A scraper and air float device for wastewater treatment

Abstract

This invention relates to the field of wastewater treatment technology, and in particular to a scraper and flotation device for wastewater treatment, comprising a skimming assembly including a rotating drum, two sets of scrapers disposed on the rotating drum, and a movable component disposed on the scrapers; the movable component includes a groove formed on the scraper, a sliding groove formed on both sides of the groove, a movable plate disposed on the groove, a movable slot formed at the bottom of the movable plate, and a spring component disposed at the bottom of the movable plate; the movable plate moves against the top of the scraper under the elastic potential energy of the spring component; this invention solves the problem that a large amount of water is simultaneously brought into the collection device when the skimming assembly scrapes and collects scum by driving the movable plate to dynamically reverse its shape during the scraping process of the scraper rotating.

Description

Technical Field

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

[0002] Shallow air flotation, as a highly efficient water treatment technology, is widely used in various wastewater treatment scenarios to separate and remove pollutants such as suspended solids, grease, and colloids from water. Its core lies in the adhesion of microbubbles to form a low-density scum layer that accumulates on the water surface. To effectively remove this scum layer, the spiral skimming component has become a key scum removal device in shallow air flotation tanks due to its compact structure, continuous operation, and high scum scraping efficiency.

[0003] Spiral skimming components typically use a drive motor to rotate spiral blades slowly near the liquid surface, gradually pushing scum towards the discharge end and scraping it into a collection tank or discharge pipe. However, in actual operation, the spiral blades inevitably disturb the water layer below the scum while scraping it. Furthermore, the scum itself has a certain fluidity and often contains air bubbles. This results in a large amount of water being drawn into the collection device (such as a discharge tank, discharge hopper, or pipe) along with the scum during the crucial stage of the spiral blades pushing the scum into the collection device. This not only significantly reduces the concentration of the collected scum (i.e., increases the water content), increasing the difficulty and cost of subsequent scum treatment (such as dewatering and transportation), but also causes unnecessary loss of treated water, reduces the overall system's water recovery rate, and may affect the effectiveness of subsequent treatment units. Summary of the Invention

[0004] In this section, as well as in the abstract and title of this application, some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract, and the title of this application, and such simplifications or omissions shall not be used to limit the scope of the invention.

[0005] To address the shortcomings of existing technologies, one objective of this invention is to provide a scraper and flotation device for wastewater treatment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a scraper and flotation device for wastewater treatment, comprising a skimming assembly, including a rotating drum, two sets of scrapers disposed on the rotating drum, and a movable component disposed on the scrapers;

[0007] The movable component includes a groove formed on the scraper, sliding grooves formed on both sides of the groove, a movable plate disposed on the groove, a movable groove formed on the bottom of the movable plate, and a spring disposed on the bottom of the movable plate; the movable plate moves against the top of the scraper under the elastic potential energy of the spring.

[0008] The two ends of the sidewall of the movable plate are set on the slide groove, and the distance between the two sets of slide grooves is less than the width of the movable plate.

[0009] As a preferred embodiment of the wastewater treatment scraper of the present invention, the rotating drum has two sets of cavities, and the scraper is respectively arranged on the same side of the two sets of cavities.

[0010] In a preferred embodiment of the wastewater treatment scraper of the present invention, the scraper is semi-arc-shaped, and the moving part is disposed on the central axis of the scraper.

[0011] In a preferred embodiment of the wastewater treatment scraper of the present invention, the groove has rounded corners on both sides, the movable plate is disposed above the rounded corners, and the bottom surface of the movable plate is in contact with the rounded corners.

[0012] In a preferred embodiment of the wastewater treatment scraper of the present invention, the movable plate is arc-shaped and its cross-section is the same as that of the groove.

[0013] In a preferred embodiment of the wastewater treatment scraper of the present invention, the distance from the bottom surface of the moving plate to the top surface of the scraper is less than the length of the shorter end of the chute.

[0014] As a preferred embodiment of the wastewater treatment scraper of the present invention, the chutes are all L-shaped, and the lengths of the long sides of the two sets of chutes are different. The long side of the L-shaped structure of the chutes is parallel to the inner surface of the side wall of the groove.

[0015] In a preferred embodiment of the wastewater treatment scraper of the present invention, the spring component includes a fixed block, a first spring, and a push block. The fixed block is disposed on the bottom surface of the scraper, the push block is disposed on the bottom surface of the moving block, and the first spring is disposed between the fixed block and the push block.

