Filter press assembly and filter press

Abstract

The utility model relates to solid -liquid separation production technical field especially, relate to a kind of filter pressing assembly and filter press.The filter pressing assembly includes rigid drainage plate, filter water spare and elastic sealing element, wherein: the thickness direction of rigid drainage plate is provided with filter water spare in at least one side;Filter water spare at least one side opening;Elastic sealing element is set on the surface of rigid drainage plate close to filter water spare, it is used to compress the opening side of filter water spare to form closed filter chamber, filter water spare is provided with the inlet of communicating filter chamber.The filter pressing assembly and filter press include following advantages: the size of filter chamber is not fixed, can reduce the influence of abnormal feeding on the life of complete machine;Each filter chamber is separately fed, improve the consistency of moisture content and thickness of filter cake;Under the condition of equivalent squeezing capacity, the weight and volume of complete machine are greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of solid-liquid separation technology, and in particular to a filter press assembly and a filter press. Background Technology

[0002] As a core piece of equipment for industrial solid-liquid separation, the filter press works on a pressure-driven solid-liquid separation mechanism, achieving efficient filtration through the synergistic effect of mechanical structure and fluid dynamics.

[0003] Conventional filter presses have the following disadvantages:

[0004] Firstly, some filter presses (such as diaphragm filter presses) add secondary filtration structures such as diaphragms to reduce the moisture content of the filter cake. However, the secondary filtration structure increases the complexity of the equipment and wastes the efficiency of the hydraulic cylinder. Moreover, the pressure generated by the diaphragm and the thrust of the hydraulic cylinder are mutually antagonistic. If the diaphragm pressure is greater than the hydraulic cylinder pressure, the seal will fail, leading to material leakage. If the hydraulic cylinder pressure is greater than the diaphragm pressure, the filter plate will bear greater pressure, which can easily damage the filter plate.

[0005] Secondly, conventional filter presses use a feed pipe that sequentially runs through all filter chambers. During the feeding process, the suspension enters each filter chamber sequentially through the feed pipe, causing the filter chambers that receive feed first to reach the filtration stage first, while the filter chambers that receive feed later will reach the filtration stage relatively later. This results in uneven coal cake formation in each filter chamber during the feeding stage, making it impossible to guarantee the consistency of the feed. During the filtration stage, the different feeding effects in each filter chamber lead to further differences, ultimately resulting in poor consistency in the moisture content and thickness of the produced filter cake.

[0006] Thirdly, to ensure stable operation and prevent material leakage, the raised structures around the filter plates bear extremely high pressure, making them highly susceptible to damage. This is especially true for diaphragm filter presses, where the raised structures of the filter plates, along with the coal cake, bear the pressure of the diaphragm. Abnormal feeding can lead to insufficient coal cake formation within the filter chamber, resulting in very low pressure-bearing capacity. Consequently, during the pressing stage, the pressure on the filter plates increases, easily causing damage. Furthermore, during production, the filter cloth is squeezed and rubbed by the rigid filter plates at the sealed areas of the filter chamber, affecting its lifespan. Utility Model Content

[0007] The first objective of this utility model is to provide a filter press assembly to solve the technical problems existing in the prior art, such as the increased complexity of the equipment due to the addition of a secondary filter press structure, poor consistency of the moisture content and thickness of the filter cake, and easy damage to the filter plate and filter cloth.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A filter press assembly includes a rigid drainage plate, a filter element, and a flexible sealing element, wherein:

[0010] The filter element is provided on at least one side of the rigid drainage board in the thickness direction;

[0011] The filter element has an opening on at least one side;

[0012] The elastic sealing element is disposed on the surface of the rigid drainage plate close to the filter element, and is used to press the open side of the filter element to form a closed filter chamber. The filter element is provided with an inlet that communicates with the filter chamber.

[0013] Furthermore, the filter element includes two layers of filter cloth, with the filter chamber formed between the two layers of filter cloth; at least one side of the two layers of filter cloth is open, so that at least one side of the filter chamber is open.

[0014] Furthermore, in the water filter element, one side of the two layers of filter cloth are connected and the remaining sides are open;

[0015] And / or, the two layers of filter cloth in the filter element are formed by folding a single piece of cloth in half;

[0016] And / or, the upper edges of the two layers of filter cloth in the filter element are connected;

[0017] And / or, at least one edge of the two layers of filter cloth in the filter element is connected, and the feed inlet is located at the connection position of the two layers of filter cloth.

[0018] Furthermore, the filter cloth is provided with a lifting lug above it, and the water filter element is suspended on the rigid drainage plate through the lifting lug;

[0019] And / or, the adjacent rigid drainage board and the filter cloth are connected.

[0020] Furthermore, a flexible drainage plate is provided on at least one side of the rigid drainage plate in the thickness direction, and the filter element is provided between the rigid drainage plate and the flexible drainage plate.

