A river flood control device and flood control method for river repair and defense projects

Abstract

The present invention relates to the technical field of river channel repair and defense engineering, and specifically to a river channel flood control device for river channel repair and defense engineering, comprising a filter screen arranged between two river channels, the flood control device further comprising a flood control cloth connected to the filter screen, a switching mechanism provided between the filter screen and the flood control cloth, the switching mechanism comprising a reeling roller and a reeling roller, one side of the flood control cloth being connected to the reeling roller, one side of the filter screen being connected to the reeling roller, a guide roller being further provided at the connection between the filter screen and the flood control cloth, and a support mechanism being further provided on the back side of the filter screen facing the water surface between the two river channels. The present invention ensures that the river can flow normally under normal circumstances, and also ensures that the flow rate can be slowed down when the river is turbulent, thereby improving the flood control effect, maintaining the cleanliness of the river, and reducing the flow of garbage with the river. The present invention also relates to a river channel flood control method for river channel repair and defense engineering.

Description

Technical Field

[0001] The present invention relates to the technical field of river channel repair and defense engineering, in particular to a river channel flood control device for river channel repair and defense engineering, and also to a river channel flood control method for river channel repair and defense engineering. Background Art

[0002] In general river planning, flood control channels are reserved and flood control devices are installed. During the rainy season, the flood control devices have a flood discharge function, which enables the river to have a certain flood control capacity. However, when the flood control devices are not in use during the non-flood season, the flow rate in the river is relatively slow. After encountering the flood control devices, the silt and stones on the riverbed will be blocked in front of the flood control devices. The flood control devices will only be fully opened during flood discharge. However, heavy rains do not occur often, which causes the flood control devices to not be opened under normal circumstances, resulting in silt and stones being deposited in front of the flood control devices.

[0003] The currently published Chinese patent CN201910929737.4 is a river flood control device for river repair and defense projects, comprising: a base, a track and a limit block are arranged in the base, the track is arranged obliquely, the limit block is located on the track, gate piers are arranged on both sides of the river, the gate piers are located above the base, the gate is arranged between the gate piers, the gate is used to seal and open the river, a support rod is arranged in the middle of the top of the gate, a fixing frame is connected to the support rod, the support rod is threadedly connected to the fixing frame, the fixing frame is located above the gate pier, a silt treatment mechanism, silt The mud treatment mechanism is arranged on the gate pier, and the two silt treatment mechanisms are arranged opposite to each other. The silt treatment mechanism includes a water pump, which is connected to the upper end of the outer shell and is located above the gate pier; a conveyor belt, the shaft of the conveyor belt is connected to the inner side of the outer shell; an arc plate, the arc plate is connected to the outer surface of the conveyor belt; a protrusion, the protrusion is arranged on the outer surface of the outer shell; a roller, the roller is arranged at the bottom of the outer shell; a silt treatment tank, the silt treatment tank is located below the water pump, and the upper end of the silt treatment tank is connected to the opening at the upper end of the outer shell; one end of the silt treatment tank is connected to the gate pier.

[0004] According to the above patent, the patent uses a river flood prevention device for the river repair and defense project, which can ensure water quality while clearing silt and will not make the water turbid. However, the patent is not effective in preventing floods and cleaning up garbage. The discharged silt remains in the river and needs to be cleaned up later, which is rather cumbersome. Therefore, there is a need for a device that can effectively block garbage and effectively prevent floods. Summary of the Invention

[0005] In response to the problems existing in the existing technology, a river flood control device is provided for river repair and defense projects. The present invention ensures that the river can flow normally under normal circumstances by switching back and forth between the filter screen and the flood control cloth, and also ensures that the flow rate can be slowed down when the river is turbulent, thereby improving the flood control effect, keeping the river clean, and reducing the flow of garbage in the river.

[0006] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0007] The present invention provides a river flood control device for river channel repair and defense projects, including a filter screen arranged between two river channels, the flood control device also includes a flood control cloth connected to the filter screen, the flood control cloth is perpendicular to the filter screen, the lower halves of the filter screen and the flood control cloth are both located in water, a switching mechanism is provided between the filter screen and the flood control cloth for adjusting the positions of the two, the switching mechanism is provided with a unwinding roller and a winding roller, the unwinding roller and the winding roller are respectively arranged on a river channel, one side of the flood control cloth is connected to the unwinding roller, one side of the filter screen is connected to the winding roller, a guide roller is further provided at the connection between the filter screen and the flood control cloth, the guide roller and the winding roller are symmetrically arranged, a fixed shaft connection seat for rotatably connecting the unwinding roller is provided at the end portion corresponding to the unwinding roller on the river channel, a movable shaft connection seat for rotatably connecting the winding roller and the guide roller is provided at the end portion corresponding to the winding roller and the guide roller on the river channel, and a supporting mechanism is further provided between the two river channels and on the back side facing the water front surface of the filter screen.

