Dissolved air type air flotation machine

Abstract

The invention relates to the technical field of sewage treatment, in particular to a dissolved air flotation machine, a self-control assembly, a scraping assembly, a sleeve and a separation assembly are jointly arranged on the same axis, the self-control assembly is mounted right above the center of the bottom of an air flotation tank and used for receiving bubbles entering through a bubble conveying port, and the scraping assembly is mounted on the bottom of the air flotation tank. The self-control assembly controls the opening and closing degree of the self-control assembly under the influence of the number of bubbles, the scraping assembly is located between the self-control assembly and the bottom of the air floatation tank and swings in a reciprocating mode under the driving of rotation of the self-control assembly, and the sleeve is located between the self-control assembly and the separation assembly. The sleeve moves up and down in a reciprocating mode through rotation of the scraping and wiping assembly, and the separation assembly is limited by the sleeve so that movement of water surface scum can be kept consistent with movement of the separation assembly. The release rate of the bubbles is adjusted in a self-adaptive manner through the self-control assembly, so that the bubbles are in uniform contact with suspended solids in the wastewater.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a dissolved air flotation machine. Background Technology

[0002] Many production activities cause water pollution. For the long-term survival of humankind, wastewater treatment is necessary. Wastewater treatment is the process of removing pollutants from wastewater. Industrial wastewater contains pollutants that cannot be removed by conventional wastewater treatment. These pollutants include small particulate matter. The common method for treating small particulate matter is air flotation. The working principle of air flotation is to pressurize air to dissolve a large amount of air in water, and then reduce the pressure to cause a large number of tiny bubbles to precipitate from the water. These tiny bubbles adsorb the suspended solids and flocculent matter in the wastewater and eventually float to the surface.

[0003] Existing equipment for treating wastewater using the air flotation method typically employs a dissolved air flotation (DAF) machine. A DAF machine uses a large flotation tank as its carrier. First, flocculants and coagulants are added at the source of the wastewater to help the suspended solids in the wastewater aggregate. Then, wastewater with a large amount of air is introduced and depressurized through a release device to release air bubbles. These bubbles, carried by the water flow, enter the contact zone and adsorb onto the suspended solids. The suspended solids with the air bubbles adsorbed on their surface float to the water surface under the action of the bubbles, forming scum. The DAF machine relies on air as its buoyancy source, thus avoiding the generation of additional waste gas or wastewater pollution. Simultaneously, by utilizing the buoyancy principle of air bubbles, it improves the efficiency of wastewater treatment.

[0004] However, during the process of decompressing and releasing bubbles from wastewater with a large amount of air, the bubbles are introduced into the contact area from one end with the water flow. In this process, it is impossible to ensure that the bubbles and the suspended matter in the wastewater are in uniform contact, and there are dead corners that cannot be reached. As a result, the power of the releaser is reduced, the flotation rate is reduced, and the efficiency of the entire flotation machine is reduced.

[0005] To address this, existing technologies offer several solutions, such as replacing the flotation machine's drive system with a hydraulic drive, eliminating moving parts and separation baffles in the mixing and separation zones of the flotation machine, and injecting two-phase fluids into the contained liquid body to form a bubble dispersion. Hydraulic action ensures that the bubbles are almost completely dispersed throughout the entire body. The use of hydraulic effects to disperse the bubbles in designated areas solves the problem of uneven contact between bubbles and suspended solids. While uniform contact between bubbles and suspended solids improves flotation efficiency, maximizing bubble utilization can easily lead to bubble blockage, causing clogging of the equipment and sediments in the water. Existing technologies have not yet solved the problem of how to adaptively adjust the release rate of bubbles to achieve uniform contact with suspended solids in wastewater.

[0006] In view of this, in order to overcome the above-mentioned technical problems, the present invention designs a dissolved air flotation machine, which solves the above problems. Summary of the Invention

[0007] The technical problem to be solved by this invention is that, during the operation of a dissolved air flotation machine, it is difficult to simultaneously ensure the timeliness of bubble release adjustment and the uniformity of contact between bubbles and suspended matter.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] This invention provides a dissolved air flotation (DAF) machine, comprising a flotation tank, an air bubble delivery port at the center of the bottom of the flotation tank, an output port for discharging sediment from the bottom of the flotation tank connected to the left end of the bottom of the flotation tank, and a sludge discharge port on the right side of the flotation tank. The invention is characterized by further comprising a self-control component, a scraping component, a sleeve, and a separation component, all arranged on the same axis. The self-control component is installed directly above the center of the bottom of the flotation tank and is used to receive air bubbles entering through the air bubble delivery port. The self-control component controls its opening and closing degree based on the number of air bubbles. The scraping component is located between the self-control component and the bottom of the flotation tank and reciprocates under the drive of the rotation of the self-control component. The sleeve is located between the self-control component and the separation component and moves up and down reciprocally due to the rotation of the scraping component. The separation component is restricted by the sleeve to ensure that the movement of the scum on the water surface and the separation component are consistent.

