CN218403753U

CN218403753U - Dissolved air flotation device for sewage treatment

Info

Publication number: CN218403753U
Application number: CN202222423591.6U
Authority: CN
Inventors: 田甜
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-09-14
Filing date: 2022-09-14
Publication date: 2023-01-31
Anticipated expiration: 2032-09-14

Abstract

The utility model discloses a dissolve gas air supporting device for sewage treatment, be the air supporting case that the opening set up including the top, the left side bottom fixedly connected with air feed mechanism of air supporting case, fixedly connected with mechanism of blowing between the both sides inner wall of air supporting case. The utility model discloses a screw thread actuating mechanism and scraper blade cooperate, can carry out the automation to the scum layer that produces in the air supporting incasement and scrape the clearance and collect, setting through water level detection touch-control mechanism and solenoid valve, can be when the sewage liquid level reduces, add sewage in the automatic to the air supporting incasement, make the scum layer contact with the scraper blade always, can effectually avoid causing the phenomenon that can not strike off because of scraper blade and scum layer contactless, improve and strike off scum layer stability, and the cooperation through liquid level monitoring mechanism and audible-visual annunciator, automatic alarm when scum layer is filled with in the collecting box reminds personnel, make things convenient for personnel in time to learn and clear up, reduce the phenomenon that the scum layer spilled over from the collecting box when untimely because of the clearance.

Description

Dissolved air flotation device for sewage treatment

Technical Field

The utility model relates to a dissolve gas air supporting equipment technical field, especially relate to a dissolve gas air supporting device for sewage treatment.

Background

The dissolved air flotation is an air flotation method in water treatment, which is to form highly dispersed micro bubbles in water, adhere hydrophobic solid or liquid particles in sewage to form a water-air-particle three-phase mixed system, form suspended matters after the particles adhere to the bubbles, the suspended matters float upwards with the density smaller than that of the water, and form a scum layer to be scraped;

traditional dissolved air flotation device is when clearing up the scum layer of suspension in the sewage, adopt a plurality of scrapers of conveyer belt cooperation to strike off and collect the collecting box more, along with striking off going on of operation, make the sewage liquid level reduce gradually, the contactless condition of scraper blade and scum layer can appear, when scum layer in the collecting box is collected in addition is full, cause the scum layer in the collecting box to spill over the phenomenon of pollution easily because of discovering untimely, synthesize the above-mentioned condition, therefore we have proposed a dissolved air flotation device for sewage treatment and have been used for solving above-mentioned problem.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a dissolved air flotation device for sewage treatment.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a dissolved air flotation device for sewage treatment comprises an air flotation tank with an opening at the top, an air supply mechanism is fixedly connected at the bottom of the left side of the air flotation tank, an air blowing mechanism is fixedly connected between the inner walls of the two sides of the air flotation tank, the right side of the air supply mechanism extends into the air flotation tank and is fixedly communicated with the left side of the air blowing mechanism, air can be blown into the air flotation tank by matching the air supply mechanism and the air blowing mechanism, a cover plate is fixedly connected at the top of the air flotation tank, an exhaust pipe is embedded at the top of the cover plate, the exhaust pipe is arranged to exhaust air in the air flotation tank, sewage is filled in the air flotation tank, a scraper is movably contacted on the liquid level of the sewage and is used for scraping off a generated scum layer, a thread drive guide mechanism is installed between the inner walls of the two sides of the air flotation tank, and is sleeved on the thread drive guide mechanism, the top of the right side of the air flotation tank is fixedly connected with a driving motor, the output shaft of which is fixedly connected with the thread driving guide mechanism, the thread driving guide mechanism is matched with the driving motor and used for driving the scraper to circularly move leftwards and rightwards, the bottom of the scraper is provided with a rectangular groove, a water level monitoring touch mechanism is arranged in the rectangular groove and used for monitoring the water level in the air flotation tank, the bottom of the right side of the air flotation tank is communicated and fixed with a solenoid valve which is electrically connected with the water level monitoring touch mechanism, the solenoid valve is connected with an external water supply pipeline and used for supplying water into the air flotation tank, the inner walls of the two sides of the air flotation tank are respectively provided with a discharge hole, the two sides of the air flotation tank are movably clamped with a collecting box which is respectively matched with the corresponding discharge holes, the collecting box is used for collecting scraped scum layers, the collecting box is provided with a liquid level monitoring mechanism, and the liquid level monitoring mechanism monitors the scum layer liquid level collected in the collecting box, the bottom fixedly connected with of collecting box and liquid level monitoring mechanism electric connection's audible-visual annunciator, liquid level monitoring mechanism and audible-visual annunciator electric connection's mode can in time control audible-visual annunciator and open when the liquid level is high in the collecting box and carry out audible-visual alarm.