[0016] In a preferred embodiment of the wastewater treatment scraper of the present invention, the fixing block is disposed at the end of the scraper away from the rotating drum, and the push block is disposed at the edge of the moving plate.

[0017] As a preferred embodiment of the air flotation device of the present invention, it includes a tank body, an energy dissipation mechanism disposed on the tank body, a walking frame disposed on the tank body, and a water distribution pipe disposed on the walking frame, wherein the skimming component is disposed on one side of the water distribution pipe.

[0018] The beneficial effects of the scraper and flotation device for wastewater treatment of the present invention are as follows: The present invention, through the cooperation between the movable plate and the scraper, can drive the movable plate to undergo dynamic shape reversal (from an upwardly convex semi-arc shape to a downwardly concave reverse semi-arc shape) during the scraping of scum by the rotation of the scraper. This solves the problem that a large amount of water is simultaneously brought into the collection device when the spiral scum removal and collection assembly removes and collects scum. The water accumulated on the movable plate can be effectively discharged by gravity and the channel created by the shape change. At the same time, it ensures that the scum is retained due to its high density and frictional resistance. The steeper "slide" formed by the reverse semi-arc structure and the extended displacement path enhance the conveying efficiency of scum to the rotating cylinder cavity, which facilitates the subsequent high-concentration collection and treatment of scum. This significantly reduces the water content of scum and the treatment cost, and improves the system water recovery rate and operating efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the scraper and flotation device for wastewater treatment according to the present invention.

[0021] Figure 2 This is a schematic diagram of the three-dimensional structure of the scraper for wastewater treatment according to the present invention.

[0022] Figure 3 This is a schematic diagram of the cavity structure of the scraper for wastewater treatment according to the present invention.

[0023] Figure 4 This is a schematic diagram of the scraper skimming assembly for wastewater treatment according to the present invention.

[0024] Figure 5 For the present invention Figure 4 Enlarged view of point A.

[0025] In the diagram: 100, skimming assembly; 101, rotating drum; 102, scraper; 103, moving part; 103a, groove; 103b, chute; 103c, moving plate; 103d, movable groove; 103e, spring part; 101a, cavity; 103a-1, rounded corner; 103e-1, fixed block; 103e-2, spring one; 103e-3, push block; 200, pool body; 201, energy dissipation mechanism; 202, walking frame; 203, water distribution pipe. Detailed Implementation

[0026] To make the objectives, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0029] Reference Figure 1 and Figure 2 This is the first embodiment of the present invention. This embodiment provides a scraper 102 and an air flotation device for wastewater treatment, which can increase the concentration of collected scum and reduce the difficulty and cost of subsequent scum treatment. It includes: a scum skimming assembly 100, including a rotating drum 101, two sets of scrapers 102 disposed on the rotating drum 101, the two sets of scrapers 102 being symmetrically and mirror-distributed, and a moving part 103 disposed on the scraper 102; the edge of the scraper 102 is close to the horizontal plane, and when the scraper 102 rotates, it can collect the scum on the horizontal plane into the rotating drum 101. Since the rotating drum 101 is inclined, the scum flows towards the lower end of the rotating drum 101 after entering the rotating drum 101.

[0030] The movable component 103 includes a groove 103a formed on the scraper 102, a sliding groove 103b formed on both sides of the groove 103a, a movable plate 103c set on the groove 103a, the movable plate 103c being made of a flexible material, an active groove 103d formed at the bottom of the movable plate 103c, the active groove 103d being provided to facilitate subsequent deformation of the movable plate 103c, and a spring 103e set at the bottom of the movable plate 103c; the movable plate 103c moves against the top of the scraper 102 under the elastic potential energy of the spring 103e.

[0031] The two ends of the sidewall of the movable plate 103c are set on the slide groove 103b, and the distance between the two sets of slide grooves 103b is smaller than the width of the movable plate 103c.

[0032] As can be seen, in the prior art, the scraper 102 inevitably disturbs the water layer below the scum while scraping it. In addition, the scum itself has a certain fluidity and often contains air bubbles. As a result, a large amount of water is drawn into the collection device along with the scum during the critical step of the scraper 102 pushing the scum into the collection device. This not only significantly reduces the concentration of the collected scum (i.e., increases the water content), but also increases the difficulty and cost of subsequent scum treatment (such as dewatering and transportation). This device solves this problem by setting a moving plate 103c and changing the position and state of the moving plate 103c.

