Sponge city rainwater collecting, purifying and recycling system and method

Abstract

The invention relates to a sponge city rainwater collecting, purifying and recycling system and method, and relates to the technical field of sponge city construction.The system comprises a mounting frame fixedly arranged at a road surface drainage opening, a drainage cover plate is arranged in the mounting frame, and a rainwater purifying assembly is arranged below the drainage cover plate; the rainwater purification assembly is composed of a plurality of purification units arranged side by side, and a conveying assembly used for overturning the purification units to the position above the drainage cover plate for maintenance is further arranged in the installation frame. According to the system, the rotatable filter screen plate, the catalyst module, the purifying agent module and the activated carbon module are arranged, multiple purification measures are used for cooperative treatment, rainwater can be efficiently purified, a deflection structure provides power for an extrusion mechanism, the complexity of a water flow passing path is increased, the purification efficiency is improved, pollutant deposition can be prevented through vibration, and the rainwater purification effect is improved. The assembly service life is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of sponge city construction, and specifically relates to a system and method for collecting, purifying and reusing rainwater in a sponge city. Background Art

[0002] In recent years, in order to cope with the problems of urban water shortage and waterlogging, the concept of sponge city construction has emerged. Sponge city emphasizes strengthening urban planning and construction management, giving full play to the absorption, storage and slow release of rainwater by ecological systems such as buildings, roads, green spaces and water systems, effectively controlling rainwater runoff, and realizing the urban development mode of natural accumulation, natural infiltration and natural purification.

[0003] In traditional rainwater treatment methods, rainwater is usually discharged directly into water bodies around cities through drainage pipe networks. This method not only fails to effectively utilize precious rainwater resources, but also may pollute the receiving water bodies due to the large amount of pollutants carried by the initial rainwater, such as road dust, oil, garbage, etc.

[0004] At present, the purification components of the existing sponge city rainwater collection, purification and reuse systems are usually fixed and installed, which is difficult to carry out convenient maintenance and upkeep. During long-term use, the purification components will reduce their purification performance due to problems such as intercepting a large amount of impurities and the growth of microorganisms. However, due to the unreasonable structural design, the operation of cleaning and replacing the purification components is cumbersome. The purification process of the existing system is not perfect, and generally a single filtration or precipitation method is adopted, which is difficult to effectively remove tiny particles, soluble pollutants and organic matter in the water, resulting in the purified water quality being difficult to meet diverse water needs. In addition, the safety of the existing system is insufficient. Under heavy rain conditions, traditional rainwater discharge facilities usually cannot provide sufficient warning signs. Pedestrians or vehicles may accidentally enter the drainage area due to poor visibility, causing safety hazards.

[0005] To this end, we provide a sponge city rainwater collection, purification and reuse system and method to solve the above-mentioned problems. Summary of the invention

[0006] The purpose of the present invention is to provide a system and method for collecting, purifying and reusing rainwater in a sponge city in response to the problems of the background technology.

[0007] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0008] A sponge city rainwater collection, purification and reuse system, including an installation frame fixedly arranged at the road surface drain outlet, a drainage cover plate is arranged in the installation frame, a rainwater purification component is arranged below the drainage cover plate, the rainwater purification component is composed of a plurality of purification units arranged side by side, and a conveying component for turning the purification unit above the drainage cover plate for maintenance is also arranged in the installation frame. The conveying component includes a conveyor belt, a driving member for driving the conveyor belt to rotate, and a track fixed on the inner wall of the installation frame and matching with the conveyor belt. Activity doors for the purification unit to pass through are arranged in the installation frame at both ends of the drainage cover plate.

[0009] As a further optimized solution of the present invention, the purification unit includes two symmetrically distributed vertical plates. A filter screen plate, a catalyst module, a purifying agent module and an activated carbon module are sequentially rotatably arranged between the two vertical plates from top to bottom. Side frame bodies are arranged on both sides of the two vertical plates, and piezoelectric films and ultraviolet lamps are integrated in the side frame bodies; A plurality of groups of extrusion mechanisms are arranged on both sides of the bottom of the filter screen plate, the catalyst module, the purifying agent module and the activated carbon module. The extrusion mechanism is used to apply pressure to the piezoelectric film based on the rotation of the filter screen plate, the catalyst module, the purifying agent module and the activated carbon module to generate a piezoelectric effect to purify rainwater.

