A tidal flow constructed wetland tailwater sediment secondary degradation device and use method

Abstract

The application discloses a tidal flow artificial wetland tail water sediment secondary degradation device and a use method, and belongs to the technical field of tidal flow wetland sediment treatment. The device comprises a rigid support and a rotating motor. The top of the rigid support is supported by a rigid supporting plate, and a tail end plate is installed on the rigid supporting plate. A plurality of telescopic mechanisms are installed on the rigid supporting plate. The rotating motor is suitable for driving the plurality of telescopic mechanisms to extend and retract. The output end of the plurality of telescopic mechanisms is provided with a scraper, and the scraper moves on the rigid supporting plate. The rigid supporting plate is arranged to be inclined, and a mounting notched plate is arranged on the side away from the tail end plate. The device further comprises a stirring motor, which is installed in the mounting notched plate. The bottom of the stirring motor is provided with a slurry conveying part, which pumps the stirred slurry to the surface of the wetland soil layer. The application can ensure that the urban tail water can be fully degraded twice by stirring or depositing the mixture in the tidal water flow during the rising tide and the falling tide of the tidal flow artificial wetland, and then conveying the mixture back to the wetland.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of tidal flow wetland sediment treatment, and particularly relates to a secondary degradation device for tail water sediment of a tidal flow artificial wetland and a use method thereof. BACKGROUND

[0002] For the tidal flow artificial wetland, the two sides of the wetland edge line include a soil layer and a water surface layer, and the soil layer is mostly in the form of an inclined surface under water, and the soil layer is mostly planted with green plants for soil fixation and water storage above water.

[0003] Under the action of tides, a large part of the tail water sediment at the wetland is not completely treated and is drifted on the water surface layer with the tidal flow and flows into or out of the lake, causing the proportion of surface pollutants at the edge of the lake to be large. At the same time, part of the wetland soil also flows into the lake with the tidal flow. Over a long period of time, the inner edge of the lake embankment is moved, the depth of the lake is reduced, the wetland vegetation soil is insufficient, and the vitality of the vegetation is reduced.

[0004] Therefore, a secondary degradation device for tail water sediment of a tidal flow artificial wetland and a use method thereof as mentioned in the application are needed. SUMMARY

[0005] The application aims to provide a secondary degradation device for tail water sediment of a tidal flow artificial wetland and a use method thereof, which can ensure that the urban tail water can be fully degraded for the second time and the wetland water and soil can be maintained by precipitating the mixture in the tidal flow from the tidal flow artificial wetland during the rising tide and the falling tide and retransporting the mixture back to the wetland.

[0006] To achieve the above-mentioned purpose, the application provides the following technical scheme:

[0007] A secondary degradation device for tail water sediment of a tidal flow artificial wetland, comprising a sediment secondary recovery system, a sediment scattering system and an intelligent sensing system, wherein the sediment secondary recovery system is located on the wetland edge line.

[0008] The sediment secondary recovery system comprises a rigid support and a rotary motor, the top of the rigid support is supported by a rigid supporting plate, a tail end plate is fixedly installed on the rigid supporting plate, a supporting framework is installed on the side of the tail end plate, and the bottom end of the supporting framework is fixedly connected with the rigid supporting plate.

[0009] A plurality of telescopic mechanisms are installed on the rigid supporting plate, the rotary motor is suitable for driving the plurality of telescopic mechanisms to extend and retract, the output end of the plurality of telescopic mechanisms is provided with a scraper, and the scraper moves on the rigid supporting plate.

[0010] The rigid supporting plate is arranged in an inclined manner, and a mounting notched plate is arranged on the side away from the tail end plate, and the bottom of the mounting notched plate abuts against the wetland edge line.

[0011] The sediment scattering system comprises a stirring motor, which is installed in the installation notch plate; the bottom of the stirring motor is provided with a mud conveying part, which is suitable for pumping the stirred mud to the surface of the wetland soil layer.

[0012] In a further technical solution, the tail end plate is provided with a dense mesh net on one side of the multi-section telescopic mechanism, the dense mesh net is fixedly installed on the tail end plate, and the bottom of the scraper is provided with a steel wire ball brush which is suitable for being attached to the surface of the rigid support plate.