[0021] Furthermore, the surface of the flexible drainage board close to the filter element is covered with a filter screen;

[0022] And / or, the flexible drainage board includes a main plate and a frame plate surrounding the periphery of the main plate, a drainage groove is formed between the main plate and the frame plate, and the flexible drainage board is provided with slots that connect the inner and outer sides of the drainage groove.

[0023] And / or, adjacent flexible drainage boards and filter cloths are connected;

[0024] And / or, the rigid drainage board and the flexible drainage board are connected by one of a chain, rope, or connecting rod.

[0025] Furthermore, the elastic sealing member is U-shaped and faces the opening side of the water filter member;

[0026] And / or, the resilient sealing element is fixed to the bottom and both sides of the rigid drainage board and is flush with the edge of the rigid drainage board;

[0027] And / or, the elastic sealing component is assembled from several elastic bodies, with an expansion joint reserved between two adjacent elastic bodies.

[0028] Furthermore, the number of the water filter elements is multiple, and / or the water filter elements are provided with multiple feed inlets;

[0029] The filter press assembly also includes a water distributor disposed on the rigid drainage plate. The water distributor has an inlet and multiple outlets. The inlet of the water distributor is used to input slurry, and the multiple outlets of the water distributor are respectively connected to multiple feed ports.

[0030] Furthermore, the surface of the rigid drainage plate adjacent to the water filter element is covered with a filter screen.

[0031] The second objective of this utility model is to provide a filter press, which includes multiple sets of filter press components as described in any of the above claims, the multiple sets of filter press components are arranged side by side, and one or more of the water filter elements are arranged between two adjacent rigid drainage plates.

[0032] The beneficial effects of this utility model are:

[0033] This utility model provides a filter press assembly and a filter press. The filter press assembly includes a rigid drainage plate, a filter element, and an elastic sealing element. The filter element is provided on at least one side of the rigid drainage plate in the thickness direction. The filter element has an opening on at least one side. The elastic sealing element is provided on the surface of the rigid drainage plate close to the filter element and is used to press the opening side of the filter element to form a closed filter chamber. The filter element has an inlet that communicates with the filter chamber. The filter press assembly and filter press provided in this application have the following advantages: 1. The size of the filter chamber is not fixed. In the face of abnormal feeding or individual filter chambers not being filled, adjacent filter chambers can complement each other to a certain extent, reducing the impact of abnormal feeding on the overall lifespan of the machine; 2. Each filter chamber is fed separately during the feeding stage, which improves the consistency during the feeding stage, thereby improving the consistency of the moisture content and thickness of the filter cake; 3. The filter elements are relatively relaxed in terms of stress, which can improve the lifespan of the filter elements to a certain extent; 4. Compared with filter presses with secondary filtration structures, the equipment structure is simpler, the cost is lower, and it is not easily damaged; 5. Under the same pressing capacity, the number of filter plates is reduced, thereby significantly reducing the overall size of the machine. Attached Figure Description

[0034] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 A three-dimensional schematic diagram of the filter press assembly provided in this embodiment of the present invention;

[0036] Figure 2 A three-dimensional schematic diagram of the filter press assembly after the flexible drainage plate has been removed, provided in this embodiment of the utility model;

[0037] Figure 3 A three-dimensional schematic diagram of the water filter element provided in this embodiment of the utility model;

[0038] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0039] Figure 5 for Figure 2 A 3D schematic diagram after the filter components have been removed;

[0040] Figure 6 A schematic diagram illustrating the assembly and disassembly of the rigid drainage board and filter screen provided in this embodiment of the utility model;

[0041] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0042] Figure 8 A three-dimensional schematic diagram of the flexible drainage board provided in this embodiment of the present invention;

[0043] Figure 9 A front view of the filter press provided in this embodiment of the present invention;

[0044] Figure 10 for Figure 9 Enlarged view of point A in the middle.

[0045] icon:

[0046] 1-Filter press assembly; 11-Rigid drainage plate; 12-Filter element; 121-Filter cloth; 122-Inlet; 123-Lifting lug; 124-Adhesive tape; 13-Elastic sealing element; 14-Water distributor; 15-Filter screen; 16-Hanging rod; 17-Flexible drainage plate; 171-Main plate; 172-Frame plate;

[0047] 2-Frame; 21-Thrust plate; 22-Cylinder seat; 23-Main beam;

[0048] 3-Pressure plate drive source;