[0010] As a further optimized solution of the present invention, a rubber pad is fixedly arranged on the outer side of the side frame body, and adjacent two purification units are abutted against each other through the rubber pad.

[0011] As a further optimized solution of the present invention, rotating shafts rotatably connected to the vertical plates are arranged in the middle of the filter screen plate, the catalyst module, the purifying agent module and the activated carbon module; Flexible seals are arranged between the filter screen plate, the catalyst module, the purifying agent module and the activated carbon module and the inner wall of the side frame body.

[0012] As a further optimized solution of the present invention, the extrusion mechanism includes a fixed plate fixed in the side frame body and a connecting rod rotatably arranged at the bottom of the filter screen plate, the catalyst module, the purifying agent module or the activated carbon module; An extrusion rod is movably penetrated through the fixed plate. One end of the extrusion rod is provided with a ball head structure abutting against the piezoelectric film, and the other end is rotatably connected to the end of the connecting rod. A first spring for resetting is sleeved on the extrusion rod.

[0013] As a further optimized solution of the present invention, a driving mechanism for driving the filter screen plate, the catalyst module, the purifying agent module and the activated carbon module to reciprocate and deflect is provided on the outer side of one of the vertical plates; the driving mechanism includes a driving frame slidably arranged on the vertical plate, and a plurality of racks are staggered on both sides of the inner wall of the driving frame, and gears meshing with the racks are fixedly arranged at the ends of the rotating shafts of the filter screen plate, the catalyst module, the purifying agent module and the activated carbon module; a cam and a motor for driving the cam to rotate are arranged above the driving frame, a movable rod is fixedly arranged at the bottom of the driving frame, a fixed seat for the movable rod to penetrate through is fixedly arranged on the vertical plate, and a second spring for resetting is sleeved on the movable rod.

[0014] As a further optimized solution of the present invention, a lifting assembly for lifting to mark the range of the drainage cover plate is further provided on the installation frame; the lifting assembly includes two inclined support units symmetrically distributed on both sides of the drainage cover plate, a lifting frame and a lifting mechanism for driving the lifting frame to lift. The inclined support unit includes an inclined support plate and a telescopic rod located inside the inclined support plate. One end of the inclined support plate is rotatably connected to the installation frame, and the other end is rotatably connected to the end face of the upper cross beam of the lifting frame through the telescopic rod. A folding frame is arranged in the inner groove of the inclined support plate, and the folding frames of the two inclined support units are buckled with each other.

[0015] As a further optimized solution of the present invention, water storage tanks for storing the purified rainwater are fixedly arranged at the bottom corners of the installation frame; an adjusting plate and a connecting seat are arranged on one side of the upper cross beam of the lifting frame. The connecting seat is rotatably connected to the cross beam, and the adjusting plate is rotatably connected to the connecting seat; a water spraying unit for reusing rainwater is integrated on the adjusting plate. The water spraying unit includes a water spraying pipe and a water pump. A plurality of spray holes are arranged at equal intervals on the water spraying pipe, and the water pump is used for pumping the rainwater in the water storage tank into the water spraying pipe.

[0016] The present invention also provides a method for collecting, purifying and reusing rainwater in a sponge city, including the following steps:

[0017] S1. Rainwater enters the rainwater purification assembly through the drainage cover plate, and the rainwater purification assembly gradually purifies the rainwater to remove various pollutants in the rainwater;

[0018] Among them, when the rainwater purification assembly needs to be cleaned and maintained, the driving part of the conveying assembly is started, and the driving part drives the conveyor belt to run on the track. The rainwater purification assembly connected to the conveyor belt gradually moves above the drainage cover plate as the conveyor belt runs. During the movement of the rainwater purification assembly, it passes through the movable doors at both ends of the drainage cover plate until it is completely turned over above the drainage cover plate for cleaning and maintenance;

[0019] S2. The purified rainwater is transported to the water storage facilities in the city through pipelines to provide water sources for subsequent reuse.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention can transport the rainwater purification component to the top of the drainage cover plate for exposure to the sun for odor removal, maintenance or replacement by providing a conveying component, which not only improves the maintenance efficiency but also extends the service life of the rainwater purification component. By providing a rotatable filter plate, a catalyst module, a purifier module and an activated carbon module, a variety of purification measures are coordinated to efficiently purify rainwater. The deflection structure not only provides power for the extrusion mechanism, but also increases the complexity of the water flow path, thereby improving the purification efficiency. It can also prevent the deposition of pollutants through vibration, thereby extending the service life of the component.

