Screening device, screening element and method for manufacturing a screening device

Abstract

The invention relates to a screening device (1) for separating screening material from a flowing liquid contaminated with screening material, for example wastewater, having a frame (2) and a screening grid (3) with a plurality of screening elements (4) fixed to the frame (2). Furthermore, the invention relates to a screening element (4) for the screening device (1) and a method for producing the screening device (1). It is proposed for the screening device (1) that the screening grid (3) and the screening elements (4) are at least partially curved, in particular in the shape of a circular arc, and that the screening elements (4) have a plurality of form-fit portions (5) with which the screening elements are fastened to the frame (2) via a plurality of fastening means (6) of the screening device (1).

Description

Technical Field

[0001] This invention relates to a screening apparatus for separating a material from a flowing liquid, such as wastewater, contaminated by the material being screened. The apparatus has a frame and a screening grid with multiple screening elements fixed to the frame. Furthermore, this invention relates to a screening element for the screening apparatus and a method for manufacturing the screening apparatus. Background Technology

[0002] Conventional screening devices are used, for example, to remove coarse contaminants, particularly from municipal wastewater. These contaminants may include, for example, objects, paper, and plant debris. For this purpose, the contaminated liquid is directed onto screening grids, which trap the coarse contaminants. The pre-cleaned liquid can then undergo further cleaning procedures, for example. The contaminants trapped by the screening grids can be removed and disposed of separately, for example, by a suitable mechanism. Such devices are disclosed, for example, in document DE 10 2015 108006 A1.

[0003] Screening grids in known screening devices typically consist of multiple screening elements. These elements must be designed to be stable themselves to prevent damage upon impact with contaminants, and they must also be securely connected to the frame of the screening device to prevent loosening upon impact. Currently, the screening elements are welded separately to the frame, which complicates the manufacturing process of the screening grid. Furthermore, the welded connections significantly increase the difficulty of maintaining potentially damaged screening grids. Summary of the Invention

[0004] Therefore, the object of the present invention is to improve upon the known screening apparatus, screening elements for the screening apparatus, and manufacturing method in view of the above-mentioned disadvantages.

[0005] This objective is achieved by a screening device, screening elements, and a method for manufacturing the screening device, having the features of the independent claims. Advantageous embodiments are the subject of the corresponding dependent claims.

[0006] The screening apparatus according to the invention is suitable for separating the material from a flowing liquid contaminated with the material to be screened, such as wastewater. The screening apparatus includes a frame and a screening grid with multiple screening elements fixed to the frame. According to the invention, the screening grid and screening elements are at least partially curved, particularly arcuate, and the screening elements have multiple form-fitting portions, by which the screening elements are fastened to the frame by multiple fastening devices of the screening apparatus.

[0007] The proposed curved structure of the screening grid and screening elements allows for targeted collection of contaminants, for example, in specific areas of the screening grid. Furthermore, the contaminants can be removed, for example, by a mechanism extending along the curve. This improves the cleanliness of the screening device and reduces the likelihood of grid clogging. The screening elements can be, for example, planar in construction, wherein the thickness of the screening element is significantly less than its height and width. During operation, the surface of the screening element is specifically oriented parallel to the liquid flow. This imparts high stability to the screening element upon impact with contaminants and avoids turbulence in the liquid flow. The curvature of the screening element is specifically designed to be parallel to the surface of the screening element. Preferably, the curve does not cause liquid flow deflection. The curve can, for example, have a constant radius or can have segmented radii of curvature. For arc-shaped curves, the curve preferably has a substantially constant radius of curvature.

[0008] By using form-fitting parts and fastening devices instead of welding connections, the assembly of screening elements is simplified. In particular, the screening elements are detachably connected to the fastening devices, allowing for the maintenance and replacement of individual or grouped screening elements without replacing the entire screening grid. The screening elements, fastening devices, and / or frame are preferably made of stainless steel.

[0009] The form-fitting parts can be designed as lugs, hooks, tenons, and / or guides, which work in conjunction with the corresponding shaped receiving parts of the fastening device. The fastening device is preferably at least partially fixedly connected to the frame, particularly by welding. In addition to the form-fitting connection between the screening element and the fastening device, a force-transmitting connection, especially by clamping, can also be considered.