[0008] Preferably, the support mechanism is provided with a plurality of support strips, which are evenly spaced along the surface of the filter screen. A shaft-connected strip for rotatably connecting the ends of the support strips is provided between the movable shaft-connected seats of the winding roller and the guide roller. A deflection assembly for simultaneously rotating all the support strips is provided on the shaft-connected strip. When the plurality of support strips are kept vertical to the filter screen, a water passage is formed between every two adjacent support strips.

[0009] Preferably, a buffer connection is provided between the movable shaft connection seat and the corresponding river channel, the buffer connection seat is provided with a guide seat fixed on the surface of the river channel, a guide rod is extended from the movable shaft connection seat and passes through the guide seat, the end of the guide rod is provided with an anti-slip end head, and a buffer spring mounted on the guide rod is fixedly connected between the anti-slip end head and the guide seat.

[0010] Preferably, the upper and lower ends of the supporting strips are provided with coaxial wheels therewith, the filter screen is located between the two wheels, a rotating shaft is rotatably connected between the supporting strips and the shaft-connected strips, the upper end of the rotating shaft extends upward, and a torsion spring sleeved on the rotating shaft is fixedly connected between the rotating shaft and the shaft-connected strips.

[0011] Preferably, the deflection assembly is provided with a plurality of shift plates fixedly sleeved on the upper end of each rotating shaft. When the torsion spring is in a normal state, every two adjacent shift plates are in a flush state. A first pull rope spanning all the shift plates is provided on the shaft-connecting strip. One end of the first pull rope is fixedly connected to the movable shaft connection seat of the guide roller, and the other end of the first pull rope is fixedly connected to the shaft-connecting strip.

[0012] Preferably, a groove is provided on the surface of the guide roller along its axial direction, and the surface where the flood control cloth contacts the guide roller has corrugated teeth that match the groove.

[0013] Preferably, a first positioning rod for the first pull rope to surround is provided on the axially connected strip near the guide roller, and a second positioning rod for the first pull rope to surround is provided on the axially connected strip near the winding roller. When the first pull rope is in a taut state, a complete plate-like structure is formed between the several supporting strips.

[0014] Preferably, the end of the paddle has a beveled edge on the side facing the winding roller that contacts the first pull rope.

[0015] Preferably, a second pull rope is connected around the upper and lower ends of the flood-control cloth and the unwinding roller, a fixed connecting piece is provided between the second pull rope and the flood-control cloth, and a flexible connecting belt is provided between the flood-control cloth and the filter screen.

[0016] The present invention also provides a river flood prevention method for a river repair and defense project, comprising the following steps:

[0017] S1, sensing the height of the river water through the existing water level sensor;

[0018] S2: The water level of the river is normal, and the filter screen remains in the position across the two river channels to block the garbage;

[0019] S3: When the river water level is abnormal, the filter screen is cut out through the switching mechanism, and the flood control cloth is switched to a position facing the river water;

[0020] S4, combining a plurality of support strips into a plate-like structure through a deflection assembly to support the flood control cloth;

[0021] S5, when the river water hits the flood control cloth or filter, the buffer connector plays a buffering role.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The present invention ensures the normal flow of the river under normal circumstances by switching back and forth between the filter screen and the flood control cloth, and also ensures that the flow rate can be slowed down when the river is turbulent, thereby realizing the flood control capability of the river, improving the flood control effect, and keeping the river clean, reducing the flow of garbage with the river.

[0024] 2. The present invention drives the support strips through the deflection assembly, so that the support strips can be deflected. When a water channel is formed between every two adjacent support strips, it is beneficial to the normal flow of river water. When all the support strips are combined to form a complete plate-like structure, it is beneficial to support the flood control cloth, realizing the normal flow of the river under normal conditions and stabilizing the flood control cloth under the impact of floods in turbulent river conditions, thereby improving the flood resistance of the flood control cloth.

