Sand discharging device for hydropower station

Abstract

The present disclosure relates to a sand and stone discharging device for a hydropower station, comprising a gas storage bin, a sand and stone discharging pipe group and a sand and stone transfer mechanism. The bottom of the gas storage bin is open and the gas storage bin is used to be buried in the water body inside the dam body of the hydropower station. The gas pressure in the gas storage bin separates the inside of the gas storage bin into a gas cavity above the water surface and a water cavity below the water surface. The inlet end of the sand and stone discharging pipe group is communicated with the gas cavity. A valve group is arranged on the sand and stone discharging pipe group. The outlet end of the sand and stone discharging pipe group is used to extend to the outside of the dam body of the hydropower station. The valve group is used to prevent the gas pressure in the gas storage bin from leaking out. The sand and stone transfer mechanism is arranged in the gas storage bin. The sand and stone transfer mechanism is used to transfer the sand and stone at the bottom of the water cavity into the inlet of the sand and stone discharging pipe group. The device separates the sand and stone from the water body during the sand and stone discharging process. The water body is not discharged during the sand and stone discharging process. The technical problem that a large amount of water body is discharged together when the existing sand and stone discharging device is used is effectively solved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of desilting technology of hydropower stations, in particular to a desilting device for hydropower stations. BACKGROUND

[0002] The bottom of the water storage side of the dam body of a hydropower station is often piled up with silt and stones. If the silt and stones are not cleaned in time, the silt or stones will enter the inside of the water inlet pressure pipe, thereby damaging the impeller of the water machine and seriously affecting the normal operation of the hydropower station.

[0003] The existing technology generally uses a desilting device to discharge the silt and stones. The existing desilting device generally uses a pipeline to connect the water storage side and the outside of the dam body, uses the water level difference between the inside and outside of the dam body to form a water flow in the pipeline, and uses the water flow to carry the silt and stones, so as to discharge the silt and stones from the water storage side of the dam body to the outside of the dam body of the hydropower station.

[0004] However, the above type of device generally has the following problems: (1) the purpose is to discharge silt and stones, but a large amount of water is also discharged, and the flow of the discharged water is much larger than the flow of the silt and stone flow, which seriously affects the water storage performance of the dam body. (2) The accumulated silt and stones cannot be effectively driven by the water flow alone, resulting in unsatisfactory desilting effect. SUMMARY

[0005] The purpose of the present disclosure is to provide a desilting device for hydropower stations, which separates silt and stones from water during the desilting process, and does not discharge water during the desilting process, thereby effectively solving the technical problem that a large amount of water is discharged together when the existing desilting device is used.

[0006] In order to achieve the above purpose, the present disclosure provides a desilting device for hydropower stations, which comprises a gas storage bin, a desilting pipe group and a silt and stone transfer mechanism. The bottom of the gas storage bin is open. The gas storage bin is used to be buried in the water inside the dam body of the hydropower station. The gas pressure in the gas storage bin divides the inside of the gas storage bin into a gas cavity above the water surface and a water cavity below the water surface. The inlet end of the desilting pipe group is communicated with the gas cavity. A valve group is arranged on the desilting pipe group. The outlet end of the desilting pipe group is used to extend to the outside of the dam body of the hydropower station. The valve group is used to prevent the gas pressure in the gas storage bin from leaking out. The silt and stone transfer mechanism is arranged in the gas storage bin. The silt and stone transfer mechanism is used to transfer the silt and stones at the bottom of the water cavity to the inlet of the desilting pipe group.

[0007] Optionally, the sand and stone conveying mechanism comprises a rotating disc and a driving motor, the rotating disc is vertically arranged in the air storage bin, a plurality of sand and stone scooping members are uniformly distributed along the circumference of the rotating disc, the sand and stone scooping members are used for conveying the sand and stone at the bottom of the water cavity into the inlet of the sand and stone discharging pipe group during the rotation of the rotating disc, the driving motor is in transmission connection with the rotating disc, and the driving motor is used for driving the rotating disc to rotate.

