Multi-mode adjustable ecological check weir for preventing and controlling agricultural non-point source pollution

Abstract

This utility model relates to the field of water-retaining weir technology, specifically a multi-mode adjustable ecological water-retaining weir for controlling agricultural non-point source pollution. It includes a fixed weir base, with a flow channel fixed at the bottom and an embedding groove in the middle. A water-retaining weir plate is inserted into the embedding groove, and a lifting stud is mounted on the top of the water-retaining weir plate, penetrating and suspended below the top plate. The water-retaining weir plate includes an upper weir plate, a middle weir plate, and a lower weir plate, which are respectively inserted into the upper, middle, and lower positions within the embedding groove and are interconnected. In its construction and use, this utility model upgrades the traditional single-function water-retaining weir to a composite functional system of "water flow interception + flexible height adjustment + simultaneous pollutant purification," and incorporates a bottom channel to prevent siltation and promote biological connectivity, making it more convenient and efficient to use.

Description

Technical Field

[0001] This utility model relates to the field of water-retaining weir technology, specifically a multi-mode adjustable ecological water-retaining weir for preventing and controlling agricultural non-point source pollution. Background Technology

[0002] In the field of water conservancy engineering, weirs, as low-head water retention structures, are widely used in the management of small and medium-sized rivers, water resource regulation, soil and water conservation, and ecological restoration. Their core functions are to impound water, raise water levels, and regulate water flow speed, while also taking into account practical needs such as flood control, drainage, and irrigation water supply. They are of great significance for maintaining regional water resource balance and river ecological stability. In agricultural non-point source pollution control projects, weirs are widely used in ecological interception ditches to raise water levels and prolong the hydraulic residence time of farmland runoff in the ditches, so as to promote the sedimentation and degradation of pollutants such as nitrogen and phosphorus.

[0003] For example, Chinese patent application number CN202421420900.7 discloses an automatic water-retaining wall for the outlet cofferdam of the river section of the river pumping station in an ecologically sensitive urban area. It includes a retaining wall body, a side wall movably connected to the top of the retaining wall body, a column movably connected to one side of the side wall, a hydraulic pump movably connected to the top of the column, a telescopic rod set on the top of the hydraulic pump, a gate movably connected to the top of the telescopic rod, a first slider fixedly connected to the outer wall of the gate, a water storage chamber set on the top of the retaining wall body, a support rod movably connected to the inner wall of the water storage chamber, a second sliding groove set on the inner wall of the retaining wall body, and a deep insertion hole inserted into the bottom of the column.

[0004] However, common weirs are mainly fixed weirs, with weir plates and other structures constructed of brick or concrete, and a fixed weir crest height. They cannot dynamically adjust the water level according to the crop's flood tolerance, easily affecting crop growth. Furthermore, they only have a single function of blocking water and allowing flow, unable to assist in the adsorption and degradation of pollutants such as nitrogen, phosphorus, and COD in farmland runoff, limiting their purification efficiency. In addition, being in the humid and saline environment of farmland runoff for extended periods, ordinary materials are easily corroded by water and microorganisms, leading to cracking, rusting, and aging, resulting in short service life and high maintenance and replacement costs. Traditional weirs often use overflow at the weir crest, resulting in slow water flow. The silt carried by farmland runoff easily accumulates in front of the weir and at the bottom of the ditch, requiring regular manual dredging, which is a significant maintenance workload. At the same time, traditional weirs block the migration channels of benthic organisms or small aquatic organisms in ecological interception ditches, severing the ecological connectivity of the water area and disrupting the ecological balance and biodiversity of the ditch.