[0013] In a further technical solution, the mud conveying part comprises a mud conveying pipe, a circular table is installed in the installation notch plate, and a mud discharging cavity is formed in the bottom, the circular table, the mud discharging cavity and the installation notch plate are connected in communication.

[0014] The output end of the stirring motor is upwardly provided with a cutting blade and located in the circular table; the middle part of the mud discharging cavity is provided with a fixing cylinder, the stirring motor is installed in the fixing cylinder, the fixing cylinder is fixedly connected with the circular table, and the bottom of the mud discharging cavity is connected with the mud conveying pipe in communication.

[0015] In a further technical solution, the mud conveying part further comprises a mud power pump and a rotary mud spray head, the pump body of the mud power pump is provided with a support platform one, the support platform is fixed on the wetland soil layer, the mud conveying pipe passes through the support platform one, and the top of the mud conveying pipe is provided with the rotary mud spray head, the mud power pump is suitable for pumping the sediment in the installation notch plate after being stirred by the stirring motor and pumping the sediment to the rotary mud spray head for spraying.

[0016] In a further technical solution, the installation notch plate is provided with a support platform two away from the rigid support plate, the support platform two is suitable for being fixed on the wetland soil layer, and the top of the support platform two is provided with a motor support, and the top of the motor support is fixedly provided with a rotary motor.

[0017] In a further technical solution, the intelligent sensing system comprises a time control switch, a water level sensor one and a water level sensor two, the time control switch is connected with the water level sensor one and the water level sensor two through respective installation wires; the water level sensor one is installed on the motor support, and the water level sensor two is installed at the installation notch plate.

[0018] In a further technical solution, the multi-section telescopic mechanism comprises a first telescopic section, a second telescopic section and a third telescopic section, and the diameters gradually decrease; the output end of the rotary motor is provided with a screw rod, and the end of the screw rod away from the rotary motor extends into the second telescopic section and is threadedly connected.

[0019] In a further technical solution, the multi-section telescopic mechanism further comprises a fourth telescopic section, a cable limiting block is mounted in the first telescopic section, the second telescopic section, the third telescopic section and the fourth telescopic section, and a pulley and a cable are mounted on the second telescopic section and the third telescopic section; the cable limiting block is fixedly connected with the cable;

[0020] The pulleys are arranged in pairs on the second telescopic section and the third telescopic section respectively; and the cable is wound around the pulleys;

[0021] A bottom screw block is formed in the second telescopic section, and the screw rod is threadedly connected with the bottom screw block.

[0022] In a further technical solution, a guide groove is arranged on the outer side of the second telescopic section, a guide column is arranged in the first telescopic section, the guide column is fixedly connected with the first telescopic section, and the guide column is matched with the guide groove; the third telescopic section is fixedly connected with the end of the second telescopic section and located on the end side away from the first telescopic section; and a sealing plate is mounted on the outer end of the second telescopic section.

[0023] A use method of a tidal flow artificial wetland tail water sediment secondary degradation device, comprising the following steps:

[0024] Step S1: The sediment secondary recovery system, the sediment scattering system and the intelligent sensing system are installed at the position of the artificial wetland and fixed.

[0025] Step S2: The time control switch, the water level sensor one and the water level sensor two are connected with the corresponding rotating motor, stirring motor and mud power pump respectively.

[0026] In other stages, the time control switch is not connected with all circuits, and the equipment is not working.

[0027] Step S3: When the tide rises, the time control switch controls a single circuit to be connected in the rising tide stage, so as to ensure that the rotating motor works; the water level sensor one is respectively provided with an extension sensing area and a retraction sensing area; when the tide rises to the extension sensing area, the rotating motor is positively transmitted, the multi-section telescopic mechanism is elongated, and the scraper is sent back to the tail end plate;

[0028] The elongation action of the multi-section telescopic mechanism: the rotating motor rotates, the screw rod rotates and pushes the second telescopic section to move upward through the bottom screw block; at the same time, since the cable limiting block of the first telescopic section is fixedly connected with the cable, the limiting block does not move with the pulley, drives the cable limiting block on the third telescopic section to move upward, and the third telescopic section moves upward at the same time; similarly, the fourth telescopic section also moves upward with the third telescopic section.