[0025] 3. The present invention connects the movable shaft seat and the river channel through a buffer connector, so that the river and the flood control cloth can be effectively buffered when fighting against the river, thereby protecting the filter screen and the flood control cloth, avoiding damage caused by excessive impact of the river, and improving the flood control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural diagram of a river flood control device used in river repair and defense projects;

[0027] Figure 2 It is a top view of a river flood control device used in river repair and defense projects;

[0028] Figure 3 A schematic diagram of the three-dimensional structure of a river channel flood control device used in river channel repair and defense projects without the river channel. Figure 1 ;

[0029] Figure 4 A schematic diagram of the three-dimensional structure of a river channel flood control device used in river channel repair and defense projects without the river channel. Figure 2 ;

[0030] Figure 5 A schematic diagram of the three-dimensional structure of a river channel flood control device used in river channel repair and defense projects without the river channel. Figure 2 The main view;

[0031] Figure 6 yes Figure 5 Cross-sectional view at AA;

[0032] Figure 7 yes Figure 5 A three-dimensional structural cross-sectional view at AA;

[0033] Figure 8 A schematic diagram of the three-dimensional structure of a river channel flood control device used in river channel repair and defense projects without the river channel. Figure 2 A top view of

[0034] Figure 9 yes Figure 6 An enlarged schematic diagram of point B;

[0035] Figure 10 yes Figure 4 Enlarged schematic diagram of point C.

[0036] The numbers in the figure are:

[0037] 1- River channel;

[0038] 2-Filter;

[0039] 3-flood control cloth; 31-corrugated teeth; 32-second pull rope; 33-fixed connector; 34-flexible connecting belt;

[0040] 4-Switching mechanism;

[0041] 41- unwinding roller; 411- fixed shaft connector; 412- unwinding motor;

[0042] 42-winding roller; 421-movable shaft connector; 422-winding motor;

[0043] 43-guide roller; 431-card slot;

[0044] 44-buffer connector; 441-guide seat; 442-guide rod; 4421-anti-slip end; 443-buffer spring;

[0045] 5-Support mechanism;

[0046] 51-supporting strips;

[0047] 52-shaft connecting plate; 521-rotating wheel; 522-rotating shaft; 5221-torsion spring;

[0048] 53-deflection assembly; 531-shift plate; 532-first pull rope; 533-first positioning rod; 534-second positioning rod. DETAILED DESCRIPTION

[0049] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] See also Figure 1-Figure 7 As shown, a river flood control device for river channel repair and defense engineering includes a filter screen 2 arranged between two river channels 1, and the flood control device also includes a flood control cloth 3 connected to the filter screen 2. The flood control cloth 3 is perpendicular to the filter screen 2. The lower halves of the filter screen 2 and the flood control cloth 3 are both located in the water. A switching mechanism 4 is provided between the filter screen 2 and the flood control cloth 3 for adjusting the positions of the two. The switching mechanism 4 is provided with a reel 41 and a reel 42. The reel 41 and the reel 42 are respectively arranged on one river channel 1, and one side of the flood control cloth 3 is connected to the reel 41. 41 is connected, one side of the filter screen 2 is connected to the winding roller 42, and a guide roller 43 is further provided at the connection between the filter screen 2 and the flood control cloth 3. The guide roller 43 and the winding roller 42 are symmetrically arranged. A fixed shaft connection seat 411 for rotating connection of the unwinding roller 41 is provided at the end of the river channel 1 corresponding to the unwinding roller 41, and a movable shaft connection seat 421 for rotating connection of the winding roller 42 and the guide roller 43 is provided at the end of the river channel 1 corresponding to the winding roller 42 and the guide roller 43. A supporting mechanism 5 is also provided between the two river channels 1 and on the back side facing the water surface of the filter screen 2.

[0051] The fixed shaft connection seat 411 is provided with an unwinding motor 412 for driving the unwinding roller 41, and the movable shaft connection seat 421 is provided with a winding motor 422 for driving the winding roller 42;

[0052] When the river is in normal condition, the filter 2 is located between the two river channels 1, blocking the garbage floating in the river, and the garbage is regularly salvaged by cleaning staff;

[0053] When the river is turbulent, the reeling motor 422 and the unreeling motor 412 are driven simultaneously, and the reeling roller 42 reels the filter screen 2, while the flood control cloth 3 is simultaneously pulled between the two river channels 1. The flood control cloth 3 has a decelerating effect on the river, causing the river to impact the flood control cloth 3, slowing the flow rate and playing a flood prevention role. When the river impacts the flood control cloth 3, the support mechanism 5 supports the side of the flood control cloth 3 facing away from the river, ensuring the stability of the flood control cloth 3 and preventing it from being washed away by the flood. When the river flow returns to normal, the switching mechanism 4 withdraws the filter screen 2 and moves it between the two river channels 1. The flood control cloth 3 is located on the surface of the river channel 1, does not affect the flow of the river, and also blocks garbage.