[0005] Therefore, in order to solve the above problems, a multi-mode adjustable ecological weir for preventing and controlling agricultural non-point source pollution is proposed. Utility Model Content

[0006] The purpose of this invention is to provide a multi-mode adjustable ecological weir for preventing and controlling agricultural non-point source pollution, so as to solve the problems mentioned in the background art, such as the single function, poor purification capacity, lack of biological channels, poor corrosion resistance, and non-adjustable height of existing weir materials.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a multi-mode adjustable ecological water-retaining weir for preventing agricultural non-point source pollution, comprising a fixed weir base, wherein the bottom of the fixed weir base is cast and installed at the bottom and both sides of the interception ditch wall, and a top plate is fixedly supported on the top of the fixed weir base; a flow channel is fixedly installed at the bottom of the fixed weir base, and an embedding groove is opened in the middle of the fixed weir base; a water-retaining weir plate is inserted and assembled inside the embedding groove, and a lifting stud is assembled on the top of the water-retaining weir plate, and the lifting stud is inserted through and suspended below the top plate; the water-retaining weir plate includes an upper weir plate, a middle weir plate, and a lower weir plate, and the upper weir plate, the middle weir plate, and the lower weir plate are respectively inserted into the upper, middle, and lower positions inside the embedding groove and are connected end to end.

[0008] The above-mentioned technical means facilitate the multi-level adjustment and raising of the weir plate according to the needs of use. With the assistance of the weir plate, it is also easy to adsorb, degrade and purify agricultural non-point source pollutants. At the same time, with the cooperation of the flow channel, it helps to prevent siltation and biological interconnection.

[0009] As a further step of this solution, the upper weir plate is provided with an inner support layer, and the inner support layer is wrapped with an adsorption and degradation layer. The adsorption and degradation layer is wrapped with a corrosion-resistant layer. The inner support layer, the adsorption and degradation layer and the corrosion-resistant layer are surrounded by an outer frame on the top, bottom and sides. The middle weir plate and the lower weir plate are similarly provided.

[0010] The above-mentioned technical means facilitate water blocking while purifying and adsorbing water through the design of the inner and outer composite structure, making it more convenient to use.

[0011] As a further step of this solution, a top baffle is integrally fixed to the upper front part of the outer jacket frame, and a corresponding bottom baffle is integrally fixed to the lower rear part of the outer jacket frame. The upper weir plate, middle weir plate and lower weir plate are sequentially inserted and assembled into the three sets of mounting slots from front to back. The upper part of the middle weir plate is located behind the lower part of the upper weir plate, and the lower part of the middle weir plate is located in front of the upper part of the lower weir plate. The bottom of the lower weir plate is inserted into the bottom of the mounting slot.

[0012] The aforementioned technical means facilitate the multi-stage lifting and lowering of the water-retaining weir plate, making adjustment and use more convenient.

[0013] As a further step of this solution, the three sets of mounting slots are arranged in parallel from front to back on the inner side of the fixed weir base, and the inner wall of the mounting slot is fixed with a corresponding slide rail. The outer walls of the outer sleeve are fixed with side slide bars, and the side slide bars are inserted into the slide rail. The side slide bars are equipped with rollers, and the outer wall of the roller rolls back and forth and up and down on the inner wall of the slide rail. The rollers are fitted with pins through bearings, and the pins are fixed to the side wall of the side slide bars.

[0014] The above-mentioned technical means facilitate the vertical lifting and sliding adjustment of the upper weir plate, middle weir plate, and lower weir plate, making them more convenient to use.

[0015] As a further step in this solution, a lifting frame is fixed to the center of the outer sleeve surface of the top of the upper weir plate by bolts, and the top of the lifting frame is fixed to the bottom of the lifting stud by nuts. A pull cap is integrally fixed to the bottom wall of the lifting stud, and a bottom slot corresponding to the pull cap is opened in the inner top wall of the lifting frame. A threaded sleeve is threaded on the outer wall of the lifting stud, and the outer wall of the threaded sleeve is installed in the center of the top plate surface through a bearing. A worm gear is fixed on the outer wall of the threaded sleeve, and a worm is meshed on the rear side of the worm gear. A servo motor is connected to the side end of the worm through a coupling. The two sides of the worm are supported on the top plate surface by bearings with seats, and the servo motor is also supported on the top plate surface.

[0016] The aforementioned technical means facilitate the auxiliary hoisting and lifting of the water-retaining weir plate, making subsequent adjustments more convenient.

