Multi-stage filtering device for mine water treatment

Abstract

The invention belongs to the technical field of water treatment, and relates to a multistage filtering device for mine water treatment, which comprises a vertical cylinder and a horizontal cylinder communicated with each other, one end of the horizontal cylinder is closed, the outer side of the horizontal cylinder is provided with a first motor, a rotating shaft of the first motor extends into the horizontal cylinder and is fixedly connected with a filtering cylinder, the surface of the filtering cylinder is provided with filtering holes, and the filtering cylinder is communicated with the vertical cylinder. A cleaning roller is further arranged on the rotating shaft and located on the outer side of the filter cartridge, and the first motor drives the filter cartridge and the cleaning roller to rotate; an annular cleaning structure is arranged on the periphery of the filter cartridge and is in matched connection with a motor lead screw pair, and the motor lead screw pair drives the annular cleaning structure to move in the axial direction of the filter cartridge; a first filter plate and a second filter plate are arranged in the vertical cylinder from bottom to top at an interval, a flow guide structure is arranged above the second filter plate, and a limiting ring is arranged between the flow guide structure and the inner wall of the vertical cylinder. The multi-stage filtering device disclosed by the invention is good in filtering effect, and the overhaul and maintenance period is greatly prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment and relates to a multi-stage filtering device for mine water treatment. Background Art

[0002] During the coal mining process, groundwater comes into contact with coal seams and rock formations, and with the influence of human activities, a series of physical, chemical and biochemical reactions occur. As a result, the water quality has significant coal industry characteristics: the suspended matter (silt, gangue particles, coal powder, etc.) content of mine water is relatively high. If it is discharged directly, it will seriously pollute surface water, groundwater and soil, and destroy the ecological balance. In addition, if mine water is not treated, it will also have an adverse effect on some equipment and pipelines. After treatment, mine water can be used in underground spray dust reduction, equipment cooling, coal washing and other production links, reducing dependence on clean water sources and reducing mining costs. Therefore, driven by the multiple demands of environmental protection, resource recycling and safe production, mine water filtration and treatment is inevitable.

[0003] Since the content of suspended matter in mine water is much higher than that in surface water, the current treatment of mine water usually adopts a multi-stage filtration method so that the mine water can finally meet the discharge requirements or reuse requirements. The current multi-stage filtration method is to pass the mine water through a filter structure with gradually decreasing filter holes in sequence. However, as mentioned earlier, due to the large content of suspended matter in the mine, the primary filtration link undertakes the core task of intercepting large particles of impurities (such as coal gangue, silt, etc.). Since the primary filtration load is the largest, traditional designs generally face the following technical bottlenecks: the primary filtration structure (such as a flat filter) is in direct contact with high-concentration impurities, and the filter holes are easily blocked by large particles quickly, resulting in a surge in water flow resistance and a sharp drop in filtration efficiency. Some devices try to add dynamic cleaning structures (such as the scraper structure in CN222427307U), but after these cleaning tools have been running for a period of time, the gaps between the scrapers will gradually be filled with fine impurities, forming an "impurity compaction layer", which will become a new source of pollution, resulting in frequent blockage of the primary filtration section and failure of the cleaning structure, forcing frequent shutdowns for maintenance, which not only increases labor costs, but may also cause damage to downstream equipment in the water treatment system (such as pumps, valves, and precision filters) due to idling due to lack of water. Summary of the invention

[0004] The object of the present invention is to solve the above-mentioned problem and provide a multi-stage filtering device for mine water treatment.

[0005] To achieve the above-mentioned purpose, the present invention provides a multi-stage filtering device for mine water treatment, comprising a vertical cylinder and a horizontal cylinder connected to each other, wherein one end of the horizontal cylinder away from the vertical cylinder is closed and a first motor is arranged on the outside, the rotating shaft of the first motor extends into the horizontal cylinder and is fixedly connected to a filter cylinder, a filter hole is arranged on the surface of the filter cylinder, the filter cylinder is connected to the vertical cylinder, a cleaning roller is arranged on the rotating shaft, the cleaning roller is located on the outside of the filter cylinder, and the first motor drives the filter cylinder and the cleaning roller to rotate; An annular cleaning structure is provided on the outer periphery of the filter cartridge, and the annular cleaning structure is connected with a motor screw pair, and the motor screw pair drives the annular cleaning structure to move along the axial direction of the filter cartridge; A first filter plate and a second filter plate are arranged in the vertical cylinder from bottom to top. The first filter plate is located above the connection between the horizontal cylinder and the vertical cylinder. A guide structure is arranged above the second filter plate. A limiting ring is arranged between the guide structure and the inner wall of the vertical cylinder.