[0022] 2. The present invention arranges a piezoelectric film, an ultraviolet lamp and an extrusion mechanism to assist in purifying rainwater through the piezoelectric effect, decompose some organic pollutants, and further improve the rainwater purification effect. The catalyst module under the irradiation of the ultraviolet lamp can accelerate the chemical reaction, effectively degrade harmful substances in the water, and enhance the overall purification capacity.

[0023] 3. The present invention, by setting a lifting component, can not only mark the range of the drainage cover in heavy rain weather to ensure the safety of pedestrians and vehicles, but also can combine with the water spray unit to realize the reuse of purified rainwater and improve the utilization rate of water resources. The whole system has a compact structure, convenient operation, and good practicality and maintainability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a three-dimensional schematic diagram of the local structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the appearance structure of the purification unit of the present invention;

[0027] Figure 4 It is a schematic diagram of the internal structure of the purification unit of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the extrusion mechanism of the present invention;

[0029] Figure 6 It is a schematic diagram of the side frame structure of the present invention;

[0030] Figure 7 It is a schematic diagram of the driving mechanism structure of the present invention;

[0031] Figure 8 It is a schematic diagram of the assembly of the lifting assembly of the present invention;

[0032] Figure 9 It is a schematic diagram of the structure of the lifting assembly of the present invention;

[0033] Figure 10 For the present invention Figure 9 Schematic enlarged view of the structure at position A in

[0034] In the figure:

[0035] 1. Installation frame; 101. Movable door; 2. Conveyor assembly; 3. Drainage cover plate; 4. Purification unit; 401. Vertical plate; 402. Filter screen plate; 403. Catalyst module; 404. Purifying agent module; 405. Activated carbon module; 406. Side frame body; 407. Piezoelectric film; 408. Ultraviolet lamp; 409. Extrusion mechanism; 409a. Fixed plate; 409b. Extrusion rod; 409c. Connecting rod; 409d. First spring; 410. Rubber pad; 411. Flexible seal; 412. Driving mechanism; 412a. Driving frame; 412b. Rack; 412c. Gear; 412d. Cam; 412e. Motor; 412f. Movable rod; 412g. Fixed seat; 412h. Second spring; 5. Water storage tank; 6. Lifting assembly; 601. Diagonal brace unit; 601a. Diagonal brace plate; 601b. Telescopic rod; 601c. Folding frame; 602. Lifting frame; 602a. Adjusting plate; 602b. Connecting seat; 603. Lifting mechanism; 604. Spraying unit; 604a. Spray water pipe; 604b. Spray holes; 604c. Water pump. Detailed implementation manners

[0036] The following further describes the present application in detail with reference to the accompanying drawings. It is necessary to point out here that the following specific implementation manners are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0037] Embodiment 1

[0038] To solve the problems that the purification components of the existing rainwater system are usually fixedly installed, making it difficult to carry out convenient maintenance and repair, the purification process is not perfect enough, making it difficult to effectively remove various pollutants in the rainwater, resulting in the purified water quality being difficult to meet the diverse water use requirements, please refer to Figures 1-4 、 Figure 6, a rainwater collection, purification and reuse system for sponge city provided by the present invention includes an installation frame 1 fixedly arranged at a road surface drain outlet. A drain cover plate 3 is arranged inside the installation frame 1, and the top surface of the drain cover plate 3 is flush with the top surface of the installation frame 1. A rainwater purification assembly is arranged below the drain cover plate 3. The rainwater purification assembly is composed of a plurality of purification units 4 arranged side by side. A conveying assembly 2 for turning the purification unit 4 above the drain cover plate 3 for maintenance is also arranged inside the installation frame 1. The conveying assembly 2 includes a conveyor belt, a driving member for driving the conveyor belt to rotate, and a track fixed on the inner wall of the installation frame 1 and matching with the conveyor belt. Activity doors 101 for the purification unit 4 to pass through are arranged at both ends of the installation frame 1 where the drain cover plate 3 is located. The activity doors 101 allow the purification unit 4 to pass through smoothly, so as to move the purification unit 4 from below the drain cover plate 3 to above for maintenance or replacement operations through the conveying assembly 2. The activity doors 101 have good sealing performance to ensure that rainwater does not leak in the non-operation state, and can be quickly opened and closed to adapt to different operation requirements. When the rainfall is large, they can be fully opened to increase the flow. On sunny days, the rainwater purification assembly can be moved above the ground to be exposed to natural sunlight for effective removal of odors and restoration of its purification ability. At the same time, it is convenient for staff to carry out daily inspections and necessary maintenance work to ensure the long-term stable operation of the system.

