A drainage device for river water conservancy project

Abstract

The present invention provides a drainage device for a river water conservancy project, which belongs to the technical field of water conservancy drainage, including a river main channel, a grating plate installed inside the river main channel, a grit chamber assembly arranged at one end of the river main channel away from the grating plate, a speed regulating diversion component arranged between the grating plate and the grit chamber assembly, a liquid level sensor arranged between the grating plate and the speed regulating diversion component, a water storage tank assembly arranged outside the river main channel, the speed regulating diversion component including a diversion dam, a strip support plate assembly, a guide plate assembly, a diversion tube assembly and a jacking assembly; the two ends of the strip support plate assembly are respectively fixedly connected to the bottom plate and the diversion dam of the river main channel, the diversion tube assembly is located inside the diversion dam, the diversion tube assembly passes through the diversion dam and the river main channel and extends into the interior of the water storage tank assembly, and the jacking assembly is located on the top of the diversion dam and connected thereto. The present invention effectively solves the risk that the function of the grit chamber is weakened or even destroyed due to excessive water flow speed during river drainage.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy and drainage, and specifically relates to a drainage device for a river water conservancy project. Background Art

[0002] Water conservancy projects usually refer to projects that use water resources for development, utilization and management. The main tasks of water conservancy projects are to regulate water distribution, control water flow, utilize water capacity and protect the water environment. When implementing water conservancy projects in rivers, it is often necessary to use drainage devices to direct water flows to designated places for their utilization. Since the water sources of rivers are diverse and may contain a large amount of silt, sedimentation tanks are usually set up in the rivers.

[0003] Patent document CN219638069U discloses a river slope protection drainage device for water conservancy projects, including a prefabricated drainage trough body, a clamping block and an arc-shaped mounting plate, a clamping slot is opened at the rear of the prefabricated drainage trough body, a clamping block is fixedly connected to the front side of the prefabricated drainage trough body symmetrically, the clamping block is clamped with the clamping slot on the adjacent prefabricated drainage trough body, an arc-shaped mounting plate is fixedly connected to the prefabricated drainage trough body, and a diverter plate is also included, and a plurality of diverter plates are fixedly connected to the arc-shaped mounting plate at even intervals. The diverter plate can block impurities, thereby achieving the purpose of preventing blockage, thereby accelerating the drainage speed.

[0004] However, in actual application, if the water flow rate is too fast, the sedimentation effect in the grit chamber will be weakened, and the coarser particles of silt will not be effectively precipitated. In addition, the excessively fast inflow rate will produce high local turbulence in the grit chamber, which will wash away the protective structure inside the grit chamber and cause damage. At the same time, the water level in the river channel is also affected by many factors such as weather changes, upstream water, slope protection water inflow and downstream water intake. If it is not restrained, the hydraulic gradient will be large and the water flow rate will be fast during the rainy season, making it difficult for silt to accumulate in the grit chamber. During the off-season, it is easy for the upstream water inflow to fail to meet the needs of the downstream. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention aims to provide a drainage device for a river water conservancy project, which effectively removes floating objects in the incoming water through a grille plate, arranges a strip support plate assembly at a low water level in the river, arranges a dam body with an isosceles trapezoidal cross section on the support plate assembly, and movably connects a guide plate assembly to the outer surface of the dam body. When the incoming water level at the front end of the dam body is low, the water flows into the sedimentation tank at a gentle speed due to the small hydraulic gradient; when the incoming water level at the front end of the dam body is high, a part of the incoming water that exceeds the dam body enters the guide plate to slow down, and when it passes through the lower bottom side of the dam body, the flow cross section is expanded, and the water flow speed is significantly slowed down. This part of the water flow will not cause impact on the sedimentation tank, and another part of the incoming water that exceeds the dam body enters the dam body. The rising water level flows into the water reservoir assembly after multiple filtrations. In the off-season, the water reservoir assembly is pumped into the river channel for downstream replenishment, which effectively solves the problem that in the actual application of the prior art, if the water flow rate is too fast, the sedimentation effect in the grit chamber will be weakened, and the coarser particles of silt cannot be effectively precipitated. In addition, the excessively fast incoming water flow rate will produce high local turbulence in the grit chamber, which will wash away the protective structure inside the grit chamber and cause damage. At the same time, the water level in the river channel is also restricted by many factors such as weather changes, upstream water, slope protection water inflow and downstream water intake. If it is not restricted, the hydraulic gradient is large and the water flow rate is fast in the rainy season, and silt is not easy to accumulate in the grit chamber. In the off-season, it is easy to cause the upstream water inflow to fail to meet the needs of the downstream.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a drainage device for a river water conservancy project, comprising a main channel of a river, a grating plate is installed at one end inside the main channel of the river, a grit chamber assembly is arranged at one end of the main channel of the river away from the grating plate, a speed regulating diversion component is arranged between the grating plate and the grit chamber assembly, a liquid level sensor is arranged between the grating plate and the speed regulating diversion component, a water storage tank assembly is arranged outside the main channel of the river, the speed regulating diversion component comprises a diversion dam, a strip support plate assembly, a guide plate assembly, a diversion tube assembly and a jacking assembly; one end of the strip support plate assembly is fixedly connected to the bottom plate of the main channel of the river, and the other end is fixedly connected to the diversion dam, the diversion tube assembly is located inside the diversion dam, the diversion tube assembly passes through the diversion dam and the main channel of the river and extends into the interior of the water storage tank assembly, and the jacking assembly is located on the top of the diversion dam and connected thereto.

