CN212504299U

CN212504299U - Top structure of water inlet grit chamber

Info

Publication number: CN212504299U
Application number: CN202021215057.0U
Authority: CN
Inventors: 张长虹; 张斌锋; 周林波; 李建宏; 姬皓; 陈彦
Original assignee: Chongqing Bishan Biqing Water Co ltd
Current assignee: Chongqing Bishan Biqing Water Co ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-02-09
Anticipated expiration: 2030-06-28

Abstract

The utility model discloses a top structure of a water inlet grit chamber, wherein a track for arranging a bridge type sand sucker is arranged at the top of the upper end of the grit chamber along the length direction; the sand setting tank is internally provided with a sand setting groove in the middle, the left side and the right side of the sand setting groove are provided with scum grooves, the outside of the scum groove on one side of the sand setting tank extends outwards and is provided with a sand discharge groove in a suspension manner, the sand setting tank and/or the scum grooves and/or the sand discharge groove are/is provided with a movable sealing structure at the upper end notch position, and the middle position of the movable sealing structure is provided with an elastic opening for the vertical component of the bridge type sand sucker to be inserted and movably matched. The utility model has the advantages of better avoiding the volatilization of sewage odor and improving the environmental sanitation; meanwhile, the travelling sand suction of the sand suction machine is facilitated, and the cable protection effect, the sanitation and the like are good.

Description

Top structure of water inlet grit chamber

Technical Field

The utility model relates to a grit chamber of intaking for domestic sewage handles, concretely relates to grit chamber top structure of intaking.

Background

Urban domestic sewage can be intensively discharged to a sewage treatment plant for treatment. When sewage treatment is performed in a sewage plant, no matter which process is adopted, a water inlet pretreatment process of physically filtering sewage is generally required. Taking the activated sludge method as an example, the method is used for primarily filtering sewage inflow to remove impurities such as larger silt, scum and the like in the sewage, and is beneficial to subsequent activated sludge inoculation to realize biochemical filtration, thereby improving the subsequent biochemical filtration treatment effect.

The sewage inlet filtering treatment system in the existing sewage treatment plant generally comprises a coarse filtering grid and a fine filtering grid which are arranged at the sewage inlet position of the sewage treatment plant, and a grit chamber positioned between the coarse filtering grid and the fine filtering grid. The grit chamber is usually in an aeration grit chamber structure, namely an aeration device is arranged below the inner wall of the chamber body, the aeration device can aerate sewage and generate rotational flow, and the rotational flow is beneficial to throwing larger sand grains out of the chamber wall under the action of centrifugal force and depositing the larger sand grains in a sand collecting hopper at the bottom of the chamber. For sludge treatment deposited in a sand collecting hopper at the bottom of the tank, a sand sucker of the settling tank which is arranged on the sand settling tank in a matching way is usually adopted to suck sludge. The existing sedimentation tank sand sucker generally adopts a bridge type sand sucker to form, the equipment structure mainly comprises a main beam as a machine body, the lower end of the main beam is matched on a track at the upper end of a sedimentation tank body by virtue of a roller, a driving device, a sludge lifting pump and a sand sucking pipeline extending to the bottom of the tank are arranged on the main beam, and the sand sucking pipeline depends on the sludge lifting pump to finish the extraction of sand-water mixed liquid generated by aeration at the bottom of the tank. For example, a bridge sand sucker disclosed in CN202315450U, and an aerated grit chamber integrated with sand and slag removal and oil removal disclosed in CN205527818U are similar in structure.

The existing structure mode has the following defects: 1 the existing coarse filtration format and fine filtration grating are common gratings, the filtration effect is limited, and if the existing coarse filtration format and fine filtration grating are to be replaced by a membrane grating with better filtration effect, the membrane grating is easily polluted by the disturbed sludge of the aeration grit chamber, so that the effect is lost quickly. 2 the sludge lift pump is impacted by the muddy sand mixed in the sand suction pipeline for a long time, is easy to block and damage, and can influence the normal flow of water treatment and improve the maintenance cost of equipment by frequent maintenance. 3 the sedimentation tank is convenient for the upper bridge type sand sucker to walk, the sealing cover cannot be realized, the odor of the sewage in the sedimentation tank is easy to volatilize and disperse, the air environment pollution is caused, and the sanitation of the operating environment of workers is poor. 4 current water treatment grit chamber owing to need cooperate bridge type sand sucker walking to inhale sand, so the upper end top is uncovered setting usually, can cause sewage foul smell to volatilize, influences sanitation.