[0010] Screening devices can typically be configured to deflect the liquid flow, thereby achieving, for example, gentler trapping of contaminants. For instance, in the area of ​​the screening device, the flow direction of the liquid flow can be deflected at an angle of approximately 90°. The screening elements are then oriented, for example, perpendicular to the initial liquid flow. For this purpose, the screening device may include, for example, baffles for the liquid flow. It is conceivable to reinforce the first and / or last screening elements of the screening grid, for example, by giving them a greater thickness compared to the other screening elements. Thus, these screening elements can withstand the load peaks generated in these areas. Furthermore, it may be advantageous to seal the gap between the screening grid and the frame with suitable devices, thereby preventing the accumulation of screened material between the screening grid and the frame.

[0011] Advantageously, the screening device includes at least one cleaning rake, and more particularly multiple cleaning rakes, for removing the screened material. These cleaning rakes are movable along the screening grid by means of at least one transmission element. This allows for continuous and automated removal of the trapped screened material from the surface of the screening grid. The curvature of the screening grid facilitates the removal process, as gravity can additionally promote the removal of the screened material. Specifically, the cleaning rake engages with the screening element to also remove any screened material adhering there.

[0012] At least one drive element may be configured, for example, as a conveyor chain or a chain of rollers, which move, for example, along the guide of the screening device. In particular, the drive element is configured as a circulating drive element, guided, for example, by a corresponding deflection device, particularly a deflection roller. The cleaning rake is preferably fastened to the drive element. The drive element may be driven, for example, by an electric motor.

[0013] The movement of the cleaning rake can be continuous or periodic, and the speed of movement can be adjusted, in particular, according to the quality of the material being screened. The cleaning rake can be constructed as a comb-like structure, with its teeth engaging in the screening element as already described. Here, the spacing is chosen to ensure reliable capture of the screened material without placing a mechanical load on the screening element.

[0014] Screening devices may include, for example, one or more scrapers that unload the captured screened material into a collection container or onto a conveyor belt at a designated location, such as at the discharge section of the screening device.

[0015] Particularly advantageous is that the screening element has more than two, preferably at least four, form-fitting parts, and the screening device includes more than two, preferably at least four, fastening devices. Using more than two form-fitting parts for each screening element, combined with a corresponding number of fastening devices, ensures that the screening element is particularly stable and uniformly fixed to the frame. Through this multiple fastening, the mechanical load that occurs during operation is evenly distributed across multiple fastening points. This prevents the screening element from curling or deforming, even under high loads of screened material or strong flows of the liquid to be cleaned. Here, the form-fitting parts can, for example, be symmetrically distributed along the length of the screening element, thereby achieving a balanced load distribution.

[0016] Implementations with four or more fastening points offer the additional advantage that individual fastening points can be loosened during maintenance without losing the position of the screening element, as the remaining fastening points ensure sufficient fixation. Specifically, the screening element may include six fastening devices, and the screening device may include six fastening devices.

[0017] Also advantageously, the fastening device forms a support point for the screening element on the side of the screening grid opposite to the liquid flowing in during the specified operation of the screening device. Arranging the fastening device on the side of the screening grid opposite to the flow direction provides a predetermined fit for the screening element, thereby supporting the screening element against the flow forces of the liquid to be cleaned.

[0018] Furthermore, the flow-averse arrangement of the fastening device ensures that it is not directly exposed to the screening material, thereby reducing wear on the fastening device. This arrangement also improves the accessibility of the fastening device for maintenance and inspection.

[0019] Furthermore, it is advantageous that the fastening device includes a preferably fixed receiving element and a preferably removable clamping element. The combined action of the fixed receiving element and the removable clamping element allows for safe and easy maintenance of the screening element. The fixed receiving element serves in particular as a constant reference position for the precise orientation of the screening element, while the removable clamping element provides the actual fixation.

[0020] The receiving element can be specifically configured to enable pre-positioning of the screening element, thereby simplifying assembly. The receiving element and clamping element can, for example, be configured to fit relative to each other in shape. The clamping element can specifically be configured as a clamping plate. It is conceivable to provide multiple clamping elements for each receiving element in order to enable group maintenance of the screening element.