[0029] Step S4: When the tide recedes, the time switch is turned on through the water level sensor 1, and the time switch controls all circuits to be connected during the tide recession stage; when the water level drops to the retraction sensing area during the tide recession, the rotary motor is reversed, the multi-section telescopic mechanism is shortened, and the scraper is pulled to move; at this time, the steel ball brush is in front of the rigid support plate to loosen the deposited sediment, and the sediment is pushed to the installation notch plate of the rigid support plate by the rear scraper;

[0030] The stirring motor is controlled through the water level sensor 2, and the stirring is uniform; and then the slurry power pump is pumped back into the artificial wetland;

[0031] Step S5: The water level sensor is divided into a stirring sensing area, a power pneumatic area and a stop area from top to bottom;

[0032] When the water level continues to drop to the stirring sensing area, the excess lake water has overflowed outwards from the overflow hole, the stirring motor is started, and the remaining sediment scraped by the scraper is fully stirred;

[0033] Step S6: When the water level continues to drop to the power start area, the stirring motor stops, and the slurry power pump starts to pump the sediment in the groove and the slurry to the rotary slurry nozzle through the slurry conveying pipe; the sediment and lake water mixture is sprayed again to the soil layer of the wetland by the rotary slurry nozzle for secondary degradation;

[0034] When the water level continues to drop to the stop area, no new sediment enters the installation notch plate, and the stirring motor and the slurry power pump are stopped.

[0035] Advantages

[0036] 1) The present application utilizes the rising and falling characteristics of the tidal flow to operate, so that the slurry power pump, the rotary motor and the stirring motor are automatically controlled through the different position heights of the water level sensor 1 and the water level sensor 2, the conditions for intelligent processing of sediment stirring and recovery are achieved, and process automation is realized.

[0037] 2) Each component is detachable, maintainable, reusable, flexible and reliable, and has certain practicality.

[0038] 3) The present application can change the size and shape of each component according to the actual topography, has the advantage of adapting to local conditions, and can be used in any shaped artificial wetland.

[0039] 4) The present application operates during the rising and falling tide process, avoids the cumbersome work of separating and transporting the sediment after it enters the lake water, and the equipment and instruments are relatively simple and have operability. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0041] Figure 1 The overall structure schematic diagram of the sediment secondary degradation device of the present application;

[0042] Figure 2 The A part enlarged view of Figure 1 ;

[0043] Figure 3 The detail schematic diagram of the multi-section telescopic mechanism, rigid supporting plate and scraper plate of the present application;

[0044] Figure 4 The schematic diagram of the multi-section telescopic mechanism of the present application;

[0045] Figure 5 The schematic diagram of the information processing system of the present application;

[0046] Figure 6 The sectional view of the multi-section telescopic mechanism of another embodiment of the present application.

[0047] In the figure: 1, rigid support; 2, rigid supporting plate; 3, tail end plate; 4, close-meshed supporting net; 5, scraper plate; 6, steel wire ball brush; 7, supporting framework; 8, multi-section telescopic mechanism; 9, rotary motor; 10, motor support; 11, stirring motor; 12, mud conveying pipe; 13, mud power pump; 14, rotary mud spray head; 15, time control switch; 17, water level inductor I; 18, water level inductor II; 19, first-order telescopic section; 20, second-order telescopic section; 21, third-order telescopic section; 22, fourth-order telescopic section; 23, pulley; 24, cable; 25, cable limiting block; 26, screw rod; 27, overflow hole; 28, bottom screw block; 29, stretching inductive area; 30, retracting inductive area; 31, stirring inductive area; 33, power starting area; 34, stopping area; 35, installation notch plate; 36, circular table stand; 37, mud unloading cavity; 38, cutting piece; 39, fixed cylinder; 40, supporting platform I; 41, supporting platform II; 42, guide groove; 43, guide column; 44, sealing plate. DETAILED DESCRIPTION

[0048] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the following will further describe the present application in combination with embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application.

[0049] The application principle of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0050] Example 1

[0051] Please see Figures 1-5 As shown, this is one embodiment of the present invention, providing a secondary degradation device for sediments in the tailwater of an artificial wetland with tidal flow, including a sediment secondary recovery system, a sediment distribution system, and an intelligent sensing system; the sediment secondary recovery system is located on the edge of the wetland.