SUMMERY OF THE UTILITY MODEL

To the not enough of above-mentioned prior art, the utility model discloses the technical problem who solves first of all is: how to provide a top structure of a water inlet grit chamber, which can better avoid the volatilization of sewage odor and improve the environmental sanitation.

In order to solve the technical problem, the utility model adopts the following technical scheme.

A top structure of a water inlet grit chamber is characterized in that a track for arranging a bridge type sand sucker is arranged on the top of the upper end of the grit chamber along the length direction; the sand setting tank is internally provided with a sand setting groove in the middle, the left side and the right side of the sand setting groove are provided with scum grooves, the outside of the scum groove on one side of the sand setting tank extends outwards and is provided with a sand discharge groove in a suspension manner, the sand setting tank and/or the scum grooves and/or the sand discharge groove are/is provided with a movable sealing structure at the upper end notch position, and the middle position of the movable sealing structure is provided with an elastic opening for the vertical component of the bridge type sand sucker to be inserted and movably matched.

Like this, can realize better sealing to the grit chamber upper end, avoid sewage to stop the fermentation after the stink volatilizees the diffusion and the polluted air environment, do not influence the seesaw effect that need stretch into the intraoral vertical member of cell simultaneously.

Furthermore, the movable sealing structure comprises two elastic plates which are arranged in a covering mode along the front and back direction, the outer sides of the two elastic plates are relatively fixed on groove walls on two sides of the groove opening, and the inner sides of the two elastic plates are overlapped and form the elastic opening.

Therefore, the elastic plate can be used for inserting the vertical component and fit around the vertical component as much as possible to realize sealing by means of the elasticity of the elastic plate, the structure is simple, and the elastic opening can be conveniently formed.

Further, the elastic plate is made of a rubber sheet material. Low cost and sufficient elasticity.

Furthermore, a fixing plate is fixedly arranged on the groove walls on the two sides of the notch, and the inner side of the fixing plate is fixed with the elastic plate. Like this, can realize better supporting and connecting the elastic plate, avoid the elastic plate width too big and lose elasticity supporting effect.

Further, the fixed plate is made of sheet metal materials. The cost is low, and the processing and the installation are easy.

Furthermore, the outer side of the fixing plate is provided with a fixing flange which is vertically turned upwards, the fixing flange is fixed on the groove wall through a screw, the inner side of the fixing plate is provided with an upward inclined connecting edge, and the outer side of the elastic plate is fixed on the connecting edge through a screw.

Therefore, the fixing device has the advantages of simple structure and reliable fixation. Meanwhile, the connecting edge which is inclined upwards can enable the elastic plate to be in an inner side inclined upwards state after being installed, so that the inner side edge of the elastic plate can be better kept in contact with the vertical component, and gaps are reduced.

Furthermore, the fixed plate is provided with reinforcing ribs protruding upwards and extending along the width direction at intervals along the length direction of the grit chamber. Therefore, the self-supporting strength of the fixing plate can be better improved.

Furthermore, an observation window capable of being opened is further formed in the fixing plate.

Like this, can conveniently open the observation window and observe the below sewage treatment condition.

Furthermore, the fixed plate at the end part of the length direction of the sedimentation tank is also provided with an air draft hole, the air draft hole is connected to an aeration pipe network of the biochemical aeration tank through an air draft pipeline, and the air draft pipeline is provided with an exhaust fan.

Therefore, air above the sedimentation tank can be pumped out by the air pumping pipeline, certain negative pressure is formed in the sedimentation tank, air pollution caused by overflowing of volatile odor from the elastic plate gap is avoided, and environmental sanitation is further improved. Meanwhile, the extracted odor is connected to an aeration pipe network of the biochemical aeration tank for aeration treatment, thereby realizing the utilization of waste gas and avoiding the pollution of the atmospheric environment by the direct discharge of the odor.

