1455 results about "Sewerage" patented technology

The invention provides a sewer internal defect detection method and system based on YOLOv11 improvement, and the method achieves the dynamic weight fusion of multi-level features through a self-adaptive feature fusion module, and improves the detection capability of a model for small targets and complex backgrounds. The selectivity of channel characteristics is improved through an SENet attention mechanism, and background interference is reduced; and introducing an MPDIOU loss function to improve bounding box regression loss. The performance of the improved model in detection tasks of sewer defects such as cracks, obstacles, corrosion, deformation and the like is remarkably superior to that of original YOLOv11, and particularly key indexes such as mAP50 (average precision), Box precision (P), recall rate (R) and the like are remarkably improved. According to the invention, efficient and accurate detection of multiple types of defects in the sewer can be realized, and a better solution is provided for maintenance and management of the sewer.

The invention discloses a municipal sewer sludge treatment device, and relates to the technical field of environmental protection, the municipal sewer sludge treatment device comprises a base, the inner wall of the base is provided with a tank body, the bottom of the tank body is provided with a liquid outlet valve, the rear side of the tank body is provided with a feeding device, and the tank body is internally provided with a dosing device and a stirring device; sludge can be pushed to flow in a feeding opening through a first rotating motor, a first rotating disc, a crank rod, a sliding rod and a dredging rod, sludge accumulation and blockage are avoided, sludge in a fixing cylinder is gradually discharged into a tank body through the first rotating disc and a spiral rod, and the sludge is smashed through rotation of a cutting rod when entering the tank body; the size of sludge particles can be reduced by smashing the sludge, so that the dewatering performance of the sludge is improved, the water content of the sludge is reduced, the sludge enters the tank through the fixed cylinder, the knocking rod is in contact with the outer wall of the fixed cylinder to generate vibration, and the vibration can help the sludge to flow better.

Disclosed are a cleaning robot and a supporting cleaning table. A sweeping assembly and a dust suction squeegee are provided at the front of the cleaning robot; a water suction squeegee (8), which is internally provided with two mopping rolling brushes (9) for flushing water outwards from the axis, is provided at the rear; and following this, a wastewater tank (11), a clean-water tank (12), an air suction fan (13), an intelligent controller (15), a battery (14), a small water suction squeegee (16) and a hot-air blower (17) are provided. The air suction fan (13) performs air suction on a garbage box (5), the dust suction squeegee (6), the water suction squeegee (8), the wastewater tank (11) and the small water suction squeegee (16). A funnel (62) is provided in the cleaning table; a water supply pipe, clean-water and liquid-soap electromagnetic valves (77), a charger (74) and an intelligent controller (68) are provided in a functional wall (59) of the cleaning table; and a liquid-soap box (61) is erected on the functional wall (59). The cleaning robot climbs onto the cleaning table along a ramp door plate (57), and can automatically perform garbage dumping and wastewater discharging, and water adding and charging. The ramp door plate (57) can be automatically upturned into a door plate and downturned again when needed. A garbage grinder (79) is provided under the funnel (62), and garbage is ground into slurry sludge and is then discharged into a sewer together with wastewater. The technical effects of deep cleaning and no need for manual intervention during the whole process are achieved.

The invention discloses a rapid rainwater drainage device for urban inland inundation. The rapid rainwater drainage device comprises a self-elastic ejector rod and a floating ball locking mechanism. The self-elastic ejector rod is fixedly connected with the rainwater grate, and a transverse locking rod is arranged on the self-elastic ejector rod; the floating ball locking mechanism is arranged in the water falling well, and the floating ball locking mechanism comprises a one-way lock tongue associated with the transverse lock rod; when the one-way lock tongue locks the transverse lock rod, the rainwater grate covers the well mouth of the water falling well in a sealing mode, and when the one-way lock tongue is separated from the transverse lock rod, the self-elastic ejector rod jacks the rainwater grate upwards, and the well mouth of the water falling well is opened. The drainage device is ingenious in structure, convenient to use and low in maintenance cost, the grate plate is automatically controlled to ascend and descend through a full-mechanical mechanism, and therefore rapid and large-amount drainage of the sewer in the rainstorm period is achieved; the grate plate is always kept in a horizontal state and ascends and descends in the vertical direction, so that the water outlet is effectively prevented from being exposed, and the safety of road passing is improved.

