Sewage coagulation dissolved air flotation treatment equipment

Abstract

The invention discloses sewage coagulation dissolved air flotation treatment equipment which comprises a scum pool, a scum collecting pool and a scum scraping assembly, the scum scraping assembly comprises a conveying belt and a scraper arranged on the conveying belt, the scraper is connected with the conveying belt through a telescopic mechanism, the telescopic mechanism comprises a rotating shaft and a shaft sleeve rotationally arranged on the rotating shaft in a sleeving mode, and the shaft sleeve is connected with the conveying belt through a connecting rod. The shaft sleeve is fixedly connected with the conveying belt, blocking bodies located on the two sides of the shaft sleeve are arranged on the two sides of the rotating shaft, reset springs are arranged between the blocking bodies and the shaft sleeve, the first end of the rotating shaft is connected with the scraper blade, and a clamping head is arranged at the second end of the rotating shaft. The telescopic mechanism with the reset spring is arranged between the scraper blade and the conveying belt, the driving shaft is matched with the arc-shaped clamping groove, and when the scraper blade runs to the end, meshing of the rotating shaft and rotation of the scraper blade are automatically achieved, so that attachments on the scraper blade are effectively thrown off under the action of centrifugal force, and the attachments are prevented from affecting the working performance of the scraper blade; and the self-cleaning capability of the scraper is improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater coagulation dissolved air flotation treatment device. Background Technology

[0002] Wastewater coagulation dissolved air flotation technology is a highly efficient solid-liquid separation technology. Fine suspended solids in wastewater are usually charged and have small particle sizes. By adding coagulants, the surface charge of the particles is destroyed, causing multiple tiny particles to aggregate and form large flocs.

[0003] As disclosed in Chinese utility model patent CN221894842U, entitled "A Reflux Pressurized Dissolved Air Flotation Device," dissolved air flotation involves dissolving air in water under high pressure and then releasing it instantaneously under normal pressure, generating a large number of microbubbles. These microbubbles easily adhere to the surface of the flocs, reducing their apparent density and causing them to quickly float to the surface, forming scum. The scum is then removed by a scraping mechanism, achieving efficient solid-liquid separation.

[0004] Although dissolved air flotation has significant advantages in wastewater treatment, it also has some drawbacks in practical applications. Current devices for scum removal use conveyor belt-driven scrapers that move along the surface of the scum tank from the inlet end to the end where the scum collection tank is located. Since the scum is a flocculent body containing a large number of microbubbles, a large amount of scum will adhere to the scraper and cannot fall freely into the scum collection tank. Instead, it will move with the scraper to the top of the conveyor belt and then back to the inlet end, which reduces the efficiency of scum removal. Long-term floc adhesion can also cause the dirt on the scraper surface to solidify and thicken, or cause the adhesion of slime bacteria, algae and other organisms, thereby affecting the structural parameters such as the shape and weight of the scraper and further deteriorating its efficiency. Not only does it make the scraper more prone to floc adhesion, but it may also increase the scraper's movement resistance, affecting the scum removal efficiency and its hydrodynamic characteristics. Summary of the Invention

[0005] To solve at least one of the above-mentioned technical problems, the present invention provides a wastewater coagulation dissolved air flotation treatment device, which enables the scraper to use centrifugal force to promptly remove the attached material, thereby preventing the attached material from affecting the working performance of the scraper.

[0006] The technical solution adopted in this invention is to design a wastewater coagulation dissolved air flotation treatment device, including a scum tank, a scum collection tank, and a scum scraping assembly. The scum scraping assembly includes a conveyor belt and a scraper disposed on the conveyor belt. The scraper and the conveyor belt are connected by a telescopic mechanism. The telescopic mechanism includes a rotating shaft and a rotatable bushing sleeved on the rotating shaft. The bushing sleeve is fixedly connected to the conveyor belt. Stops are provided on both sides of the rotating shaft located on both sides of the bushing sleeve. A return spring is provided between the stop and the bushing sleeve. The first end of the rotating shaft is connected to the scraper, and the second end of the rotating shaft is... The scraper assembly includes a clamping head; the scraper assembly further includes a rotary drive device, the rotary drive device includes a drive shaft, the drive shaft is controlled to rotate by a motor, and the end of the drive shaft facing the scum collection tank is provided with an arc-shaped groove located on the moving path of the clamping head. When the scraper is above the scum collection tank, the clamping head engages with the arc-shaped groove; the processing equipment also includes a chute guide rail provided along the moving path of the scraper, and a slider is provided on the back of the scraper that slides with the chute guide rail. When the clamping head engages with the arc-shaped groove, the slider leaves the chute guide rail.