[0010] In the process of treating wastewater using a dissolved air flotation (DAF) machine, the wastewater contains a large amount of suspended solids. Some of these suspended solids can settle to the bottom of the flotation tank and be separated later. However, a large amount of small particulate matter remains suspended in the wastewater and cannot settle to the bottom. DAF allows these unsettled suspended solids to float to the surface, where they can then be separated and discharged. The air bubbles are positioned at the bottom of the flotation tank because they possess buoyancy. Regardless of where the bubbles are placed, they cannot uniformly contact all suspended solids due to water flow. After entering from the bottom of the flotation tank, the bubbles are received by an automatic control component. The component's release rate controls the amount of bubbles discharged into the wastewater. Furthermore, due to the unique structure of the automatic control component, the bubbles can disperse in different directions. To avoid dead zones for air bubbles in the water, the scraping component is positioned between the automatic control component and the bottom of the flotation tank. When air bubbles are introduced, the automatic control component starts working, simultaneously driving the scraping component to scrape the sediment at the bottom of the flotation tank. This addresses the issue of bottom impurities. However, the flotation tank contains some suspended solids that are difficult to settle. For these suspended solids, the air bubbles following the automatic control component make uniform contact with the suspended solids, causing a large number of tiny air bubbles to adhere to the surface of the suspended solids. The suspended solids then float to the surface under the influence of these air bubbles, accumulating to form scum. While the scraping component cleans the sediment and impurities at the bottom of the flotation tank, it also acts on the separation component through a sleeve. Driven by the sleeve, the separation component separates the scum from the surface into a collection box at the right end of the flotation tank. Throughout this process, the movement of the separation component and the movement of the scum on the surface are synchronized.

[0011] Preferably, the self-control component includes gears, a storage tray, telescopic rods, and baffles. The bubbles are conveyed to the storage tray through the bubble conveying port. There are six telescopic rods arranged circumferentially and embedded in the storage tray. Their function is to transport the bubbles to the flotation tank via the telescopic rods. The baffles are fixedly connected to the end of each telescopic rod away from the center of the storage tray. The telescopic rods extend and retract outward under the impact of the bubble input. The gears rotate under the drive of the extension and retraction of the telescopic rods, and the rotation of the gears provides power to the scraping component.

[0012] When bubbles are introduced into the automatic control component through the bubble delivery port, they first enter the storage tray. The six telescopic rods are then circumferentially arranged and embedded in the storage tray to provide a channel for the bubbles to be output into the wastewater. However, a single channel cannot guarantee uniform contact between the bubbles and suspended solids in the wastewater. Therefore, the six telescopic rods in a circumferential array are designed to form the output channel for the bubbles. The bubbles and water flow together are introduced into the automatic control component through the release device. Therefore, the bubbles themselves have an impact force. When there are many bubbles, the combined impact force of the bubbles and water flow causes all the telescopic rods to extend outward together. The bubbles then disperse in different directions. This process can disperse the bubbles into the wastewater to achieve uniform contact with suspended solids. The extension of the telescopic rods drives the gear to rotate. The rotation of the gear provides power to the scraping component, because the scraping component also achieves its function through rotation, and the rotation of the gear can provide a power source for the scraper assembly.

[0013] Preferably, the scraping assembly includes a ratchet, a pawl, a scraper, and a connecting rod. The scraper is fixedly connected to the pawl. The ratchet rotates under the drive of a gear. The pawl, which cooperates with the ratchet, is fixedly connected to the sleeve via the connecting rod. The scraper and the pawl cooperate to make the sediment at the bottom of the flotation tank move in one direction. The ratchet swings to make the sleeve move up and down. The sleeve drives the separation assembly to push the scum on the surface of the flotation tank. The separation assembly, through the linkage of the sleeve and the scraping assembly, jointly achieves the separation of impurities in the entire flotation tank.

[0014] Because the wastewater contains some sedimentable impurities, these impurities that settle to the bottom of the flotation tank need to be treated. A gear in the automatic control unit drives a scraping component. The gear rotation drives a ratchet. During ratchet rotation, each tooth turn causes a pawl engaging with the ratchet to swing, simultaneously causing a scraper to swing. The scraper swings at the bottom of the flotation tank, scraping away the sediment. The three pawls move in one direction, causing the scraper to also move in one direction. This unidirectional movement moves the sediment at the bottom of the flotation tank in one direction, ultimately achieving separation. This prevents excessive sediment accumulation at the bottom of the flotation tank, which would reduce the efficiency of the flotation machine. The pawls engaging with the ratchet are fixedly connected to a sleeve via a connecting rod. The design includes a connecting rod on each pawl that connects to the sleeve. The intermittent swinging of the pawls causes the sleeve to move up and down. The end of the sleeve furthest from the scraping component is connected to a separation component. The up-and-down movement of the sleeve serves as a power source for the separation component to perform its function.