[0033] Specifically, when the rotating drum 101 rotates via an external motor, the scraper 102 also rotates accordingly. Before the scraper 102 begins to scrape off the scum, the moving plate 103c is located on the bottom surface of the scraper 102. At this time, the scraper 102 is upside down on the water surface with its arc surface facing down. As the scraper 102 gradually rotates, the arc surface of the scraper 102 gradually changes from the initial downward state to the upward state. The scum on the scraper 102 enters the rotating drum 101 as the scraper 102 rotates. This movement mode enables the scraper 102 to gradually collect the scum into the arc surface of the scraper 102 during the process of scraping off the scum, and finally scrape the scum into the collection device.

[0034] As the arc surface of scraper 102 gradually changes to an upward state, spring 103e will push moving plate 103c downward due to elastic potential energy. At the same time, under the guidance of slide groove 103b, moving plate 103c will change its shape. When spring 103e acts on moving plate 103c, it will push it to deform. As the extrusion pressure increases, the arc surface of moving plate 103c gradually changes from an upward convex state to a near-flat state, and finally completely reverses, forming a downward concave reverse semi-arc structure. This process makes moving plate 103c change from the initial upward semi-arc shape to the final reverse semi-arc shape.

[0035] When the movable plate 103c changes to a reverse semi-circular shape, the water accumulated on it flows away from the groove 103a. This design not only effectively removes excess water but also ensures that scum remains on the movable plate 103c. In the initial stage of the shape change, the curved surface of the movable plate 103c gradually flattens, and the water on it begins to flow outwards due to gravity. When the movable plate 103c changes to a reverse semi-circular shape, the groove 103a is exposed, allowing the water to drain smoothly. The scum, due to its higher density and greater friction with the surface of the movable plate 103c, is less likely to slide off with the water flow and thus remains on the movable plate 103c. Through this ingenious structural design and movement, the movable plate 103c removes water while retaining scum on its surface, effectively separating scum from water. This separation mechanism not only improves the efficiency of scum collection but also reduces the water content of the scum, facilitating subsequent scum treatment.

[0036] Furthermore, refer to Figure 2 The rotating drum 101 has two sets of cavities 101a, and the scraper 102 is respectively arranged on the same side of the two sets of cavities 101a.

[0037] Furthermore, refer to Figure 4 The scraper 102 is semi-arc-shaped, and the moving part 103 is set on the central axis of the scraper 102. After water and scum enter the scraper 102, due to the shape of the scraper 102, the scum and water will be at the lowest end of the scraper 102, which is the position of the moving plate 103c.

[0038] Furthermore, refer to Figure 4 The groove 103a has rounded corners 103a-1 on both sides. The movable plate 103c is positioned above the rounded corners 103a-1. The bottom surface of the movable plate 103c is in contact with the rounded corners 103a-1. The bottom surfaces at both ends of the movable plate 103c are in contact with the rounded corners 103a-1. At this time, the scraper 102 is in a closed state.

[0039] Furthermore, refer to Figure 2 The movable plate 103c is arc-shaped, and its cross-section is the same as that of the groove 103a. The movable plate 103c just fills the groove 103a and is flush with the surface of the scraper 102.

[0040] Furthermore, refer to Figure 4 The distance from the bottom surface of the moving plate 103c to the top surface of the scraper 102 is less than the length of the shorter end of the chute 103b, so that the moving plate 103c can be positioned on the upper surface of the scraper 102 when it moves on the chute 103b.

[0041] Furthermore, refer to Figure 5The slide grooves 103b are all L-shaped, and the lengths of the long sides of the two sets of slide grooves 103b are different. The long side of the L-shaped structure of the slide groove 103b is parallel to the inner surface of the side wall of the groove 103a. Since the lengths of the two sets of slide grooves 103b are different, the distance that the end of the moving plate 103c can move is also controlled by the slide groove 103b. For example, after one end of the moving plate 103c moves to the limit position, there is still room for the other end to move. When the other end continues to move, it will change the shape of the moving plate 103c.

