Movable trash holding device for water inlet of hydropower station

Abstract

The invention belongs to the technical field of river channel trash holding, and particularly relates to a movable trash holding device for a water inlet of a hydropower station, the trash holding device is mounted at the water inlet of the hydropower station and comprises a rack, a trash intercepting barrier, a chain belt transmission mechanism, a rake tooth assembly and a striker plate, the rack is obliquely erected at the water inlet, the trash intercepting barrier is arranged on the water inlet surface of the rack, and the chain belt transmission mechanism is arranged on the striker plate. The chain belt transmission mechanism is arranged on the rack, so that water flow can pass through the water inlet surface of the rack, the chain belt transmission mechanism is distributed along an inner cavity of the rack, a chain on the chain belt transmission mechanism reciprocates up and down in the cavity of the rack, and when the chain belt transmission mechanism walks in the rack, a space formed between the chain belt transmission mechanism and the cavity wall of the rack is a walking path. According to the device, the rake teeth can retract inwards to form an included angle with the striker plate, so that salvaged floating objects can be better collected, smaller floating objects can be captured and collected through grabbing and salvaging, and the rake teeth are arranged on the back of a sewage intercepting barrier and are not prone to interfering with the barrier to cause the rake clamping fault.

Description

Technical Field

[0001] The invention belongs to the technical field of river pollution interception, and in particular relates to a movable pollution interception device at a water inlet of a hydropower station. Background Art

[0002] The water intake of a hydropower station is a vital component of the entire power generation system. It is responsible for introducing water from the reservoir or river to drive the generator set to generate electricity. A well-designed water intake of a hydropower station can not only ensure power generation efficiency, but also effectively reduce the impact on the environment and protect the aquatic ecosystem.

[0003] The water intake is usually located at the downstream end of a reservoir or on the bank of a river. Its design needs to consider many factors, including water flow characteristics, sediment content, aquatic life protection, etc. The water intake structure includes key components such as trash racks, gates, and hoists, which work together to ensure that water flows steadily and evenly into the power generation system.

[0004] Among them, the trash rack is the first line of defense at the water inlet. It can intercept floating objects and large impurities in the water and protect subsequent equipment from damage. The garbage cleaning equipment in the prior art is a rotary grille chain assembled by rake teeth. Driven by the motor reducer, the rake chain performs a rotary motion in the opposite direction of the water flow. When the rake chain runs to the upper part of the equipment, due to the guidance of the groove wheel and the curved rail, the solid materials on each group of rake teeth fall by gravity to complete the reciprocating salvage work. However, the prior art still has the following technical problems: during the salvage process, the angle of the rake teeth is always in an outward state, and the rake teeth cannot play a gathering effect during the rotary discharge of materials, resulting in leakage and unloading. Summary of the invention

[0005] The purpose of the present invention is to provide a movable pollution-blocking device for the water inlet of a hydropower station, which can make the rake teeth retract inward to form an angle with the baffle plate, so as to better collect the salvaged floating objects. The grabbing can capture and collect smaller floating objects, such as leaves, branches, grass strips, etc. The rake teeth are placed at the back of the pollution-blocking fence to prevent interference with the fence and cause rake jamming failure.

[0006] The technical solution adopted by the present invention is as follows: The raker assembly is installed at the water inlet of the hydropower station, and comprises a frame, a raker fence, a chain belt transmission mechanism, a rake tooth assembly and a material baffle plate, wherein the frame is tilted and erected at the water inlet, and the raker fence is arranged on the water inlet surface of the frame so that the water inlet surface of the frame can allow water to flow through, the chain belt transmission mechanism is distributed along the inner cavity of the frame, and the chain on the chain belt transmission mechanism reciprocates up and down in the cavity of the frame, wherein when the chain belt transmission mechanism moves inside the frame, the space formed between the chain belt transmission mechanism and the cavity wall of the frame is a walking path, the rake tooth assembly is transversely arranged on the chain belt transmission mechanism, and the rake tooth assembly moves up and down in the walking path driven by the chain belt transmission mechanism, the rake tooth assembly starts to salvage from the bottom end of the frame and moves slowly upward, and the material baffle plate is transversely arranged inside the frame, and when the rake tooth assembly moves to the position of the material baffle plate, the rake tooth assembly flips inward to hold the salvaged material.