[0054] See also Figure 6-Figure 8 As shown, the support mechanism 5 is provided with a plurality of support strips 51, which are evenly spaced along the surface of the filter screen 2. A shaft-connected strip 52 for rotatably connecting the ends of the support strips 51 is provided between the movable shaft-connected seat 421 of the winding roller 42 and the guide roller 43. A deflection assembly 53 for simultaneously rotating all the support strips 51 is provided on the shaft-connected strip 52. When the plurality of support strips 51 are kept vertical to the filter screen 2, a water passage is formed between every two adjacent support strips 51.

[0055] When the flood control cloth 3 is switched to block floods, the cooperation between the guide roller 43 and the deflection assembly 53 triggers all the supporting strips 51 to flip simultaneously and in the same direction. All the supporting strips 51 are combined to form a complete plate structure. The flood control cloth 3 is wrapped on the plate structure to stabilize the flood control cloth 3 from the impact of the flood. When the river flows normally, the filter screen 2 is between the two river channels 1, and a water channel is formed between every two supporting strips 51, so that the river can flow normally through the filter screen 2 and the water channel.

[0056] See also Figure 7 and Figure 8 As shown, a buffer connector 44 is provided between the movable shaft connector 421 and the corresponding river channel 1. The buffer connector 44 is provided with a guide seat 441 fixed on the surface of the river channel 1. A guide rod 442 is extended from the movable shaft connector 421 and passes through the guide seat 441. The end of the guide rod 442 is provided with an anti-slip end 4421. A buffer spring 443 mounted on the guide rod 442 is fixedly connected between the anti-slip end 4421 and the guide seat 441.

[0057] When the river water hits the filter screen 2 or the flood control cloth 3, the impact force of the river is slowed down by the buffer connector 44. When the river passes through the filter screen 2 or hits the flood control cloth 3, the movable shaft seat 421 slides under the cooperation of the guide rod 442 and the guide seat 441, and the buffer spring 443 becomes compressed to play a buffering effect. When the river is calm, the buffer spring 443 is compressed.

[0058] See also Figure 7 and Figure 10 As shown, the upper and lower ends of the supporting strip 51 are provided with coaxial rotating wheels 521, the filter screen 2 is located between the two rotating wheels 521, and a rotating shaft 522 is rotatably connected between the supporting strip 51 and the axis-connected strip 52. The upper end of the rotating shaft 522 extends upward, and a torsion spring 5221 sleeved on the rotating shaft 522 is fixedly connected between the rotating shaft 522 and the axis-connected strip 52.

[0059] When the river is calm, the torsion spring 5221 is in a normal state, and every two adjacent supporting strips 51 are in a flush state, thereby forming a water passage, effectively allowing the river to flow normally. When the flood control cloth 3 resists floods, all the supporting strips 51 are deflected in the same direction, and the torsion spring 5221 is in a twisted state, combining into a plate-like structure to support the flood control cloth 3, effectively mitigating the impact.

[0060] See also Figure 8 and Figure 10 As shown, the deflection assembly 53 is provided with a plurality of shift plates 531 fixedly sleeved on the upper end of each rotating shaft 522. When the torsion spring 5221 is in a normal state, every two adjacent shift plates 531 are in a flush state. The shaft connecting plate 52 is provided with a first pull rope 532 spanning all the shift plates 531. One end of the first pull rope 532 is fixedly connected to the movable shaft connecting seat 421 of the guide roller 43, and the other end of the first pull rope 532 is fixedly connected to the shaft connecting plate 52.

[0061] When the deflection assembly 53 cooperates with the guide roller 43, during the process of winding the filter screen 2, the flood control cloth 3 will move around the guide roller 43, prompting the guide roller 43 to rotate. During the rotation of the guide roller 43, the first pull rope 532 is tightened. Since the first pull rope 532 is in contact with all the paddles 531, the paddles 531 are pushed to rotate after the first pull rope 532 is pulled, thereby prompting all the paddles 531 to be combined into a plate-like structure. After the flood control cloth 3 is moved between the two river channels 1, the plate-like structure is also assembled, which effectively stabilizes the flood control cloth 3.