Furthermore, a cable follow-up device is further arranged at the top of the upper end of the grit chamber and comprises a long-strip-shaped cable guide rail, the cable guide rail is mounted above the edge of one side of the width direction of the grit chamber in a suspension mode through a cable support frame, a plurality of cable clamps are mounted on the cable guide rail in a sliding fit mode, and cables connected out of an electric cabinet of the bridge type sand sucker are sequentially and fixedly connected to the cable clamps and then externally connected with a power grid from the end part of the grit chamber.

Like this, after having set up cable servo-device, when bridge type sand sucker's organism moved on the track and inhale sand, the cable can rely on the cable to press from both sides the slip on the cable guide rail, realizes with the follow-up of organism, has guaranteed the stable power supply to the electric cabinet, has guaranteed the stability of control better.

Furthermore, the end part of the handrail on the bridge type sand sucker extends outwards to form a cable connecting rod, the cable connecting rod is connected with a cable clamp at the end part of the cable guide rail, and a cable connected out of an electric cabinet of the bridge type sand sucker is connected out of the cable clamp along the lower part of the cable connecting rod.

Like this, when can guaranteeing the organism walking better, can drive the cable clamp through the cable connecting rod and follow the removal, avoid the cable to receive the pulling force and damage.

Furthermore, the cable support frame is in an inverted L shape, the outer end of the upper end transverse support arm is fixed to the upper surface of the cable guide rail, the lower end of the cable guide rail is opened inwards, the opening is enlarged towards two sides to form a sliding matching surface, and the upper end of the cable clamp is hung on the sliding matching surface in the opening in a sliding matching mode through the pulley.

Like this, adopt the structural style of unsettled articulate, more conveniently avoid the cable to receive interference and collision at the follow-up in-process, guarantee automatically controlled stability.

Preferably, the cable clamp comprises an upper clamping piece, a lower clamping piece is arranged below the upper clamping piece at intervals, the cable is clamped between the upper clamping piece and the lower clamping piece, the two ends of the lower clamping piece in the length direction of the cable are bent downwards to form an arc shape, and the middle part of the upper surface of the upper clamping piece is connected with a pulley matched on a cable guide rail through a vertical hanging and connecting rod.

Like this, make things convenient for the cable clamp to fix the centre gripping of cable, the arc structure of clamping piece down simultaneously can guide the cable between two cable clamps better and drag down and be the arc, plays the effect of protection cable for at cable follow-up in-process, the cable between two cable clamps falls or all can not harm the cable when flare-outing.

Further, the upper clamping piece and the lower clamping piece are fixedly connected through a vertically arranged bolt.

Like this, can conveniently go up the elasticity between clamping piece and the lower clamping piece through the regulation of bolt, and then conveniently adjust the cable length size between two adjacent cable clamps.

Further, the lower clip is made of elastic material. This can improve the cable protection effect even better. In specific implementation, the lower clamping piece can be made of rubber materials.

Furthermore, the middle part of the cable support frame is also fixed with a long rod arranged along the length direction of the grit chamber, and forms a peripheral rail of the grit chamber.

Like this, utilized the cable support frame to form the railing, saved the component and can guarantee grit chamber top safety better.

In conclusion, the utility model can better avoid the volatilization of sewage odor and improve the environmental sanitation; meanwhile, the travelling sand suction of the sand suction machine is facilitated, and the cable protection effect, the sanitation and the like are good.

Drawings

FIG. 1 is a schematic view of a sewage treatment system using the present invention.

Fig. 2 is a sectional view of the structure of a separate settling tank of fig. 1.

Fig. 3 is an enlarged view of a portion of the individual cable follower of fig. 2.

Fig. 4 is a side view of fig. 3.

FIG. 5 is a schematic plan view of the position of the single dynamic seal arrangement of FIG. 2.

Detailed Description

The present invention will be described in further detail with reference to a sewage treatment system using the present invention and its accompanying drawings.

The specific implementation mode is as follows: as shown in fig. 1 to 5, a sewage inflow treatment system includes a coarse filter grid and a fine filter grid disposed at a sewage inflow position of a sewage plant, and a grit chamber 1 disposed therebetween; wherein be provided with bridge type sand sucker on grit chamber 1, wherein, the smart grid of filtering is the membrane grid, install the air stripping device on the bridge type sand sucker.