[0049] 4-Pressure plate. Detailed Implementation

[0050] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0051] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] It should be noted that in the description of this utility model, the terms "connection" and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through an intermediate medium; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] Taking a traditional chamber filter press as an example, its core process consists of the following steps: First, the hydraulic system pushes the clamping plate to press each filter plate onto the thrust plate, thus achieving the closure of the filter plates. Because the filter plate structure is convex around the edges and concave in the middle, filter chambers are formed between adjacent filter plates after closure, and filter cloth is laid between adjacent filter plates as a filtration barrier. Then, the feeding system is started, and the suspension is injected into the filter chamber through a high-pressure pump. A feed port is reserved in the middle of each filter plate. After closure, the feed port at the thrust plate is connected to the reserved feed ports of each filter plate in sequence to form a complete feed pipeline. The suspension enters each filter chamber in sequence along the feed pipeline. During the feeding process, the liquid passes through the pores of the filter cloth and is discharged from the equipment, while solid particles accumulate layer by layer on the filter cloth to form a filter cake. Finally, the filter plates are pulled apart by a pull plate trolley for unloading, completing one work cycle. A diaphragm filter press is based on a chamber filter press, but with the addition of a diaphragm between the filter plates and the filter cloth. The filter cake is then pressed a second time through the diaphragm, further reducing its moisture content.

[0054] Conventional filter presses have the following disadvantages: 1. The filter cake produced by traditional chamber filter presses has a high moisture content. Adding secondary filtration structures such as diaphragms increases the complexity of the equipment. At the same time, the pressure generated by the diaphragm is difficult to control. Too high or too low pressure will damage the performance of the filter press and affect the life of the whole machine. 2. Since the slurry enters each filter chamber sequentially through the feed pipe, the slurry volume in each filter chamber is inconsistent, resulting in poor consistency in the moisture content and thickness of the filter cake. 3. Filter plates and filter cloths are easily damaged.

[0055] In view of the above problems, one embodiment of this application provides a filter press assembly 1, referring to... Figures 1 to 3 The filter press assembly 1 includes a rigid drainage plate 11, a filter element 12, and an elastic sealing element 13, wherein:

[0056] A filter element 12 is provided on at least one side of the rigid drainage board 11 in the thickness direction;

[0057] The filter element 12 has an opening on at least one side;

[0058] The elastic sealing member 13 is disposed on the surface of the rigid drainage plate 11 close to the filter element 12. It is used to press the open side of the filter element 12 to form a closed filter chamber. The filter element 12 is provided with an inlet 122 that communicates with the filter chamber.

[0059] It should be noted that the shape of the filter chamber is not fixed; in the projection along the thickness direction of the rigid drainage plate 11, the filter chamber can be a regular shape such as a triangle, rectangle, trapezoid, or circle, or it can be an irregular shape; in this embodiment, the filter chamber is rectangular in the projection along the thickness direction of the rigid drainage plate 11. Furthermore, the filter chamber can be open on one side, two sides, three sides, or all sides; the filter chamber only needs to have at least one opening to allow unloading through the opening side of the filter chamber after filtration. The shape of the elastic sealing member 13 is adaptively adjusted according to the opening state of the filter chamber; in the projection along the thickness direction of the rigid drainage plate 11, the elastic sealing member 13 coincides with the opening edge of the filter element 12.

[0060] It should also be noted that a number of filter elements 12 may be provided on only one side of the rigid drainage plate 11 in the thickness direction, or a number of filter elements 12 may be provided on both sides of the rigid drainage plate 11 in the thickness direction. The above-mentioned "a number" refers to one, two or more.

[0061] Another embodiment of this application provides a filter press, referring to... Figure 9 and Figure 10 The filter press includes multiple sets of the above-mentioned filter press components 1, which are arranged side by side, and one or more water filter elements 12 are provided between two adjacent rigid drainage plates 11.

[0062] Compared to conventional filter plates and filter presses, the filter press assembly 1 and filter press provided in this application have the following advantages:

[0063] 1. The filter chamber is no longer formed by joining filter plates, but by the filter element 12 itself. Since the filter element 12 is made of flexible material, when two or more filter elements 12 are arranged between two adjacent rigid drainage plates 11 in the filter press, even if the spacing of the rigid drainage plates 11 is fixed, the size of the filter chamber is not fixed. In this way, in the face of abnormal feeding or individual filter chambers that cannot be filled, the adjacent filter chambers can supplement each other to a certain extent, reducing the impact of abnormal feeding and uneven feeding thickness caused by inconsistent pressure in each feed pipeline on the life of the whole machine.

[0064] 2. Each filter element 12 is provided with an inlet 122 that connects to the filter chamber. In this way, each filter chamber is fed separately during the feeding stage, and the feeding time is basically the same. The feeding is completed at the same time and enters the filtration stage, which improves the consistency during the feeding stage, and thus improves the consistency of the moisture content and thickness of the filter cake.