Preferably, the air supply mechanism comprises a compressed air machine fixedly mounted at the bottom of the left side of the air flotation tank, a pressure pump is arranged on the left side of the compressed air machine, the exhaust end of the pressure pump is communicated with the air inlet end of the compressed air machine, the pressure pump is used for adding high-pressure air into the compressed air machine, the compressed air machine is used for compressing the introduced air, and the exhaust end of the compressed air machine extends into the air flotation tank.

Preferably, the blowing mechanism comprises a transverse pipe fixedly connected between the inner walls of the two sides of the air flotation tank, the right end of the transverse pipe is arranged to be a blocking mechanism, the left end of the transverse pipe is communicated and fixed with the right end of the exhaust end of the compressed air machine, and the top of the transverse pipe is communicated and fixed with a plurality of blowing heads.

Preferably, screw drive guiding mechanism includes the guide bar of fixed connection between the inner wall of air supporting box both sides, and the scraper blade slip cap is established on the guide bar, and the guide bar plays the effect of direction to the scraper blade, rotates between the inner wall of air supporting box both sides and installs reciprocal lead screw, and the scraper blade thread bush is established on reciprocal lead screw, and reciprocal lead screw and scraper blade threaded connection's mode can drive the reciprocal right and left movement of scraper blade in reciprocal lead screw pivoted, driving motor's output shaft left end and the right-hand member fixed connection of reciprocal lead screw.

Preferably, water level monitoring touch-control mechanism establishes the box that floats in the rectangular channel including the slip cap, and fixedly connected with sliding connection touches the briquetting in floating the box on the right side inner wall of rectangular channel, floats the first switch that dabs of equal fixedly connected with on the top inner wall of box and the top inner wall of rectangular channel, and the first switch that dabs that is located the top cooperatees with the top that floats the box, and the first switch that dabs that is located the below cooperatees with the top that touches the briquetting, and two first dabs the switch all with solenoid valve electric connection.

Preferably, liquid level monitoring mechanism is including setting up the floater in the collecting box, the top fixedly connected with connecting rod of floater, the top of connecting rod extends to the top and the fixedly connected with L shape pole of the collecting box that corresponds, first groove has all been seted up to one side that two collecting boxes kept away from each other, the fixedly connected with locating lever between the top inner wall in first groove and the bottom inner wall, equal fixedly connected with locating piece on the one side inner wall that two L shape poles kept away from each other, locating piece sliding sleeve establishes on the locating lever that corresponds, the locating piece cooperatees with the locating lever, play the effect of direction to the L shape pole that corresponds, the switch is lightly touched to fixedly connected with second on the top inner wall in first groove, the locating piece is located the below that the second that corresponds lightly touched the switch and slightly touches the switch with the second and cooperatees, the switch is lightly touched to the second and the audible-visual annunciator electric connection that corresponds.

Preferably, the equal fixedly connected with backup pad in both sides of air supporting box, the top fixedly connected with kelly of backup pad, the draw-in groove has been seted up to the bottom of collecting box, the outer slidable suit of the inner wall of draw-in groove and the kelly that corresponds, the top of backup pad and the bottom movable contact of the collecting box that corresponds, backup pad and kelly cooperate for it is spacing to support the collecting box that corresponds.

