Industrial filter cloth
By directly machining interlocking fastening elements on the edge of the filter cloth, the problems of complex and safety hazards in fastening filter cloth in filter presses are solved, enabling fast and safe filter cloth replacement and equipment protection.
Patent Information
- Application Number
- CN202480019069.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-03-16
- Filing Date
- 2024-02-16
- Publication Date
- 2025-10-31
AI Technical Summary
The current process of fastening filter cloth in filter presses is time-consuming and labor-intensive. Using plastic cable ties poses safety hazards and can easily damage the equipment. Furthermore, replacing the filter cloth requires the use of sharp tools, making the operation complex and inconvenient.
Fastening elements and mating fastening elements are directly machined on the side and bottom edges of the filter cloth, making them interlockable and manually fastened, eliminating the need for cable ties and simplifying the operation process.
It enables quick and safe fastening and disassembly of filter cloth, reduces the risk of equipment damage, improves operational efficiency and safety, and facilitates recycling.
Smart Images
Figure CN120882467A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to filter cloths for use in filter presses, particularly chamber filter presses (also known as chamber filter presses) for filtering fluid and solid mixtures. More specifically, this invention relates to a filter cloth according to the preamble of claim 1. Background Technology
[0002] As is known from existing technology, filter presses are specifically used for separating solids and liquids. For example, a chamber filter press comprises multiple adjacent plate-like filter frames configured to press against each other to separate the solid content from the slurry or suspension fed into the chamber filter press, forming a filter cake within the filter chamber. The filter cake can be discharged from the chamber as the plate-like filter frames move apart and open. Subsequently, the filter plates close, and additional slurry or suspension is fed back into the filter chamber for the next filtration cycle.
[0003] It is also known from the prior art that each operating surface of a plate-shaped filter frame is covered with a filter cloth. The filter cloth for a filter frame can be formed by two single filter cloths attached to each other at their edges, or by a hanging filter cloth (which hangs down from the top of the filter frame and is attached around the filter frame at its edges), or by a double filter cloth (which is joined in one area by a manner commonly referred to as a "barrel neck" and then attached around the filter frame).
[0004] As is known from the prior art, different attachment types for attaching the filter cloth edges around a filter frame are achieved by providing attachment holes at the edge regions of the filter cloth. Plastic cable ties pass through the attachment holes and are fastened to attach the filter cloth to its proper position. Figure 1 schematically illustrates an example of a filter cloth 10 known in the prior art. This example is a single type of filter cloth, i.e., two filter cloths 10 are used to cover the filter frame, with one filter cloth on each operating surface of the filter frame. The edges 13, 14 of the filter cloth 10 are provided with protrusions 15 separated by recesses 16. The protrusions 15 have attachment holes 17. In addition, the bottom edges 12 of the filter cloth 10 may each have attachment holes 17. To attach the filter cloth, several plastic cable ties pass through the attachment holes 17 of the filter cloth 10 on one operating surface of the filter frame, and then through the corresponding attachment holes 17 of the corresponding edges of the filter cloth on the other operating surface of the filter frame, and are then fastened. For example, a chamber filter press may have thousands of attachment holes, resulting in thousands of plastic cable ties for the filter cloth. Filter press cloths are typically replaced periodically, sometimes every two weeks. At the end of the cloth's lifespan, these cable ties must be cut with a sharp tool, posing a safety hazard to the operator. The plastic cable ties are thin and difficult to handle, and the work is further complicated by the need for operators to wear gloves during installation. A filter frame may also be several meters high. The fastening process is time-consuming and cumbersome, especially considering the filter frame can be several meters high and the filter cloth replacement must be done while the frame is still inside the filter press. Cable ties can also fall off and get caught in the process stream, potentially damaging the filter press's pumps and the machine itself.
[0005] The purpose of this invention is to create a filter cloth that eliminates or at least minimizes the disadvantages and problems of the prior art.