[0007] As a further improvement of the present invention, the grit chamber assembly includes a grit chamber body, a grit chamber discharge pipe and a grit chamber stop valve, the grit chamber body is connected to the main channel of the river, the grit chamber discharge pipe is connected to the grit chamber body, and the rear end of the grit chamber discharge pipe is connected to the grit chamber stop valve.

[0008] As a further improvement of the present invention, the diversion dam includes a dam body, a movable filter plate and a sealing door. The cross-section of the dam body is an isosceles trapezoid, and the upper base of the isosceles trapezoid is close to the grid plate. A water inlet and a T-shaped groove are provided on the upper bottom side of the dam body. The movable filter plate is engaged in the T-shaped groove. A slag discharge port is provided on the lower bottom side of the dam body, and two sealing doors are rotatably connected in the slag discharge port.

[0009] As a further improvement of the present invention, the inner bottom surface of the dam body is an inclined surface, and the upper bottom side of the dam body is also provided with a first through hole, the top of the first through hole is provided with a coarse filtration limit groove, and the bottom of the dam body is provided with a second through hole; the movable filter plate is provided with a third through hole, and the top of the third through hole is provided with a handle, and when the movable filter plate is fully engaged in the T-slot, the handle abuts against the coarse filtration limit groove, and the positions of the third through hole and the first through hole are consistent.

[0010] As a further improvement of the present invention, the guide plate assembly is movably connected to the waist of the dam body, the guide plate assembly abuts against the inner wall of the main channel of the river, and a plurality of fourth through holes are opened on the surface of the guide plate assembly.

[0011] As a further improvement of the present invention, the diverter tube assembly includes a liquid inlet tube, a reducer and an oblique tube, wherein the liquid inlet tube is located at the top of the reducer and connected thereto, and the oblique tube is located at the bottom of the reducer and connected thereto.

[0012] As a further improvement of the present invention, a fifth through hole is provided on the liquid inlet cylinder, the diameter of the fifth through hole is smaller than the diameter of the first through hole, and the lowest point of the fifth through hole is higher than the lowest point of the first through hole.

[0013] As a further improvement of the present invention, the lifting assembly includes an electric cylinder, an electric cylinder mounting plate, a mounting frame and a sealing cylinder, the electric cylinder mounting plate is fixedly connected to the electric cylinder by bolts, the mounting frame is fixedly connected to the electric cylinder mounting plate, the mounting frame is located at the top of the dam body and connected thereto, the extending shaft of the electric cylinder extends into the interior of the liquid inlet cylinder and passes through the sealing cylinder, and the extending shaft of the electric cylinder and the sealing cylinder are fixedly connected by a nut.

[0014] As a further improvement of the present invention, a sealing groove is provided in the middle of the outer side surface of the sealing cylinder, and a sixth through hole is provided from top to bottom of the sealing cylinder, wherein the diameter of the sixth through hole is smaller than the diameter of the fifth through hole.