[0039] The purification unit 4 includes two vertically arranged plates 401 symmetrically distributed. The vertically arranged plates 401 are fixed on the conveyor belt of the conveying assembly 2. A filter screen plate 402, a catalyst module 403, a purifying agent module 404 and an activated carbon module 405 are rotatably arranged in sequence from top to bottom between the two vertically arranged plates 401. Side frames 406 are arranged on both sides of the two vertically arranged plates 401. A piezoelectric film 407 and an ultraviolet lamp 408 are integrated in the side frames 406. A plurality of sets of pressing mechanisms 409 are arranged on both sides of the bottom of the filter screen plate 402, the catalyst module 403, the purifying agent module 404 and the activated carbon module 405. The pressing mechanisms 409 are used to apply pressure to the piezoelectric film 407 based on the rotation of the filter screen plate 402, the catalyst module 403, the purifying agent module 404 and the activated carbon module 405 to generate a piezoelectric effect to purify rainwater.

[0040] A rubber pad 410 is fixedly arranged on the outer side of the side frame 406. Adjacent two purification units 4 are abutted against each other through the rubber pad 410. The rubber pad 410 not only plays a buffering role to reduce the abrasion of the purification unit 4 caused by vibration or water flow impact during operation, but also can effectively seal the gap between adjacent purification units 4 to prevent untreated rainwater from bypassing the purification assembly, ensuring the integrity and high efficiency of the rainwater purification process.

[0041] The middle parts of the filter screen plate 402, the catalyst module 403, the purifying agent module 404, and the activated carbon module 405 are all provided with rotating shafts rotatably connected to the vertical plate 401; flexible seals 411 are provided between the filter screen plate 402, the catalyst module 403, the purifying agent module 404, and the activated carbon module 405 and the inner wall of the side frame 406. The flexible seals 411 are used to maintain dynamic sealing with the side frame 406 during the rotation of each module, preventing untreated rainwater from leaking through the gaps.

[0042] As Figure 5 shown, the extrusion mechanism 409 includes a fixing plate 409a fixed inside the side frame 406 and a connecting rod 409c rotatably arranged at the bottom of the filter screen plate 402, the catalyst module 403, the purifying agent module 404, or the activated carbon module 405; an extrusion rod 409b is movably penetrated through the fixing plate 409a. One end of the extrusion rod 409b is provided with a ball head structure in contact with the piezoelectric film 407, and the other end is rotatably connected to the end of the connecting rod 409c. A first spring 409d for resetting is sleeved on the extrusion rod 409b to ensure that the extrusion rod 409b can automatically return to the initial position under no load.

[0043] When not under external pressure, the extrusion rod 409b is held in an initial position by the first spring 409d, and its ball head structure lightly touches the piezoelectric film 407 without applying significant pressure. When the filter screen plate 402, the catalyst module 403, the purifying agent module 404, or the activated carbon module 405 rotates around the rotating shaft in the middle, the connecting rod 409c moves accordingly, pushing the extrusion rod 409b to move along the guiding hole on the fixing plate 409a, gradually applying pressure to the piezoelectric film 407. The ball head structure design of the extrusion rod 409b helps to evenly distribute the applied pressure and effectively trigger the piezoelectric effect. When the extrusion rod 409b presses the piezoelectric film 407, charge separation occurs in the piezoelectric material due to mechanical deformation, generating electric energy and decomposing part of the organic pollutants, significantly improving the purification effect. After the rotation action is completed or the external force disappears, the reset force provided by the first spring 409d will make the extrusion rod 409b return to the initial position, preparing for the next operation cycle.

