Pretreatment filtering device for filtering suspended matters in sewage

Abstract

The invention provides a pretreatment filtering device for filtering suspended matters in sewage, which is characterized by comprising a box body, a liquid inlet pipe, a discharge pipe, a mounting mechanism and a filter screen, the box body is provided with a first chamber and a second chamber, the first chamber and the second chamber are communicated through a discharge port, the liquid inlet pipe and the discharge pipe are both fixedly connected to the box body, the liquid inlet pipe is communicated with the first chamber, the discharge pipe is communicated with the second chamber, and the filter screen is arranged in the first chamber through a mounting mechanism. Therefore, suspended matters in the to-be-treated sewage flowing through the first chamber are filtered out. Therefore, suspended matters suspended on the water surface in the to-be-treated sewage can be filtered out through the filter screen arranged in the first chamber, so that the aim of pre-filtering for subsequent sewage treatment equipment is fulfilled.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment equipment, and particularly relates to a pretreatment filtration device for filtering suspended solids in sewage. Background Art

[0002] With the acceleration of the urbanization process, the demand for small-scale sewage treatment, such as domestic sewage, catering wastewater, and sewage from small commercial facilities, is increasing day by day. Different from large centralized sewage treatment plants, small sewage treatment systems are widely used in rural domestic sewage treatment, scenic area supporting facilities, homestays, temporary construction sites, canteen kitchens, park test stations, etc. due to their flexible layout, low investment cost, and strong adaptability.

[0003] In the related art, to prevent large-volume solid suspended solids (such as plastic bags, branches, cloth strips, etc.) in sewage from entering subsequent treatment equipment, causing equipment blockage, wear, or affecting the biochemical treatment effect, an electric trash rack or a manual trash rack is usually set at the front end of the sewage treatment equipment for solid-liquid separation, that is, larger-sized solid impurities are intercepted through the gaps between the bars, and are cleaned manually or automatically regularly; However, existing grille equipment usually aims at "removing large solid wastes" (such as plastic bags, textiles, etc.), and has limited interception effect on small-sized and light-density suspended solids (such as hair, vegetable residues, paper scraps, floating particles, etc.), which are likely to enter subsequent sewage treatment equipment with the water flow, causing blockage of biochemical tanks, membrane modules, pipelines and an increase in sludge load, and affecting the treatment effect and equipment life. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a pretreatment filtration device for filtering suspended solids in sewage, which is used to filter impurities such as fine suspended solids in small-scale sewage, so as to at least partially solve the problems in the related art.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows: A pretreatment filtration device for filtering suspended solids in sewage, comprising: a box body, a liquid inlet pipe, a discharge pipe, an installation mechanism, and a filter screen; The box body has a first chamber and a second chamber, which are communicated through a discharge port. The liquid inlet pipe and the discharge pipe are both fixedly connected to the box body. The liquid inlet pipe is communicated with the first chamber, and the discharge pipe is communicated with the second chamber; The middle parts of the two inner wall surfaces of the first chamber that are arranged opposite to each other along the width direction of the first chamber are fixedly connected with mounting plates, and mounting columns are fixedly connected with mounting plates. The mounting mechanism includes a first mounting part and a fixing assembly. There are two first mounting parts, and the two first mounting parts are arranged opposite to each other along the width direction of the first chamber. The first mounting part includes a first plug-in column and a first plug-in board. The first plug-in column is provided with a first plug-in hole for the mounting column to be plugged in. The first plug-in column is rotatably connected to the first plug-in board through a deep groove ball bearing. The fixing assembly is arranged between the two first mounting parts and is provided with a fixing slot for the first plug-in board to be plugged in. The fixing assembly is also provided with a mounting hole group for connecting the inlet end of the filter screen, so that the filter screen can filter out suspended matter in the sewage to be treated flowing through the first chamber.

[0006] Furthermore, the mounting mechanism also includes a fastening assembly, which includes a fastening spring, a fastening nut and a fastening pad; The fastening spring and the fastening pad are both sleeved on the mounting column. A limiting ring is provided at one end of the first plug-in column for the fastening spring to abut against. The end of the fastening spring facing away from the limiting ring abuts against the fastening pad. The end of the mounting column facing away from the mounting plate is threadedly connected to the fastening nut. The fastening pad is arranged between the fastening nut and the fastening spring.

[0007] Furthermore, a stabilizing plate is provided at one end of the first plug-in column away from the limiting ring platform, and an embedding hole corresponding to the stabilizing plate is provided on the mounting plate.

[0008] Furthermore, a stabilizing column is provided on the installation column, and a first embedding channel corresponding to the stabilizing column is provided on the first plug-in column.

[0009] Furthermore, a second embedding channel corresponding to the stabilizing column is provided on the stabilizing plate, and an inlet end of the second embedding channel is configured as a trumpet-shaped opening.

[0010] Further, the fixing assembly includes a second mounting member, a third mounting member and a fourth mounting member; The second mounting member includes a second plug-in block, a second connecting rib plate and a second reinforcing plate, the second plug-in block is provided with a fixed slot, the number of the second plug-in blocks is two, the second connecting rib plate and the second reinforcing plate are vertically fixedly connected and arranged between the two second plug-in blocks, the second reinforcing plate is provided with a second connecting ear hole for connecting the filter screen, the third reinforcing plate is provided with a third connecting ear hole for connecting the filter screen, the fourth reinforcing plate is provided with a fourth connecting ear hole for connecting the filter screen, and the number of the second connecting ear hole, the third connecting ear hole and the fourth connecting ear hole are all multiple, so as to form a mounting hole group; The second plug-in block is provided with a second mounting position for connecting the third mounting member, and the end of the third mounting member away from the second plug-in block is provided with a third mounting position for connecting the fourth mounting member.

[0011] Further, the third mounting member includes a column and a third reinforcing plate; The column is configured as a column with a hollow space, the number of the third reinforcement plates is multiple, the multiple third reinforcement plates are arranged in the hollow space at intervals, and the third reinforcement plates are provided with third connecting ear holes, the second installation position is configured as a limiting hole, and a limiting column corresponding to the limiting hole is provided at one end of the column, and the number of the limiting holes and the limiting columns are both multiple and equal; When the limiting column is inserted into the limiting hole, the first through hole arranged on the column, the second through hole arranged on the second plug-in block and the third through hole arranged on the first plug-in board are coaxially arranged.