[0052] The sediment secondary recovery system includes a rigid support 1 and a rotary motor 9. The top of the rigid support 1 is supported by a rigid support plate 2. A tail end plate 3 is fixedly installed on the rigid support plate 2. A support frame 7 is installed on the side of the tail end plate 3. The bottom end of the support frame 7 is fixedly connected to the rigid support plate 2.

[0053] A multi-section telescopic mechanism 8 is installed on the rigid support plate 2. A rotary motor 9 is adapted to drive the multi-section telescopic mechanism 8 to extend and retract. A scraper 5 is installed at the output end of the multi-section telescopic mechanism 8. The scraper 5 moves on the rigid support plate 2.

[0054] The rigid support plate 2 is inclined and has a mounting recess 35 on the side away from the tail end plate 3. The bottom of the mounting recess 35 abuts against the edge of the wetland.

[0055] The sediment dispersing system includes a stirring motor 11, which is installed inside a mounting recess 35; a mud conveying device is installed at the bottom of the stirring motor 11, which is suitable for pumping the stirred mud to the surface of the wetland soil layer.

[0056] like Figure 3 As shown, a dense mesh support net 4 is installed on one side of the tail end plate 3 relative to the multi-section telescopic mechanism. The dense mesh support net 4 is fixedly installed on the tail end plate 3. A steel wool brush 6 is installed at the bottom of the scraper 5. The steel wool brush 6 is suitable for adhering to the surface of the rigid support plate 2.

[0057] like Figure 2 As shown, the mud conveying component includes a mud conveying pipe 12, a frustum frame 36 installed inside the mounting recess plate 35, and a mud unloading chamber 37 opened at the bottom. The frustum frame 36, the mud unloading chamber 37 and the mounting recess plate 35 are connected.

[0058] The output end of the stirring motor 11 faces upward and is equipped with a cutting blade 38, which is located inside the frustum frame 36; a fixed cylinder 39 is provided in the middle of the mud discharge chamber 37, and the stirring motor 11 is installed inside the fixed cylinder 39. The fixed cylinder 39 is fixedly connected to the frustum frame 36, and the bottom of the mud discharge chamber 37 is connected to the mud conveying pipe 12.

[0059] The mud conveying part further comprises a mud power pump 13 and a rotary mud nozzle 14. The pump body of the mud power pump 13 is provided with a support platform I 40, and the support platform I 40 is fixed on the wetland soil layer. The mud conveying pipe 12 penetrates through the support platform I 40, and the top of the mud conveying pipe 12 is provided with the rotary mud nozzle 14. The mud power pump 13 is suitable for pumping the sediments stirred by the stirring motor 11 into the installation notched plate 35 and pumping the sediments to the rotary mud nozzle 14 for spraying.

[0060] The intelligent sensing system comprises a time control switch 15, a water level sensor I 17 and a water level sensor II 18. The time control switch 15 is electrically connected to the water level sensor I 17 and the water level sensor II 18 through the respective installation of electric wires. The water level sensor I 17 is installed on the motor support 10, and the water level sensor II 18 is installed at the installation notched plate 35.

[0061] As shown in Figure 4 The multi-section telescopic mechanism comprises a first telescopic section 19, a second telescopic section 20 and a third telescopic section 21, and the diameters gradually decrease. The output end of the rotary motor is provided with a screw rod 26, and the end of the screw rod 26 away from the rotary motor extends into the second telescopic section 20 and is threadedly connected. The multi-section telescopic mechanism further comprises a fourth telescopic section 22. The first telescopic section 19, the second telescopic section 20, the third telescopic section 21 and the fourth telescopic section 22 are all provided with cable limiting blocks 25. Pulleys 23 and cables 24 are installed on the second telescopic section 20 and the third telescopic section 21. The cable limiting blocks 25 are fixedly connected with the cables 24. The pulleys 23 are arranged in pairs on the second telescopic section 20 and the third telescopic section 21. The cables 24 are wound on the pulleys 23. A bottom spiral block 28 is formed in the second telescopic section 20, and the screw rod 26 is threadedly connected with the bottom spiral block 28.

[0062] A method for using a tidal flow artificial wetland tail water sediment secondary degradation device, comprising the following steps:

[0063] Step S1: For the sediment secondary recovery system, the sediment scattering system and the intelligent sensing system, install them at the position around the artificial wetland and fix them well.

