A kind of grid hole plate suitable for high suspended solids sewage grating equipment

Abstract

The utility model discloses a grid hole plate suitable for high suspended matter sewage grid equipment, including the grid plate body of L shape, the upper portion and the side portion of grid plate body are opened with top placing groove, side placing groove, and the side placing groove, top placing groove are supported with the side grid body and top grid body of corrosion -resistant through the quick dismounting replacement of plug -in rod structure, the utility model discloses through the corrosion -resistant side grid body and top grid body of quick dismounting replacement through the plug -in rod structure of L shape's grid plate body setting, realize local replacement through detachable design, solved the problem of high maintenance cost of traditional integrated grid plate, has the advantage of solving the grid plate blockage, corrosion problem, reduces maintenance cost, improves sewage treatment efficiency, and the grid hole of 6 10mm big aperture is opened to the side grid body and top grid body simultaneously, significantly reduces the winding blockage problem of the eye of small fiber impurities, and the balance of carbon nitrogen ratio of water treatment is strengthened.

Description

Technical Field

[0001] This utility model relates to the field of water treatment bar screens, specifically to a bar screen plate suitable for wastewater bar screen equipment with high suspended solids. Background Technology

[0002] Internal flow perforated plate type medium and fine bar screens are key front-end equipment in wastewater treatment. They consist of multiple L-shaped bar screens hinged to a rotating chain to form a closed filtration system. Driven by a motor, the bar screens achieve solid-liquid separation through continuous cyclical motion: liquid is discharged through the bar screen holes, while solid impurities fall into the sludge tank by gravity. Currently, bar screens mainly intercept impurities with a diameter greater than 6cm (medium bar screen) and 3cm (fine bar screen), with medium and fine bar screens being particularly important for protecting subsequent processes.

[0003] In recent years, wastewater treatment systems have faced severe challenges: some wastewater treatment plants have reached full capacity daily, with average influent suspended solids (SS) concentrations reaching as high as 700 mg / L, exceeding design standards by more than double. Existing 3-6 mm small-aperture bar screens have significant drawbacks when dealing with wastewater with high SS concentrations: frequent screen blockage leads to poor influent flow and system sludge buildup; stainless steel bar screens suffer severe corrosion, increasing the damage rate of the backplate and mesh structure; excessive interception causes an imbalance in the downstream carbon-to-nitrogen ratio, which, while beneficial for the physical interception of COD and ammonia nitrogen, affects overall treatment efficiency. More seriously, traditional integrated bar screens require complete replacement after damage, resulting in high maintenance costs and disrupting the continuity of wastewater treatment.

[0004] To address the aforementioned issues, existing technologies urgently need improvement. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a perforated plate for use in wastewater bar screens with high suspended solids.

[0006] This utility model is achieved through the following technical solution:

[0007] A perforated grid plate suitable for high suspended solids wastewater screening equipment includes an L-shaped grid plate body. The upper part and the side of the grid plate body are provided with a top placement groove and a side placement groove. The side placement groove and the top placement groove are supported by a side grid body and a top grid body that can be quickly disassembled and replaced by a rod structure. The side grid body and the top grid body are provided with a number of grid holes for filtration.

[0008] Further optionally, the side placement groove and the top placement groove are provided with a stop groove, and the side of the side grid body and the bottom of the top grid body are provided with a stop boss that engages with the stop groove.

[0009] Further optionally, the insert structure includes several insertion tube holes on the side grid body and the top grid body, and several longitudinal connecting holes and transverse connecting holes corresponding to the insertion tube holes on the side placement groove and the top placement groove, respectively passing through the insertion tube holes to fix the longitudinal threaded rod and transverse threaded rod to the side grid body and the top grid body.

[0010] Alternatively, the transverse threaded rods and longitudinal threaded rods can be inserted and fixed along the apex corner joint of the L-shaped grating body.

[0011] Further optionally, the insertion tube includes a tube embedded in the side grid body and the top grid body, with an integral support bar at the top of the tube, and corresponding transverse threaded rods and longitudinal threaded rods passing through the tube.