[0044] As Figure 7As shown, a driving mechanism 412 for driving the filter screen plate 402, the catalyst module 403, the purifying agent module 404, and the activated carbon module 405 to reciprocally deflect is provided on the outer side of one of the vertical plates 401; the driving mechanism 412 includes a driving frame 412a slidably arranged on the vertical plate 401, and a plurality of racks 412b are staggeredly arranged on both sides of the inner wall of the driving frame 412a. The end portions of the rotating shafts of the filter screen plate 402, the catalyst module 403, the purifying agent module 404, and the activated carbon module 405 are all fixedly provided with gears 412c meshing with the racks 412b; a cam 412d and a motor 412e for driving the cam 412d to rotate are provided above the driving frame 412a. An active rod 412f is fixedly provided at the bottom of the driving frame 412a, and a fixed seat 412g for the active rod 412f to penetrate through is fixedly provided on the vertical plate 401. A second spring 412h for resetting is sleeved on the active rod 412f.

[0045] When it is necessary to drive the filter screen plate 402, the catalyst module 403, the purifying agent module 404, and the activated carbon module 405 to reciprocally deflect, the motor 412e is started to drive the cam 412d to rotate. As the cam 412d rotates, it gradually pushes the driving frame 412a to slide up and down along the vertical plate 401. The up and down movement of the driving frame 412a causes the staggeredly arranged racks 412b inside it to mesh with the gears 412c on each module in sequence. Since the racks 412b are staggeredly arranged, when the driving frame 412a moves upward or downward, different racks 412b will push the corresponding gears 412c, causing the corresponding modules to generate reciprocating deflection movements. The cam 412d continuously rotates, resulting in the continuous up and down sliding of the driving frame 412a, so that the filter screen plate 402, the catalyst module 403, the purifying agent module 404, and the activated carbon module 405 reciprocally deflect according to a predetermined direction and angle; this kind of deflection not only provides power for the extrusion mechanism 409, but also increases the complexity of the water flow passage, improves the purification efficiency, and can also prevent pollutant deposition through vibration, prolonging the service life of the components.

[0046] Embodiment 2

[0047] On the basis of Embodiment 1, in order to improve the safety of the system and facilitate the reuse of rainwater, such as Figures 8-10As shown in the figure, the installation frame 1 is also provided with a lifting assembly 6 for lifting to mark the range of the drainage cover plate 3; the lifting assembly 6 includes two diagonal bracing units 601 symmetrically distributed on both sides of the drainage cover plate 3, a lifting frame 602, and a lifting mechanism 603 for driving the lifting of the lifting frame 602. The diagonal bracing unit 601 includes a diagonal bracing plate 601a and a telescopic rod 601b located inside the diagonal bracing plate 601a. One end of the diagonal bracing plate 601a is rotatably connected to the installation frame 1, and the other end is rotatably connected to the end face of the upper cross beam of the lifting frame 602 through the telescopic rod 601b. A folding frame 601c is arranged in the inner groove of the diagonal bracing plate 601a, and the folding frames 601c of the two diagonal bracing units 601 are buckled with each other to form a stable support structure.

[0048] At the bottom corners of the installation frame 1, a water storage tank 5 for storing the purified rainwater is fixedly provided; on one side of the upper cross beam of the lifting frame 602, an adjusting plate 602a and a connecting seat 602b are provided. The connecting seat 602b is rotatably connected to the cross beam, and the adjusting plate 602a is rotatably connected to the connecting seat 602b, so that the adjusting plate 602a can flexibly adjust the angle and orientation; a water spraying unit 604 for reusing rainwater is integrated on the adjusting plate 602a. The water spraying unit 604 includes a water spraying pipe 604a and a water pump 604c. A plurality of spray holes 604b are equidistantly distributed on the water spraying pipe 604a. The water pump 604c is used to pump the rainwater in the water storage tank 5 into the water spraying pipe 604a to realize the reuse of rainwater.

[0049] When there is no operation, the lifting frame 602 is in the lowest position, the diagonal bracing unit 601 is horizontally located on the side of the drainage cover plate 3, and the folding frame 601c is completely retracted into the inner groove of the diagonal bracing plate 601a. The overall structure is compact and does not occupy extra space; when encountering heavy rain, the lifting mechanism 603 is started to push the lifting frame 602 to move upward. As the lifting frame 602 rises, the telescopic rod 601b of the diagonal bracing unit 601 gradually unfolds, and at the same time, the folding frames 601c of the two diagonal bracing units 601 are gradually opened and buckled with each other to form a stable triangular support structure, thus significantly marking the range of the drainage cover plate 3 and playing a warning role to avoid pedestrians or vehicles from making mistakes; when it is necessary to reuse the purified rainwater, the water pump 604c is started to pump the rainwater in the water storage tank 5 into the water spraying pipe 604a. A plurality of spray holes 604b on the water spraying pipe 604a are evenly distributed, and can spray rainwater with a certain pressure and angle to cover a large range. The adjusting plate 602a flexibly adjusts the angle through the connecting seat 602b, so that the water spraying direction can be finely adjusted according to actual needs, such as for watering the surrounding green belts, cleaning the road surface or other purposes.