[0008] Optionally, the sand and stone conveying mechanism further comprises a conveying belt, the conveying belt is located between the inlet end of the sand and stone discharging pipe group and the rotating disc, the terminal end of the conveying belt is connected with the inlet end of the sand and stone discharging pipe group, and the conveying belt is used for receiving the sand and stone conveyed by the sand and stone scooping members and conveying the received sand and stone into the inlet of the sand and stone discharging pipe group.

[0009] Optionally, the sand and stone scooping member comprises a sand and stone scoop and a connecting frame, the sand and stone scoop is provided with a water filtering hole, the sand and stone scoop is used for scooping the sand and stone at the bottom of the water cavity and filtering out the scooped water, the top end of the connecting frame is in rotational connection with the rotating disc through a first rotating shaft, the bottom end of the connecting frame is in rotational connection with the sand and stone scoop through a second rotating shaft, the axial direction of the first rotating shaft is parallel to the axial direction of the rotating disc, the axial direction of the first rotating shaft is perpendicular to the axial direction of the second rotating shaft, and the starting end of the conveying belt is provided with a pushing rod, the pushing rod is used for being in contact with the bottom of the sand and stone scoop to make the sand and stone scoop overturn so as to pour the sand and stone in the sand and stone scoop onto the conveying belt.

[0010] Optionally, one side of the sand and stone scoop is formed with a guide ridge, the guide ridge and the bottom surface of the sand and stone scoop form an obtuse angle, the connecting frame is provided with a positioning member, and the positioning member is in abutment with the inner wall of the guide ridge.

[0011] Optionally, the sand and stone discharging pipe group comprises a stone discharging pipe and a sand discharging pipe, the inlet end of the stone discharging pipe is connected with the terminal end of the conveying belt, the conveying belt is provided with a sand filtering hole, the lower side of the conveying belt is provided with a sand receiving groove, the groove bottom of the sand receiving groove is in the form of a downwardly inclined slope, and the inlet end of the sand discharging pipe is connected with the sand receiving groove.

[0012] Optionally, the stone discharging pipe and the sand discharging pipe are both arranged in a downwardly inclined manner, the stone discharging pipe is located above the sand discharging pipe, the stone discharging pipe and the sand discharging pipe are in communication through a sand filtering funnel, and the mouth of the sand filtering funnel is provided with a sand filtering net.

[0013] Optionally, the sand and stone discharging pipe group further comprises a regulating plate, the conveying belt and the sand receiving groove are connected through the regulating plate, and the regulating plate is provided with a vibrator.

[0014] Optionally, the valve group comprises a sand storage valve and a sand discharge valve, the inlet end of each pipe body of the sand discharge pipe group is provided with a sand storage valve, and the outlet end of each pipe body of the sand discharge pipe group is provided with a sand discharge valve.

[0015] Optionally, the top of the gas storage bin is provided with a balance valve, the balance valve is in communication with the gas storage bin, and the balance valve is used to adjust the gas pressure in the gas storage bin to adjust the size of the gas cavity.

[0016] Through the above technical solution, the sand and stone discharging device for hydropower stations provided by the present disclosure uses the gas pressure of the gas stored in the gas storage bin to resist the water pressure, lowers the water level in the gas storage bin, forms a gas cavity and a water cavity separated by the water surface, thereby forming a water-free space (i.e., a gas cavity) in the gas storage bin. On the basis of the above, by setting the sand and stone transfer mechanism, the sand and stone at the bottom of the water cavity are transferred into the gas cavity to separate the sand and stone from the water body. Then, by setting the sand and stone discharge pipe group, the inlet end of the sand and stone discharge pipe group is in communication with the gas cavity, the outlet end of the sand and stone discharge pipe group is in communication with the outside of the dam body, and a sand storage valve and a sand discharge valve are respectively arranged at the inlet end and the outlet end. The sand and stone separated from the water body are transferred to the inlet end of the sand and stone discharge pipe group by the sand and stone transfer mechanism, then the sand storage valve is opened, the sand and stone flow into the sand and stone discharge pipe group, and then the sand storage valve is closed and the sand discharge valve is opened. In this way, the sand and stone in the sand and stone discharge pipe group can be discharged to the outside of the dam body while the gas pressure in the gas cavity is maintained. The entire process separates the sand and stone from the water body, and the water body is not discharged during the sand and stone discharge process, effectively solving the technical problem that a large amount of water body is discharged together during the use of the existing sand and stone discharge device.