[0021] The combination of the fixed receiving element and the detachable clamping element can, for example, allow a certain degree of relative movement between the screening element and the frame, for example, to compensate for thermally induced length variations or to absorb manufacturing tolerances. The clamping connection can be designed to allow these movements within specified limits without negatively impacting reliable fixation.

[0022] A particular advantage is that the receiving element includes at least one hole, particularly a threaded hole. This hole here forms, for example, a standardized interface for receiving various types of fastening elements. The threaded hole allows, for example, precise and controlled adjustment of the clamping force via a corresponding threaded element. The receiving element may have multiple holes, which enable distributed clamping force or redundant fastening of the clamping elements.

[0023] Another advantage is that the clamping element includes at least one through-hole, particularly for the screw. This through-hole enables a connection between the clamping element and the receiving element, for example, via any fastening element. In particular, the helical connection between the clamping element and the receiving element forms a standardized and easily maintained detachable connection. The clamping force can also be adjusted within a range by the torque used during screwing. The through-hole can, for example, be configured such that the screw head shape fits against it. For this purpose, the through-hole includes, for example, a hole, particularly a countersunk hole. The contact surface around the through-hole can be designed, in particular, as a planar or structured surface to optimize the distribution of the clamping force.

[0024] Multiple through-holes can be provided to evenly distribute the clamping force or to achieve redundant tightening. The combination of through-holes and screws allows for controlled removal of the clamping element, where the screws can act as guides and prevent accidental dislodgement. Through-holes can also be designed to form anti-torsion portions for the clamping element, for example, through non-circular shapes or additional guide elements.

[0025] A particular advantage is that the receiving element has a comb-like structure. This comb-like structure provides a defined receiving structure for the shape-fitting portion of the screening element, stabilizing the screening element in a certain direction. Furthermore, the comb-like structure enables precise positioning of multiple screening elements arranged side-by-side and ensures their precise orientation relative to each other. The comb-like structure can here be formed by parallel-arranged webs that define guide grooves or receiving bag grooves. The size of the central gap in the comb-like structure preferably allows for convenient insertion of the shape-fitting portion.

[0026] The comb-like structure can be designed as an integral part housing the components, or as a separate, replaceable component. The geometry of the comb-like structure is preferably chosen to avoid creating areas where dirt may accumulate.

[0027] Another advantage is that the clamping element includes multiple openings for the form-fitting portion. These openings allow the form-fitting portion to pass directly through, thereby achieving form-fitting fixation of the screening element. Preferably, the openings in the clamping element correspond to the comb-like structure that receives the element, and together provide precise guidance for the form-fitting portion.

[0028] The opening can be designed as a through-hole, its shape and size matching the geometry of the form-fitting part. The arrangement of the opening in the clamping element specifically corresponds to the location of the form-fitting part, achieving stress-free assembly. The opening can have an interference fit to compensate for manufacturing tolerances and facilitate assembly.

[0029] The screening element according to the invention is suitable for screening devices, particularly those described above, wherein the described features can be implemented individually or in any combination. According to the invention, the screening element is characterized in that it is at least partially curved, particularly arcuate in shape, and has a plurality of form-fitting portions for fastening to the fastening device of the screening device.

[0030] The curved, particularly arc-shaped, construction of the screening element can, as already described, facilitate the efficient collection and removal of the screened material. Multiple shaped fittings ensure reliable and, in particular, detachable connection to the fastening devices of the screening unit without the need for welding.

[0031] The curved section can have a constant radius or a variable curvature distribution. The screening element is preferably made of a corrosion-resistant material, such as stainless steel.

[0032] The form-fitting part can be specifically constructed as an integral component of the screening element. The form-fitting part is arranged here to ensure that the screening element is in a predetermined position within the screening device.

[0033] Furthermore, it is advantageous that the screening element includes more than two, preferably at least four, form-fitting parts. By providing more than two form-fitting parts, a particularly stable and uniform fastening to the frame of the screening device is ensured. By distributing the forces that occur during operation across multiple fastening points, localized stress peaks are avoided and the mechanical load on the screening element is reduced.