[0007] In a preferred embodiment, the trash interception fence comprises a plurality of low-surface fence plates equidistantly distributed on the water inlet surface of the frame, and the spacing between the plurality of low-surface fence plates forms a water inlet trough; The pollution interception fence also includes a high-surface fence plate arranged on the bottom surface of the frame; The bottom surface of the low-surface fence plate forms an outwardly convex triangular surface, and the position of the triangular surface is fixed to the top surface of the high-surface fence plate by a first reinforcing rib. The bottom surface of the high-surface fence plate is provided with a second reinforcing rib, and both ends of the second reinforcing rib are connected to the corresponding side walls of the frame.

[0008] In a preferred embodiment, the elevation of the high-surface fence plate is higher than that of the low-surface fence plate, so that the high-surface fence plate and its corresponding frame position form a cavity surface for the rake tooth assembly to rotate and move at the bottom of the frame.

[0009] In a preferred embodiment, the chain belt transmission mechanism includes a driving sprocket disposed transversely at the top of the frame; and a tension sprocket disposed horizontally with the drive sprocket; and A rotating sprocket is arranged at the bottom of the frame; wherein the sprockets are arranged on both sides of the frame, and the sprockets at corresponding positions are connected by a rotating shaft so that they can be fixedly rotated in the frame; The chain is drivingly connected to the driving sprockets, the tension sprocket and the rotary sprocket on both sides.

[0010] In a preferred embodiment, the rake tooth assembly comprises A fixing seat, the fixing seat is installed on the chains on both sides; and A connecting shaft, both ends of which are connected to the fixing seats on both sides, and fixing snap rings are equidistantly arranged on the connecting shaft, wherein the fixing snap rings are arranged corresponding to the low-surface fence plates, and a movable snap ring is rotatably sleeved between the two fixing snap rings.

[0011] In a preferred embodiment, the bottom surface of the fixed snap ring is grooved to form a notch, and two adjacent movable snap rings are connected by a connecting block located at the notch, so that the two adjacent movable snap rings can rotate together and be limited by the fixed snap ring.

[0012] In a preferred embodiment, the outer ring surface of the movable snap ring is provided with long-end rake teeth and short-end rake teeth extending outward on opposite sides, the length of the long-end rake teeth is greater than that of the short-end rake teeth, and the long-end rake teeth are used to salvage materials in the water inlet.

[0013] In a preferred embodiment, the material baffle plate is located behind the rake tooth assembly and on the inner upper side of the frame.

[0014] In a preferred embodiment, a first magnetic block is embedded on the side of the connection block facing the low-surface fence plate, and a second magnetic block is embedded on the surface of the fixing clamp corresponding to the first magnetic block, and the first magnetic block and the second magnetic block are adsorbed to each other.

[0015] In a preferred embodiment, when the rake tooth assembly does not reach the position of the material blocking plate, the long-end rake teeth are naturally drooped by gravity, and the long-end rake teeth are in an outward state; When the rake tooth assembly reaches the position of the material baffle plate, the bottom end of the short end rake tooth contacts the material baffle plate, is resisted and limited by the material baffle plate, and the long end rake tooth rotates to an inward state.

[0016] The technical effects achieved by the present invention are: Compared with the traditional fence, the present invention omits the reinforcing plate arranged horizontally in the middle. To ensure that the sewage interception fence can resist the impact of water flow for a longer time, the design of the convex triangle on the bottom surface of the low-surface fence plate can help to divert the water pressure, and is more helpful to help the fence resist the impact of water flow, so that the fence as a whole has better anti-punching performance. The position of the convex triangle is fixed to the top surface of the high-surface fence plate by the first reinforcing rib, and the bottom surface of the high-surface fence plate is fixed to the frame by the second reinforcing rib. The reinforcing plate originally arranged on the back of the fence is placed in front of the sewage interception fence. Without affecting the rotation and walking of the rake tooth assembly inside the frame, the structural integrity of the sewage interception fence is ensured, so that it is not easy to produce fatigue deformation after long-term use. The chain in the present invention rotates cyclically to drive the connecting shaft. When the connecting shaft is located at the bottom of the frame, the long-end rake teeth are in an outward state due to the long length of the long-end rake teeth under the influence of gravity. At this time, the first magnetic block and the second magnetic block are separated from each other. When the long-end rake teeth move upward, they salvage floating objects or large impurities and other garbage materials intercepted outside the interception fence. When the connecting shaft is located close to the baffle plate, the bottom end of the short-end rake teeth contacts the baffle plate, is blocked by the baffle plate and limited by the baffle plate, and the long-end rake teeth rotate inward. At this time, the first magnetic block and the second magnetic block are attracted to each other, and when the long-end rake teeth are inward, an angle is formed with the baffle plate, so as to better collect the salvaged floating objects, and clamp the salvaged dirt to move with the chain until it is discharged into the garbage truck, completing a self-cleaning, and then circulates and resets to the bottom of the frame to carry out the next salvage work; Compared with the traditional sewage interception device, the present invention changes the salvage rake teeth that move outside to move inside the frame. The improvement here is beneficial in that smaller floating objects, such as leaves, branches, grass strips, etc., can be captured and collected by grabbing behind the sewage interception fence, and the rake teeth are arranged at the back of the sewage interception fence, which is not easy to interfere with the fence and cause rake jamming failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of a half-section structure of the sewage interception device in the present invention; Figure 3 It is a schematic diagram of the structure of the rake tooth assembly in the present invention; Figure 4 It is a schematic diagram of the separation structure of the rake tooth assembly in the present invention; Figure 5 The present invention Figure 4 A detailed enlarged structural diagram of point A; Figure 6 It is a schematic diagram of a half-section structure of the sewage interception device in the present invention; Figure 7 The present invention Figure 6 A schematic diagram of the enlarged structure of the detail at B; Figure 8 The present invention Figure 6 Schematic diagram of the enlarged structure of the details at C.