[0007] In some embodiments, the conveyor belt has two corresponding pulleys at its end, and the drive shaft is located between the two pulleys.

[0008] In some embodiments, the conveyor belt includes two belt bodies arranged synchronously side by side, with the bushing connecting the two belt bodies.

[0009] In some embodiments, there are two guide chutes, located on both sides of the conveyor belt.

[0010] In some embodiments, a protective cover is provided above the scum collection tank.

[0011] In some embodiments, the scraper and the rotating shaft are rotatably connected by a first shaft hinge, the hinge axis of the first shaft hinge being perpendicular to the rotating shaft, and a first limiting body located behind the scraper is provided at the end of the rotating shaft, the first limiting body causing the scraper to rotate only forward and not backward.

[0012] In some embodiments, the scraper includes a first plate and a second plate. The first plate is connected to the rotating shaft, and the second plate is rotatably connected to the first plate via a second shaft hinge. The density of the second plate is lower than the density of the sewage in the scum pond. The first plate is provided with second baffles located on the front and rear sides of the second plate, and the included angle between the two second baffles is less than 90 degrees.

[0013] In some embodiments, the scraper is a magnet.

[0014] In some embodiments, the scraper is made of a ferromagnetic material.

[0015] In some embodiments, the guide groove is magnetic.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention incorporates a telescopic mechanism with a return spring between the scraper and the conveyor belt. Through a drive shaft engaging with an arc-shaped groove, the mechanism automatically engages with the shaft and rotates the scraper when it reaches its end. This allows the debris on the scraper to be effectively flung off under centrifugal force, preventing it from affecting the scraper's performance, improving its self-cleaning ability, and reducing manual maintenance. The dual-belt conveyor, dual-guide chute, and slider limiting structure work together to ensure the lateral stability and consistent posture of the scraper during surface sludge removal. The dual-pulley arrangement at the end provides more space for the drive shaft, increasing structural flexibility. Attached Figure Description

[0017] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings. To illustrate the details and facilitate understanding of its principles, the drawings are not necessarily to scale, and similar reference numerals may describe similar components in different views. The accompanying drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Wherein: Figure 1 This is a schematic diagram of the processing device in the embodiment.

[0018] Figure 2 This is a top view of the slag scraper assembly.

[0019] Figure 3 yes Figure 2 Enlarged diagram of point A in the middle.

[0020] Figure 4 yes Figure 2 A schematic diagram showing the middle side scraper forming a 90° angle with the rotating shaft.

[0021] Figure 5 yes Figure 4 A schematic diagram of the BB cross section.

[0022] Figure 6 yes Figure 5 Enlarged diagram of point D in the middle.

[0023] Figure 7 yes Figure 4 A schematic diagram of the CC section.

[0024] Figure 8 This is an enlarged schematic diagram of the scraper in Embodiment 2.

[0025] In the diagram, 1. Mixing tank; 2. Flocculation tank; 3. Scum tank; 4. Scum collection tank; 5. Conveyor belt; 51. Belt body; 6. Scraper; 61. First plate body; 62. Second plate body; 63. Slider; 7. Rotating shaft; 71. Clamping head; 8. Bushing; 9. Drive shaft; 91. Arc-shaped groove; 10. Return spring; 11. Slide rail; 12. Pulley; 13. Motor; 14. Protective cover; 15. First shaft hinge; 16. First limiting body; 17. Water body; 18. Flocs; 19. Second shaft hinge; 20. Second stop body; 21. Bevel gear mechanism; 22. Connecting rod. Detailed Implementation

[0026] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments, and the following embodiments do not limit the invention covered by the claims. Furthermore, not all combinations of the features described in the embodiments are necessary for the inventive solution.