[0017] As a further step of this solution, a bottom frame is fixed to the bottom side of the servo motor, and an outer cover is provided on the outside of the bottom frame. The outer cover has heat dissipation holes on its side. A maintenance cover is provided on the outside of the worm gear and worm. The upper part of the maintenance cover is sleeved on the outside of the upper wall of the threaded sleeve through a bearing. The end of the worm away from the servo motor extends to the outer wall of the maintenance cover, and a throttle is fixed to the outer end of the worm. A grip is inserted and assembled on the side end of the throttle.

[0018] The aforementioned technical means facilitate the support and maintenance of the upper components, making them safer and more convenient to use.

[0019] As a further step of this solution, the flow channels are longitudinally distributed from front to back at the bottom of the fixed weir base. The top of the flow channels is arched, and the bottom of the flow channels is concave. The bottom of the flow channels is paved with granular stone. Limiting grooves corresponding to the top plate are opened on both sides of the top of the fixed weir base. Climbing frames are evenly and equidistantly fixed on both sides of the outer wall of the fixed weir base from top to bottom.

[0020] The above-mentioned technical means facilitate the stable support and vertical movement of the fixed weir foundation on the sides and top, and also facilitate the prevention of siltation and biological connectivity at the bottom.

[0021] Compared with the prior art, the beneficial effects of this utility model are: this utility model is convenient;

[0022] This utility model, by incorporating a water-retaining weir plate and lifting studs, facilitates the vertical movement of the weir plate under the support of the studs. Furthermore, the composite material layers of the inner and outer weir plate enhance the adsorption and degradation of agricultural non-point source pollutants, thus aiding in purification. The segmented design of the upper, middle, and lower weir plates allows for multi-mode vertical adjustment. For example, when lowering is needed, the upper and middle weir plates can be lowered sequentially to facilitate overflow, or the upper weir plate can be raised to drive the middle and lower weir plates upwards sequentially, facilitating rapid drainage from the bottom. This design enhances the convenience and practicality of the ecological water-retaining weir.

[0023] This utility model incorporates a flow channel and an embedding groove. The flow channel, in conjunction with the flow channel, facilitates the connection between the two sides at the bottom, allowing the sediment carried by farmland runoff to flow in front of the weir and at the bottom of the ditch, preventing siltation. It also creates an ecological interception channel for the migration of benthic organisms or small aquatic organisms within the ditch, without disrupting the ecological connectivity of the water area or damaging the ecological balance and biodiversity of the ditch. Furthermore, the embedding groove makes vertical sliding adjustment more convenient. This design improves the convenience and practicality of the ecological water-retaining weir. Attached Figure Description

[0024] Figure 1 This is a frontal perspective three-dimensional schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a rear-view perspective view of the overall structure of this utility model;

[0026] Figure 3 This is a top view sectional perspective of the structure of this utility model;

[0027] Figure 4 This is a three-dimensional side view sectional view of a partial structure of the hoisting stud of this utility model;

[0028] Figure 5 This is a three-dimensional side view sectional view of a partial structure of the fixed weir foundation of this utility model;

[0029] Figure 6 This is a three-dimensional side view sectional view of a partial structure of the water-retaining weir plate of this utility model;

[0030] In the diagram: 100, Fixed weir base; 101, Interception ditch wall; 102, Top plate; 103, Limiting groove; 104, Climbing frame; 105, Flow channel; 106, Granulated stone; 110, Embedding groove; 111, Slide rail; 120, Water-retaining weir plate; 121, Upper weir plate; 122, Middle weir plate; 123, Lower weir plate; 124, Inner support layer; 125, Adsorption and degradation layer; 126, Corrosion-resistant layer; 1270, Outer frame; 1271. 1272 Top baffle; 1280 Side slide bar; 1281 Roller; 1282 Pin; 130 Lifting stud; 1310 Lifting frame; 1311 Pull cap; 1312 Bottom slot; 132 Threaded sleeve; 133 Worm gear; 134 Worm; 135 Servo motor; 1360 Base frame; 1361 Outer cover; 137 Maintenance cover; 138 Screw sleeve; 1390 Throttle; 1391 Handle. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Please see Figures 1-6 One embodiment provided by this utility model:

