water inlet hose (3) supplies water to the second water inlet tank (2), thereby maintaining the water level in the water inlet tank at a fixed position. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view of the experimental test device in the embodiment of the present invention;

[0025] Figure 2 It is a side view of the bottom plate or side wall of the seepage trough of the test device in the embodiment of the present invention.

[0026] Reference numerals:

[0027] 1-first water inlet tank, 2-second water inlet tank, 3-water supply hose, 4-float valve, 5-hydraulic rod, 6-water inlet hose, 7-water inlet valve, 8-cover handle, 9-cover, 10-cover sealing film filling port, 11-cover sealing film, 12-water inlet tank sealing strip, 13-water inlet tank mesh partition, 14-transparent box, 15-water outlet tank mesh partition, 16-water outlet tank sealing strip, 17-water outlet tank handle, 18-seepage tank side sealing film filling port, 19-water inlet tank handle, 20-transparent box base, 21-seepage tank bottom plate sealing film filling port, 22-transparent Hydraulic rod of the exposed box base, 23-slide rail, 24-transparent box base rotating shaft, 25-steel frame support, 26-universal wheel, 27-transparent box water outlet hose, 28-transparent box water outlet valve, 29-water outlet tank, 30-water outlet tank hydraulic rod, 31-water outlet flow meter, 32-water outlet, 33-circulating water supply tank, 34-pre-filter, 35-circulating water supply hose, 36-water pump, 37-first laser rangefinder, 38-second laser rangefinder, 39-water level controller, 40-water inlet trough, 41-water outlet trough, 42-water inlet flow meter, 43-seepage trough. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] Example

[0030] like Figure 1 and Figure 2As shown, a multifunctional test device for low-permeability coal rock medium anti-permeability test comprises a circulating water system, a water inlet system, a test box system and a water outlet system. The four systems are arranged on a steel frame support (25). Two universal wheels (26) are installed at the bottom of the steel frame support (25). The circulating water system is connected to a water pump (36) through a pre-filter (34) and a circulating water supply hose (35). The water pump (36) is connected to a first water inlet tank (1) of the water inlet system. A water level controller (39) is located on the side wall of the first water inlet tank (1). The first water inlet tank (1) is connected to the second water inlet tank (1) through a water supply hose (3). The second water inlet tank (2) is connected to the test box system water inlet tank (40), the float valve (4) is located inside the second water inlet tank (2), the hydraulic rod (5) is located at the bottom of the second water inlet tank (2), the first laser rangefinder (37) is located at the bottom of the hydraulic rod (5), the second water inlet tank (2) is connected to the test box system water inlet tank (40) through the water inlet hose (6), the water inlet hose (6) is provided with a water inlet valve (7) and a water inlet flow meter (42), the top of the water inlet tank (40) is provided with a water inlet tank sealing strip (12), the water inlet tank (40) is separated from the seepage tank (43) by the water inlet tank mesh partition (13), and the transparent box The body (14) is placed on a transparent box base (20), the bottom of the transparent box base (20) is connected to a transparent box base hydraulic rod (22) and a transparent box base rotating shaft (24), the transparent box base hydraulic rod (22) is connected to a slide rail (23), a cover plate (9) is arranged on the top of the seepage groove (43), the cover plate (9) has a cover plate handle (8), a cover plate sealing film water filling port (10) and a cover plate sealing film (11), the front and rear side walls of the transparent box (14) have a transparent box side water filling port (18) and a sealing film, and the bottom plate of the transparent box (14) has a seepage groove bottom plate sealing film water filling port ( 21) and a sealing membrane, the seepage trough (43) is separated from the water outlet trough (41) by a water outlet trough mesh partition (15), the top of the water outlet trough (41) is provided with a water outlet trough (41) sealing strip (16), the water outlet trough (41) is connected to a water outlet box (29) of the water outlet system through a transparent box outlet hose (27), the transparent box outlet hose (27) is provided with a transparent box outlet valve (28), the bottom of the water outlet box (29) is connected to a water outlet box hydraulic rod (30), the water outlet (32) is connected to a circulating water supply box (33), and the water outlet (32) is provided with a water outlet flow meter (31).