[0062] See also Figure 9 As shown, a groove 431 is provided on the surface of the guide roller 43 along its axial direction, and the surface where the flood control cloth 3 contacts the guide roller 43 has corrugated teeth 31 that match the groove 431 .

[0063] When the flood control cloth 3 moves along the guide roller 43 , the groove 431 on the guide roller 43 fits with the corrugated teeth 31 on the flood control cloth 3 , thereby ensuring the rotation of the guide roller 43 and pulling the first pull rope 532 .

[0064] See also Figure 8 As shown, a first positioning rod 533 for the first pull rope 532 to surround is provided on the axis-connected strip 52 near the guide roller 43, and a second positioning rod 534 for the first pull rope 532 to surround is provided on the axis-connected strip 52 near the winding roller 42. When the first pull rope 532 is in a taut state, a complete plate-like structure is formed between the several supporting strips 51.

[0065] When the first pull rope 532 is pulled, the first pull rope 532 is pulled around the first positioning rod 533 and the second positioning rod 534, which has a guiding effect on the first pull rope 532 and ensures that the first pull rope 532 can completely deflect all the shift plates 531.

[0066] See also Figure 8 As shown, the end of the dial plate 531 facing the winding roller 42 has an oblique edge that contacts the first pull rope 532 .

[0067] When the first pull rope 532 is pulled, the oblique side of the shift plate 531 contacts the first pull rope 532 , which helps to drive the shift plate 531 to rotate and avoid the first pull rope 532 and the shift plate 531 from getting stuck.

[0068] See also Figure 7-Figure 9 As shown, a second pull rope 32 is connected between the upper and lower ends of the flood control cloth 3 and the unwinding roller 41, a fixed connecting piece 33 is provided between the second pull rope 32 and the flood control cloth 3, and a flexible connecting belt 34 is provided between the flood control cloth 3 and the filter screen 2.

[0069] When the filter screen 2 is rolled up, the flood control cloth 3 is pulled between the two river channels 1, and the second pull rope 32 connected to the flood control cloth 3 is loosened on the unwinding roller 41 until the flood control cloth 3 is between the two river channels 1. The winding roller 42 stops rolling up the filter screen 2. The filter screen 2 and the flood control cloth 3 are connected by a flexible connecting belt 34, which does not affect the pulling and is convenient for replacing the filter screen 2 or the flood control cloth 3.

[0070] A river flood prevention method for a river repair and defense project comprises the following steps:

[0071] S1, sensing the height of the river water through the existing water level sensor;

[0072] S2, the water level of the river is normal, and the filter 2 remains in the position across the two river channels 1 to block the garbage;

[0073] S3: When the water level of the river is abnormal, the filter screen 2 is cut out by the switching mechanism 4, and the flood control cloth 3 is switched to a position facing the river water;

[0074] S4, combining a plurality of support strips 51 into a plate-like structure through the deflection assembly 53 to support the flood control cloth 3;

[0075] S5, when the river water hits the flood control cloth 3 or the filter screen 2, the buffer connector 44 has a buffering effect.

[0076] The present invention ensures that the river can flow normally under normal circumstances by switching back and forth between the filter screen 2 and the flood control cloth 3, and also ensures that the flow rate can be slowed down when the river is turbulent, thereby improving the flood control effect, keeping the river clean, and reducing the flow of garbage in the river.