[0042] Furthermore, refer to Figure 2 The spring component 103e includes a fixed block 103e-1, a spring 103e-2, and a push block 103e-3. The fixed block 103e-1 is disposed on the bottom surface of the scraper 102, the push block 103e-3 is disposed on the bottom surface of the moving block, and the spring 103e-2 is disposed between the fixed block 103e-1 and the push block 103e-3. During the process of the arc surface of the scraper 102 gradually changing to an upward state, the push block 103e-3 is located below the fixed block 103e-1, and the end of the spring 103e-2 near the push block 103e-3 has a larger mass. Since the heavier end is at the bottom, the spring 103e-2 will generate an upward torque under the action of gravity, causing the spring 103e-2 to exert a pushing force on the pusher block 103e-3. This pushing force is transmitted to the moving plate 103c through the pusher block 103e-3, causing the moving plate 103c to start moving under the force of the spring 103e-2.

[0043] The movement of the movable plate 103c occurs along the chute 103b. First, the movable plate 103c is raised a certain distance under the limiting action of the chute 103b until its lower surface contacts the upper surface of the scraper 102. Subsequently, the movable plate 103c continues to move along the arc of the scraper 102. This process allows the movable plate 103c to closely fit the arc surface of the scraper 102, which can push the scum on the scraper 102 into the cavity 101a.

[0044] Furthermore, refer to Figure 3 The fixing block 103e-1 is located at the end of the scraper 102 away from the rotating drum 101, and the push block 103e-3 is located at the edge of the moving plate 103c. The position of the fixing block 103e-1 allows the moving plate 103c to move better.

[0045] Furthermore, refer to Figure 1The system includes a pool body 200, an energy dissipation mechanism 201 mounted on the pool body 200, a traveling frame 202 mounted on the pool body 200, and a water distribution pipe 203 mounted on the traveling frame 202. A skimming component 100 is located on one side of the water distribution pipe 203. During operation, wastewater is evenly distributed at the bottom of the pool body 200 through the water distribution pipe 203. The energy dissipation mechanism 201 stabilizes the water flow and prevents eddies. Under the action of the dissolved air system, a large number of microbubbles are released within the pool body 200 and combine with suspended solids in the wastewater to form an air flotation body with a density less than water. These air flotation bodies quickly rise to the water surface under buoyancy, forming a scum layer. The skimming component 100 moves along the traveling frame 202 on one side of the water distribution pipe 203, scraping the scum into a collection tank, while the purified water is discharged from the bottom of the pool body 200. The entire process is based on the "shallow pool theory" and the "zero velocity principle," achieving efficient solid-liquid separation with characteristics such as short residence time, high processing efficiency, and small footprint.

[0046] Working principle: When the rotating drum 101 is driven to rotate by an external motor, the scraper 102 fixed to it rotates synchronously. When the scraper 102 has not yet come into contact with the foam at the beginning of its rotation, the moving plate 103c is located on the bottom surface of the scraper 102, so that the scraper 102 is in an inverted position with its arc surface facing down and submerged near the water surface. As the scraper 102 continues to rotate and begins to scrape the foam on the water surface, its arc surface gradually changes from facing down to facing up. When the scraper 102 rotates to a near-horizontal state, the water flow and scum converge at the lowest point of the depression formed by the arc surface, and the scum is effectively intercepted and gathered here. The gathered scum is transported into the internal cavity 101a of the rotating drum 101 as the scraper 102 rotates, and is finally guided to the collection device for discharge.

[0047] During this process, as the arc surface of the scraper 102 flips from bottom to top, the built-in skimming component 100 of the device begins to function: when the scraper 102 is in a lower position, the pusher block 103e-3 is located below the fixed block 103e-1, and the counterweight end of the spring naturally droops due to gravity. In this state, the spring 103e-2 applies an upward pushing force to the pusher block 103e-3, which is transmitted to the moving plate 103c, driving it to begin to move relative to the scraper 102. The moving plate 103c first gradually extends from its initial upward convex semi-arc shape to approach the plane. When one end moves to the limit, the other end continues to move, eventually driving the shape of the moving plate 103c to completely reverse, forming a significantly downward concave reverse semi-arc structure. The reversal process is key to achieving water-slag separation: in the initial stage of the transition of the moving plate 103c from a convex arc to a flat plane and then to a concave arc, the water accumulated on its surface rapidly diffuses and flows away due to gravity; when a stable downward-concave reverse semi-arc shape is finally formed, the groove 103a ensures that the water is completely discharged; while the scum, due to its relatively high density, high viscosity and large frictional resistance with the surface of the moving plate 103c, is not easy to slip off with the water flow, and can therefore be effectively retained on the surface of the moving plate 103c.

