A sampling device for detecting underground water in a coal mine

Abstract

The application discloses a sampling device for coal mine underground water detection and relates to the technical field of coal mine underground water detection.The sampling device comprises a wire collector and a water taking container, the top end of the water taking container is connected with the wire collector through a connecting line, the connecting line is wound outside the wire collector, and a water inlet base is embeddedly arranged at the bottom end of the water taking container.The application can increase the internal space of the water taking container by discharging the gas in the expanded air bag, change the liquid flowing into the water taking container according to the increased space of the water taking container, and make the water taking container in a negative pressure state when the air bag is contracted, so that the liquid is more easily introduced into the water taking container.The air bag in the expanded state is used for reducing the space in the water taking container, and after the water taking container is taken out of the mine water, the air bag is expanded to make the space in the water taking container smaller, so that the liquid in the water taking container is quickly discharged.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine groundwater detection, in particular to a sampling device for coal mine groundwater detection. Background Art

[0002] Coal mine groundwater testing and sampling is a very important task, which helps to ensure water quality safety and environmental protection in the coal mine production process. The items to be measured are determined according to different testing requirements, such as heavy metal ions, organic pollutants, suspended solids, etc. The required sampling tools and equipment are prepared during the test, such as sampling buckets, samplers, filters, containers, etc., and groundwater is tested through samplers. Specifically, special groundwater samplers, such as pump samplers or manual samplers, are used to take samples from a specified depth. Coal mine groundwater testing and sampling must be carried out in strict accordance with relevant standards and operating procedures to ensure the accuracy and reliability of the test results.

[0003] It should be noted that when testing groundwater in coal mines, sampling needs to be carried out through a sampler to collect some water sources in the mine. Since the sampler is a container with a smaller opening during sampling, the air inside the container needs to be discharged before the liquid can flow in when the liquid enters the container, thereby slowing down the speed at which the liquid enters the container. In the process of lifting the sampler out of the water, it is easy to cause some liquid to leak from the water collection container. In addition, when the sample is taken, the liquid needs to be discharged from the sampler. The container with a smaller opening makes the outflow of liquid slower. When collecting liquid, the capacity inside the sampler cannot be changed according to needs. The only way is to measure the required amount of water again after collecting the liquid, which is more troublesome. Summary of the Invention

[0004] The purpose of the present invention is to provide a sampling device for coal mine groundwater detection to solve the problem raised in the above background technology: the sampler is a container with a small opening. When the liquid enters the container, the air inside the container needs to be discharged before the liquid can flow in, thereby slowing down the speed of the liquid entering the container. In the process of lifting the sampler out of the water, it is easy to cause part of the liquid to leak from the water container. In addition, when the sample is taken, the liquid needs to be discharged from the sampler, and the container with a small opening makes the outflow of liquid relatively slow.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A sampling device for detecting underground water in a coal mine comprises a wire take-up device and a water collection container, wherein the top of the water collection container is connected to the wire take-up device via a connecting wire, and the connecting wire is wound around the outside of the wire take-up device, a water inlet base is embedded in the bottom of the water collection container, a water volume control mechanism is provided inside the water collection container and above the water inlet base, the water volume control mechanism comprises a fixed base, the fixed base is provided at the lower end of the inner part of the water inlet base, and a first air pump and a second air pump are provided on the cylindrical surface of the fixed base, the air outlet of the first air pump and the second air pump are provided. The air inlets of the pumps are connected to the interior of the fixed base, and the first air pump and the second air pump are both installed on the cylindrical surface of the water intake container. An airbag is provided at the top of the fixed base, and the airbag is arranged vertically inside the water intake container. The expanded and contracted states of the airbag are used to control the amount of water in the water intake container. A fixed ring is welded to the cylindrical surface of the fixed base, and two connecting rods are welded to the inside of the fixed ring. Several movable rings are provided between the two connecting rods, and the inside of the movable ring is slidably connected to the connecting rod, and the airbag is connected to the inside of each movable ring.

[0007] As a preferred technical solution of the present invention, connecting holes are opened on both sides of the movable ring, two connecting rods are respectively located inside the two connecting holes, and the tops of the two connecting rods are provided with first telescopic springs, which are located on the upper surface of the uppermost movable ring.