[0015] Preferably, the separation assembly includes a frame, a separation plate, a worm gear, a worm, and a traction rod. The separation plate is fixedly connected to the frame and has a louvered structure. The separation plate laterally covers the entire surface of the flotation tank. The traction rod is fixedly connected to a sleeve, and a worm is fixedly connected to the end of the traction rod away from the sleeve. The worm is driven by moving up and down through the sleeve. The worm gear and the worm cooperate to enable the separation plate to achieve unidirectional flipping.

[0016] When air bubbles adsorb onto suspended matter, the suspended matter with the adsorbed air bubbles rises to the surface under the action of buoyancy. When too much suspended matter rises, it accumulates and forms scum after a period of time. Conventional scrapers cannot guarantee that the scum will be completely removed because they are fixed above the water surface. They rely on the contact between the scraper and the water surface to push the scum and achieve the purpose of scraping. However, the contact between the scraper and the water surface cannot be well controlled. In other words, due to the limitations of the scraper installation method, the scum on the water surface cannot be completely separated. In fact, when there is too much interference between the scraper and the water surface, the movement of the scraper may even cause the scum on the water surface to fall back into the flotation tank, causing secondary pollution to the wastewater. Therefore, a separation component covering the entire surface of the flotation tank is designed. When the sleeve moves upward, it drives the traction rod to move upward, and the worm gear fixedly connected to the traction rod also moves upward. Since the worm wheel and the worm gear are installed together, the worm wheel is driven to rotate. The rotation of the worm gear enables the separation component to work. The separation plate in the separation component is rotated under the drive of the worm gear. During the rotation, the scum on the water surface moves in the same direction as the rotation of the separation plate under the action of the separation plate. Finally, it moves to the right end of the flotation tank and falls into the collection box at the right end of the flotation tank, thus achieving the purpose of separating the scum.

[0017] Preferably, the telescopic rod has multiple holes symmetrically formed, and the number of holes exposed to the flotation tank is changed by the degree of telescopic rod extension.

[0018] During the bubble release process, traditional methods can only control the amount of bubbles released by controlling the release device. However, the amount of bubbles released in the wastewater tank is invisible to the naked eye. Therefore, to control the amount of bubbles released, multiple holes can be symmetrically opened on the telescopic rod. Even without opening holes, bubbles can still be released into the wastewater through the telescopic rod to contact suspended solids. By opening holes, bubbles escape through them. In this process, when too many bubbles are released, the impact of the water flow causes the telescopic rod to extend outward, and the number of holes on the telescopic rod exposed to the wastewater increases. At this time, the bubbles disperse over a wider range and are less likely to cause blockage. When too few bubbles are released, the telescopic rod extends to a shorter length, and only one or two holes are exposed to the wastewater. Bubbles escape through these one or two holes, ensuring that the range of bubble dispersion is small, so that the bubbles still have a certain degree of concentration and can still contact and adsorb suspended solids well, ensuring the flotation efficiency when the amount of bubbles released is small.

[0019] Preferably, a spring is installed between the pawl and the ratchet. After the scraper scrapes once, the spring resets the pawl by its own function, so that the pawl can continuously drive the scraper to scrape repeatedly.

[0020] During the scraping process of the scraping component to scrape the sediment at the bottom of the flotation tank, some stubborn sediment may be encountered that is not easy to scrape or may be damaged by the scraping component if forcibly scraped up. This is mainly because after the pawl drives the scraper to scrape once, the stubborn sediment will exert a large force on the pawl. At this time, the pawl will lose its position and cannot return to the position of engaging with the ratchet, thus preventing the scraping of subsequent sediment. However, after installing a spring between the pawl and the ratchet, the spring's own function allows the pawl to perfectly reset after each swing, so as to form a continuous scraping action.

[0021] Preferably, the scrapers are connected to each other by a retractable push rod, the scrapers are arranged in a stepped manner, and the scrapers push the push rod with a pawl to make the sediment move sequentially from high to low and from inside to outside.

[0022] The sediment at the bottom of the flotation tank is removed by scrapers. The scrapers are connected to each other by retractable push rods, and the height of the scrapers decreases from the inside to the outside. In order to make the sediment height higher when there is too much sediment in the innermost part, the innermost scraper pushes the excess sediment outward under the push of the pawl. The pushed sediment moves to the next layer of scrapers under the stepped scraper structure. Similarly, only when there is too much sediment will the sediment accumulated in the innermost part be pushed outward layer by layer until it reaches the outlet for sediment removal.

[0023] Preferably, the right end of the separation plate is provided with an inclined surface connected to the slag discharge port, and the separation plate can push the floating slag to fall into the collection box along the inclined surface.

[0024] When the scum on the water surface moves towards the right end of the flotation tank under the push of the separation plate, it first passes through the scum discharge port. However, the scum is stubborn and tends to remain at the horizontal scum discharge port, which makes subsequent separation difficult. Therefore, an inclined surface connected to the scum discharge port is set at the right end of the separation plate so that the scum can fall smoothly into the collection box at the right end of the flotation tank after passing through the scum discharge port and then through the inclined surface, thus achieving the separation effect.