[0012] Further, the fourth mounting member includes a cover plate and a fourth reinforcing plate that are vertically fixedly connected, the third mounting position is configured as a fourth slot for a portion of the fourth reinforcing plate to be inserted into, a first threaded hole is provided at one end of the column away from the limiting column, and when a portion of the fourth reinforcing plate is inserted into the fourth slot, a fourth through hole provided on the cover plate is coaxially arranged with the first threaded hole; The fourth reinforcing plate is provided with a fourth connecting ear hole.

[0013] Further, it also includes a guiding mechanism; The guide mechanism is installed on the second connecting rib plate, and the guide mechanism includes a hanging member, an angle adjustment assembly and a guide plate. The hanging member is provided with hanging ears at both ends thereof which are arranged opposite to each other along its length. A receiving block is provided on an end surface of the second connecting rib plate which is away from the second reinforcing plate, and a receiving groove for receiving the hanging ear is provided on the receiving block. A hanging groove corresponding to the second connecting rib plate is provided on the hanging member, and a threaded column is provided on the receiving block. A second threaded hole which is connected to the receiving groove is provided in the threaded column. A fastening screw extends into the receiving groove through the second threaded hole, and an abutting groove corresponding to the fastening screw is provided on the hanging ear. The angle adjustment component includes a rotating rod, a first base, a second base, a third base and a return spring. The first base, the second base and the third base are all provided with a hole for the rotating rod to pass through, and a bushing is installed in the hole. The rotating rod is fixedly connected with a first bite block, and the second base is fixedly connected with a second bite block corresponding to the first bite block. The first bite block is provided with a first bite tooth, and the second bite block is provided with a second bite tooth adapted to the first bite tooth. The second bite block is provided with a through hole for the rotating rod to pass through. The return spring is sleeved on the rotating rod, and one end of the return spring abuts against the first base, and the other end abuts against the first bite block. The rotating rod is fixedly connected with the guide plate. A pull ring is arranged at one end of the rotating rod away from the third base.

[0014] Furthermore, the first chamber has hanging plates installed on two inner wall surfaces that are arranged opposite to each other along its width direction, and the lower surface of the hanging plate is provided with hanging ears for connecting the mesh body of the filter.

[0015] Through the above technical solution, the liquid inlet pipe introduces sewage into the first chamber located in the upper layer. After being treated by the filter screen, it flows into the second chamber in the lower layer through the discharge port and is discharged through the discharge pipe, forming a certain height difference, effectively enhancing the fluidity of the sewage and improving the filtering efficiency of the filter screen. At the same time, in order to improve the installation efficiency of the filter screen, the fixing component and the first mounting member can be connected in advance through the fixing slot, and then the filter screen is installed on the fixing component through the mounting hole group. Since the mounting plate is arranged in the middle of the inner wall of the first chamber, when the mounting column is inserted into the first insertion hole, the bottom of the filter screen is exactly in the middle position of the first chamber, so that the water layer with a large amount of suspended matter in the sewage is accurately intercepted by the filter screen. While improving the filtering accuracy, it can also minimize the impact of the filter screen on the sewage flow velocity, thereby achieving an efficient and stable sewage suspended matter filtering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which form a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 FIG. is a schematic structural diagram of the interior of the box provided in the exemplary embodiment of the present disclosure, in which some metal plates constituting the box are not shown; Figure 2 FIG. is a schematic structural diagram of the installation mechanism provided in the exemplary embodiment of the present disclosure; Figure 3 FIG. is a schematic structural diagram of the guiding mechanism provided in the exemplary embodiment of the present disclosure; Figure 4 FIG. is a schematic structural diagram of the angle adjustment component provided in the exemplary embodiment of the present disclosure; Figure 5 FIG. is a schematic structural diagram of the installation mechanism from another angle provided in the exemplary embodiment of the present disclosure; Figure 6 FIG. is a schematic structural diagram of the first mounting member and the second mounting member provided in the exemplary embodiment of the present disclosure; Figure 7 FIG. is a schematic structural diagram of the mounting plate and the mounting column provided in the exemplary embodiment of the present disclosure; Figure 8 FIG. is a schematic structural diagram of the second mounting member provided in the exemplary embodiment of the present disclosure; Figure 9 FIG. is a schematic structural diagram of the fastening component provided in the exemplary embodiment of the present disclosure; Figure 10 FIG. is a schematic structural diagram of the first mounting member and the fastening spring provided in the exemplary embodiment of the present disclosure; Figure 11It is a schematic cross-sectional structure diagram of a first mounting member and a fastening assembly provided in an exemplary embodiment of the present disclosure; Figure 12 It is a schematic structure diagram of a second mounting member provided in an exemplary embodiment of the present disclosure; Figure 13 It is a schematic structure diagram of a column at one angle provided in an exemplary embodiment of the present disclosure; Figure 14 It is a schematic structure diagram of the column at another angle provided in an exemplary embodiment of the present disclosure; Figure 15 It is a schematic structure diagram of a fourth mounting member provided in an exemplary embodiment of the present disclosure; Figure 16 It is a schematic structure diagram of a suspension plate and a suspension ear provided in an exemplary embodiment of the present disclosure; Figure 17 It is a schematic structure diagram of the interior of a first chamber and a second chamber provided in an exemplary embodiment of the present disclosure, wherein a guiding platform is provided in the first chamber; Figure 18 It is a schematic structure diagram of the exterior of a box body provided in an exemplary embodiment of the present disclosure; Figure 19 It is a schematic structure diagram of a filter screen provided in an exemplary embodiment of the present disclosure; Figure 20 It is a schematic cross-sectional structure diagram of a first mounting member and a fastening assembly provided in an exemplary embodiment of the present disclosure, wherein a support sleeve is mounted on the first insertion post.

