CN114477485B

CN114477485B - Sewage river sediment removal device

Info

Publication number: CN114477485B
Application number: CN202210206404.0A
Authority: CN
Inventors: 封硕; 窦波
Original assignee: Jiangsu Doubleana Industrial Technology Co ltd
Current assignee: Jiangsu Doubleana Industrial Technology Co ltd
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2023-01-03
Anticipated expiration: 2042-03-04
Also published as: CN114477485A

Abstract

The invention relates to the technical field of sewage treatment and discloses a sewage river channel dredging device which comprises a vent pipe, wherein a clamping bag is fixedly installed at the top end of the vent pipe, a first diaphragm is fixedly installed in the middle of the top end of the vent pipe, and a first air hole is formed in the surface of the first diaphragm. The invention effectively avoids the problem that the microporous membrane is easily separated from the gland because the existing gland device cannot reinforce the microporous membrane, effectively avoids the problem that the outlet efficiency of the microporous membrane is low because part of orifices of the existing microporous membrane cannot be normally opened by arranging the first air hole and the second air hole, effectively separates external sewage and internal air by arranging the oil storage layer, the oil conveying pipe and the movable bag, avoids pipeline pollution and influences the normal use of the vent pipe, and also effectively avoids the blockage of impurities in the sewage on the vent hole and adverse effects on aeration through the oil film separation.

Description

Sewage river sediment removal device

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a sewage river channel dredging device.

Background

The long-term accumulation of river silt can influence works such as flood control, waterlogging drainage, irrigation of the river course, therefore the river course needs to carry out timely silt clearance, wherein, in the desilting process, carry out aeration and oxygenation to the sewage containing area mud, be the important step of comparatively key, and the aeration and oxygenation of current realization generally adopts the aerator, the aerator is one kind and carries out aeration and oxygenation's essential equipment for discharging sewage, it mainly comprises gas distribution pipe, blow vent, micropore diaphragm, gland, rubber ring, support plate, etc. structure, through the air pump, pump air into the gas distribution pipe, through the gas distribution pipe, send into the air vent of each aerator of even air, through the top-rushing of gas, thereby make the micropore on the micropore diaphragm surface at top open, the air outwards discharges through the micropore, thereby carry out the intensive mixing with sewage, dissolve the oxygen in the air in the aquatic, make the oxygen in the air, activated sludge and pollutant intensive mixing, make activated sludge be in suspension state, impel oxygen to move from the aqueous phase to the liquid phase, transfer to activated sludge from the liquid phase, guarantee that the microorganism has enough oxygen to clear up, thereby the purpose of the metabolism is reached.

Present aerator is when using, the existence is very fast because of the gas flow speed, its impact force that gives the micropore diaphragm is great, and present fixed to the micropore diaphragm, generally adopt fixed rigidity type gland, carry out the centre gripping locking to the edge of diaphragm, but if the aeration rate is too big, the gas volume that upwards gushes is great, impact to the bottom of micropore diaphragm that the impact force is concentrated, cause micropore diaphragm and gland to take place to break away from easily, and then lead to the unable use of aerator, the unable problem that goes on of desilting work, furthermore, present micropore diaphragm generally adopts elastic rubber, utilize diaphragm self characteristic and make the micropore atress open, but it is opening the in-process, the existence leads to the spring degree difference because of the atress is different, then the micropore has the unable normal open in some drill way, thereby lead to the micropore diaphragm efficiency of giving vent to anger not high, be unfavorable for the high efficiency of desilting work to go on.

Disclosure of Invention

Aiming at the defects of the conventional sewage river channel dredging device in the background technology in the using process, the invention provides the sewage river channel dredging device which has the advantages of automatically adjusting the fixing tightness of a diaphragm according to the air pressure degree, ensuring the air outlet efficiency fully without opening micropores and solving the technical problems in the background technology.