[0017] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and together with the following specific embodiments, serve to explain the present disclosure but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 is a side cross-sectional schematic view of a sand and stone discharging device for a hydropower station provided by an exemplary embodiment of the present disclosure;

[0020] Figure 2 is a side cross-sectional schematic view of a conveyor belt and sand receiving groove of a sand and stone discharging device for a hydropower station provided by an exemplary embodiment of the present disclosure;

[0021] Figure 3 is a side view schematic view of a sand and stone scoop of a sand and stone discharging device for a hydropower station provided by an exemplary embodiment of the present disclosure;

[0022] Figure 4 is a top view schematic view of the cooperation between the sand and stone scoop and the push rod of a sand and stone discharging device for a hydropower station provided by an exemplary embodiment of the present disclosure;

[0023] Figure 5 is a front view schematic diagram of the sand and stone scoop of the sand and stone discharging device for hydropower station before cooperation with the poking rod provided by an exemplary embodiment of the present disclosure;

[0024] Figure 6 is a front view schematic diagram of the sand and stone scoop of the sand and stone discharging device for hydropower station when cooperating with the poking rod.

[0025] Legend of reference signs

[0026] 10 - gas storage bin; 101 - balance valve; 11 - gas cavity; 12 - water cavity; 20 - rotating disc; 21 - sand and stone scoop; 211 - water filtering hole; 212 - guiding rail; 22 - connecting frame; 221 - positioning member; 30 - conveying belt; 301 - poking rod; 31 - sand filtering hole; 32 - sand receiving groove; 33 - regulating plate; 34 - vibrator; 40 - stone discharging pipe; 401 - guiding ramp; 41 - sand discharging pipe; 42 - storage valve; 43 - discharging valve; 44 - sand filtering funnel; 45 - sand discharging auger; 50 - lifting shovel. DETAILED DESCRIPTION

[0027] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0028] In the present disclosure, the orientation words such as "up, down, left, right" used without the opposite description are generally defined as the direction of the drawing surface, and "inner, outer" refers to the inner and outer of the related parts. In addition, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present disclosure, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0030] As Figures 1 to 6As shown, the present disclosure provides a sand and stone discharging device for a hydropower station, which comprises a gas storage bin 10, a sand and stone discharging pipe group and a sand and stone transfer mechanism. The bottom of the gas storage bin 10 is open. The gas storage bin 10 is used to be embedded in the water body inside the dam body of the hydropower station. The gas pressure in the gas storage bin 10 separates the inside of the gas storage bin 10 into a gas cavity 11 above the water surface and a water cavity 12 below the water surface. The inlet end of the sand and stone discharging pipe group is communicated with the gas cavity 11. The sand and stone discharging pipe group is provided with a valve group. The outlet end of the sand and stone discharging pipe group is used to extend to the outside of the dam body of the hydropower station. The valve group is used to prevent the gas pressure in the gas storage bin 10 from leaking out. The sand and stone transfer mechanism is arranged in the gas storage bin 10. The sand and stone transfer mechanism is used to transfer the sand and stone at the bottom of the water cavity 12 into the inlet of the sand and stone discharging pipe group.

[0031] Through the above technical solution, the closed gas storage bin 10 is embedded in the water body inside the dam body of the hydropower station (i.e. the gas storage bin 10 is below the water level in the middle dam). The gas pressure in the gas storage bin 10 is used to resist the water pressure. The water level in the gas storage bin 10 (i.e. the water level in the bin) is lowered. The gas cavity 11 and the water cavity 12 separated by the water surface (i.e. the water level in the bin) are formed. Thus, the water-free space (i.e. the gas cavity 11) is formed in the gas storage bin 10. On the basis of the above, the sand and stone transfer mechanism is arranged to transfer the sand and stone at the bottom of the water cavity 12 into the gas cavity 11, so that the sand and stone is separated from the water body. On the basis of the above, the sand and stone discharging pipe group is arranged so that the inlet end thereof is communicated with the gas cavity 11 and the outlet end thereof is communicated with the outside of the dam body. The valve group is arranged on the sand and stone discharging pipe group to prevent the gas pressure in the gas storage bin 10 from leaking out. Thus, the sand and stone in the sand and stone discharging pipe group can be discharged to the outside of the dam body without affecting the gas pressure in the gas cavity 11. The sand and stone is separated from the water body during the whole process. The water body will not be discharged during the sand and stone discharging process. Only the sand and stone will be discharged. Figure 1 Figure 1 Figure 1