[0015] The present invention also provides a drainage method for a river water conservancy project, the drainage method comprising a normal drainage method S1 and a diversion drainage method S2;

[0016] The normal drainage method S1 includes the following steps:

[0017] S11, water from upstream enters the main channel of the river through the grating plate, and floating objects are blocked outside the grating plate and cannot enter the main channel of the river;

[0018] S12, when the water level is lower than the dam body, the water in the main channel of the river flows downstream at a normal flow rate through the gaps between the strip support plate assemblies. When the water level is higher than the bottom plate of the dam body and does not reach the preset low value of the liquid level sensor, the water in the main channel of the river is divided into three parts. The first part flows downstream at a normal flow rate through the gaps between the strip support plate assemblies; the second part first increases speed from the upper bottom side of the dam body and then decreases speed through the guide plate assembly to the lower bottom side of the dam body and then decreases speed again to flow downstream; the third part enters the dam body;

[0019] S13, most of the sediment at the bottom of the water flowing downstream is retained in the grit chamber assembly;

[0020] The diversion drainage method S2 includes the following steps:

[0021] S21, when the water level reaches the preset low value of the liquid level sensor, the electric cylinder extends, driving the sealing cylinder to move downward, and the operation of the electric cylinder is stopped when the highest end of the sealing cylinder is lower than the lowest end of the fifth through hole;

[0022] S22, at this time, the water entering the dam body in step S12 first enters the interior of the liquid inlet cylinder through the fifth through hole, and the large particles of impurities sink into the interior of the dam body;

[0023] S23, the water in the liquid inlet cylinder flows into the water reservoir assembly through the sixth through hole and the inclined pipe;

[0024] S24, when the water level drops below the preset low value of the liquid level sensor, the electric cylinder recovers and cleans the impurities on the top surface of the sealing cylinder;

[0025] S25, open the sealing door as needed to clean the impurities in the dam body.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The present invention provides a drainage device for a river water conservancy project, which integrates multiple functions such as filtration, sand settling, flow rate regulation and diversion through the arrangement of a river main channel, a grating plate, a sand settling tank assembly, a liquid level sensor, a speed regulating and diversion component and a water reservoir assembly, and effectively solves the risk of weakening or even destroying the function of the sand settling tank due to excessive water flow during river drainage.

[0028] (2) The present invention provides a drainage device for a river water conservancy project, in which a strip support plate assembly is arranged at a low water level of the river, a dam body with an isosceles trapezoidal cross section is arranged on the support plate assembly, and a guide plate assembly is movably connected to the outer surface of the dam body. When the water level of the incoming water at the front end of the dam body is low, the water flows into the sedimentation tank at a gentle speed due to the small hydraulic gradient; when the water level of the incoming water at the front end of the dam body is high, a part of the incoming water that exceeds the dam body enters the guide plate to slow down, and when it passes through the lower side of the dam body, the flow cross section is expanded, and the water flow speed is significantly slowed down. This part of the water flow will not cause impact on the sedimentation tank, and another part of the incoming water that exceeds the dam body enters the dam body and flows into the water storage tank assembly. In the off-season, the water storage tank assembly is pumped into the river for replenishment downstream.

[0029] (3) The present invention provides a drainage device for a river water conservancy project. The water entering the water reservoir assembly is filtered multiple times and impurities can be discharged through the device, thereby effectively ensuring the water quality in the water reservoir assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 is a structural schematic diagram of a grit chamber assembly of the present invention;

[0032] Figure 3 It is a three-dimensional structural schematic diagram of the speed regulating and diverting component of the present invention;

[0033] Figure 4 It is a schematic diagram of the internal structure of the speed regulating and diverting component of the present invention;

[0034] Figure 5 It is a schematic diagram of the internal structure of the speed regulating and diverting component of the present invention from another perspective;

[0035] Figure 6 It is a structural schematic diagram of the dam body of the present invention;

[0036] Figure 7 It is a structural schematic diagram of the movable filter plate of the present invention;

[0037] Figure 8 It is a structural schematic diagram of the diverter cartridge assembly of the present invention;

[0038] Fig. 9 It is a structural schematic diagram of the jacking assembly of the present invention.