[0034] The form-fitting parts can be symmetrically distributed along the length of the screening element, wherein, depending on the length of the screening element, for example, four or six form-fitting parts provide an optimal balance between stability and assembly workload. The spacing between the form-fitting parts is preferably selected to ensure uniform load distribution. The form-fitting parts can be designed, for example, as lugs, hooks, tenons, and / or guides.

[0035] Multiple fasteners further enable precise orientation of the curved screening element, as its position is determined by multiple defined points. During maintenance, the advantage of multiple fasteners is that individual fasteners can be loosened while the remaining form-fitting parts continue to hold the screening element in place.

[0036] The method according to the invention for manufacturing a screening device, particularly one constructed according to the foregoing description, wherein the described features can be implemented individually or in any combination, comprises the following steps: providing a frame with a plurality of fastening devices; providing a plurality of screening elements constructed at least partially curved, particularly arcuate, each screening element having a plurality of form-fitting portions; placing the plurality of screening elements into the fastening devices to create a screening grid; and form-fittingly fixing the form-fitting portions to the fastening devices.

[0037] The described manufacturing method enables efficient and precise assembly of the screening device without welding. A frame with multiple fastening devices forms the basis for assembly. These fastening devices can be pre-adjusted to simplify the subsequent orientation of the screening elements.

[0038] The curved screening element is manufactured, for example, in a separate manufacturing process and has the required shape-fitting parts. The screening element is, for example, stamped or cut from sheet metal, wherein laser or water jet can be used for cutting. In particular, the screening element can be assembled from multiple parts, for example by welding, which reduces the size of the required stamping or cutting machine.

[0039] Preferably, the screening elements are arranged sequentially, with each element first loosely placed into its corresponding fastening device. The fastening device can be designed to pre-position the screening element. The screening element is secured, for example, by clamping as described above. This can be achieved, for example, by tightening clamping screws or manipulating quick-release clamps.

[0040] A particular advantage is that the step of securing the form-fitting part to the fastening device includes fixing the clamping element of the fastening device to the receiving element of the fastening device. Securing the screening element using the clamping element and the receiving element allows for controlled and precise assembly, while maintaining high operational reliability.

[0041] First, the receiving element forms a predetermined receiving position for the screening element, wherein the shape-fitting part is particularly placed in the provided receiving bag groove or guide groove. The position of the screening element is here predetermined, for example, by the geometry of the receiving element. The receiving element can preferably be designed to achieve pre-centering of the screening element.

[0042] Subsequently, the clamping element is specifically positioned to accommodate the shape-fitting portion of the screening element within the corresponding opening. The clamping force can be steplessly adjusted using suitable connecting elements, such as screws. Specifically, it can be secured by first loosely pre-positioning, and then applying the final clamping force.

[0043] Furthermore, it is advantageous that the process of providing a frame with fastening devices includes welding or screwing the frame to the fastening devices. The permanent connection formed between the frame and the fastening devices through welding or screwing creates a stable foundation for the subsequent assembly of the screening elements. Welded connections ensure that the fastening devices are durable and load-bearingly integrated into the frame structure. Screwed connections create a detachable connection, which may facilitate easier subsequent maintenance and upkeep of the screening unit. The fastening devices contribute to the stability of the frame.

[0044] The welded joint can be designed as a continuous weld, an intermittent weld, or a spot weld, with the weld type preferably adapted to the expected operating load. After welding, the fasteners can undergo mechanical post-processing to ensure the dimensional accuracy required for subsequent assembly of the screening elements. The welded joint may be equipped with a corrosion protection layer to ensure the long-term durability of the connection. The welded joint between the frame and the fasteners forms part of the load-bearing structure of the screening device and transmits the forces generated during operation to the frame. Attached Figure Description

[0045] Further advantages of the present invention are described in the following embodiments, wherein each is illustratively:

[0046] Figure 1 This is a schematic front view of a first embodiment of the screening device according to the present invention;

[0047] Figure 2 A first embodiment of the screening element according to the present invention is shown;

[0048] Figure 3 A second embodiment of the screening element according to the present invention is shown;

[0049] Figure 4 The frame of a second embodiment of the screening apparatus according to the present invention is shown;

[0050] Figure 5 The fastening device of the screening apparatus according to the invention is shown; and

[0051] Figure 6 It is an isometric view of a partial section of the connection area between the screening element and the fastening device. Detailed Implementation

[0052] In the following description of the accompanying drawings, the same reference numerals are used for the same and / or at least similar features in each drawing. Each feature, its design and / or mode of operation, is generally described in detail only when it is first mentioned. If an individual feature is not explained in detail again, its design and / or mode of operation corresponds to the design and mode of operation of a feature that has already been described and has the same function or name.