[0032] It should be noted that the shape of the gas storage bin 10 can be designed according to the actual situation in the dam. The spherical shape with stronger pressure resistance is preferably adopted.

[0033] It should be noted that the embedding of the gas storage bin 10 in the water body specifically means that the bottom of the gas storage bin 10 is fixedly connected with the ground at the bottom inside of the dam body of the hydropower station through the fixing legs. The bottom of the gas storage bin 10 is reserved a certain distance from the ground, so that the bottom of the gas storage bin 10 can smoothly flow into the water body and the sand and stone. Preferably, the bottom of the gas storage bin 10 is above the sediment position. Alternatively, the bottom of the gas storage bin 10 is inserted below the sediment position. However, the sidewall of the gas storage bin 10 above the sediment position is provided with a mesh structure or a hole structure for water and sand and stone to enter the water cavity 12 in the gas storage bin 10.

[0034] ​​​It should be noted that since both sand and water have fluidity, when the sand transport mechanism transports the sand at the bottom of the water cavity 12 into the air cavity 11, the sand outside the air storage bin 10 will be filled into the air storage bin 10 under the action of its own fluidity and the fluidity of the water, so that the situation that the sand in the air storage bin 10 is taken out and the sand outside the air storage bin 10 is accumulated will not occur, and the sand transport mechanism will also cause unavoidable disturbance to the fluidity of the water and the sand during the process of taking sand, which can further improve the fluidity of the sand.

[0035] Optionally, the sand transport mechanism includes a rotating disc 20 and a driving motor, the rotating disc 20 is vertically arranged in the air storage bin 10, the rotating disc 20 is uniformly distributed with a plurality of sand scooping members along the circumference, the sand scooping members are used to transport the sand at the bottom of the water cavity 12 into the inlet of the sand discharge pipe group during the rotation of the rotating disc 20, and the driving motor is in transmission connection with the rotating disc 20, and the driving motor is used to drive the rotating disc 20 to rotate.

[0036] Through the above technical solution, the rotating disc 20 is vertically arranged and continuously rotates under the driving of the driving motor. Since the rotating disc 20 is uniformly distributed with a plurality of sand scooping members along the circumference, the sand in the water cavity 12 at the low position can be scooped up into the air cavity 11 at the high position during the rotation of the rotating disc 20, so as to realize the lifting of the sand, and then the sand is put into the inlet of the sand discharge pipe group through the sand scooping member.

[0037] In order to further optimize the sand transport mechanism and optimize the efficiency and success rate of sand transport, optionally, the sand transport mechanism further includes a conveying belt 30, the conveying belt 30 is located between the inlet end of the sand discharge pipe group and the rotating disc 20, the terminal end of the conveying belt 30 is connected with the inlet end of the sand discharge pipe group, and the conveying belt 30 is used to receive the sand transported by the sand scooping member and transport the received sand into the inlet of the sand discharge pipe group.

[0038] Through the above technical solution, the conveying belt 30 is used instead of the inlet of the sand discharge pipe group to cooperate with the sand scooping member, which effectively increases the cooperation area, changes the area of the inlet of the sand discharge pipe group which is relatively small into the surface of the conveying belt 30 which is relatively large, and effectively improves the efficiency and success rate of sand transport.

[0039] It should be noted that the above conveying belt 30 can adopt any one of the conveying belts in the prior art, as long as it has a conveying belt surface and can transport substances from one end of the conveying belt to the other end.

