Garden drainage system for sponge city

Abstract

The invention relates to the technical field of urban drainage, and discloses a garden drainage system for a sponge city, which comprises an earth surface permeable layer, an underground permeable layer and a water collecting pipe which are arranged from top to bottom, one end of the water collecting pipe is communicated with a water storage tank pre-buried underground, the top of the water collecting pipe is provided with a water inlet, and a filter screen is arranged in the water inlet; a connecting shaft is rotationally mounted in the water collecting pipe, and a plurality of connecting rods are fixedly mounted on the connecting shaft; the adjusting assembly based on the characteristics of the thermal expansion column is arranged, the connecting shaft is driven to rotate through telescopic power generated by the thermal expansion column along with the change of the environment temperature, then the cleaning rod is driven to clean the inner wall of the lower half part of the water collecting pipe, and the cleaning operation can be automatically executed according to natural fluctuation of the underground temperature through the design; and the defect of high cost caused by deep burying of the water collecting pipe in a traditional manual cleaning mode is effectively avoided, and the problem that the water collecting pipe is difficult to maintain is fundamentally solved.

Description

Technical Field

[0001] The invention relates to the technical field of urban drainage, in particular to a garden drainage system for a sponge city. Background Art

[0002] Sponge city refers to an urban development mode that effectively controls rainwater runoff by strengthening urban planning and construction management, giving full play to the absorption, storage and slow release of rainwater by buildings, roads, green spaces, water systems and other ecosystems, and achieving natural accumulation, natural infiltration and natural purification. Sponge city can absorb water, store water, infiltrate water and purify water when it rains, and "release" and utilize the stored water when needed. It has good "elasticity" like a sponge, which helps solve problems such as urban waterlogging and rainwater runoff pollution. At the same time, it can save water resources, improve the function of urban ecosystems and reduce interference with the natural ecological environment.

[0003] Chinese patent CN213682032U discloses a drainage structure, including a water injection pump and a water injection pipe; the lower end of the water injection pipe extends downward to the permeable layer area below the ground surface; one end of the water injection pump is connected to the accumulated water or stored water on the ground, and the other end is connected to the water injection pipe, which is used to inject water into the permeable layer area through the water injection pipe. The scheme also provides a sponge city water storage and drainage system, including the drainage structure as described above. The drainage structure and sponge city water storage and drainage system using the above technical scheme can inject the accumulated water or stored water into the underground permeable layer through the water injection pipe through the water injection pump. Since the permeable layer has a strong water permeability, it helps to quickly discharge the accumulated water or stored water; in addition, rainwater is pollution-free, and after being injected into the permeable layer, it can supplement groundwater and help solve the problem of ground subsidence.

[0004] As shown in the above patent, the current common sponge city drainage system is mostly to set up permeable layers on the ground and underground to allow rainwater to naturally penetrate into the ground, and then use the water collection pipe to collect the rainwater that penetrates deep into the ground and transport it to the water storage area. When there is a demand for water, water is pumped from the water storage area for use. However, this traditional method has obvious disadvantages. The water collection pipe is usually buried deep underground, and the purity of the rainwater that penetrates into the ground is relatively low. The water collection pipe is very easy to form scale during long-term use, and even cause blockage in severe cases. In addition, since the water collection pipe is buried deep underground, once a problem occurs, the cleaning work is extremely difficult and requires a lot of manpower, material resources and time costs.

[0005] Therefore, it is necessary to provide a garden drainage system for sponge cities to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide a garden drainage system for sponge cities, which can automatically perform cleaning operations according to the natural fluctuations of underground temperature, accurately target areas prone to scaling and clogging, and effectively avoid the high cost disadvantage of traditional manual cleaning methods caused by deep burial of water collection pipes.