[0065] 3. The opening side of the filter chamber is pressed and closed by the elastic sealing element 13 on the rigid drainage plate 11. Compared with being directly pressed by rigid metal, the filter element 12 is relatively relaxed in terms of force, which can improve the service life of the filter element 12 to a certain extent. At the same time, the elastic sealing element 13 realizes the balance of force and control of distance between the rigid drainage plates 11. The thickness of the filter chamber is also affected by the size of the elastic sealing element 13. This means that when it is necessary to change the thickness of the filter chamber at the time of feeding, only the thickness of the elastic sealing element 13 needs to be adjusted, without replacing the entire filter plate (the filter plate here can be regarded as a combination of the rigid drainage plate 11 and the elastic sealing element 13).

[0066] 4. Since the two adjacent rigid drainage plates 11 are separated by the filter element 12 and the elastic sealing element 13, the filter cake in the filter chamber can be further pressed by the elastic sealing element 13. Compared with the chamber filter press, the moisture content of the filter cake is lower. Compared with the filter press with a secondary filtration structure (such as the diaphragm filter press), most of the pressure is applied to the filter cake, and the rigid drainage plate 11 bears less pressure, which makes the equipment structure longer, simpler and cheaper.

[0067] 5. Each filter element 12 can form a filter chamber independently, so one, two or more filter chambers can be arranged on both sides of the rigid drainage plate 11. Under the same pressing capacity, the number of filter plates is reduced, thereby significantly reducing the weight and volume of the whole machine.

[0068] Furthermore, referring to Figure 3 The filter element 12 includes two layers of filter cloth 121, with at least one edge of each layer open, forming a filter chamber between them. The filter cloth 121 is made of a material with high tensile strength and is sewn with a thread of comparable strength, allowing the filter cloth 121 to absorb the pressure generated during the feeding and filtration processes. Optionally, the filter cloth 121 can be in the shape of a regular shape such as a triangle, rectangle, trapezoid, or circle, or it can be an irregular shape. Taking the shape of the filter cloth 121 as a rectangle as an example, when one side of the two layers of filter cloth 121 is open and the other three sides are sewn together, one side of the filter chamber is open, and the elastic sealing member 13 is straight; when both sides of the two layers of filter cloth 121 are open and the other two sides are sewn together, both sides of the filter chamber are open, and the elastic sealing member 13 is L-shaped or two parallel straight strips; when one side of the two layers of filter cloth 121 is sewn together and the other three sides are open, three sides of the filter chamber are open, and the elastic sealing member 13 is U-shaped; when all four sides of the two layers of filter cloth 121 are open, each side of the filter chamber is open, and the elastic sealing member 13 is square.

[0069] In some embodiments, the two layers of filter cloth 121 in the filter element 12 are connected on one side and open on the other side. In each filter element 12, since the two layers of filter cloth 121 have a connected side, the two layers of filter cloth 121 are not prone to misalignment, ensuring the stability of the filter chamber shape. During the unloading stage, the elastic sealing member 13 releases the pressure on the open side of the two layers of filter cloth 121, so that one side of the filter chamber is closed and the other sides are open. Each open surface of the filter chamber forms an unloading channel, which facilitates the filter cake to fall from the filter chamber.

[0070] In some embodiments, the two layers of filter cloth 121 in the water filter element 12 are formed by folding a single piece of fabric in half. For example... Figure 3 As shown, in this embodiment, the two layers of filter cloth 121 are formed by folding a rectangular piece of fabric along its long side, making the processing technology simpler. Of course, the two layers of filter cloth 121 can also be connected by sewing, gluing, or other methods.

[0071] In some embodiments, the upper edges of the two layers of filter cloth 121 in the filter element 12 are joined together. In this embodiment, the filter element 12 is rectangular, with the top of the filter chamber formed inside the filter element 12 closed and the other three sides open. During the filter press operation, the rigid drainage plates 11 are pushed together by the hydraulic system, and the three open surfaces of the filter chamber are clamped and sealed by the U-shaped elastic sealing member 13. The top fold of the two layers of filter cloth 121 is self-sealed, thus forming a sealed filter chamber inside the filter element 12. After the filter press is completed, the rigid drainage plates 11 are pulled apart. At this time, the elastic sealing member 13 releases the pressure on the filter chamber, and the three open surfaces of the filter chamber form a discharge channel to facilitate the removal of the filter cake.

[0072] In some embodiments, the feed inlet 122 is located at the junction of the two filter cloth layers 121. In this embodiment, two feed inlets 122 are provided at the fold at the top of the two filter cloth layers 121, through which slurry is injected into the closed filter chamber. In other embodiments, the feed inlet 122 may also be located on the upper side of any one of the filter cloth layers 121; furthermore, the number of feed inlets 122 may be one, three, or more.

[0073] Furthermore, the water filter element 12 is installed on the rigid drainage plate 11.