[0040] Optionally, the sand scooping member comprises a sand scoop 21 and a connecting frame 22, the sand scoop 21 is provided with a water filtering hole 211, the sand scoop 21 is used for scooping sand at the bottom of the water cavity 12 and filtering out the scooped water, the top end of the connecting frame 22 is rotationally connected with the rotating disc 20 through a first rotating shaft, the bottom end of the connecting frame 22 is rotationally connected with the sand scoop 21 through a second rotating shaft, the axial direction of the first rotating shaft is parallel to the axial direction of the rotating disc 20, the axial direction of the first rotating shaft is perpendicular to the axial direction of the second rotating shaft, the starting end of the conveying belt 30 is provided with a pushing rod 301, the pushing rod 301 is used for contacting the bottom of the sand scoop 21 to make the sand scoop 21 overturn to pour the sand in the sand scoop 21 onto the conveying belt 30.

[0041] Through the above technical scheme, the top end of the connecting frame 22 is rotationally connected with the rotating disc 20 through the first rotating shaft, so that the sand scoop 21 can be kept in a balanced state with the bottom downward no matter at any height, and the sand in the sand scoop 21 can be effectively prevented from spilling. The bottom end of the connecting frame 22 is rotationally connected with the sand scoop 21 through the second rotating shaft, when the pushing rod 301 contacts the bottom of the sand scoop 21, the sand scoop 21 can overturn after being stressed to pour the sand in the sand scoop 21 onto the surface of the conveying belt 30. The sand scoop 21 is provided with the water filtering hole 211, when the sand scoop 21 scoops sand and rises to separate from the water in the bin, the water in the sand scoop 21 can be filtered out through the water filtering hole 211, at this time, the sand scoop 21 basically only contains sand.

[0042] It should be noted that the sand scoop 21 can adopt any existing scoop-shaped object with a volume as long as it can scoop sand, and the connecting mode of the sand scoop 21 and the rotating disc 20 can adopt fixed connection or hinged connection as long as it does not affect the scooping of sand.

[0043] It should be noted that no matter the shape and connection mode of the sand scoop 21, as long as it is properly adjusted, the sand can be scooped up, and part of the sand in the sand scoop 21 can be transferred to the inlet of the sand discharging pipe group, and the specific shape and setting mode need to be debugged according to the actual situation.

[0044] In an embodiment of the present disclosure, the connecting frame 22 can be a triangular frame, the reason for setting the connecting frame 22 as a tripod is that, on the one hand, the structure of the tripod has strong stability, and on the other hand, the area is not too large to hinder the spilling of sand.

[0045] In an embodiment of the present disclosure, the connecting frame 22 can also be hollow, the hollow setting of the connecting frame 22 can further reduce the hindering area under the premise of ensuring the structural stability of the triangle, and further reduce the hindering of the connecting frame 22 to the sand during the spilling of the sand.

[0046] The sand shovel 21 is always arranged horizontally, although it can effectively prevent the sand and stones inside from spilling, but it cannot transport the sand and stones inside to the surface of the conveying belt 30, therefore, the bottom end of the connecting frame 22 is rotatably connected with the sand shovel 21 through a second rotating shaft, and the axial direction of the first rotating shaft is perpendicular to the axial direction of the second rotating shaft, so that the first rotating shaft and the second rotating shaft do not interfere with each other, and a pushing rod 301 is arranged at the starting end of the conveying belt 30, when the sand shovel 21 moves above the conveying belt 30, it will contact with the pushing rod 301, and during the process of falling, the pushing rod 301 remains stationary, so that the sand shovel 21 is forced to roll over, and the sand and stones inside are spilled to the surface of the conveying belt 30, and then the sand shovel 21 continues to fall until it is separated from the pushing rod 301, so that it returns to the initial state, i.e. the horizontal state, under the action of gravity.

[0047] Optionally, a guide edge 212 is formed on one side of the sand shovel 21, the angle between the guide edge 212 and the bottom surface of the sand shovel 21 is obtuse, and a positioning member 221 is arranged on the connecting frame 22, and the positioning member 221 abuts against the inner wall of the guide edge 212.