The embodiment of the utility model discloses a fluid processing device and a base station. The fluid processing device comprises a first shell, a driving part, a driving rotor and a driven rotor, the driving rotor is located in the containing space of the first shell, the driven rotor is located outside the containing space of the first shell, the driven rotor is partially located in the containing component, and the driving rotor is isolated from the containing component; the driving rotor comprises a first magnetic assembly, the driven rotor comprises a second magnetic assembly or a magnetic attraction assembly, and the driving rotor is used for generating circumferential driving force on the driven rotor so that the driven rotor can rotate to improve the solvent dissolving effect, or stirring sewage in the containing part to remove dirt attached to the inner wall of the containing part. The cleanliness of the containing part is improved, and the influence of attached dirt on the measuring part is avoided; the dirt is crushed by utilizing the impact force of water flow and the mechanical force generated by stirring, so that the dirt is prevented from blocking an inlet and an outlet of the sewage tank, a suction pipeline and a channel leading to a sewer.

The invention relates to the field of sewage and wastewater treatment and discharge, in particular to a wastewater treatment and discharge device which comprises a first drainage pipe, a water collection plate is fixedly connected to the bottom of the inner side of the first drainage pipe, and a rainwater collection mechanism is mounted in the first drainage pipe and comprises a connecting rod in sliding connection with the first drainage pipe. The bottom of the connecting rod is connected with a water collecting air bag, the top of the connecting rod is connected with a circular plate, sewage pipes are arranged on the two sides of the first drainage pipe, one sides of the sewage pipes are connected with side pipes communicated with the first drainage pipe, the bottom of the first drainage pipe is connected with a second drainage pipe, and the two sides of the second drainage pipe are connected with grease pipes. And along with various kinds of garbage, according to the equipment, rainwater is firstly collected, then buoyancy generated by the rainwater on the water collecting air bag is utilized, the garbage gathered at the inlet is pushed to move upwards, the blocked garbage is discharged, rainstorm water is helped to be rapidly drained away, and the problem that a sewer pipeline is blocked is avoided.

The utility model relates to an inspection well and belongs to the technical field of sewers, the inspection well comprises a well body, a well lid and a grating plate, the well body is embedded in the ground, the well body is hollow, the upper end of the well body is open, the side wall, close to the bottom, of the well body is communicated with a pipeline, and the well lid is arranged on the well body and used for sealing the opening in the upper end of the well body; the grating plate is arranged on the inner side wall of the well body in a hinged mode, and the grating plate is used for blocking the communication position of the well body and the outflow pipeline. The device has the advantages that the problem that the pipeline is prone to being blocked or even collapsed is solved, and workers can conveniently rotate the grating plate away from the communicating position of the well body and the outflow pipeline and then maintain the outflow pipeline.

A lining tube for restoring a defective sewer shaft has an inner film tube and a radially expandable tubular layer of fiber material impregnated with a curable reaction resin. The inner film tube has a connecting portion that connects two circumferential portions, to a circurmferentially closed inner film tube with a defined nominal diameter. The connecting portion has a predetermined breaking point that can be separated in the circumferential direction by introducing a pressure medium into the inner film tube in order to radially expand the inner film tube and the layer of fibrous material beyond the nominal diameter. The tubular layer of fiber material is closed by a seam at a first end that can be introduced into a channel of the sewer shaft. The seam extends orthogonally to the longitudinal axis of the tubular layer of fiber material of the lining tube.

The utility model discloses a high-stability road subgrade slope protection structure, and relates to the technical field of protection structures. The first vertical plate is arranged at the top of the first connecting plate; the first stabilizing plate is arranged on the right side of the top of the first connecting plate, the right end of the first stabilizing plate is fixedly connected with a plurality of buffer rods, and the multiple buffer rods all penetrate through the second stabilizing plate and are movably connected with the second stabilizing plate; the left end of the second connecting plate is fixedly connected with the lower end of a second stabilizing plate; the second vertical plate is arranged in the middle of the top of the second connecting plate; the slope net is arranged at the top of the second connecting plate, and meanwhile, the slope net is also arranged at the right end of the second stabilizing plate; the three ventilation openings are evenly formed in the top of the slope net. The planting areas are evenly arranged on the slope of the slope net at equal intervals. A plurality of groups of water filtering holes are formed in the left side of the inner wall of the sewer. According to the scheme, through the T-shaped stabilizing assembly and the water filtering assembly, the stability of the roadbed and the slope is improved.