[0007] The above technical objectives of the present invention are achieved through the following technical solutions: a garden drainage system for sponge cities, comprising a surface permeable layer, an underground permeable layer and a water collecting pipe arranged from top to bottom, one end of the water collecting pipe is connected to a water storage tank pre-buried underground, a water inlet is opened on the top of the water collecting pipe, a filter is arranged in the water inlet, a connecting shaft is rotatably installed inside the water collecting pipe, a plurality of connecting rods are fixedly installed on the connecting shaft, a cleaning rod is fixedly installed on one end of the connecting rod away from the connecting shaft, the cleaning rod is in contact with the inner circumferential wall of the water collecting pipe, an adjusting component for driving the connecting shaft to rotate is arranged on the water collecting pipe, the adjusting component comprises a support tube and a thermal expansion column arranged inside the support tube, and the adjusting component drives the connecting shaft to rotate through the power of the thermal expansion column to extend and retract.

[0008] The present invention is further configured as follows: the adjustment assembly also includes a slider slidably installed in the support tube and a driving rod fixedly connected to the bottom wall of the slider, the bottom end of the thermal expansion column is fixedly connected to the slider, the driving rod passes through the bottom wall of the support tube, and the driving rod slides in cooperation with the support tube.

[0009] The present invention is further configured as follows: a top cover is threadedly installed on the top end of the support tube, a connecting bolt is penetrated through the top of the support tube, and the connecting bolt is threadedly connected to the support tube, and the connecting bolt penetrates the top of the thermal expansion column.

[0010] The present invention is further configured as follows: a gear is fixedly mounted on the end of the connecting shaft, a first connecting plate is fixedly mounted on the bottom end of the driving rod, and a rack meshing with the gear is fixedly connected to the bottom end of the first connecting plate.

[0011] The present invention is further configured as follows: a support frame is provided inside the water collecting pipe, a mounting seat is fixedly installed on the top of the support frame, a plurality of cleaning needles are fixedly installed on the top of the mounting seat, a plurality of rectangular mesh holes are provided on the filter screen, the top ends of the cleaning needles extend into the rectangular mesh holes, and a transmission component for driving the cleaning needles to move in a wavy trajectory in a horizontal plane is provided in the water collecting pipe.

[0012] The present invention is further configured as follows: the transmission assembly includes an adjustment plate fixedly arranged in the middle of the support frame, an inclined plate for driving the adjustment plate to move longitudinally, and a corrugated plate for driving the adjustment plate to move transversely, the adjustment plate is provided with a transverse through groove and a longitudinal through groove, the inclined plate passes through the transverse through groove, the corrugated plate passes through the longitudinal through groove, the width of the transverse through groove is greater than the width of the inclined plate, and the width of the longitudinal through groove is greater than the width of the corrugated plate.

[0013] The present invention is further configured as follows: a second connecting plate is fixedly mounted on the side wall of the first connecting plate, and the bottom ends of the inclined plate and the corrugated plate are fixedly connected to the second connecting plate.

[0014] The present invention is further configured as follows: two first rollers are rotatably installed in the transverse through groove, and both of the two first rollers are in contact with the inclined plate; two second rollers are rotatably installed in the longitudinal through groove, and both of the two second rollers are in contact with the corrugated plate.

[0015] The present invention is further configured as follows: support seats are fixedly installed on the four corners of the support frame, a rectangular through groove is opened on the inner side of the support seat, a connecting column is arranged in the rectangular through groove, the top end of the connecting column is fixedly connected to the inner wall of the water collecting pipe, two limit plates are fixedly installed on the connecting column, the top wall and bottom wall of the support seat are respectively fitted with the two limit plates, and the support seat and the limit plates are slidably matched.

[0016] The present invention is further configured as follows: a water inlet is provided at the top of the water storage tank, and an overflow port is provided at the top of the water storage tank wall.