[0048] First, this dynamic deformation design enables real-time water-slag separation during the slag scraping process, significantly reducing the amount of water entering the collection device along with the slag, significantly increasing the slag concentration (reducing the water content), directly reducing the load and cost of subsequent dewatering treatment, minimizing unnecessary water loss, and improving the system's water recovery rate. Second, the reverse semi-circular structure ultimately formed by the moving plate 103c typically has a curvature designed to be greater than that of the scraper 102's arc surface. This not only facilitates water drainage but also creates a more favorable environment between the arc surface of the scraper 102 and the concave arc of the moving plate 103c, allowing the slag to move towards the rotating drum 101. The "slide" flowing inside the cavity 101a, combined with the continuous pushing effect of the scraper 102's rotation and the extended displacement path of the moving plate 103c relative to the scraper 102, jointly generates a powerful synergistic conveying force, significantly improving the efficiency and thoroughness of scum gathering inside the rotating drum 101 and finally being discharged into the collection device, thus avoiding scum residue in the device. Furthermore, the entire water-scum separation and scum conveying process relies entirely on the linkage of mechanical structures (rotation of scraper 102, gravity, and spring force), requiring no additional power source or complex control system, making it structurally reliable, energy-efficient, and easy to maintain.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An air flotation device, characterized in that: It includes a pool body (200), an energy dissipation mechanism (201) disposed on the pool body (200), a walking frame (202) disposed on the pool body (200), and a water distribution pipe (203) disposed on the walking frame (202). The slag skimming assembly (100) is disposed on one side of the water distribution pipe (203). The skimming assembly (100) includes a rotating drum (101), two sets of scrapers (102) disposed on the rotating drum (101), and a movable part (103) disposed on the scrapers (102). The movable component (103) includes a groove (103a) formed on the scraper (102), a sliding groove (103b) formed on both sides of the groove (103a), a movable plate (103c) provided on the groove (103a), a movable groove (103d) formed at the bottom of the movable plate (103c), and a spring (103e) provided at the bottom of the movable plate (103c); the movable plate (103c) moves against the top of the scraper (102) under the elastic potential energy of the spring (103e); The two ends of the sidewall of the movable plate (103c) are set on the slide groove (103b), and the distance between the two sets of slide grooves (103b) is less than the width of the movable plate (103c).

2. The air flotation device as described in claim 1, characterized in that: The rotating drum (101) has two sets of cavities (101a), and the scraper (102) is respectively arranged on the same side of the two sets of cavities (101a).

3. The air flotation device as described in claim 2, characterized in that: The scraper (102) is semi-arc-shaped, and the moving part (103) is arranged on the central axis of the scraper (102).

4. The air flotation device as described in claim 3, characterized in that: The groove (103a) has rounded corners (103a-1) on both sides, and the movable plate (103c) is positioned above the rounded corners (103a-1). The bottom surface of the movable plate (103c) is in contact with the rounded corners (103a-1).

5. The air flotation device as described in claim 4, characterized in that: The movable plate (103c) is arc-shaped, and its cross-section is the same as that of the groove (103a).

6. The air flotation device as described in claim 5, characterized in that: The distance from the bottom surface of the moving plate (103c) to the top surface of the scraper (102) is less than the length of the shorter end of the chute (103b).

7. The air flotation device as described in claim 5 or 6, characterized in that: The grooves (103b) are all L-shaped, and the lengths of the long sides of the two sets of grooves (103b) are different. The long side of the L-shaped structure of the groove (103b) is parallel to the inner surface of the side wall of the groove (103a).

8. The air flotation device as described in claim 7, characterized in that: The spring component (103e) includes a fixed block (103e-1), a spring (103e-2), and a push block (103e-3). The fixed block (103e-1) is disposed on the bottom surface of the scraper (102), the push block (103e-3) is disposed on the bottom surface of the moving block, and the spring (103e-2) is disposed between the fixed block (103e-1) and the push block (103e-3).

9. The air flotation device as described in claim 8, characterized in that: The fixing block (103e-1) is located at one end of the scraper (102) away from the rotating drum (101), and the push block (103e-3) is located at the edge of the moving plate (103c).

Images