Wastewater purification device

Abstract

The invention discloses a wastewater purification device, and relates to the technical field of wastewater purification, the wastewater purification device comprises a support frame body, a sand discharge groove, a water inlet and a water outlet, the support frame body is provided with a sand filtering mechanism, one side of the sand filtering mechanism is provided with the sand discharge groove, one side of the support frame body is provided with the water inlet, and the other side of the support frame body is provided with the water outlet. A water outlet is formed in the other side of the supporting frame body, the supporting frame body comprises a supporting top plate, an inclined plate is fixedly connected to one side of the supporting top plate, a side plate is arranged on one side of the inclined plate, and a supporting bottom plate is installed on the side, away from the supporting top plate, of the inclined plate. By arranging the sand filtering mechanism, silt in wastewater is rapidly filtered, the problem of silt deposition caused by the fact that gravel blocks meshes is avoided, the density sedimentation characteristic of gravel soil in water flow is utilized, the gravel is filtered through a step structure formed by a plurality of net barrels, the net barrels are driven to rotate in cooperation with a water body, and the effect of filtering the silt is achieved. And the spiral scraping plate rotates to transversely push the gravel at the bottom, and the gravel is separated and taken out.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, in particular to a wastewater purification device. Background Art

[0002] Wastewater purification technology is particularly important. Sediment treatment is a key component of wastewater purification systems. The presence of sediment not only affects wastewater cleanliness but also interferes with subsequent treatment processes. Sediment accumulation can easily affect treatment efficiency in sedimentation and filtration. Therefore, developing effective sediment treatment technology is crucial to improving the overall performance of wastewater treatment systems.

[0003] Traditional sediment treatment methods rely primarily on physical sedimentation and filtration, where gravity causes heavier sediment to settle to the bottom, thereby separating it from clean water. However, this method often fails to achieve the desired effect when handling large volumes or high sediment concentrations, and requires regular manual cleaning, increasing operational costs. To overcome these challenges, advanced sediment treatment technologies are employed, including flotation separation, membrane filtration, and biological treatment. However, flotation separation and membrane filtration have limitations. When filtering large amounts of water, the filtered sediment is deposited within the treatment device, making sediment treatment more difficult and increasing processing costs.

[0004] Referring to the existing stepped arrangement of sand filter screens, the free flow of water under gravity is used to treat the sediment in the water body. However, the meshes in the screen are easily affected by the sediment and cannot continuously and efficiently filter and separate the sediment. After being blocked, the sediment is likely to accumulate, affecting the continuous operation of the screen. Therefore, a wastewater purification device is introduced. Summary of the Invention

[0005] The object of the present invention is to provide a wastewater purification device to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A wastewater purification device comprises a supporting frame, a sand discharge trough, a water inlet and a drain outlet, wherein the supporting frame is provided with a sand filtering mechanism, a sand discharge trough is installed on one side of the sand filtering mechanism, a water inlet is provided on one side of the supporting frame, and a drain outlet is provided on the other side of the supporting frame;

[0008] The support frame includes a support top plate, a slanted plate is fixedly connected to one side of the support top plate, a side plate is provided on one side of the slanted plate, and a support bottom plate is installed on the side of the slanted plate away from the support top plate;

[0009] The sand filtering mechanism includes a central rotating shaft, one end of the central rotating shaft is movably connected to the side plate, one end of the central rotating shaft is connected to a fixed horizontal plate, one side of the fixed horizontal plate is fixedly connected to a mesh cylinder, the outer wall of the mesh cylinder is provided with a fixed clip, and the inner wall of the mesh cylinder is provided with a spiral scraper.

[0010] The water inlet is connected to the top support plate, and the drain outlet is connected to the bottom support plate. The inclined plate is tilted relative to the horizontal plane. The water inlet is located at the highest point of the inclined plate, and the drain outlet is located at the lowest point of the inclined plate. Sewage is injected into the inclined plate through the water inlet, where it is filtered by the sand filter mechanism on the inclined plate. The filtered water flows out through the drain outlet along the inclined surface of the inclined plate.

[0011] Several mesh cylinders are provided, equidistantly and parallely distributed about the upper surface of the inclined plate. The mesh cylinders are arranged on the inclined plate in descending order of mesh size. The mesh cylinders on the inclined plate are arranged in an orderly fashion according to mesh size. The larger mesh cylinders are positioned on the side of the inclined plate near the water inlet. Sewage passes through the mesh cylinders, while the larger mesh cylinders filter larger sand and gravel impurities. The water is filtered through the mesh cylinders, sequentially filtering sand and gravel particles of varying sizes. This prevents blockage caused by accumulation of sand and gravel of varying sizes on the mesh surface, ensuring efficient sewage flow filtration.