[0064] Step S2: Connect the time control switch 15, the water level sensor I, the water level sensor II, and connect the sensors with the corresponding rotary motor, stirring motor and mud power pump respectively.

[0065] The time control switch 15 does not connect all circuits in other stages, and the equipment is not working.

[0066] Step S3: when the tide rises, the time control switch 15 controls the single circuit to be connected during the rising tide stage, ensuring that the rotary motor works; the water level sensor 17 is provided with an extension sensing area 29 and a retraction sensing area 30 at the upper and lower parts, respectively; when the tide rises to the extension sensing area 29, the rotary motor 10 is in normal transmission, the multi-section telescopic mechanism is extended, and the scraper is sent back to the tail end plate 3;

[0067] Extension action of the multi-section telescopic mechanism: the rotary motor rotates, the screw rod 26 rotates to push the second telescopic section 20 to move upward through the bottom screw block 28; at the same time, since the cable limiting block 25 of the first telescopic section 19 has been fixed with the cable 24, the limiting stationary pulley rotates to drive the cable limiting block 24 on the third telescopic section 21 to move upward, and the third telescopic section 21 moves upward at the same time; similarly, the fourth telescopic section 22 also moves upward with the third telescopic section 21.

[0068] Step S4: when the tide recedes, the time control switch 15 controls all circuits to be connected through the water level sensor 17 during the receding tide stage; when the water level drops to the retraction sensing area 30 during the receding tide, the rotary motor reverses, the multi-section telescopic mechanism is shortened, and the scraper moves; at this time, the steel ball brush is in front, the deposited substances on the rigid supporting plate are brushed loose, and the deposited substances are pushed to the installation notch plate 35 of the rigid supporting plate by the rear scraper along with the accumulated water;

[0069] The stirring motor 11 is controlled through the water level sensor 2, and the stirring is uniform; and then the mud power pump 13 sends the mud back to the artificial wetland;

[0070] Step S5: the upper and lower parts of the water level sensor 18 are divided into a stirring sensing area 31, a power pneumatic area 32, and a stop area 34;

[0071] When the water level continues to drop to the stirring sensing area 31, the excess lake water has overflowed outwards from the overflow hole 27, the stirring motor 11 starts, and the remaining deposited substances scraped by the scraper are fully stirred;

[0072] Step S6: when the water level continues to drop to the power start area 33, the stirring motor 11 stops, and the mud power pump 13 starts to send the deposited substances in the groove and the mud power pump 13 to the rotary mud spray head 14 through the mud conveying pipe 12; the deposited substances and the lake water mixture are sprayed to the soil layer of the wetland again by the rotary mud spray head 14 for secondary degradation;

[0073] When the water level continues to drop to the stop area 34, no new deposited substances enter the installation notch plate 35, and the stirring motor 11 and the mud power pump 13 both stop.

[0074] Example 2

[0075] As Figure 6As shown, on the basis of the embodiment 1, the outer side of the second telescopic joint 20 is provided with a guide groove 42, the inner side of the first telescopic joint 19 is provided with a guide column 43, the guide column 43 is fixedly connected with the first telescopic joint 19, and the guide column 43 is matched with the guide groove 42; the third telescopic joint 21 is fixedly connected with the end of the second telescopic joint 20, and is located at the end side away from the first telescopic joint 19; the first telescopic joint 19 is provided with a sealing plate 44 at the outer end of the second telescopic joint 20.

[0076] It will be obvious to a person skilled in the art that, without departing from the spirit or essential characteristics of the application, the present application can be implemented in other specific forms. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the specification as a whole, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

[0077] Furthermore, it should be appreciated that although the present specification describes only a few embodiments, each limited to just one independent technical solution, the specification is merely for the sake of clarity and each embodiment can be combined with other embodiments in a manner that a person skilled in the art can understand, to form other embodiments.