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Water inlet; 2. Frame; 3. Trash interception fence; 301. Low-surface fence plate; 302. Water inlet trough; 303. High-surface fence plate; 304a. First reinforcing rib; 304b. Second reinforcing rib; 305. Cavity surface; 4. Chain belt transmission mechanism; 401. driving sprocket; 402. tension sprocket; 403. rotating sprocket; 404. chain; 5. Rake tooth assembly; 501. fixed seat; 502. connecting shaft; 503. fixed snap ring; 504. movable snap ring; 505. connecting block; 506. notch; 507. first magnetic block; 508. second magnetic block; 509a. long end rake tooth; 509b. short end rake tooth; 6. Walking path; 7. Material baffle. DETAILED DESCRIPTION

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0022] The sewage interception device based on the prior art is a rotary grille chain assembled by rake teeth. Driven by the motor reducer, the rake chain performs a rotary motion in the opposite direction of the water flow. When the rake chain runs to the upper part of the device, due to the guidance of the groove wheel and the curved rail, the solid matter on each group of rake teeth falls by gravity. The operating principle of the device involved in this application is almost the same as that of the traditional equipment, and the following improvements are made based on the traditional technology, specifically: Please refer to the attached Figure 1-6As shown, the present invention provides a movable trash intercepting device for a water inlet of a hydropower station, comprising the trash intercepting device installed at the water inlet 1 of the hydropower station, a frame 2, a trash intercepting fence 3, a chain belt transmission mechanism 4, a rake tooth assembly 5 and a material blocking plate 7, the frame 2 is tiltedly erected at the water inlet 1, the trash intercepting fence 3 is arranged on the water inlet surface of the frame 2, so that the water inlet surface of the frame 2 can allow water to pass through, the chain belt transmission mechanism 4 is distributed along the inner cavity of the frame 2, and the chain 404 on the chain belt transmission mechanism 4 reciprocates up and down in the cavity of the frame 2. Ring, wherein, when the chain belt transmission mechanism 4 moves inside the frame 2, the space formed between it and the cavity wall of the frame 2 is the walking path 6, the rake tooth assembly 5 is arranged horizontally on the chain belt transmission mechanism 4, and the rake tooth assembly 5 is driven by the chain belt transmission mechanism 4 to move up and down in the walking path 6, the rake tooth assembly 5 starts to salvage from the bottom end of the frame 2 and moves slowly upward, and the baffle plate 7 is horizontally arranged inside the frame 2. When the rake tooth assembly 5 moves to the position of the baffle plate 7, the rake tooth assembly 5 flips inward to hold the salvaged material.

[0023] See also Figure 2 or Figure 6 The sewage interception fence 3 includes a plurality of low-surface fence plates 301 equidistantly distributed on the water inlet surface of the frame 2, and the spacing between the plurality of low-surface fence plates 301 forms a water inlet trough 302. The sewage interception fence 3 also includes a high-surface fence plate 303 arranged on the bottom surface of the frame 2. The bottom surface of the low-surface fence plate 301 forms a convex triangular surface, and the position located on the triangular surface is fixed to the top surface of the high-surface fence plate 303 by a first reinforcing rib 304a. The bottom surface of the high-surface fence plate 303 is provided with a second reinforcing rib 304b, and both ends of the second reinforcing rib 304b are connected to the corresponding side walls of the frame 2. The vertical surface of the high-surface fence plate 303 is higher than the vertical surface of the low-surface fence plate 301, so that the high-surface fence plate 303 and the corresponding position of the frame 2 form a cavity surface 305 for the rake tooth assembly 5 to rotate and walk at the bottom of the frame 2.