[0006] Furthermore, a water inlet and a debris discharge port are provided on the horizontal cylinder, and the debris discharge port is located below the cleaning roller; The horizontal cylinder has a connecting transition section which is connected to the vertical cylinder. One end of the filter cylinder close to the connecting transition section extends into the connecting transition section to form a discharge section which is connected to the vertical cylinder.

[0007] Further, the annular cleaning structure is respectively provided with a first connecting seat and a second connecting seat, the first connecting seat has a threaded hole, and the second connecting seat has a through hole; The motor screw pair includes a screw matched with the threaded hole, one end of the screw is rotatably connected to the inner wall of the horizontal cylinder, and the other end extends outside the horizontal cylinder and is connected to the second motor; A guide rod is arranged at the through hole, and two ends of the guide rod are respectively fixedly connected with the inner wall of the horizontal cylinder.

[0008] Furthermore, the annular cleaning structure has bristles, the cleaning roller has cleaning roller teeth, and the contact pressure between the bristles and the outer surface of the filter cartridge is 0.5-2N / cm².

[0009] Furthermore, a third motor is installed at the bottom of the vertical cylinder, and an output shaft of the third motor extends into the vertical cylinder and passes through the first filter plate and the second filter plate, and the output shaft is rotatably connected with the first filter plate and the second filter plate; Cleaning scrapers are respectively arranged on the upper and lower sides of the first filter plate and the upper and lower sides of the second filter plate. The cleaning scrapers are installed on the output shaft, and the output shaft drives the cleaning scrapers to rotate.

[0010] Furthermore, the flow guiding structure includes, from bottom to top, a vertical section, a contraction section, a second vertical section, and a second contraction section; The vertical section is fixedly connected to the inner wall of the vertical cylinder. A guide plate is arranged in the vertical section. There is a gap between the guide plate and the vertical section. The guide plate is fixedly connected to the contraction section through a connecting rod.

[0011] Furthermore, a limiting ring is fixed at the upper top of the vertical cylinder, and the lower end of the limiting ring is located outside the contraction section or the second vertical section. The interval between the guide structure and the limiting ring and the interval between the limiting ring and the inner wall of the vertical cylinder form a clean water channel. A drain outlet is provided on the vertical cylinder, and the drain outlet is connected to the clean water channel.

[0012] Furthermore, the vertical cylinder is also provided with a second row of miscellaneous openings, a third row of miscellaneous openings and a fourth row of miscellaneous openings. The second row of miscellaneous openings is located at the lower end of the vertical cylinder, the third row of miscellaneous openings is located on the upper side of the first filter plate and is adjacent to the first filter plate, and the fourth row of miscellaneous openings is located on the upper side of the second filter plate and is adjacent to the second filter plate.

[0013] Furthermore, control valves are provided at the impurity discharge port, the second impurity discharge port, the third impurity discharge port and the fourth impurity discharge port.

[0014] The beneficial effects of the present invention are as follows: 1. The multi-stage filtering device for treating mine water of the present invention, when filtering the mine water, the mine water enters the horizontal cylinder from the water inlet, enters the filter cylinder through the filter hole, and the large particle impurities are trapped outside the filter cylinder. The water entering the filter cylinder enters the vertical cylinder for further filtering. The annular cleaning structure can work periodically under the action of the motor screw pair, move axially along the outer surface of the filter cylinder, and clean the trapped impurities on the outer surface of the filter cylinder. When the annular cleaning structure moves to the cleaning roller, the cleaning roller can be used to clean the annular cleaning structure. In addition, when the annular cleaning structure moves for cleaning, the first motor drives the filter cylinder and the cleaning roller to rotate, thereby effectively improving the cleaning effect of the annular cleaning structure on the filter cylinder and the cleaning effect of the cleaning roller on the annular cleaning structure. Compared with the prior art, the multi-stage filtering device for treating mine water of the present invention, the filter cylinder as the primary filtering structure, is not prone to clogging problems, and the annular cleaning structure is not prone to secondary pollution problems. While greatly improving the filtering effect, it can also greatly extend the maintenance cycle.