[0025] Preferably, the gear has six circumferentially spaced elliptical grooves, and a limiting rod for limiting the extension of the telescopic rod is installed in the elliptical grooves.

[0026] During the process of the air bubble moving the telescopic rod with the water flow, if the extension length is too long, the telescopic rod may detach from the storage tray. Therefore, six equidistant elliptical grooves are made on the gear, and a limiting rod is installed in the elliptical groove. The limiting rod is integrated with the telescopic rod. When the telescopic rod extends or retracts, the limiting rod moves in the elliptical groove. The shape of the elliptical groove restricts the movement path of the limiting rod, thereby controlling the degree of extension or retraction of the telescopic rod.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. The dissolved air flotation machine of the present invention adopts the principle of changing the number of holes exposed to wastewater by using an elongated telescopic rod. It utilizes the impact of the air bubbles themselves with the water flow to adaptively adjust the extension degree of the telescopic rod, so as to achieve a large-scale dispersion of air bubbles after passing through the telescopic component, thereby ensuring uniform contact between air bubbles and suspended solids in wastewater and improving the flotation efficiency of the entire air flotation machine.

[0029] 2. The dissolved air flotation machine of the present invention uses the telescopic rod in the telescopic assembly to drive the gear to rotate as the base, and the rotation of the gear is used to drive the ratchet to work. The ratchet teeth and the scraper cooperate with each other to scrape and clean the sediment at the bottom of the flotation tank, thereby ensuring that the sediment in the wastewater is separated in a timely manner.

[0030] 3. The dissolved air flotation machine of the present invention uses a connecting rod to move the sleeve up and down under the swing of the ratchet. By designing the separation plate structure and using the sleeve to drive the worm gear to control the movement of the separation plate, the movement of the scum and the separation plate are kept in sync, thereby achieving the purpose of separating the scum. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 This is the front view of the present invention;

[0033] Figure 3 This is a cross-sectional view of the bottom structure of the flotation tank of the present invention;

[0034] Figure 4 This is a cross-sectional view of the internal structure of the flotation tank of the present invention;

[0035] Figure 5 This is an overall internal structure diagram of the present invention;

[0036] Figure 6 This is a schematic diagram of the internal structural connection relationship of the present invention;

[0037] Figure 7 This is a schematic diagram of the surface structure of the self-control component of the present invention;

[0038] Figure 8This is a partially enlarged view of the present invention.

[0039] In the diagram: 1. Flotation tank; 101. Bubble delivery port; 102. Output port; 103. Collection box; 104. Slag discharge port; 2. Automatic control component; 21. Gear; 211. Elliptical chute; 212. Limiting rod; 22. Storage tray; 23. Telescopic rod; 231. Hole; 24. Baffle; 3. Scraping component; 31. Ratchet; 312. Spring; 32. Pawl; 33. Scraper; 331. Stepped shape; 332. Push rod; 34. Connecting rod; 4. Sleeve; 5. Separation component; 51. Separation plate; 52. Worm gear; 53. Worm; 54. Traction rod; 55. Louver; 56. Frame; 57. Inclined surface. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0041] like Figure 1 , 4 As shown, the dissolved air flotation machine provided by the present invention includes a flotation tank 1, with a bubble delivery port 101 at the center of the bottom of the flotation tank 1, an output port 102 for discharging sediment from the bottom of the flotation tank 1 connected to the left end of the bottom of the flotation tank 1, and a sludge discharge port 104 on the right side of the flotation tank 1. It also includes a self-control component 2, a scraper component 3, a sleeve 4, and a separation component 5. The self-control component 2, the scraper component 3, the sleeve 4, and the separation component 5 are arranged on the same axis. The self-control component 2 is installed directly above the center of the bottom of the flotation tank 1 and is used to receive bubbles entering through the bubble delivery port 101. The self-control component 2 controls its opening and closing degree according to the number of bubbles. The scraper component 3 is located between the self-control component 2 and the bottom of the flotation tank 1. The scraper component 3 reciprocates under the drive of the rotation of the self-control component 2. The sleeve 4 is located between the self-control component 2 and the separation component 5. The sleeve 4 moves up and down reciprocally due to the rotation of the scraper component 3. The separation component 5 is restricted by the sleeve 4 so that the movement of the scum on the water surface and the separation component 5 are consistent.