[0017] Explanation of reference numerals: 1. Box body; 101. First chamber; 102. Second chamber; 103. Discharge port; 104. Liquid inlet pipe; 105. Discharge pipe; 106. Mounting plate; 1061. Embedding hole; 107. Mounting column; 1071. Stabilizing column; 108. Hanging plate; 109. Hanging ear; 2. Filter screen; 3. First mounting member; 301. First plugging column; 3011. Limiting ring platform; 3012. First embedding channel; 302. First plugging plate; 3021. Third through hole; 303. Deep groove ball bearing; 4. Stabilizing plate; 401. Second embedding channel; 5. Fastening assembly; 501. Fastening spring; 502. Fastening nut; 503. Fastening backing plate; 6. Second mounting member; 601. Second plugging block; 6011. Fixed slot; 6012. Limiting hole; 6013. Second through hole; 602. Second connecting rib plate; 603. Second reinforcing plate; 6031. Second connecting ear hole; 604. Receiving block; 6041. Receiving groove; 605. Threaded column; 6051. Second threaded hole; 7. Third mounting member; 701. Column; 7011. First through hole; 7012. Fourth slot; 7013. First threaded hole; 702. Third reinforcing plate; 7021. Third connecting ear hole; 703. Limiting column; 8. Fourth mounting member; 801. Cover plate; 8011. Fourth through hole; 802. Fourth reinforcing plate; 8021. Fourth connecting ear hole; 9. Guiding mechanism; 901. Hanging member; 9011. Hanging groove; 902. Angle adjusting assembly; 9021. First base; 9022. Second base; 9023. Third base; 9024. Return spring; 9025. First engaging block; 90251. First engaging tooth; 9026. Second engaging block; 90261. Second engaging tooth; 9027. Rotating rod; 903. Guide plate; 904. Hanging ear; 9041. Abutting groove; 905. Fastening screw; 906. Pulling ring; 10. Guide table; 11. Slope; 12. Support sleeve. Detailed implementation manners

[0018] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0019] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. These terms are only used for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0020] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0022] In the related art, in order to prevent large-volume solid suspended matters (such as plastic bags, tree branches, cloth strips, etc.) in sewage from entering subsequent treatment equipment, causing equipment blockage, wear, or affecting the biochemical treatment effect, an electric bar screen or a manual bar screen is usually set at the front end of the sewage treatment equipment for solid-liquid separation. That is, larger-sized solid impurities are intercepted through the bar gaps, and are cleaned manually or automatically at regular intervals. However, the existing electric bar screen equipment generally has the following problems: (1) Electric bar screens are generally designed for large-flow sewage treatment processes, with a large structure and high installation space requirements, and are not suitable for decentralized sewage treatment projects with limited space and small treatment water volumes.

[0023] (2) Electric bar screens involve mechanical components such as motors, chains, and slag scraping mechanisms, with high procurement costs, and also high energy consumption and maintenance costs during operation, and are not suitable for small sewage treatment stations or user groups with limited economic affordability.

[0024] (3) The grid equipment usually aims at "removing large solid wastes" (such as plastic bags, textiles, etc.). For suspended solids with small volume and low density (such as hair, vegetable residues, paper scraps, floating particles, etc.), the interception effect is limited, and they are likely to enter the subsequent sewage treatment equipment with the water flow, causing blockage of the biochemical pool, membrane module, pipeline and an increase in sludge load, affecting the sewage treatment effect and the service life of the sewage treatment equipment.

[0025] Specifically, a pretreatment filtration device for filtering suspended solids in sewage provided by the present disclosure is mainly applied to the front-end pretreatment link of small and decentralized sewage treatment systems, and is particularly suitable for the following typical application scenarios: I. Pretreatment of domestic sewage in rural families and rural sewage centralized treatment points; II. Sewage treatment sites containing kitchen wastewater, such as small catering units and canteen kitchens; III. Treatment of washing domestic sewage in public service facilities such as homestays, hotels, and bath centers; IV. Domestic sewage drainage systems in temporary construction site dormitories and office areas; V. Local treatment systems for non-continuous drainage points such as universities, scientific research test stations, and horticultural bases; VI. Other sewage treatment sites with limited space and small treatment water volume.

[0026] In the scenarios mentioned above, the sewage often contains suspended solids with small particle size, low density, strong floating property or difficult to settle naturally, that is, vegetable residue debris, rice grains, seasoning residues, paper towel fragments common in kitchen wastewater; hair, fiber flocs, laundry foam packages in domestic sewage; dandruff, hair strands, soap liquid mixed particles in bathroom drainage; sediment, plant fragments, soil suspended solids in agricultural or horticultural sewage; plastic sheets, paper scraps, dust deposition particles in temporary facility drainage, etc. Although these suspended solids do not belong to "large solid impurities", they will have a significant adverse impact on the subsequent biochemical treatment units (such as contact oxidation tanks, MBR membrane modules, activated sludge tanks, etc.), manifested as problems such as membrane blockage, increased tank body load, deteriorated effluent quality and increased operation and maintenance frequency.

[0027] Based on this, in the specific embodiments provided by the present disclosure, a pretreatment filtration device for filtering suspended solids in sewage is provided, referring to Figures 1 to 20As shown in the figure, the pretreatment filtering device includes: a box body 1, a liquid inlet pipe 104, a discharge pipe 105, a mounting mechanism, and a filter screen 2. Among them, the box body 1 has a first chamber 101 and a second chamber 102, and the first chamber 101 and the second chamber 102 are communicated through a discharge port 103. The liquid inlet pipe 104 and the discharge pipe 105 are both fixedly connected to the box body 1. The liquid inlet pipe 104 is communicated with the first chamber 101, and the discharge pipe 105 is communicated with the second chamber 102. At the middle parts of the two inner wall surfaces of the first chamber 101 arranged oppositely along its width direction, mounting plates 106 are fixedly connected, and mounting columns 107 are fixedly connected to the mounting plates 106. The mounting mechanism includes a first mounting member 3 and a fixing component. The number of the first mounting members 3 is two, and the two first mounting members 3 are arranged oppositely along the width direction of the first chamber 101. The first mounting member 3 includes a first insertion column 301 and a first insertion plate 302. A first insertion hole for inserting the mounting column 107 is provided on the first insertion column 301. The first insertion column 301 is rotatably connected to the first insertion plate 302 through a deep groove ball bearing 303. The fixing component is arranged between the two first mounting members 3, and a fixing slot 6011 for inserting the first insertion plate 302 is provided on the fixing component. An installation hole group for connecting the inlet end of the filter screen 2 is also provided on the fixing component, so that the filter screen 2 can filter out the suspended substances in the sewage to be treated flowing through the first chamber 101.