[0053] Figure 1 A schematic front view of a screening device 1 for separating screening materials from a flowing liquid (e.g., wastewater) contaminated with screening materials is shown. The screening device 1 includes a frame 2 on which an arc-shaped screening grid 3 is fixed. The screening grid 3 is composed of a plurality of screening elements 4 (see especially...) Figure 2 and Figure 3 These screening elements are planar in structure, wherein the thickness of screening element 4 is much smaller than its height and width.

[0054] The screening element 4 is provided with multiple form-fitting parts 5, which are fastened to the frame 2 by corresponding fastening devices 6. The form-fitting parts 5 are symmetrically arranged on both sides 11 of the curved screening grid 3, thereby achieving a balanced load distribution. Using form-fitting parts 5 and fastening devices 6 instead of welding connections simplifies assembly and improves the maintenance and replacement of individual screening elements 4 or groups of screening elements 4.

[0055] In this arrangement, the liquid flow should ideally originate from the direction in front of the plane of the attached drawing, but the shown screening device 1 deflects the liquid flow by approximately 90°, and then the liquid flow is guided from both sides through the screening grid 3. The faces of the screening elements 4 are correspondingly oriented parallel to the liquid flow there, which gives the screening elements 4 high stability when colliding with contaminants.

[0056] To continuously clean the screening grid 3, a plurality of cleaning rakes 7 are provided, which can move along the screening grid 3 by means of a drive element 8. The drive element 8 is configured as a circulating drive element and is guided by at least one deflecting roller 9. The drive element 8 can be driven, for example, by a motor (not shown) connected to the deflecting roller in the upper region of the screening device 1. The cleaning rakes 7 are configured, for example, as a comb-like structure, with teeth engaging in the screening element 4 to remove the screening material adhering thereto.

[0057] The arc-shaped structure of the screening grid 3 allows for targeted collection of contaminants in the lower region of the screening device 1 and facilitates removal by the cleaning rake 7, wherein the curved portion further promotes the removal process by gravity. The captured screening material is carried to the discharge section 10, where it can be unloaded, for example, into a collection container (not shown).

[0058] The fastening device 6 is arranged as a support point for the screening element 4 on the side 11 of the screening grid 3 facing away from the liquid flowing from the screening device 1 during operation. This flow-facing arrangement of the fastening device 6 ensures that it is not directly exposed to the screening material, thereby reducing wear on the fastening device 6 and improving accessibility for maintenance and inspection.

[0059] Multiple shaped fitting parts 5 and corresponding fastening devices 6 are arranged to ensure that the screening element 4 is particularly stable and uniformly fixed on the frame 2. Through this multiple fastening, the mechanical load that occurs during operation is evenly distributed among multiple fastening points, thereby preventing the screening element 4 from curling or deforming even under high screening material loads or strong flow of the liquid to be cleaned.

[0060] Figure 2 A first embodiment of the screening element 4 according to the present invention is shown. A plurality of such screening elements 4 are formed, for example... Figure 1The screening grid 3 of the intermediate screening device 1. The screening element 4 is U-shaped with segmented arc-shaped bends, wherein the bends have a roughly constant radius. The screening element 4 is planar, wherein the thickness of the screening element 4 is much smaller than its height and width.

[0061] A plurality of form-fitting parts 5 are symmetrically arranged on the screening element 4. These form-fitting parts are used to detachably fasten to the fastening device 6 of the screening device 1. These form-fitting parts 5 are constructed as integral components of the screening element 4 and are arranged to ensure that the screening element 4 is in a predetermined position in the screening device 1.