[0027] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0028] Example 1 like Figure 1 As shown, a wastewater coagulation dissolved air flotation treatment device includes a mixing tank 1, a flocculation tank 2, a scum tank 3, and a scum collection tank 4 arranged sequentially in a front-to-back direction. A scum scraping assembly is provided above the scum tank, and the scum scraping assembly includes a conveyor belt 5 and a scraper 6 disposed on the conveyor belt.

[0029] The mixing tank is used to achieve rapid and uniform mixing of coagulant and sewage, improving the instability efficiency of colloidal particles. The flocculation tank provides sufficient space for slow stirring and reaction of flocs, allowing the flocs to gradually grow and form a structure suitable for air flotation attachment. A release device for releasing air bubbles is set at the bottom of the flocculation tank. The flocculated suspended matter is supported by the released air bubbles and floats to the surface, flowing into the scum tank. The scum tank is used to realize dissolved air release and floc separation. The scum scraping assembly set above it is continuously driven by a conveyor belt to move the scraper, which can stably and continuously scrape the scum formed on the surface to the scum collection tank, avoiding scum accumulation and secondary settling. The basic working principle of the equipment is similar to that of the Chinese utility model patent with announcement number CN221894842U and title "A reflux pressurized dissolved air flotation device". Therefore, the details and principles of the prior art will not be repeated here. Only the unique features of this embodiment that are different from the prior art will be explained in detail below.

[0030] like Figure 2 , 3As shown in Figures 5 and 6, unlike the prior art, in this embodiment, the scraper 6 and the conveyor belt 5 are connected by a telescopic mechanism. The telescopic mechanism includes a rotating shaft 7 and a bushing 8 that slides on the rotating shaft 7. The bushing 8 is fixedly connected to the conveyor belt 5. There are stops on both sides of the rotating shaft 7 located on both sides of the bushing 8. The stops limit the telescopic range of the rotating shaft 7 relative to the bushing 8. A cylindrical return spring 10 is provided between the stop and the bushing 8. The two ends of the return spring 10 can be supported by axial thrust bearings to support the stop and the bushing 8, thereby reducing the frictional force of the return spring 10 relative to the bushing 8 or the stop.

[0031] The first end of the rotating shaft 7 is connected to the scraper 6, and the second end of the rotating shaft 7 is provided with a flat clamp 71 in the middle; the slag scraping assembly also includes a rotary drive device, which includes a drive shaft 9, which is controlled to rotate by a motor 13. The drive shaft 9 is set in a horizontal state and is located on the inner side of the end of the conveyor belt 5 near the scum collection tank 4.

[0032] The end of the drive shaft 9 facing the scum collection tank 4 is provided with an arc-shaped groove 91 located on the moving path of the clamp 71. The width of the arc-shaped groove 91 is slightly larger than the width of the clamp 71, allowing the clamp 71 to slide up and down along the arc-shaped groove 91 without rotating relative to it. The bottom of the arc-shaped groove 91 is an arc-shaped protrusion facing the scum collection tank 4. When the scraper 6 is above the scum collection tank 4, the clamp 71 engages with the arc-shaped groove 91, thereby causing the rotation of the drive shaft 9 to drive the rotation of the rotating shaft 7 synchronously, thus causing the scraper 6 to rotate and remove the attached material from the scraper 6. The motor 13 is connected to the drive shaft 9 through a bevel gear mechanism 21.