[0012] Several fixed transverse plates are provided, equidistantly distributed in a circular pattern about the center point of the central rotating shaft. Sewage flows through the water inlet onto the inclined plates, flushing the mesh cylinders mounted on them. The fixed transverse plates installed within the mesh cylinders and the flow of water form a waterwheel structure. The water flushes the fixed transverse plates, which in turn drives the central rotating shaft, which in turn drives the mesh cylinders, removing sand and gravel trapped between the inclined plates and the mesh cylinders. After the water flows through the mesh cylinders, it flushes the deflected mesh cylinders, generating an outward thrust on the sand and gravel on them, clearing any adhering sand and gravel, achieving a self-cleaning effect. Smaller sand and gravel flow along with the sewage to the next mesh cylinder for filtration and cleaning.

[0013] The upper surface of the inclined plate is provided with a groove, the inner wall of which is configured as an arc and connected to the mesh cylinder. The surface of the inclined plate coincides with the center of the mesh cylinder cross section. Several equally spaced mesh cylinders and the inclined plate form a stepped screening structure. Sewage is filtered through the mesh cylinders in sequence and then continues to flow and filter downward along the inclined surface of the inclined plate. Due to the gravity density characteristics of sand and gravel, the sand and gravel are located at the bottom of the flowing water body. The mesh cylinder filters the sand and gravel at the bottom, and the relatively pure supernatant overflows the horizontal tangent of the top of the mesh cylinder, allowing the water to flow to the side of the next mesh cylinder for filtration. The cylindrical structure of the mesh cylinder reduces the filtration pressure of each step of the stepped structure, improving filtration efficiency. The sand and gravel filtered by the mesh cylinder falls into the filter pool formed by the mesh cylinder and grooves, while the heavier sand and gravel settles in the grooves for collection and treatment.

[0014] The spiral scraper is spirally wound around the inner wall of the mesh drum. One side of the mesh drum penetrates the side plate and connects to the sand discharge chute. The spiral scraper rotates synchronously with the mesh drum. The spiral scraper uses the spiral angle to act on the sand and gravel deposited in the groove. The spiral scraper applies horizontal thrust to the sand and gravel settled on the inner wall of the mesh drum, pushing the sand and gravel into the sand discharge chute, facilitating centralized sand and gravel processing.

[0015] A gap is provided between the mesh cylinder and the inner wall of the groove. Three fixing clips are provided, equidistantly arranged around the outer wall of the mesh cylinder. One side of each clip fits against the inner wall of the groove. The gap between the mesh cylinder and the groove reduces abrasion of the outer wall of the mesh cylinder by sand and gravel during its rotation. The fixing clips, along with the rotation of the mesh cylinder, remove fine sand deposited between the groove and the mesh cylinder, ensuring a clean environment for the mesh cylinder's rotation and extending its service life.

[0016] A rotation speed meter is provided on one side of the net cylinder through the central rotating shaft, and the water inlet is connected to an electric control valve. A control system is formed between the rotation speed meter and the electric control valve. The wastewater flow at the water inlet is controlled by an electric control valve. By observing the rotation speed of the central shaft and comparing the rotation speeds of the mesh drums with different mesh sizes, the proportion of sand and gravel components in the sewage can be learned. When the mesh drum with a larger mesh size rotates slowly, it means that large-particle sand and gravel account for a larger proportion in the sewage. The electric control valve at the water inlet is controlled to increase the flow rate, speed up the flushing of the mesh drum with a larger mesh size, and at the same time speed up the rotation of the mesh drum to speed up the removal of large-particle sand and gravel filtered inside into the sand discharge trough to avoid large-particle sand and gravel blocking the mesh drum. When the mesh drum with a smaller mesh size rotates slowly, it means that small-particle sand and gravel account for a larger proportion in the sewage. The electric control valve at the water inlet is controlled to reduce the flow rate, slow down the flushing of the mesh drum with a smaller mesh size, and at the same time slow down the rotation of the mesh drum to delay the removal of small-particle sand and gravel filtered inside into the sand discharge trough to avoid small-particle sand and gravel passing over the top of the mesh drum, thereby ensuring sufficient filtration and purification of sand and gravel in the sewage.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0018] The present invention quickly filters the sediment in the wastewater through the provided sand filtering mechanism, thereby avoiding the problem of sediment accumulation caused by sand and gravel blocking the mesh holes. The density sedimentation characteristics of sand and gravel in the water flow are utilized to filter the sand and gravel through a stepped structure composed of multiple mesh cylinders. The driving force generated by the water flow drives the mesh cylinder to rotate, thereby avoiding sand and gravel accumulation. The water body drives the rotation of the spiral scraper to push the sand and gravel at the bottom laterally, and the sand and gravel are separated and taken out. According to the rotation speed of the mesh cylinder with different mesh diameters, the particle size content of sand and gravel in the wastewater is analyzed, the wastewater flow is regulated, and the wastewater is effectively filtered and purified with sand and gravel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a side cross-sectional structural schematic diagram of the present invention;