[0033] A multi-mode adjustable ecological water-retaining weir for preventing agricultural non-point source pollution includes a fixed weir base 100. The bottom of the fixed weir base 100 is cast and installed at the bottom and both sides of the interception ditch wall 101, and a top plate 102 is fixedly supported on the top of the fixed weir base 100. A flow channel 105 is fixedly installed at the bottom of the fixed weir base 100, and an embedding groove 110 is opened in the middle of the fixed weir base 100. A water-retaining weir plate 120 is inserted and installed inside the embedding groove 110. A lifting stud 130 is installed on the top of the water-retaining weir plate 120 and is inserted through and suspended below the top plate 102. The water-retaining weir plate 120 includes an upper weir plate 121, a middle weir plate 122, and a lower weir plate 123. The upper weir plate 121, the middle weir plate 122, and the lower weir plate 123 are respectively inserted into the upper, middle, and lower positions inside the embedding groove 110 and are connected to each other end to end.

[0034] Therefore, when constructing and using it, the traditional single function of water-blocking weirs is upgraded to a composite functional system of "water flow interception + flexible height adjustment + simultaneous pollutant purification", as well as the bottom channel for preventing siltation and biological connectivity, making it more convenient and efficient to use.

[0035] As described in more detail in this embodiment, the upper weir plate 121 is provided with an inner support layer 124, and the inner support layer 124 is wrapped with an adsorption and degradation layer 125. The adsorption and degradation layer 125 is wrapped with a corrosion-resistant layer 126. The inner support layer 124, the adsorption and degradation layer 125 and the corrosion-resistant layer 126 are wrapped with an outer frame 1270 around the upper, lower and sides. The middle weir plate 122 and the lower weir plate 123 are similarly provided.

[0036] Therefore, during use, the corrosion-resistant layer 126 and the adsorption and degradation layer 125 facilitate the adsorption, degradation, and purification of pollutants in the water, making it more convenient to use. The outer frame 1270 facilitates the installation and maintenance of the outer perimeter of the upper weir plate 121, middle weir plate 122, and lower weir plate 123, and also facilitates subsequent stable adjustment and raising. Furthermore, the inner support layer 124 is made of high-strength reinforced concrete or alloy steel profiles, providing core structural strength and ensuring the stability of the weir under the impact of water flow. Safety and durability; the adsorption and degradation layer 125 is made of zeolite-iron oxide composite porous ceramic material, which retains pollutants such as ammonia nitrogen, total phosphorus, and organic matter through physical adsorption and chemical action; the corrosion-resistant layer 126 is made of porous modified epoxy resin anti-corrosion and water-permeable coating or stainless steel microporous mesh plate, which can freely allow water molecules and dissolved nitrogen, phosphorus, COD and other pollutants to pass through, while blocking large particles of silt, resisting corrosion from farmland runoff, and preventing weathering and leakage of the internal structure; and the outer frame 1270 is made of stainless steel and coated with anti-rust and anti-corrosion paint.

[0037] As described in more detail in this embodiment, a top baffle 1271 is integrally fixed to the upper front part of the outer frame 1270, and a corresponding bottom baffle 1272 is integrally fixed to the lower rear part of the outer frame 1270. The upper weir plate 121, the middle weir plate 122, and the lower weir plate 123 are sequentially inserted and assembled into the three sets of mounting slots 110 from front to back. The upper part of the middle weir plate 122 is located behind the lower part of the upper weir plate 121, and the lower part of the middle weir plate 122 is located in front of the upper part of the lower weir plate 123. The bottom of the lower weir plate 123 is inserted into the bottom of the mounting slot 110.