[0017] In summary, the present invention has the following beneficial effects: 1. The present invention sets an adjustment component based on the characteristics of the thermal expansion column, utilizes the telescopic power generated by the thermal expansion column as the ambient temperature changes, drives the connecting shaft to rotate, and then drives the cleaning rod to clean the inner wall of the lower half of the water collecting pipe. This design can automatically perform cleaning operations according to the natural fluctuations of underground temperature, accurately targets areas prone to scaling and clogging, and effectively avoids the high cost disadvantage of traditional manual cleaning methods caused by the deep burial of the water collecting pipe, thereby solving the problem of difficult maintenance of the water collecting pipe from the root.

[0018] 2. The present invention constructs a transmission assembly composed of an inclined plate, a corrugated plate, etc. The transmission assembly uses the power of the driving rod to move up and down to prompt the adjustment plate to drive the cleaning needle to move in a wavy trajectory on the filter. Compared with the traditional cleaning method, this design significantly expands the activity range of the cleaning needle, greatly improves the cleaning effect of the filter dirt, and effectively solves the problem of the traditional cleaning method that the filter is easily blocked due to the limited cleaning range, affecting the drainage efficiency, and effectively guarantees the long-term stable operation of the drainage system, ensuring the efficiency and reliability of the entire sponge city drainage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the water collecting pipe and the regulating assembly of the present invention; Figure 3 for Figure 2 A schematic diagram of the enlarged structure at point A; Figure 4 It is a schematic cross-sectional structural diagram of the water collecting pipe of the present invention; Figure 5 for Figure 4 A schematic diagram of the enlarged structure at B; Figure 6 It is a schematic diagram of the structure of the support frame and the cleaning needle of the present invention; Figure 7 for Figure 6 A schematic diagram of the enlarged structure at C; Figure 8 It is a structural schematic diagram of the regulating assembly of the present invention; Fig. 9 It is a schematic diagram of the structure of the inclined plate, the corrugated plate and the second connecting plate of the present invention; Fig.10 It is a structural schematic diagram of the cleaning rod, the connecting shaft and the gear of the present invention; Fig.11 It is a schematic structural diagram of the support seat, the adjustment plate and the connecting column of the present invention.