[0028] Through the above technical solution, the liquid inlet pipe 104 introduces the sewage into the upper first chamber 101. After being treated by the filter screen 2, it flows into the lower second chamber 102 through the discharge port 103 and is discharged through the discharge pipe 105, forming a certain height difference, effectively enhancing the fluidity of the sewage and improving the filtering efficiency of the filter screen 2. At the same time, in order to improve the installation efficiency of the filter screen 2, the fixing component and the first mounting member 3 can be connected in advance through the fixing slot 6011, and then the filter screen 2 is installed on the fixing component through the installation hole group. Since the mounting plate 106 is arranged at the middle part of the inner wall of the first chamber 101, when the mounting column 107 is inserted into the first insertion hole, the bottom of the filter screen 2 is exactly at the middle position of the first chamber 101, so that the water layer containing a large amount of suspended substances in the sewage is accurately intercepted by the filter screen 2. While improving the filtering accuracy, it can also minimize the influence of the filter screen 2 on the sewage flow velocity, thereby achieving an efficient and stable sewage suspended substance filtering effect.

[0029] Exemplarily, referring to Figure 19 As shown in the figure, the filter screen 2 is configured as a filter screen 2 in the shape of a net pocket. Among them, the structure of the filter screen 2 in the shape of a net pocket is flexible and can adapt to suspended substances of different shapes and sizes, effectively improving the interception efficiency of particulate matters in the sewage. Compared with the traditional flat filter screen 2, the net pocket structure has a larger surface area, can provide more filtering space, thereby increasing the processing capacity of the filter screen 2, extending the filtering cycle, and reducing the replacement frequency.

[0030] In some embodiments, referring to Figure 11 and Figure 20 As shown, the first plug post 301 is rotatably connected to the first plug board 302 through a deep groove ball bearing 303. When the filter screen 2 is arranged in the first chamber 101 for filtering operation, with the water pressure and impurity resistance generated during the flow of sewage, the deep groove ball bearing 303 needs to bear a certain axial force and radial force. To improve the connection stability between the first plug post 301 and the first plug board 302, a support sleeve 12 is installed on the first plug post 301. The support sleeve 12 includes a connected connection section and an abutting section. Wherein, the connection section is fixedly connected to the outer surface of the first plug post 301 and forms a firm connection with the first plug post 301 by means of interference fit or screw fastening, etc. The abutting section is located at one end of the connection section and extends towards the direction of the first plug board 302. The abutting section can effectively support and limit the axial displacement of the first plug board 302, playing a role of stable support.

[0031] In some embodiments, referring to Figure 17 and Figure 18 As shown, a guiding platform 10 is further arranged in the first chamber 101. The number of guiding platforms 10 is two. The two guiding platforms 10 are arranged oppositely along the width direction of the first chamber 101. A diversion channel is formed between the two oppositely arranged guiding platforms 10. Specifically, the width of the guiding channel gradually decreases along the flow direction of the sewage flowing through the first chamber 101, forming a diversion effect from wide to narrow. The sewage is guided through the diversion channel to accurately flow to the opening part of the filter screen 2, effectively avoiding the deviation of the sewage flow from the filtering area, so as to ensure that more suspended matters can be accurately intercepted by the filter screen 2 and improve the working efficiency of the filter screen 2.

[0032] In some embodiments, referring to Figure 1 and Figure 17 As shown, a slope 11 is arranged in the second chamber 102. Wherein, the height of the slope 11 gradually decreases along the flow direction of the sewage flowing through the second chamber 102, and the slope 11 has a downward inclined structure. This downward inclined structure can optimize the flow state of the sewage in the second chamber 102, further improve the discharge efficiency and avoid sewage retention. That is, after the sewage is filtered by the first chamber 101, it enters the second chamber 102 through the discharge port 103. Under the guiding action of the slope 11, the sewage can flow towards the discharge pipe 105 in a relatively stable posture, thereby reducing the backflow, turbulence or sedimentation phenomena generated by the water flow in the chamber. Since the height of the slope 11 gradually decreases, its downward inclination angle is consistent with the direction of the water flow gravity, which helps to enhance the water flow kinetic energy and improve the drainage efficiency.

[0033] In some embodiments, referring to Figure 1 and Figure 17As shown, in order to avoid the problems of decreased sewage flow rate and clogging of the filter 2 due to overall interception filtration, in the pretreatment filtration device provided by the present invention, the filter 2 is arranged in a local area. Specifically, the filter 2 is arranged in the middle area of the first chamber 101 and only covers a part of the flow path in the first chamber 101. Therefore, when the sewage flows through the first chamber 101, it can not only accurately filter the suspended matter in the sewage, but also realize rapid circulation of the sewage through the area not covered by the filter 2. While maintaining sufficient water flow, the clogging frequency of the filter 2 is also reduced.

[0034] At the same time, reference Figure 19 As shown, the filter 2 is preferably a net bag-like structure, and a storage tail bag is provided at the tail of the filter 2 to collect and store the intercepted suspended matter. The tail of the storage tail bag can be configured as an openable structure, that is, when the filter 2 needs to be replaced and cleaned, the replaced filter 2 can open its tail to clean the suspended matter and other impurities accumulated inside it.

[0035] In some embodiments, reference Figure 2 , Figures 5 to 11 As shown, the installation mechanism also includes a fastening component 5, which includes a fastening spring 501, a fastening nut 502 and a fastening pad 503, wherein the fastening spring 501, the fastening nut 502 and the fastening pad 503 cooperate with each other to elastically press and stabilize the position of the assembly state of the first plug-in column 301, and the fastening spring 501 and the fastening pad 503 are both sleeved on the installation column 107, and one end of the first plug-in column 301 is provided with a limiting ring 3011 for the fastening spring 501 to abut against, and the limiting ring 3011 is used as a fixed end of the fastening spring 501, and the fastening spring 501 is fixed to the first plug-in column 301. One end of the mounting column 107 away from the limiting ring 3011 is in contact with the fastening pad 503, and one end of the mounting column 107 away from the mounting plate 106 is threadedly connected to the fastening nut 502. The fastening pad 503 is arranged between the fastening nut 502 and the fastening spring 501. The expansion and contraction amount of the fastening spring 501 can be adjusted by rotating the fastening nut 502. The setting of the fastening spring 501 makes the first plug-in column 301 and the mounting column 107 always maintain a certain elastic compression state, which can effectively absorb the slight deviation caused by factors such as vibration and water pressure fluctuation during the operation of the equipment, ensure that the first plug-in column 301 is not easy to loosen, and improve the operation stability.