The utility model relates to a closestool deodorization device for a closestool. The closestool deodorization device comprises a main body shell, an air suction fan installed in the main body shell, an air suction assembly and an air discharge assembly. The main body shell is provided with an air inlet and an air outlet, wherein the air inlet is connected with an air suction inlet device. The air discharge assembly defines an air discharge passage extending from the exhaust port to the sewage passage below the toilet, includes an exhaust pipe forming a portion of the air discharge passage, and extends from the exhaust port through the lower connection portion of the toilet up to the sewage passage below the toilet. When the suction fan is activated, air is sucked from the periphery of the upper edge portion of the toilet bowl and discharged to the sewage channel through the toilet bowl deodorization device, thereby minimizing odor emitted from the toilet bowl.

An improved securable temporary manhole or catch basin cover is disclosed herein. In one embodiment, the cover comprises a central segment attached to an inflatable element, which may be a bladder, tube, or tire. In another embodiment, an apron and / or a caulking layer is provided for the protection of the cover. Depending on the embodiment, the cover may be used with or without the apron and / or the caulking layer. In an alternate embodiment, the central segment comprises a plurality of tightening mechanisms around a perimeter of the central segment. Regardless of the embodiment, the cover disclosed herein is a unique, portable, and durable solution that improves the state of the art by facilitating the prevention of debris from falling into the sewers and allowing for easy removal of said debris from the top of the cover.

The invention relates to a carport comprising a support structure (10) and a roof structure (14) supported by the support structure (10). The carport is equipped with a water reservoir (26) in the support structure (10), and the roof structure (14) has a gutter and / or channel system (25) connected to the water reservoir (26). The roof structure (14) has a maintenance walkway (12) at its lowest roof level, to which rainwater flows from the roof structure (14) and which is connected to the water reservoir (26) via the gutter and / or channel system (25). The roof structure (14) is equipped with mounting devices for securing solar panels (11).The invention is characterized in that the maintenance passage (12) is designed as a coarse filter (30) which is arranged in the direction of water flow upstream of an inlet to the channel and / or duct system (25), and that a fine filter (35) is arranged in the channel and / or duct system (25) between the inlet and the water reservoir (26), which filters out smaller particles than the coarse filter (30).

The invention discloses an urban and rural sewer intelligent planning method and system based on artificial intelligence, and relates to the technical field of urban and rural sewer intelligent planning, and the method comprises the following steps: obtaining topological structure data and historical rainwater flow data of an urban and rural sewer system, constructing a first pipe network feature set, and carrying out the pipe diameter change analysis; calculating a flow velocity difference at a pipe diameter sudden change position so as to identify an air retention area; constructing a sewer graph model, and traversing the sewer graph model by adopting a graph search algorithm to obtain an air retention subnet; carrying out feature constraint on the air retention subnet to obtain a diversion judgment node set and identifying a diversion pipe network path set; according to the method, flow evaluation is carried out on the diversion pipe network path set, and the diversion pipe network path set is screened according to an evaluation result to obtain an optimal diversion pipe network path which is used for dynamic diversion of the sewer, so that the problem that in urban and rural sewers, the flow velocity difference of rainwater peak flow is caused by sudden change of the pipe diameter is solved; and air retention is formed, so that normal flowing of fluid is hindered.

The invention relates to the field of sewage treatment, in particular to a treatment method and system for a sludge hydrothermal carbonization solution. The treatment method provided by the invention comprises the following steps: adjusting the pH value of the sludge hydrothermal carbonization solution to 5-6 to obtain an initially adjusted carbonization solution; carrying out hydrolytic acidification reaction on the primarily adjusted carbonized solution to obtain a hydrolytic acidification carbonized solution; carrying out methanogenesis reaction on the hydrolytic acidification carbonization solution to obtain an anaerobic digestion carbonization solution; performing multi-stage anaerobic-aerobic denitrification treatment on the anaerobic digestion carbonization solution to obtain a denitrified carbonization solution; dephosphorizing the denitrified carbonized solution to obtain a dephosphorized carbonized solution; and carrying out resin adsorption on the dephosphorized carbonized liquid, and then discharging the dephosphorized carbonized liquid. The treatment method provided by the invention can effectively remove organic matters and nitrogen and phosphorus compounds contained in the sludge hydrothermal carbonization liquid. The concentrations of various pollutants in the discharged water meet the water quality standard of sewage discharged into urban sewers, and the problem of secondary pollution to the environment caused by wastewater generated by a sludge hydrothermal carbonization technology is solved.