[0031] The test equipment carries out the test through the following steps:

[0032] S1: Coal rock with a volume larger than the length and width of the seepage trough (43) of the test device is cut according to the length and width of the seepage trough (43) or small coal blocks and coal powder are uniformly mixed to prepare a test sample, and the mesh apertures of the water inlet trough mesh partition (13) and the water outlet trough mesh partition (15) are selected according to the minimum diameter of the sample particles, and the mesh partitions (13, 15) are inserted into the transparent box (14), and the sample is placed in the seepage trough (43);

[0033] S2: Filling water into the sealing film water filling ports (18, 21) on the front and rear side walls and the lower bottom plate of the seepage trough (43) so that the surface of the sealing film always fits the surface of the sample, thereby preventing water from flowing through the gap between the sample and the transparent box (14);

[0034] S3: Add test water to the water supply tank (33) of the circulating water system, close the water inlet valve (7) and the transparent box outlet valve (28), adjust the height of the water outlet tank (29) by means of the hydraulic rod (30) and the second laser rangefinder (38), so that the height of the water outlet (32) and the height of the sample at the position of the water outlet trough screen partition (15) are at the same horizontal plane, set as the water level of the water outlet tank (29), that is, the water outlet head, adjust the height of the second water inlet tank (2) by means of the hydraulic rod (5) and the first laser rangefinder (37), so that the horizontal plane where the float of the float valve (4) is located is 0.1m higher than the water level of the water outlet tank (29), set as the water level of the second water inlet tank (2), that is, the water inlet head, and set the inclination angle of the transparent box base by means of the hydraulic rod (22) and the slide rail (23);

[0035] S4: If the water inlet head is higher than the height of the top of the water inlet tank, it is also necessary to install a water inlet tank sealing strip (12) on the top of the water inlet tank (40), cover the top of the seepage tank (43) with a cover plate (9), and fill water through the water filling port (10) of the cover plate sealing film, so that the surface of the sealing film is in contact with the surface of the sample, and evenly place weights on the cover plate to ensure that the cover plate (9) always fits the sample;

[0036] S5: starting the water pump (36), passing water from the circulating water supply tank (33) through the pre-filter (34), filtering the particles in the water, and then transporting the water to the first water inlet tank (1) of the water inlet system. The first water inlet tank (1) is provided with a water level controller (39). When the water level in the first water inlet tank (1) is lower than half, the water level controller (39) controls the water pump (36) to operate, and stops operating after the first water inlet tank (1) is filled. The process of the water pump (36) supplying water to the first water inlet tank (1) is cyclically carried out;

[0037] S6: water from the first water inlet tank (1) enters the second water inlet tank (2) through the water supply hose (3). When the water reaches the height of the float valve (4), the float valve (4) controls the water supply hose (3) to stop supplying water. When the water level is lower than the set water level, the float valve (4) controls the water supply hose (3) to supply water. The process of the float valve (4) controlling the water supply hose (3) to supply water and stop supplying water is repeated;

[0038] S7: Open the water inlet valve (7) and the transparent box water outlet valve (28), and water enters the water inlet tank (40) from the second water inlet box (2) through the water inlet hose (6). The water infiltrates into the sample in a planar manner through the water inlet tank screen partition (13). Observe the water inlet flow meter (42). If the flow meter reading at a certain moment does not change compared with the flow meter reading 1 minute ago, adjust the height of the second water inlet tank (2) by the hydraulic rod (5) and the first laser rangefinder (37) to increase it by 0.1m.