[0008] As a preferred technical solution of the present invention, a fixing ring is welded to the top of the two connecting rods, and the diameter of the fixing ring is larger than the diameter of the first telescopic spring. The length of the first telescopic spring is adapted to the length of the connecting rod, and the first telescopic spring is used to drive the movable ring and the airbag to move.

[0009] As a preferred technical solution of the present invention, when the airbag is in an expanded state, the air outlet of the first air pump supplies air to the airbag, and the air inlet of the second air pump stops working. The airbag in the expanded state is used to reduce the space in the water collection container.

[0010] As a preferred technical solution of the present invention, when the airbag is in a contracted state, the air outlet of the first air pump stops working, and the air inlet of the second air pump absorbs the gas in the airbag. The airbag in a contracted state is used to increase the space in the water collection container.

[0011] As a preferred technical solution of the present invention, a water inlet control structure is provided inside the water intake container and below the fixed base, and the water inlet control structure includes a sliding sleeve, which is provided in the middle of the bottom end of the fixed base, and the sliding sleeve is slidably connected to the inside of the fixed base, and an intermediate seat is welded inside the water intake container and below the fixed base, a first lifting plate is provided on the top of the intermediate seat, and the shape of the first lifting plate is adapted to the shape of the intermediate seat, the first lifting plate is used to open and close the liquid channel in the water inlet base, a fixed rod is welded in the middle of the first lifting plate, a support plate is welded in the middle of the inside of the intermediate seat, the middle of the support plate is slidably connected to the fixed rod, and a second telescopic spring is provided on the outer sleeve of the fixed rod, and the second telescopic spring is used to move the first lifting plate upward.

[0012] As a preferred technical solution of the present invention, the first lifting plate and the sliding sleeve move synchronously, the second telescopic spring is located between the support plate and the first lifting plate, a reserved groove is opened inside the support plate, the reserved groove is slidably connected to the middle of the fixed rod, and the bottom end of the fixed rod is slidably connected to the bottom end of the water inlet base.

[0013] As a preferred technical solution of the present invention, the airbag in the contracted state is used to move the sliding sleeve upward, separating the middle seat from the first lifting plate, and the airbag in the expanded state is used to move the sliding sleeve downward, closing the middle seat from the first lifting plate.

[0014] As a preferred technical solution of the present invention, a coal cleaning structure is provided inside the water inlet base and at the bottom end of the fixed rod, the coal cleaning structure includes water holes, and the water holes are opened in a circle around the water inlet base. A second lifting plate is welded to the bottom end of the fixed rod, and the shape of the second lifting plate is adapted to the internal shape of the water inlet base. Fixed holes are provided on the edge of the second lifting plate and at positions corresponding to each water hole. A water column and a third telescopic spring are provided inside each fixed hole, and one end of the water column is located inside the fixed hole. The water column is used to clear the granular coal accumulated inside the water hole.

[0015] As a preferred technical solution of the present invention, the edge of the second lifting plate is slidably connected to the inside of the water inlet base, the shape of the water hole is truncated cone, and the tip shape of the water column is truncated cone, the water column slides inside the fixed hole, and the third telescopic spring is used to ensure that the water column is always in contact with each water hole.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] A water volume control mechanism is provided. By discharging the gas inside the inflated airbag, the internal space of the water collection container can be increased. The liquid flowing into the water collection container is changed according to the increased space of the water collection container. When the airbag is deflated, the water collection container is in a negative pressure state, which is more conducive to the liquid entering the water collection container.