Claims

1. A device for secondary degradation of sediments in tailwater of tidal flow constructed wetlands, characterized in that, It includes a secondary sediment recovery system, a sediment distribution system, and an intelligent sensing system; the secondary sediment recovery system is located on the edge of the wetland. The sediment secondary recovery system includes a rigid support (1) and a rotary motor (9). The top of the rigid support (1) is supported by a rigid support plate (2). A tail end plate (3) is fixedly installed on the rigid support plate (2). A support frame (7) is installed on the side of the tail end plate (3). The bottom end of the support frame (7) is fixedly connected to the rigid support plate (2). The rigid support plate (2) is equipped with a multi-section telescopic mechanism (8), and the rotary motor (9) is adapted to drive the multi-section telescopic mechanism (8) to extend and retract. The output end of the multi-section telescopic mechanism (8) is equipped with a scraper (5), which moves on the rigid support plate (2). The rigid support plate (2) is inclined and has a mounting recess plate (35) on the side away from the tail end plate (3), and the bottom of the mounting recess plate (35) abuts against the edge of the wetland. The sediment distribution system includes a stirring motor (11), which is installed in a mounting recess plate (35); a mud conveying device is installed at the bottom of the stirring motor (11) to pump the stirred mud to the surface of the wetland soil layer.

2. The secondary degradation device for tailwater sediments of an artificial wetland according to claim 1, characterized in that, A dense mesh support net (4) is installed on one side of the tail end plate (3) relative to the multi-section telescopic mechanism (8). The dense mesh support net is fixedly installed on the tail end plate (3). A steel wool brush (6) is installed at the bottom of the scraper (5). The steel wool brush (6) is suitable for adhering to the surface of the rigid support plate (2).

3. The secondary degradation device for tailwater sediments of an artificial wetland according to claim 1, characterized in that, The mud conveying component includes a mud conveying pipe (12), a truncated cone frame (36) is installed inside the mounting recess plate (35), and a mud unloading chamber (37) is opened at the bottom. The truncated cone frame (36), the mud unloading chamber (37) and the mounting recess plate (35) are connected. The output end of the stirring motor (11) is upward and a cutting blade (38) is installed inside the truncated cone frame (36); a fixed cylinder (39) is provided in the middle of the mud discharge chamber (37), and the stirring motor (11) is installed inside the fixed cylinder (39). The fixed cylinder (39) is fixedly connected to the truncated cone frame (36), and the bottom of the mud discharge chamber (37) is connected to the mud conveying pipe (12).

4. The secondary degradation device for tailwater sediments of an artificial wetland according to claim 3, characterized in that, The mud conveying device also includes a mud power pump (13) and a rotating mud nozzle (14). The pump body of the mud power pump (13) is equipped with a support platform (40), and the support platform (40) is fixed on the wetland soil layer. The mud conveying pipe (12) passes through the support platform (40), and the top is equipped with a rotating mud nozzle (14). The mud power pump (13) is suitable for pumping the sediment in the mounting recess plate (35) after being stirred by the stirring motor (11), and pumping it to the rotating mud nozzle (14) for spraying.

5. The secondary degradation device for tailwater sediments of an artificial wetland according to claim 4, characterized in that, The mounting notch plate (35) is equipped with a support platform two (41) on the side away from the rigid support plate (2). The support platform two (41) is suitable for being fixed on the wetland soil layer, and a motor support (10) is installed on the top. A rotary motor (9) is fixedly installed on the top of the motor support (10).

6. The secondary degradation device for tailwater sediments of an artificial wetland according to claim 4, characterized in that, The intelligent sensing system includes a time control switch (15), a water level sensor one (17), and a water level sensor two (18). The time control switch (15) is electrically connected to the water level sensor one (17) and the water level sensor two (18) by respectively installing wires. The water level sensor one (17) is installed on the motor support (10), and the water level sensor two (18) is installed at the mounting notch plate (35).

7. The secondary degradation device for tailwater sediments of an artificial wetland according to claim 4, characterized in that, The multi-section telescopic mechanism (8) includes a first-stage telescopic section (19), a second-stage telescopic section (20), and a third-stage telescopic section (21), with the diameter gradually decreasing; the output end of the rotary motor (9) is equipped with a screw (26), and the end of the screw (26) away from the rotary motor (9) extends into the second-stage telescopic section (20) and is threadedly connected.

