A drainage device for water conservancy projects

Abstract

The present invention belongs to the technical field of water conservancy drainage and anti-blocking technology, and specifically discloses a water conservancy drainage device, including a drainage pipe, a diversion hood, a self-rotating cleaning primary filter mechanism, a secondary filter mechanism, and a spiral dredging device. Given that existing water conservancy drainage devices are unable to pre-separate debris from the water flow, a pre-centrifugal separation method with a large-diameter inlet and a small-diameter outlet is adopted to reduce the pressure of subsequent filtration and dredging. Given that existing water conservancy drainage devices are prone to clogging, a method is adopted in which a float is triggered to rise and rotate to self-clean the filter element, achieving the multiple technical effects of self-sensing cleaning and anti-blocking.

Description

Technical Field

[0001] The invention belongs to the technical field of drainage and anti-blocking of water conservancy projects, and specifically refers to a drainage device for water conservancy projects. Background Art

[0002] Drainage systems play a crucial role in water conservancy projects. This is especially true in river bank protection projects, where the pre-buried drainage pipe inlets are often exposed to the current and easily clogged by debris in the water (such as branches, leaves, silt, and garbage). Clogged drainage systems can lead to poor drainage, potentially causing problems such as waterlogging and ponding, disrupting the normal operation of water conservancy projects and potentially damaging the surrounding environment and facilities.

[0003] Traditional anti-clogging measures include filters, but these require regular cleaning and can quickly become clogged when contaminated by debris, leading to a sharp drop in drainage efficiency. While some mechanical drainage devices attempt to address the clogging problem, they still suffer from complex structures, low reliability, fragility, and poor performance at high flow rates. For example, some devices use rotating scrapers to clean the filter, but these scrapers can easily become stuck with larger debris and can fail under the impact of high-velocity water. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the existing technology, the present invention provides a water conservancy project drainage device. According to the situation that the existing water conservancy project drainage device is unable to pre-separate the debris in the water flow, a pre-centrifugal separation method with large diameter water inlet and small diameter water outlet is adopted to achieve the technical effect of pre-separation of large particles of debris, and reduce the pressure of subsequent filtration and dredging; according to the situation that the existing water conservancy project drainage device is prone to clogging, a float sensing rise triggering rotation method is adopted to self-clean the filter element, thereby achieving the multiple technical effects of self-sensing cleaning and anti-clogging.

[0005] The technical solution adopted by the present invention is as follows: The present invention provides a drainage device for a water conservancy project, including a drainage pipe, a diverter cover, a self-rotating cleaning primary filter mechanism, a secondary filter mechanism and a spiral dredging device. The diverter cover is engaged and rotated and disassembled and is arranged at the water inlet of the drainage pipe. The self-rotating cleaning primary filter mechanism is arranged in the drainage pipe. The secondary filter mechanism is arranged in the drainage pipe. The secondary filter mechanism is arranged downstream of the self-rotating cleaning primary filter mechanism. The spiral dredging device is arranged in the drainage pipe. The spiral dredging device is arranged downstream of the secondary filter mechanism; the self-rotating cleaning primary filter mechanism includes a hollow filter ball, a cleaning transmission part and an inductive floating part. The hollow filter ball is rotatably arranged in the drainage pipe. The cleaning transmission part is arranged in the hollow filter ball. The inductive floating part is sealingly and slidingly arranged on the drainage pipe, and the inductive floating part is connected to the cleaning transmission part.

[0006] Furthermore, the inductive floating part includes a lifting column, a limiting fitting arc plate and a floating ball. The lifting column passes through the drainage pipe and is connected to the cleaning transmission part. The floating ball is arranged at the upper end of the lifting column. The limiting fitting arc plate is arranged on the lifting column. The limiting fitting arc plate is movably fitted on the outer circumferential wall of the drainage pipe.

[0007] Preferably, the cleaning transmission member includes a cleaning rotating gear and a cleaning transmission rack, the cleaning rotating gear is arranged on the hollow filter ball, the cleaning transmission rack is meshed with the cleaning rotating gear, and the bottom end of the cleaning transmission rack is connected to the bottom end of the lifting column.