[0022] Figure 3 It is a side structural schematic diagram of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the sand filtering mechanism of the present invention;

[0024] Figure 5 It is a schematic diagram of the cross-sectional structure of the sand filtering mechanism of the present invention.

[0025] In the picture:

[0026] 1. Support frame; 101. Support top plate; 102. Inclined plate; 1021. Groove; 103. Side plate; 104. Support bottom plate; 105. Speed ​​tachometer;

[0027] 2. Sand filter mechanism; 201. Central rotating shaft; 202. Fixed horizontal plate; 203. Net cylinder; 204. Fixed clamping strip; 205. Spiral scraper;

[0028] 3. Sand discharge trough;

[0029] 4. Water inlet;

[0030] 5. Drain outlet. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figure 1-Figure 5 , the present invention provides a technical solution:

[0033] A wastewater purification device includes a support frame 1, a sand discharge trough 3, a water inlet 4 and a drain outlet 5. The support frame 1 is provided with a sand filtering mechanism 2, and the sand discharge trough 3 is installed on one side of the sand filtering mechanism 2. The water inlet 4 is provided on one side of the support frame 1, and the drain outlet 5 is provided on the other side of the support frame 1;

[0034] The support frame 1 includes a support top plate 101, a slanted plate 102 is fixedly connected to one side of the support top plate 101, a side plate 103 is provided on one side of the slanted plate 102, and a support bottom plate 104 is installed on the side of the slanted plate 102 away from the support top plate 101;

[0035] The sand filtering mechanism 2 includes a central rotating shaft 201, one end of which is movably connected to the side plate 103, one end of which is connected to a fixed horizontal plate 202, one side of which is fixedly connected to a mesh cylinder 203, the outer wall of the mesh cylinder 203 is provided with a fixed clip 204, and the inner wall of the mesh cylinder 203 is provided with a spiral scraper 205.

[0036] A groove 1021 is provided on the upper surface of the inclined plate 102 . The inner wall of the groove 1021 is configured to be arc-shaped, and the inner wall of the groove 1021 is connected to the net cylinder 203 . The surface of the inclined plate 102 coincides with the center of the cross section of the mesh cylinder 203. A stepped screening structure is formed between several equidistantly distributed mesh cylinders 203 and the inclined plate 102. The sewage is filtered through the mesh cylinder 203 in turn, and then continues to flow and filter downward along the inclined surface of the inclined plate 102. According to the gravity density characteristics of the sand and gravel, the sand and gravel are at the bottom layer of the flowing water body. The sand and gravel at the bottom layer are filtered by the mesh cylinder 203, and the relatively pure upper clear liquid overflows the horizontal tangent of the top of the mesh cylinder 203, causing the water body to flow to the side of the next mesh cylinder for filtration. The cylindrical structure of the mesh cylinder 203 is used to reduce the filtration pressure of each step structure and improve the filtration efficiency. The sand and gravel filtered by the mesh cylinder 203 fall into the filter pool formed by the mesh cylinder 203 and the groove 1021, and the heavier sand and gravel settle in the groove 1021 for collection and treatment.

[0037] The spiral scraper 205 is spirally wound around the inner wall of the mesh cylinder 203. One side of the mesh cylinder 203 passes through the side plate 103 and is connected to the sand discharge chute 3. The spiral scraper 205 rotates synchronously with the mesh cylinder 203. The spiral scraper 205 uses the spiral angle to act on the sand and gravel deposited in the groove 1021. The spiral scraper 205 applies horizontal thrust to the sand and gravel settled on the inner wall of the mesh cylinder 203, pushing the sand and gravel into the sand discharge chute 3 by the spiral scraper 205, facilitating centralized processing of the sand and gravel.

