Scraper for wastewater treatment and air flotation device

Abstract

The invention relates to the technical field of sewage treatment, in particular to a scraper for wastewater treatment and an air floatation device, the scraper comprises a skimming assembly, a rotary drum, two groups of scrapers arranged on the rotary drum, and moving parts arranged on the scrapers; the moving part comprises a groove formed in the scraper, sliding grooves formed in the two side walls of the groove, a moving plate arranged on the groove, a movable groove formed in the bottom of the moving plate and a spring part arranged at the bottom of the moving plate. The movable plate is attached to the top of the scraping plate to move under the elastic potential energy of the spring piece; according to the skimming assembly, the moving plate is driven to rotate in a dynamic form in the rotating and scum scraping process of the scraping plate, and the problem that a large amount of water is synchronously brought into a collecting device when the skimming assembly scrapes and collects scum is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to a scraper and an air flotation device for wastewater treatment. Background Art

[0002] Shallow flotation, as a highly efficient water treatment technology, is widely used in various wastewater treatment scenarios to separate and remove pollutants such as suspended matter, oil, and colloids from the 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 skimmer assembly, with its compact structure, continuous operation, and high scraping efficiency, has become a key scum removal equipment in shallow flotation tanks.

[0003] The spiral skimmer assembly is usually driven by a motor to slowly rotate the spiral blade near the liquid surface, gradually pushing the scum toward the discharge end and scraping it into a collection trough or scum discharge pipe. However, in actual operation, the spiral blades inevitably disturb the water layer below it while scraping the scum. In addition, the scum itself has a certain degree of fluidity and is often surrounded by bubbles. As a result, when the spiral blades push the scum into the collection device (such as a scum discharge trough, scum discharge hopper or pipe), a large amount of water will be drawn into the collection device along with the scum. This not only significantly reduces the concentration of the collected scum (i.e., increases the moisture content), but also increases the difficulty and cost of subsequent scum treatment (such as dehydration and transportation). At the same time, it causes unnecessary loss of treated water, reduces the water recovery rate of the entire system, and may affect the effectiveness of subsequent treatment units. Summary of the Invention

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

[0005] In order to solve the deficiencies of the prior art, one object of the present invention is to provide a scraper and an air flotation device for wastewater treatment.

[0006] To achieve the above objectives, the present invention adopts the following technical solutions: 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 moving members disposed on the scrapers;

[0007] The moving member includes a groove formed on the scraper, sliding grooves formed on both side walls of the groove, a moving plate provided on the groove, a movable groove formed on the bottom of the moving plate, and a spring member provided on the bottom of the moving plate; the moving plate moves in contact with the top of the scraper under the elastic potential energy of the spring member;

[0008] Wherein, both ends of the side wall of the movable plate are arranged on the sliding grooves, and the distance between the two groups of the sliding grooves is smaller than the width of the movable plate.

[0009] As a preferred solution of the scraper for wastewater treatment of the present invention, two groups of cavities are opened on the rotating drum, and the scrapers are respectively arranged on the same side of the two groups of cavities.

[0010] As a preferred solution of the scraper for wastewater treatment of the present invention, the scraper is semi-arc-shaped, and the moving part is arranged on the central axis of the scraper.

[0011] As a preferred solution of the scraper for wastewater treatment of the present invention, rounded corners are provided on both sides of the groove, the movable plate is arranged above the rounded corners, and the bottom surface of the movable plate is in contact with the rounded corners.

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

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

[0014] As a preferred solution of the scraper for wastewater treatment described in the present invention, the chutes are all "L"-shaped, and the lengths of the long side segments of the two groups of chutes are different, wherein the long side segments in the "L"-shaped structure of the chutes are parallel to the inner surface of the side wall of the groove.

[0015] As a preferred embodiment of the scraper for wastewater treatment described in the present invention, the spring component includes a fixed block, a spring 1 and a push block, the fixed block is arranged on the bottom surface of the scraper, the push block is arranged on the bottom surface of the moving block, and the spring 1 is arranged between the fixed block and the push block.