[0008] Furthermore, the diversion cover includes a truncated cone-shaped cover body, a spiral guide plate, an embedded plate and a snap-fit ​​fixing column, the spiral guide plate is spirally distributed along the inner circumferential wall of the truncated cone-shaped cover body, the embedded plate is arranged at the small-diameter port of the truncated cone-shaped cover body, and the snap-fit ​​fixing column is arranged on the circumferential side wall of the embedded plate.

[0009] Among them, the secondary filtration mechanism includes an inclined filter plate, an aggregate discharge pipe and a control valve plate. The inclined filter plate is arranged on the inner wall of the drainage pipe. The aggregate discharge pipe is connected to the drainage pipe. The aggregate discharge pipe is arranged between the self-rotating cleaning primary filtration mechanism and the inclined filter plate. The control valve plate is arranged in the aggregate discharge pipe.

[0010] Furthermore, the control valve plate includes a sealing and releasing plate, a rotating shaft and a control button. The sealing and releasing plate is arranged in a circular plate shape. The outer diameter of the sealing and releasing plate is adapted to the inner diameter of the aggregate discharge pipe and is used to seal the aggregate discharge pipe. The sealing and releasing plate is rotatably arranged in the aggregate discharge pipe. A through hole is provided on the side wall of the aggregate discharge pipe. One end of the rotating shaft is connected to the circumferential side wall of the sealing and releasing plate near the through hole through the through hole, and the control button is connected to the other end of the rotating shaft.

[0011] As a further preferred embodiment of the present invention, the spiral dredging device includes a dredging shaft, a spiral push piece and an inductive dredging drive component, the dredging shaft is rotatably arranged in the drainage pipe, the spiral push piece is arranged on the dredging shaft, and the inductive dredging drive component is arranged on the dredging shaft.

[0012] Furthermore, the inductive dredging drive component includes a dredging gear, a dredging rack, a floating column and a floating inductive ball. The dredging gear is arranged on the dredging shaft, the dredging rack is meshed and connected with the dredging gear, the floating column passes through the drainage pipe and is connected to the bottom end of the dredging rack, the floating inductive ball is arranged at the upper end of the floating column, and the floating inductive ball is arranged on the outside of the drainage pipe.

[0013] Wherein, a fitting limit plate is provided on the floating column, and the fitting limit plate is movably arranged on the outer circumferential wall of the drainage pipe, and the floating column is limited.

[0014] Furthermore, a snap groove is provided at the water inlet of the drainage pipe, the snap-fit ​​fixing column is snap-fitted in the snap groove, a fixed ring plate is provided on the inner wall of the drainage pipe, the hollow filter ball is rotatably provided on the fixed ring plate, the dredging shaft is rotatably provided on the fixed ring plate, a lifting hole is provided on the outer circumferential wall of the drainage pipe, the lifting column is telescopically arranged in the lifting hole, a floating hole is provided on the outer circumferential wall of the drainage pipe, and the floating column is telescopically arranged in the floating hole.

[0015] The beneficial effects achieved by the present invention using the above structure are as follows:

[0016] 1. The diversion cover and spiral guide plate structure can pre-separate large particles of debris, reducing the pressure of subsequent filtration and dredging. 2. The self-rotating cleaning primary filtration mechanism realizes the self-rotating cleaning and dredging of the hollow filter ball through the cooperation of floating balls, lifting columns, cleaning rotating gears and cleaning transmission racks. Compared with traditional manual cleaning filters or complex mechanical cleaning structures, it is simpler and more reliable, and can automatically start the cleaning and dredging function according to water level changes.