[0012] Alternatively, the grating body may be made of stainless steel frame metal, while the side gratings and top gratings may be made of non-metallic materials.

[0013] Alternatively, the aperture of the grille holes can be 6-10 mm.

[0014] Alternatively, the sides of the grating body may be provided with connecting lugs that are hinged to the rotating chain.

[0015] Compared with existing technologies, the beneficial effects of this utility model are as follows: This utility model sets corrosion-resistant side and top grid bodies that can be quickly disassembled and replaced via a rod structure on the L-shaped grid body. The detachable design enables partial replacement, solving the problem of high maintenance costs of traditional integrated grids. It has the advantages of solving grid blockage and corrosion problems, reducing maintenance costs, and improving sewage treatment efficiency. At the same time, the side and top grid bodies have 6-10mm large-diameter grid holes, which significantly reduces the problem of fine fibrous impurities entanglement and blockage of the holes, ensuring the balance of carbon and nitrogen ratio in subsequent water treatment. Attached Figure Description

[0016] Figure 1 This is an exploded view of the grating structure of this utility model;

[0017] Figure 2 yes Figure 1 Enlarged view of a local structure in the diagram;

[0018] Figure 3 This is a schematic diagram of the insertion hole structure of the top grid body;

[0019] Figure 4 This is a schematic diagram of the connection between the practical grating plate and the rotating chain;

[0020] In the figure: 1. Grating body; 2. Side placement groove; 3. Top placement groove; 4. Side grating body; 41. Stop boss; 42. Stop groove; 5. Top grating body; 6. Insertion pipe hole; 61. Insertion pipe; 62. Support bar; 7. Longitudinal connection hole; 8. Transverse connection hole; 9. Transverse threaded rod; 10. Longitudinal threaded rod; 11. Grating hole; 12. Connecting ear plate; 13. Rotating chain. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0022] like Figure 1 As shown, a perforated grid plate suitable for high suspended solids wastewater grid equipment includes an L-shaped grid plate body. The upper part and the side of the grid plate body are provided with a top placement groove and a side placement groove. The side placement groove and the top placement groove are supported by a side grid body and a top grid body that can be quickly disassembled and replaced by a rod structure. The side grid body and the top grid body are provided with a number of grid holes for filtration.

[0023] The grating body adopts an L-shaped structure design, where the vertical and horizontal portions of the L-shape form side placement slots and a top placement slot, respectively. The side placement slots accommodate side grating bodies, and the top placement slots accommodate top grating bodies. The insert rod structure includes insertion holes and corresponding connecting holes on the grating body, which are fixed by threaded rods. As a preferred embodiment, the insertion holes can be designed as through holes or blind holes, with a diameter slightly larger than the diameter of the threaded rods for ease of installation. The grating holes are evenly distributed on the surface of the grating body, and the hole diameter can be adjusted according to actual needs. Furthermore, the grating body can be made of metal, while the grating body can be made of non-metallic materials, thereby achieving the combined use of different materials.

[0024] This technical solution solves the problem of difficult cleaning of existing bar screens after they become clogged through a detachable bar screen design. Specifically, when the bar screen openings are clogged with impurities, the bar screen can be quickly disassembled for cleaning or replacement without needing to replace the entire bar screen. The insert rod structure design ensures both installation stability and ease of disassembly. Compared to existing technologies, this solution significantly improves maintenance efficiency, reduces maintenance costs, and maintains good filtration performance. Furthermore, the combination of different materials ensures structural strength while reducing overall weight, which helps extend the equipment's service life.

[0025] like Figure 2 As shown, this application further proposes that the side placement groove and the top placement groove have stop grooves on the upper part, and the side of the side grid body and the lower part of the top grid body are provided with stop bosses that engage with the stop grooves.