[0048] Through the above technical solution, the guide edge 212 is arranged to guide the spilling of sand and stones, so that the spilled sand and stones can flow smoothly to the surface of the conveying belt 30, and the obtuse guide edge 212 can optimize the angle of spilling sand and stones to prevent spilling too quickly. The positioning member 221 abuts against the inner wall of the guide edge 212, so that the sand shovel 21 is raised on the side away from the guide edge 212 in the natural state, so that the sand shovel 21 assumes a √ shape, facilitating scooping up sand and stones, and preventing sand and stones from falling from both sides.

[0049] It should be noted that the positioning member 221 can be of any shape, and is preferably a stick shape, which can effectively reduce the obstruction area.

[0050] Optionally, the sand and stone discharging pipe group includes a stone discharging pipe 40 and a sand discharging pipe 41, the inlet end of the stone discharging pipe 40 is connected with the terminal end of the conveying belt 30, the conveying belt 30 is provided with a sand filtering hole 31, and the lower side of the conveying belt 30 is provided with a sand receiving groove 32, the groove bottom of the sand receiving groove 32 is constructed as an inclined surface downwardly inclined, and the inlet end of the sand discharging pipe 41 is connected with the sand receiving groove 32.

[0051] Through the above technical solution, the sand filtering hole 31 is arranged on the conveying belt 30, so that during the conveying process of the conveying belt 30, the mud and sand in the sand and stones falls into the sand receiving groove 32 through the sand filtering hole 31, and flows along the inclined bottom surface of the sand receiving groove 32 to the inlet end of the sand discharging pipe 41, and at the same time, the stones on the conveying belt 30 enter the inlet end of the stone discharging pipe 40 along the conveying belt, and by arranging the stone discharging pipe 40 and the sand discharging pipe 41, the sand and stones can be preliminarily separated, so as to facilitate the subsequent recycling and utilization of the stones.

[0052] In one embodiment of the present disclosure, the inlet ends of the stone discharge pipe 40 and the sand discharge pipe 41 are communicated with the air cavity 11, and the outlet ends of the stone discharge pipe 40 and the sand discharge pipe 41 are located outside the dam body.

[0053] In one embodiment of the present disclosure, the terminal end of the conveying belt 30 is inserted into the inlet of the stone discharge pipe 40.

[0054] Optionally, the stone discharge pipe 40 and the sand discharge pipe 41 are both downwardly inclined, the stone discharge pipe 40 is located above the sand discharge pipe 41, the stone discharge pipe 40 and the sand discharge pipe 41 are communicated through a sand filtering funnel 44, and the mouth of the sand filtering funnel 44 is provided with a sand filtering net.

[0055] Through the above technical solution, the stone discharge pipe 40 and the sand discharge pipe 41 are both downwardly inclined, so that the substances in the stone discharge pipe 40 and the sand discharge pipe 41 can flow from the inlet section to the outlet end along the pipe wall under the action of gravity, the stone discharge pipe 40 and the sand discharge pipe 41 are communicated through the sand filtering funnel 44, so that the remaining sand mixed in the stone during the movement of the stone along the stone discharge pipe 40 can be discharged into the sand filtering funnel 44, and then enter the sand discharge pipe 41 through the sand filtering funnel 44, thereby realizing further separation of sand and stone.

[0056] In one embodiment of the present disclosure, the stone discharge pipe 40 and the sand discharge pipe 41 are both arranged in parallel in the dam body, and are both straight pipes, so that the shortest setting distance can be achieved under the condition that the two pipes are linearly arranged, and to some extent, the accumulation of sand in the pipes is prevented.

[0057] In one embodiment of the present disclosure, in order to prevent the sand from blocking the sand discharge pipe 41, a sand discharge auger 45 is arranged in the sand discharge pipe 41, so that the sand with certain viscosity in the sand discharge pipe 41 can be effectively treated, and the sand discharge pipe 41 is prevented from being blocked by the sand. It should be noted that the sand discharge auger 45 can be any auger for dredging a pipeline in the prior art.

[0058] In order to further improve the separation efficiency, optionally, the sand and stone pipe group further comprises a regulating plate 33, the conveying belt 30 and the sand receiving groove 32 are connected through the regulating plate 33, and the regulating plate 33 is provided with a vibrator 34.