Like this, after the fine filtration grid adopted the membrane grid, can greatly improve the filter effect of intaking to sewage, slow down follow-up sewage treatment burden. Meanwhile, the treatment mode that the aeration device is adopted in the grit chamber for aeration and then the sludge lifting pump is used for extracting and sucking sand is replaced by the mode that the air lifting device is directly used for sucking sand, so that the disturbance of the sand during sludge cleaning (sand filling) is greatly reduced, and the defect that the sand driven by aeration enters a subsequent membrane grid to cause blockage quickly is avoided. Therefore, the long-term smooth operation of the membrane grating is ensured, and the primary filtering effect and efficiency of the sewage are ensured.

The coarse filtering grating comprises a first-level coarse filtering grating and a second-level coarse filtering grating which are sequentially installed forwards at intervals along the water flow direction, and the aperture of the second-level coarse filtering grating is smaller than that of the first-level coarse filtering grating.

Like this, through the coarse filtration processing of two-stage, can intercept aquatic major diameter floater and suspended solid better, avoid causing the influence to follow-up membrane grid.

Wherein, the aperture of the first-stage coarse filtration grating is 10mm, the aperture of the second-stage coarse filtration grating is 3mm, and the aperture of the membrane grating is 1 mm.

Like this, can guarantee better filtering effect step by step, slow down follow-up sewage treatment burden. During specific implementation, the primary coarse filtering grid and the secondary coarse filtering grid are realized by rotary type grid dirt removing machines, and the membrane grid is realized by an internal inflow type grid dirt removing machine. Thus, the filtering effect can be better ensured. In fig. 1, reference numeral 2 denotes a rotary type grill cleaner in which a primary coarse filter grill is installed, reference numeral 3 denotes a rotary type grill cleaner in which a secondary coarse filter grill is installed, and reference numeral 4 denotes an internal inflow type grill cleaner in which a membrane grill is installed.

The bridge type sand sucker is shown in figure 2 and comprises a main beam 5 transversely erected above a grit chamber 1 to serve as a machine body, wherein the lower parts of two ends of the main beam 5 can be matched on a track arranged at the upper end of the grit chamber along the length direction in a rolling mode through rollers 6, an air lifting device comprises a sand conveying pipe 7 arranged on the main beam, a sand lifting pipe 8 extending towards the lower part in the grit chamber is communicated with the sand conveying pipe 7, the lower port of the sand lifting pipe is located at the position close to the lowest position of the bottom of the grit chamber and forms a sand sucking port, and one end of the sand conveying pipe 7 extends towards the end part of the main beam to a sand discharge groove at the side edge of the grit chamber and bends downwards to enter the sand discharge groove; still be provided with trachea 9 on the girder, be provided with air pump 10 on the trachea 9, the intercommunication is provided with and carries the air stripping pipe 11 of sand pipe parallel downwardly extending on the trachea 9, and the intercommunication of air stripping pipe 11 lower extreme is fixed on the sand stripping pipe 8 of one section position above the sand suction mouth.

Like this, set up the air pump on the trachea as the air supply, through the downward air feed of air stripping pipe, air stripping pipe inserts the air current to sand stripping pipe lower part and upwards flow, drives sand suction opening of sand stripping pipe lower extreme and upwards inhales sand, accomplishes the absorption of grit bottom sand setting tank bottom silt particle and handles, and the suction silt particle is discharged through defeated sand pipe and is handled in the sand discharge groove. Therefore, the structure is simple, the disturbance effect on the sand is small, and the blockage caused by the fact that the deposited sand enters the subsequent membrane grating is avoided. Meanwhile, a sludge pump is not arranged in the sand extraction pipeline, so that smoothness of pipeline conveying can be better ensured, and the silt conveying efficiency is improved.

Wherein, the lower end of the sand stripping pipe is provided with an upward check valve (not shown in the figure) below the joint of the air stripping pipe.

Like this, can guarantee that the air current that the air stripping pipe got into the sand stripping pipe can upwards move better when the device starts and with rivers jack-up to discharging to the sand discharge groove.