[0018] The airbag in the expanded state is used to reduce the space in the water collection container. After the water collection container is taken out of the mine water, the airbag can be expanded to reduce the space in the water collection container, which is conducive to quickly draining the liquid in the water collection container;

[0019] A water inlet control structure is provided. The first lifting plate can only be moved upwards after the air inside the airbag is exhausted. At this time, the liquid in the mine flows into the water collection container. The opening and closing of the liquid flow channel is controlled by the expansion or contraction of the airbag. After the liquid is collected, the airbag can be inflated to close the first lifting plate and the middle seat to prevent the liquid from flowing out of the middle seat. The first lifting plate can only be opened by pushing the bottom end of the fixed rod;

[0020] A coal cleaning structure is provided. When the first lifting plate is raised or lowered, the water column on the second lifting plate can be driven up and down. The water column can clean the granular coal blocks remaining in the water holes to prevent the granular coal blocks from accumulating in the water holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a main structural diagram of a sampling device for detecting underground water in coal mines according to the present invention;

[0023] Figure 2 This is a schematic diagram of the interior of a water sampling container of a sampling device for detecting underground water in coal mines according to the present invention;

[0024] Figure 3 This is a schematic diagram of a water volume control mechanism of a sampling device for detecting underground water in coal mines according to the present invention;

[0025] Figure 4 This is a schematic diagram of a first air pump and a second air pump of a sampling device for detecting underground water in a coal mine according to the present invention;

[0026] Figure 5 This is a schematic diagram of a connection hole and a first telescopic spring of a sampling device for detecting groundwater in coal mines according to the present invention;

[0027] Figure 6 This is a schematic diagram of the air bag of a sampling device for detecting underground water in a coal mine according to the present invention in a collapsed state;

[0028] Figure 7This is a schematic diagram of the water inlet control structure of a sampling device for detecting groundwater in coal mines according to the present invention;

[0029] Figure 8 This is a schematic diagram of the opening of the first lifting plate of a sampling device for detecting groundwater in coal mines according to the present invention;

[0030] Figure 9 This is a schematic diagram of the coal cleaning structure of a sampling device for detecting groundwater in coal mines according to the present invention;

[0031] Figure 10 This is a schematic diagram of the third telescopic spring of a sampling device for detecting groundwater in coal mines according to the present invention.

[0032] In the figure: 1. Wire take-up device; 2. Connecting line; 3. Water collection container; 4. Water inlet base; 5. Water volume control mechanism; 6. Water inlet control structure; 7. Coal cleaning structure; 51. Fixed base; 52. First air pump; 53. Second air pump; 54. Air bag; 55. Movable ring; 56. Connecting hole; 57. Connecting rod; 58. First telescopic spring; 59. Fixed ring; 61. Middle seat; 62. Support plate; 63. Sliding sleeve; 64. First lifting plate; 65. Fixed rod; 66. Second telescopic spring; 67. Reserved groove; 71. Water-permeable hole; 72. Second lifting plate; 73. Water column; 74. Fixed hole; 75. Third telescopic spring. DETAILED DESCRIPTION

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention. Example 1:

[0034] See also Figures 1-6As shown, a sampling device for underground water detection in a coal mine comprises a wire take-up device 1 and a water collection container 3. The top of the water collection container 3 is connected to the wire take-up device 1 through a connecting wire 2, and the connecting wire 2 is wound around the outside of the wire take-up device 1. One end of the connecting wire 2 is connected to the water collection container 3, and the connecting wire 2 can be wound around the outside of the wire take-up device 1. A water inlet base 4 is embedded at the bottom of the water collection container 3. The water collection container 3 is immersed in the mine water source. The center of gravity of the water collection container 3 is located at the bottom of the water collection container 3, and the water source enters the water collection container 3 from the water inlet base 4 at the bottom of the water collection container 3. A water volume control device is provided inside the water collection container 3 and above the water inlet base 4. The water volume control mechanism 5 includes a fixed base 51, which is arranged at the lower end of the inner part of the water inlet base 4. The fixed base 51 does not affect the liquid at the bottom of the water intake container 3 flowing through the edge of the fixed base 51, and the cylindrical surface of the fixed base 51 is provided with a first air pump 52 and a second air pump 53, and the first air pump 52 and the second air pump 53 are both diaphragm pumps, which can be used for underwater work. The air outlet of the first air pump 52 and the air inlet of the second air pump 53 are both connected to the interior of the fixed base 51, and the first air pump 52 and the second air pump 53 are both installed on the cylindrical surface of the water intake container 3. The interior of the fixed base 51 is connected by two The pipe is screwed into the water intake container 3 and the fixed base 51, and the air outlet of the first air pump 52 is connected to one of the connecting pipes, and the air inlet of the second air pump 53 is connected to the other connecting pipe, so that the fixed base 51, the first air pump 52 and the second air pump 53 are all installed on the water intake container 3, and the power supply and connecting line 2 of the first air pump 52 and the second air pump 53 are all wound on the wire take-up device 1, which will not affect the operation of the first air pump 52 and the second air pump 53. An air bag 54 is provided at the top of the fixed base 51, and the air bag 54 is arranged in a vertical direction inside the water intake container 3, and the first air pump 52 and the second air pump 53 cooperate with each other to control the air The expansion state and contraction state of the airbag 54 are used to control the amount of water in the water collection container 3. A fixed ring 59 is welded to the cylindrical surface of the fixed base 51, and two connecting rods 57 are welded inside the fixed ring 59. Several movable rings 55 are arranged between the two connecting rods 57, and the interior of the movable ring 55 is slidably connected to the connecting rod 57, and the airbag 54 is connected to the interior of each movable ring 55. The airbag 54 expands or contracts to drive the movable ring 55 to move along the connecting rod 57. After the airbag 54 contracts, the internal capacity of the water collection container 3 can be increased, and after the airbag 54 expands, the internal capacity of the water collection container 3 can be reduced.