The invention provides the following technical scheme: the utility model provides a sewage river sediment removal device, includes the breather pipe, the top fixed mounting of breather pipe has the clamp to press the bag, the top middle part fixed mounting of breather pipe has first diaphragm, first gas pocket has been seted up on the surface of first diaphragm, the outside bottom fixed mounting of first diaphragm has the bottom plate, the top fixed mounting of bottom plate has the oil reservoir that is located the outside of first diaphragm, the top fixed mounting of oil reservoir has defeated oil pipe, defeated oil pipe's top fixed mounting has movable bag, one side fixed mounting of activity bag has the gas bag, one side fixed mounting of gas bag has the support movable groove that is located the outside edge of first diaphragm, the inside movable mounting who supports movable groove has the second diaphragm, the second gas pocket has been seted up on the surface of second diaphragm, the top outside fixed mounting of second gas pocket has the upper fixed plate.

Preferably, the lower end of the clamping and pressing bag is conical, the upper end of the clamping and pressing bag is cylindrical, the lower end pipe body of the clamping and pressing bag is inclined, the opening of the lower end pipe body is communicated with the inside of the vent pipe, one side of the inner side of the upper portion of the clamping and pressing bag is connected with one end of the lower fixing plate, the other side of the inner side of the upper portion of the clamping and pressing bag is connected with one end of the upper fixing plate, and the three parts are combined to enable the inner cavity of the upper portion of the clamping and pressing bag to be a C-shaped channel.

Preferably, the shape of the opening of the first air hole is cylindrical, the first air hole is uniformly distributed in the first membrane, the shape of the opening of the second air hole is also cylindrical, the positions of the openings of the first air hole and the second air hole are regularly distributed in a staggered manner, the first membrane and the second membrane are rigid plates, and small holes are formed in the surface of the first air hole.

Preferably, the oil reservoir is eight in total, and evenly distributed is at the top surface of bottom plate, the shape of oil reservoir is rectangle, and its inside is cavity, the inside of first diaphragm is also cavity form, and its outside edge links to each other with the inboard one end of oil reservoir, and both links up each other the department of meeting, the inside of oil reservoir is full of fluid.

Preferably, defeated oil pipe's shape is cylindrical, and defeated oil pipe's one end opening stretches into the inside of oil reservoir to be linked together with the inside of oil reservoir, defeated oil pipe's the other end is linked together with the bottom of activity bag.

Preferably, the movable bag and the inflatable bag are both rectangular and hollow, and the bottom of the inner side of the inflatable bag is provided with a vent hole.

Preferably, the lower fixing plate and the upper fixing plate are both formed in a circular ring shape, are rigid, and have rough surfaces.

The invention has the following beneficial effects:

1. the invention provides a pressure-holding bag, a lower fixing plate and an upper fixing plate, wherein the pressure-holding bag is arranged, the pressure-holding bag is used for holding a first membrane and a second membrane in a C-shaped manner from top to bottom by introducing part of air which flows upwards in a vent pipe into the inner cavity of the pressure-holding bag to expand the inner cavity of the pressure-holding bag, the lower fixing plate and the upper fixing plate are fixed, the first membrane, the lower fixing plate and the upper fixing plate are tightly attached to each other by the pressure-holding bag, and when the gas flow in the vent pipe is large, the gas pressure caused by the gas in the pressure-holding bag on the lower fixing plate and the upper fixing plate is stronger, so that the static friction between the upper fixing plate and the second membrane is larger, the first membrane and the second membrane cannot be separated from the lower fixing plate and the upper fixing plate, and the problem that the existing pressure-holding device cannot be used for holding a pressure-holding cover all the membrane is solved, and when the amount of the membrane is too large, micropores cannot be effectively reinforced, and the micropores cannot be separated from the upper fixing plate, so that the aerator cannot be easily used.