[0062] In the illustrated embodiment, the screening element 4 has six form-fitting parts 5, which are arranged in pairs on both sides of the screening element 4. This multiple fastening ensures particularly stable and uniform fastening to the frame 2 of the screening device 1. By distributing the forces that occur during operation to the six fastening points, local stress peaks are avoided and the mechanical load on the screening element 4 is reduced.

[0063] The form-fitting parts 5 are designed as hook-shaped structures, which work in conjunction with the correspondingly shaped receiving parts of the fastening device 6. This design achieves a secure and easy-to-maintain fastening without the need for welding connections.

[0064] The bending direction of the screening element 4 is parallel to its surface, and in the installed state, it facilitates the targeted collection and removal of screened material. The screening element 4 is preferably made of a corrosion-resistant material (e.g., stainless steel) to meet the requirements of continuous operation with contaminated liquids.

[0065] Figure 3 An alternative embodiment of the screening element 4 according to the invention is shown. The screening element 4 is constructed in a completely arcuate curve, and the curve also has a substantially constant radius.

[0066] Unlike the first embodiment, this screening element 4 has four shape-fitting portions 5, which are arranged in pairs on the side regions of the curved screening element 4. These shape-fitting portions 5 are symmetrically distributed along the length of the screening element 4, thereby achieving a balanced load distribution.

[0067] In this embodiment, the shape-fitting part 5 is also constructed as an integral part of the screening element 4 and has a hook-shaped structure. In this embodiment, the screening element 4 is also planar in construction, wherein the thickness of the screening element 4 is much smaller than its height and width.

[0068] Figure 4 A perspective view shows the frame 2 of a second embodiment of the screening device 1. The frame 2 has an annular base structure on which multiple fastening devices 6 are arranged. The frame 2 is used, for example, to accommodate... Figure 3Multiple screening elements 4 in the embodiments.

[0069] Fastening devices 6 are distributed along the lower periphery of the frame 2 and each has holes 14, which are designed here as threaded holes, for example. The threaded holes form standardized interfaces for accommodating various types of fastening elements. In the two-piece design of the fastening devices 6 (see...), Figure 5 In the example shown, the element is, for example, the receiving element 12 used for the screening element 4.

[0070] The fastening device 6 is securely connected to the frame 2, particularly by welding, thus providing a stable foundation for the subsequent assembly of the screening elements 4. The permanent connection between the frame 2 and the fastening device 6 via welding ensures that the fastening device 6 is durable and load-bearingly integrated into the frame structure.

[0071] The annular design of the frame 2 corresponds to the arc-shaped structure of the screening element 4, thereby facilitating the efficient collection and removal of screened material during operation. The fastening device 6 is arranged to enable precise orientation of the screening element 4 while also providing easy access for maintenance and inspection.

[0072] Figure 5 A detailed diagram of the fastening device 6 of the screening device 1 is shown. In this example, the fastening device 6 includes a receiving element 12 and a clamping element 13, which together achieve reliable and easy-to-maintain fastening of the screening element 4. The receiving element 12 has, for example, a comb-like structure that laterally secures the screening element 4 and enables precise positioning of the screening element 4 during assembly of the screening device 1.

[0073] The clamping element 13 has multiple openings 17 that allow direct insertion of the form-fitting part 5, thereby ensuring the form-fitting fixation of the screening element 4. For connecting the clamping element 13 to the receiving element 12, multiple through-holes 15 with countersunk holes 16 are provided. These through-holes 15 are configured such that the screw heads of screws fit together in a form-fitting manner.

[0074] This structure enables a detachable connection between the screening element 4 and the fastening device 6, which allows for easy maintenance and replacement of individual screening elements 4 or groups of screening elements 4 without replacing the entire screening grid.

[0075] Figure 6 A partially sectional isometric view shows the connection area between the screening grid 3, which has multiple screening elements 4, and the fastening device 6. Each screening element 4 has a form-fitting part 5, which is connected to the fastening device 6.