[0035] See also Figure 3-Figure 5As shown, connecting holes 56 are provided on both sides of the movable ring 55, and two connecting rods 57 are respectively located inside the two connecting holes 56. The connecting holes 56 of the movable ring 55 move along the connecting rods 57, so that the expansion or contraction of the airbag 54 can change the position of the movable ring 55 and the connecting rods 57. The top of the two connecting rods 57 is provided with a first telescopic spring 58, and the first telescopic spring 58 is located on the upper surface of the uppermost movable ring 55. The first telescopic spring 58 can move the uppermost movable ring 55, so that the first telescopic spring 58 can move the movable ring 55 when the airbag 54 contracts.

[0036] See also Figure 3 and Figure 5 As shown, a fixing ring is welded to the top of the two connecting rods 57, and the diameter of the fixing ring is larger than the diameter of the first telescopic spring 58. The length of the first telescopic spring 58 is adapted to the length of the connecting rod 57. The first telescopic spring 58 is used to drive the movable ring 55 and the airbag 54 to move. When the first telescopic spring 58 moves on the connecting rod 57, the fixing ring at the end of the connecting rod 57 is used to prevent the first telescopic spring 58 from falling off.

[0037] See also Figure 3 As shown, when the airbag 54 is in an expanded state, the air outlet of the first air pump 52 supplies air to the airbag 54, and the air inlet of the second air pump 53 stops working. The airbag 54 in the expanded state is used to reduce the space in the water intake container 3. When the water intake container 3 is not placed in the coal mine, air can be extracted through the air inlet of the first air pump 52, and the air outlet of the first air pump 52 supplies air to the airbag 54 to cause the airbag 54 to expand. At this time, the space in the water intake container 3 is adjusted, and the air in the water intake container 3 is discharged when it is not placed in water. After the water intake container 3 is placed in the mine, it is convenient to discharge the air in the water intake container 3.

[0038] See also Figure 6 As shown, when the airbag 54 is in a contracted state, the air outlet of the first air pump 52 stops working, and the air inlet of the second air pump 53 sucks the gas in the airbag 54. The airbag 54 in a contracted state is used to increase the space in the water collection container 3. The water collection container 3 is placed in the mine water source. Since there is air in the water collection container 3, the volume of the liquid that needs to flow into the water collection container 3 can be used to change the reduction of the airbag 54. Specifically, the air inlet of the second air pump 53 discharges the air inside the airbag 54. The movable ring 55 can be moved downward along the connecting rod 57 while the airbag 54 is contracted. The volume of the airbag 54 becomes smaller, which can increase the volume of the water collection container 3. At this time, the water source can be sucked into the water collection container 3 from the water inlet base 4, and the water source can enter the water collection container 3 more easily.