[0020] In the figure: 1, surface permeable layer; 2, underground permeable layer; 3, water collecting pipe; 301, water inlet; 4, water storage tank; 401, water intake; 402, overflow; 5, adjustment component; 501, support cylinder; 502, slider; 503, drive rod; 504, thermal expansion column; 505, connecting bolt; 506, top cover; 6, connecting seat; 7, connecting shaft; 8, gear; 9, connecting rod; 10, cleaning rod ; 11. first connecting plate; 12. rack; 13. filter screen; 14. cleaning needle; 15. support frame; 16. mounting seat; 17. connecting column; 18. limit plate; 19. supporting seat; 1901. rectangular through groove; 20. adjusting plate; 2001. transverse through groove; 2002. longitudinal through groove; 21. first roller; 22. second roller; 23. second connecting plate; 24. inclined plate; 25. corrugated plate. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] See also Figures 1 to 10In an embodiment of the present invention, a garden drainage system for a sponge city includes a surface permeable layer 1, an underground permeable layer 2 and a water collection pipe 3 arranged from top to bottom. The surface permeable layer 1 is a permeable brick, a grass brick, a permeable concrete floor, etc., and its porosity is ≥20%, which can quickly penetrate small and medium rainfall precipitation. These materials have good water permeability, which can allow rainwater to quickly infiltrate, effectively alleviating the problem of surface water accumulation. The underground permeable layer 2 is permeable concrete, and is provided with crushed stone, geotextile, etc. for filtering. One end of the water collection pipe 3 is connected to a water storage tank 4 pre-buried underground. The volume of the water storage tank 4 is designed according to the catchment area, and a water purification module can be arranged therein. A water inlet 301 is opened at the top of the water collection pipe 3, and a filter screen 13 is arranged in the water inlet 301. The pore size of the filter screen 13 is 3mm×3mm. A connecting shaft 7 is rotatably installed inside the water collection pipe 3. The connecting shaft 7 is located at the axis of the water collection pipe 3. A connecting seat 6 is fixedly installed on the inner wall of the tube 3, and a connecting shaft 7 passes through the connecting seat 6, and the connecting shaft 7 is rotatably connected to the connecting seat 6, so as to realize the installation of the connecting shaft 7, and a plurality of connecting rods 9 are fixedly installed on the connecting shaft 7, and a cleaning rod 10 is fixedly installed on the end of the connecting rod 9 away from the connecting shaft 7, and the cleaning rod 10 contacts the inner peripheral wall of the water collecting pipe 3, and three cleaning rods 10 are provided, and the heights of the three cleaning rods 10 are all lower than the height of the axis center line of the water collecting pipe 3, and the angle between two adjacent connecting rods 9 is 30° to 55°. An adjusting component 5 for driving the connecting shaft 7 to rotate is provided on the water collecting pipe 3, and the adjusting component 5 includes a supporting tube 501 and a thermal expansion column 504 arranged inside the supporting tube 501, and the thermal expansion column 504 is made of thermal expansion material, and the thermal expansion column 504 is extended after heating and contracted after cooling, and the adjusting component 5 drives the connecting shaft 7 to rotate through the power of the thermal expansion column 504 to expand and contract;During rainfall, rainwater penetrates into the underground permeable layer 2 through the surface permeable layer 1, then enters the water collecting pipe 3 through the water inlet 301 opened on the water collecting pipe 3, and then is discharged into the water storage tank 4 for collection. Before installation, the local underground temperature is monitored to detect the fluctuation range of the underground temperature. By equipping the thermal expansion column 504 with a suitable length, the rotation range of the connecting shaft 7 is between -60° and 60°, so that the cleaning rod 10 can clean the inner wall of the lower half of the water collecting pipe 3 when it rotates. It should be noted that the probability of the inner wall of the upper half of the water collecting pipe 3 contacting rainwater is relatively low during use, so it is generally not necessary to clean it. During use As the temperature changes, the thermal expansion column 504 expands and contracts, thereby causing the connecting shaft 7 to rotate. When the connecting shaft 7 rotates, the cleaning rod 10 is driven to rotate through the connecting rod 9, thereby cleaning the inner wall of the water collecting pipe 3. When the underground temperature changes, the cleaning rod 10 can be automatically driven to move to clean the water collecting pipe 3. The natural factor of ambient temperature change is cleverly utilized. Without additional energy input, the automatic rotation and cleaning of the cleaning rod 10 can be achieved, which is energy-saving and environmentally friendly, and reduces the maintenance cost of the system. There is no need for manual cleaning, and there is no need to use an electrical drive structure for cleaning, which reduces production upgrade costs and use costs. ;

[0023] In this embodiment, preferably, the adjustment component 5 also includes a slider 502 slidably installed in the support tube 501 and a driving rod 503 fixedly connected to the bottom wall of the slider 502, the bottom end of the thermal expansion column 504 is fixedly connected to the slider 502, the driving rod 503 penetrates the bottom wall of the support tube 501, and the driving rod 503 and the support tube 501 slide in cooperation, ensuring that the expansion and contraction of the thermal expansion column 504 can be accurately transmitted to the driving rod 503, driving the driving rod 503 to move up and down stably; the top end of the support tube 501 is threadedly installed with a top cover 506, and the top of the support tube 501 penetrates A connecting bolt 505 is provided, and the connecting bolt 505 is threadedly connected to the support tube 501. The connecting bolt 505 passes through the top of the thermal expansion column 504. After opening the top cover 506, the connecting bolt 505 can be unscrewed, and the thermal expansion column 504 can be manually pushed up and down to actively drive the cleaning rod 10 to rotate and clean the water collecting pipe 3; when the external ambient temperature rises, the thermal expansion column 504 extends, thereby driving the driving rod 503 to move downward through the slider 502, and when the external ambient temperature drops, the thermal expansion column 504 contracts, thereby driving the driving rod 503 to move upward through the slider 502.