The invention provides a low-power-consumption cooperative sewer water body integrated monitoring method. The method comprises the following steps: carrying out model selection and deployment on sensing node hardware of an adaptive scene; a low-power-consumption internet of things network topology and power supply design; a time-sharing triggering acquisition strategy of the multi-modal data is carried out; node-level environment self-adaptive data calibration is carried out; node-level flow velocity-stink association anomaly recognition is carried out; carrying out network-level data fusion and validity verification; collaborative traceability, diffusion simulation and linkage control are carried out. According to the invention, the problems of data distortion, difficulty in source tracing of pollution sources, short equipment endurance and response lag caused by independent collection of flow and stink and environmental interference in traditional sewer monitoring are solved; the integrated effect of ultrasonic Doppler and electronic nose cooperative monitoring, environment self-adaption accurate calibration, odor source rapid positioning and diffusion simulation and low-power-consumption and long-endurance linkage control is achieved.

The utility model discloses a municipal engineering sewer desilting device in the technical field of municipal engineering, which comprises a base and a cleaning cylinder, the cleaning cylinder is positioned above the base, the rear side of the top of the base is fixedly connected with a collecting cylinder, the lower side of the rear side of the outer side wall of the collecting cylinder is fixedly connected with a blow-off pipe, and the blow-off pipe is fixedly connected with a drainage pipe. A screen is fixedly connected to the middle of the inner side wall of an inner cavity of the collecting barrel, a transmission bin is formed in the upper side of the inner wall of the collecting barrel, a first motor is fixedly connected to the front side wall of an inner cavity of the transmission bin, and a mounting rod is fixedly connected to the rear end of a power output shaft of the first motor; first driving gears are fixedly connected to the front side and the rear side of the outer side wall of the mounting rod, and first threaded rods are rotatably connected to the front side and the rear side of the bottom of an inner cavity of the transmission bin. And garbage in the sludge can be separated.

The present utility model relates to the technical field of toilets, and disclosed is a novel toilet for kids, comprising a lower seat. An upper seat is arranged at the upper end of the lower seat; a toilet bowl is arranged in the upper seat; a water inlet valve is arranged in the upper seat; a water sprayer for spraying water is arranged at the left side end of the water inlet valve; and the left side end of the water sprayer is located inside the toilet bowl. According to the present utility model, a discharge port is arranged on the toilet bowl, and the lower seat is provided with a liquid collecting tank and a drain port, such that urine and flushing water are directly introduced into a sewer; and the water inlet valve and the water sprayer are arranged, such that the toilet bowl can be directly cleaned, and urine and flushing water can directly flow into the sewer. The toilet bowl can be taken out for conveniently pouring excrement, and can be directly flushed after being put back, thereby solving the sanitation problem caused by cleaning the toilet bowl at other places. The time for cleaning the toilet bowl by adults is greatly shortened, and the sanitary level is improved. Kids can independently use and flush the toilet.

The invention discloses a sewer sewage filter valve with a self-switching filter screen, and belongs to the technical field of sewer sewage filtration, the sewer sewage filter valve comprises a valve body, a water inlet pipe is fixed on one side of the valve body, a support shaft is rotatably arranged in the valve body, and a self-switching mechanism is arranged on the side of the filter screen; the movable shaft rotationally penetrates through the interior of the water inlet pipe, fixing blocks are arranged on the outer side of the movable shaft at equal angles, and the cleaning assembly is arranged at the top of the valve body; and the adjusting mechanism is arranged between the cleaning assembly and the valve body, and the adjusting mechanism is used for adjusting communication and plugging between the cleaning assembly and the valve body and between the water outlet pipe and the valve body. The filter screen self-switching type sewer sewage filter valve is provided with a filter screen self-switching structure, and the filter screen does not need to be manually detached for replacement, so that the phenomenon of poor sewage discharge effect caused by untimely replacement can be avoided, intercepted garbage can be conveniently cleaned out, and the influence of a large amount of residual garbage on subsequent sewage discharge smoothness is prevented.

A recreational vehicle waste delivery system with lengths of 3D cylindrical non-flexible tube and of 3D cylindrical flexible-tube, a first-coupler and, a second-coupler. The first coupler, the at least one flexible-tube, the second-coupler and the at least one flexible-tube in combination are able to be removably couplable modularly in series to provide an adjustable, modular waste management system for delivering waste from an rv to an in-ground sewer connection when engaged with a disposal fitting of the rv.