[0033] The processing equipment also includes a trough guide rail 11 arranged along the moving path of the scraper 6. That is, the trough guide rail 11 is a groove-shaped guide rail parallel to the conveyor belt 5. The back of the scraper 6 is provided with a slider 63 that slides in cooperation with the trough guide rail 11. When the conveyor belt 5 drives the scraper 6 to move, the slider 63 slides in the groove of the trough guide rail 11, thereby preventing the rotating shaft 7 of the scraper 6 from rotating relative to the bushing 8, so as to make the scraper 6 move laterally and stably along the surface of the scum pool 3. When the clamp 71 is engaged in the arc-shaped clamp 91, the slider 63 leaves the trough guide rail 11, so that the scraper 6 can be driven by the rotating shaft 7 to rotate freely. The conveyor belt 5 drives the scraper 6 to move. When the scraper 6 moves to the end of the conveyor belt 5, the clamp 71 at the end of the rotating shaft 7 connected to the scraper 6 slides upward into the arc-shaped groove 91. When the rotating shaft 7 is coaxial with the drive shaft 9, the clamp 71 is supported at the highest position of the arc-shaped protrusion at the bottom of the arc-shaped groove 91, so that the rotating shaft 7 overcomes the elastic force of the return spring 10 and extends forward, thereby causing the slider 63 to leave the slide rail 11.

[0034] The conveyor belt 5 has two corresponding pulleys 12 at its end, and the drive shaft 9 is located between the two pulleys 12. By providing one pulley 12 at the end and supporting it with two pulleys 12, the diameter of the pulley 12 can be smaller, and the height of the conveyor belt 5 at the end can be set larger, which is more conducive to the setting of the drive shaft 9 and the control of the scraper 6 rotation.

[0035] The conveyor belt 5 includes two belt bodies 51 arranged synchronously side by side. The bushing 8 is connected between the two belt bodies 51. The bushing 8 is connected to the belt bodies 51 on both sides through the connecting rod 22. The pulleys 12 at the lower ends of the two belt bodies 51 are connected to the rotating shaft 7 of the same motor 13 and are driven to rotate synchronously by the motor 13.

[0036] There are also two guide chutes, which are symmetrically located on both sides of the conveyor belt 5, so that the scraper 6 moves more stably.

[0037] A protective cover 14 is provided above the scum collection pool 4, so that the attached material on the scraper 6 is thrown onto the protective cover 14 and then falls into the scum collection pool 4 below along the protective cover 14.

[0038] like Figure 4 , 7As shown, the scraper 6 and the rotating shaft 7 are rotatably connected by a first shaft hinge 15. The hinge axis of the first shaft hinge 15 is perpendicular to the rotating shaft 7. A first limiting body 16 is provided at the end of the rotating shaft 7 behind the scraper 6. The first limiting body 16 makes the scraper 6 only able to rotate forward in the moving direction and not backward. This means that the scraper 6 below the conveyor belt 5 can only rotate forward from a vertical position and not backward. As a result, the scraper 6 remains vertical when moving forward along the water surface, thereby scraping off the flocs 18 on the surface of the water body 17. When the scraper 6 moves to the end of the conveyor belt 5 and is controlled to rotate by the drive shaft 9, under the action of centrifugal force and air resistance during rotation, the scraper 6 is at a 90-degree angle to the rotating shaft 7, thereby reducing the air resistance it receives.

[0039] Furthermore, the scraper can be a magnet, so that the scraper can adsorb ferromagnetic scum, and then mainly use centrifugal force to throw it into the scum collection tank.

[0040] Alternatively, the scraper may be made of ferromagnetic material to adsorb magnetic scum, for example, magnetic powder may be added to some flocculants.

[0041] Alternatively, the scraper may be made of ferromagnetic material and the guide groove may be magnetic, so that the magnetic attraction of the scraper is obtained from the guide groove in contact with it. For example, the guide groove may be a magnet or part of a magnet or in contact with a magnet. When the scraper rotates, the scraper disengages from the guide groove, which helps to remove the attached material.