[0038] A gap is provided between the net cylinder 203 and the inner wall of the groove 1021. Three fixing clips 204 are provided, equidistantly arranged around the outer wall of the net cylinder 203. One side of the fixing clips 204 is in contact with the inner wall of the groove 1021. The gap provided between the net cylinder 203 and the groove 1021 reduces abrasion of the outer wall of the net cylinder 203 by sand and gravel during its rotation. The fixing clips 204, as the net cylinder 203 rotates, remove fine sand deposited between the groove 1021 and the net cylinder 203, ensuring a clean environment for the net cylinder 203's rotation and extending its service life.

[0039] A plurality of mesh cylinders 203 are provided, equidistantly and parallel to the upper surface of the inclined plate 102. The mesh cylinders 203 are arranged on the inclined plate 102 in descending order of mesh size. The mesh cylinders 203 on the inclined plate 102 are arranged in an orderly fashion according to mesh size. The mesh cylinders 203 with larger mesh sizes are positioned on the side of the inclined plate 102 near the water inlet 4. Sewage passes through the mesh cylinders 203, and the mesh cylinders 203 with larger mesh diameters filter out larger sand and gravel impurities. The water is filtered through the mesh cylinders 203, filtering sand and gravel particles of different sizes sequentially. This prevents blockage caused by the accumulation of sand and gravel of multiple sizes on the mesh surface, ensuring efficient flow and filtration of sewage.

[0040] A plurality of fixed transverse plates 202 are provided, and are equidistantly distributed in a circle about the center point of the central rotating shaft 201. Sewage flows through the water inlet 4 onto the inclined plate 102, flushing the mesh cylinder 203 on the inclined plate 102. The fixed transverse plates 202 installed inside the mesh cylinder 203 and the water flow form a waterwheel structure. The water flow flushes the fixed transverse plates 202, which drives the central rotating shaft 201 to rotate. The central rotating shaft 201 also drives the mesh cylinder 203 to rotate, removing sand and gravel trapped between the inclined plate 102 and the mesh cylinder 203. After the water flows through the mesh cylinder 203, it flushes the deflected mesh cylinder 203, generating an inward-outward thrust on the sand and gravel on the mesh cylinder 203, clearing away any sand and gravel stuck to the mesh cylinder 203 and achieving a self-purification effect. Smaller sand and gravel flow along with the sewage to the next mesh cylinder 203 for filtration and cleaning.

[0041] The water inlet 4 is connected to the support top plate 101, and the drain outlet 5 is connected to the support bottom plate 104. The inclined plate 102 is tilted relative to the horizontal plane. The water inlet 4 is located at the highest point of the inclined plate 102, and the drain outlet 5 is located at the lowest point of the inclined plate 102. Sewage is injected into the inclined plate 102 through the water inlet 4. The sand filter 2 on the inclined plate 102 filters the sediment. The filtered water flows along the inclined surface of the inclined plate 102 through the drain outlet 5.

[0042] A rotation speed meter 105 is provided on one side of the net cylinder 203 through the central rotating shaft 201, and the water inlet 4 is connected to an electric control valve. The rotation speed meter 105 and the electric control valve constitute a control system.

[0043] In one embodiment, the control system controls the sand and gravel filtration in the wastewater based on the speed meter 105 and the electronically controlled valve;

[0044] Specifically, the electric control valve controls the wastewater flow rate at the water inlet 4. By observing the rotation speed of the central rotating shaft 201 and comparing the rotation speeds of the mesh drum 203 with different mesh sizes, the proportion of sand and gravel components in the wastewater can be determined.

[0045] Furthermore, the rotation speed of the net drum 203 at normal flow rate is set to a, the rotation speed of the net drum 203 with larger mesh size on the inclined plate 102 is set to b, and the rotation speed of the net drum 203 with smaller mesh size is set to c;

[0046] When b is less than a, the sand and gravel block the surface of the net cylinder 203 and hinder the flow of water, indicating that the sewage contains a large proportion of large sand and gravel. The electric control valve of the water inlet 4 is controlled to increase the flow rate, accelerate the scouring of the net cylinder 203 by the water body, accelerate the rotation of the net cylinder 203, and accelerate the removal of large sand and gravel filtered inside to the sand discharge trough 3, thereby preventing large sand and gravel from blocking the net cylinder 203.