[0059] Through the above technical solution, the regulating plate 33 supports the conveying belt 30 and the sand receiving groove 32 and integrates the two, which lays the foundation for subsequent integrated vibration, and limits the two sides of the conveying belt 30 and the sand receiving groove 32 to prevent the sand and stone from flowing out from the two sides, and the vibrator 34 drives the conveying belt 30 and the sand receiving groove 32 to vibrate together by vibrating the regulating plate 33, thereby improving the filtering efficiency of the sand filtering hole 31 of the conveying belt 30 and the flow rate of the sand at the bottom of the sand receiving groove 32.

[0060] In one embodiment of the present disclosure, the conveying belt 30 and the sand receiving groove 32 are integrally connected through the regulating plates 33. The upper parts of the two regulating plates 33 are vertically arranged on the two sides of the conveying belt 30, respectively, for preventing sand and stones from falling from the two sides of the conveying belt 30. The lower parts of the two regulating plates 33 are vertically arranged on the two sides of the sand receiving groove 32, respectively, for preventing sand and stones from flowing out from the two sides of the sand receiving groove 32.

[0061] Optionally, the valve group comprises a storage valve 42 and a discharge valve 43. The inlet end of each pipe body of the sand and stone discharge pipe group is provided with the storage valve 42, and the outlet end of each pipe body of the sand and stone discharge pipe group is provided with the discharge valve 43.

[0062] Through the above technical solution, after the sand and stone separated from the water body is transported to the inlet end of the sand and stone discharge pipe group by the sand and stone transportation mechanism, the storage valve 42 is opened, the sand and stone flows into the sand and stone discharge pipe group, then the storage valve 42 is closed, the inside of the sand and stone discharge pipe group is isolated from the inside of the gas storage cabin 10, and then the discharge valve 43 is opened, so that the sand and stone in the sand and stone discharge pipe group can be discharged to the outside of the dam body while the air pressure in the air cavity 11 is maintained.

[0063] Optionally, the top of the gas storage cabin 10 is provided with a balance valve 101, the balance valve 101 communicates with the gas storage cabin 10, and the balance valve 101 is used to adjust the air pressure in the gas storage cabin 10 to adjust the size of the air cavity 11.

[0064] Through the above technical solution, the balance valve 101 provided at the top of the gas storage cabin 10 extends out of the water surface in the dam during use. The balance valve 101 is used to adjust the air pressure in the gas storage cabin 10 (generally in the form of reducing the air pressure) on the one hand, and is used for water discharge and maintenance on the other hand. For example, during overall maintenance of the dam body, the water stored in the dam body is discharged. When the water surface height of the water body is basically level with the water surface height in the cabin, the balance valve 101 is opened, the air pressure inside and outside the gas storage cabin 10 is balanced, and the water body can continue to be discharged to implement the maintenance. After the maintenance is completed, the balance valve 101 is closed first, and then water storage is started until the water surface is higher than the top of the gas storage cabin 10, and then the air pressure in the gas storage cabin 10 is adjusted through the balance valve 101 so that the water surface in the gas storage cabin 10 is adjusted to the working height.

[0065] In order to handle the relatively large stones that may accumulate outside the gas storage cabin 10, a lifting track is arranged outside the gas storage cabin 10, and a lifting shovel 50 is connected to the lifting track in a lifting manner, which is used to lift the relatively large stones thereon.

[0066] It should be noted that the lifting track can be any one of the existing technologies, such as a screw nut type or a pulley type.

[0067] It should be noted that the outlet end of the stone discharge pipe 40 is provided with a guide slope 401, the bottom of the guide slope 401 is connected to the top of the outlet end of the sand discharge pipe 41, and the guide slope 401 extends out of the outlet end of the sand discharge pipe 41.

[0068] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details of the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0069] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the present disclosure.