[0015] 2. The multi-stage filtration device for mine water treatment of the present invention is provided with a first filter plate, a second filter plate and a guide structure in a vertical cylinder, and realizes coordinated filtration with a horizontal cylinder, which can effectively improve the uniformity and stability of water, is conducive to the sedimentation of impurities, and improves the purification quality of water discharged from the discharge port. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A perspective view schematically showing a multi-stage filtering device for treating mine water according to an embodiment of the present invention; Figure 2 A schematic front view of a multi-stage filtering device for treating mine water according to an embodiment of the present invention; Figure 3A schematic top view of a multi-stage filtration device for treating mine water according to an embodiment of the present invention; Figure 4 Schematic representation Figure 3 Sectional view at AA; Figure 5 Schematic representation Figure 4 Enlarged view of part A in the middle; Figure 6 A schematic diagram of a three-dimensional structure of a horizontal cylinder according to an embodiment of the present invention is shown; Figure 7 A diagram schematically showing the cooperation between an annular cleaning structure and a motor lead screw pair according to an embodiment of the present invention; Figure 8 The figure schematically shows the structure of the first filter plate and the second filter plate according to one embodiment of the present invention.

[0017] The meanings of the symbols in the accompanying drawings are as follows: 1. Vertical cylinder; 2. Horizontal cylinder; 3. First motor; 4. Rotating shaft; 5. Filter cylinder; 51. Filter hole; 6. Cleaning roller; 7. Annular cleaning structure; 8. Motor screw pair; 9. First filter plate; 10. Second filter plate; 11. Guide structure; 12. Limiting ring; 21. Water inlet; 22. Discharge outlet; 23. Connecting transition section; 52. Discharge section; 71. First connecting seat; 72. Second connecting seat; 81. Screw; 82. Second motor; 83. Guide rod; 73. Brush; 61. Cleaning roller teeth; 13. Third motor; 14. Output shaft; 15. Cleaning scraper; 111. Vertical section; 112. Contraction section; 113. Second vertical section; 114. Second contraction section; 115. Guide plate; 16. Discharge outlet; 17. Second discharge outlet; 18. Third discharge outlet; 19. Fourth discharge outlet. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0020] Combination Figure 1-Figure 8 As shown, the present invention provides a multi-stage filtering device for treating mine water, comprising a vertical cylinder 1 and a horizontal cylinder 2 connected to each other, wherein the horizontal cylinder 2 is away from one end of the vertical cylinder 1 ( Figure 2The left end is closed and a first motor 3 is provided on the outside. The rotating shaft 4 of the first motor 3 extends into the horizontal cylinder 2 and is fixedly connected to a filter cylinder 5. A filter hole 51 is provided on the surface of the filter cylinder 5. The filter cylinder 5 is connected to the vertical cylinder 1.

[0021] In this embodiment, the horizontal cylinder 2 is provided with a water inlet 21 and a debris outlet 22. Mine water enters the horizontal cylinder 2 through the water inlet 21, and then enters the filter cylinder 5 through the filter hole 51. Large particles of impurities are trapped outside the filter cylinder 5. The horizontal cylinder 2 has a connecting transition section 23, which is connected to the vertical cylinder 1. The filter cylinder 5 is close to one end of the connecting transition section 23 ( Figure 4 The right end (as shown) extends into the connecting transition section 23 to form a discharge section 52, and the discharge section 52 is connected to the vertical cylinder 1.

[0022] According to one embodiment of the present invention, a cleaning roller 6 is also provided on the rotating shaft 4, and the cleaning roller 6 is located outside the filter cylinder 5, and the impurity discharge port 22 is located below the cleaning roller 6. The first motor 3 drives the filter cylinder 5 and the cleaning roller 6 to rotate. An annular cleaning structure 7 is provided on the outer periphery of the filter cylinder 5, and the annular cleaning structure 7 has bristles 73, and the contact pressure between the bristles 73 and the outer surface of the filter cylinder 5 is 0.5-2N / cm². The annular cleaning structure 7 is connected with a motor screw pair 8, and the motor screw pair 8 drives the annular cleaning structure 7 to move along the axial direction of the filter cylinder 5, and can move to the cleaning roller 6. The cleaning roller 6 has cleaning roller teeth 61, which can clean the bristles 73. Specifically, the annular cleaning structure 7 is respectively provided with a first connecting seat 71 and a second connecting seat 72, and the first connecting seat 71 has a threaded hole. The motor screw pair 8 includes a screw 81 matched with the threaded hole, and one end of the screw 81 is rotatably connected to the inner wall of the horizontal cylinder 2, and the other end extends outside the horizontal cylinder 2 and is connected to the second motor 82. The second connecting seat 72 has a through hole, and a guide rod 83 is provided at the through hole. Both ends of the guide rod 83 are fixedly connected to the inner wall of the horizontal tube 2 respectively.