[0006] In particular, an object of the present invention is to create an improved filter cloth, especially an improved filter cloth in terms of securing the filter cloth around the filter frame of a filter press. Summary of the Invention
[0007] To achieve the foregoing objectives and those that will become apparent hereinafter, the main feature of the filter cloth according to the invention is the feature of the characterizing portion of independent claim 1. Advantageous aspects and features of the invention are set forth in the dependent claims.
[0008] According to the present invention, a filter cloth for a filter press is provided, the filter press including a filter frame, one or more filter cloths including side edges and a bottom edge, and the one or more filter cloths being configured to cover the operating surface of the filter frame and being attached at least at the side edges of the one or more filter cloths, wherein the one or more filter cloths have a fastening element at at least one side edge and a mating fastening element at at least another side edge, the fastening element and the mating fastening element being fastened to each other and configured to form an attachment of the one or more filter cloths at the filter frame, the fastening element and the mating fastening element being directly machined onto the one or more filter cloths.
[0009] According to an advantageous feature of the invention, the fastening element and mating fastening element are directly processed onto the filter cloth(s) by cutting, stamping or other similar means.
[0010] According to an advantageous feature of the invention, the filter cloth(s) has a fastening element at one side edge and a mating fastening element at the other side edge.
[0011] According to an advantageous feature of the invention, the fastening element and the mating fastening element are configured to form an interlocking, advantageously openable attachment between each other.
[0012] According to an advantageous feature of the invention, the filter cloth(s) includes alternating fastening elements and mating fastening elements at at least one edge of the filter cloth(s).
[0013] According to an advantageous feature of the invention, the bottom edge and side edges of the filter cloth(s) have spaced-apart protrusions, and fastening elements and mating fastening elements are machined in connection with the protrusions.
[0014] According to an advantageous feature of the invention, the fastening element has an interlocking shape comprising a rod and an arm, such as a T-shape or an arrowhead shape.
[0015] According to an advantageous feature of the invention, the fastening element has two opposing cuts forming flaps in the rod. The flaps in the rod can advantageously be bent, but they can also be formed by non-bent (other than curved) cuts that correspondingly form an interlocking shape.
[0016] According to an advantageous feature of the invention, the mating fastening element has a cutout, advantageously a straight cutout, thereby forming a shape that matches the interlocking shape of the fastening element. Alternatively, other interlocking shapes may also be used.
[0017] According to an advantageous feature of the invention, the length of the cut of the mating fastening element is equal to or greater than the width of the rod portion of the fastening element.
[0018] According to an advantageous feature of the invention, the width between the open ends of the arms of the fastening element is equal to or greater than the width of the rod portion of the fastening element.
[0019] According to an advantageous feature of the invention, the distance between the bases (i.e., uncut portions) of the two blades formed by two opposing cuts is equal to or greater than the distance between the cuts and the outer edges of the protrusions of the mating fastening elements.
[0020] According to an advantageous feature of the invention, when covering the filter frame, the filter cloth is a single filter cloth, a double filter cloth, or a suspended filter cloth.
[0021] According to an advantageous aspect of the invention, the filter cloth used in a filter press is configured such that, during operation, two substantially identical filter cloths are used to cover two operating surfaces of a frame, and the edges of the filter cloths are fastened together by fastening elements on one edge and mating fastening elements on the other edge.
[0022] Several advantages are achieved through this invention and its advantageous features. First, securing the filter cloth(s) around the filter frame in place by hand is easy and quick, without the need for tools. Second, securing the filter cloth(s) around the filter frame in place can be achieved without any additional attachments (e.g., cable ties). Third, removing the used filter cloth(s) around the filter frame is easy and quick because the attachments can be easily opened by hand. Furthermore, since each fastening element and its mating element are made of filter cloth material, the recyclability of the filter cloth and attachment devices is improved. Moreover, there are no loose parts that could fall into the filtration process, thus greatly reducing the risk of damage to the filter press. Additionally, filter cloths with corresponding fasteners can be used for single filter cloths, double filter cloths, and suspended filter cloths. Attached Figure Description
[0023] However, various aspects of the invention and its additional objects and advantages will be best understood when read in conjunction with the accompanying drawings, based on the following description of some exemplary embodiments, and the invention will be described in more detail below with reference to the accompanying drawings, wherein,
[0024] Figure 1 schematically illustrates an example of a filter cloth known in the prior art.