8. The secondary degradation device for tailwater sediments of an artificial wetland according to claim 7, characterized in that, The multi-section telescopic mechanism (8) also includes a fourth-stage telescopic section (22). Cable limiting blocks (25) are installed in the first-stage telescopic section (19), the second-stage telescopic section (20), the third-stage telescopic section (21), and the fourth-stage telescopic section (22). Pulleys (23) and cables (24) are installed on the second-stage telescopic section (20) and the third-stage telescopic section (21). The cable limiting blocks (25) are fixedly connected to the cables (24). The pulleys (23) are arranged in pairs on the second-stage expansion joint (20) and the third-stage expansion joint (21); a cable (24) is wound on the pulleys (23); A bottom spiral block (28) is provided inside the second-stage expansion joint (20), and the screw (26) is threadedly connected to the bottom spiral block (28).

9. A secondary degradation device for tailwater sediments in an artificial wetland according to claim 8, characterized in that, The second-stage expansion joint (20) is provided with a guide groove (42) on the outside, and the first-stage expansion joint (19) is provided with a guide post (43) inside. The guide post (43) is fixedly connected to the first-stage expansion joint (19), and the guide post (43) is adapted to the guide groove (42). The third-stage expansion joint (21) is fixedly connected to the end of the second-stage expansion joint (20) and is located on the end side away from the first-stage expansion joint (19). The first-stage expansion joint (19) is provided with a sealing plate (44) at the outer end of the second-stage expansion joint (20).

10. A method of using the secondary degradation device for tailwater sediments of an artificial wetland as described in claim 8, characterized in that, Includes the following steps: Step S1: Install and secure the sediment secondary recovery system, sediment distribution system, and intelligent sensing system at the location surrounding the constructed wetland. Step S2: Connect the time control switch (15), water level sensor one, and water level sensor two, and connect the sensors to the corresponding rotary motor, stirring motor, and mud power pump respectively. During other stages, all circuits are not connected when the time switch (15) is in operation; the equipment is stationary and does not work. Step S3: During high tide, the time control switch (15) controls the single circuit to be connected during the high tide stage to ensure the operation of the rotary motor (9); the water level sensor (17) is provided with an extension sensing area (29) and a retraction sensing area (30) at the top and bottom respectively; when the tide rises to the extension sensing area (29), the rotary motor (9) rotates forward, the multi-section telescopic mechanism (8) extends, and the scraper is sent back to the tail end plate (3); The extension action of the multi-section telescopic mechanism (8): The rotary motor (9) rotates, and the screw (26) rotates to push the second-stage telescopic section (20) upward through the bottom spiral block (28); at the same time, since the cable limiting block (25) of the first-stage telescopic section (19) is fixed with the cable (24), the limiting pulley rotates, which drives the cable limiting block (25) on the third-stage telescopic section (21) to move upward, and the third-stage telescopic section (21) moves upward at the same time; similarly, the fourth-stage telescopic section (22) also moves upward with the third-stage telescopic section (21); Step S4: During low tide, the time control switch (15) controls all circuits to be connected through the water level sensor (17) during the low tide stage; when the water level drops to the retraction sensing area (30) during low tide, the rotary motor (9) reverses, the multi-section telescopic mechanism (8) shortens, and the scraper (5) moves; at this time, the steel wool brush (6) is in front, which scrapes and loosens the sediment on the rigid support plate (2), and the rear scraper (5) pushes the sediment along with the accumulated water to the mounting notch plate (35) of the rigid support plate (2); The water level sensor (18) controls the stirring motor (11) to stir evenly; then the mud is pumped back into the artificial wetland by the mud power pump (13). Step S5: The upper and lower parts of the water level sensor (18) are divided into a stirring sensing area (31), a power pneumatic area (32), and a stop area (34). As the water level continues to drop to the stirring induction zone (31), excess lake water overflows from the overflow hole (27), the stirring motor (11) starts, and the remaining sediment scraped by the scraper (5) is fully stirred. Step S6: The water level continues to drop to the power start zone (33). At this time, the stirring motor (11) stops, and the mud power pump (13) starts to send the sediment in the groove and the mud power pump (13) to the rotating mud nozzle (14) through the mud delivery pipe (12). The rotating mud nozzle (14) sprays the sediment and lake water mixture back onto the wetland soil layer for secondary degradation. The water level continued to drop to the stop zone (34), and no new sediment entered the notch plate (35). The stirring motor (11) and the mud pump (13) both stopped.

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