[0016] As a preferred solution of the scraper for wastewater treatment of the present invention, the fixed block is arranged at one end of the scraper away from the drum, and the push block is arranged at the edge of the movable plate.

[0017] As a preferred embodiment of the flotation device of the present invention, it includes a pool body, an energy dissipation mechanism arranged on the pool body, a traveling frame arranged on the pool body, and a water distribution pipe arranged on the traveling frame, and the skimming assembly is arranged on one side of the water distribution pipe.

[0018] The scraper and flotation device for wastewater treatment of the present invention have beneficial effects: the present invention cooperates with the movable plate and the scraper to drive the movable plate to undergo dynamic shape reversal (from an upward convex semi-arc shape to a downward concave reverse semi-arc shape) during the scraper rotation and scraping process, which solves the problem that a large amount of water is synchronously brought into the collection device when the spiral skimming component scrapes and collects scum, so that the water accumulated on the movable plate can be effectively discharged through the channel generated by gravity and shape change, while ensuring that the scum is retained due to its greater density and friction resistance, and utilizing the steeper "slide" and lengthened displacement path formed by the reverse semi-arc structure to enhance the efficiency of conveying the scum to the drum cavity, facilitate subsequent high-concentration collection and treatment of the scum, significantly reduce the scum moisture content and treatment cost, and improve the system water recovery rate and operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the scraper and flotation device for wastewater treatment of the present invention.

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

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

[0023] Figure 4 This is a schematic structural 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 figure: 100, skimming assembly; 101, rotating drum; 102, scraper; 103, moving part; 103a, groove; 103b, slide; 103c, moving plate; 103d, movable groove; 103e, spring part; 101a, cavity; 103a-1, fillet; 103e-1, fixed block; 103e-2, spring 1; 103e-3, push block; 200, tank body; 201, energy dissipation mechanism; 202, traveling frame; 203, water distribution pipe. DETAILED DESCRIPTION

[0026] In order to make the objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" 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 various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0029] Reference Figure 1 and Figure 2 , which is the first embodiment of the present invention, provides a scraper 102 and a flotation device for wastewater treatment, which can increase the concentration of collected scum and reduce the difficulty and cost of subsequent scum treatment. The embodiment includes: a scum skimming assembly 100, including a rotating drum 101, two sets of scrapers 102 arranged on the rotating drum 101, the two sets of scrapers 102 are symmetrically distributed, and a moving part 103 provided 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 scum on the horizontal plane into the rotating drum 101, and then because the rotating drum 101 is arranged obliquely, the scum enters the rotating drum 101 and flows toward the lower end of the rotating drum 101.

[0030] The movable member 103 includes a groove 103a formed on the scraper 102, sliding grooves 103b formed on both side walls of the groove 103a, a movable plate 103c disposed on the groove 103a, a movable groove 103d formed on the bottom of the movable plate 103c and made of a flexible material, the movable groove 103d being provided to facilitate subsequent deformation of the movable plate 103c, and a spring member 103e disposed 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 member 103e;

[0031] The two ends of the side wall of the movable plate 103c are arranged on the sliding grooves 103b, and the distance between the two groups of sliding grooves 103b is smaller than the width of the movable plate 103c.

[0032] It can be seen that in the prior art, the scraper 102 inevitably disturbs the water layer below it while scraping the scum. In addition, the scum itself has a certain degree of fluidity and often contains bubbles. As a result, when the scraper 102 pushes the scum into the collection device, a large amount of water will be drawn into the collection device along with the scum. This not only significantly reduces the concentration of the collected scum (i.e., increases the moisture content), but also increases the difficulty and cost of subsequent scum processing (such as dehydration and transportation). The device solves this problem by providing a movable plate 103c and changing the position and state of the movable plate 103c.