[0039] In the figure: the main channel of the river 100; the grating plate 200; the grit chamber assembly 300; the grit chamber body 310; the grit chamber discharge pipe 320; the grit chamber stop valve 330; the diversion dam 400; the dam body 410; the inclined surface 411; the water inlet 412; the T-shaped groove 413; the coarse filter limit groove 414; the first through hole 415; the second through hole 416; the slag discharge port 417; the movable filter plate 420; the third through hole 421; the Hand-422; sealing door-430; strip support plate assembly-500; guide plate assembly-600; fourth through hole-601; diverter cylinder assembly-700; liquid inlet cylinder-710; fifth through hole-711; reducer-720; inclined pipe-730; lifting assembly-800; electric cylinder-810; electric cylinder mounting plate-820; mounting frame-830; sealing cylinder-840; sealing groove-841; sixth through hole-842; water reservoir assembly-900. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be pointed out that the terms "upper", "lower", "left", "right", "top", "bottom", "inside", "outside" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0042] It should be understood that, in the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense.

[0043] Example 1: See attached Figures 1 to 9 , this embodiment 1 provides a river water conservancy project drainage device, which includes a river main channel 100, a grating 200, a sand settling tank assembly 300, a speed regulating diversion component and a water reservoir assembly 900, wherein the speed regulating diversion component includes a diversion dam 400, a strip support plate assembly 500, a guide plate assembly 600, a diversion tube assembly 700 and a jacking assembly 800.

[0044] A grating plate 200 is installed at one end inside the main channel 100, a grit chamber assembly 300 is provided at one end of the main channel 100 away from the grating plate 200, a speed regulating diversion component is provided between the grating plate 200 and the grit chamber assembly 300, a liquid level sensor (not shown in the figure) is provided between the grating plate 200 and the speed regulating diversion component, and a water reservoir assembly 900 is provided outside the main channel 100; one end of the strip support plate assembly 500 is fixedly connected to the bottom plate of the main channel 100, and the other end is fixedly connected to the diversion dam 400, the diversion tube assembly 700 is located inside the diversion dam 400, the diversion tube assembly 700 passes through the diversion dam 400 and the main channel 100 and extends into the interior of the water reservoir assembly 900, and the jacking assembly 800 is located on the top of the diversion dam 400 and is connected thereto.

[0045] It is not difficult to understand that Figure 1 The middle river channel main channel 100 is only one section of it. The cross section of the river channel main channel 100 is U-shaped. It is usually cast with special materials on its side walls and bottom. There is a soil layer under the bottom of the river channel main channel 100. The grid plate 200 is used to intercept suspended matter in the water. The installation of the isolation grid and its impurity removal belong to existing mature technologies.

[0046] The grit chamber assembly 300 includes a grit chamber body 310, a grit chamber discharge pipe 320 and a grit chamber stop valve 330. The grit chamber body 310 is connected to the main channel 100 of the river, the grit chamber discharge pipe 320 is connected to the grit chamber body 310, and the rear end of the grit chamber discharge pipe 320 is connected to the grit chamber stop valve 330. The grit chamber assembly 300 is mainly used for the deposition of silt in the river channel. When the silt in the grit chamber assembly 300 accumulates to a certain amount, the sand can be cleaned regularly by equipment such as a scraper or a mud pusher, and the grit chamber stop valve 330 can be opened to discharge sewage.

[0047] The diverter dam 400 includes a dam body 410, a movable filter plate 420 and a sealing door 430. The horizontal cross-section of the dam body 410 is an isosceles trapezoid. The upper base of the isosceles trapezoid is close to the grid plate 200, and the lower base of the isosceles trapezoid is far away from the grid plate 200. The length of the upper base is smaller than the length of the lower base. A water inlet 412 and a T-shaped groove 413 are provided on the upper bottom side of the dam body 410. The movable filter plate 420 is engaged in the T-shaped groove 413. A slag discharge port 417 is provided on the lower bottom side of the dam body 410. Two sealing doors 430 are rotatably connected in the slag discharge port 417. The sealing door 430 will only be opened when cleaning impurities in the dam body 410.

[0048] The inner bottom surface of the dam body 410 is an inclined surface 411, and the water inlet 412 is a non-through setting. The upper bottom side of the dam body 410 is also provided with a first through hole 415, and the top of the first through hole 415 is provided with a coarse filtration limit groove 414, and the bottom of the dam body 410 is provided with a second through hole 416; a third through hole 421 is provided on the movable filter plate 420, and the specifications of the third through hole 421 are equal to those of the first through hole 415, and a handle 422 is provided on the top of the third through hole 421. When the movable filter plate 420 is fully engaged in the T-slot 413, the handle 422 abuts against the coarse filtration limit groove 414, and the positions of the third through hole 421 and the first through hole 415 are consistent.