[0076] The fastening device 6 includes a receiving element 12 and a clamping element 13, which together form a form-fitting and detachable connection with the screening element 4. Here, the form-fitting part 5 is inserted into the opening 17 of the clamping element 13. The receiving element 12 has a hole 14, while the clamping element 13 has a corresponding opening 17 for a screw 18 to pass through. The connection between the receiving element 12 and the clamping element 13 is established by a screw 18, the head of which fits into the countersunk hole 16 of the clamping element 13. The screening element 4 is secured by the comb-like structure of the receiving element 12, the form-fitting connection between the form-fitting part 5 and the opening 17 of the clamping element 13, and the helical connection between the receiving element 12 and the clamping element 13. List of reference numerals in the attached diagram: 1 Screening device 2 racks 3 Screening grid 4 Screening elements 5. Shape-fitting parts 6 Fastening devices 7 Cleaning rake 8. Transmission components 9 Deflection Rollers 10 Discharge section 11. Side view 12 Retaining elements 13 Clamping elements 14 holes 15 Pass-through part 16 Countersunk Holes 17 Opening 18. Screws.

Claims

1. A screening device (1) for separating the screened material from a flowing liquid contaminated by the screened material, such as wastewater, the screening device comprising: rack (2); and A screening grid (3) with multiple screening elements (4) fixed on the frame (2). Its features are, The screening grid (3) and the screening element (4) are at least partially curved, particularly in an arc shape, and the screening element (4) has a plurality of shape-fitting parts (5), which are fastened to the frame (2) by means of the shape-fitting parts via a plurality of fastening devices (6) of the screening device (1).

2. The screening device (1) according to claim 1, characterized in that, The screening device (1) includes at least one cleaning rake (7), and in particular multiple cleaning rakes (7), which are used to remove the screened material and are particularly capable of moving along the screening grid (3) by means of at least one transmission element (8).

3. The screening device (1) according to any one of the preceding claims, characterized in that, The screening element (4) has more than two, preferably at least four, shape-fitting parts (5), and the screening device (1) includes more than two, preferably at least four fastening devices (6).

4. The screening device (1) according to any one of the preceding claims, characterized in that, The fastening device (6) forms a support point for the screening element (4) at the side (11) of the screening grid (3) opposite to the liquid flowing in when the screening device (1) is operating as specified.

5. The screening device (1) according to any one of the preceding claims, characterized in that, The fastening device (6) includes a receiving element (12) preferably fixedly disposed and a clamping element (13) preferably detachable.

6. The screening device (1) according to claim 5, characterized in that, The receiving element (12) includes at least one hole (14), particularly a threaded hole.

7. The screening device (1) according to claim 5 or 6, characterized in that, The clamping element (13) includes at least one through portion (15) specifically for the screw (18).

8. The screening device (1) according to any one of claims 5 to 7, characterized in that, The receiving element (12) has a comb-like structure.

9. The screening device (1) according to any one of claims 5 to 8, characterized in that, The clamping element (13) includes a plurality of openings (17) for the shape-fitting portion (5).

10. A screening element (4) for use in a screening apparatus (1) particularly according to any one of the preceding claims, characterized in that, The screening element (4) is at least partially curved, particularly in an arc shape, and has a plurality of shape-fitting parts (5) for fastening to the fastening device (6) of the screening device (1).

11. The screening element (4) according to claim 10, characterized in that, The screening element (4) includes more than two, preferably at least four, shape-fitting parts (5).

12. A method for manufacturing a screening device (1) in particular according to any one of claims 1 to 9, the method comprising the following steps: - Provide a rack (2) with multiple fastening devices (6); - Provides a plurality of screening elements (4) that are at least partially curved, especially in an arc shape, each of the screening elements having a plurality of shape-fitting portions (5); - Place multiple screening elements (4) into the fastening device (6) to create a screening grid (3); and - The shape-fitting part (5) is fixed to the fastening device (6) in a shape-fitting manner.

13. The method according to claim 12, characterized in that, The step of fixing the shape-fitting part (5) to the fastening device (6) includes fixing the clamping element (13) of the fastening device (6) to the receiving element (12) of the fastening device (6).

14. The method according to claim 12 or 13, characterized in that, The step of providing a frame (2) with the fastening device (6) includes welding and / or screwing the frame (2) to the fastening device (6).

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