[0033] Specifically, when the drum 101 is rotated by an external motor, the scraper 102 also rotates accordingly. Before the scraper 102 starts to scrape the foam, the movable plate 103c is located on the bottom surface of the scraper 102. At this time, the scraper 102 is inverted on the water surface with its arc surface facing downward. 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 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 the scum, and finally scrape the scum into the collection device.

[0034] In the process of the scraper 102 arc surface gradually changing to an upward state, the spring member 103e will push the movable plate 103c downward due to the action of elastic potential energy. At the same time, the movable plate 103c will change its shape under the guidance of the slide groove 103b. When the spring member 103e acts on the movable plate 103c, it pushes it to deform. As the extrusion force increases, the arc surface of the movable plate 103c gradually changes from an upward convex state to a state close to a plane, and finally completely reverses to form a downward concave reverse semi-arc structure. This process causes the movable plate 103c to change from the initial upward semi-arc shape to the final reverse semi-arc shape.

[0035] When movable plate 103c transforms into an inverted semi-arc shape, water accumulated on movable plate 103c flows out of grooves 103a. This design not only effectively removes excess water but also ensures that scum remains on movable plate 103c. During the initial phase of the shape change, the curved surface of movable plate 103c gradually flattens. At this point, water on movable plate 103c begins to flow outward due to gravity. When movable plate 103c transforms into an inverted semi-arc shape, grooves 103a are exposed, allowing the water to drain smoothly. However, scum, due to its higher density and greater friction with the surface of movable plate 103c, is less likely to slide off with the water flow and therefore remains on movable plate 103c. Through this ingenious structural design and movement, movable plate 103c simultaneously removes water while retaining scum on its surface, effectively separating scum from water. This separation mechanism not only improves scum collection efficiency but also reduces its water content, facilitating subsequent scum disposal.

[0036] Further, refer to Figure 2 The rotating drum 101 is provided with two groups of cavities 101a, and the scrapers 102 are respectively arranged on the same side of the two groups of cavities 101a.

[0037] Further, refer to Figure 4 The scraper 102 is semi-arc-shaped, and the moving member 103 is arranged 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, that is, the position of the moving plate 103c.

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

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

[0040] Further, refer to Figure 4 The distance from the bottom surface of the movable plate 103c to the top surface of the scraper 102 is less than the length of the shorter end of the chute 103b. When the movable plate 103c moves on the chute 103b, it can be ensured to be on the upper surface of the scraper 102.

[0041] Further, refer to Figure 5The sliding grooves 103b are both "L"-shaped, and the long side segments of the two groups of sliding grooves 103b are of different lengths. Among them, the long side segments in the "L"-shaped structure of the sliding grooves 103b are parallel to the inner surface of the side wall of the groove 103a. Since the two groups of sliding grooves 103b are of different lengths, the movable distance of the end of the movable plate 103c is also controlled by the sliding grooves 103b. For example, after one end of the movable plate 103c moves to the limit position, the other end still has room to move. When the other end continues to move, the shape of the movable plate 103c will change.

[0042] Further, refer to Figure 2 The spring member 103e includes a fixed block 103e-1, a spring 103e-2 and a push block 103e-3. The fixed block 103e-1 is arranged on the bottom surface of the scraper 102, the push block 103e-3 is arranged on the bottom surface of the moving block, and the spring 103e-2 is arranged between the fixed block 103e-1 and the push block 103e-3. In the process that the arc surface of the scraper 102 gradually changes to an upward state, the push block 103e-3 is below the fixed block 103e-1, and the end of the spring 103e-2 close to the push block 103e-3 has a larger mass. Since the end with larger mass is at the bottom, spring 103e-2 will generate an upward torque under the action of gravity, causing spring 103e-2 to apply thrust toward push block 103e-3. This thrust is transmitted to the movable plate 103c through push block 103e-3, prompting the movable plate 103c to start moving under the action of spring 103e-2.