[0017] 3. The inclined filter plate structure in the secondary filtration mechanism can not only effectively filter debris, but also the aggregate discharge pipe facilitates the collection and cleaning of debris. Compared with the traditional flat filter structure, it has better debris handling capabilities;

[0018] 4. The spiral push piece of the spiral dredging device can generate axial thrust when rotating, and it can discharge the debris through the driving method of floating sensing ball and floating column. It has a simple structure and is easy to realize automatic control. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a water conservancy project drainage device proposed by the present invention;

[0020] Figure 2 This is a left view of a water conservancy project drainage device proposed by the present invention;

[0021] Figure 3 This is a front view of a water conservancy project drainage device proposed by the present invention;

[0022] Figure 4 This is a right side view of a water conservancy project drainage device proposed by the present invention;

[0023] Figure 5 This is a top view of a water conservancy project drainage device proposed by the present invention;

[0024] Figure 6 This is a bottom view of a water conservancy project drainage device proposed by the present invention;

[0025] Figure 7This is a cross-sectional view of a water conservancy project drainage device proposed by the present invention;

[0026] Figure 8 This is a structural diagram of the self-rotating cleaning primary filtering mechanism;

[0027] Figure 9 It is a structural diagram of the splitter cover;

[0028] Figure 10 It is a structural schematic diagram of the spiral dredging device;

[0029] Figure 11 This is a structural diagram of the drainage pipe;

[0030] Figure 12 A cross-sectional view of the drainage pipe.

[0031] Among them, 1. Drainage pipe, 2. Diversion cover, 3. Self-rotating cleaning primary filter mechanism, 4. Secondary filter mechanism, 5. Spiral dredging device, 6. Hollow filter ball, 7. Cleaning transmission parts, 8. Lifting column, 9. Limiting fitting arc plate, 10. Floating ball, 11. Cleaning rotating gear, 12. Cleaning transmission rack, 13. Cone-shaped cover, 14. Spiral guide plate, 15. Embedded plate, 16. Snap-fit ​​fixing column, 17. Inclined filter plate , 18. Aggregate discharge pipe, 19. Control valve plate, 20. Blocking release plate, 21. Rotating shaft, 22. Control button, 23. Dredging rotating shaft, 24. Spiral push piece, 25. Inductive dredging drive part, 26. Dredging gear, 27. Dredging rack, 28. Floating column, 29. Floating induction ball, 30. Fitting limit plate, 31. Buckle groove, 32. Fixed ring plate, 33. Lifting hole, 34. Floating hole, 35. Inductive floating part.

[0032] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0035] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 As shown, the present invention provides a drainage device for a water conservancy project, comprising a drainage pipe 1, a diverter hood 2, a self-rotating cleaning primary filtering mechanism 3, a secondary filtering mechanism 4 and a spiral dredging device 5. The diverter hood 2 is engaged and rotated and disassembled and is arranged at the water inlet of the drainage pipe 1. The self-rotating cleaning primary filtering mechanism 3 is arranged in the drainage pipe 1, the secondary filtering mechanism 4 is arranged in the drainage pipe 1, and the secondary filtering mechanism 4 is arranged downstream of the self-rotating cleaning primary filtering mechanism 3. The spiral dredging device 5 is arranged in the drainage pipe 1, and the spiral dredging device 5 is arranged downstream of the secondary filtering mechanism 4.

[0036] like Figure 1 、 Figure 8 、 Figure 9 、 Figure 11 、 Figure 12 As shown, a snap groove 31 is provided at the water inlet of the drainage pipe 1, and the snap-fit ​​fixing column 16 is snap-fitted in the snap groove 31. A fixed ring plate 32 is provided on the inner wall of the drainage pipe 1, and the hollow filter ball 6 is rotatably provided on the fixed ring plate 32. The dredging shaft 23 is rotatably provided on the fixed ring plate 32. A lifting hole 33 is provided on the outer circumferential wall of the drainage pipe 1, and the lifting column 8 is telescopically movably provided in the lifting hole 33. A floating hole 34 is provided on the outer circumferential wall of the drainage pipe 1, and the floating column 28 is telescopically movably provided in the floating hole 34.

[0037] like Figure 1 、 Figure 9 As shown, the diverter cover 2 includes a truncated cone-shaped cover body 13, a spiral guide plate 14, an embedded plate 15 and a snap-fit ​​fixing column 16. The spiral guide plate 14 is spirally distributed along the inner circumferential wall of the truncated cone-shaped cover body 13, the embedded plate 15 is arranged at the small-diameter port of the truncated cone-shaped cover body 13, and the snap-fit ​​fixing column 16 is arranged on the circumferential side wall of the embedded plate 15.

