A variable posture filter plate assembly for filter press

Abstract

The present application relates to filter press technical field, specifically to a kind of variable attitude filter plate assembly for filter press, including fixed plate, multiple filter plates and connecting unit, multiple the filter plate is arranged in the side of the fixed plate, each the filter plate is respectively through the connecting unit with the fixed plate movable connection, to make each the filter plate can be converted between vertical attitude and inclined attitude relative to the fixed plate;When the driving unit drives each the filter plate mutually away and forms second state, each the filter plate switches to inclined attitude, the spacing between adjacent filter plate increases, and the filter surface of each the filter plate is inclined relative to vertical direction, solved the existing filter press unloading cake because of the strong adhesion between mud cake and filter plate and lead to unloading cake not completely, need manual cleaning problem.

Description

Technical Field

[0001] This invention relates to the field of filter press technology, and more specifically to a variable posture filter plate assembly for a filter press. Background Technology

[0002] With the deepening of national ecological and environmental protection plans and policies on reducing construction waste, the green disposal and resource utilization of engineering mud has become a focus of industry attention. Traditional mud disposal methods mostly involve natural drying or off-site landfilling, which not only occupies a large amount of land but also easily causes water and soil pollution and resource waste. To achieve the green construction goal of "zero emissions and full recycling," the filter press, as a key piece of equipment for mud dewatering and volume reduction, is crucial for efficient and stable operation. However, in traditional filter presses, the opening method of the filter plates usually relies solely on a mechanical plate pulling mechanism to separate adjacent filter plates. Although this simple linear pulling structure can achieve basic cake unloading, the mud cake often cannot completely detach itself under the single action of gravity in actual production due to the strong adhesion between the mud cake and the filter plate (or the filter cloth covering the filter plate). The high-pressure filtration applied during the filtration process causes the mud cake to be densely pressed onto the surface of the filter plate. Combined with the surface tension generated by the sticky components of the soil itself or the residual moisture, this creates an adhesion force far greater than the weight of the mud cake, resulting in the "cake hanging" phenomenon. The direct consequence of incomplete cake removal is that residual cake will clog the feed channel for the next cycle, preventing the filter chambers of the filter press from filling properly. This leads to a significant decrease in filtration efficiency and artificially lengthens the filtration cycle. To address this issue, on-site operators often need to frequently use tools such as shovels and high-pressure water guns for manual cleaning. This not only increases the labor intensity of the operators but also prolongs the auxiliary time between two filtrations, forcing the interruption of the originally continuous filter press process. This is especially true for sludge dewatering or slurry filtration scenarios with large throughput and high concentration, where the frequency of manual intervention is extremely high. This severely restricts the automation level and processing capacity per unit time of the production line. In addition, frequent manual cleaning may damage the surface of the filter press plates, shorten the service life of vulnerable parts, and increase maintenance costs.

[0003] Therefore, the inventors have proposed a variable posture filter plate assembly for a filter press to solve the above-mentioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide a variable posture filter plate assembly for a filter press, so as to solve the problem that the cake is not completely discharged and requires manual cleaning due to the strong adhesion between the cake and the filter plate during the discharge of the existing filter press.

[0005] On the one hand, in order to achieve the above objectives, the technical solution adopted by the present invention is as follows: A variable-position filter plate assembly for a filter press includes a fixed plate, a plurality of filter plates, and a connecting unit. The plurality of filter plates are disposed on one side of the fixed plate, and each filter plate is movably connected to the fixed plate through the connecting unit, so that each filter plate can switch between a vertical posture and an inclined posture relative to the fixed plate. A driving unit is connected to one of the filter press plates and is used to drive the filter press plates to move closer to or further away from each other along their arrangement direction. When the driving unit drives each of the filter plates to approach each other to form a first state, each of the filter plates switches to a vertical posture and the filter surface of each of the filter plates is at the maximum effective filtration area. When the driving unit drives each of the filter plates to move away from each other to form a second state, each of the filter plates switches to an inclined posture, the distance between adjacent filter plates increases, and the filter surface of each filter plate is inclined relative to the vertical direction.