[0049] The guide plate assembly 600 is movably connected to the waist of the dam body 410 , and abuts against the inner wall of the main channel 100 . The guide plate assembly 600 is a Z-shaped assembly, and a plurality of fourth through holes 601 are opened on the surface of the guide plate assembly 600 .

[0050] It is not difficult to understand that if there is no guide plate assembly 600, when the water level in the main channel of the river exceeds the water level of the dam body 410, a part of the water enters the interior of the dam body 410 through the first through hole 415 and the third through hole 421, and the other part of the water flows downstream through the space between the dam body 410 and the main channel 100 of the river. Since the upper bottom size of the horizontal cross-section of the dam body 410 is smaller than the lower bottom, the water flow rate in the space between the dam body 410 and the main channel 100 increases sharply and is very likely to cause turbulence. Although the flow rate of water will decrease when it flows to the lower bottom side of the dam body 410, the influence of turbulence is still likely to cause impact and weaken the effect of the sedimentation tank assembly 300. Therefore, a guide plate assembly 600 is usually movably connected to the outside of the dam body 410, and the relative inclination angles of each plate in the guide plate 600 can be adjusted by a support.

[0051] The shunt cylinder assembly 700 includes a liquid inlet cylinder 710, a reducer 720 and an oblique tube 730. The liquid inlet cylinder 710 is located at the top of the reducer 720 and connected thereto, and the oblique tube 730 is located at the bottom of the reducer 720 and connected thereto.

[0052] A fifth through hole 711 is provided on the liquid inlet cylinder 710 . The diameter of the fifth through hole 711 is smaller than the diameter of the first through hole 415 . The lowest point of the fifth through hole 711 is higher than the lowest point of the first through hole 415 .

[0053] The lifting assembly 800 includes an electric cylinder 810, an electric cylinder mounting plate 820, a mounting frame 830 and a sealing cylinder 840. The electric cylinder mounting plate 820 is fixedly connected to the electric cylinder 810 by bolts, the mounting frame 830 is fixedly connected to the electric cylinder mounting plate 820, the mounting frame 830 is located at the top of the dam body 410 and connected thereto, the extended shaft of the electric cylinder 810 extends into the interior of the liquid inlet cylinder 710 and passes through the sealing cylinder 840, the sealing cylinder 840 is located in the interior of the liquid inlet cylinder 710, and a shaft shoulder is provided at one end of the extended shaft of the electric cylinder 810 close to the reducer 720, and the extended shaft of the electric cylinder 810 and the sealing cylinder 840 are fixedly connected by a nut.

[0054] A sealing groove 841 is provided in the middle of the outer side surface of the sealing cylinder 840 . A sixth through hole 842 is provided in the sealing cylinder 840 from top to bottom. The diameter of the sixth through hole 842 is smaller than the diameter of the fifth through hole 711 .

[0055] It should be noted that the initial state of the electric cylinder 810 is that the extended shaft of the electric cylinder 810 is in a fully retracted state. At this time, the height of the top of the sealing cylinder 840 is usually flush with the height of the top of the liquid inlet cylinder 710, which is convenient for cleaning impurities in the sealing cylinder 840. At the same time, it can prevent external impurities from falling into the liquid inlet cylinder 710 when not in use. The water level at the preset low value of the liquid level sensor is lower than the lowest point of the fifth through hole 711. Generally, the preset low value of the liquid level sensor is set slightly higher than the bottom plate of the dam body 410. When the water level reaches the preset low value of the liquid level sensor, the signal is fed back to the PLC control system to extend the electric cylinder 810, and the operation of the electric cylinder 810 is stopped when the highest end of the sealing cylinder 840 is lower than the lowest end of the fifth through hole 711.

[0056] The present invention also provides a drainage method for a river water conservancy project, the drainage method comprising a normal drainage method S1 and a diversion drainage method S2;

[0057] The normal drainage method S1 includes the following steps:

[0058] S11, the water from the upstream enters the main channel 100 through the grating plate 200, and the floating objects are blocked outside the grating plate 200 and cannot enter the main channel 100.