[0047] When c is less than a, it means that small particles of sand and gravel account for a large proportion in the sewage. The electric control valve of the water inlet 4 is controlled to reduce the flow rate, slow down the scouring of the mesh tube 203 with smaller mesh size, and at the same time slow down the rotation of the mesh tube 203, delaying the discharge of small particles of sand and gravel filtered inside to the sand discharge trough 3, avoiding small particles of sand and gravel from crossing the top of the mesh tube 203, and ensuring sufficient filtration and purification of sand and gravel in the sewage.

[0048] Working principle of the present invention:

[0049] First, the water inlet 4 is set at the highest point of the inclined plate 102, and the drain outlet 5 is set at the lowest point of the inclined plate 102. Sewage is injected into the inclined plate 102 through the water inlet 4, and the sediment is filtered by the sand filter 2 on the inclined plate 102. The filtered water flows out through the drain outlet 5 along the inclined surface of the inclined plate 102.

[0050] On the inclined plate 102 for filtering sand and gravel, the mesh cylinders 203 are arranged in order according to the mesh size. The mesh cylinder 203 with a larger mesh size is set on the side of the inclined plate 102 close to the water inlet 4. The sewage passes through the mesh cylinder 203. The mesh cylinder 203 with a larger mesh diameter filters the sand and gravel impurities with larger particle sizes. The water body is filtered through the mesh cylinder 203, and sand and gravel particles of different sizes are filtered in turn to avoid blockage caused by the accumulation of sand and gravel of multiple sizes on the mesh surface.

[0051] When sewage flows on the inclined plate 102 through the water inlet 4, the sewage flushes the mesh cylinder 203 on the inclined plate 102. The fixed transverse plate 202 arranged inside the mesh cylinder 203 and the flow of water form a waterwheel structure. The water flow flushes the fixed transverse plate 202, and the fixed transverse plate 202 drives the central rotating shaft 201 to rotate. The central rotating shaft 201 also drives the mesh cylinder 203 to rotate, taking away the sand and gravel trapped between the inclined plate 102 and the mesh cylinder 203. After the water flows through the mesh cylinder 203, it flushes the mesh cylinder 203 at the deflection angle, generates an inside-out thrust on the sand and gravel on the mesh cylinder 203, cleans the sand and gravel stuck on the mesh cylinder 203, and achieves a self-purification effect. The smaller sand and gravel flow along the sewage to the next mesh cylinder 203 for filtration and cleaning. The surface of the inclined plate 102 and the mesh cylinder 203 intersect The centers of the circles of the two surfaces coincide, and a stepped screening structure is formed between a number of equally spaced mesh cylinders 203 and the inclined plate 102. The sewage is filtered through the mesh cylinders 203 in sequence, and then continues to flow and filter downward along the inclined surface of the inclined plate 102. According to the gravity density characteristics of the sand and gravel, the sand and gravel are at the bottom of the flowing water body. The mesh cylinder 203 filters the sand and gravel at the bottom, and the relatively pure supernatant overflows the horizontal tangent of the top of the mesh cylinder 203, causing the water body to flow to the side of the next mesh cylinder for filtration. The cylindrical structure of the mesh cylinder 203 is used to reduce the filtration pressure of each step structure and improve the filtration efficiency. The sand and gravel filtered by the mesh cylinder 203 falls into the filtration pool formed by the mesh cylinder 203 and the groove 1021, and the heavier sand and gravel settles in the groove 1021 for collection and treatment;

[0052] As the net drum 203 rotates, the gap provided between the net drum 203 and the groove 1021 reduces the wear of the outer wall of the net drum 203 by sand and gravel during the rotation of the net drum 203. The fixed clip 204 rotates with the net drum 203 to remove the fine sand deposited between the groove 1021 and the net drum 203, thereby ensuring the cleanliness of the rotating environment of the net drum 203 and extending the service life of the net drum 203.