[0038] like Figure 1 、 Figure 8As shown, the self-rotating cleaning primary filtering mechanism 3 includes a hollow filter ball 6, a cleaning transmission part 7 and an inductive floating part 35. The hollow filter ball 6 is rotatably arranged in the drainage pipe 1, and the cleaning transmission part 7 is arranged in the hollow filter ball 6. The inductive floating part 35 is sealingly and slidably arranged on the drainage pipe 1, and the inductive floating part 35 is connected to the cleaning transmission part 7; the inductive floating part 35 includes a lifting column 8, a limiting fitting arc plate 9 and a floating ball 10. The lifting column 8 passes through the drainage pipe 1 and is connected to the cleaning transmission part 7. The floating ball 10 is arranged at the upper end of the lifting column 8, the limiting fitting arc plate 9 is arranged on the lifting column 8, and the limiting fitting arc plate 9 is movably fitted on the outer circumferential wall of the drainage pipe 1; the cleaning transmission part 7 includes a cleaning rotating gear 11 and a cleaning transmission rack 12. The cleaning rotating gear 11 is arranged on the hollow filter ball 6, the cleaning transmission rack 12 is meshed and connected to the cleaning rotating gear 11, and the bottom end of the cleaning transmission rack 12 is connected to the bottom end of the lifting column 8.

[0039] like Figure 1 、 Figure 7 As shown, the secondary filtering mechanism 4 includes an inclined filter plate 17, an aggregate discharge pipe 18 and a control valve plate 19. The inclined filter plate 17 is arranged on the inner wall of the drainage pipe 1, and the aggregate discharge pipe 18 is connected to the drainage pipe 1. The aggregate discharge pipe 18 is arranged between the self-rotating cleaning primary filtering mechanism 3 and the inclined filter plate 17, and the control valve plate 19 is arranged in the aggregate discharge pipe 18; the control valve plate 19 includes a blocking release plate 20, a rotating shaft 21 and a control button 22. The blocking release plate 20 is arranged in a circular plate shape, and the outer diameter of the blocking release plate 20 is adapted to the inner diameter of the aggregate discharge pipe 18, and is used to block the aggregate discharge pipe 18. The blocking release plate 20 is rotatably arranged in the aggregate discharge pipe 18. A through hole is provided on the side wall of the aggregate discharge pipe 18. One end of the rotating shaft 21 is connected to the circumferential side wall of the blocking release plate 20 near the through hole through the through hole, and the control button 22 is connected to the other end of the rotating shaft 21.

[0040] like Figure 1 、 Figure 10 As shown, the spiral dredging device 5 includes a dredging shaft 23, a spiral push piece 24 and an inductive dredging drive 25. The dredging shaft 23 is rotatably arranged in the drainage pipe 1, the spiral push piece 24 is arranged on the dredging shaft 23, and the inductive dredging drive 25 is arranged on the dredging shaft 23; the inductive dredging drive 25 includes a dredging gear 26, a dredging rack 27, a floating column 28 and a floating sensing ball 29. The dredging gear 26 is arranged on the dredging shaft 23, the dredging rack 27 is meshed and connected with the dredging gear 26, the floating column 28 passes through the drainage pipe 1 and is connected to the bottom end of the dredging rack 27, the floating sensing ball 29 is arranged at the upper end of the floating column 28, and the floating sensing ball 29 is arranged on the outside of the drainage pipe 1; a fitting limit plate 30 is provided on the floating column 28, and the fitting limit plate 30 is movably fitted on the outer circumferential wall of the drainage pipe 1, and the floating column 28 is used for limiting.