[0059] S12, when the water level is lower than the dam body 410, the water in the main channel 100 flows downstream at a normal flow rate through the gaps between the strip support plate assemblies 500; when the water level is higher than the bottom plate of the dam body 410 and does not reach the preset low value of the liquid level sensor, the water in the main channel 100 is divided into three parts. The first part flows downstream at a normal flow rate through the gaps between the strip support plate assemblies 500; the second part first increases in speed from the upper bottom side of the dam body 410 and then decreases in speed through the guide plate assembly 600 to the lower bottom side of the dam body 410 and then decreases in speed again to flow downstream; the third part enters the dam body 410.

[0060] S13, most of the sediment at the bottom of the water flowing downstream is retained in the sand settling tank assembly 300.

[0061] The diversion drainage method S2 includes the following steps:

[0062] S21, when the water level reaches the preset low value of the liquid level sensor, the electric cylinder 810 extends, driving the sealing cylinder 840 to move downward, and the operation of the electric cylinder 810 is stopped when the highest end of the sealing cylinder 840 is lower than the lowest end of the fifth through hole 711.

[0063] S22 , at this time, the water entering the dam body 410 in step S12 first passes through the fifth through hole 711 and enters the interior of the liquid inlet cylinder 710 , and the large particles of impurities sink into the interior of the dam body 410 .

[0064] S23, the water inside the liquid inlet cylinder 710 passes through the sixth through hole 842 and flows into the water reservoir assembly 900 through the inclined tube 730.

[0065] S24, when the water level drops below the preset low value of the liquid level sensor, the electric cylinder 810 is restored to clean the impurities on the top surface of the sealing cylinder 840.

[0066] S25, opening the sealing door 430 as needed to clean the impurities in the dam body 410.

[0067] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drainage device for a river water conservancy project, comprising a river main channel (100), characterized in that: A grating plate (200) is installed at one end of the main channel (100) of the river, a grit chamber assembly (300) is arranged at one end of the main channel (100) away from the grating plate (200), a speed regulating diversion component is arranged between the grating plate (200) and the grit chamber assembly (300), a liquid level sensor is arranged between the grating plate (200) and the speed regulating diversion component, a water storage tank assembly (900) is arranged outside the main channel (100), and the speed regulating diversion component includes a diversion dam (400), a strip support plate assembly (500), and a guide plate assembly (501). The invention relates to a water storage tank assembly (900), a water diversion tube assembly (600), a diversion tube assembly (700) and a lifting assembly (800); one end of the strip support plate assembly (500) is fixedly connected to the bottom plate of the main channel (100) of the river channel, and the other end is fixedly connected to the diversion dam (400); the diversion tube assembly (700) is located inside the diversion dam (400); the diversion tube assembly (700) passes through the diversion dam (400) and the main channel (100) of the river channel and extends into the interior of the water storage tank assembly (900); the lifting assembly (800) is located on the top of the diversion dam (400) and is connected thereto.

2. The drainage device for river water conservancy project according to claim 1, characterized in that: The grit chamber assembly (300) comprises a grit chamber body (310), a grit chamber discharge pipe (320) and a grit chamber stop valve (330); the grit chamber body (310) is connected to the river main channel (100); the grit chamber discharge pipe (320) is connected to the grit chamber body (310); and the rear end of the grit chamber discharge pipe (320) is connected to the grit chamber stop valve (330).

3. The drainage device for river water conservancy project according to claim 1, characterized in that: The diversion dam (400) comprises a dam body (410), a movable filter plate (420) and a sealing door (430); the cross section of the dam body (410) is an isosceles trapezoid, and the upper base of the isosceles trapezoid is close to the grid plate (200); a water inlet (412) and a T-shaped groove (413) are provided on the upper bottom side of the dam body (410); the movable filter plate (420) is engaged in the T-shaped groove (413); a slag discharge port (417) is provided on the lower bottom side of the dam body (410), and two sealing doors (430) are rotatably connected in the slag discharge port (417).

4. The drainage device for river water conservancy project according to claim 3 is characterized in that: The inner bottom surface of the dam body (410) is an inclined surface (411), and the upper bottom side of the dam body (410) is also provided with a first through hole (415), and the top of the first through hole (415) is provided with a coarse filtering limit groove (414), and the bottom of the dam body (410) is provided with a second through hole (416); the movable filter plate (420) is provided with a third through hole (421), and the top of the third through hole (421) is provided with a handle (422), and when the movable filter plate (420) is completely engaged in the T-shaped groove (413), the handle (422) abuts against the coarse filtering limit groove (414), and the positions of the third through hole (421) and the first through hole (415) are consistent.