[0024] In this embodiment, preferably, a gear 8 is fixedly mounted on the end of the connecting shaft 7, a first connecting plate 11 is fixedly mounted on the bottom end of the driving rod 503, and a rack 12 meshing with the gear 8 is fixedly connected to the bottom end of the first connecting plate 11; when the driving rod 503 moves up and down, it can move up and down through the first connecting plate 11, thereby driving the gear 8 to rotate, and then driving the multiple connecting rods 9 to rotate through the connecting shaft 7, so that the cleaning rod 10 rotates along the inner wall of the water collecting pipe 3 to clean the inner wall of the water collecting pipe 3.

[0025] In this embodiment, preferably, a water intake 401 is provided at the top of the water storage tank 4, and an overflow port 402 is provided on the top of the wall of the water storage tank 4. The overflow port 402 is connected to a drainage channel, a river channel, etc. The overflow port 402 is provided to prevent the water storage tank 4 from being damaged due to excessively high water levels in extreme weather such as heavy rain, thereby ensuring the safe operation of the water storage tank 4. At the same time, the excess rainwater is discharged into the drainage channel or the river channel, which can also maintain the balance of the entire urban water system. The water intake 401 facilitates the later reuse of the stored rainwater, such as for garden irrigation, road washing, etc., thereby improving the utilization efficiency of water resources and conforming to the concept of recycling water resources in sponge cities.

[0026] See also Figure 2 to Figure 11 In the embodiment of the present invention, a support frame 15 is provided inside the water collecting pipe 3, and a mounting seat 16 is fixedly installed on the top of the support frame 15. The cross-section of the mounting seat 16 is a triangular structure, so that rainwater dripping on the mounting seat 16 can quickly flow downward along the inclined surface of the mounting seat 16, and a plurality of cleaning needles 14 are fixedly installed on the top of the mounting seat 16. A plurality of rectangular mesh holes are provided on the filter screen 13, and the top of the cleaning needle 14 extends into the rectangular mesh hole. A transmission component for driving the cleaning needle 14 to move in a wavy line trajectory in a horizontal plane is provided in the water collecting pipe 3.

[0027] In this embodiment, preferably, the transmission assembly includes an adjustment plate 20 fixedly arranged in the middle of the support frame 15, an inclined plate 24 for driving the adjustment plate 20 to move longitudinally, and a corrugated plate 25 for driving the adjustment plate 20 to move transversely. The adjustment plate 20 is provided with a transverse through groove 2001 and a longitudinal through groove 2002. The inclined plate 24 passes through the transverse through groove 2001, and the corrugated plate 25 passes through the longitudinal through groove 2002. The width of the transverse through groove 2001 is greater than the width of the inclined plate 24, and the width of the longitudinal through groove 2002 is greater than the width of the corrugated plate 25, so that when the adjustment plate 20 moves transversely, the inclined plate 24 will not cause interference, and when the adjustment plate 20 moves longitudinally, The corrugated plate 25 will not cause interference. The wavy structure of the corrugated plate 25 enables the adjustment plate 20 to move in a wavy trajectory on the horizontal plane under the coordinated action of the inclined plate 24 and the corrugated plate 25, providing a power basis for the efficient cleaning of the cleaning needle 14; the second connecting plate 23 is fixedly installed on the side wall of the first connecting plate 11, and the bottom ends of the inclined plate 24 and the corrugated plate 25 are fixedly connected to the second connecting plate 23; two first rollers 21 are rotatably installed in the transverse through groove 2001, and the two first rollers 21 are in contact with the inclined plate 24; two second rollers 22 are rotatably installed in the longitudinal through groove 2002, and the two second rollers 22 are in contact with the corrugated plate 25 The arrangement of the first roller 21 and the second roller 22 can, on the one hand, reduce the friction force of the inclined plate 24 and the corrugated plate 25 when they move, making their movement smoother, and on the other hand, ensure the stability of the inclined plate 24 and the corrugated plate 25 during the movement, thereby ensuring the accuracy of the movement of the adjustment plate 20; when the driving rod 503 drives the first connecting plate 11 to move up and down, the first connecting plate 11 drives the inclined plate 24 and the corrugated plate 25 to move up and down through the second connecting plate 23, and the inclined plate 24 drives the adjustment plate 20 to move longitudinally when it moves up and down, and the corrugated plate 25 drives the adjustment plate 20 to move back and forth horizontally when it moves up and down, so that the adjustment plate 20 moves in a wave-shaped trajectory in the horizontal plane, thereby The support frame 15 drives the cleaning needle 14 to move in a wave-shaped trajectory in the rectangular mesh through the mounting seat 16, thereby effectively cleaning the filter 13. Compared with the traditional cleaning method of moving the cleaning needle 14 up and down, the cleaning needle 14 has a larger range of movement in the rectangular mesh, which can significantly improve the cleaning effect and prevent dirt in the water from adhering to the filter 13 and causing blockage, thereby greatly improving the cleaning efficiency and quality of the filter 13, extending the service life of the filter 13, and ensuring the long-term stable operation of the drainage system. The movement of the cleaning needle 14 is also driven by the power of the expansion column 504, without the need for other driving sources, thereby reducing production costs and use costs.