[0053] After the sand and gravel settle in the groove 1021, the spiral scraper 205 rotates synchronously with the rotation of the net cylinder 203. The spiral scraper 205 uses the spiral angle to act on the sand and gravel deposited in the groove 1021. The spiral scraper 205 applies horizontal thrust to the sand and gravel settled on the inner wall of the net cylinder 203, so that the sand and gravel are pushed by the spiral scraper 205 to the sand discharge trough 3 for centralized processing;

[0054] During the purification process, the rotation speed of the central rotating shaft 201 is observed by the speed meter 105, and the rotation speeds of the net cylinders 203 with different mesh sizes are compared. When the rotation speed of the net cylinder 203 with a larger mesh size is slower, it indicates that the large-particle sand and gravel account for a larger proportion in the sewage. The electric control valve of the water inlet 4 is controlled to increase the flow rate, speed up the flushing of the net cylinder 203 with a larger mesh size, and at the same time speed up the rotation of the net cylinder 203, speed up the removal of the large-particle sand and gravel filtered inside into the sand discharge trough 3, and avoid the large-particle sand and gravel blocking the net cylinder 203. When the rotation speed of the net cylinder 203 with a smaller mesh size is slower, it indicates that the small-particle sand and gravel account for a larger proportion in the sewage. The electric control valve of the water inlet 4 is controlled to reduce the flow rate, slow down the flushing of the net cylinder 203 with a smaller mesh size, and at the same time slow down the rotation of the net cylinder 203, delay the removal of the small-particle sand and gravel filtered inside into the sand discharge trough 3, and avoid the small-particle sand and gravel passing over the top of the net cylinder 203, thereby ensuring sufficient filtration and purification of the sand and gravel in the sewage.

[0055] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0056] Finally, it should be noted that the above descriptions are merely preferred embodiments 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 aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A wastewater purification device, comprising a support frame (1), a sand discharge trough (3), a water inlet (4) and a drain outlet (5), characterized in that: A sand filtering mechanism (2) is provided on the support frame (1), a sand discharge trough (3) is installed on one side of the sand filtering mechanism (2), a water inlet (4) is provided on one side of the support frame (1), and a water outlet (5) is provided on the other side of the support frame (1); The support frame (1) comprises a support top plate (101), a slanted plate (102) is fixedly connected to one side of the support top plate (101), a side plate (103) is provided on one side of the slanted plate (102), and a support bottom plate (104) is installed on the side of the slanted plate (102) away from the support top plate (101); The sand filtering mechanism (2) comprises a central rotating shaft (201), one end of the central rotating shaft (201) is movably connected to the side plate (103), one end of the central rotating shaft (201) is connected to a fixed transverse plate (202), one side of the fixed transverse plate (202) is fixedly connected to a net cylinder (203), the outer wall of the net cylinder (203) is provided with a fixed clamping strip (204), and the inner wall of the net cylinder (203) is provided with a spiral scraper (205).

2. A wastewater purification device according to claim 1, characterized in that: The water inlet (4) is connected to the supporting top plate (101), the water outlet (5) is connected to the supporting bottom plate (104), and the inclined plate (102) is arranged to be inclined relative to the horizontal plane.

3. A wastewater purification device according to claim 1, characterized in that: A plurality of the mesh cylinders (203) are provided, and the plurality of the mesh cylinders (203) are distributed equidistantly and parallelly on the upper surface of the inclined plate (102). The plurality of the mesh cylinders (203) are arranged on the inclined plate (102) in order from large to small according to mesh size.

4. A wastewater purification device according to claim 1, characterized in that: A plurality of the fixed transverse plates (202) are provided, and the plurality of the fixed transverse plates (202) are distributed in an annular manner with equal distances about the center point of the central rotation axis (201).

5. A wastewater purification device according to claim 1, characterized in that: A groove (1021) is provided on the upper surface of the inclined plate (102), the inner wall of the groove (1021) is arranged in an arc shape, and the inner wall of the groove (1021) is connected to the net cylinder (203).

6. A wastewater purification device according to claim 1, characterized in that: The spiral scraper (205) is spirally wound around the inner wall of the net cylinder (203), and one side of the net cylinder (203) penetrates the side plate (103) and is connected to the sand discharge trough (3).

7. A wastewater purification device according to claim 5, characterized in that: A gap is provided between the net cylinder (203) and the inner wall of the groove (1021), and three fixing strips (204) are provided. The three fixing strips (204) are arranged in an annular manner and equidistantly on the outer wall of the net cylinder (203), and one side of the fixing strips (204) is in contact with the inner wall of the groove (1021).

8. The wastewater purification device according to claim 1, characterized in that: A rotation speed meter (105) is provided on one side of the net cylinder (203) via a central rotating shaft (201), and the water inlet (4) is connected to an electric control valve. A control system is formed between the rotation speed meter (105) and the electric control valve.

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