[0024] Compared with traditional fences, the sewage interception fence 3 in the present application omits the reinforcing plate arranged horizontally in the middle. In order to ensure that the sewage interception fence 3 can resist the impact of water flow for a longer time, the design of the convex triangle on the bottom surface of the low-surface fence plate 301 can help divert the water pressure, and is more helpful to help the fence resist the impact of water flow, making the fence as a whole more resistant to impact. The convex triangle is fixed to the top surface of the high-surface fence plate 303 by the first reinforcing rib 304a, and the bottom surface of the high-surface fence plate 303 is fixed to the frame 2 by the second reinforcing rib 304b. The reinforcing plate originally arranged on the back of the fence is placed in front of the sewage interception fence 3. Without affecting the rotation and movement of the rake tooth assembly 5 inside the frame 2, the structural integrity of the sewage interception fence 3 is guaranteed, so that it is not easy to produce fatigue deformation after long-term use.

[0025] See also Figure 2The chain belt transmission mechanism 4 includes a driving sprocket 401 horizontally arranged at the top of the frame 2; a tension sprocket 402 horizontally arranged with the driving sprocket 401; and a rotating sprocket 403 arranged at the bottom of the frame 2; wherein the above-mentioned sprockets are arranged on both sides inside the frame 2, and the sprockets at corresponding positions are connected by a rotating shaft so that they can rotate in a fixed manner inside the frame 2, and the chain 404 is transmission-connected to the driving sprockets 401, the tension sprocket 402 and the rotating sprocket 403 on both sides.

[0026] Based on the above structure, the present application does not show in detail the device for driving the sprocket to rotate, and this part is not the main research direction of the present application. Any structure in the prior art that can drive the sprocket to rotate can be placed on the frame 2. The chain 404 can be driven to rotate in a circular manner by using an industrial motor to drive the sprocket to rotate. When the chain 404 rotates, the rake tooth assembly 5 arranged on the chain 404 rotates together, thereby realizing the process of salvaging and discharging the material on the rake teeth.

[0027] See also Figure 2 or Figure 3 , Figure 4 , Figure 5 The rake tooth assembly 5 includes a fixed seat 501 and a connecting shaft 502, and the fixed seat 501 is installed on the chains 404 on both sides; the two ends of the connecting shaft 502 are connected to the fixed seats 501 on both sides, and fixed snap rings 503 are equidistantly arranged on the connecting shaft 502, wherein the fixed snap rings 503 are arranged corresponding to the low-surface fence plate 301, and a movable snap ring 504 is rotatably sleeved between the two fixed snap rings 503, and the bottom surface of the fixed snap ring 503 is grooved to form a notch 506, and two adjacent movable snap rings 504 are connected by a connecting block 505, and the connecting block 505 is located at the position of the notch 506, so that the two adjacent movable snap rings 504 can rotate together and be limited by the fixed snap ring 503.

[0028] See also Figure 7 The outer ring surface of the movable clamping ring 504 is provided with long-end rake teeth 509a and short-end rake teeth 509b extending outward on opposite sides thereof. The length of the long-end rake teeth 509a is greater than that of the short-end rake teeth 509b. The long-end rake teeth 509a are used to salvage materials in the water inlet 1.

[0029] Specifically, the fixed snap ring 503 on the connecting shaft 502 corresponds to the fence plate setting, the movable snap ring 504 on the connecting shaft 502 corresponds to the water inlet trough 302, the length of the long end rake teeth 509a passes through the water inlet trough 302 and continues to extend outward. When the long end rake teeth 509a move upward, they catch garbage materials such as floating objects or large impurities intercepted outside the sewage intercepting fence 3, and as the chain 404 moves upward, the intercepted sewage is also driven upward.

[0030] Based on the above structure, the opening angle of the notch 506 is ninety degrees to sixty degrees, and the present application preferably takes sixty degrees as an example. The two movable snap rings 504 are connected by a connecting block 505, so that the rotation angle is limited by the size of the notch 506 on the bottom surface of the fixed snap ring 503. When rotating, the connecting block 505 is located inside the notch 506. As the connecting block 505 moves to different positions of the notch 506, the long-end rake teeth 509a on the movable snap ring 504 are driven to extend outward at different angles.