[0023] In the multi-stage filtering device for treating mine water of the present invention, when filtering the mine water, the mine water enters the horizontal cylinder 2 from the water inlet 21, enters the filter cylinder 5 through the filter hole 51, and the large particles of impurities are trapped outside the filter cylinder 5. The water entering the filter cylinder 5 enters the vertical cylinder 1 to continue filtering. The annular cleaning structure 7 can be periodically moved axially along the outer surface of the filter cylinder 5 under the action of the motor screw pair 8 to clean the trapped impurities on the outer surface of the filter cylinder 5. When the annular cleaning structure 7 moves to the cleaning roller 6, the cleaning roller 6 can be used to clean the annular cleaning structure 7. In addition, when the annular cleaning structure 7 moves for cleaning, the first motor 3 drives the filter cylinder 5 and the cleaning roller 6 to rotate, thereby effectively improving the cleaning effect of the annular cleaning structure 7 on the filter cylinder 5 and the cleaning effect of the cleaning roller 6 on the annular cleaning structure 7. Compared with the prior art, in the multi-stage filtration device for mine water treatment of the present invention, the filter cartridge 5 is used as a primary filtration structure, which is not prone to clogging problems. At the same time, the annular cleaning structure 7 is not prone to secondary pollution problems. While greatly improving the filtration efficiency, it can also greatly extend the maintenance cycle.

[0024] In the multi-stage filtering device for treating mine water of the present invention, a first filter plate 9 and a second filter plate 10 are arranged in a vertical cylinder 1 from bottom to top, the filter mesh aperture of the first filter plate 9 is larger than the filter mesh aperture of the second filter plate 10, and the mesh aperture of the first filter plate 9 is 0.5-1mm, and the mesh aperture of the second filter plate 10 is 0.1-0.3mm. The first filter plate 9 is located above the connection between the horizontal cylinder 2 and the vertical cylinder 1.

[0025] The vertical cylinder 1 is also provided with a second impurity discharge port 17, a third impurity discharge port 18 and a fourth impurity discharge port 19. The second impurity discharge port 17 is located at the lower end of the vertical cylinder 1, the third impurity discharge port 18 is located on the upper side of the first filter plate 9 and is arranged adjacent to the first filter plate 9, and the fourth impurity discharge port 19 is located on the upper side of the second filter plate 10 and is arranged adjacent to the second filter plate 10. Control valves are provided at the impurity discharge port 22, the second impurity discharge port 17, the third impurity discharge port 18 and the fourth impurity discharge port 19.

[0026] According to one embodiment of the present invention, a third motor 13 is installed at the bottom of the vertical cylinder 1, and the output shaft 14 of the third motor 13 extends into the vertical cylinder 1 and passes through the first filter plate 9 and the second filter plate 10, and the output shaft 14 is rotatably connected with the first filter plate 9 and the second filter plate 10. Cleaning scrapers 15 are respectively provided on the upper and lower sides of the first filter plate 9 and the upper and lower sides of the second filter plate 10, and the cleaning scrapers 15 are installed on the output shaft 14, and the output shaft 14 drives the cleaning scrapers 15 to rotate. In this way, the first filter plate 9 and the second filter plate 10 can be effectively cleaned to avoid clogging problems and improve the filtering effect.