[0042] In the process of treating wastewater using a dissolved air flotation (DAF) machine, the wastewater contains a large amount of suspended solids. Some of these suspended solids can settle to the bottom of the DAF tank 1 and be separated, but a large amount of small particulate suspended solids remain suspended in the wastewater and cannot settle to the bottom of the DAF tank 1. By using the DAF method, the unsettled suspended solids can float to the surface and then be separated to achieve the purpose of wastewater discharge. The air bubbles are positioned at the bottom of the DAF tank 1 because air bubbles have buoyancy. Regardless of where the air bubbles are placed, they will not be able to evenly contact all the suspended solids in the water due to the water flow. After the air bubbles are introduced from the bottom of the DAF tank 1, they are received by the automatic control component 2. The release rate of the air bubbles controls the automatic control component 2, thereby controlling the amount of air bubbles output to the wastewater. Simultaneously, due to the unique structure of the automatic control component 2, the air bubbles can disperse in different directions, thus avoiding dead zones in the water. The scraping component... 3 is positioned between the automatic control component 2 and the bottom of the flotation tank 1. When air bubbles are introduced, the automatic control component 2 starts to work. While the automatic control component 2 is working, it can drive the scraping component 3 to scrape the sediment at the bottom of the flotation tank 1. This is for the treatment of bottom impurities. There are some suspended solids in the flotation tank 1 that are difficult to settle. For such suspended solids, the air bubbles after the automatic control component 2 come into uniform contact with the suspended solids, so that a large number of micro air bubbles are adsorbed on the surface of the suspended solids. Then, the suspended solids float to the water surface under the influence of the air bubbles. After accumulating, they form scum. The scum floats on the water surface. While the scraping component 3 is cleaning the sediment and impurities at the bottom of the flotation tank 1, the scraping component 3 acts on the separation component 5 through the sleeve 4. Under the drive of the sleeve 4, the separation component 5 separates the scum on the water surface into the collection box 103 at the right end of the flotation tank 1. In this process, by establishing the connection relationship between the separation component 5, the sleeve 4 and the scraping component 3, the movement of the separation component 5 and the movement of the scum on the water surface are kept in sync.

[0043] like Figure 6 As shown, the automatic control component 2 includes a gear 21, a storage tray 22, a telescopic rod 23, and a baffle 24. Bubbles are conveyed to the storage tray 22 through the bubble conveying port 101. There are six telescopic rods 23, which are arranged in a circle and embedded in the storage tray 22. Their function is to transport the bubbles to the flotation tank 1 through the telescopic rods 23. The baffle 24 is fixedly connected to the end of each telescopic rod 23 away from the center of the storage tray 22. The telescopic rods 23 extend and retract outward under the impact of the bubble input. The gear 21 rotates under the drive of the extension and retraction of the telescopic rods 23. The rotation of the gear 21 provides power to the scraping component 3.

[0044] When bubbles are introduced into the automatic control component 2 through the bubble delivery port 101, they first enter the storage tray 22. Six telescopic rods 23 are arranged in a circular pattern and embedded in the storage tray 22 to provide a channel for the bubbles to be output into the wastewater. However, a single channel cannot guarantee uniform contact between the bubbles and the suspended matter in the wastewater. Therefore, six telescopic rods 23 in a circular array are designed to form the output channel for the bubbles. The bubbles and water flow are introduced into the automatic control component 2 through the release device. Therefore, the bubbles themselves have an impact force. When there are many bubbles, the combined impact force of the bubbles and the water flow causes all the telescopic rods 23 to extend outward together. The bubbles then disperse in different directions. This process can disperse the bubbles into the wastewater to achieve uniform contact with the suspended matter. The extension of the telescopic rods 23 drives the gear 21 to rotate. The rotation of the gear 21 provides power to the scraping component 3, because the scraping component 3 also achieves its function by rotation. The rotation of the gear 21 can provide a power source for the scraper 33 set.

[0045] like Figure 3 As shown, the scraping assembly 3 includes a ratchet 31, a pawl 32, a scraper 33, and a connecting rod 34. The scraper 33 is fixedly connected to the pawl 32. The ratchet 31 rotates under the drive of the gear 21. The pawl 32, which cooperates with the ratchet 31, is fixedly connected to the sleeve 4 through the connecting rod 34. The scraper 33 and the pawl 32 cooperate to make the sediment at the bottom of the flotation tank 1 move in one direction. The ratchet swings to make the sleeve 4 move up and down. The sleeve 4 drives the separation assembly 5 to push the scum on the surface of the flotation tank 1. The separation assembly 5, through the linkage of the sleeve 4 and the scraping assembly 3, jointly realizes the separation of impurities in the entire flotation tank 1.

[0046] Because the wastewater contains some sedimentable impurities, these impurities that settle to the bottom of the flotation tank 1 need to be treated. The scraping assembly 3 is driven by gear 21 in the automatic control component 2. The rotation of gear 21 drives ratchet 31. During the rotation of ratchet 31, each tooth rotation causes the pawl 32, which engages with ratchet 31, to swing, simultaneously causing the scraper 33 to swing. The scraper 33 swings at the bottom of the flotation tank 1, scraping away the sediment and impurities. The three pawls 32 move in one direction, thus causing the scraper 33 to also move in one direction, scraping away the sediment and impurities. The sediment at the bottom of the flotation tank 1 also moves in one direction, eventually achieving separation. This prevents the flotation machine from becoming less efficient due to excessive sediment accumulation at the bottom of the flotation tank 1. The pawl 32, which cooperates with the ratchet 31, is fixedly connected to the sleeve 4 via a connecting rod 34. By design, each pawl 32 has a connecting rod 34 that connects to the sleeve 4. The pawl 32 can drive the sleeve 4 to move up and down while oscillating intermittently. The end of the sleeve 4 away from the scraping component 3 is connected to the separation component 5. The up and down movement of the sleeve 4 serves as a power source to help the separation component 5 achieve its function.