[0039] S8: Repeat the test process of S4-S7 until water enters the water outlet tank (41). The water inlet head set when water first flows into the water outlet tank (41) is defined as h1, and the water outlet head is defined as h2. Water enters the water outlet tank (29) through the transparent box water outlet hose (27). When the water level reaches the water outlet (32), it flows out to the circulating water supply tank (33), completing the recycling of the test water. The water volume of the outlet water is measured and recorded by the water outlet flow meter (31);

[0040] S9: Read the water outlet flow meter (31) data Q1 and Q2 at time t1 and t2 (t2>t1). The flow meter reading is the total flow from the start of the test to a certain time point. Therefore, the flow from t1 to t2 is the difference between the flow meter readings at the two time points (Q2-Q1). The permeability coefficient and permeability of the sample are obtained according to the following formula:

[0041]

[0042] Where: K is the permeability coefficient of the sample, in m / s; t1 and t2 are the times for reading the flow meter data, Q1 is the flow meter data at t1, in m 3 ; Q2 is the flow meter data at time t2, unit: m 3 ; L is the distance between the inlet gauze partition (13) and the outlet gauze partition (15), in m; A is the area of ​​the outlet cross section, in m 2 ; H1 is the water inlet head, unit is m; H2 is the water outlet head, unit is m; k is the permeability of the sample, unit is m 2 ; η is the dynamic viscosity of water, unit is Pascal seconds (Pa·s); ρ is the density of the sample, unit is kg / m 3 ; g is the acceleration due to gravity, unit is m / s 2 .

[0043] S10: Define the water level change value as Δh, initial Δh = (h1-h2) / 2, measure the maximum impermeable head difference of the sample by dichotomy, the water head H1 is reduced by Δh / 2, and the new water head change value Δh 新=Δh / 2, after the water inlet head H1 drops to the set value, if the reading of the water inlet flow meter (42) remains unchanged for 1 minute, proceed to step S11; if the reading of the water inlet flow meter (42) changes within 1 minute, proceed to step S12;

[0044] S11: Inlet head H1 increases by Δh 新 / 2, Δh is assigned to Δh 新 / 2, the new head change value Δh 新 =Δh / 2, if the reading of the water inlet flow meter (42) remains unchanged for 1 minute, repeat step S11; if the reading of the water inlet flow meter (42) changes within 1 minute, proceed to step S12;

[0045] S12: Inlet head H1 decreases by Δh 新 / 2, Δh is assigned to Δh 新 / 2, the new head change value Δh 新 =Δh / 2, if the reading of the water inlet flow meter (42) remains unchanged for 1 minute, proceed to step S11; if the reading of the water inlet flow meter (42) changes within 1 minute, repeat step S12;

[0046] S13: After steps S10-S12, in order to accurately calculate the maximum impermeable head difference to centimeters, when Δh≦0.01m, if the reading of the water inlet flow meter (42) does not change for 1 minute, that is, no water infiltrates into the sample for 1 minute, the difference between H1 and H2 at this time is the maximum impermeable head difference of the sample; if the reading of the water inlet flow meter (42) changes within 1 minute, that is, water infiltrates into the sample within 1 minute, the difference between H1 and H2 minus 0.01m at this time is the maximum impermeable head difference of the sample;

[0047] S14: The height of the second water inlet tank (2) is adjusted by the hydraulic rod (5) and the first laser rangefinder (37), and H1 is set to the height of H2 plus the maximum impermeable water head difference of the sample. The test is continued for 7 days to observe whether water can penetrate through the sample into the water outlet tank (41). The water outlet flow meter (31) continuously records the flow rate. The permeability coefficient and permeability of the sample are calculated every 1 hour by step S9 to observe whether the permeability coefficient and permeability change. The influence of the constant water pressure and water immersion on the anti-permeability of the sample is analyzed. After 7 days, the steps S10-S13 are repeated to find the new maximum impermeable water head difference of the sample under the constant water pressure and water immersion.