[0038] This facilitates the distribution and installation of the upper weir plate 121, middle weir plate 122, and lower weir plate 123, and allows for gradual lifting and lowering adjustments. Specifically, when it is necessary to lower the upper weir plate 121 and middle weir plate 122 to allow water to overflow from the top, the hoisting stud 130 is lowered, causing the upper weir plate 121 to descend with its own weight. Furthermore, with the cooperation of the bottom baffle 1272 at the bottom of the upper weir plate 121, the hook support on the upper front baffle 1271 of the middle weir plate 122 is released, allowing the upper weir plate 121 and middle weir plate 122 to gradually descend. The bottom baffle 1272 at the rear bottom of the upper weir plate 121 and the front baffle 1272 of the middle weir plate 122 are then lowered. With the cooperation of the top baffle 1271 on the side top, the relative sealing between the upper weir plate 121 and the middle weir plate 122 is assisted, making the descent adjustment more convenient. Conversely, when it is necessary to rise to pass through the bottom, the hoisting stud 130 is operated to rise, which drives the upper weir plate 121 to rise. With the cooperation of the bottom baffle 1272 on the rear side of the bottom of the upper weir plate 121, the top baffle 1271 on the front top of the middle weir plate 122 is hooked, thereby driving the middle weir plate 122 to rise, and also driving the lower weir plate 123 to rise. This makes it easier for the water to be discharged through the gap between the bottom of the lower weir plate 123 and the bottom of the fixed weir base 100, realizing multi-mode adjustment and making it more convenient to use.

[0039] As described in more detail in this embodiment, three sets of mounting slots 110 are arranged in parallel from front to back on the inner side of the fixed weir base 100, and corresponding slide rails 111 are fixed on the inner wall of the mounting slots 110. Side slide bars 1280 are fixed on the outer walls of both sides of the outer sleeve 1270, and the side slide bars 1280 are inserted into the slide rails 111. Rollers 1281 are provided inside the side slide bars 1280, and the outer wall of the rollers 1281 rolls back and forth and up and down on the inner wall of the slide rails 111. A pin 1282 is installed inside the rollers 1281 through a bearing, and the pin 1282 is fixed to the side wall of the side slide bar 1280.

[0040] Therefore, during use, the slide rail 111 facilitates the internal lifting and lowering of the auxiliary side slide bar 1280. Combined with the stable lifting and lowering of the upper weir plate 121, middle weir plate 122 and lower weir plate 123, and the roller 1281, the lifting and lowering becomes more convenient and efficient, reducing friction damage between the side of the upper weir plate 121 and the mounting groove 110 and the side of the slide rail 111, making operation and use more convenient.

[0041] As described in more detail in this embodiment, a lifting frame 1310 is fixed to the center of the outer sleeve 1270 at the top of the upper weir plate 121 by bolts, and the top of the lifting frame 1310 is fixed to the bottom of the lifting stud 130 by nuts. A pull cap 1311 is integrally fixed to the bottom wall of the lifting stud 130, and a bottom slot 1312 corresponding to the pull cap 1311 is opened on the inner top wall of the lifting frame 1310. A threaded sleeve 132 is threaded on the outer wall of the lifting stud 130. The outer wall of the threaded sleeve 132 is installed in the center of the surface of the top plate 102 by bearings. A worm gear 133 is fixed on the outer wall of the threaded sleeve 132, and a worm 134 is meshed on the rear side of the worm gear 133. A servo motor 135 is connected to the side end of the worm 134 by a coupling. The two sides of the worm 134 are supported on the surface of the top plate 102 by bearings with seats, and the servo motor 135 is supported on the surface of the top plate 102.

[0042] Thus, with the cooperation of the lifting frame 1310, it is convenient to connect and assemble the lifting stud 130 and the water-blocking weir plate 120, and also convenient for subsequent disassembly, maintenance and replacement. Subsequently, driven by the servo motor 135, the worm gear 134 and worm wheel 133 drive the threaded sleeve 132 to rotate, and with the cooperation of the threads, the lifting stud 130 is driven to rise and fall, making it more convenient to use and easier to adjust and control. After the lifting and adjustment, it remains relatively stationary with the cooperation of the self-locking principle of the worm wheel 133 and worm gear 134, making the support more stable and convenient.