[0050] Embodiment III

[0051] On the basis of Embodiment I and Embodiment II, the present invention also provides a method for collecting, purifying and reusing rainwater in a sponge city, including the following steps:

[0052] S1. Rainwater enters the rainwater purification component through the drainage cover plate 3. The rainwater is purified step by step by the rainwater purification component to remove various pollutants in the rainwater. Specifically, large particulate suspensions are initially removed through the filter plate 402, and then the organic pollutants in the rainwater are further decomposed and transformed through the cooperation of the catalyst module 403 and the ultraviolet lamp 408. Next, the harmful substances in the rainwater are neutralized and adsorbed through the purification agent module 404. Finally, the peculiar smell and residual chemical pollutants are adsorbed through the activated carbon module 405;

[0053] Among them, during the process of rainwater flowing through each layer of the purification module, the filter plate 402, the catalyst module 403, the purification agent module 404, and the activated carbon module 405 are driven to rotate, and pressure is applied to the piezoelectric film 407 to generate a piezoelectric effect to assist in purifying the rainwater;

[0054] Among them, when the rainwater purification component needs to be cleaned and maintained, the driving member of the conveying component 2 is started. The driving member drives the conveyor belt to run on the track. The rainwater purification component connected to the conveyor belt gradually moves upward above the drainage cover plate 3 as the conveyor belt runs. During the movement of the rainwater purification component, it passes through the movable doors 101 at both ends of the drainage cover plate 3 until it is completely turned over above the drainage cover plate 3 for cleaning and maintenance;

[0055] S2. A part of the purified rainwater is transported to the city's water storage facilities through pipelines to provide water sources for subsequent reuse, and the other part is stored in the water storage tank 5 to irrigate the surrounding green belts, clean the road surface, wash the rainwater purification component or for other uses.

[0056] The above embodiments only represent one implementation manner of the present invention, and its description is relatively specific and detailed, but it should not be understood as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A sponge city rainwater collection, purification and reuse system, comprising a mounting frame (1) fixedly arranged at a road surface drainage outlet, characterized in that: The installation frame (1) is provided with a drainage cover plate (3), a rainwater purification assembly is provided below the drainage cover plate (3), the rainwater purification assembly is composed of a plurality of purification units (4) arranged side by side, the installation frame (1) is also provided with a conveying assembly (2) for flipping the purification unit (4) to the top of the drainage cover plate (3) for maintenance, the conveying assembly (2) comprising a transmission belt, a driving member for driving the transmission belt to rotate, and a track fixed on the inner wall of the installation frame (1) and matching the transmission belt; Movable doors (101) for the purification unit (4) to pass through are provided in the installation frames (1) at both ends of the drainage cover plate (3).

2. A sponge city rainwater collection, purification and reuse system according to claim 1, characterized in that: The purification unit (4) comprises two symmetrically distributed vertical plates (401), a filter plate (402), a catalyst module (403), a purifier module (404) and an activated carbon module (405) are arranged between the two vertical plates (401) in a rotational manner from top to bottom, and side frames (406) are arranged on both sides of the two vertical plates (401), and a piezoelectric film (407) and an ultraviolet lamp (408) are integrated in the side frames (406); A plurality of extrusion mechanisms (409) are provided on both sides of the bottom of the filter plate (402), the catalyst module (403), the purifier module (404) and the activated carbon module (405). The extrusion mechanisms (409) are used to apply pressure to the piezoelectric film (407) based on the rotation of the filter plate (402), the catalyst module (403), the purifier module (404) and the activated carbon module (405) to generate a piezoelectric effect to purify rainwater.

3. A sponge city rainwater collection, purification and reuse system according to claim 2, characterized in that: A rubber pad (410) is fixedly provided on the outer side of the side frame (406), and two adjacent purification units (4) are in contact with each other via the rubber pad (410).

4. A sponge city rainwater collection, purification and reuse system according to claim 2, characterized in that: The filter plate (402), the catalyst module (403), the purifier module (404) and the activated carbon module (405) are all provided with a rotating shaft rotatably connected to the vertical plate (401) in the middle. Flexible sealing members (411) are provided between the filter plate (402), the catalyst module (403), the purifier module (404), the activated carbon module (405) and the inner wall of the side frame (406).