[0041] In specific use, when draining, the water flows in through the large-diameter end of the diverter cover 2. When the water flows into the diverter cover 2, due to the truncated cone structure of the diverter cover 2 and the spiral guide plate 14 on the inner wall, the water forms a spiral flow, and large particles of debris are centrifuged to the edge of the diverter cover 2, reducing the amount of debris entering the drainage pipe 1. The hollow filter ball 6 in the self-rotating cleaning primary filter mechanism 3 performs preliminary filtering on the water flow and intercepts the remaining debris. Over time, if the surface of the hollow filter ball 6 is blocked by debris, the drainage speed of the water flow will slow down, and the water will be discharged. The water level will rise. When the water level rises to a certain height (blocking water level), the floating ball 10 rises with the water level, driving the lifting column 8 to rise. The lifting column 8 drives the cleaning transmission rack 12 to rise. The cleaning transmission rack 12 drives the cleaning rotation gear 11, thereby rotating the hollow filter ball 6. The rotation of the hollow filter ball 6 can make the debris attached to its surface fall off under the action of centrifugal force and water flow scouring, thereby restoring the filtering capacity of the hollow filter ball 6. The water filtered by the self-rotating cleaning primary filter mechanism 3 reaches the secondary filter mechanism 4. The filter holes on the inclined filter plate 17 further filter the debris in the water flow. Under the action of gravity, the debris slides along the inclined plate into the aggregate discharge pipe 18. When it is necessary to clean the debris in the aggregate discharge pipe 18, the control button 22 can be turned. The rotation of the control button 22 drives the rotation of the shaft 21. The rotation of the shaft 21 drives the blocking release plate 20 to rotate, opening the aggregate discharge pipe 18. The debris in the aggregate discharge pipe 18 falls out, and the water flow after being filtered by the secondary filter mechanism 4 reaches the spiral dredging device 5. If there is debris in the drain pipe This area of ​​​​the drainage pipe 1 accumulates. As the water level rises to the blockage level, the floating sensing ball 29 rises, driving the floating column 28 to rise. The floating column 28 drives the dredging rack 27 to rise. The dredging rack 27 drives the dredging gear 26 to rotate, thereby rotating the dredging shaft 23. The spiral pushing piece 24 on the dredging shaft 23 rotates with the dredging shaft 23, and spirally pushes the debris that may be blocked, so that the debris is smoothly discharged from the drainage pipe 1 along with the water flow. The above is the specific working process of the present invention. You can repeat this step next time you use it.

[0042] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0043] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the foregoing and their equivalents.

[0044] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A drainage device for a water conservancy project, characterized in that: The invention comprises a drainage pipe (1), a diversion cover (2), a self-rotating cleaning primary filtering mechanism (3), a secondary filtering mechanism (4) and a spiral dredging device (5), wherein the diversion cover (2) is engaged and rotatably disassembled and is arranged at the water inlet of the drainage pipe (1), the self-rotating cleaning primary filtering mechanism (3) is arranged in the drainage pipe (1), the secondary filtering mechanism (4) is arranged in the drainage pipe (1), the secondary filtering mechanism (4) is arranged downstream of the self-rotating cleaning primary filtering mechanism (3), the spiral dredging device (5) is arranged in the drainage pipe (1), and the spiral dredging device (5) is arranged downstream of the secondary filtering mechanism (4); the self-rotating cleaning primary filtering mechanism (3) comprises a hollow filter ball (6), a cleaning transmission member (7) and an inductive floating member (35), the hollow filter ball (6) is rotatably arranged in the drainage pipe (1), the cleaning transmission member (7) is arranged in the hollow filter ball (6), the inductive floating member (35) is arranged downstream of the secondary filtering mechanism (4), and the self-rotating cleaning primary filtering mechanism (3) comprises a hollow filter ball (6), a cleaning transmission member (7) and an inductive floating member (35), the hollow filter ball (6) is rotatably arranged in the drainage pipe (1), the cleaning transmission member (7) is arranged in the hollow filter ball (6), the inductive floating member (35) is arranged downstream of the secondary filtering mechanism (4). The inductive floating member (35) is sealed and slidably arranged on the drainage pipe (1), and the inductive floating member (35) is connected to the cleaning transmission member (7); the inductive floating member (35) includes a lifting column (8), a limiting fitting arc plate (9) and a floating ball (10), the lifting column (8) passes through the drainage pipe (1) and is connected to the cleaning transmission member (7), the floating ball (10) is arranged on the upper end of the lifting column (8), the limiting fitting arc plate (9) is arranged on the lifting column (8), and the limiting fitting arc plate (9) is movably fitted on the outer circumferential wall of the drainage pipe (1); the cleaning transmission member (7) includes a cleaning rotating gear (11) and a cleaning transmission rack (12), the cleaning rotating gear (11) is arranged on the hollow filter ball (6), the cleaning transmission rack (12) is meshed and connected with the cleaning rotating gear (11), and the bottom end of the cleaning transmission rack (12) is connected to the bottom end of the lifting column (8).