[0043] As described in more detail in this embodiment, a bottom frame 1360 is fixedly provided on the bottom side of the servo motor 135, and an outer cover 1361 is provided on the outside of the bottom frame 1360. The outer cover 1361 has heat dissipation holes on its side. A maintenance cover 137 is provided on the outside of the worm gear 133 and the worm 134. The upper part of the maintenance cover 137 is sleeved on the outside of the upper wall of the threaded sleeve 132 through a bearing. The end of the worm 134 away from the servo motor 135 extends to the outer wall of the maintenance cover 137. A throttle 1390 is fixedly provided on the outer end of the worm 134, and a grip 1391 is inserted and assembled on the side of the throttle 1390.

[0044] Therefore, during use, the base frame 1360 and the outer cover 1361 facilitate the maintenance of the servo motor 135, making it safer to use when powered on. The maintenance cover 137 facilitates the maintenance of the worm gear 133 and worm 134, making subsequent transmission more stable. With the throttle 1390 and the grip 1391, it is also convenient to manually rotate in an emergency, making the operation safer and more convenient. When supporting for a long time, the screw sleeve 138 can be tightened to maintain the limit. When frequent lifting and lowering are required, the screw sleeve 138 can be removed, making it more convenient to use.

[0045] As described in more detail in this embodiment, the flow channels 105 are longitudinally distributed from front to back at the bottom of the fixed weir base 100. The top of the flow channels 105 is arched, and the bottom of the flow channels 105 is concave. The bottom of the flow channels 105 is paved with granular stone material 106. Limiting grooves 103 corresponding to the top plate 102 are opened on both sides of the top of the fixed weir base 100. Climbing frames 104 are evenly and equidistantly fixed on both sides of the outer wall of the fixed weir base 100 from top to bottom.

[0046] Therefore, during use, it facilitates stable support for the top plate 102 and facilitates subsequent disassembly and maintenance. Furthermore, with the assistance of the climbing frame 104, it facilitates climbing up and down from the side, making maintenance and inspection more convenient. The granular stone material 106, made of pebbles and gravel, facilitates easy flow. The presence of the flow channel 105 solves the problem of sediment carried by farmland runoff easily depositing in front of the weir and at the bottom of the ditch due to reduced flow velocity, thus reducing maintenance requirements. The flow channel 105 is also designed as a biological channel, effectively solving the problem of traditional weirs disrupting the ditch ecosystem. During non-regulation periods, the flow channel 105 remains connected, providing a stable migration channel and habitat for aquatic organisms such as fish, amphibians, and benthic animals, ensuring the normal survival and material cycle of microorganisms, aquatic plants, and benthic organisms, enhancing the ditch's natural purification and self-repair capabilities, and achieving a win-win situation of "pollution interception" and "ecological protection."

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or equivalent variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are considered equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A multi-mode adjustable ecological water-retaining weir for preventing agricultural non-point source pollution, comprising a fixed weir base (100), wherein the bottom of the fixed weir base (100) is cast and installed at the bottom and both sides of the interception ditch wall (101), and a top plate (102) is fixedly supported on the top of the fixed weir base (100). Its features are: The fixed weir base (100) is fixed with a flow channel (105) at the bottom, and a mounting groove (110) is opened in the middle of the fixed weir base (100). A water-blocking weir plate (120) is inserted and installed inside the mounting groove (110), and a lifting stud (130) is installed on the top of the water-blocking weir plate (120). The lifting stud (130) is inserted through and suspended below the top plate (102). The water-blocking weir plate (120) includes an upper weir plate (121), a middle weir plate (122) and a lower weir plate (123). The upper weir plate (121), the middle weir plate (122) and the lower weir plate (123) are respectively inserted in the upper, middle and lower positions inside the mounting groove (110) and are connected to each other.

2. The multi-mode adjustable ecological water-retaining weir for controlling agricultural non-point source pollution according to claim 1, characterized in that: The upper weir plate (121) is provided with an inner support layer (124), and the inner support layer (124) is wrapped with an adsorption and degradation layer (125). The adsorption and degradation layer (125) is wrapped with a corrosion-resistant layer (126). The inner support layer (124), the adsorption and degradation layer (125) and the corrosion-resistant layer (126) are wrapped with an outer frame (1270) around the top, bottom and sides. The middle weir plate (122) and the lower weir plate (123) are similarly provided.