[0048] S15: re-prepare the sample, perform steps S1-S13, and set H1 to the height of H2 plus the maximum impermeable head difference of the sample;

[0049] S16: Every 10 minutes, the height of the second water inlet tank (2) is adjusted by the hydraulic rod (5) and the first laser rangefinder (37) to increase by 0.1 m, and this continues for 120 minutes;

[0050] S17: Every 10 minutes, the height of the second water inlet tank (2) is adjusted by reducing it by 0.1 m through the hydraulic rod (5) and the first laser rangefinder (37), and this continues for 120 minutes;

[0051] S18: The test is performed by performing steps S16 and S17 once as one cycle, and the cycle is repeated 3 times. The test lasts for a total of 12 hours. Step 9 is performed to calculate the permeability coefficient and permeability of the sample, and their changes are observed. Steps S10-S13 are repeated to find the new maximum impermeable head difference of the sample under the action of short-term water pressure changes, and the influence of short-term water pressure changes on the anti-permeability of the sample is analyzed;

[0052] S19: Re-prepare the sample, perform steps S1-S13, and set H1 to the height of H2 plus the maximum impermeable head difference of the sample;

[0053] S20: Every 1 hour, the height of the second water inlet tank (2) is adjusted by the hydraulic rod (5) and the first laser rangefinder (37) to increase by 0.1 m, and this continues for 12 hours;

[0054] S21: Every 1 hour, the height of the second water inlet tank (2) is adjusted by reducing it by 0.1 m through the hydraulic rod (5) and the first laser rangefinder (37), and this continues for 12 hours;

[0055] S22: The test is performed with steps S20 and S21 as one cycle, and the cycle is repeated 7 times. The test lasts for 7 days in total. Step 9 is performed to calculate the permeability coefficient and permeability of the sample and observe their changes. Steps S10-S13 are repeated to find the new maximum impermeable head difference of the sample under the long-term changing water pressure and water immersion, and the influence of the long-term changing water pressure and water immersion on the anti-permeability of the sample is analyzed.

[0056] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A multifunctional testing equipment for low-permeability coal rock medium anti-permeability test, characterized in that: include: A water inlet system, a test box system, a water outlet system and a circulating water system are placed on a steel frame support (25); the water inlet system is connected to the test box system, the water inlet system is used to supply water with adjustable pressure to the test box system to measure the anti-permeability of the coal sample, the water outlet system is connected to the test box system, the water outlet pressure of the water outlet system is adjustable to measure the permeability characteristics of the coal sample under different permeability pressure conditions, and the circulating water system is arranged between the water outlet system and the water inlet system.

2. The multifunctional testing equipment for low-permeability coal rock medium anti-permeability test according to claim 1 is characterized in that: The test box system comprises a transparent box (14), a transparent box base (20), a transparent box base hydraulic rod (22), a transparent box base rotating shaft (24), a slide rail (23) and a cover plate (9); the transparent box (14) comprises a water inlet groove (40), a seepage groove (43) and a water outlet groove (41) connected in sequence; the cover plate (9) is provided with a cover plate handle (8), a cover plate sealing film water filling port (10) and a cover plate sealing film (11); the cover plate sealing film water filling port (10) is connected to the cover plate sealing film (11); the side of the transparent box (14) is provided with a sealing film and a seepage groove side sealing film water filling port (18); the bottom of the transparent box (14) is provided with a sealing film and a seepage groove bottom plate sealing film water filling port (21).

3. The multifunctional testing equipment for low-permeability coal rock medium anti-permeability test according to claim 2 is characterized in that: A water inlet gauze partition (13) is provided between the water inlet trough (40) and the seepage trough (43), and a water outlet gauze partition (15) is provided between the seepage trough (43) and the water outlet trough (41), so as to ensure that the water inlet end and the water outlet end present a planar seepage; the water inlet gauze partition (13) and the water outlet gauze partition (15) can be replaced with different apertures to prevent the loss of samples.