[0043] The moving plate 103c moves along the chute 103b. First, the moving plate 103c is lifted a certain distance by the chute 103b, until its lower surface contacts the upper surface of the scraper 102. Then, the moving plate 103c continues to move along the curvature of the scraper 102. This process allows the moving plate 103c to closely conform to the curved surface of the scraper 102, pushing the scum on the scraper 102 into the cavity 101a.

[0044] Further, refer to Figure 3 The fixed block 103e-1 is set at one end of the scraper 102 away from the drum 101, and the push block 103e-3 is set at the edge of the movable plate 103c. The position of the fixed block 103e-1 allows the movable plate 103c to move better.

[0045] Further, refer to Figure 1The system comprises a tank body 200, an energy dissipation mechanism 201 mounted on the tank body 200, a traveling frame 202 mounted on the tank body 200, and a water distribution pipe 203 mounted on the traveling frame 202. The skimmer assembly 100 is mounted on one side of the water distribution pipe 203. During operation, wastewater flows through the water distribution pipe 203 and is evenly distributed to the bottom of the tank body 200. The energy dissipation mechanism 201 stabilizes the water flow and prevents eddies. The dissolved air system releases a large number of tiny bubbles within the tank body 200 and combines with suspended matter in the wastewater to form aerosols with a density lower than that of water. These aerosols rise rapidly to the surface under buoyancy, forming a scum layer. The skimmer assembly 100 moves along the traveling frame 202 on the side of the water distribution pipe 203, scraping the scum into a collection tank. The purified water is then discharged from the bottom of the tank body 200. The entire process, based on the "shallow pond theory" and the "zero-speed principle," achieves efficient solid-liquid separation, with short residence time, high treatment efficiency, and a compact footprint.

[0046] Working principle: When the drum 101 is driven to rotate by an external motor, the scraper 102 fixed thereto rotates synchronously; at the initial stage of rotation of the scraper 102, before it contacts the foam, the movable plate 103c is located on the bottom surface of the scraper 102, so that the scraper 102 as a whole is in an inverted posture, with its arc surface facing downward and immersed near the water surface; as the scraper 102 continues to rotate and begins to scrape the foam on the water surface, its arc surface posture gradually changes from downward to upward. When the scraper 102 rotates to a near-horizontal state, the water flow and the scum converge at the lowest point of the depression formed by the arc surface, where the scum is effectively intercepted and gathered; the gathered scum is transported into the internal cavity 101a of the drum 101 as the scraper 102 rotates, and is finally guided to a 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 work: when the scraper 102 is in a lower position, the push 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, spring 103e-2 applies an upward thrust to the push block 103e-3, and this force is transmitted to the movable plate 103c, driving it to start to move relative to the scraper 102; the movable plate 103c first gradually extends from its initial upward convex semi-arc shape to approach the plane. When one end of it moves to the limit, the other end continues to move, and finally drives the movable plate 103c to completely reverse its shape, forming a reverse semi-arc structure that is significantly concave downward. The reversal process is key to achieving water-slag separation: in the initial stage of the transition of the movable plate 103c from a convex arc to a flat surface and then to a concave arc, the water accumulated on its surface quickly 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; the scum, due to its relatively high density, high viscosity and large frictional resistance with the surface of the movable plate 103c, is not easily slipped away with the water flow, and thus can be effectively retained on the surface of the movable plate 103c.