[0006] Furthermore, the connecting unit includes multiple cross frames and cross rods, the cross frames are hinged to the cross rods, each cross frame is mounted on a corresponding filter press plate, and adjacent cross frames are hinged to each other; The crossbar includes a first connecting rod and a second connecting rod, wherein the first end of the first connecting rod and the first end of the second connecting rod are hinged together at the same hinge point on the fixed plate; The cross frame includes a third connecting rod and a fourth connecting rod, which are arranged in a cross configuration. The cross position of the third connecting rod and the fourth connecting rod is hinged to the corresponding filter plate. The second end of the first connecting rod is hinged to the first end of the third connecting rod, and the second end of the second connecting rod is hinged to the first end of the fourth connecting rod. The second end of the third connecting rod is hinged to the first end of the fourth connecting rod on the adjacent cross frame, and the second end of the fourth connecting rod is hinged to the first end of the third connecting rod on the adjacent cross frame.

[0007] Furthermore, the filter press includes a sliding table, a first filter plate, and a second filter plate. An mounting plate is fixedly installed on the sliding table. One end of the mounting plate is hinged to the first filter plate, and the other end of the mounting plate is hinged to the second filter plate. The first filter plate and the second filter plate are arranged parallel to each other.

[0008] Furthermore, a first rod and several parallel second rods are provided between the first filter plate and the second filter plate. A connecting post is provided at the middle position of the mounting plate. The connecting post is hinged to the first rod. One end of the second rod is hinged to the first filter plate, and the other end of the second rod is hinged to the second filter plate. The intersection of the third connecting rod and the fourth connecting rod is hinged to the connecting post.

[0009] Furthermore, it also includes a drive rod, one end of which is hinged to the second end of the second connecting rod, and the other end of which is hinged to one of the second rod bodies.

[0010] Furthermore, the first filter plate and the second filter plate have the same structure; The first filter plate includes a plurality of filter plate bodies, which are hinged to each other, wherein the filter plate body located at the end face is hinged to the mounting plate.

[0011] Furthermore, the filter plate body includes a first plate body and a second plate body, wherein a pressure chamber is formed in the first plate body, and the second plate body is slidably connected in a sealed manner within the pressure chamber; The first plate has several exhaust holes, which are connected to the air pressure chamber. Each exhaust hole is provided with a first one-way valve diaphragm. The first plate has an air inlet that communicates with the air pressure chamber, and a second one-way valve diaphragm is provided at the air inlet.

[0012] Furthermore, it also includes an air intake pipe, which is connected to several branch air pipes, each of which is connected to a corresponding air intake port.

[0013] Furthermore, a filter chamber is formed between adjacent filter plates, and a number of filter holes are opened on the second plate. A filter channel is formed between the first filter plate and the second filter plate.

[0014] Furthermore, it also includes a connecting plate, one end of which is hinged to the first filter plate, and the other end of which is hinged to the second filter plate.

[0015] The beneficial effects of this invention are: This invention uses a connecting unit to simultaneously convert the motion of the drive unit into changes in the posture of the filter press plate and dynamic adjustment of the filtration area. During the cake unloading process, the filter press plate automatically switches to an inclined posture and the effective area of ​​the filtration surface is significantly reduced, which greatly reduces the adhesion strength between the cake and the filtration surface. This allows the cake to fall off on its own under the action of the tangential component of gravity, without the need for manual scraping or high-pressure water gun assistance. This significantly improves the thoroughness of cake unloading and the level of automation, shortens the filtration cycle, and enhances the continuous operation capability of the filter press.