[0074] In some embodiments, refer to Figure 3 and Figure 4 The filter cloth 121 is provided with a lifting lug 123 above it, and the rigid drainage plate 11 is provided with a hanging rod 16 for hanging by the lifting lug 123. The water filter element 12 is suspended on the rigid drainage plate 11 through the lifting lug 123. One, two, or more water filter elements 12 can be suspended on each side of the rigid drainage plate 11 along the thickness direction.

[0075] In some embodiments, adjacent rigid drainage boards 11 and filter cloths 121 are connected by connectors. For example... Figure 3 As shown, the connector can be an adhesive tape 124 (e.g., Velcro) or an adhesive strip, which is attached to the surface of the filter cloth 121 close to the rigid drain plate 11 to bond adjacent rigid drain plates 11 and filter cloth 121 together, preventing the filter cloth 121 from shifting during use. Alternatively, the connector can be a strap or a screw, and adjacent rigid drain plates 11 and filter cloth 121 can also be connected by straps or screws.

[0076] Reference Figure 5 and Figure 6 In embodiments where the filter chamber is rectangular and open on three sides, the elastic sealing member 13 is U-shaped and faces the open sides of the filter chamber. Furthermore, the rigid drainage plate 11 is entirely flat, and the elastic sealing member 13 is fixed to the bottom and both sides of the rigid drainage plate 11, flush with the edges of the rigid drainage plate 11, thus maximizing the utilization of the filtration area of ​​the rigid drainage plate 11. The elastic sealing member 13 can be fixed to the rigid drainage plate 11 by embedding connections or fasteners such as screws; for example... Figure 7 As shown, in this embodiment, the filter press surfaces on both sides of the rigid drainage plate 11 are respectively fixed by dovetail grooves and elastic sealing members 13.

[0077] In some embodiments, the elastic sealing element 13 is assembled from several elastic bodies, with an expansion joint reserved between adjacent elastic bodies. For example... Figure 6 As shown, multiple elastomers are assembled end-to-end to form a segmented structure, with expansion joints of a certain distance reserved between the segments. During the pre-compression and pressing stages, the elastomers deform and elongate under pressure, causing the expansion joints to close and achieve a sealing effect. The purpose of setting the expansion joints is twofold: firstly, to reduce the overall deformation resistance of the elastic sealing component 13, thereby reducing the energy consumption of the filter press; secondly, to increase the overall deformation of the elastic sealing component 13, increase the compression ratio limit, and reduce the minimum distance between two adjacent rigid drainage plates 11, thereby reducing the moisture content of the filter cake. In addition, the assembled elastic sealing component 13 also ensures convenient replacement; depending on the degree of aging, selective replacement of certain parts of the elastic sealing component 13 is possible.

[0078] Continue to refer to Figure 6The filter press assembly 1 includes multiple filter elements 12, or each filter element 12 has multiple inlets 122. The filter press assembly 1 also includes a distributor 14 disposed on a rigid drainage plate 11. The distributor 14 has one inlet and multiple outlets. The inlet of the distributor 14 is connected to a branch pipe, and the multiple outlets of the distributor 14 are respectively connected to the multiple inlets 122. The multiple outlets of the distributor 14 can be respectively connected to the multiple inlets 122 of the same filter element 12, or they can be respectively connected to the inlets 122 of different filter elements 12. In this embodiment, two one-outlet-two-outlet distributors 14 are fixedly disposed on the top of each rigid drainage plate 11. Each distributor 14 and the top of the rigid drainage plate 11 are each provided with a hanging rod 16. The filter elements 12 are respectively suspended on both sides of the rigid drainage plate 11 by the hanging rods 16. To ensure overall force balance in the filter element 12, each of the two layers of filter cloth 121 is provided with a lifting lug 123 at its upper end. In the filter press assembly 1, the number of lifting lugs 123 and hanging rods 16 are the same and they correspond one-to-one. The lifting lugs 123 are hung on the corresponding hanging rods 16, and the two are fixed to the rigid drainage plate 11 or the water distributor 14 by fasteners. In the above arrangement, the two layers of filter cloth 121 are independently suspended on the rigid drainage plate 11.

[0079] In some embodiments, the filter elements 12 are disposed on the left and right sides of the rigid drainage plate 11. Each filter element 12 is symmetrically provided with two inlets 122. The two outlets of a water distributor 14 are respectively connected to the inlets 122 on the left and right sides of the rigid drainage plate 11. The feed of each filter element 12 comes from different branch pipes. If a branch pipe is blocked, the feed inlet on the other side can compensate for the feed, ensuring the consistency of the total amount of material in each filter element 12.