2. The invention uses the air circulating in the vent pipe to impact the second membrane by arranging the first air hole and the second air hole, so that the second membrane moves upwards, the air quickly flows into the gap between the first membrane and the second membrane, meanwhile, part of the air flows into the inner cavity of the air bag to expand the air bag, the expanded air bag supports the bottom end of the second membrane, so that the second membrane and the first membrane are always kept in a separated state when aerating, when the second membrane moves upwards, a passage is formed between the first air hole and the second air hole, the air can pass through the first air hole and then is discharged outwards through the second air hole to be contacted with external sewage, thereby realizing the aeration oxygenation effect, but when the air inside the vent pipe stops supplying, then the air in the air bag inner chamber is outwards revealed, the inside atmospheric pressure of air bag reduces, retract downwards fast, and then drive the second diaphragm and reset downwards, make the second diaphragm merge together with first diaphragm again, because of first gas pocket and second gas pocket are crisscross each other, then when second diaphragm and first diaphragm merge from top to bottom, can't form the route between first gas pocket and the second gas pocket, thereby reach the effect of obturator, distribution through staggering of first gas pocket and second gas pocket, utilize the clearance to realize the switching, and then effectively avoid current micropore diaphragm at the opening in-process, the existence leads to the bullet degree difference because of the atress is different, thereby lead to the unable normal opening in partial drill way, cause micropore diaphragm air outlet efficiency, the problem that desilting work efficiency descends.

3. According to the invention, through arranging the oil storage layer, the oil delivery pipe and the movable bag, after air supply is stopped in the vent pipe, the second membrane moves downwards to further extrude the cavity of the movable bag, so that oil in the movable bag is rapidly extruded and flows back to the inner cavity of the oil storage layer and flows into the inner cavity of the first membrane in a large amount, and through the small holes formed in the surface of the first air hole, when the oil circulates, rapid jet flow is formed through the small holes and is intensively jetted to the inside of the first air hole, and due to the small aperture distance of the first air hole, a layer of oil film is formed on the surface of the first air hole in a converging manner of passing through the liquid tension of the oil, and due to the fact that the oil and the water cannot be mixed, sewage is blocked outside by the oil film layer, so that external sewage and internal air are effectively blocked, and when the second membrane is reset and closed downwards, the external sewage passes through the second air hole and enters the inner vent pipe through the first air hole to cause pipeline pollution and influence on normal use of the vent pipe, and simultaneously, through blocking of the oil film, the blockage caused by impurities in the sewage can be effectively avoided, and adverse effect on aeration is caused.

Drawings

FIG. 1 is a schematic sectional elevation view of the structure of the present invention;

FIG. 2 isbase:Sub>A schematic cross-sectional view taken along line A-A of FIG. 1 in accordance with the present invention;

FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1 in accordance with the present invention;

FIG. 4 is a schematic view of the structure of the present invention in an unventilated state.

In the figure: 1. a breather pipe; 2. clamping and pressing the bag; 3. a first diaphragm; 4. a first air hole; 5. a lower fixing plate; 6. an oil reservoir; 7. an oil delivery pipe; 8. a movable bag; 9. an air bag; 10. a movable supporting groove; 11. a second diaphragm; 12. a second air hole; 13. and an upper fixing plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 4, a sewage and river dredging device includes a vent pipe 1, a clamping bag 2 is fixedly installed at the top end of the vent pipe 1, a first membrane 3 is fixedly installed at the middle portion of the top end of the vent pipe 1, a first air hole 4 is formed in the surface of the first membrane 3, a lower fixing plate 5 is fixedly installed at the bottom end of the outer side of the first membrane 3, an oil storage layer 6 located at the outer side of the first membrane 3 is fixedly installed at the top end of the lower fixing plate 5, an oil delivery pipe 7 is fixedly installed at the top end of the oil storage layer 6, a movable bag 8 is fixedly installed at the top end of the oil delivery pipe 7, an inflatable bag 9 is fixedly installed at one side of the movable bag 8, a supporting movable groove 10 located at the outer side edge of the first membrane 3 is fixedly installed at one side of the inflatable bag 9, a second membrane 11 is movably installed inside the supporting movable groove 10, a second air hole 12 is formed in the surface of the second membrane 11, and an upper fixing plate 13 is fixedly installed at the outer side of the top end of the second air hole 12.