[0047] like Figure 5 , 6As shown, the separation component 5 includes a frame 56, a separation plate 51, a worm gear 52, a worm 53, and a traction rod 54. The separation plate 51 is fixedly connected to the frame 56 and has a louvered structure 55. The separation plate 51 laterally covers the entire surface of the flotation tank 1. The traction rod 54 is fixedly connected to a sleeve 4, and the end of the traction rod 54 away from the sleeve 4 is fixedly connected to the worm 53. The worm 53 is driven by the up-and-down movement of the sleeve 4. The worm gear 52 cooperates with the worm 53 to enable the separation plate 51 to achieve unidirectional flipping.

[0048] When air bubbles adsorb onto suspended matter, the suspended matter with air bubbles adsorbed on its surface floats to the water surface under the action of buoyancy. When too much suspended matter floats, it accumulates and forms scum after a period of time. The conventional scraper 33 cannot guarantee that the scum will be scraped clean. This is because the conventional scraper 33 is fixedly installed above the water surface. It pushes the scum on the water surface by contacting the scraper 33 to achieve the purpose of scraping. However, the contact between the scraper 33 and the water surface cannot be well controlled. In other words, due to the limitation of the installation method of the scraper 33, the scum on the water surface cannot be completely separated. In fact, when there is too much interference between the scraper 33 and the water surface, the movement of the scraper 33 may even cause the scum on the water surface to fall back into the flotation tank 1, causing secondary pollution to the wastewater. Therefore, a separation component 5 covering the entire surface of the flotation tank 1 is designed. When the sleeve 4 moves upward, it drives the traction rod 54 to move upward. The worm gear 53, which is fixedly connected to the traction rod 54, also moves upward. Since the worm wheel 52 is installed in conjunction with the worm gear 53, the worm wheel 52 is driven to rotate. The rotation of the worm gear 52 enables the separation component 5 to work. The separation plate 51 in the separation component 5 is rotated under the drive of the worm gear 52. During the rotation, the scum on the water surface moves in the same direction as the rotation of the separation plate 51 under the action of the separation plate 51. Finally, it moves to the right end of the flotation tank 1 and falls into the collection box 103 at the right end of the flotation tank 1, thus achieving the purpose of separating the scum.

[0049] like Figure 7 As shown, multiple holes 231 are symmetrically opened on the telescopic rod 23, and the number of holes 231 exposed to the flotation tank 1 is changed by the degree of telescopic rod 23 extension and retraction.

[0050] During the bubble release process, traditional methods can only control the amount of bubbles released by controlling the release device. However, the amount of bubbles released in the wastewater pool is invisible to the naked eye. Therefore, to control the amount of bubbles released, multiple holes 231 can be symmetrically opened on the telescopic rod 23. Even without opening holes 231, bubbles can still be released into the wastewater through the telescopic rod 23 to contact suspended solids. By opening holes 231, bubbles can escape through the holes 231. During this process, when too many bubbles are released, the impact of the bubbles with the water flow causes the telescopic rod 23 to extend outward, and the number of holes 231 on the telescopic rod 23 exposed to the wastewater increases. At this time, the range of bubble dispersion is also wider, and it is not easy to cause blockage. When too few bubbles are released, the extension length of the telescopic rod 23 is shorter. At this time, only one or two holes 231 are exposed to the wastewater. Bubbles escape through these one or two holes 231, which can ensure that the range of bubble dispersion is small, so that the bubbles still have a certain degree of concentration and can still contact and adsorb suspended solids well, ensuring the flotation efficiency when the amount of bubbles released is small.

[0051] like Figure 8 As shown, a spring 312 is installed between the pawl 32 and the ratchet 31. After the scraper 33 scrapes once, the spring 312 resets the pawl 32 by its own function, so that the pawl 32 can continuously drive the scraper 33 to scrape repeatedly.

[0052] During the scraping process of the scraping component 3 scraping the sediment at the bottom of the flotation tank 1, some stubborn sediments may be encountered that are not easy to scrape or may be damaged by the scraping component 3 if forcibly scraped up. This is mainly because after the scraper 33 drives the scraper 32 to scrape once, the stubborn sediment will exert a large force on the scraper 32. At this time, the scraper 32 will lose its position and cannot return to the position of engaging with the ratchet 31, thus preventing the scraping of subsequent sediments. However, after installing a spring 312 between the scraper 32 and the ratchet 31, the spring 312 can perfectly reset the scraper 32 after each swing, so as to form a continuous scraping action.