[0027] like Figure 4As shown, in this embodiment, a guide structure 11 is provided above the second filter plate 10, and a limit ring 12 is provided between the guide structure 11 and the inner wall of the vertical cylinder 1. The guide structure 11 includes a vertical section 111, a contraction section 112, a second vertical section 113 and a second contraction section 114 from bottom to top. The vertical section 111 is fixedly connected to the inner wall of the vertical cylinder 1, and a guide plate 115 is provided in the vertical section 111. There is a gap between the guide plate 115 and the vertical section 111, and the guide plate 115 is fixedly connected to the contraction section 112 through a connecting rod. The limiting ring 12 is fixed to the top of the vertical cylinder 1, and the lower end of the limiting ring 12 is located outside the contraction section 112 or the second vertical section 113. The interval between the flow-guiding structure 11 and the limiting ring 12 and the interval between the limiting ring 12 and the inner wall of the vertical cylinder 1 form a clean water channel, and the interval between the flow-guiding structure 11 and the limiting ring 12 is greater than the interval between the limiting ring 12 and the inner wall of the vertical cylinder 1. A drain port 16 is provided on the vertical cylinder 1, and the drain port 16 is connected to the clean water channel.

[0028] The working principle of the multi-stage filtration device for mine water treatment of the present invention is as follows: The mine water enters the horizontal cylinder 2 from the water inlet 21, and enters the filter cylinder 5 through the filter hole 51. Large particles of impurities are trapped outside the filter cylinder 5. The water in the filter cylinder 5 further enters the vertical cylinder 1 through the discharge section 52 and is located below the first filter plate 9. As the water level rises, it continues to move upward through the filtering effect of the first filter plate 9, and then continues to move upward through the filtering effect of the second filter plate 10. Then it enters the contraction section 112, the second vertical section 113 and the second contraction section 114 along the vertical section 111, and finally enters the gap between the limit ring 12 and the guide structure 11, and then enters the gap between the limit ring 12 and the vertical cylinder 1, and is discharged from the drain port 16. During the filtering process, the second motor 82 drives the annular cleaning structure 7 to move along the filter cylinder 5 according to the set cycle, and at the same time, the first motor 3 drives the filter cylinder 5 and the cleaning roller 6 to rotate, thereby improving the cleaning effect of the filter cylinder 5 and the annular cleaning structure 7. In the vertical cylinder 1 , the third motor 13 works to drive the cleaning scraper 15 to rotate, thereby cleaning the first filter plate 9 and the second filter plate 10 .

[0029] The multi-stage filtering device for mine water treatment of the present invention realizes multi-stage filtering and improves filtering effect through the arrangement of the horizontal cylinder 2, the filter cylinder 5, the vertical cylinder 1, the first filter plate 9, the second filter plate 10 and the flow guide structure 11. The arrangement of the filter cylinder 5, the cleaning roller 6 and the annular cleaning structure 7 can realize a benign treatment method of filtering-cleaning-self-maintenance in the primary filtering stage, and can effectively deal with the core task of intercepting large particles of impurities (such as coal gangue, mud and sand, etc.) in the primary filtering link of mine water treatment, avoid clogging problems, improve filtering effect, and extend the shutdown maintenance cycle.

[0030] The multi-stage filtering device for mine water treatment of the present invention is provided with a first filter plate 9, a second filter plate 10 and a guide structure 11 in a vertical cylinder 1, which can effectively improve the uniformity and stability of water, facilitate the sedimentation of impurities, and improve the purification quality of water discharged from the drain outlet 16.

[0031] The above is only one embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-stage filtration device for mine water treatment, characterized in that: The invention comprises a vertical cylinder (1) and a horizontal cylinder (2) which are connected to each other. One end of the horizontal cylinder (2) which is away from the vertical cylinder (1) is closed and a first motor (3) is arranged on the outside. The rotating shaft (4) of the first motor (3) extends into the horizontal cylinder (2) and is fixedly connected to a filter cylinder (5). The surface of the filter cylinder (5) is provided with filter holes (51). The filter cylinder (5) is connected to the vertical cylinder (1). A cleaning roller (6) is also arranged on the rotating shaft (4). The cleaning roller (6) is located on the outside of the filter cylinder (5). The first motor (3) drives the filter cylinder (5) and the cleaning roller (6) to rotate. An annular cleaning structure (7) is provided on the outer periphery of the filter cartridge (5); the annular cleaning structure (7) is cooperatively connected to a motor screw pair (8); the motor screw pair (8) drives the annular cleaning structure (7) to move axially along the filter cartridge (5); A first filter plate (9) and a second filter plate (10) are arranged in a spaced relationship from bottom to top inside the vertical cylinder (1); the first filter plate (9) is located above the connection between the horizontal cylinder (2) and the vertical cylinder (1); a flow guide structure (11) is provided above the second filter plate (10); and a limiting ring (12) is provided between the flow guide structure (11) and the inner wall of the vertical cylinder (1).