Referring to fig. 1 to 4, in which the lower end of the clamping bladder 2 is conical, the upper end thereof is cylindrical, the lower end of the clamping bladder 2 is inclined, the opening thereof is communicated with the interior of the vent pipe 1, one side of the inner side of the upper portion of the clamping bladder 2 is connected to one end of the lower fixing plate 5, and the other side thereof is connected to one end of the upper fixing plate 13, the three are combined to make the inner cavity of the upper portion of the clamping bladder 2 form a C-shaped passage, the clamping bladder 2 is configured with the clamping bladder 2, the lower fixing plate 5 and the upper fixing plate 13, so that the inner cavity of the clamping bladder 2 is expanded by air flowing through the vent pipe 1, due to the restriction of the lower fixing plate 5 and the upper fixing plate 13, the clamping bladder 2 is configured with a C-shaped passage for vertically clamping the first membrane 3 and the second membrane 11, and the bottom end of the first membrane 3 and the top end of the second membrane 11 are pressed by the air pressure, so that the first membrane 3 and the second membrane 11 are tightly attached to be unable to separate from each other, and the upper fixing plate 13 cannot be separated from each other, and the upper fixing plate 5 and the lower fixing plate 11 can not be used by the air pressure, and the aeration device can not be used for strengthening the first membrane, and the second membrane, and the aeration device, and the upper fixing device can not be used for strengthening the upper fixing plate 11.

Referring to fig. 1-2 and 3, wherein the first air holes 4 are cylindrical and uniformly distributed inside the first membrane 3, the second air holes 12 are cylindrical, the positions of the first air holes 4 and the second air holes 12 are regularly staggered with each other, both the first membrane 3 and the second membrane 11 are rigid plates, and the first air holes 4 and the second air holes 12 are arranged and distributed with each other in a staggered manner, so that air passing through the first air holes 4 through the air pipe 1 quickly flows into the space between the second membrane 11 and the first membrane 3, and part of the air flows into the inner cavity of the air bag 9 to expand the air bag, thereby supporting the bottom end of the second membrane 11, the aeration and oxygenation effects are realized by keeping the air and the first membrane 3 in a separated state, namely, the air can pass through the first air hole 4 and then is discharged outwards through the second air hole 12, so that the air can contact with external sewage, and when the air inside the air vent pipe 1 stops supplying, namely the air stops circulating, the air in the inner cavity of the air bag 9 is discharged outwards, the air bag 9 retracts downwards, the second membrane 11 is reset downwards and is combined with the first membrane 3 again, because the first air hole 4 and the second air hole 12 are mutually staggered, when the second membrane 11 and the first membrane 3 are combined together up and down, a passage cannot be formed between the first air hole 4 and the second air hole 12, so that the effect of closing the hole is achieved, the air inside the air vent pipe 1 cannot be discharged outwards, and the external sewage cannot flow inwards, and meanwhile, because both the first membrane 3 and the second membrane 11 are rigid plates, and first gas pocket 4 and second gas pocket 12 trompil are fixed, then when the air upwards gushes out, first diaphragm 3 and second diaphragm 11 can not take place the deformation, and both respective bottoms, because of first gas pocket 4 and second gas pocket 12 trompil size are fixed, then the air output is certain, thereby the atress on the bottom surface of first diaphragm 3 and second diaphragm 11 is even, and the gas volume of outside gas is even unanimous, and to opening of air vent, by second diaphragm 11 rebound, and form the route between first gas pocket 4 and the second gas pocket 12, thereby realize the aeration effect, consequently can not have the air vent and can't open, effectively avoided current micropore diaphragm in the opening process, exist because of the atress difference leads to the elasticity degree difference, thereby lead to partial drill way unable normal opening, cause the micropore diaphragm to give vent to anger the inefficiency, the problem of desilting work efficiency decline, the aperture is seted up on the surface of first gas pocket 4.