[0036] In some embodiments, reference Figures 6 to 11As shown, in order to further improve the connection stability between the first plug-in column 301 and the mounting plate 106, a stabilizing plate 4 is provided at the end of the first plug-in column 301 away from the limiting ring 3011, and an embedding hole 1061 corresponding to the stabilizing plate 4 is provided on the mounting plate 106, wherein, when the first plug-in column 301 is plugged into the mounting column 107 and the assembly is completed, the stabilizing plate 4 can be accurately embedded in the embedding hole 1061 on the mounting plate 106, thereby forming a limiting fit to prevent the first plug-in column 301 from rotating or axially displacing during operation.

[0037] In some embodiments, reference Figures 6 to 11 As shown, in order to further enhance the connection stability and anti-deviability performance between the first plug-in column 301 and the mounting column 107, a stabilizing column 1071 is provided on the mounting column 107, and a first embedding channel 3012 corresponding thereto is provided on the first plug-in column 301, wherein the stabilizing column 1071 is in the form of a plug-in column structure and is protruded along the axial direction of the mounting column 107, and the first embedding channel 3012 is opened at the plug-in end of the first plug-in column 301 to accommodate and engage the stabilizing column 1071. Specifically, when the first plug-in column 301 is plugged into the mounting column 107, the stabilizing column 1071 will be synchronously embedded in the first embedding channel 3012 to form a slot-type limiting fit. This fitting structure not only enhances the anti-axial and radial shaking capabilities of the connection, but also provides direction limitation and anti-rotation functions to a certain extent, thereby ensuring the stability of the installation position of the filter 2 and the consistency of the filtering direction.

[0038] At the same time, the stabilizing column 1071 has a certain positioning function, that is, with the coordinated cooperation between the first embedded channel 3012 and the stabilizing column 1071, when the first plug-in column 301 and the installation column 107 are assembled, the stabilizing column 1071 can be naturally introduced into the first embedded channel 3012, thereby reducing manual positioning errors and improving overall assembly efficiency and consistency.

[0039] In addition, the stabilizing column 1071 can also enhance the connection strength between the mounting column 107 and the mounting plate 106, so that the mounting column 107 has multiple connection locations on the mounting plate 106, which significantly enhances the installation stability and force bearing capacity of the mounting column 107, thereby optimizing the impact resistance, fatigue resistance and long-term use stability of the overall structure of the filtering device.

[0040] In some embodiments, reference Figure 9 and Figure 10As shown, the stabilizing plate 4 is provided with a second embedding channel 401 corresponding to the stabilizing column 1071. Specifically, when the first plugging column 301 is installed on the mounting column 107, the first plugging column 301 has a first plugging state and a second plugging state. Among them, when the first plugging column 301 is in the first plugging state, the stabilizing column 1071 is fitted into the first embedding channel 3012. When the first plugging column 301 is in the second plugging state, the stabilizing column 1071 is fitted into the second embedding channel 401. By switching between the first plugging state and the second plugging state, the height position of the first plugging column 301 can be adjusted. That is, the distance between the first plugging plate 302 and the mounting plate 106 when in the first plugging state is less than the distance between the first plugging plate 302 and the mounting plate 106 when in the second plugging state. When the height position of the first plugging plate 302 changes, the height position of the filter screen 2 connected to the fixing component will change synchronously with the change in the height position of the first plugging plate 302.

[0041] Exemplarily, by switching between the first plugging state and the second plugging state, the height of the filter screen 2 can be adjusted. The purpose of setting the height of the filter screen 2 to be adjustable is that the filter screen 2 is used to filter the suspended matter in the sewage flowing through the first chamber 101. Therefore, part of the filter screen 2 is exposed above the sewage water surface, and in order not to affect the flow rate of the sewage, the lower end of the filter screen 2 does not contact the bottom of the first chamber 101. Based on this, according to the liquid level height of the first chamber 101 or the types of impurities such as suspended matter in the sewage, the installation height of the filter screen 2 can be flexibly adjusted by switching the plugging state, improving the compatibility and versatility of the filter screen 2, so that the filter screen 2 can adapt to different sewage volumes or different types of suspended matter and other impurities.

[0042] Specifically, since the suspended matter is relatively light in weight, it is usually suspended and distributed in the upper and middle layers of the sewage. Among them, by switching between the first plugging state and the second plugging state, the filter screen 2 can filter the suspended matter more accurately. That is, when there is more suspended matter, the first plugging column 301 is in the first plugging state; when there is less suspended matter, the first plugging column 301 is in the second plugging state.

[0043] In some embodiments, referring to Figure 10 As shown, the inlet end of the second embedding channel 401 is configured as a flared open mouth. That is, through the flared open mouth, it can be ensured that the stabilizing column 1071 is smoothly inserted into the second embedding channel 401, effectively improving the plugging efficiency during state switching and avoiding misalignment caused by operation errors.

[0044] In some embodiments, the fixing assembly includes a second mounting member 6, a third mounting member 7 and a fourth mounting member 8, the second mounting member 6 includes a second plug-in block 601, a second connecting rib plate 602 and a second reinforcing plate 603, the second plug-in block 601 is provided with a fixing slot 6011, the number of the second plug-in blocks 601 is two, the vertically connected second connecting rib plate 602 and the second reinforcing plate 603 are arranged between the two second plug-in blocks 601, wherein, with reference to Figure 12 As shown, the second reinforcing plate 603 is used to enhance the connection strength between the second connecting rib plate 602 and the two ground plug-in blocks, and improve the impact resistance and vibration resistance; at the same time, refer to Figures 12 to 15 As shown, the second reinforcing plate 603 is provided with a second connecting ear hole 6031 for connecting to the filter 2, the third reinforcing plate 702 is provided with a third connecting ear hole 7021 for connecting to the filter 2, and the fourth reinforcing plate 802 is provided with a fourth connecting ear hole 8021 for connecting to the filter 2. The number of the second connecting ear hole 6031, the third connecting ear hole 7021 and the fourth connecting ear hole 8021 are all multiple to form a mounting hole group, and can realize multi-point uniform force on the filter 2.