Wherein, the air pipe 9 is also communicated with an air blowing pipe 12 which is parallel to the sand extracting pipe 8 and extends downwards, and a downward air blowing opening which is parallel to the sand sucking opening is formed at the lower end of the air blowing pipe 12.

Like this, when the sediment of grit chamber below silt particle deposit is thicker or tighter, lean on air stripping pipe and sand stripping pipe suction alone and can't suck away the silt particle, can rely on the gas blow pipe to blow downwards, break away or wash up sedimentary silt particle, make it better taken away by sand stripping pipe suction, improve the desanding effect.

Wherein, the part of the air blowing pipe 12 positioned on the machine body is also provided with a control valve (not shown in the figure).

Therefore, the on-off of the air blowing pipe can be conveniently and better controlled, and the air blowing quantity can be flexibly adjusted according to the requirement.

Wherein, the lower end of the sand extracting pipe 8 is also provided with a fixed block 13 near the sand sucking port, and the lower part of the sand extracting pipe 8, the lower part of the air blowing pipe 12, the lower end of the air extracting pipe 11 and the communicating part of the sand extracting pipe are all fixed on the fixed block 13.

Like this, can rely on the fixed block to strengthen the structural strength of this position, improve device job stabilization nature and life.

The main beam is provided with a sand lifting pipe, wherein the position of the sand lifting pipe below the main beam is also fixedly provided with a long-strip-shaped hanging bracket 14 extending vertically downwards, the main body parts of the sand lifting pipe, the air lifting pipe and the air blowing pipe are positioned in the hanging bracket 14 and fixedly connected with the hanging bracket 14, and the lower ends of the sand lifting pipe, the air lifting pipe and the air blowing pipe penetrate out of the hanging bracket downwards.

Therefore, the stability and the reliability of the structure can be better ensured, and the service life of the device is prolonged.

Wherein, a walking motor 15 is arranged on one side of the middle part of the main beam, two transmission rods 16 arranged along the length direction of the main beam are respectively connected on two sides of the output end of the walking motor 15 in a transmission way, and the outer ends of the transmission rods 16 are respectively connected with the rollers 6 at two ends of the main beam in a transmission way.

Therefore, the walking control of the bridge type sand sucker is realized, and the bridge type sand sucker has the characteristics of simple structure and stable and reliable walking control.

Wherein, girder 5 wholly is the horizontal plate form, and girder width direction both sides respectively are provided with one row of handrail 17, and one side middle part still is provided with electric cabinet 18, and electric cabinet 18 and air pump and walking motor control are connected.

Like this, can make things convenient for the staff to walk on the girder to realize electrical control through controlling the electric cabinet.

Wherein, the main girder 5 is located outside the sand lifting pipe below and is provided with a downward scraper fixing rod 19 near the end, a scum scraper 20 transversely arranged is installed below the scraper fixing rod 19, the scum scraper 20 is located in a scum groove 21 at the side of the grit chamber, and the lower part of the scum scraper is submerged in the scum groove water surface.

Therefore, when the main beam walks to suck sand, the scraper can be driven to scrape the scum overflowing into the scum groove to the end part of the scum groove for centralized treatment.

The sand basin comprises a sand basin 1, a sand basin body, a bridge type sand sucker, a cable follow-up device (see fig. 3-4), a cable support frame 23, a cable guide rail 22, a plurality of cable clamps, a cable 24 and a cable guide rail 22, wherein the cable follow-up device (see fig. 3-4) is further arranged and comprises a strip-shaped cable guide rail 22, the cable guide rail 22 is installed above the edge of one side in the width direction of the sand basin body in a suspended mode through the cable support frame 23, the cable clamps are slidably installed on the.

Wherein, handrail tip outwards extends on the organism and is provided with a cable junction pole 25, and cable junction pole 25 links to each other with a cable clamp of cable guide 22 tip, and the cable 24 that connects out from bridge type sand sucker's electric cabinet connects out to the cable clamp along cable junction pole 25 below.

The cable support frame 23 is in an inverted L shape, the outer end of the upper end transverse support arm is fixed to the upper surface of the cable guide rail 22, the lower end of the cable guide rail 22 is opened inwards, the opening is enlarged towards two sides to form a sliding matching surface, and the upper end of the cable clamp is hung on the sliding matching surface in the opening in a sliding matching mode through a pulley.