5. A sponge city rainwater collection, purification and reuse system according to claim 4, characterized in that: The squeezing mechanism (409) comprises a fixing plate (409a) fixed in the side frame (406) and a connecting rod (409c) rotatably arranged at the bottom of the filter plate (402), the catalyst module (403), the purifier module (404) or the activated carbon module (405); A squeezing rod (409b) is movably provided on the fixed plate (409a), one end of the squeezing rod (409b) is provided with a ball head structure abutting against the piezoelectric film (407), and the other end is rotatably connected to the end of the connecting rod (409c), and a first spring (409d) for resetting is sleeved on the squeezing rod (409b).

6. A sponge city rainwater collection, purification and reuse system according to claim 5, characterized in that: A driving mechanism (412) for driving the filter plate (402), the catalyst module (403), the purifier module (404) and the activated carbon module (405) to reciprocate is provided on the outer side of one of the vertical plates (401); The driving mechanism (412) comprises a driving frame (412a) slidably arranged on the vertical plate (401), a plurality of racks (412b) are staggeredly arranged on both sides of the inner wall of the driving frame (412a), and gears (412c) meshing with the racks (412b) are fixedly arranged at the ends of the rotating shafts of the filter plate (402), the catalyst module (403), the purifier module (404) and the activated carbon module (405); A cam (412d) and a motor (412e) for driving the cam (412d) to rotate are provided above the driving frame (412a); a movable rod (412f) is fixedly provided at the bottom of the driving frame (412a); a fixing seat (412g) for the movable rod (412f) to pass through is fixedly provided on the vertical plate (401); and a second spring (412h) for resetting is sleeved on the movable rod (412f).

7. The sponge city rainwater collection, purification and reuse system according to claim 1 is characterized by: The installation frame (1) is also provided with a lifting component (6) for lifting to mark the range of the drainage cover plate (3); The lifting assembly (6) comprises two diagonal support units (601) symmetrically distributed on both sides of the drainage cover plate (3), a lifting frame (602), and a lifting mechanism (603) for driving the lifting frame (602) to move up and down; the diagonal support unit (601) comprises a diagonal support plate (601a) and a telescopic rod (601b) located inside the diagonal support plate (601a); one end of the diagonal support plate (601a) is rotatably connected to the installation frame (1), and the other end is rotatably connected to the upper end face of the cross beam of the lifting frame (602) through the telescopic rod (601b); a folding frame (601c) is provided in the inner groove of the diagonal support plate (601a), and the folding frames (601c) of the two diagonal support units (601) are interlocked.

8. The sponge city rainwater collection, purification and reuse system according to claim 7 is characterized by: A water storage tank (5) for storing purified rainwater is fixedly provided at a bottom corner of the installation frame (1); An adjustment plate (602a) and a connection seat (602b) are provided on one side of the upper end crossbeam of the lifting frame (602), the connection seat (602b) is rotatably connected to the crossbeam, and the adjustment plate (602a) is rotatably connected to the connection seat (602b); The regulating plate (602a) is integrated with a water spray unit (604) for reusing rainwater. The water spray unit (604) comprises a water spray pipe (604a) and a water pump (604c). The water spray pipe (604a) is provided with a plurality of spray holes (604b) distributed at equal intervals. The water pump (604c) is used to draw rainwater in the water storage tank (5) into the water spray pipe (604a).

9. A method for collecting, purifying and reusing rainwater in a sponge city, using a system for collecting, purifying and reusing rainwater in a sponge city as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1, rainwater enters the rainwater purification component through the drainage cover plate (3), and the rainwater is purified step by step by the rainwater purification component to remove various pollutants in the rainwater; When the rainwater purification component needs to be cleaned and maintained, the driving member of the conveying component (2) is started, and the driving member drives the transmission belt to run on the track. The rainwater purification component connected to the transmission belt gradually moves above the drainage cover plate (3) as the transmission belt runs. During the movement, the rainwater purification component passes through the movable doors (101) at both ends of the drainage cover plate (3) until it is completely turned over to the top of the drainage cover plate (3) for cleaning and maintenance. S2. The purified rainwater is transported to the city’s water storage facilities through pipes, providing water for subsequent reuse.

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