[0080] In some embodiments, the surface of the rigid drainage plate 11 adjacent to the filter element 12 is covered with a filter screen 15. In this embodiment, grooves for drainage are machined on the filter pressing surfaces (i.e., the surfaces adjacent to the filter element 12) on both sides of the rigid drainage plate 11, and a filter screen 15 made of woven metal wire is installed between the filter pressing surfaces of the rigid drainage plate 11 and the filter cloth 121. The function of the filter screen 15 is to form a pore channel between the rigid drainage plate 11 and the filter cloth 121, which facilitates the rapid discharge of filtered liquid. Conventional filter plates form pore channels between the filter plate and the filter cloth by machining an array of protrusions on the filter pressing surface, while this application uses a filter screen 15 to form pore channels for drainage, which not only reduces processing costs, but also allows the filter screen 15 to be disassembled and replaced, solving the problem that conventional filter plates can only be replaced as a whole after the protrusions are severely worn.

[0081] In some embodiments, a flexible drainage plate 17 is provided on at least one side of the rigid drainage plate 11 in the thickness direction, and a filter element 12 is provided between the rigid drainage plate 11 and the flexible drainage plate 17.

[0082] Reference Figure 1 In this embodiment, a filter element 12 is suspended on each side of the rigid drainage plate 11. A flexible drainage plate 17 is provided on the side of one of the filter elements 12 away from the rigid drainage plate 11. In this way, when multiple sets of filter press components 1 are installed side by side on the frame 2 of the filter press, two filter elements 12 are provided between two adjacent rigid drainage plates 11, and a layer of flexible drainage plate 17 is provided between the two filter elements 12.

[0083] In other embodiments, there are multiple filter elements 12 located on the same side of the rigid drainage plate 11, and a flexible drainage plate 17 is provided between two adjacent filter elements 12 on the same side.

[0084] In the filter press provided in this application, a rigid drainage plate 11 or a flexible drainage plate 17 is provided between two adjacent filter elements 12. That is, a drainage plate is provided between each pair of adjacent filter chambers. The water in the slurry in the filter chamber can be discharged through the rigid and flexible drainage plates. Thus, while increasing the number of filter chambers between two adjacent rigid drainage plates 11, the normal drainage of each filter chamber will not be affected.

[0085] It should be noted that during the filter press process, the rigid drainage plate 11 mainly functions as applying pressure, sealing the filter chamber, and draining water, while the flexible drainage plate 17 mainly functions as draining water. That is, the flexible drainage plate 17 does not undertake the functions of applying pressure and sealing the filter chamber. Its thickness is generally less than that of the rigid drainage plate 11, and its flexible nature also determines that it is lighter in weight. In addition, it is usually not equipped with an elastic sealing element 13 on top. Therefore, the impact of setting the flexible drainage plate 17 on the weight and length of the whole machine is negligible. Of course, an elastic sealing element 13 can also be provided on the surface of the flexible drainage plate 17 close to the filter element 12. During the feeding process, the elastic sealing elements 13 on the adjacent flexible drainage plates 17 and the elastic sealing elements 13 on the rigid drainage plates 11 together clamp the opening side of the filter element 12 between them, thereby jointly controlling the thickness of the filter chamber during feeding. When there are two or more flexible drainage plates 17 between two rigid drainage plates 11, during the feeding process, the elastic sealing elements 13 on the two adjacent flexible drainage plates 17 together clamp the opening side of the filter element 12 between them. Alternatively, only one elastic sealing element 13 can be provided between two adjacent flexible drainage plates 17.

[0086] Reference Figure 9 and Figure 10In some embodiments, adjacent rigid drainage plates 11 and flexible drainage plates 17 are connected by a chain, rope, or connecting rod. In the filter press, the drainage plates (including rigid drainage plates 11 and flexible drainage plates 17) are connected in series by a long chain, and the length of the chain segment between adjacent drainage plates is fixed. During unloading, each time a rigid drainage plate 11 is moved, the next rigid drainage plate 11 to be unloaded is pulled away by a suitable distance through the fixed-length chain segment between that rigid drainage plate 11, the flexible drainage plate 17, and the next rigid drainage plate 11.

[0087] In some embodiments, adjacent flexible drainage plates 17 and filter cloth 121 are connected by connectors. The connectors can be one or more fasteners such as adhesive tape 124, rubber strips, binding tape, and screws, and their connection method is the same as that described above for the connectors between the rigid drainage plate 11 and filter cloth 121. This arrangement, on the one hand, prevents the filter cloth 121 from shifting during use, thereby ensuring the stability of the filter chamber shape; on the other hand, since the two layers of filter cloth 121 in the filter element 12 are respectively connected to the rigid drainage plate 11 and the flexible drainage plate 17, when the filtration is completed and the drainage plates are pulled apart, the two layers of filter cloth 121 will be pulled apart at a certain angle, thereby breaking the adhesion between the filter cloth 121 and the filter cake, making unloading easier.