[0039] It should be noted that by discharging the internal gas of the inflated airbag 54, the internal space of the water collection container 3 can be increased. The liquid flowing into the water collection container 3 is changed according to the increased space of the water collection container 3, and when the airbag 54 contracts, the water collection container 3 is in a negative pressure state, which is more conducive to the liquid entering the water collection container 3. The airbag 54 in the inflated state is used to reduce the space in the water collection container 3. After the water collection container 3 is taken out of the mine water, the airbag 54 can be inflated to make the space in the water collection container 3 smaller, which is conducive to the rapid discharge of the liquid in the water collection container 3.

[0040] See also Figure 2 、 Figure 7 and Figure 8 As shown, a water inlet control structure 6 is provided inside the water collection container 3 and below the fixed base 51. The water inlet control structure 6 includes a sliding sleeve 63. The sliding sleeve 63 is provided in the middle of the bottom end of the fixed base 51, and the sliding sleeve 63 is slidably connected to the inside of the fixed base 51. A sealing ring is provided on the bottom end of the fixed base 51 and the outside of the sliding sleeve 63 to prevent liquid from entering the air bag 54 from the bottom end of the fixed base 51. When the air bag 54 is in a negative pressure state, the sliding sleeve 63 can be moved upward to a certain position. An intermediate seat 61 is welded inside the water collection container 3 and below the fixed base 51. A first lifting plate 64 is provided on the top of the intermediate seat 61, and the shape of the first lifting plate 64 is adapted to the shape of the intermediate seat 61. The sliding sleeve 63 and the first lifting plate 64 can be lifted and lowered together. The lowering plate 64 is used to open and close the liquid channel in the water inlet base 4. The first lifting plate 64 is raised to open the liquid channel in the water inlet base 4, and the first lifting plate 64 is lowered to close the liquid channel in the water inlet base 4. A fixing rod 65 is welded in the middle of the first lifting plate 64, and a support plate 62 is welded in the middle of the inner part of the middle seat 61. The middle of the support plate 62 is slidably connected to the fixing rod 65, and the outer sleeve of the fixing rod 65 is provided with a second telescopic spring 66. The second telescopic spring 66 is used to move the first lifting plate 64 upward. Since the airbag 54 is in a contracted state, the sliding sleeve 63 and the first lifting plate 64 can be moved upward, and the first lifting plate 64 and the sliding sleeve 63 will also be moved upward under the action of the second telescopic spring 66, so that the liquid can flow from the water inlet base 4 into the water collection container 3.

[0041] See also Figure 7 and Figure 8As shown, the first lifting plate 64 and the sliding sleeve 63 move synchronously, the second telescopic spring 66 is located between the support plate 62 and the first lifting plate 64, and a reserved groove 67 is provided inside the support plate 62. The reserved groove 67 is slidably connected to the middle of the fixing rod 65, and the bottom end of the fixing rod 65 is slidably connected to the bottom end of the water inlet base 4. When the airbag 54 contracts, the second telescopic spring 66 can lift the first lifting plate 64 upward, thereby connecting the air in the water collection container 3, and the water flow can enter the interior of the water collection container 3.

[0042] See also Figure 7 and Figure 8 As shown, the airbag 54 in the contracted state is used to move the sliding sleeve 63 upward, the middle seat 61 is separated from the first lifting plate 64, and the force of the airbag 54 in the contracted state is less than the force of the second telescopic spring 66, so that the sliding sleeve 63 and the first lifting plate 64 move upward, and the water flows from the water inlet base 4 into the water collection container 3. The airbag 54 in the expanded state is used to move the sliding sleeve 63 downward, the middle seat 61 is closed with the first lifting plate 64, and the airbag 54 expands so that the force of the airbag 54 is greater than the force of the second telescopic spring 66 acts as a force, so that the sliding sleeve 63 and the first lifting plate 64 move downward. The first lifting plate 64 can only be moved upward after the air in the airbag 54 is discharged. At this time, the liquid in the mine flows into the interior of the water collection container 3, and the opening and closing of the liquid flow channel is controlled by the expansion or contraction of the airbag 54. After the liquid is collected, the first lifting plate 64 and the middle seat 61 can be closed by expanding the airbag 54 to prevent the liquid from flowing out of the middle seat 61. The first lifting plate 64 can only be opened by pushing the bottom end of the fixing rod 65.