2. A water conservancy project drainage device according to claim 1, characterized in that: The diversion cover (2) comprises a truncated cone-shaped cover body (13), a spiral guide plate (14), an embedded plate (15) and a snap-fit ​​fixing column (16), wherein the spiral guide plate (14) is spirally distributed along the inner peripheral wall of the truncated cone-shaped cover body (13), the embedded plate (15) is arranged at the small-diameter port of the truncated cone-shaped cover body (13), and the snap-fit ​​fixing column (16) is arranged on the circumferential side wall of the embedded plate (15).

3. A water conservancy project drainage device according to claim 2, characterized in that: The secondary filtering mechanism (4) comprises an inclined filter plate (17), a material collection and discharge pipe (18) and a control valve plate (19); the inclined filter plate (17) is arranged on the inner wall of the drainage pipe (1); the material collection and discharge pipe (18) is connected to the drainage pipe (1); the material collection and discharge pipe (18) is arranged between the self-rotating cleaning primary filtering mechanism (3) and the inclined filter plate (17); and the control valve plate (19) is arranged in the material collection and discharge pipe (18).

4. A water conservancy project drainage device according to claim 3, characterized in that: The control valve plate (19) includes a blocking and releasing plate (20), a rotating shaft (21) and a control button (22). The blocking and releasing plate (20) is arranged in a circular plate shape. The outer diameter of the blocking and releasing plate (20) is adapted to the inner diameter of the aggregate discharge pipe (18). The blocking and releasing plate (20) is rotatably arranged in the aggregate discharge pipe (18). A through hole is provided on the side wall of the aggregate discharge pipe (18). One end of the rotating shaft (21) is connected to the circumferential side wall of the blocking and releasing plate (20) near the through hole through the through hole. The control button (22) is connected to the other end of the rotating shaft (21).

5. A water conservancy project drainage device according to claim 4, characterized in that: The spiral dredging device (5) comprises a dredging rotating shaft (23), a spiral pushing piece (24) and an inductive dredging driving member (25); the dredging rotating shaft (23) is rotatably arranged in the drainage pipe (1); the spiral pushing piece (24) is arranged on the dredging rotating shaft (23); and the inductive dredging driving member (25) is arranged on the dredging rotating shaft (23).

6. A water conservancy project drainage device according to claim 5, characterized in that: The inductive dredging drive member (25) includes a dredging gear (26), a dredging rack (27), a floating column (28) and a floating inductive ball (29), wherein the dredging gear (26) is arranged on the dredging shaft (23), the dredging rack (27) is meshed and connected with the dredging gear (26), the floating column (28) passes through the drainage pipe (1) and is connected to the bottom end of the dredging rack (27), the floating inductive ball (29) is arranged at the upper end of the floating column (28), and the floating inductive ball (29) is arranged on the outside of the drainage pipe (1).

7. A water conservancy project drainage device according to claim 6, characterized in that: The floating column (28) is provided with a fitting limit plate (30), and the fitting limit plate (30) is movably fitted on the outer circumferential wall of the drainage pipe (1).

8. A water conservancy project drainage device according to claim 7, characterized in that: The water inlet of the drainage pipe (1) is provided with a snap groove (31), the snap fixing column (16) is snap-fitted in the snap groove (31), a fixed ring plate (32) is provided on the inner wall of the drainage pipe (1), the hollow filter ball (6) is rotatably provided on the fixed ring plate (32), the dredging shaft (23) is rotatably provided on the fixed ring plate (32), a lifting hole (33) is provided on the outer circumferential wall of the drainage pipe (1), the lifting column (8) is telescopically provided in the lifting hole (33), a floating hole (34) is provided on the outer circumferential wall of the drainage pipe (1), and the floating column (28) is telescopically provided in the floating hole (34).

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