[0016] This invention designs the filter plate body as a pneumatic chamber structure with a sliding fit between the first and second plates. During cake removal, the filter plate retracts, compressing the pneumatic chamber to generate high-pressure gas that is ejected from the exhaust port. Simultaneously, the second plate slides inward to mechanically scrape off the cake. This achieves the synergistic effect of a triple cake removal mechanism: tilting and gravity sliding, mechanical scraping, and high-pressure air blowing. Furthermore, the compression and repositioning of the pneumatic chamber rely entirely on the motion power provided by the drive unit, eliminating the need for additional pneumatic control components. The structure is highly integrated and cost-effective, effectively solving the industry problem of high-viscosity mud cakes being difficult to remove.

[0017] When the filter press plate switches from a vertical to an inclined position, the gravity of the filter cake is decomposed into a parallel downward tangential component along the filter surface. This tangential component increases with the increase of the inclination angle, forming an effective sliding driving force together with the weight of the filter cake. Simultaneously, the inclination of the filter press plate creates an angle between the filter surface and the horizontal direction, partially releasing the normal compressive force between the filter cake and the filter surface in the original vertical state. This causes shear stress concentration at the adhesion interface of the filter cake, making it easier to peel off from the edges. Furthermore, in this solution, the inclination of the filter press plate and the shrinkage of the filter area occur simultaneously. The reduction in the effective area of ​​the filter surface further reduces the adhesion strength of the filter cake, allowing the tangential component to overcome the residual adhesion force and propel the entire filter cake smoothly down the inclined filter surface. This completely solves the problem in traditional filter presses where the filter cake cannot detach itself due to adhesion force exceeding its own weight.

[0018] Other advantages, objectives, and features of this application will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from practice of this application. The objectives and other advantages of this application may be realized and obtained through the detailed embodiments described below. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a pressure filter structure in the prior art; Figure 2 This is a side view of the variable posture filter plate assembly for the filter press of the present invention in the first state; Figure 3 for Figure 2 A schematic diagram of a partial structure; Figure 4 This is a side view of the variable posture filter plate assembly for the filter press of the present invention in the second state; Figure 5 This is a schematic diagram of the first direction of the variable posture filter plate assembly for the filter press of the present invention when it is in the first state; Figure 6 This is a schematic diagram of the second direction of the variable posture filter plate assembly for the filter press of the present invention when it is in the first state; Figure 7 This is a schematic diagram of the overall structure of the filter plate body in the variable posture filter plate assembly for filter press of the present invention; Figure 8 This is a cross-sectional schematic diagram of the filter plate body in the variable posture filter plate assembly for filter press of the present invention; Figure 9 for Figure 5 A schematic diagram of the cross-sectional structure; Figure 10 for Figure 9 A magnified structural diagram of part A.

[0020] The components include: a fixed plate 1, a filter press plate 2, a sliding table 21, a first filter plate 22, a second filter plate 23, a mounting plate 24, a first rod 25, a second rod 26, a connecting column 27, a connecting unit 3, a cross frame 31, a third connecting rod 311, a fourth connecting rod 312, a cross rod 32, a first connecting rod 321, a second connecting rod 322, a drive rod 4, a filter plate body 5, a first plate body 51, a second plate body 52, a pressure chamber 53, an exhaust port 54, an air inlet port 55, an air inlet pipe 56, a branch air pipe 57, a filter hole 58, a filter channel 59, a connecting plate 591, and a sliding plate 6. Detailed Implementation