5. The drainage device for river water conservancy project according to claim 4, characterized in that: The guide plate assembly (600) is movably connected to the waist of the dam body (410), the guide plate assembly (600) is in contact with the inner wall of the main channel (100), and a plurality of fourth through holes (601) are provided on the surface of the guide plate assembly (600).

6. The drainage device for river water conservancy project according to claim 4, characterized in that: The diverter cylinder assembly (700) comprises a liquid inlet cylinder (710), a reducer (720) and an inclined tube (730), wherein the liquid inlet cylinder (710) is located at the top of the reducer (720) and connected thereto, and the inclined tube (730) is located at the bottom of the reducer (720) and connected thereto.

7. The drainage device for river water conservancy project according to claim 6, characterized in that: The liquid inlet cylinder (710) is provided with a fifth through hole (711), the diameter of the fifth through hole (711) is smaller than the diameter of the first through hole (415), and the position of the lowest point of the fifth through hole (711) is higher than the position of the lowest point of the first through hole (415).

8. The drainage device for river water conservancy project according to claim 7, characterized in that: The lifting assembly (800) includes an electric cylinder (810), an electric cylinder mounting plate (820), a mounting frame (830) and a sealing cylinder (840); the electric cylinder mounting plate (820) is fixedly connected to the electric cylinder (810) by bolts; the mounting frame (830) is fixedly connected to the electric cylinder mounting plate (820); the mounting frame (830) is located at the top of the dam body (410) and connected thereto; the extending shaft of the electric cylinder (810) extends into the interior of the liquid inlet cylinder (710) and passes through the sealing cylinder (840); the extending shaft of the electric cylinder (810) and the sealing cylinder (840) are fixedly connected by a nut.

9. The drainage device for river water conservancy project according to claim 8, characterized in that: A sealing groove (841) is provided in the middle of the outer side surface of the sealing cylinder (840), and a sixth through hole (842) is provided on the sealing cylinder (840) from top to bottom, wherein the diameter of the sixth through hole (842) is smaller than the diameter of the fifth through hole (711).

10. The drainage method of a river water conservancy project drainage device according to any one of claims 1 to 9, characterized in that: A drainage device for a river water conservancy project comprising any one of claims 1 to 9, wherein the drainage method comprises a normal drainage method S1 and a diversion drainage method S2; The normal drainage method S1 includes the following steps: S11, water from the upstream enters the main channel (100) through the grid plate (200), and floating objects are blocked outside the grid plate (200) and cannot enter the main channel (100); S12, when the water level is lower than the dam body (410), the water in the main channel (100) of the river flows downstream at a normal flow rate through the gaps between the strip support plate assemblies (500); when the water level is higher than the bottom plate of the dam body (410) and does not reach the preset low value of the liquid level sensor, the water in the main channel (100) of the river is divided into three parts, the first part flows downstream at a normal flow rate through the gaps between the strip support plate assemblies (500); the second part first increases in speed from the upper bottom side of the dam body (410), then decreases in speed through the guide plate assembly (600) to reach the lower bottom side of the dam body (410), and then decreases in speed again to flow downstream; the third part enters the dam body (410); S13, most of the sediment at the bottom of the water flowing downstream is retained in the sedimentation tank assembly (300); The diversion drainage method S2 includes the following steps: S21, when the water level reaches a preset low value of the liquid level sensor, the electric cylinder (810) extends, driving the sealing cylinder (840) to move downward, and the operation of the electric cylinder (810) is stopped when the highest end of the sealing cylinder (840) is lower than the lowest end of the fifth through hole (711); S22, at this time, the water entering the dam body (410) in step S12 first passes through the fifth through hole (711) and enters the interior of the liquid inlet cylinder (710), and the large particles of impurities sink into the interior of the dam body (410); S23, the water inside the liquid inlet cylinder (710) flows through the sixth through hole (842) and into the water reservoir assembly (900) via the inclined tube (730); S24, when the water level drops below the low value preset by the liquid level sensor, the electric cylinder (810) is restored to clean the impurities on the top surface of the sealing cylinder (840); S25, opening the sealing door (430) as needed to clean out impurities in the dam body (410).

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