[0025] Figure 2 An advantageous example of a filter cloth according to the invention is illustrated schematically.
[0026] Figures 3A-3G The diagram schematically illustrates an advantageous example of mounting a filter cloth according to the invention around a filter frame. Detailed Implementation
[0027] In the description based on different views illustrating the invention, the same numbers and symbols will be used to identify the same elements. For clarity, some repeated annotations of reference numerals may be omitted in the figures.
[0028] Figure 1 schematically illustrates an example of a filter cloth 10 known in the prior art. This example is a single-type filter cloth, i.e., two filter cloths 10 are used to cover a filter frame, one filter cloth on each operating surface of the filter frame. The edges 13, 14 of the filter cloth 10 are provided with protrusions 15 separated by recesses 16. The protrusions 15 have attachment holes 17. Furthermore, the bottom edges 12 of the filter cloth 10 may each have attachment holes 17. To attach the filter cloths, several plastic cable ties are thus passed through the attachment holes 17 of the filter cloth 10 on one operating surface of the filter frame, and then through the corresponding attachment holes 17 of the corresponding edges of the filter cloth on the other operating surface of the filter frame, and then fastened. The construction of the upper edges of (one or more) filter cloths 10 can be any construction known to those skilled in the art.
[0029] exist Figure 2 An advantageous example of filter cloth 10 is schematically shown in the diagram. Figures 3A-3G The diagram schematically illustrates an example of mounting the filter cloth 10 onto the filter frame 31.
[0030] The filter frame 31 has a plate-like form, and the operating surface is the wide side of the plate-like form (i.e., on opposite side surfaces of the filter frame 31), while the non-operating surface is the narrow side of the plate-like form (i.e., on opposite side surfaces of the filter frame 31). One or more filter cloths 10 cover the operating surface, and fasteners are located on one or more non-operating surfaces.
[0031] The filter cloth 10 includes side edges 13, 14 and a bottom edge 12. The side edges 13, 14 include spaced-apart protrusions 15. As illustrated in the example of the figures, the side edges 13, 14 may be straight or include recesses 16 located between the protrusions 15. The protrusions 15 advantageously have an inclined profile toward the adjacent recesses 16. A protrusion 15 on one side edge 14 has outwardly extending projections, each projection forming a fastening element 21, and a protrusion on the other side edge 13 has mating fastening elements 22 to which each fastening element 21 is attached for attaching one or more filter cloths 10, thereby covering the operating surface of the filter frame 31 across the non-operating surface of the filter frame. The protrusions 15 cause one or more filter cloths 10 to extend along the edge of the filter frame 31, forming a fastening distance on the non-operating surface of the filter frame 31 (i.e., the narrow side surface of the filter frame 31).
[0032] The filter cloth 10 can be a single filter cloth 10, in which case one filter cloth 10 covers one filter surface of the filter frame 31, and two filter cloths 10 are fastened to each other to cover the operating surface of the filter frame 31; it can be a double filter cloth 10, in which case the filter cloth 10 is folded around one side edge of the filter frame, and the side edges of the filter cloth 10 are fastened to each other to cover the operating surface of the filter frame 31; or it can be a hanging filter cloth 10, in which case the filter cloth 10 is folded down from the top edge of the filter frame, and the side edges of the filter cloth 10 are fastened to each other on each side of the filter frame.