[0026] The mating structure of the stop groove and the stop boss can be in the form of a dovetail groove or a T-groove. Specifically, the depth of the stop groove can be 3-5mm, and the width can be 8-12mm; the height of the stop boss can match the groove depth, and the width can be slightly less than the groove width to ensure assembly clearance. As a preferred embodiment, the stop groove can be machined into a 45° chamfer structure, and the stop boss can be correspondingly provided with a 45° bevel for easy assembly guidance. Furthermore, the contact surfaces of the stop groove and the stop boss can be coated with a wear-resistant coating, such as tungsten carbide spraying.

[0027] This technical solution utilizes the interlocking fit between the stop groove and the stop boss to pre-position the bar screen before the insert rod structure is fixed, effectively preventing misalignment during installation. The stop structure disperses stress when subjected to water flow impact, preventing the insert rod structure from bearing stress alone. This ensures both ease of bar screen assembly and disassembly and improves the overall structural stability. Compared to existing technologies, this dual-fixation method is particularly suitable for wastewater treatment with high suspended solids, effectively addressing mechanical vibration issues caused by frequent start-ups and shutdowns.

[0028] like Figure 2 As shown, this application further proposes that the insertion rod structure includes a plurality of insertion tube holes opened on the side grid body and the top grid body, and a plurality of longitudinal connecting holes and transverse connecting holes corresponding to the insertion tube holes opened on the side placement groove and the top placement groove, respectively passing through the insertion tube holes to fix the longitudinal threaded rod and the transverse threaded rod to the side grid body and the top grid body.

[0029] The insertion holes can be either separate or integrated. Specifically, a separate structure allows for fixing the holes to the grid body via welding or bolting; an integrated structure is formed directly onto the grid body through casting or stamping. The arrangement direction of the longitudinal and transverse connecting holes must be consistent with the extension direction of the apex angle of the L-shaped grid plate body, with the longitudinal connecting holes distributed vertically and the transverse connecting holes distributed horizontally. As a preferred embodiment, a wear-resistant bushing can be installed inside the insertion hole to reduce wear on the threaded rod.

[0030] This technical solution solves the problem of traditional bar screens easily shifting or detaching under sewage impact by using a multi-directional threaded rod cooperative fixing method. Specifically, the longitudinal and transverse threaded rods form a spatially intersecting fixing network, making the bar screen more evenly stressed when subjected to water flow impact; the precise alignment design of the insertion pipe holes and connection holes avoids stress concentration caused by installation deviations; and the threaded connection method facilitates disassembly and maintenance, making it particularly suitable for sewage treatment scenarios with high suspended solids content. Compared with existing technologies, this structure maintains the advantage of quick assembly and disassembly while significantly improving the structural stability of the bar screen in dynamic water flow, and can adapt to high suspended solids conditions of 700 mg / L or higher without the need for additional reinforcement components.

[0031] like Figure 1 As shown, this application further proposes that the transverse threaded rod and the longitudinal threaded rod be inserted and fixed along the apex corner joint of the L-shaped grating plate body, which facilitates operation in subsequent replacements.

[0032] Specifically, the threaded rods of the transverse and longitudinal directions are aligned with the extension direction of the apex corner of the L-shaped grating body. In a preferred embodiment, the transverse and longitudinal threaded rods can be threaded along the boundary line between the horizontal and vertical portions of the L-shaped grating body, respectively. Thus, the threaded directions of the transverse and longitudinal threaded rods match the structural shape of the L-shaped grating body, making the threaded rods more securely fixed.

[0033] To address this, the transverse and longitudinal threaded rods are inserted and fixed along the apex corner of the L-shaped grating body. This better adapts to the structural characteristics of the L-shaped grating body and improves the fixing effect of the threaded rods. Furthermore, the direction of the threaded rods matches the structural shape of the grating body, avoiding unnecessary stress concentration during fixing and thus extending the service life of both the threaded rods and the grating body. This insertion method also simplifies the installation process and improves the efficiency of grating assembly and disassembly.

[0034] like Figure 3 As shown, this application further proposes that the insertion tube hole includes a tube embedded in the side grid body and the top grid body, the top of the tube is provided with an integral support bar, and the tube is provided with corresponding transverse threaded rods and longitudinal threaded rods.