Pump unit (1, 110) for a hydraulic system comprising a housing (2) and a connection area (3), wherein the housing (2) defines an interior space (4), the interior space (4) being substantially cylindrical and forming at least a portion of an oil reservoir (T) that can be filled with hydraulic oil; and at least one pump element and at least one submersible electric motor (5) driving the pump element are arranged in the interior (4); wherein the connection area (3) has a pressure channel (6) with a pressure channel opening (7) and a return channel (8), wherein the pressure channel opening (7) is connected to the pump element and the return channel (8) opens into the interior (4) via a return opening (9), wherein the pump unit (1) has a channel element (100, 111) arranged in the interior (4) with a channel element inlet (101) and a channel element outlet (102), wherein the channel element (100) is formed separately from the housing (2), wherein the channel element inlet (101) is connected to the return opening (9), and the channel element outlet (102) is spaced from the connection area (3) such that the channel element outlet (102) projects into the interior (4) below an oil level (S) in the oil reservoir (T) which is established during operation of the pump unit (1), wherein the channel element outlet (102) is offset by at least 45° to 120° relative to the return opening (9) in the circumferential direction of the interior space (4), and the central axis (MA) of the channel element outlet (102) is not parallel to the central axis (MR) of the return opening (9), and wherein the housing (2) has at least one fastening element (11) and wherein the channel element (100) has at least one fastening means (105) fixed to the fastening element (11).

The utility model relates to a pipeline deodorization device which comprises a water tank, a condensate water inlet pipe, a mounting pipe, a breather pipe and a water adding pipe are inserted into the upper end of the water tank, an electromagnetic valve is further arranged on the water adding pipe, a rubber plug is inserted into the upper portion of the mounting pipe in a sealed mode, and two wires are inserted into the rubber plug in a penetrating mode; the lower ends of the two wires are respectively connected with a high water level probe and a low water level probe; the high-water-level probe and the low-water-level probe are connected with a controller through wires, the controller is further connected with an electromagnetic valve through a connecting wire, and a water outlet pipe for draining water is inserted in the middle of the outer side of the water tank. According to the structure provided by the embodiment of the invention, when the air conditioner is not used, water can be supplemented into the water tank in time, so that odor of a sewer is prevented from entering the condensate pipe; the outer side of the blocking frame can block the inlet of the water outlet pipe, so that a large amount of unpleasant odor in the sewer is prevented from entering the water tank, and meanwhile, a large amount of bacteria in the sewer can be prevented from entering the water tank.

The invention relates to the field of sewage detection equipment, in particular to a sewer sewage collection device for sewage detection, which comprises a main body shell, the outer surface of the main body shell is fixedly connected with an anti-collision mechanism, the anti-collision mechanism comprises a protective plate, the outer surface of the protective plate is fixedly connected with a first spring, and the outer surface of the first spring is fixedly connected with a support rod. The inner wall of the support rod is provided with an ejector rod, the inner wall of the support rod makes contact with the outer surface of the ejector rod, the outer surface of the ejector rod is fixedly connected with a square block, the inner wall of the square block is rotationally connected with a push rod, the outer surface of the push rod is rotationally connected with an arc-shaped plate, the outer surface of the arc-shaped plate is fixedly connected with a scraping mechanism, and the outer surface of the push rod is fixedly connected with a connecting block. A second spring is fixedly connected to the outer surface of the connecting block, due to movement of the push rod, the scraping mechanism cleans the surface of the main body shell, and it is guaranteed that the surface can be cleaned while the main body shell is not damaged.

The invention relates to the technical field of municipal engineering, in particular to a sewer plugging device. According to the technical scheme, the sewer plugging device comprises an inflatable air bag, a sliding cylinder structure capable of relatively sliding front and back, an umbrella-shaped supporting frame and a fixed supporting piece, the inflatable air bag is fixedly arranged at the front end of the sliding cylinder structure, and the umbrella-shaped supporting frame is in driving connection with the sliding cylinder structure; the fixed supporting piece is fixedly arranged at the tail end of an outer supporting rod of the umbrella-shaped supporting frame. The device has the beneficial effects that the whole structure does not need to utilize power mechanisms such as electric power or hydraulic power mechanisms and can effectively adapt to the underwater operation environment.