Wherein, the cable clamp includes an upper clamping piece 26, and upper clamping piece 26 below interval is provided with a lower clamping piece 27, and cable 24 centre gripping is between upper clamping piece 26 and lower clamping piece 27, and lower clamping piece 27 is the arc along cable length direction's both ends downwarping, and upper surface middle part is connected through vertical head rod and the pulley of cooperation on the cable guide rail.

Wherein, the upper clamping piece 26 and the lower clamping piece 27 are fixedly connected through a vertically arranged bolt.

Wherein, the lower clip 27 is made of elastic material. This can improve the cable protection effect even better. In specific implementation, the lower clamping piece can be made of rubber materials.

Wherein, the middle part of the cable support frame 23 is also fixed with a long rod 28 arranged along the length direction of the grit chamber and forms a peripheral rail of the grit chamber.

The whole body of the grit chamber 1 protrudes from the ground, a grit chamber 29 (two grit chambers are arranged in parallel in this embodiment) is arranged in the middle of the grit chamber 1, the front end and the rear end of the grit chamber 29 are connected with a sewage channel, scum grooves 21 are arranged on the left side and the right side of the grit chamber 29, an overflow gap (not shown in the figure) for scum to overflow is arranged on the upper surface of a partition wall between the grit chamber 29 and the scum grooves 21, an independent scum funnel 30 is arranged at the end part of the scum groove 21 along the length direction of the grit chamber, and the lower end of the scum funnel 30 is externally connected to the outside of the grit chamber 1 through a scum pipeline 31; the outside of the scum groove on one side of the grit chamber is also extended outwards and suspended with a sand discharge groove 32, and the lowest part of the lower end of the sand discharge groove 32 is connected with a sand-water separator 34 through a sand discharge pipeline 33.

Like this, the grit chamber sets up in ground top, can avoid excavating the earthwork, reduces equipment cost. The scum groove that sets up can make things convenient for the scum on grit chamber surface to spill over and centralized processing. When the bridge type sand sucker travels to suck sand, the scum scraper on the bridge type sand sucker scrapes scum in the scum groove to a scum funnel and discharges the scum funnel. Meanwhile, the sand discharge groove arranged at the edge of the tank body can concentrate the mud and sand sucked out by the bridge type sand sucker and realize sand-water separation by discharging the mud and sand to a sand-water separator below the ground through self-weight flow. So this grit chamber structure can reduce cost better, can realize handling respectively of silt particle and dross, and the overall function is better, and is favorable to realizing the dehydration treatment to bridge type sand sucker absorption silt particle more.

Wherein, the notch position of the upper end of the grit chamber 29 and/or the scum groove 21 and/or the sand discharge groove 32 is provided with a dynamic sealing structure (in the embodiment, each notch position is provided with a dynamic sealing structure), and the middle position of the dynamic sealing structure is provided with an elastic opening for inserting and movably matching the vertical component.

The dynamic sealing structure (see fig. 5) includes two elastic plates 35 covering in the front-back direction, the outer sides of the two elastic plates 35 are relatively fixed to the groove walls 36 on the two sides of the notch, and the inner sides of the two elastic plates 35 are overlapped to form the elastic opening.

Wherein, the elastic plate 35 is made of a rubber sheet material. Low cost and sufficient elasticity.

Wherein, a fixing plate 37 is fixedly arranged on the groove wall 36 at two sides of the notch, and the inner side of the fixing plate 37 is fixed with the elastic plate 35. Like this, can realize better supporting and connecting the elastic plate, avoid the elastic plate width too big and lose elasticity supporting effect.

Wherein, the fixing plate 37 is made of sheet metal material. The cost is low, and the processing and the installation are easy.

The outer side of the fixing plate 37 is provided with a fixing flange 38 which is vertically turned upwards, the fixing flange 38 is fixed on the groove wall 36 through a screw, the inner side of the fixing plate 37 is provided with an upward inclined connecting edge 39, and the outer side of the elastic plate 35 is fixed on the connecting edge 39 through a screw.