3. The multi-mode adjustable ecological water-retaining weir for controlling agricultural non-point source pollution according to claim 2, characterized in that: The upper front end of the outer frame (1270) is integrally fixed with a top baffle (1271), and the lower rear end of the outer frame (1270) is integrally fixed with a corresponding bottom baffle (1272). The upper weir plate (121), the middle weir plate (122) and the lower weir plate (123) are sequentially inserted and assembled in the three sets of mounting slots (110) from front to back. The upper part of the middle weir plate (122) is located on the lower rear side of the upper weir plate (121), and the lower part of the middle weir plate (122) is located on the upper front side of the lower weir plate (123). The bottom of the lower weir plate (123) is inserted into the bottom of the mounting slot (110).

4. The multi-mode adjustable ecological water-retaining weir for controlling agricultural non-point source pollution according to claim 2, characterized in that: The three sets of mounting slots (110) are arranged in parallel from front to back on the inner side of the fixed weir base (100), and the inner wall of the mounting slot (110) is fixed with a corresponding slide rail (111). The outer walls of the outer sleeve (1270) are fixed with side slide strips (1280), and the side slide strips (1280) are inserted into the slide rail (111). The side slide strips (1280) are equipped with rollers (1281), and the outer wall of the rollers (1281) rolls back and forth and up and down on the inner wall of the slide rail (111). The rollers (1281) are fitted with pins (1282) through bearings, and the pins (1282) are fixed to the side wall of the side slide strips (1280).

5. A multi-mode adjustable ecological weir for controlling agricultural non-point source pollution according to claim 2, characterized in that: A lifting frame (1310) is bolted to the center of the outer sleeve (1270) at the top of the upper weir plate (121), and the top of the lifting frame (1310) is fastened to the bottom of the lifting stud (130) with nuts. A pull cap (1311) is integrally fixed to the bottom wall of the lifting stud (130), and a bottom groove (1312) corresponding to the pull cap (1311) is opened on the inner top wall of the lifting frame (1310). A threaded sleeve (1312) is threaded onto the outer wall of the lifting stud (130). 2) The outer wall of the threaded sleeve (132) is installed in the center of the surface of the top plate (102) through a bearing. The outer wall of the threaded sleeve (132) is fixed with a worm wheel (133), and a worm (134) is meshed on the rear side of the worm wheel (133). The side end of the worm (134) is connected to a servo motor (135) through a coupling. The two sides of the worm (134) are supported on the surface of the top plate (102) through bearings with seats, and the servo motor (135) is supported on the surface of the top plate (102).

6. A multi-mode adjustable ecological weir for controlling agricultural non-point source pollution according to claim 5, characterized in that: The servo motor (135) has a bottom frame (1360) fixed on its bottom side, and the bottom frame (1360) is covered with an outer cover (1361). The outer cover (1361) has heat dissipation holes on its side. The worm gear (133) and worm (134) are covered with a maintenance cover (137). The upper part of the maintenance cover (137) is sleeved on the outside of the upper wall of the threaded sleeve (132) through a bearing. The end of the worm (134) away from the servo motor (135) extends to the outer wall of the maintenance cover (137). The outer end of the worm (134) is fixed with a throttle (1390), and the side end of the throttle (1390) is fitted with a handle (1391).

7. A multi-mode adjustable ecological weir for controlling agricultural non-point source pollution according to claim 1, characterized in that: The flow channels (105) are longitudinally distributed from front to back at the bottom of the fixed weir base (100). The top of the flow channels (105) is arched, and the bottom of the flow channels (105) is concave. The bottom of the flow channels (105) is paved with granular stone (106). The top two sides of the fixed weir base (100) are provided with limiting grooves (103) corresponding to the top plate (102). Climbing frames (104) are evenly and equidistantly fixed on the outer walls of both sides of the fixed weir base (100) from top to bottom.

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