[0043] See also Figure 2 、 Figure 9 and Figure 10As shown, a coal cleaning structure 7 is provided inside the water inlet base 4 and at the bottom end of the fixing rod 65. The coal cleaning structure 7 includes water permeable holes 71. The water permeable holes 71 are opened in a circle around the water inlet base 4. The water permeable holes 71 are used to allow water outside the water collection container 3 and the water inlet base 4 to flow into the water collection container 3 and the water inlet base 4, so that sampling can be performed using the water collection container 3. A second lifting plate 72 is welded to the bottom end of the fixing rod 65. The shape of the second lifting plate 72 is adapted to the internal shape of the water inlet base 4. After the second lifting plate 72 is installed inside the water inlet base 4, the bottom end of the water inlet base 4 is welded. The edge of the second lifting plate 72 is located at the same position as the bottom end of the fixing rod 65. A fixing hole 74 is provided at a corresponding position of each water hole 71, and a water column 73 and a third telescopic spring 75 are provided inside each fixing hole 74. The third telescopic spring 75 is located inside the fixing hole 74, and one end of the water column 73 is located inside the fixing hole 74. The water column 73 is used to clear the granular coal accumulated inside the water hole 71. The second lifting plate 72 rises and falls synchronously with the fixing rod 65. When the second lifting plate 72 rises and falls, it can drive the water column 73 to rise and fall, so that the end of the water column 73 is movably connected to the inside of the water hole 71, and the end of the water column 73 can be used to clean some granular coal blocks remaining inside the water hole 71.

[0044] See also Figure 9 and Figure 10 As shown, the edge of the second lifting plate 72 is slidably connected to the inside of the water inlet base 4, the shape of the water hole 71 is a truncated cone, and the tip shape of the water column 73 is a truncated cone, and the water column 73 slides inside the fixed hole 74. The shapes of the water hole 71 and the water column 73 are conducive to the relative sliding of the water hole 71 and the water column 73. When the second lifting plate 72 is raised or lowered, the water hole 71 and the water column 73 are repeatedly in contact. The third telescopic spring 75 is used to ensure that the water column 73 is always in contact with each water hole 71. When the first lifting plate 64 is raised or lowered, it can drive the water column 73 on the second lifting plate 72 to rise and fall. The water column 73 can clean the granular coal blocks remaining in the water hole 71 to prevent the granular coal blocks from accumulating in the water hole 71.