Wherein, the fixed plate 37 is provided with reinforcing ribs 40 protruding upwards and extending along the width direction at intervals along the length direction of the grit chamber. Therefore, the self-supporting strength of the fixing plate can be better improved.

The fixed plate 37 is further provided with an openable observation window 41.

Wherein, the fixed plate at the end part of the sedimentation tank 1 in the length direction is also provided with an air draft hole, the air draft hole is connected to an aeration pipe network of the biochemical aeration tank through an air draft pipeline 42, and the air draft pipeline is provided with an exhaust fan (not shown in the figure).

Claims

1. A top structure of a water inlet grit chamber is characterized in that a track for arranging a bridge type sand sucker is arranged on the top of the upper end of the grit chamber along the length direction; the sand setting tank is internally provided with a sand setting groove in the middle, the left side and the right side of the sand setting groove are provided with scum grooves, the outside of the scum groove on one side of the sand setting tank extends outwards and is provided with a sand discharge groove in a suspension manner, the sand setting tank and/or the scum grooves and/or the sand discharge groove are/is provided with a movable sealing structure at the upper end notch position, and the middle position of the movable sealing structure is provided with an elastic opening for the vertical component of the bridge type sand sucker to be inserted and movably matched.

2. The top structure of a water-intake grit chamber as claimed in claim 1, wherein said dynamic seal structure comprises two elastic plates which are arranged in a covering manner in the front-rear direction, the outer sides of the two elastic plates are relatively fixed to the groove walls at both sides of the groove opening, and the inner sides of the two elastic plates are overlapped and form said elastic opening.

3. The structure of the top of a water-intake grit chamber as in claim 2, wherein the elastic plate is made of a rubber sheet material.

4. The top structure of a water-intake grit chamber as claimed in claim 2, wherein a fixing plate is further fixedly provided on the walls of the groove on both sides of the notch, and the inner side of the fixing plate is fixed to the elastic plate.

5. The structure of the top of a water-intake grit chamber as in claim 4, wherein the fixing plate is made of a sheet metal material.

6. The top structure of a water-intake grit chamber as claimed in claim 4, wherein the fixing plate has a fixing flange vertically turned upward on the outside, the fixing flange is fixed to the wall of the tank by means of a screw, the fixing plate has an upwardly inclined connecting edge on the inside, and the elastic plate is fixed to the connecting edge on the outside by means of a screw.

7. The top structure of a water-intake grit chamber as claimed in claim 4, wherein the fixing plate is provided with reinforcing ribs which are upwardly protruded and extended in the width direction at intervals in the length direction of the grit chamber.

8. The top structure of a water-intake grit chamber as in claim 4, wherein the fixed plate is further provided with an openable observation window.

9. The top structure of a water-intake grit chamber as in claim 4, wherein the fixing plate at the end of the sedimentation tank in the length direction is further provided with an air suction hole, the air suction hole is connected to an aeration pipe network of the biochemical aeration tank through an air suction pipe, and the air suction pipe is provided with an exhaust fan.

10. The top structure of the water-intake grit chamber as claimed in claim 1, wherein the top of the upper end of the grit chamber is further provided with a cable follower, the cable follower comprises a strip-shaped cable guide rail, the cable guide rail is suspended above the edge of one side of the grit chamber in the width direction through a cable support frame, the cable guide rail is slidably fitted with a plurality of cable clamps, and a cable connected out of an electric cabinet of the bridge sand sucker is sequentially and fixedly connected to each cable clamp and is externally connected with an electric network from the end of the grit chamber;

the cable support frame is in an inverted L shape, the outer end of the transverse support arm at the upper end of the cable support frame is fixed with the upper surface of the cable guide rail, the lower end of the cable guide rail is inwards opened and is expanded towards two sides in the opening to form a sliding matching surface, and the upper end of the cable clamp is hung on the sliding matching surface in the opening in a sliding matching manner by virtue of a pulley;

the cable clamp comprises an upper clamping piece, lower clamping pieces are arranged below the upper clamping piece at intervals, a cable is clamped between the upper clamping piece and the lower clamping pieces, the lower clamping pieces are bent downwards along the two ends of the cable in the length direction to form an arc shape, and the middle part of the upper surface of the upper clamping piece is connected with a pulley matched on a cable guide rail through a vertical hanging rod.