Preferably, the bottom of the air flotation tank is communicated with and fixed with a drain valve, supporting blocks are fixedly connected to two sides of the bottom of the air flotation tank, the drain valve is located between the two supporting blocks, and the supporting blocks are used for supporting the air flotation tank.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the air supply mechanism is matched with the air blowing mechanism, so that air can be blown into the air flotation tank, highly dispersed micro bubbles are formed in water, the small bubbles are used for adhering hydrophobic solid or liquid particles in sewage to form a water-air-particle three-phase mixed system, and suspended matters are formed after the particles are adhered to the bubbles and float on the water surface;

2. the floating scum layer can be automatically scraped, cleaned and collected through the matching of the scraping plate, the thread driving mechanism, the driving motor and the collecting box;

3. through the cooperation of the water level monitoring touch mechanism and the electromagnetic valve, when the liquid level in the air flotation tank is reduced and is separated from the scraper, the electromagnetic valve is automatically controlled to open to add sewage into the air flotation tank, so that the scum layer can be always contacted with the scraper, the phenomenon that the scum layer cannot be scraped due to the fact that the scraper is not contacted with the scum layer can be effectively avoided, and the scum layer scraping stability is improved;

4. through the matching of the liquid level monitoring mechanism and the audible and visual alarm, the alarm can automatically remind people when the scum layer in the collecting box is full, so that the people can conveniently know and clean the scum layer in time, and the phenomenon that the scum layer overflows from the collecting box when the scum layer is not cleaned in time is reduced;

the utility model discloses a screw thread actuating mechanism and scraper blade cooperate, can carry out the automation to the scum layer that produces in the air supporting incasement and scrape the clearance and collect, setting through water level detection touch-control mechanism and solenoid valve, can be when the sewage liquid level reduces, add sewage in the automatic to the air supporting incasement, make the scum layer contact with the scraper blade always, can effectually avoid causing the phenomenon that can not strike off because of scraper blade and scum layer contactless, improve and strike off scum layer stability, and the cooperation through liquid level monitoring mechanism and audible-visual annunciator, automatic alarm when scum layer is filled with in the collecting box reminds personnel, make things convenient for personnel in time to learn and clear up, reduce the phenomenon that the scum layer spilled over from the collecting box when untimely because of the clearance.

Drawings

FIG. 1 is a perspective view of a dissolved air flotation device for sewage treatment according to the present invention;

FIG. 2 is a schematic sectional view of a dissolved air floatation device for sewage treatment according to the present invention;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2;

fig. 4 is an enlarged schematic structural view of a portion B in fig. 2.

In the figure: 100. an air flotation tank; 101. a cover plate; 102. a compressed air machine; 103. a pressure pump; 104. a transverse tube; 105. a collection box; 1. a squeegee; 2. a discharge hole; 3. a reciprocating screw; 4. a guide bar; 5. a drive motor; 6. a support plate; 7. a floating ball; 8. an L-shaped rod; 9. a connecting rod; 10. a first groove; 11. positioning blocks; 12. a second tact switch; 13. an audible and visual alarm; 14. an electromagnetic valve; 15. a rectangular groove; 16. a floating box; 17. a first tact switch; 18. pressing the block in a touching manner; 19. and (5) positioning the rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-4, a dissolved air flotation device for sewage treatment includes an air flotation tank 100 with an opening at the top, wherein the bottom of the air flotation tank 100 is communicated and fixed with a drain valve, both sides of the bottom of the air flotation tank 100 are fixedly connected with support blocks, the drain valve is located between the two support blocks, the drain valve is used for draining water in the air flotation tank 100, the support blocks have a supporting effect on the air flotation tank 100, the left bottom of the air flotation tank 100 is fixedly connected with an air supply mechanism, the air supply mechanism includes a compressed air machine 102 fixedly installed at the left bottom of the air flotation tank 100, the left side of the compressed air machine 102 is provided with a pressure pump 103, the exhaust end of the pressure pump 103 is communicated with the air inlet end of the compressed air machine 102, and the exhaust end of the compressed air machine 102 extends into the air flotation tank 100;