[0045] Exemplarily, the connection between the filter screen 2 and the second connection ear hole 6031 , the third connection ear hole 7021 and the fourth connection ear hole 8021 may be fixed by a hook or a cable tie.

[0046] In some embodiments, reference Figures 12 to 15 As shown, the second mounting member 6, the third mounting member 7 and the fourth mounting member 8 are independent and coordinated, that is, a second mounting position for connecting the third mounting member 7 is provided on the second plug-in block 601, and a third mounting position for connecting the fourth mounting member 8 is provided on the end of the third mounting member 7 facing away from the second plug-in block 601, so as to facilitate disassembly and regular replacement and maintenance.

[0047] In some embodiments, reference Figure 13 and Figure 14As shown, the third mounting member 7 includes a column 701 and a plurality of third reinforcing plates 702. The column 701 is configured as a column with a middle space. The number of the third reinforcing plates 702 is multiple, and the multiple third reinforcing plates 702 are arranged at intervals within the middle space, and third connecting ear holes 7021 are provided on the third reinforcing plates 702 for connecting the filter screen 2. The second mounting position is configured as a limiting hole 6012, and a limiting post 703 corresponding to the limiting hole 6012 is provided at one end of the column 701. Since the number of the limiting holes 6012 and the limiting posts 703 is both multiple and equal, when the column 701 is fixed to the second plugging block 601, the limiting posts 703 inserted into the limiting holes 6012 can effectively limit the column 701, that is, through the multi-point cooperation of the limiting posts 703 and the limiting holes 6012, a firm limiting connection is formed between the column 701 and the second plugging block 601. When the column 701 is subjected to an external force, the limiting posts 703 can effectively prevent rotation and offset.

[0048] For the installation instructions of the third mounting member 7, refer to Figure 5 and Figure 6 As shown, when the limiting post 703 is inserted into the limiting hole 6012, a first through hole 7011 provided on the column 701, a second through hole 6013 provided on the second plugging block 601, and a third through hole 3021 provided on the first plugging plate 302 are coaxially arranged. At this time, the second mounting member 6 and the third mounting member 7 can be fixed by bolts. The coaxial arrangement of the first through hole 7011, the second through hole 6013, and the third through hole 3021 can reduce the assembly difficulty and assembly error.

[0049] Exemplarily, the column 701 is configured as a column with a middle space, having the following advantages: 1. Compared with a solid structure, the overall weight of the column 701 is reduced, which is helpful for installation.

[0050] 2. The third reinforcing plates 702 with reasonable layout play the role of reinforcing ribs in the middle space, enhancing the bending resistance and compressive resistance.

[0051] Meanwhile, refer to Figure 5 As shown, the middle space of the column 701 can limit the bolts, that is, when the second mounting member 6 and the third mounting member 7 are fixed by bolts, the middle space of the column 701 can prevent the bolts from rotating by themselves, thus simplifying the installation steps of personnel.

[0052] In some embodiments, refer to Figure 13 and Figure 15As shown, the fourth mounting member 8 includes a cover plate 801 and a fourth reinforcing plate 802 that are vertically fixed, wherein the fourth reinforcing plate 802 is provided with a fourth connecting ear hole 8021, the third mounting position is configured as a fourth slot 7012 for partially inserting the fourth reinforcing plate 802, and the end of the column 701 away from the limiting column 703 is provided with a first threaded hole 7013, and when the fourth reinforcing plate 802 is partially inserted into the fourth slot 7012, the fourth through hole 8011 provided on the cover plate 801 is simultaneously with the first threaded hole 7013 Axis setting, specifically, when part of the fourth reinforcement plate 802 is inserted into the fourth slot 7012, a stable mechanical engagement with the third mounting member 7 is formed. At the same time, the fourth through hole 8011 provided on the cover plate 801 is coaxially arranged with the first threaded hole 7013. At this time, the third mounting member 7 and the fourth mounting member 8 are fixed by screws. The coaxial setting of the fourth through hole 8011 and the first threaded hole 7013 can ensure a high degree of alignment when the screw is installed, and ensure that the screw can be accurately connected to the first threaded hole 7013.

[0053] In some embodiments, reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6As shown, it further includes a guiding mechanism 9, which is installed on the second connecting rib plate 602. The guiding mechanism 9 includes a hanging member 901, an angle adjusting component 902 and a guiding plate 903. Among them, both ends of the hanging member 901 arranged relatively along its own length are provided with hanging ears 904. One end face of the second connecting rib plate 602 facing away from the second reinforcing plate 603 is provided with a receiving block 604, and the receiving block 604 is provided with a receiving groove 6041 for receiving the hanging ears 904. The hanging member 901 is provided with a hanging groove 9011 corresponding to the second connecting rib plate 602. The receiving block 604 is further provided with a threaded post 605, and the threaded post 605 is provided with a second threaded hole 6051 communicating with the receiving groove 6041. A fastening screw 905 extends into the receiving groove 6041 through the second threaded hole 6051, and the hanging ear 904 is provided with an abutting groove 9041 corresponding to the fastening screw 905. Specifically, when the guiding mechanism 9 needs to be installed, the hanging member 901 can be installed on the second connecting rib plate 602 in a hanging form, that is, the hanging member 901 is hung on the second connecting rib plate 602 through the hanging groove 9011. At this time, the hanging ear 904 fixedly connected to the hanging member 901 should be located in the receiving groove 6041. Then, the hanging ear 904 is abutted and fixed by the fastening screw 905. The fastening screw 905 extends into the receiving groove 6041 through the second threaded hole 6051 and abuts against the abutting groove 9041 of the hanging ear 904. The hanging member 901 is installed on the second connecting rib plate 602 in a form of side pressing by the fastening screw 905, which can improve the overall assembly efficiency of the guiding mechanism 9. Moreover, the guiding mechanism 9 is an independent component as a whole and can be disassembled separately without disassembling the second connecting rib plate 602, significantly improving the post-maintainability and replacement efficiency of the product and reducing the maintenance cost.