Referring to fig. 1, eight oil reservoirs 6 are uniformly distributed on the top surface of the bottom plate 5, the oil reservoirs 6 are rectangular and hollow, the first membrane 3 is also hollow and has an outer edge connected to one end of the inner side of the oil reservoir 6, the connection between the two is through, the oil reservoirs 6 are filled with oil, when the second membrane 11 is pushed open by air, the movable bag 8 is driven by the second membrane 11 to expand upwards, the inner cavity of the movable bag 8 is enlarged, so as to cause negative pressure adsorption to the inner cavity of the oil reservoirs 6, the oil within the oil reservoirs 6 is sucked into the inner cavity of the movable bag 8 through the oil delivery pipe 7, and the second membrane 11 moves downwards after the air supply inside the air pipe 1 stops, thereby squeezing the cavity of the movable bag 8, the oil inside the movable bag 8 is rapidly extruded and flows downwards, and passes through the oil pipeline 7, the oil rapidly flows back to the inner cavity of the oil storage layer 6 and flows into the inner cavity of the first diaphragm 3, because the surface of the first air hole 4 is provided with small holes, the oil passes through the small holes to form rapid jet flow, and simultaneously jets to the inside of the first air hole 4, because the aperture of the first air hole 4 is small, the rapidly and intensively sprayed oil is converged on the surface of the first air hole 4 to form a layer of oil film through the self-tension of the oil, and because the oil and the water cannot be mixed, the sewage is blocked by the oil film layer, so to sum up, the oil film effectively separates external sewage and internal air, and separates and breaks the gas and liquid, and when the second diaphragm 11 is reset and closed downwards, the external sewage passes through the second air hole 12 and enters the inside of the first air hole 4 to promote the sewage to flow into the inside of the vent pipe 1, and cause pipeline pollution, influence breather pipe 1's normal use, simultaneously, through the oil film separation, also effectively avoid the inside impurity of sewage to cause the jam to the air vent, cause harmful effects to the aeration.

Referring to fig. 1, the oil pipe 7 is cylindrical, and one end of the oil pipe 7 extends into the oil reservoir 6 and is connected to the inside of the oil reservoir 6, and the other end of the oil pipe 7 is connected to the bottom of the movable bag 8.

Referring to fig. 1, the movable bag 8 and the inflatable bag 9 are rectangular, and the interiors thereof are hollow, and the bottom of the inner side of the inflatable bag 9 is provided with a vent hole.

Referring to fig. 1-3, the lower fixing plate 5 and the upper fixing plate 13 are formed in a circular ring shape, and have rigidity and rough surfaces.

The using method of the invention has the following working principle:

when aeration and oxygenation are carried out, air is filled into the inner cavity of the air pipe 1 and continuously flows forwards through the existing air pump device, when the air flows to the top end of the air pipe 1, part of the air flows into the inner cavity of the clamping and pressing bag 2 through the bottom opening of the clamping and pressing bag 2, the clamping and pressing bag 2 starts to inflate and expand, after the clamping and pressing bag 2 is completely expanded, the inflated clamping and pressing bag 2 is C-shaped due to the fact that the positions of the lower fixing plate 5 and the upper fixing plate 13 are fixed, the first membrane 3 and the second membrane 11 are clamped up and down through the lower fixing plate 5 and the upper fixing plate 13, and the first membrane 3 and the second membrane 11 are fixed and cannot be separated easily.

Meanwhile, a large amount of air continues to flow upwards along the inner pipe diameter of the vent pipe 1, the air uniformly passes through the first air holes 4 on the surface of the first membrane 3 and impacts on the surface of the second membrane 11, so that the second membrane 11 is impacted, the second membrane 11 moves upwards, when the second membrane 11 is separated from the first membrane 3, the air rapidly flows into a gap between the second membrane 11 and the first membrane 3, part of the air flows into the inner cavity of the air bag 9 through the opening at the bottom of the air bag 9, so that the air bag 9 is expanded upwards, the distance between the second membrane 11 and the first membrane 3 is increased, until the air is separated to the top end of the supporting movable groove 10, and the air bag 9 cannot move upwards continuously, at the moment, the position of the second membrane 11 is fixed, the bottom end of the second membrane 11 is supported by the air bag 9, so that the second membrane 11 and the first membrane 3 are always kept in a separated state, a fixed passage is also formed between the first air holes 4 and the second air holes 12 are in contact with the outside air holes 12, so that the air can be oxygenated, and the sewage can be normally aerated.

When the air in the vent pipe 1 stops supplying, namely the air stops circulating, the air in the inner cavity of the air bag 9 is discharged outwards, the air bag 9 begins to shrink downwards, and then the second diaphragm 11 is driven to reset downwards, the second diaphragm 11 is merged with the first diaphragm 3 again, and because the first air holes 4 and the second air holes 12 are staggered, when the second diaphragm 11 and the first diaphragm 3 are merged together up and down, a passage cannot be formed between the first air holes 4 and the second air holes 12, so that the air in the vent pipe 1 cannot be discharged outwards, and the external sewage cannot flow inwards, thereby achieving the effect of closing the holes.