[0028] In this embodiment, preferably, support seats 19 are fixedly installed on the four corners of the support frame 15, and a rectangular through groove 1901 is opened on the inner side of the support seat 19. A connecting column 17 is arranged in the rectangular through groove 1901, and the top end of the connecting column 17 is fixedly connected to the inner wall of the water collecting pipe 3, and two limit plates 18 are fixedly installed on the connecting column 17. The top wall and the bottom wall of the support seat 19 are respectively fitted with the two limit plates 18, and the support seat 19 and the limit plates 18 are slidably matched; the support frame 15 is supported by the support seat 19 and the limit plates 18, and the setting of the rectangular through groove 1901 enables the support frame 15 to move slightly on the horizontal plane, which not only ensures that the support frame 15 can move slightly on the horizontal plane to adapt to the wave-like movement of the adjustment plate 20, but also limits the range of movement of the support frame 15 by the limit plates 18 to ensure the stability and reliability of the structural operation.

[0029] Working principle: During use, as the temperature changes, the thermal expansion column 504 expands and contracts. When the external environment temperature rises, the thermal expansion column 504 extends, thereby driving the driving rod 503 to move downward through the slider 502. When the external environment temperature drops, the thermal expansion column 504 contracts, thereby driving the driving rod 503 to move upward through the slider 502. When the driving rod 503 moves up and down, it can move up and down through the first connecting plate 11, thereby driving the gear 8 to rotate, and then driving the multiple connecting rods 9 to rotate through the connecting shaft 7, so that the cleaning rod 10 rotates along the inner wall of the water collecting pipe 3 to clean the inner wall of the water collecting pipe 3; Furthermore, when the driving rod 503 drives the first connecting plate 11 to move up and down, the first connecting plate 11 drives the inclined plate 24 and the corrugated plate 25 to move up and down through the second connecting plate 23. When the inclined plate 24 moves up and down, it drives the adjusting plate 20 to move longitudinally. When the corrugated plate 25 moves up and down, it drives the adjusting plate 20 to move back and forth laterally, so that the adjusting plate 20 moves in a wavy trajectory in the horizontal plane, and then the support frame 15 drives the cleaning needle 14 to move in a wavy trajectory in the rectangular mesh through the mounting seat 16, thereby effectively cleaning the filter 13. Compared with the traditional cleaning method of moving the cleaning needle 14 up and down, the cleaning needle 14 has a larger range of movement in the rectangular mesh, which can significantly improve the cleaning effect and prevent dirt in the water from adhering to the filter 13 and causing blockage.