[0031] See also Figure 6 The material blocking plate 7 is located behind the rake tooth assembly 5 and on the inner upper side of the frame 2.

[0032] See also Figure 7 and Figure 8 A first magnetic block 507 is embedded on one side of the connecting block 505 facing the lower fence plate 301 , and a second magnetic block 508 is embedded on the surface of the fixing clamp 503 corresponding to the first magnetic block 507 , and the first magnetic block 507 and the second magnetic block 508 are adsorbed to each other.

[0033] See also Figure 7 and Figure 8 When the rake tooth assembly 5 does not reach the position of the material blocking plate 7, the long end rake teeth 509a are naturally drooped by gravity, and the long end rake teeth 509a are in an outward state; When the rake tooth assembly 5 reaches the position of the material baffle plate 7, the bottom end of the short end rake tooth 509b contacts the material baffle plate 7, is resisted and limited by the material baffle plate 7, and the long end rake tooth 509a rotates to an inward state.

[0034] In combination with the above structure, the chain 404 rotates cyclically to drive the connecting shaft 502. When the connecting shaft 502 is located at the bottom of the frame 2, due to the long length of the long end rake teeth 509a, the long end rake teeth 509a are in an extended state under the influence of gravity. At this time, the first magnetic block 507 and the second magnetic block 508 are away from each other. When the long end rake teeth 509a move upward, they salvage garbage materials such as floating objects or large impurities intercepted outside the waste interception fence 3; When the connecting shaft 502 is located close to the baffle plate 7, the bottom end of the short end rake tooth 509b contacts the baffle plate 7, is blocked by the baffle plate 7 and is limited by the baffle plate 7, and the long end rake tooth 509a rotates inwardly. At this time, the first magnetic block 507 and the second magnetic block 508 are attracted to each other. When the long end rake tooth 509a is retracted, it forms an angle with the baffle plate 7, which is convenient for better collecting the salvaged floating objects, and clamping the salvaged dirt to move with the chain 404 until it is discharged into the garbage truck, completing a self-cleaning, and then circulates and resets to the bottom of the frame 2 to carry out the next salvage work; Based on the above, compared with the traditional sewage interception device, the salvage rake teeth that move outside are changed to move inside the frame 2. The improvement here is beneficial in that the salvage rake teeth behind the sewage interception fence 3 can capture and collect smaller floating objects, such as leaves, branches, grass strips, etc., and the rake teeth are placed at the back of the sewage interception fence 3, which is not easy to interfere with the fence and cause rake jamming failure.

[0035] It is worth further explaining that the present application can match the fences with rake tooth chains according to the direction of water flow, and the gap between the long end rake teeth 509a assembled on the rake tooth assembly 5 can be selected according to the use conditions. When the rake teeth separate the solid suspended matter in the fluid, the water can flow smoothly. The whole working process is continuous or intermittent. The present device can effectively reduce the pollution load of the river, keep the water clean, and reduce the mechanical damage of the generator of the power station.

[0036] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A movable trash intercepting device for a water inlet of a hydropower station, the trash intercepting device being installed at the water inlet (1) of the hydropower station, characterized in that: include A frame (2), wherein the frame (2) is tilted and erected on the water inlet (1); A trash interception fence (3), wherein the trash interception fence (3) is arranged on the water inlet surface of the frame (2), so that the water inlet surface of the frame (2) allows water to flow through; A chain belt transmission mechanism (4), wherein the chain belt transmission mechanism (4) is distributed along the inner cavity of the frame (2), and the chain (404) on the chain belt transmission mechanism (4) reciprocates up and down in the cavity of the frame (2), wherein when the chain belt transmission mechanism (4) moves inside the frame (2), the space formed between the chain belt transmission mechanism (4) and the cavity wall of the frame (2) is a walking path (6); A rake tooth assembly (5), wherein the rake tooth assembly (5) is arranged transversely on the chain belt transmission mechanism (4), and the rake tooth assembly (5) moves up and down in a walking path (6) driven by the chain belt transmission mechanism (4), and the rake tooth assembly (5) starts to salvage from the bottom end of the frame (2) and moves slowly upward; A material baffle plate (7) is disposed transversely inside the frame (2); when the rake tooth assembly (5) moves to the position of the material baffle plate (7), the rake tooth assembly (5) turns over and buckles inward to catch the salvaged material.