Meanwhile, after the air supply is stopped in the vent pipe 1, when the second diaphragm 11 moves downwards, the second diaphragm 11 extrudes the cavity of the movable bag 8, oil in the movable bag 8 is extruded to flow downwards, the oil rapidly flows back to the inner cavity of the oil storage layer 6 through the oil conveying pipe 7 and gradually flows into the inner cavity of the first diaphragm 3 through the oil storage layer 6, the oil is intensively and intensively ejected towards the inside of the first air hole 4 through the small holes formed in the surface of the first air hole 4, and sewage is blocked by the oil film layer due to the small aperture of the first air hole 4 and the tension of the oil, so that the sewage is prevented from permeating and polluting the air.

When aeration and oxygenation are carried out next time, the existing air pump device is restarted to supply air again.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a sewage river sediment removal device, includes breather pipe (1), its characterized in that: the top fixed mounting of breather pipe (1) has the pressure bag (2), the top middle part fixed mounting of breather pipe (1) has first diaphragm (3), first gas pocket (4) have been seted up on the surface of first diaphragm (3), the outside bottom fixed mounting of first diaphragm (3) has bottom plate (5), the top fixed mounting of bottom plate (5) has oil reservoir (6) that is located the outside of first diaphragm (3), the top fixed mounting of oil reservoir (6) has defeated oil pipe (7), the top fixed mounting of defeated oil pipe (7) has activity bag (8), one side fixed mounting of activity bag (8) has gas bag (9), one side fixed mounting of gas bag (9) has support activity groove (10) that is located the outside edge of first diaphragm (3), the inside movable mounting of support activity groove (10) has second diaphragm (11), second gas pocket (12) have been seted up on the surface of second diaphragm (11), the top outside fixed mounting of second gas pocket (12) has last fixed plate (13), the first gas pocket (4) is the even pore shape of first gas pocket (12), the pore shape of the second diaphragm (12) is also the trompil shape of the first pore and the trompil shape of the even distribution of the second pore (12), the first diaphragm (3) and the second diaphragm (11) are rigid plates, and small holes are formed in the surface of the first air hole (4).

2. The sewage river dredging device of claim 1, wherein: the lower end of the clamping and pressing bag (2) is conical, the upper end of the clamping and pressing bag (2) is cylindrical, the lower end pipe body of the clamping and pressing bag (2) is inclined, the opening of the lower end pipe body is communicated with the inside of the vent pipe (1), one side of the inner side of the upper portion of the clamping and pressing bag (2) is connected with one end of the lower fixing plate (5), the other side of the inner side of the upper portion of the clamping and pressing bag (2) is connected with one end of the upper fixing plate (13), and the combination of the three enables the inner cavity of the upper portion of the clamping and pressing bag (2) to be a C-shaped passage.

3. The sewage river channel dredging device of claim 1, wherein: the oil reservoir (6) is total eight, and evenly distributed is on the top surface of bottom plate (5), the shape of oil reservoir (6) is rectangle, and its inside is cavity, the inside of first diaphragm (3) also is the cavity form, and its outside edge links to each other with the inboard one end of oil reservoir (6), and both links to each other the department of locating to link up each other, the inside of oil reservoir (6) is full of fluid.

4. The sewage river channel dredging device of claim 1, wherein: defeated oil pipe (7) is cylindrical in shape, and the one end opening of defeated oil pipe (7) stretches into the inside of oil reservoir (6) to be linked together with the inside of oil reservoir (6), the other end and the bottom of activity bag (8) of defeated oil pipe (7) are linked together.

5. The sewage river dredging device of claim 1, wherein: the movable bag (8) and the inflatable bag (9) are rectangular and hollow, and the bottom of the inner side of the inflatable bag (9) is provided with a vent hole.

6. The sewage river channel dredging device of claim 1, wherein: the lower fixing plate (5) and the upper fixing plate (13) are both formed in a ring shape, are rigid and have rough surfaces.