[0042] Example 2 like Figure 8As shown, the scraper 6 can be composed of a first plate 61 and a second plate 62. The first plate 61 is connected to the rotating shaft 7, and the second plate 62 is rotatably connected to the first plate 61 via a second shaft hinge 19. The density of the second plate 62 is lower than that of the sewage in the scum tank 3, that is, the second plate 62 is made of a lightweight material that can float in water, such as a lightweight plate with a honeycomb sandwich structure. The first plate 61 is provided with second baffles 20 located on the front and rear sides of the second plate 62. The front second baffle 20 can be the edge of the first plate 61 located in front of the second shaft hinge 19, and the included angle between the two second baffles 20 is less than 90 degrees. This design allows the second plate of the scraper below the conveyor belt to rotate forward by less than 90 degrees from a vertical position. Thus, when the second plate 62 is in the water, buoyancy causes it to rotate forward and upward relative to the first plate 61, giving the scraper 6 a forward-bent lower end, which is more conducive to scraping off scum. When the scraper 6 moves to the scum collection pool 4 and leaves the water surface of the scum pool 3, the second plate 62 naturally rotates back to be on the same plane as the first plate 61, which is conducive to the scum falling and being scraped into the scum collection pool 4 by the scum pool 3, without affecting the rotation of the scraper 6 relative to the rotating shaft 7.

[0043] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art can make various modifications or additions to the described embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A wastewater coagulation dissolved air flotation treatment device, comprising a scum tank, a scum collection tank, and a scum scraping assembly, wherein the scum scraping assembly comprises a conveyor belt and scrapers disposed on the conveyor belt, characterized in that: The scraper and the conveyor belt are connected by a telescopic mechanism. The telescopic mechanism includes a rotating shaft and a rotating bushing fitted on the rotating shaft. The bushing is fixedly connected to the conveyor belt. Stops are provided on both sides of the rotating shaft and on both sides of the bushing. A return spring is provided between the stop and the bushing. The first end of the rotating shaft is connected to the scraper, and the second end of the rotating shaft is provided with a clamping head. The slag scraping assembly also includes a rotary drive device, which includes a drive shaft controlled by a motor. The end of the drive shaft facing the slag collection tank has an arc-shaped groove on the moving path of the clamping head. When the scraper is above the slag collection tank, the clamping head engages in the arc-shaped groove. The processing equipment also includes a chute guide rail along the moving path of the scraper. A slider is provided on the back of the scraper that slides with the chute guide rail. When the clamping head engages in the arc-shaped groove, the slider leaves the chute guide rail.

2. The wastewater coagulation dissolved air flotation treatment equipment according to claim 1, characterized in that, The conveyor belt has two corresponding pulleys at its ends, and the drive shaft is located between the two pulleys.

3. The wastewater coagulation dissolved air flotation treatment equipment according to claim 1, characterized in that, The conveyor belt includes two belt bodies arranged synchronously side by side, and the bushing connects the two belt bodies.

4. The wastewater coagulation dissolved air flotation treatment equipment according to claim 1, characterized in that, There are two guide chutes, which are located on both sides of the conveyor belt.

5. The wastewater coagulation dissolved air flotation treatment equipment according to claim 1, characterized in that, A protective cover is installed above the scum collection pool.

6. The wastewater coagulation dissolved air flotation treatment equipment according to claim 1, characterized in that, The scraper and the rotating shaft are rotatably connected by a first shaft hinge. The hinge axis of the first shaft hinge is perpendicular to the rotating shaft. A first limiting body is provided at the end of the rotating shaft behind the scraper. The first limiting body makes the scraper only able to rotate forward and not backward.

7. The wastewater coagulation dissolved air flotation treatment equipment according to claim 6, characterized in that, The scraper includes a first plate and a second plate. The first plate is connected to the rotating shaft, and the second plate is rotatably connected to the first plate via a second shaft hinge. The density of the second plate is lower than that of the sewage in the scum pool. The first plate is provided with second baffles located on the front and rear sides of the second plate, and the included angle between the two second baffles is less than 90 degrees.

8. The wastewater coagulation dissolved air flotation treatment equipment according to claim 1, characterized in that, The scraper is a magnet.

9. The wastewater coagulation dissolved air flotation treatment equipment according to claim 1, characterized in that, The scraper is made of ferromagnetic material.

10. The wastewater coagulation dissolved air flotation treatment equipment according to claim 9, characterized in that, The guide groove is magnetic.

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