[0035] Specifically, the insertion tube is made of metal, with its inner diameter fitting a clearance fit with the outer diameter of the threaded rod, the clearance being controlled within the range of 0.1-0.3mm. The support strip is fixedly connected to the insertion tube by welding, and the width of the support strip is 1.2-1.5 times the outer diameter of the insertion tube. As a preferred embodiment, the bottom of the insertion tube has a guide slope with an angle of 30-45 degrees to facilitate the insertion of the threaded rod. Furthermore, the outer surface of the insertion tube can be provided with anti-slip textures, with a texture depth of 0.2-0.5mm, to enhance the bonding force with the grid body.

[0036] Therefore, this technical solution, through the integrated design of the insert and support bar, achieves rapid positioning and installation of the grid body while ensuring structural strength. The support bar effectively disperses the tightening force of the threaded rod, preventing localized deformation of the grid body; the guide bevel design of the insert significantly reduces assembly difficulty, allowing maintenance personnel to complete the replacement operation without the aid of special tools. Compared with existing technologies, this structure solves the problem of wear on mounting holes caused by repeated disassembly and assembly of traditional grid bodies, while also extending the service life of non-metallic grid bodies by optimizing stress distribution.

[0037] Furthermore, this application also proposes that the grating body is made of stainless steel frame metal, while the side gratings and top gratings are made of non-metallic materials.

[0038] Specifically, the stainless steel frame metal possesses high strength and corrosion resistance, enabling it to withstand the impact of highly suspended wastewater and the long-term effects of corrosive substances. Non-metallic materials can be selected from engineering plastics or composite materials, such as polypropylene, polyethylene, or glass fiber reinforced plastics, which are lightweight, corrosion-resistant, and easy to process. As a preferred embodiment, the surface of the non-metallic materials can be treated with an anti-fouling coating to reduce impurity adhesion. Thus, the combination of metal and non-metal ensures the stability of the overall structure while reducing the weight and maintenance costs of the grating.

[0039] To address this issue, this technical solution utilizes differentiated material design to resolve the problem of corrosion and damage to metal components in existing bar screens under high-pressure water conditions. The stainless steel frame ensures the durability of the main structure, while the non-metallic bar screen reduces equipment load and lowers the risk of clogging. Compared to existing technologies, this solution significantly extends the service life of the bar screen in high-pressure, high-suspended-solids water, and the ease of replacement of the non-metallic bar screen improves maintenance efficiency. Furthermore, the elastic properties of the non-metallic material reduce impact damage from solid impurities, thereby lowering the probability of bar screen hole deformation.

[0040] Furthermore, this application also proposes that the aperture of the grille holes be 6-10 mm.

[0041] Specifically, the screen openings are located on the side and top screen bodies to filter suspended solids in wastewater. The opening diameter range is determined through precise calculations to ensure sufficient flow rate while effectively intercepting impurities of the target size. As a preferred embodiment, the opening diameter can be an intermediate value of 7mm or 8mm, achieving a balance between filtration efficiency and anti-clogging performance. Furthermore, the opening shape can be designed as circular, elliptical, or polygonal, with circular openings being the simplest to manufacture. The spacing between the openings is typically set to 1.2-1.5 times the opening diameter to ensure structural strength.

[0042] Therefore, this technical solution optimizes the size of the screen openings, providing a more reasonable range of opening size selection compared to the frequent clogging caused by the commonly used 3mm small opening diameter in existing technologies. Specifically, an opening diameter of 6-10mm effectively intercepts debris larger than 6cm in diameter, while significantly reducing the entanglement and clogging of the openings by fine fibrous impurities. Compared to the 3mm opening diameter mentioned in the background technology, this solution increases the water flow rate by approximately 300%, maintaining continuous and stable filtration performance even in water with high suspended solids (SS) values ​​as high as 700mg / L. Furthermore, the appropriately increased opening diameter reduces resistance to water flow, thereby minimizing impact damage to the screen structure.