[0077] The above embodiments merely represent one or several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A river flood control device for a river repair and defense project, comprising a filter screen (2) arranged between two river channels (1); It is characterized in that The flood control device further comprises a flood control cloth (3) connected to the filter screen (2), the flood control cloth (3) is perpendicular to the filter screen (2), the lower halves of the filter screen (2) and the flood control cloth (3) are both located in water, a switching mechanism (4) is provided between the filter screen (2) and the flood control cloth (3) for adjusting the positions of the two, the switching mechanism (4) is provided with a reeling roller (41) and a reeling roller (42), the reeling roller (41) and the reeling roller (42) are respectively provided on a river channel (1), one side of the flood control cloth (3) is connected to the reeling roller (41), and one side of the filter screen (2) is connected to the reeling roller (42). The connection between the filter screen (2) and the flood control cloth (3) is also provided with a guide roller (43), the guide roller (43) and the winding roller (42) are symmetrically arranged, the end of the river channel (1) corresponding to the unwinding roller (41) is provided with a fixed shaft connection seat (411) for the unwinding roller (41) to be rotatably connected, the end of the river channel (1) corresponding to the winding roller (42) and the guide roller (43) is provided with a movable shaft connection seat (421) for the winding roller (42) and the guide roller (43) to be rotatably connected, and a support mechanism (5) is also provided between the two river channels (1) and on the back side facing the water surface of the filter screen (2); The support mechanism (5) is provided with a plurality of support strips (51), and the plurality of support strips (51) are distributed at equal intervals along the surface of the filter screen (2). A shaft-connected strip (52) for rotatably connecting the ends of the support strips (51) is provided between the reeling roller (42) and the movable shaft-connected seat (421) of the guide roller (43). A deflection assembly (53) for simultaneously rotating all the support strips (51) is provided on the shaft-connected strip (52). When the plurality of support strips (51) and the filter screen (2) are kept in a vertical state, a water passage is formed between every two adjacent support strips (51). A buffer connector (44) is provided between the movable shaft connector (421) and the corresponding river channel (1), the buffer connector (44) is provided with a guide seat (441) fixed on the surface of the river channel (1), a guide rod (442) extending from the movable shaft connector (421) and passing through the guide seat (441), an anti-slip end (4421) is provided at the end of the guide rod (442), and a buffer spring (443) sleeved on the guide rod (442) is fixedly connected between the anti-slip end (4421) and the guide seat (441); The upper and lower ends of the support strip (51) are both provided with coaxial rotating wheels (521), the filter screen (2) is located between the two rotating wheels (521), a rotating shaft (522) is rotatably connected between the support strip (51) and the shaft-connected strip (52), the upper end of the rotating shaft (522) extends upward, and a torsion spring (5221) sleeved on the rotating shaft (522) is fixedly connected between the rotating shaft (522) and the shaft-connected strip (52); The deflection assembly (53) is provided with a plurality of shift plates (531) fixedly sleeved on the upper end of each rotating shaft (522); when the torsion spring (5221) is in a normal state, every two adjacent shift plates (531) are in a flush state; a first pull rope (532) spanning all the shift plates (531) is provided on the shaft connecting strip (52); one end of the first pull rope (532) is fixedly connected to the movable shaft connecting seat (421) of the guide roller (43); and the other end of the first pull rope (532) is fixedly connected to the shaft connecting strip (52); A first positioning rod (533) for the first pull rope (532) to surround is provided on the axis-connected strip plate (52) at a position close to the guide roller (43), and a second positioning rod (534) for the first pull rope (532) to surround is provided on the axis-connected strip plate (52) at a position close to the winding roller (42). When the first pull rope (532) is in a taut state, a complete plate-like structure is formed between the plurality of support strip plates (51).

2. A river flood control device for river repair and defense engineering according to claim 1, characterized in that: The surface of the guide roller (43) is provided with a slot (431) along its axial direction, and the surface where the flood control cloth (3) contacts the guide roller (43) has corrugated teeth (31) that match the slot (431).

3. A river flood control device for river repair and defense engineering according to claim 1, characterized in that: The end of the dial plate (531) facing the winding roller (42) has an oblique edge in contact with the first pull rope (532).

4. A river flood control device for river repair and defense engineering according to claim 1, characterized in that: A second pull rope (32) is connected between the upper and lower ends of the flood control cloth (3) and the unwinding roller (41), a fixed connecting piece (33) is provided between the second pull rope (32) and the flood control cloth (3), and a flexible connecting belt (34) is provided between the flood control cloth (3) and the filter screen (2).

5. A river flood control method for a river repair and defense project, using a river flood control device for a river repair and defense project according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1, sensing the height of the river water through the existing water level sensor; S2, the water level of the river is normal, and the filter (2) remains in a position across the two river channels (1) to block the garbage; S3, when the water level of the river is abnormal, the filter screen (2) is cut out by the switching mechanism (4), and the flood control cloth (3) is switched to a position facing the river water; S4, combining a plurality of support strips (51) into a plate-like structure through a deflection assembly (53) to support the flood control cloth (3); S5, when the river water impacts the flood control cloth (3) or the filter (2), a buffering effect is achieved through the buffer connector (44).

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