2. The movable pollution-blocking device for the water inlet of a hydropower station according to claim 1, characterized in that: The pollution interception fence (3) comprises a plurality of low-surface fence plates (301) equidistantly distributed on the water inlet surface of the frame (2), and the spacing between the plurality of low-surface fence plates (301) forms a water inlet trough (302); The pollution interception fence (3) further comprises a high-surface fence plate (303) arranged on the bottom surface of the frame (2); The bottom surface of the low-surface fence plate (301) forms an outwardly convex triangular surface, and the position located on the triangular surface is fixed to the top surface of the high-surface fence plate (303) via a first reinforcing rib (304a), and the bottom surface of the high-surface fence plate (303) is provided with a second reinforcing rib (304b), and both ends of the second reinforcing rib (304b) are connected to the corresponding side walls of the frame (2).

3. The movable pollution-blocking device for the water inlet of a hydropower station according to claim 2, characterized in that: The vertical surface of the high-surface fence plate (303) is higher than the vertical surface of the low-surface fence plate (301), so that the high-surface fence plate (303) and the corresponding position of the frame (2) form a cavity surface (305) for the rake tooth assembly (5) to rotate and walk at the bottom of the frame (2).

4. The movable pollution-blocking device for the water inlet of a hydropower station according to claim 1, characterized in that: The chain belt transmission mechanism (4) comprises a driving sprocket (401) arranged transversely on the top of the frame (2); and a tension sprocket (402) disposed horizontally with the drive sprocket (401); and A rotating sprocket (403) is arranged at the bottom of the frame (2); wherein the sprockets are arranged on both sides of the frame (2) and connected to the sprockets at corresponding positions via a rotating shaft so that they can rotate in a fixed manner within the frame (2); The chain (404) is transmission-connected to the driving sprocket (401), the tension sprocket (402) and the rotating sprocket (403) on both sides.

5. A movable trash intercepting device for a water inlet of a hydropower station according to any one of claims 1 to 4, characterized in that: The rake tooth assembly (5) comprises A fixing seat (501), the fixing seat (501) being installed on the chains (404) on both sides; as well as A connecting shaft (502), the two ends of which are connected to the fixing seats (501) on both sides, and the connecting shaft (502) is provided with fixing rings (503) at equal intervals, wherein the fixing rings (503) are provided corresponding to the low-surface fence plate (301), and a movable ring (504) is rotatably sleeved between the two fixing rings (503).

6. The movable pollution-blocking device for the water inlet of a hydropower station according to claim 5, characterized in that: The bottom surface of the fixed snap ring (503) is grooved to form a notch (506), and two adjacent movable snap rings (504) are connected via a connecting block (505) disposed therebetween. The connecting block (505) is located at the position of the notch (506), so that the two adjacent movable snap rings (504) can rotate together and be limited by the fixed snap ring (503).

7. The movable pollution-blocking device for the water inlet of a hydropower station according to claim 6, characterized in that: The outer ring surface of the movable clamping ring (504) is provided with long-end rake teeth (509a) and short-end rake teeth (509b) extending outwards on opposite sides, respectively. The length of the long-end rake teeth (509a) is greater than that of the short-end rake teeth (509b). The long-end rake teeth (509a) are used to salvage materials in the water inlet.

8. The movable pollution-blocking device for the water inlet of a hydropower station according to claim 7, characterized in that: The material blocking plate (7) is located behind the rake tooth assembly (5) and on the upper inner side of the frame (2).

9. The movable pollution-blocking device for the water inlet of a hydropower station according to claim 8, characterized in that: A first magnetic block (507) is embedded on one side of the connection block (505) facing the lower fence plate (301), and a second magnetic block (508) is embedded on the surface of the fixing clamp (503) corresponding to the first magnetic block (507), and the first magnetic block (507) and the second magnetic block (508) are adsorbed to each other.

10. The movable pollution-blocking device for the water inlet of a hydropower station according to claim 8, characterized in that: When the rake tooth assembly (5) has not reached the position of the material blocking plate (7), the long end rake teeth (509a) are naturally drooped due to the influence of gravity, and the long end rake teeth (509a) are in an outward extension state; When the rake tooth assembly (5) reaches the position of the material baffle plate (7), the bottom end of the short end rake tooth (509b) contacts the material baffle plate (7), is resisted by the material baffle plate (7) and is limited by the material baffle plate (7), and the long end rake tooth (509a) rotates to an inwardly retracted state.

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