[0045] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A sampling device for detecting underground water in a coal mine, comprising a wire take-up device (1) and a water collection container (3), wherein the top end of the water collection container (3) is connected to the wire take-up device (1) via a connecting wire (2), and the connecting wire (2) is wound around the outside of the wire take-up device (1), characterized in that: The bottom end of the water collection container (3) is embedded with a water inlet base (4), and a water volume control mechanism (5) is provided inside the water collection container (3) and above the water inlet base (4). The water volume control mechanism (5) includes a fixed base (51), which is provided at the lower end of the inside of the water inlet base (4), and a first air pump (52) and a second air pump (53) are provided on the cylindrical surface of the fixed base (51). The air outlet of the first air pump (52) and the air inlet of the second air pump (53) are both connected to the inside of the fixed base (51), and the first air pump (52) and the second air pump (53) are both installed on the water collection container (3). The cylindrical surface of the water container (3) is provided with an air bag (54) at the top of the fixed base (51), and the air bag (54) is arranged in a vertical direction inside the water collection container (3), and the expansion state and contraction state of the air bag (54) are used to control the amount of water in the water collection container (3), the cylindrical surface of the fixed base (51) is welded with a fixed ring (59), the interior of the fixed ring (59) is welded with two connecting rods (57), and a plurality of movable rings (55) are provided between the two connecting rods (57), and the interior of the movable ring (55) is slidably connected to the connecting rod (57), and the air bag (54) is connected to the interior of each movable ring (55); Both sides of the movable ring (55) are provided with connecting holes (56), and two connecting rods (57) are respectively located inside the two connecting holes (56). The top ends of the two connecting rods (57) are provided with first telescopic springs (58), and the first telescopic springs (58) are located on the upper surface of the uppermost movable ring (55); the top ends of the two connecting rods (57) are welded with fixing rings, and the diameter of the fixing rings is larger than the diameter of the first telescopic springs (58), and the length of the first telescopic springs (58) is adapted to the length of the connecting rods (57). The first telescopic springs (58) are used to drive the movable ring (55) and the airbag (54) to move; A water inlet control structure (6) is provided inside the water intake container (3) and below the fixed base (51). The water inlet control structure (6) includes a sliding sleeve (63). The sliding sleeve (63) is provided in the middle of the bottom end of the fixed base (51), and the sliding sleeve (63) is slidably connected to the inside of the fixed base (51). An intermediate seat (61) is welded inside the water intake container (3) and below the fixed base (51). A first lifting plate (64) is provided at the top end of the intermediate seat (61), and the shape of the first lifting plate (64) is adapted to the shape of the intermediate seat (61). The first lifting plate (64) is used to open and close the liquid channel in the water intake base (4). The shape of the first lifting plate (64) is adapted to the shape of the intermediate seat (61). A fixing rod (65) is welded in the middle, a support plate (62) is welded in the middle of the middle seat (61), the middle of the support plate (62) is slidably connected to the fixing rod (65), and a second telescopic spring (66) is sleeved on the outside of the fixing rod (65), and the second telescopic spring (66) is used to move the first lifting plate (64) upward; the first lifting plate (64) and the sliding sleeve (63) move synchronously, and the second telescopic spring (66) is located between the support plate (62) and the first lifting plate (64), and a reserved groove (67) is opened inside the support plate (62), and the reserved groove (67) is slidably connected to the middle of the fixing rod (65), and the bottom end of the fixing rod (65) is slidably connected to the bottom end of the water inlet base (4).

2. A sampling device for detecting underground water in coal mines according to claim 1, characterized in that: When the airbag (54) is in an expanded state, the air outlet of the first air pump (52) supplies air to the airbag (54), and the air inlet of the second air pump (53) stops working. The airbag (54) in the expanded state is used to reduce the space in the water collection container (3).

3. A sampling device for detecting underground water in coal mines according to claim 1, characterized in that: When the airbag (54) is in a contracted state, the air outlet of the first air pump (52) stops working, and the air inlet of the second air pump (53) absorbs the gas in the airbag (54). The airbag (54) in the contracted state is used to increase the space in the water collection container (3).

4. A sampling device for detecting underground water in coal mines according to claim 2 or 3, characterized in that: The airbag (54) in the contracted state is used to move the sliding sleeve (63) upward, and the middle seat (61) is separated from the first lifting plate (64); the airbag (54) in the expanded state is used to move the sliding sleeve (63) downward, and the middle seat (61) is closed to the first lifting plate (64).

5. A sampling device for detecting underground water in coal mines according to claim 4, characterized in that: A coal cleaning structure (7) is provided inside the water inlet base (4) and at the bottom end of the fixing rod (65). The coal cleaning structure (7) includes water holes (71). The water holes (71) are arranged around the water inlet base (4). A second lifting plate (72) is welded to the bottom end of the fixing rod (65). The shape of the second lifting plate (72) is adapted to the internal shape of the water inlet base (4). A fixing hole (74) is provided at the edge of the second lifting plate (72) and at a position corresponding to each water hole (71). A water column (73) and a third telescopic spring (75) are provided inside each fixing hole (74). One end of the water column (73) is located inside the fixing hole (74). The water column (73) is used to remove granular coal accumulated inside the water hole (71).

6. A sampling device for detecting underground water in coal mines according to claim 5, characterized in that: The edge of the second lifting plate (72) is slidably connected to the inside of the water inlet base (4); the water hole (71) is truncated cone-shaped, and the tip of the water column (73) is truncated cone-shaped; the water column (73) slides inside the fixing hole (74); and the third telescopic spring (75) is used to ensure that the water column (73) is always in contact with each water hole (71).

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