A recreational vehicle waste delivery system with lengths of 3D cylindrical non-flexible tube and of 3D cylindrical flexible-tube, a first-coupler and, a second-coupler. The first coupler, the at least one flexible-tube, the second-coupler and the at least one flexible-tube in combination are able to be removably couplable modularly in series to provide an adjustable, modular waste management system for delivering waste from an rv to an in-ground sewer connection when engaged with a disposal fitting of the rv.

Method for treating wastewater (3) in a treatment section (2) of a sewer (1), wherein in the treatment section (2) ▪ at a first introduction point (4) gas bubbles (7) containing oxygen and / or ozone are introduced into the wastewater (3), of which at least 50% have a maximum diameter of 500 nm, and ▪ the waste water (3) is then passed through at least part of a heat exchange device (8) and is thereby thermally treated, wherein the heat exchange device (8) is spaced a maximum of 5 m from the first introduction point (4).

A shower drain and a method for draining off excess water from a floor to a sewer are provided which includes: a water inlet unit configured to receive the excess water; a double layer water outlet unit, mechanically coupled to the water inlet module to form a reservoir having a bottom connecting chambers that contain a body of water at a predetermined height that force the excess water beyond said predetermined height to overflow into the sewer; and a water level sensor circuitry placed inside double layer water outlet unit for transmitting the water level information inside the reservoir.

The utility model relates to a drainage system for a coffee machine and a coffee purifying and drinking all-in-one machine, which comprise a water pan, a sewage container with a water inlet and a water outlet, and a sewage pump, the water pan is provided with a water outlet, the water outlet is communicated with the water inlet through fluid, the sewage pump is an impeller pump, and the water outlet is communicated with the water outlet through fluid. A water inlet interface of the sewage pump is in fluid communication with the water outlet, and a water outlet interface leads to a sewer. Liquid contained in the water receiving plate flows into the sewage container and then is discharged into the sewer through the sewage pump, a user does not need to frequently pour the water receiving plate, the use experience of the user is improved, the purifying and coffee drinking all-in-one machine has the functions of direct drinking purified water output, milk foam output and coffee output at the same time, and the purifying and coffee drinking all-in-one machine is suitable for popularization and application. And the water receiving plate is used for receiving dropping liquid of the direct drinking opening, the milk foam opening and the coffee opening respectively, so that waste liquid generated in various functions can be discharged through the drainage system.

The drainage structure of the medicine bathtub relates to the technical field of drainage and comprises a bathtub bottom wall, a drainage opening is formed in the upper end of the bathtub bottom wall, a drainage pipe is fixedly connected to the lower end of the bathtub bottom wall, a drainage assembly is arranged at the lower end of the drainage pipe and comprises a drainage box, and an installation frame is fixedly connected to the inner side wall of the drainage box. A first filter plate is fixedly connected to the upper end of the mounting frame, a water outlet is formed in the side wall of the drainage box, a connecting box is fixedly connected to the side wall of the drainage box in a sealed mode, a collecting box is fixedly connected to the lower end of the connecting box in a sealed mode, and a collecting box is arranged in the collecting box. The medicine residues cannot directly flow into the sewer along with the liquid medicine and are collected by the collecting box in the collecting box, the problem that the medicine residues enter the sewer to block the sewer is avoided, the medicine in the medicine bathtub does not need to be fished during use, and a user can use the medicine bathtub more conveniently.

The well lid for municipal engineering comprises a bottom rectangular frame plate, the top of the bottom rectangular frame plate is fixedly connected with a connecting base, a cover plate is arranged in the connecting base, the cover plate is rotationally connected with the connecting base, and an upper rectangular frame plate, a lower rectangular frame plate and a net bag are arranged in the connecting base. The net bag is arranged in the connecting base, the net bag is fixed by the upper rectangular frame plate and the lower rectangular frame plate, the edge of the net bag is located between the upper rectangular frame plate and the lower rectangular frame plate, the net bag is clamped and fixed by the upper rectangular frame plate and the lower rectangular frame plate through bolts, and the cover plate is located over the upper rectangular frame plate. The net bag filters passing water flow, garbage such as plastic bags and leaves entering a sewer is reduced, meanwhile, the net bag carries objects falling from pedestrians and prevents the objects from falling into the sewer, the pull rope connected with the net bag is pulled through the grid-shaped strip-shaped hole preset in the cover plate, the net bag moves upwards, and the objects are prevented from falling into the sewer. And people who fall articles can conveniently take out the articles.