[0033] The fastening element 21 at one side edge 14 and the mating fastening element 22 at the other side edge 13 are advantageously machined directly onto the filter cloth 10 by cutting. The fastening element 21 and the mating fastening element 22 are configured to interlock with each other (advantageously forming an attachment 20).
[0034] For the protrusion 15 of the bottom edge 12 of the filter cloth, one or more fastening elements 21 and mating fastening elements 22 are advantageously alternately provided, thereby also providing bottom edge fastening for single filter cloth, double filter cloth and hanging filter cloth 10.
[0035] Utilizing this design according to the invention, the filter cloth can be quickly fastened to or removed from the filter frame without any risk of damage. It is known that a certain degree of vibration exists in filtration systems; furthermore, the manual removal of the filter cake using special tools can sometimes lead to the risk of the filter cloth fasteners coming loose. Therefore, the present invention further attempts to improve the locking stability and reliability of the fastening system based on the foregoing. Based on this, the following advantageous design is implemented, combined with… Figures 2-3G Described in the context. This is a further technical problem addressed by the present invention, and is also a secondary inventive point. The technical effect of these further designs is to prevent the fastening system from separating, thereby further ensuring locking and keeping the fastening elements stable during filtration (even during vibration and motion).
[0036] exist Figures 2-3G In an advantageous example, the fastening element 21 has an interlocking shape, and in the example of the figures, the interlocking shape is formed as a T-shape machined on one edge 14 of the filter cloth 10 as a protrusion of the protrusion 15. The mating fastening element 22 has a cutout 29 (advantageously a straight cutout 29) machined on the protrusion 15 at a distance from the outer edge of the protrusion 15.
[0037] from Figure 3AAs can be seen, the interlocking shape (e.g., T-shaped or arrow-shaped) of the fastening element 21 has a rod portion 27 and two cutouts 28A, 28B located in the rod portion 27 (advantageously oppositely curved cutouts, such as semi-circular cutouts 28A, 28B) forming flaps that open in opposite directions. The fastening element 21 also has two arms 26A, 26B extending in opposite directions at the outer end of the rod portion 27. The fastening element 21 is located on one side of the filter frame 31, and the mating fastening element 22 is located on the other side of the filter frame 31.
[0038] To begin fastening (one or more) of the filter cloth 10, firstly, the protrusions 15 of the mating fastening elements 22 (i.e., the notches 29 and the protrusions 15) are folded against the non-operating surface of the filter frame 31, as shown. Figure 3B As shown.
[0039] The next step in fastening (one or more) filter cloths 10 is to fold the T-shaped arms 26A, 26B of the fastening element 21 against the T-shaped rod 27 of the fastening element 21, as shown. Figure 3C As shown. These fasteners can be specially treated, for example, with coatings or other surface treatments, to enhance their wear resistance and extend their service life.
[0040] To further secure the filter cloth(s) 10, the T-shaped rod 27 of the fastening element 21 is folded toward the cutout 29 (i.e., toward the mating fastening element 22) and toward the non-operating surface and the surface of the protrusion 15 of the filter frame 31, as shown. Figure 3D As shown.
[0041] In the next stage, such as Figure 3E As shown, the folded arms 26A, 26B and the rod 27 are pushed through the cut 29, so that the flap formed by the cut 28B closer to the base of the rod 27 is fastened to the outer edge of the protrusion 15 of the mating fastening element 22.
[0042] from Figure 3F As can be seen, the folds of arms 26A and 26B are opened to extend along the length of cut 29. A flap formed by another cut 28A is fastened to the edge of cut 29, such that the flaps formed by cuts 28A and 28B are cut portions facing each other on the protrusions 15 of the mating fastening elements 22, thereby providing attachments 20 for the fastening elements 21 and the mating fastening elements 22. Thus, the edges 13 and 14 of the filter cloth(s) 10 are fastened to each other on the non-operating surface of the filter frame 31, which can also be seen from... Figure 3G This can be seen from the text.