[0088] Reference Figure 8 The surface of the flexible drainage plate 17 adjacent to the filter element 12 is covered with a filter screen 15. Similarly, as described above, the surface of the flexible drainage plate 17 adjacent to the filter element 12 is machined with grooves that open to the outside and are used for drainage. The filter screen 15 can form a porous channel for drainage between the flexible drainage plate 17 and the filter cloth 121, so that the water in the slurry in the filter chamber is discharged to the outside in sequence through the pores of the filter cloth 121, the filter screen 15, and the drainage grooves.

[0089] In this embodiment, the flexible drainage board 17 includes a main plate 171 and a frame plate 172 surrounding the main plate 171. A drainage groove is formed between the main plate 171 and the frame plate 172. The flexible drainage board 17 is provided with slots connecting the inner and outer sides of the drainage groove. The flexible drainage board 17 is manufactured by stacking the main plate 171 and the frame plates 172 on both sides of the main plate 171. The frame plates 172 are stacked on both sides of the main plate 171 to form a drainage groove, and a filter screen 15 is installed in the drainage groove on both sides. The flexible drainage board 17 is made of an elastic material such as polyurethane. This material can withstand large bending without plastic deformation. Therefore, when the feed thickness of the filter chambers on both sides of the flexible drainage board 17 is inconsistent, a pressure difference will be generated between the two adjacent filter chambers. The flexible drainage board 17 will eliminate the pressure difference through elastic deformation, so that the flexible drainage board 17 will not be damaged.

[0090] Reference Figure 9 and Figure 10 The filter press provided in this application also includes a frame 2, a pressure plate drive source 3, and a pressure plate 4. The frame 2 includes a thrust plate 21, a cylinder seat 22, and a main beam 23. The thrust plate 21, cylinder seat 22, and main beam 23 combine to form a supporting main frame. The pressure plate drive source 3 (generally a cylinder) is mounted on the cylinder seat 22, and the pressure plate 4 is mounted on the power output end of the pressure plate drive source 3. Each filter press assembly 1 is arranged side-by-side between the thrust plate 21 and the pressure plate 4. Each drainage plate (including a rigid drainage plate 11 and a flexible drainage plate 17) is connected in series by an iron chain, with one end of the chain fixed to the pressure plate 4, forming a series structure of pressure plate 4-rigid drainage plate 11-flexible drainage plate 17. This series structure uses a fixed-length iron chain segment to sequentially connect the pressure plate 4-rigid drainage plate 11-flexible drainage plate 17, thus ensuring a constant distance between each filter press assembly 1 when the plates are opened.

[0091] The filter press principle of the above filter press is as follows: During filtration, the pressure plate drive source 3 pushes the pressure plate 4 to apply pressure to each rigid drainage plate 11. The pressure is transmitted between multiple rigid drainage plates 11, thereby achieving the effect of filter pressing between the filter chambers of the rigid drainage plates 11. Since a flexible drainage plate 17 is arranged between two adjacent rigid drainage plates 11, the flexible drainage plate 17 is in contact with the adjacent filter element 12, which is conducive to the precipitation of water from the slurry in the filter element 12.

[0092] The unloading principle of the above-mentioned filter press is as follows: After the filter press is completed, the pressing plate 4 is retracted with the oil cylinder. Due to the connection of the iron chain, the pressing plate 4 will pull the first rigid drainage plate 11 and the subsequent flexible drainage plate 17 and the second rigid drainage plate 11 apart by a certain distance. At this time, the two layers of filter cloth 121 between the two adjacent drainage plates are pulled apart by a certain angle, thereby destroying the adhesion between the filter cloth 121 and the filter cake, so that the filter cake can easily fall off under the action of gravity. After the unloading is completed, the first rigid drainage plate 11 is dragged by the plate pulling trolley to move a certain distance towards the pressing plate 4. At this time, under the action of the iron chain, the second rigid drainage plate 11 and the subsequent flexible drainage plate 17 and the third rigid drainage plate 11 will be pulled apart by a certain distance. The plate pulling trolley is run repeatedly until the last rigid drainage plate 11 is unloaded.

[0093] In summary, the filter press assembly 1 and the filter press including the filter press assembly 1 provided in this embodiment have the following advantages:

[0094] 1. Each filter element 12 forms its own independent filter chamber. The filter element 12 is suspended between two adjacent rigid drainage plates 11, and the number of them can be adjusted according to the usage requirements. Each filter chamber is provided with a separate inlet 122. Each filter chamber is fed separately during the feeding stage, which improves the consistency of filter cake formation during the production process.

[0095] 2. The elastic sealing element 13 on the rigid drainage plate 11 applies a sealing force to the filter chamber, and the connecting edge of the two layers of filter cloth 121 in the water filter element 12 seals itself, which reduces the sealing difficulty of the filter chamber.