the air blowing mechanism is fixedly connected between the inner walls of the two sides of the air floating box 100, the exhaust end of the compressed air machine 102 is communicated and fixed with the left side of the air blowing mechanism, the air blowing mechanism comprises a transverse pipe 104 fixedly connected between the inner walls of the two sides of the air floating box 100, the right end of the transverse pipe 104 is provided with a plugging mechanism, the left end of the transverse pipe 104 is communicated and fixed with the right end of the exhaust end of the compressed air machine 102, and the top of the transverse pipe 104 is communicated and fixed with a plurality of air blowing heads;

the top of the air flotation tank 100 is fixedly connected with a cover plate 101, the top of the cover plate 101 is embedded with an exhaust pipe, the exhaust pipe is used for exhausting gas in the air flotation tank 100, the air flotation tank 100 is filled with sewage, a scraper blade 1 is movably contacted on the liquid level of the sewage, the scraper blade 1 is used for scraping a scum layer, a thread driving guide mechanism is installed between the inner walls at two sides of the air flotation tank 100, the scraper blade 1 is sleeved on the thread driving guide mechanism, the top of the right side of the air flotation tank 100 is fixedly connected with a driving motor 5, the output shaft of which is fixedly connected with the thread driving guide mechanism, wherein the thread driving guide mechanism comprises a guide rod 4 fixedly connected between the inner walls at two sides of the air flotation tank 100, the scraper blade 1 is sleeved on the guide rod 4 in a sliding manner, the right side of the scraper blade 1 is provided with a guide hole, and the inner wall of the guide hole is slidably connected with the outer side of the guide rod 4, the guide rod 4 is matched with the guide hole to guide the scraper 1, a reciprocating lead screw 3 is rotatably arranged between the inner walls of two sides of the air flotation box 100, circular holes are formed in the inner walls of two sides of the air flotation box 100, a sealing bearing is fixedly sleeved in each circular hole, the inner side of an inner ring of each sealing bearing is fixedly connected with the outer side of the corresponding reciprocating lead screw 3, each sealing bearing has the effect of rotatably mounting the corresponding reciprocating lead screw 3 between the inner walls of two sides of the air flotation box 100, the scraper 1 is sleeved on the corresponding reciprocating lead screw 3 in a threaded manner, a reciprocating screw hole is formed in the right side of the scraper 1 and is in threaded connection with the corresponding reciprocating lead screw 3, the reciprocating lead screw 3 can drive the scraper 1 to reciprocate right and left while the reciprocating lead screw 3 rotates, and the left end of an output shaft of the driving motor 5 is fixedly connected with the right end of the corresponding reciprocating lead screw 3;

the bottom of the scraping plate 1 is provided with a rectangular groove 15, a water level monitoring touch mechanism is installed in the rectangular groove 15, the bottom of the right side of the air floating box 100 is communicated with and fixed with an electromagnetic valve 14 electrically connected with the water level monitoring touch mechanism, the electromagnetic valve 14 is used for being connected with an external water supply pipeline, the water level monitoring touch mechanism comprises a floating box 16 which is slidably sleeved in the rectangular groove 15, the bottom of the floating box 16 is flush with the bottom of the scraping plate 1, a touch pressing block 18 which is slidably connected in the floating box 16 is fixedly connected to the inner wall of the right side of the rectangular groove 15, the front side and the rear side of the touch pressing block 18 are respectively in movable contact with the inner wall of the front side and the inner wall of the rear side of the floating box 16, the inner wall of the top of the floating box 16 and the inner wall of the top of the rectangular groove 15 are respectively and fixedly connected with a first light touch switch 17, the first light touch switch 17 positioned above is matched with the top of the floating box 16, the first light touch switch 17 positioned below is matched with the top of the touch pressing block 18, and the two first light touch switches 17 are both electrically connected with the electromagnetic valve 14;