[0048] First, the dynamic deformation design realizes the real-time separation of water and slag during the scraping process, greatly reduces the amount of water entering the collection device together with the slag, significantly improves the slag concentration (reduces the moisture content), directly reduces the subsequent dehydration processing load and cost, reduces the unnecessary loss of processed water, and improves the water recovery rate of the system; secondly, the reverse semi-arc structure finally formed by the movable plate 103c has a curvature generally designed to be greater than the arc surface of the scraper 102, which is not only conducive to water discharge, but also forms a more conducive slag to the drum 101 between the arc surface of the scraper 102 and the concave arc of the movable plate 103c. The "slide" flowing inside the cavity 101a, combined with the continuous pushing effect brought by the rotation of the scraper 102 and the extended displacement path of the movable plate 103c relative to the scraper 102, jointly generate a powerful coordinated conveying force, which significantly improves the efficiency and thoroughness of the scum gathering inside the rotating drum 101 and finally discharged into the collection device, and avoids the scum remaining in the device; furthermore, the entire water-slag separation and scum conveying process is completely realized by the linkage of the mechanical structure (rotation of the scraper 102, gravity, and spring force), without the need for additional power source or complex control system, and has a reliable structure, low energy consumption, and easy maintenance.

[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 the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A scraper for wastewater treatment, characterized in that: include, A slag skimming assembly (100) comprises a rotating drum (101), two groups of scrapers (102) arranged on the rotating drum (101), and a moving member (103) arranged on the scrapers (102); The moving member (103) comprises a groove (103a) provided on the scraper (102), sliding grooves (103b) provided on both side walls of the groove (103a), a moving plate (103c) provided on the groove (103a), a movable groove (103d) provided at the bottom of the moving plate (103c), and a spring member (103e) provided at the bottom of the moving plate (103c); the moving plate (103c) moves in contact with the top of the scraper (102) under the elastic potential energy of the spring member (103e); Wherein, both ends of the side wall of the movable plate (103c) are arranged on the sliding grooves (103b), and the distance between the two groups of the sliding grooves (103b) is smaller than the width of the movable plate (103c).

2. The scraper for wastewater treatment according to claim 1, wherein: The rotating drum (101) is provided with two groups of cavities (101a), and the scrapers (102) are respectively arranged on the same side of the two groups of cavities (101a).

3. The scraper for wastewater treatment according to claim 2, wherein: The scraper (102) is semi-arc-shaped, and the moving member (103) is arranged on the central axis of the scraper (102).

4. The scraper for wastewater treatment according to claim 3, wherein: Rounded corners (103a-1) are provided on both sides of the groove (103a), the movable plate (103c) is arranged above the rounded corners (103a-1), and the bottom surface of the movable plate (103c) is in contact with the rounded corners (103a-1).

5. The scraper for wastewater treatment according to claim 4, wherein: The movable plate (103c) is arc-shaped, and its cross section is the same as that of the groove (103a).

6. The scraper for wastewater treatment according to claim 5, characterized in that: The distance from the bottom surface of the movable plate (103c) to the top surface of the scraper (102) is smaller than the length of the shorter end of the chute (103b).

7. The scraper for wastewater treatment according to claim 5 or 6, characterized in that: The sliding grooves (103b) are all "L"-shaped, and the long side segments of the two groups of sliding grooves (103b) are different in length, wherein the long side segments in the "L"-shaped structure of the sliding grooves (103b) are parallel to the inner surface of the side wall of the groove (103a).

8. The scraper for wastewater treatment according to claim 7, wherein: The spring member (103e) comprises a fixed block (103e-1), a spring 1 (103e-2) and a push block (103e-3); the fixed block (103e-1) is arranged on the bottom surface of the scraper (102); the push block (103e-3) is arranged on the bottom surface of the moving block; and the spring 1 (103e-2) is arranged between the fixed block (103e-1) and the push block (103e-3).

9. The scraper for wastewater treatment according to claim 8, wherein: The fixed block (103e-1) is arranged at one end of the scraper (102) away from the rotating drum (101), and the pushing block (103e-3) is arranged at the edge of the movable plate (103c).

10. An air flotation device, using the scraper for wastewater treatment according to any one of claims 1 to 9, characterized in that: The invention comprises a tank body (200), an energy dissipation mechanism (201) arranged on the tank body (200), a traveling frame (202) arranged on the tank body (200), and a water distribution pipe (203) arranged on the traveling frame (202); the skimming assembly (100) is arranged on one side of the water distribution pipe (203).

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