[0054] In some embodiments, the angle adjustment assembly 902 includes a rotating rod 9027, a first base 9021, a second base 9022, a third base 9023 and a return spring 9024, wherein the first base 9021, the second base 9022 and the third base 9023 are all provided with a channel for the rotating rod 9027 to pass through, and a bushing is installed in the channel, the bushing reduces the friction of the rotating rod 9027 and extends the service life, the rotating rod 9027 is fixedly connected with a first bite block 9025, the second base 9022 is fixedly connected with a second bite block 9026 corresponding to the first bite block 9025, the first bite block 9025 is provided with a first bite tooth 90251, the second bite block 9026 is provided with a second bite tooth 90261 adapted to the first bite tooth 90251, When the first engaging tooth 90251 engages with the second engaging tooth 90261, the rotating rod 9027 is in a locked state and cannot rotate. When the first engaging tooth 90251 is disengaged from the second engaging tooth 90261, the rotating rod 9027 is in a rotating state. When the rotating rod 9027 rotates, the guide plate 903 fixed to the rotating rod 9027 will rotate synchronously, thereby realizing the angle adjustment of the guide plate 903. At the same time, the reset spring 9024 is sleeved on the rotating rod 9027 and one end of the reset spring 9024 abuts against the first base 9021, and the other end abuts against the first engaging block 9025. The elastic force of the reset spring 9024 can act on the first engaging block 9025. Under the action of the elastic force of the reset spring 9024, the first engaging tooth 90251 can stably engage with the second engaging tooth 90261.

[0055] In some embodiments, reference Figure 4 As shown, the second base 9022 is fixedly connected with a second bite block 9026 corresponding to the first bite block 9025, and the second bite block 9026 is provided with a through hole for the rotation rod 9027 to pass through. The first bite block 9025 and the second bite block 9026 cooperate with the first bite tooth 90251 and the second bite tooth 90261 to ensure accurate positioning during angle adjustment. When the angle needs to be adjusted, the rotation rod 9027 is arranged away from the third base 9023. The pull ring 906 at one end pulls the rotating rod 9027, so that the first engaging tooth 90251 and the second engaging tooth 90261 are disengaged. After disengagement, the rotating rod 9027 is rotated to make the first engaging block 9025 fixed on the rotating rod 9027 rotate synchronously until the angle of the guide plate 903 is adjusted to a suitable position, and then the pull ring 906 is released. At this time, under the elastic force of the reset spring 9024, the first engaging tooth 90251 and the second engaging tooth 90261 are engaged with each other again.

[0056] Description of the guiding mechanism 9: Along the flow direction of the sewage in the first chamber 101, the guiding plate 903 is arranged upstream of the filter screen 2. The guiding plate 903 can guide the sewage flowing towards the filter screen 2. The angle of the guiding plate 903 can be adjusted through the angle adjustment component 902, so as to optimize the path and angle of the sewage carrying suspended substances flowing through the filter screen 2, enabling the fluid to pass through the filter screen 2 more fully and evenly, thereby improving the filtration efficiency and the utilization rate of the filter screen 2.

[0057] In some embodiments, referring to Figure 1 、 Figure 16 and Figure 17 as shown, suspension plates 108 are installed on both inner wall surfaces of the first chamber 101 arranged oppositely along its own width direction. Suspension ears 109 for connecting the mesh body of the filter screen 2 are provided on the lower surface of the suspension plates 108. Reinforcing ribs are provided on the upper surface of the suspension plates 108 to enhance the connection strength between the suspension plates 108 and the inner wall surface of the first chamber 101. Among them, the mesh body of the filter screen 2 is stably suspended inside the first chamber 101 through the suspension ears 109, ensuring that the filter screen 2 has sufficient tension and is not slack, and can effectively prevent the filter screen 2 from sagging due to gravity or water flow disturbance.

[0058] Exemplarily, a liquid level gauge can also be arranged in the first chamber 101. Among them, the liquid level gauge is communicatively connected to the controller, and the controller is then connected to a water pump for draining or transporting water for control, thereby forming a water level dynamic adjustment system, that is, a closed-loop system composed of a liquid level gauge + a controller + a water pump can realize real-time monitoring and automatic adjustment of the water level, without the need for frequent manual inspections and operations. At the same time, at least two liquid level gauges can be arranged. One is used to detect the upper water level limit to prevent sewage from overflowing out of the first chamber 101, and the other is used to detect the lower water level limit to prevent dry filtration of the filter screen 2 caused by too low water level.

[0059] Those of ordinary skill in the art should understand that: The discussion of any above embodiment is only exemplary and is not intended to imply that the scope of the present disclosure is limited to these examples; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

Claims

1. A pretreatment filtration device for filtering suspended solids in sewage, characterized in that, include: A box body (1), a liquid inlet pipe (104), a discharge pipe (105), a mounting mechanism, and a filter screen (2); The housing (1) comprises a first chamber (101) and a second chamber (102); the first chamber (101) and the second chamber (102) are connected via a discharge port (103); a liquid inlet pipe (104) and a discharge pipe (105) are both fixedly connected to the housing (1); the liquid inlet pipe (104) is connected to the first chamber (101), and the discharge pipe (105) is connected to the second chamber (102); The middle parts of the two inner wall surfaces of the first chamber (101) which are arranged opposite to each other along the width direction of the first chamber (101) are both fixedly connected to a mounting plate (106), and a mounting column (107) is fixedly connected to the mounting plate (106). The mounting mechanism comprises a first mounting member (3) and a fixing assembly. The number of the first mounting members (3) is two, and the two first mounting members (3) are arranged opposite to each other along the width direction of the first chamber (101). The first mounting member (3) comprises a first plug-in column (301) and a first plug-in plate (302). The first plug-in column (301) is provided with a first plug-in column (301). A first plugging hole for plugging a mounting column (107), the first plugging column (301) being rotatably connected to a first plugging plate (302) via a deep groove ball bearing (303), a fixing assembly being arranged between two first mounting members (3) and provided with a fixing slot (6011) for plugging the first plugging plate (302), and a mounting hole group for connecting to the inlet end of a filter screen (2) being provided on the fixing assembly, so that the filter screen (2) can filter out suspended matter in the sewage to be treated flowing through the first chamber (101).

2. The pretreatment filtration device for filtering sewage suspended solids according to claim 1, wherein: The mounting mechanism further comprises a fastening assembly (5), wherein the fastening assembly (5) comprises a fastening spring (501), a fastening nut (502) and a fastening pad (503); The fastening spring (501) and the fastening pad (503) are both sleeved on the mounting column (107); one end of the first plug-in column (301) is provided with a limiting ring platform (3011) for the fastening spring (501) to abut against; one end of the fastening spring (501) that is away from the limiting ring platform (3011) abuts against the fastening pad (503); one end of the mounting column (107) that is away from the mounting plate (106) is threadedly connected to the fastening nut (502); and the fastening pad (503) is arranged between the fastening nut (502) and the fastening spring (501).