the inner walls of two sides of the air flotation tank 100 are respectively provided with a discharge hole 2, the discharge holes 2 are used for discharging a scum layer, the two sides of the air flotation tank 100 are movably clamped with a collection box 105 respectively matched with the corresponding discharge holes 2, wherein two sides of the air flotation tank 100 are respectively and fixedly connected with a support plate 6, the top of the support plate 6 is fixedly connected with a clamping rod, the bottom of the collection box 105 is provided with a clamping groove, the inner wall of the clamping groove is sheathed with the outer side of the corresponding clamping rod in a sliding way, the top of the support plate 6 is in movable contact with the bottom of the corresponding collection box 105 and is matched with the support and limit of the collection box 105 through the support plate 6 and the clamping rod, the collection box 105 is provided with a liquid level monitoring mechanism, the bottom of the collection box 105 is fixedly connected with an audible and visual alarm 13 electrically connected with the liquid level monitoring mechanism, wherein the liquid level monitoring mechanism comprises a floating ball 7 arranged in the collection box 105, and the top of the floating ball 7 is fixedly connected with a connecting rod 9, the top end of the connecting rod 9 extends to the upper side of the corresponding collecting box 105 and is fixedly connected with an L-shaped rod 8, one side of each collecting box 105, which is far away from each other, is provided with a first groove 10, a positioning rod 19 is fixedly connected between the inner wall of the top part and the inner wall of the bottom part of the first groove 10, one side of each L-shaped rod 8, which is far away from each other, is fixedly connected with a positioning block 11, the positioning blocks 11 are sleeved on the corresponding positioning rods 19 in a sliding manner, wherein the top parts of the positioning blocks 11 are provided with positioning holes, the positioning blocks 11 are matched with the corresponding positioning rods 19 to play a vertical guiding and positioning effect on the L-shaped rods 8, the inner wall of the top part of the first groove 10 is fixedly connected with a second light touch switch 12, the positioning blocks 11 are positioned below the corresponding second light touch switches 12 and are matched with the second light touch switches 12, and the second light touch switches 12 are electrically connected with the corresponding audible and visual alarms 13, second

light touch switch

12 and 13 electric connection's of audible-visual annunciator mode, can trigger the second when the scum layer reaches certain liquid level in collecting box 105 and lightly touch switch 12 and open, the second lightly touches switch 12 control audible-visual annunciator 13 and opens and send audible-visual annunciator and in time remind personnel, the utility model discloses a screw thread actuating mechanism and scraper blade 1 cooperate, can carry out the automatic clearance of scraping and collect to the scum layer that produces in the flotation tank 100, through the setting of water level detection touch-control mechanism and solenoid valve 14, can be when the sewage liquid level reduces, add sewage in the flotation tank 100 voluntarily for the scum layer can contact with scraper blade 1 always, can effectually avoid causing the phenomenon that can not strike off because of scraper blade 1 and scum layer contactless, improve and strike off scum layer stability, and through the cooperation of liquid level monitoring mechanism and audible-visual annunciator 13, can be when the scum layer is full of collecting box automatic alarm when filling up, make things convenient for personnel in time learn and clear up, reduce because of the phenomenon that the scum layer spilled from collecting box 105 when untimely in the clearance.

The working principle is as follows: when the device is used, the electromagnetic valve 14 is connected with an external water supply pipeline, external sewage can be added into the air flotation tank 100 through the electromagnetic valve 14 in advance, when dissolved air flotation operation is carried out, external air is extracted through the pressure pump 103, the extracted air enters the compressed air machine 102, the compressed air machine 102 compresses the entered air to generate high-pressure air, the generated high-pressure air is blown out through the transverse pipe 104 and the plurality of blowing heads in sequence to blow the air in the air flotation tank 100, highly dispersed micro bubbles are formed in water under the blowing of the air, the micro bubbles are used for adhering hydrophobic solid or liquid particles in the sewage to form a water-air-particle three-phase mixed system, and suspended matters are formed after the particles are adhered with the bubbles, the density of suspended matters is smaller than that of water to float, a scum layer formed by floating on the water surface of sewage floats, the driving motor 5 is started at the same time, an output shaft of the driving motor 5 drives the reciprocating screw rod 3 to rotate, under the action of a reciprocating screw hole arranged on the scraper blade 1, the reciprocating screw rod 3 rotates and drives the scraper blade 1 to reciprocate right and left on the guide rod 4, the scraper blade 1 moves rightwards and pushes the floated scum layer rightwards, so that the scum layer is discharged through the discharge hole 2 at the right side and falls into the collection box 105, the scraper blade 1 pushes the floated scum layer leftwards when moving leftwards, the scum layer is discharged through the discharge hole 2 at the left side and falls into the collection box 105, and the collection box 105 collects the scum layer;