[0043] like Figure 4 As shown, this application further proposes that the two ends of the side of the grating body are provided with connecting ear plates that are hinged to the rotating chain.

[0044] The connecting lugs can be welded or bolted to the side of the grating body, and their thickness is typically 5-8mm to maintain sufficient strength. The connecting lugs have hinge holes with a diameter of 12-16mm, into which copper bushings or needle roller bearings can be installed to reduce frictional loss. As a preferred embodiment, the connecting lugs are integrally cast from the same stainless steel material as the grating body, and the edges of the hinge holes are chamfered to avoid stress concentration. The arrangement of the connecting lugs must match the link spacing of the rotating chain; typically, 2-4 hinge points are provided to ensure balanced force distribution.

[0045] This technical solution achieves a reliable hinged connection between the grating plate and the rotating chain by using dedicated connecting lugs. Specifically, the rigid connection of the connecting lugs effectively disperses the impact load during chain transmission, avoiding deformation caused by direct force on the grating plate itself. Compared to the traditional method of binding with steel wire ropes, the hinged structure keeps the grating plate stable during rotation, preventing misalignment and blockage of the grating holes due to shaking. The standardized design of the connecting lugs also facilitates quick replacement and maintenance of individual grating plates. When corrosion damage occurs, replacement can be completed simply by disassembling the hinge pin, significantly improving maintenance efficiency. This structure is particularly suitable for wastewater treatment scenarios with high suspended solids, and can withstand long-term cyclic loads without connection failure.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A perforated grid plate suitable for use in wastewater bar screens with high suspended solids, characterized in that: The system includes an L-shaped grid plate body (1), with a top placement groove (3) and a side placement groove (2) on the upper and side parts of the grid plate body (1). The side placement groove (2) and the top placement groove (3) support a side grid body (4) and a top grid body (5) that can be quickly disassembled and replaced by a rod structure. The side grid body (4) and the top grid body (5) have a number of grid holes (11) for filtering.

2. The perforated plate for a high-suspended-solids wastewater screen as described in claim 1, characterized in that: The side placement groove (2) and the top placement groove (3) are provided with a stop groove (42) on the upper part, and the side of the side grid body (4) and the lower part of the top grid body (5) are provided with a stop boss (41) that is engaged with the stop groove (42).

3. A perforated plate for a high-suspended-solids wastewater screen as described in claim 1, characterized in that: The insertion rod structure includes several insertion tube holes (6) on the side grid body (4) and the top grid body (5). The side placement groove (2) and the top placement groove (3) are provided with several longitudinal connecting holes (7) and transverse connecting holes (8) corresponding to the insertion tube holes (6). The longitudinal connecting holes (7) and transverse connecting holes (8) pass through the insertion tube holes (6) to fix the longitudinal threaded rod (10) and transverse threaded rod (9) of the side grid body (4) and the top grid body (5) respectively.

4. A perforated plate for a high-suspended-solids wastewater screen as described in claim 3, characterized in that: The transverse threaded rod (9) and the longitudinal threaded rod (10) are inserted and fixed along the top corner joint of the L-shaped grid plate body (1).

5. A perforated plate for a high-suspended-solids wastewater screen as described in claim 3, characterized in that: The insertion tube hole (6) includes an insertion tube (61) embedded inside the side grid body (4) and the top grid body (5). An integral support bar (62) is provided on the top of the insertion tube (61). A corresponding transverse threaded rod (9) and a longitudinal threaded rod (10) pass through the insertion tube (61).

6. A perforated plate for a high-suspended-solids wastewater screen as described in claim 1, characterized in that: The grating body (1) is made of stainless steel frame metal, and the side grating body (4) and top grating body (5) are made of non-metallic materials.

7. A perforated plate for a high-suspended-solids wastewater screen as described in claim 1, characterized in that: The aperture of the grid hole (11) is 6-10mm.

8. A perforated plate for a high-suspended-solids wastewater screen as described in claim 1, characterized in that: The two ends of the side of the grating body (1) are provided with connecting ear plates (12) that are hinged to the rotating chain (13).

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