3. The pretreatment filtration device for filtering sewage suspended solids according to claim 2, wherein: A stabilizing plate (4) is provided at one end of the first plug-in column (301) that is away from the limiting ring platform (3011), and an embedding hole (1061) corresponding to the stabilizing plate (4) is provided on the mounting plate (106).

4. The pretreatment filtration device for filtering sewage suspended solids according to claim 3, wherein: A stabilizing column (1071) is provided on the installation column (107), and a first embedding channel (3012) corresponding to the stabilizing column (1071) is provided on the first plug-in column (301).

5. The pretreatment filtration device for filtering sewage suspended solids according to claim 4, wherein: A second embedded channel (401) corresponding to the stabilizing column (1071) is provided on the stabilizing plate (4), and the inlet end of the second embedded channel (401) is configured as a trumpet-shaped opening.

6. The pretreatment filtration device for filtering sewage suspended solids according to claim 1, wherein: The fixing assembly comprises a second mounting member (6), a third mounting member (7) and a fourth mounting member (8); The second mounting member (6) comprises a second plug-in block (601), a second connecting rib plate (602) and a second reinforcing plate (603); the second plug-in block (601) is provided with a fixed slot (6011); the number of the second plug-in blocks (601) is two; the second connecting rib plate (602) and the second reinforcing plate (603) are vertically fixedly arranged between the two second plug-in blocks (601); the second reinforcing plate (603) is provided with a second connecting ear hole (6031) for connecting to the filter screen (2); the third reinforcing plate (702) is provided with a third connecting ear hole (7021) for connecting to the filter screen (2); the fourth reinforcing plate (802) is provided with a fourth connecting ear hole (8021) for connecting to the filter screen (2); the number of the second connecting ear hole (6031), the third connecting ear hole (7021) and the fourth connecting ear hole (8021) is multiple, so as to form a mounting hole group; The second plug-in block (601) is provided with a second mounting position for connecting to a third mounting member (7), and an end of the third mounting member (7) facing away from the second plug-in block (601) is provided with a third mounting position for connecting to a fourth mounting member (8).

7. The pretreatment filtration device for filtering sewage suspended solids according to claim 6, characterized in that: The third mounting member (7) comprises a column (701) and a third reinforcing plate (702); The column (701) is configured as a column with a hollow partition, the number of the third reinforcing plates (702) is multiple, the multiple third reinforcing plates (702) are arranged in the hollow partition at intervals, and the third reinforcing plates (702) are provided with third connecting ear holes (7021), the second installation position is configured as a limiting hole (6012), one end of the column (701) is provided with a limiting column (703) corresponding to the limiting hole (6012), and the number of the limiting holes (6012) and the limiting columns (703) are both multiple and equal; When the limiting column (703) is inserted into the limiting hole (6012), the first through hole (7011) provided on the column (701), the second through hole (6013) provided on the second plug-in block (601), and the third through hole (3021) provided on the first plug-in board (302) are coaxially arranged.

8. The pretreatment filtration device for filtering sewage suspended solids according to claim 7, wherein: The fourth mounting member (8) comprises a cover plate (801) and a fourth reinforcing plate (802) which are vertically fixedly connected, the third mounting position being configured as a fourth slot (7012) for a portion of the fourth reinforcing plate (802) to be plugged into, a first threaded hole (7013) being provided at one end of the column (701) away from the limiting column (703), and when a portion of the fourth reinforcing plate (802) is plugged into the fourth slot (7012), a fourth through hole (8011) provided on the cover plate (801) is coaxially arranged with the first threaded hole (7013); The fourth reinforcing plate (802) is provided with a fourth connecting ear hole (8021).

9. A pretreatment filtration device for filtering sewage suspended solids according to claim 6, characterized in that: Also includes a guide mechanism (9); The guiding mechanism (9) is installed on the second connecting rib plate (602). The guiding mechanism (9) includes a hanging member (901), an angle adjusting component (902), and a guiding plate (903). Hanging ears (904) are provided at both ends of the hanging member (901) arranged oppositely along its length. At the end face of the second connecting rib plate (602) facing away from the second reinforcing plate (603), a receiving block (604) is provided, and a receiving groove (6041) for receiving the hanging ear (904) is provided on the receiving block (604). A hanging groove (9011) corresponding to the second connecting rib plate (602) is provided on the hanging member (901). A threaded post (605) is further provided on the receiving block (604), and a second threaded hole (6051) communicating with the receiving groove (6041) is provided inside the threaded post (605). A fastening screw (905) extends into the receiving groove (6041) through the second threaded hole (6051), and an abutting groove (9041) corresponding to the fastening screw (905) is provided on the hanging ear (904). The angle adjusting component (902) includes a rotating rod (9027), a first base (9021), a second base (9022), a third base (9023), and a return spring (9024). Through holes for the rotating rod (9027) to pass through are provided on the first base (9021), the second base (9022), and the third base (9023), and bushings are installed inside the through holes. A first engaging block (9025) is fixedly connected to the rotating rod (9027). A second engaging block (9026) corresponding to the first engaging block (9025) is fixedly connected to the second base (9022). First engaging teeth (90251) are provided on the first engaging block (9025), and second engaging teeth (90261) adapted to the first engaging teeth (90251) are provided on the second engaging block (9026). A through hole for the rotating rod (9027) to pass through is provided on the second engaging block (9026). The return spring (9024) is sleeved on the rotating rod (9027), one end of the return spring (9024) abuts against the first base (9021), and the other end abuts against the first engaging block (9025). The rotating rod (9027) is fixedly connected to the guiding plate (903). A pull ring (906) is provided at one end of the rotating rod (9027) facing away from the third base (9023).

10. A pretreatment filtration device for filtering sewage suspended solids according to claim 1, characterized in that: Hanging plates (108) are installed on both inner wall surfaces of the first chamber (101) arranged oppositely along its width direction. Hanging ears (109) for connecting the mesh body of the filter screen (2) are provided on the lower surface of the hanging plates (108).

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