[0043] The length of the cut 29 of the mating fastening element 22 is equal to or greater than the width of the T-shaped rod 27 of the fastening element 21, such that the rod 27 fits through the cut 29. The width between the open ends of the T-shaped arms 26A, 26B of the fastening element 21 is greater than the width of the T-shaped rod 27 of the fastening element 21 and the length of the cut 29 of the mating fastening element 22. The distance between the bases (i.e., uncut portions) of the two flaps formed by the two cuts 28A, 28B is equal to or greater than the distance from the cut 29 to the outer edge of the protrusion 15 of the mating fastening element 22, thus providing a strong and tight fastening of the filter cloth(s).
[0044] In the foregoing description, although some functions have been described with reference to certain features, these functions may be performed by other features (whether or not they have been described). Although features have been described with reference to certain embodiments or examples, those features may also exist in other embodiments or examples (whether or not they have been described). The invention has been described above with reference to some advantageous examples, but the invention is not limited to these examples. Various modifications and variations are possible within the scope of the invention as defined in the following claims.
Claims
1. A filter cloth for a filter press, the filter press comprising a filter frame (31), one or more filter cloths (10) including side edges (13, 14) and a bottom edge (12), and said one or more filter cloths (10) being configured to cover the operating surface of said filter frame (31) and being configured to be attached at least at the side edges (13, 14) of said one or more filter cloths (10), characterized in that, The one or more filter cloths (10) have a fastening element (21) at at least one side edge (14) and a mating fastening element (22) at at least another side edge (13), the fastening element and the mating fastening element fastening each other and configured to form an attachment (20) of the one or more filter cloths (10) at the filter frame (31), and the fastening element (21) and the mating fastening element (22) are directly machined onto the one or more filter cloths.
2. The filter cloth according to claim 1, characterized in that, The fastening element (21) and the mating fastening element (22) are directly processed onto the one or more filter cloths (10) by cutting, stamping or any other similar means.
3. The filter cloth according to claim 1 or 2, characterized in that, The one or more filter cloths (10) have a fastening element (21) at one side edge (14) of the filter cloth (10) and a mating fastening element (22) at the other side edge (13) of the filter cloth (10).
4. The filter cloth according to claim 1 or 2, characterized in that, The one or more filter cloths (10) include alternating fastening elements (21) and mating fastening elements (22) at at least one edge of the one or more filter cloths (10).
5. The filter cloth according to any one of the preceding claims, characterized in that, The fastening element (21) and the mating fastening element (22) are configured to form an interlocking, advantageously openable attachment (20) between each other.
6. The filter cloth according to any one of the preceding claims, characterized in that, The bottom edge and side edges (12, 13, 14) of the one or more filter cloths (10) have spaced protrusions (15), and the fastening element (21) and the mating fastening element (22) are machined in connection with the protrusions (15).
7. The filter cloth according to any one of the preceding claims, characterized in that, The fastening element (21) has an interlocking shape, including a rod (27) and arms (26A, 26B).
8. The filter cloth according to claim 7, characterized in that, The fastening element (21) has two opposing cuts (28A, 28B) forming a wing in the rod (27).
9. The filter cloth according to any one of the preceding claims, characterized in that, The mating fastening element (22) has a cut (29), which is advantageously a straight cut.
10. The filter cloth according to claim 9, characterized in that, The length of the cut (29) of the mating fastening element (22) is equal to or greater than the width of the rod (27) of the fastening element (21).
11. The filter cloth according to any one of claims 7 to 10, characterized in that, The width between the open ends of the arms (26A, 26B) of the fastening element (21) is equal to or greater than the width of the rod (27) of the fastening element (21).
12. The filter cloth according to claims 9 to 11, characterized in that, The distance between the bases, i.e. uncut portions, of the two flaps formed by the two opposing cuts (28A, 28B) is equal to or greater than the distance between the cut (29) and the outer edge of the protrusion (15) of the mating fastening element (22).