[0021] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0022] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0023] Existing technologies such as Figure 1The diagram shows an existing filter press structure, including a fixed plate 1, a connecting unit 3, and several sliding plates 6. The fixed plate 1 is fixedly mounted on the frame of the filter press. The sliding plates 6 are connected sequentially via the connecting unit 3 and can move horizontally. During operation, a drive device (such as a hydraulic cylinder) pushes the sliding plates 6 closer together and presses them together through the connecting unit 3, forming a filtration chamber between adjacent sliding plates 6. The concentrated slurry is injected into the filtration chamber under high pressure, and water is discharged through the sliding plates 6. The solid particles of the slurry gradually deposit to form a cake. After filtration, the drive device pulls the outermost sliding plate 6 in the opposite direction, and the connecting unit 3 causes all the sliding plates 6 to separate sequentially, increasing the distance between adjacent sliding plates 6. The cake falls off by gravity. However, due to the high filtration pressure during the filter press process, the cake is densely compacted onto the surface of the sliding plates 6. Combined with the adhesive force generated by the viscous components in the slurry and the surface tension of the residual water, the adhesion between the cake and the sliding plates 6 (or the covering filter cloth) is much greater than the weight of the cake itself, causing the cake to fail to fall off on its own, resulting in cake adhesion. In actual production, operators must frequently use shovels or high-pressure water guns to manually clean each sliding plate 6. This is not only labor-intensive and time-consuming, but frequent scraping can also damage the surface of the sliding plate 6, shortening the equipment's lifespan. Furthermore, residual sludge cake can clog the feed channel for the next cycle, significantly reducing filtration efficiency and forcing a longer filtration cycle, severely restricting the automation level and continuous operation capability of the filter press. Therefore, the existing filter press structure, which relies solely on simple linear separation and gravity-fed cake discharge, cannot meet the demands for efficient, automated, and clean cake discharge in high-viscosity, high-moisture sludge treatment scenarios.

[0024] This embodiment proposes a variable-position filter plate assembly for a filter press, such as... Figures 2 to 10 As shown, the system includes a fixed plate 1, multiple filter plates 2, and a connecting unit 3. The multiple filter plates 2 are disposed to the right of the fixed plate 1, and each filter plate 2 is movably connected to the fixed plate 1 via the connecting unit 3, allowing each filter plate 2 to switch between a vertical and inclined posture relative to the fixed plate 1. The fixed plate 1 is fixedly mounted on the filter press. In this embodiment, there are three filter plates 2. It is understood that the number of filter plates 2 is not limited to three in this embodiment; it can be four, five, or more, depending on the requirements of the filter press. A driving unit is connected to one of the filter plates 2 and is used to drive each filter plate 2 to move closer or further away from each other along its arrangement direction. In this embodiment, the driving unit is preferably a hydraulic cylinder, which is mounted on the filter press. The piston rod of the hydraulic cylinder is connected to the rightmost filter plate 2. When the driving unit drives each filter plate 2 to move closer to each other to form a first state (corresponding to...), the filter press is in a more stable state. Figure 2 As shown), each filter press plate 2 switches to a vertical position, and the filter surface of each filter press plate 2 is at its maximum effective filtration area; when the drive unit drives each filter press plate 2 to move away from each other to form a second state (corresponding to...), Figure 4 As shown), each filter press plate 2 switches to an inclined posture, the distance between adjacent filter press plates 2 increases, and the filter surface of each filter press plate 2 is inclined relative to the vertical direction. At the same time, the filter area of ​​the filter press plate 2 decreases, and the first state and the second state can be switched between each other.

[0025] In the initial state, the piston rod of the hydraulic cylinder extends, driving each filter plate 2 to move to the left and approach each other, entering the first state. At this time, each filter plate 2 is switched to a vertical posture by the guidance and constraint of the connecting unit 3. The filter surface of each filter plate 2 is fully expanded to the maximum effective filter area, thereby meeting the filter area requirements of high-pressure filtration. When filtration is completed and the mud cake attached to the filter surface needs to be removed, the drive unit drives each filter plate 2 to move away from each other and enter the second state in the opposite direction to the right. During this process, the connecting unit 3 drives each filter plate 2 to switch to an inclined posture in sync, so that the filter surface forms a certain angle relative to the vertical direction. At the same time, the distance between adjacent filter plates 2 increases. More importantly, the filter surface of each filter plate 2 shrinks from the maximum area to a smaller area. This reduction in area directly reduces the contact area and adhesion strength between the mud cake and the filter surface. Unlike existing filter presses that rely solely on the sliding plate 6 to separate the filter cake by its own weight, often resulting in cake residue buildup due to excessive adhesion, this invention achieves a synergistic effect of multiple cake removal mechanisms by linking the movement of the filter plates 2 away from each other with their tilting posture and the shrinkage of the filtration area. This eliminates the need for manual scraping or high-pressure water gun assistance, improving the thoroughness and automation of cake removal. After cake removal, the drive unit again moves the filter plates 2 closer together, and the filter plates 2 automatically return to their vertical posture and the filtration surface expands back to its maximum area, ready for the next filtration cycle.