[0053] like Figure 3 As shown, the scrapers 33 are connected to each other by a retractable push rod 332. The scrapers 33 are arranged in a stepped shape 331. The scrapers 33 push the push rod 332 through the pawl 32 to make the sediment move from high to low and from inside to outside in sequence.

[0054] The sediment at the bottom of the flotation tank 1 is removed by scrapers 33. The scrapers 33 are connected to each other by retractable push rods 332, and the height of the scrapers 33 decreases from the inside to the outside. In order to make the sediment height higher when there is too much sediment in the innermost layer, the innermost scraper 33 pushes the excessive sediment outward under the push of the pawl 32. The pushed sediment moves to the next layer of scrapers 33 under the stepped arrangement of the scrapers 33. Similarly, only when there is too much sediment will the sediment accumulated in the innermost layer be pushed outward layer by layer until it reaches the outlet 102 for removing sediment.

[0055] like Figure 1 , 2 As shown, the right end of the separation plate 51 is provided with an inclined surface 57 connected to the slag discharge port 104. The separation plate 51 can push the slag to fall into the collection box 103 along the inclined surface 57.

[0056] When the scum on the water surface moves to the right end of the flotation tank 1 under the push of the separation plate 51, it first passes through the scum discharge port 104. However, the scum is stubborn and tends to remain at the horizontal scum discharge port 104, which makes subsequent separation difficult. Therefore, an inclined surface 57 connected to the scum discharge port 104 is provided at the right end of the separation plate 51, so that the scum falls smoothly into the collection box 103 at the right end of the flotation tank 1 after passing through the scum discharge port 104 and then through the inclined surface 57, thus achieving the effect of separation.

[0057] like Figure 7 As shown, the gear 21 has six elliptical grooves 211 that are equidistant from each other on the circumference. A limiting rod 212 for limiting the extension of the telescopic rod 23 is installed in the elliptical grooves 211.

[0058] During the process of the air bubble moving the telescopic rod 23 with the water flow, if the extension length is too long, the telescopic rod 23 may detach from the storage tray 22. Therefore, six circumferentially spaced elliptical grooves 211 are provided on the gear 21, and a limiting rod 212 is installed in the elliptical grooves 211. The limiting rod 212 is integrated with the telescopic rod 23. When the telescopic rod 23 extends or retracts, the limiting rod 212 moves in the elliptical grooves 211. The shape of the elliptical grooves 211 restricts the movement path of the limiting rod 212, thereby controlling the extension degree of the telescopic rod 23.

[0059] During the overall operation of the flotation machine, starting from the bubble delivery port 101 at the bottom of the flotation tank 1, the introduced bubbles are transported to the storage pan 22 through a hollow shaft. After passing through the storage pan 22 with the water flow, the bubbles are further transported to each telescopic rod 23. The impact force released by the bubbles as they flow with the water can cause the telescopic rods 23 to extend and retract. The telescopic rods 23 have linearly arranged holes 231 for the bubbles to be released into the wastewater through the holes 231. The six telescopic rods 23 are arranged circumferentially on the storage pan 22 and are connected to the storage pan 22 together. When the bubbles are carried by the water flow... When the impact force is too large, the extension rod 23 extends to a longer length, increasing the number of holes 231 exposed to the wastewater, expanding the bubble release range, and increasing the diameter of the bubble dispersion range. This improves the uniformity of contact between the bubbles and suspended matter in the wastewater. When the impact force of the bubbles with the water flow is small, the extension rod 23 extends to a shorter length, resulting in fewer holes 231 exposed to the wastewater. This leads to a smaller diameter of the bubble dispersion range, allowing the bubbles to still aggregate well and adsorb the suspended matter. After the bubbles are released into the wastewater, the suspended matter floats to the surface after adsorbing the bubbles. However, the wastewater also contains some sedimentable impurities, which need to be separated. As the bubbles drive the extension rod 23 to extend and retract, the extension rod 23 also drives the gear 21 to rotate. The gear 21 provides a power source for the scraping assembly 3. The rotation of the gear 21 drives the ratchet 31 in the scraping assembly 3 to rotate. The pawl 32, which cooperates with the ratchet 31, oscillates intermittently under the condition of the ratchet 31's rotation. At the same time, the spring 312 ensures that the pawl 32 can reset after each oscillation, thus repeating the cycle. The scraper 33 continuously separates the sediment from the bottom of the flotation tank 1. The pawl 32 has a connecting rod 34 that connects to the sleeve 4. The connecting rod 34 causes the pawl 32 to swing, driving the sleeve 4 to move up and down. The sleeve 4 engages with the worm gear 52 through the traction rod 54. The traction rod 54 moves up and down with the sleeve 4, driving the worm gear 53 to move up and down. The worm gear 52, which engages with the worm gear 53, starts to rotate, thereby controlling the movement of the separation plate 51. This allows the separation plate 51 to move while simultaneously driving the scum to move, ultimately achieving scum separation.