[0096] 3. The elastic sealing element 13 has a segmented structure with expansion joints reserved between the segments, which can improve the service life of the elastic sealing element 13, reduce the resistance of the elastic sealing element 13, increase the compression limit of the elastic sealing element 13 and increase the compression ratio, thereby reducing the moisture content of the filter cake.

[0097] 4. Each rigid drainage plate 11 can suspend at least two filter elements 12. At the same time, a flexible drainage plate 17 that facilitates drainage is placed between two adjacent rigid drainage plates 11. This reduces the number of rigid drainage plates 11 without changing the number of filter chambers, thereby reducing the weight and length of the whole machine.

[0098] 5. The flexible drainage board 17 has high flexibility and good drainage effect. It can play a role in adjusting the pressure difference of the filter chamber and extending the service life when the feed is inconsistent.

[0099] 6. As the plate-pulling trolley pulls apart the adjacent rigid drainage plate 11 and flexible drainage plate 17, the two layers of filter cloth 121 between the two drainage plates are also pulled apart at a certain angle, thereby breaking the adhesion between the filter cloth 121 and the filter cake, making unloading easier.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A filter press assembly, characterized in that, It includes a rigid drainage board (11), a water filter element (12), and a flexible sealing element (13), wherein: The rigid drainage board (11) has the filter element (12) provided on at least one side in the thickness direction; The filter element (12) has an opening on at least one side; The elastic sealing member (13) is disposed on the surface of the rigid drainage plate (11) close to the filter element (12), and is used to press the open side of the filter element (12) to form a closed filter chamber. The filter element (12) is provided with an inlet (122) communicating with the filter chamber.

2. The filter press assembly according to claim 1, characterized in that, The filter element (12) includes two layers of filter cloth (121), and the filter chamber is formed between the two layers of filter cloth (121); at least one side of the two layers of filter cloth (121) is open so that at least one side of the filter chamber is open.

3. The filter press assembly according to claim 2, characterized in that, The two layers of filter cloth (121) in the filter element (12) are connected on one side and open on the other side; And / or, the two layers of filter cloth (121) in the filter element (12) are formed by folding a single piece of cloth in half; And / or, the upper edges of the two layers of filter cloth (121) in the filter element (12) are connected; And / or, at least one edge of the two layers of filter cloth (121) in the filter element (12) is connected, and the feed inlet (122) is located at the connection position of the two layers of filter cloth (121).

4. The filter press assembly according to claim 2, characterized in that, The filter cloth (121) is provided with a lifting lug (123) above it, and the water filter element (12) is suspended on the rigid drainage plate (11) through the lifting lug (123); And / or, the adjacent rigid drainage plate (11) and the filter cloth (121) are connected.

5. The filter press assembly according to claim 2, characterized in that, A flexible drainage plate (17) is provided on at least one side of the rigid drainage plate (11) in the thickness direction, and the filter element (12) is provided between the rigid drainage plate (11) and the flexible drainage plate (17).

6. The filter press assembly according to claim 5, characterized in that, The surface of the flexible drainage board (17) close to the filter element (12) is covered with a filter screen (15); And / or, the flexible drainage board (17) includes a main plate (171) and a side plate (172) surrounding the periphery of the main plate (171), and a drainage groove is formed between the main plate (171) and the side plate (172), and the flexible drainage board (17) is provided with slots that connect the inner and outer sides of the drainage groove. And / or, adjacent flexible drainage boards (17) and filter cloths (121) are connected; And / or, the rigid drainage board (11) and the flexible drainage board (17) are connected by one of a chain, rope, or link.

7. The filter press assembly according to claim 1, characterized in that, The elastic sealing element (13) is U-shaped and faces the opening side of the filter element (12); And / or, the resilient sealing element (13) is fixed to the bottom and sides of the rigid drainage plate (11) and flush with the edge of the rigid drainage plate (11); And / or, the elastic sealing element (13) is assembled from several elastic bodies, and an expansion joint is reserved between two adjacent elastic bodies.

8. The filter press assembly according to claim 1, characterized in that, The number of the water filter element (12) is multiple, and / or the water filter element (12) is provided with multiple feed inlets (122); The filter press assembly also includes a distributor (14) disposed on the rigid drainage plate (11), the distributor (14) having an inlet and multiple outlets, the inlet of the distributor (14) being used to input slurry, and the multiple outlets of the distributor being respectively connected to multiple feed inlets (122).

9. The filter press assembly according to claim 1, characterized in that, The surface of the rigid drainage plate (11) close to the filter element (12) is covered with a filter screen (15).

10. A filter press, characterized in that, It includes multiple sets of filter press components as described in any one of claims 1 to 9, the multiple sets of filter press components are arranged side by side, and one or more of the water filter elements (12) are provided between two adjacent rigid drainage plates (11).

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