4. The multifunctional testing equipment for low-permeability coal rock medium anti-permeability test according to claim 3 is characterized in that: The water inlet trough (40) is provided with a water inlet trough sealing strip (12) at the upper end and a water inlet trough handle (19) at the side end; the water outlet trough (41) is provided with a water outlet trough sealing strip (16) at the upper end and a water outlet trough handle (17) at the side end.

5. The multifunctional testing equipment for low-permeability coal rock medium anti-permeability test according to claim 4 is characterized in that: The transparent box (14) is placed in a transparent box base (20), and a transparent box base hydraulic rod (22) and a transparent box base rotating shaft (24) are provided under the transparent box base (20). The transparent box base hydraulic rod (22) is connected to a slide rail (23) to be suitable for setting the inclination angle of the transparent box (14).

6. The multifunctional testing equipment for low-permeability coal rock medium anti-permeability test according to claim 4 is characterized in that: The water inlet trough (40) is connected to the water inlet system, and the water outlet trough (41) is connected to the water outlet system.

7. The multifunctional testing equipment for low-permeability coal and rock medium anti-permeability test according to claim 6 is characterized in that: The water inlet system comprises a first water inlet tank (1), a second water inlet tank (2), a water supply hose (3), a float valve (4), a hydraulic rod (5), a water inlet hose (6), a water inlet valve (7), a water inlet flow meter (42), a first laser rangefinder (37) and a water level controller (39); the water supply hose (3) is connected between the first water inlet tank (1) and the second water inlet tank (2); the float valve (4) is placed in the second water inlet tank (2) to ensure that the second water inlet tank (2) has a constant flow rate. The water head is constant; the hydraulic rod (5) extends in the vertical direction, and the second water inlet tank (2) can slide through the hydraulic rod (5) to adjust the water level of the second water inlet tank (2); the first laser rangefinder (37) is placed at the bottom of the hydraulic rod and is used to measure the water level in the second water inlet tank (2); the water level controller (39) is arranged on the first water inlet tank (1) and is used to control the start and stop of the water pump (36); the water inlet hose (6) is provided with a water inlet valve (7) and a water inlet flow meter (42).

8. The multifunctional testing equipment for low-permeability coal and rock medium anti-permeability test according to claim 6 is characterized in that: The water outlet system comprises a transparent box water outlet hose (27), a transparent box water outlet valve (28), a water outlet box (29), a water outlet box hydraulic rod (30), a water outlet flow meter (31), and a water outlet (32); the transparent box water outlet valve (28) is arranged on the water outlet hose (27); the water outlet hose (27) is connected to the water outlet box (29); the water outlet box hydraulic rod (30) is arranged at the bottom of the water outlet box (29) and extends in a vertical direction; the water outlet box (29) can slide through the water outlet box hydraulic rod (30) to adjust the water level of the water outlet box (29); the second laser rangefinder is arranged at the bottom of the water outlet box hydraulic rod (30) to measure the water level in the water outlet box (29); the water outlet (32) is connected to the water outlet box (29); the water outlet (32) is provided with a water outlet flow meter (30); and the water outlet (32) is connected to a circulating water system.

9. The multifunctional testing equipment for low-permeability coal and rock medium anti-permeability test according to claim 8, characterized in that: The circulating water system comprises a circulating water supply tank (33), a pre-filter (34), a circulating water supply hose (35), and a water pump (36); the circulating water supply tank (33) is connected to the water outlet (32), and a pre-filter (34) is provided in the circulating water supply tank (33) to ensure the purity of the circulating water; the pre-filter (34) is connected to the circulating water supply hose (35), and a water pump (36) is provided on the circulating water supply hose (35).

10. The multifunctional testing equipment for low-permeability coal rock medium anti-permeability test according to claim 9, characterized in that: The circulating water supply tank (33) is used to store water flowing out of the water outlet system, and is pumped by the water pump (36) of the water inlet system to the first water inlet tank (1) for use, so as to be suitable for the circulation of water.

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