when scum is scraped, the liquid level of sewage is gradually reduced, and the liquid level is reduced, and simultaneously, under the action of gravity, the floating box 16 moves downwards along with the liquid level of the sewage, the floating box 16 slides downwards on the touch and press block 18, the floating box 16 drives the first tact switch 17 below to move downwards to be in contact with the top of the touch and press block 18, the first tact switch 17 below is triggered to be turned on, the first tact switch 17 below controls the electromagnetic valve 14 to be turned on, so that the external sewage enters the air floating box 100 through the electromagnetic valve 14, as the sewage is increased, the liquid level of the sewage moves upwards, under the action of buoyancy, the floating box 16 moves upwards along with the liquid level, when the floating box 16 moves upwards to be in contact with the first tact switch 17 above, the first tact switch 17 above is triggered to be turned on, the electromagnetic valve 14 above is controlled to be turned off, the bottom of the scraper blade 1 is contacted with the scum layer again, the scum layer can be continuously scraped, so that when the liquid level of the sewage is reduced, the automatic addition of the sewage into the air floating box 100 can effectively avoid the phenomenon that the scum layer is not scraped, and the scraping of the scum layer cannot be caused by the scraping, and the scum layer cannot be effectively caused by the scraping phenomenon that the scum is not caused by the scum;

meanwhile, as the scum layer in the collection box 105 is increased, the liquid level of the scum layer is gradually increased, under the action of buoyancy, the floating ball 7 gradually moves upwards, the floating ball 7 drives the corresponding connecting rod 9 to move upwards, the connecting rod 9 drives the corresponding L-shaped rod 8 to move upwards, the L-shaped rod 8 drives the corresponding positioning block 11 to move upwards, when the positioning block 11 upwards slides on the corresponding positioning rod 19 to be in contact with the bottom of the second light touch switch 12, the second light touch switch 12 is triggered to be turned on, the second light touch switch 12 controls the corresponding audible and visual alarm 13 to be turned on to give an audible and visual alarm to remind people, the people can know that the scum layer in the collection box 105 is full, after hearing the alarm sound, the people can move the collection box 105 upwards to separate the collection box from the corresponding clamping rod and the support plate 6, the collection box 105 can be taken down to pour out and clean the scum layer in the collection box, so that the people can be warned to clean the scum layer when the scum layer in the collection box 105 is full, and the scum layer can be overflowed from the collection box 105 effectively reduced when the scum layer is not timely.

In the description of the present application, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, a connection through an intermediate medium, and a connection between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to specific circumstances.

The above, only be the embodiment of the preferred of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, which are designed to be replaced or changed equally, all should be covered within the protection scope of the present invention.

Claims

1. A dissolved air flotation device for sewage treatment comprises an air flotation tank (100) with an opening at the top, an air supply mechanism is fixedly connected to the bottom of the left side of the air flotation tank (100), and is characterized in that an air blowing mechanism is fixedly connected between the inner walls of the two sides of the air flotation tank (100), the right side of the air supply mechanism extends into the air flotation tank (100) and is fixedly communicated with the left side of the air blowing mechanism, a cover plate (101) is fixedly connected to the top of the air flotation tank (100), an exhaust pipe is embedded at the top of the cover plate (101), sewage is filled in the air flotation tank (100), a scraper (1) is movably contacted on the liquid level of the sewage, a thread drive guide mechanism is installed between the inner walls of the two sides of the air flotation tank (100), the scraper (1) is sleeved on the thread drive guide mechanism, a drive motor (5) with an output shaft fixedly connected with the thread drive guide mechanism is fixedly connected to the top of the right side of the air flotation tank (100), a rectangular groove (15) is formed in the bottom of the scraper (1), a monitoring touch mechanism is installed in the rectangular groove (15), a water level monitoring tank (100) is communicated with the bottom of the right side of the air flotation tank, a monitoring electromagnetic valve (105) is fixedly connected with a monitoring mechanism (14) which is fixedly connected with the air flotation tank (2), and is respectively arranged on the two sides of the monitoring collection tank (100), and a collection tank (2) which is respectively matched with the air flotation tank (100), and a collection tank (2), the bottom of the collecting box (105) is fixedly connected with an audible and visual alarm (13) which is electrically connected with the liquid level monitoring mechanism.