2. The multi-stage filtration device for mine water treatment according to claim 1, characterized in that: The horizontal cylinder (2) is provided with a water inlet (21) and a debris discharge port (22), and the debris discharge port (22) is located below the cleaning roller (6); The horizontal cylinder (2) has a connecting transition section (23), the connecting transition section (23) is connected to the vertical cylinder (1), and one end of the filter cylinder (5) close to the connecting transition section (23) extends into the connecting transition section (23) to form a discharge section (52), and the discharge section (52) is connected to the vertical cylinder (1).

3. The multi-stage filtration device for mine water treatment according to claim 2, characterized in that: The annular cleaning structure (7) is provided with a first connecting seat (71) and a second connecting seat (72), the first connecting seat (71) having a threaded hole, and the second connecting seat (72) having a through hole; The motor screw pair (8) comprises a screw (81) matched with the threaded hole, one end of the screw (81) is rotatably connected to the inner wall of the horizontal cylinder (2), and the other end extends outside the horizontal cylinder (2) and is connected to a second motor (82); A guide rod (83) is provided at the through hole, and both ends of the guide rod (83) are respectively fixedly connected to the inner wall of the horizontal cylinder (2).

4. The multi-stage filtration device for mine water treatment according to claim 3, characterized in that: The annular cleaning structure (7) has bristles (73), the cleaning roller (6) has cleaning roller teeth (61), and the contact pressure between the bristles (73) and the outer surface of the filter cartridge (5) is 0.5-2N / cm².

5. The multi-stage filtration device for mine water treatment according to claim 1 or 4, characterized in that: A third motor (13) is installed at the bottom of the vertical cylinder (1); an output shaft (14) of the third motor (13) extends into the vertical cylinder (1) and passes through the first filter plate (9) and the second filter plate (10); the output shaft (14) is rotatably connected to the first filter plate (9) and the second filter plate (10); Cleaning scrapers (15) are respectively provided on the upper and lower sides of the first filter plate (9) and the upper and lower sides of the second filter plate (10). The cleaning scrapers (15) are mounted on the output shaft (14). The output shaft (14) drives the cleaning scrapers (15) to rotate.

6. The multi-stage filtration device for mine water treatment according to claim 5, characterized in that: The flow guiding structure (11) comprises, from bottom to top, a vertical section (111), a contraction section (112), a second vertical section (113) and a second contraction section (114); The vertical section (111) is fixedly connected to the inner wall of the vertical cylinder (1), a guide plate (115) is provided in the vertical section (111), a gap is provided between the guide plate (115) and the vertical section (111), and the guide plate (115) is fixedly connected to the contraction section (112) via a connecting rod.

7. The multi-stage filtration device for mine water treatment according to claim 6, characterized in that: A limiting ring (12) is fixed to the upper top of the vertical cylinder (1); the lower end of the limiting ring (12) is located outside the contraction section (112) or the second vertical section (113); the interval between the flow guide structure (11) and the limiting ring (12) and the interval between the limiting ring (12) and the inner wall of the vertical cylinder (1) form a clean water channel; a drain outlet (16) is provided on the vertical cylinder (1); and the drain outlet (16) is connected to the clean water channel.

8. The multi-stage filtration device for mine water treatment according to claim 7, characterized in that: The vertical cylinder (1) is further provided with a second row of impurity openings (17), a third row of impurity openings (18) and a fourth row of impurity openings (19); the second row of impurity openings (17) is located at the lower end of the vertical cylinder (1), the third row of impurity openings (18) is located on the upper side of the first filter plate (9) and is arranged adjacent to the first filter plate (9), and the fourth row of impurity openings (19) is located on the upper side of the second filter plate (10) and is arranged adjacent to the second filter plate (10).

9. The multi-stage filtration device for mine water treatment according to claim 8, characterized in that: Control valves are provided at the impurity discharge port (22), the second impurity discharge port (17), the third impurity discharge port (18) and the fourth impurity discharge port (19).

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