[0030] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A garden drainage system for a sponge city, comprising a surface permeable layer, an underground permeable layer and a water collecting pipe arranged from top to bottom, one end of the water collecting pipe is connected to a water storage tank pre-buried underground, characterized in that: A water inlet is provided on the top of the water collecting pipe, a filter is arranged in the water inlet, a connecting shaft is rotatably installed inside the water collecting pipe, a plurality of connecting rods are fixedly installed on the connecting shaft, a cleaning rod is fixedly installed on one end of the connecting rod away from the connecting shaft, the cleaning rod is in contact with the inner circumferential wall of the water collecting pipe, an adjusting component for driving the connecting shaft to rotate is arranged on the water collecting pipe, the adjusting component includes a supporting tube and a thermal expansion column arranged inside the supporting tube, and the adjusting component drives the connecting shaft to rotate through the power of the expansion and contraction of the thermal expansion column.

2. A garden drainage system for a sponge city according to claim 1, characterized in that: The adjustment assembly also includes a slider slidably installed in the support tube and a driving rod fixedly connected to the bottom wall of the slider. The bottom end of the thermal expansion column is fixedly connected to the slider, the driving rod penetrates the bottom wall of the support tube, and the driving rod slides in cooperation with the support tube.

3. A garden drainage system for a sponge city according to claim 2, characterized in that: The top end of the support tube is threadedly installed with a top cover, the top of the support tube is penetrated by a connecting bolt, and the connecting bolt is threadedly connected to the support tube, and the connecting bolt penetrates the top of the thermal expansion column.

4. A garden drainage system for a sponge city according to claim 2, characterized in that: The end of the connecting shaft is fixedly sleeved with a gear, the bottom end of the driving rod is fixedly mounted with a first connecting plate, and the bottom end of the first connecting plate is fixedly connected with a rack meshing with the gear.

5. A garden drainage system for a sponge city according to claim 4, characterized in that: A support frame is provided inside the water collecting pipe, a mounting seat is fixedly installed on the top of the support frame, a plurality of cleaning needles are fixedly installed on the top of the mounting seat, a plurality of rectangular mesh holes are provided on the filter screen, the top ends of the cleaning needles extend into the rectangular mesh holes, and a transmission component for driving the cleaning needles to move in a wavy trajectory in a horizontal plane is provided in the water collecting pipe.

6. A garden drainage system for a sponge city according to claim 5, characterized in that: The transmission assembly includes an adjustment plate fixedly arranged in the middle of the support frame, an inclined plate for driving the adjustment plate to move longitudinally, and a corrugated plate for driving the adjustment plate to move transversely. The adjustment plate is provided with a transverse through groove and a longitudinal through groove. The inclined plate passes through the transverse through groove, and the corrugated plate passes through the longitudinal through groove. The width of the transverse through groove is greater than the width of the inclined plate, and the width of the longitudinal through groove is greater than the width of the corrugated plate.

7. A garden drainage system for a sponge city according to claim 6, characterized in that: A second connecting plate is fixedly mounted on the side wall of the first connecting plate, and the bottom ends of the inclined plate and the corrugated plate are fixedly connected to the second connecting plate.

8. The garden drainage system for sponge city according to claim 7 is characterized by: Two first rollers are rotatably installed in the transverse through groove, and both of the two first rollers are in contact with the inclined plate. Two second rollers are rotatably installed in the longitudinal through groove, and both of the two second rollers are in contact with the corrugated plate.

9. The garden drainage system for sponge city according to claim 5, characterized in that: A support seat is fixedly installed on the four corners of the support frame, a rectangular through groove is opened on the inner side of the support seat, a connecting column is arranged in the rectangular through groove, the top end of the connecting column is fixedly connected to the inner wall of the water collecting pipe, two limit plates are fixedly installed on the connecting column, the top wall and bottom wall of the support seat are respectively fitted with the two limit plates, and the support seat and the limit plates are slidably matched.

10. The garden drainage system for sponge city according to claim 1, characterized in that: The top of the water storage tank is connected to a water intake port, and the top of the water storage tank wall is provided with an overflow port.

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