2. The dissolved air flotation device for sewage treatment according to claim 1, wherein the air supply mechanism comprises a compressed air machine (102) fixedly installed at the bottom of the left side of the air flotation tank (100), a pressure pump (103) is installed at the left side of the compressed air machine (102), the exhaust end of the pressure pump (103) is communicated with the air inlet end of the compressed air machine (102), and the exhaust end of the compressed air machine (102) extends into the air flotation tank (100).

3. The dissolved air flotation device for sewage treatment according to claim 2, wherein the blowing mechanism comprises a transverse pipe (104) fixedly connected between the inner walls of the two sides of the air flotation tank (100), the right end of the transverse pipe (104) is provided with a blocking mechanism, the left end of the transverse pipe (104) is fixedly communicated with the right end of the exhaust end of the compressed air motor (102), and the top of the transverse pipe (104) is fixedly communicated with a plurality of blowing heads.

4. The dissolved air flotation device for sewage treatment according to claim 3, wherein the screw thread drive guide mechanism comprises a guide rod (4) fixedly connected between the inner walls of the two sides of the air flotation tank (100), the scraper (1) is slidably sleeved on the guide rod (4), a reciprocating screw (3) is rotatably installed between the inner walls of the two sides of the air flotation tank (100), the scraper (1) is threadedly sleeved on the reciprocating screw (3), and the left end of the output shaft of the drive motor (5) is fixedly connected with the right end of the reciprocating screw (3).

5. The dissolved air flotation device for sewage treatment according to claim 4, wherein the water level monitoring touch mechanism comprises a floating box (16) slidably sleeved in the rectangular groove (15), a touch block (18) slidably connected in the floating box (16) is fixedly connected to the inner wall of the right side of the rectangular groove (15), first tact switches (17) are fixedly connected to the inner wall of the top of the floating box (16) and the inner wall of the top of the rectangular groove (15), the first tact switches (17) located above are matched with the top of the floating box (16), the first tact switches (17) located below are matched with the top of the touch block (18), and the two first tact switches (17) are electrically connected with the electromagnetic valve (14).

6. The dissolved air flotation device for sewage treatment according to claim 5, wherein the liquid level monitoring mechanism includes a floating ball (7) disposed in the collection box (105), a connecting rod (9) is fixedly connected to a top of the floating ball (7), a top end of the connecting rod (9) extends to a position above the corresponding collection box (105) and is fixedly connected with an L-shaped rod (8), a first groove (10) is formed on each of two sides of the collection box (105) away from each other, a positioning rod (19) is fixedly connected between a top inner wall and a bottom inner wall of the first groove (10), a positioning block (11) is fixedly connected to each of two inner walls of the L-shaped rods (8) away from each other, the positioning block (11) is slidably sleeved on the corresponding positioning rod (19), a second light touch switch (12) is fixedly connected to the top inner wall of the first groove (10), the positioning block (11) is located below the corresponding second light touch switch (12) and is matched with the second light touch switch (12), and the second light touch switch (12) is electrically connected with the corresponding audible and visual alarm (13).

7. The dissolved air flotation device for sewage treatment according to claim 1, wherein the supporting plates (6) are fixedly connected to both sides of the air flotation tank (100), the clamping rods are fixedly connected to the tops of the supporting plates (6), the clamping grooves are formed in the bottoms of the collecting tanks (105), the inner walls of the clamping grooves are slidably sleeved with the outer sides of the corresponding clamping rods, and the tops of the supporting plates (6) are in movable contact with the bottoms of the corresponding collecting tanks (105).

8. The dissolved air flotation device for sewage treatment according to claim 1, wherein the bottom of the air flotation tank (100) is communicated with and fixed with a drain valve, the two sides of the bottom of the air flotation tank (100) are fixedly connected with supporting blocks, and the drain valve is positioned between the two supporting blocks.