[0070] In addition, various different embodiments of the present disclosure can also be combined in any appropriate manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A sand and gravel removal device for a hydropower station, characterized in that, include: The gas storage chamber is open at the bottom and is used to be buried in the water body inside the dam body of the hydropower station. The air pressure inside the gas storage chamber divides the interior of the gas storage chamber into an air cavity above the water surface and a water cavity below the water surface. The sand and gravel discharge pipe assembly has an inlet end connected to the air chamber. A valve assembly is installed on the sand and gravel discharge pipe assembly. The outlet end of the sand and gravel discharge pipe assembly is used to extend to the outside of the hydropower station dam. The valve assembly is used to prevent the air pressure in the air storage chamber from leaking out. A sand and gravel transfer mechanism is installed inside the gas storage chamber. The sand and gravel transfer mechanism is used to transfer the sand and gravel at the bottom of the water chamber to the inlet of the sand and gravel discharge pipe assembly.

2. The sediment removal device for hydropower stations according to claim 1, characterized in that, The sand and gravel transfer mechanism includes: A turntable is vertically installed inside the gas storage chamber. Multiple sand scooping components are evenly distributed around the circumference of the turntable. The sand scooping components are used to transfer the sand and gravel at the bottom of the water chamber to the inlet of the sand and gravel discharge pipe assembly during the rotation of the turntable. A drive motor is connected to the turntable for driving the turntable to rotate.

3. The sediment removal device for hydropower stations according to claim 2, characterized in that, The sand and gravel transfer mechanism also includes a conveyor belt located between the inlet end of the sand and gravel discharge pipe assembly and the turntable. The end of the conveyor belt is connected to the inlet end of the sand and gravel discharge pipe assembly. The conveyor belt is used to receive the sand and gravel transferred by the sand and gravel scoop component and transfer the received sand and gravel to the inlet of the sand and gravel discharge pipe assembly.

4. The sediment removal device for hydropower stations according to claim 3, characterized in that, The sand and gravel scoop component includes: A sand and gravel scoop with a water filter hole is used to scoop up sand and gravel from the bottom of the water chamber and filter out the scooped water. The connecting frame is rotatably connected to the turntable at its top via a first rotating shaft, and rotatably connected to the sand scoop at its bottom via a second rotating shaft. The axis of the first rotating shaft is parallel to the axis of the turntable, and the axis of the first rotating shaft is perpendicular to the axis of the second rotating shaft. The conveyor belt is equipped with a lever at the beginning, which is used to contact the bottom of the sand scoop to tilt the sand scoop and pour the sand and gravel inside the sand scoop onto the conveyor belt.

5. The sediment removal device for hydropower stations according to claim 4, characterized in that, A guide edge is formed on one side of the sand scoop, and the angle between the guide edge and the bottom surface of the sand scoop is an obtuse angle. A positioning element is provided on the connecting frame, and the positioning element abuts against the inner wall of the guide edge.

6. The sediment removal device for hydropower stations according to claim 3, characterized in that, The sand and gravel discharge pipe assembly includes: The stone discharge pipe has its inlet end connected to the end of the conveyor belt. The conveyor belt has sand filter holes, and a sand receiving trough is provided below the conveyor belt. The bottom of the sand receiving trough is a downward sloping surface. The sand discharge pipe has its inlet end connected to the sand receiving trough.

7. The sediment removal device for hydropower stations according to claim 6, characterized in that, Both the stone discharge pipe and the sand discharge pipe are inclined downwards, with the stone discharge pipe located above the sand discharge pipe. The stone discharge pipe and the sand discharge pipe are connected by a sand filter funnel, and a sand filter screen is provided at the opening of the sand filter funnel.

8. The sediment removal device for hydropower stations according to claim 6, characterized in that, The sand and gravel discharge pipe assembly also includes a regulating plate, and the conveyor belt is connected to the sand receiving trough through the regulating plate. A vibrator is installed on the regulating plate.

9. The sediment removal device for hydropower stations according to claim 1, characterized in that, The valve group includes a storage valve and a discharge valve. Each pipe of the sand and gravel discharge pipe group is equipped with a storage valve at its inlet end and a discharge valve at its outlet end.

10. The sediment removal device for hydropower stations according to claim 1, characterized in that, A balance valve is installed on the top of the gas storage chamber. The balance valve is connected to the gas storage chamber and is used to adjust the gas pressure inside the gas storage chamber to adjust the size of the gas chamber.

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