[0060] The foregoing has shown and described the basic principles and beneficial effects of the present invention. However, the present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its effects and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dissolved air flotation machine, comprising a flotation tank (1), wherein an air bubble conveying port (101) is provided at the center of the bottom of the flotation tank (1), an output port (102) for discharging sediment from the bottom of the flotation tank (1) is connected to the left end of the bottom of the flotation tank (1), and a sludge discharge port (104) is provided on the right side of the flotation tank (1), characterized in that: It also includes a self-control component (2), a scraping component (3), a sleeve (4), and a separation component (5). The self-control component (2), the scraping component (3), the sleeve (4), and the separation component (5) are arranged on the same axis. The self-control component (2) is installed directly above the center of the bottom of the flotation tank (1) and is used to receive the bubbles entering through the bubble delivery port (101). The self-control component (2) controls its opening and closing degree according to the number of bubbles. The scraping component (3) is located between the self-control component (2) and the flotation tank. Between the bottom of the pool (1), the scraping assembly (3) swings back and forth under the drive of the rotation of the self-control assembly (2). The sleeve (4) is located between the self-control assembly (2) and the separation assembly (5). The sleeve (4) moves up and down back and forth by the rotation of the scraping assembly (3). The right end of the separation assembly (5) is connected to the collection box (103) opened on the flotation tank (1) for collecting scum. The separation assembly (5) is restricted by the sleeve (4) so ​​that the movement of the scum on the water surface and the separation assembly (5) are consistent.

2. The dissolved air flotation machine according to claim 1, characterized in that: The self-control component (2) includes a gear (21), a storage tray (22), a telescopic rod (23), and a baffle (24). The bubbles are transported to the storage tray (22) through the bubble delivery port (101). There are six telescopic rods (23), which are arranged in a circle and embedded in the storage tray (22). Their function is to transport the bubbles to the flotation tank (1) through the telescopic rods (23). The baffle (24) is fixedly connected to the end of each telescopic rod (23) away from the center of the storage tray (22). The telescopic rods (23) extend and retract outward under the impact of the bubble input. The gear (21) rotates under the drive of the extension and retraction of the telescopic rods (23). The gear (21) provides power to the scraping component (3) by rotating.

3. The dissolved air flotation machine according to claim 1, characterized in that: The scraping assembly (3) includes a ratchet (31), a pawl (32), a scraper (33), and a connecting rod (34). The pawl (32) is fixedly connected to the scraper (33). The ratchet (31) rotates under the drive of the gear (21). The pawl (32) that cooperates with the ratchet (31) is fixedly connected to the sleeve (4) through the connecting rod (34). The scraper (33) and the pawl (32) cooperate with each other to make the sediment at the bottom of the flotation tank (1) move in one direction. The ratchet swings to make the sleeve (4) move up and down. The sleeve (4) drives the separation assembly (5) to push the scum on the surface of the flotation tank (1). The separation assembly (5) achieves the separation of impurities in the entire flotation tank (1) through the linkage of the sleeve (4) and the scraping assembly (3).

4. The dissolved air flotation machine according to claim 1, characterized in that: The separation assembly (5) includes a frame (56), a separation plate (51), a worm gear (52), a worm (53), and a traction rod (54). The separation plate (51) is fixedly connected to the frame (56). The separation plate (51) has a louvered (55) structure. The separation plate (51) covers the entire surface of the flotation tank (1) laterally. The traction rod (54) is fixedly connected to a sleeve (4). The end of the traction rod (54) away from the sleeve (4) is fixedly connected to a worm (53). The worm (53) is driven by the up-and-down movement of the sleeve (4). The worm gear (52) cooperates with the worm (53) to enable the separation plate (51) to achieve unidirectional rotation.

5. A dissolved air flotation machine according to claim 2, characterized in that: The telescopic rod (23) is symmetrically provided with multiple holes (231), and the number of holes (231) exposed to the flotation tank (1) is changed by the degree of extension and retraction of the telescopic rod (23).

6. A dissolved air flotation machine according to claim 3, characterized in that: A spring (312) is installed between the pawl (32) and the ratchet (31). After the scraper (33) scrapes once, the spring (312) resets the pawl (32) by its own function, so that the pawl (32) continuously drives the scraper (33) to scrape repeatedly.

7. A dissolved air flotation machine according to claim 4, characterized in that: The scrapers (33) are connected to each other by a retractable push rod (332). The scrapers (33) are arranged in a stepped (331) manner. The scrapers (33) push the push rod (332) through the pawl (32) to make the sediment move from high to low and from inside to outside in sequence.

8. A dissolved air flotation machine according to claim 1, characterized in that: The right end of the separation plate (51) is provided with an inclined surface (57) connected to the slag discharge port (104), and the separation plate (51) pushes the slag to fall into the collection box (103) along the inclined surface (57).

9. A dissolved air flotation machine according to claim 1, characterized in that: The gear (21) has six elliptical grooves (211) spaced equidistantly around its circumference, and a limiting rod (212) for limiting the extension of the telescopic rod (23) is installed in the elliptical grooves (211).

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