[0026] In a preferred embodiment, the connecting unit 3 includes multiple cross frames 31 and cross rods 32. The cross frames 31 and cross rods 32 are hinged together. Each cross frame 31 is mounted on a corresponding filter press plate 2, and adjacent cross frames 31 are hinged together. The cross rod 32 includes a first connecting rod 321 and a second connecting rod 322. The first end of the first connecting rod 321 and the first end of the second connecting rod 322 are hinged together at the same hinge point on the fixing plate 1. The cross frame 31 includes a third connecting rod 311 and a fourth connecting rod 312. The third connecting rod 311 and the first connecting rod 322 are hinged together at the same hinge point on the fixing plate 1. The cross frame 31 includes a third connecting rod 311 and a fourth connecting rod 312. The third connecting rod 311 and the first connecting rod 322 are hinged together at the same hinge point on the fixing plate 1. The four connecting rods 312 are arranged in a cross configuration, and the intersection of the third connecting rod 311 and the fourth connecting rod 312 is hinged to the corresponding filter plate 2. The second end of the first connecting rod 321 is hinged to the first end of the third connecting rod 311, and the second end of the second connecting rod 322 is hinged to the first end of the fourth connecting rod 312. The second end of the third connecting rod 311 is hinged to the first end of the fourth connecting rod 312 on the adjacent cross frame 31, and the second end of the fourth connecting rod 312 is hinged to the first end of the third connecting rod 311 on the adjacent cross frame 31.

[0027] The connecting unit 3 adopts a scissor-type connecting unit 3 to realize the synchronous movement and attitude transformation of each filter press plate 2. Specifically, the fixed plate 1 is provided with a hinge point, where the first end of the first connecting rod 321 and the first end of the second connecting rod 322 in the cross rod 32 are hinged together; the second end of the first connecting rod 321 is hinged to the first end of the third connecting rod 311 in the cross frame 31 on the first filter press plate 2, and the first end of the second connecting rod 322 is hinged to the first end of the fourth connecting rod 312 in the same cross frame 31. Each filter press plate 2 is equipped with a cross frame 31, which is formed by a third connecting rod 311 and a fourth connecting rod 312, and is hinged to the filter press plate 2 at the intersection. The cross frames 31 of adjacent filter press plates 2 are hinged to each other. The second end of the third connecting rod 311 of the previous cross frame 31 is hinged to the first end of the fourth connecting rod 312 of the next cross frame 31, and the second end of the fourth connecting rod 312 of the previous cross frame 31 is hinged to the first end of the third connecting rod 311 of the next cross frame 31. When the drive unit drives the outermost filter press plate 2 away from the fixed plate 1, the first connecting rod 321 and the second connecting rod 322 rotate outward around the common hinge point on the fixed plate 1, respectively pushing the third and fourth connecting rods 312 of the first cross frame 31 to open. Then, through the hinge relationship between adjacent cross frames 31, the movement is transmitted step by step, so that all filter press plates 2 move away from each other synchronously and equidistantly.

[0028] In a preferred embodiment, the filter press 2 includes a sliding table 21, a first filter plate 22, and a second filter plate 23. A mounting plate 24 is fixedly installed on the sliding table 21. One end of the mounting plate 24 is hinged to the first filter plate 22, and the other end of the mounting plate 24 is hinged to the second filter plate 23. The first filter plate 22 and the second filter plate 23 are arranged in parallel. A first rod 25 and several parallel second rods 26 are arranged between the first filter plate 22 and the second filter plate 23. A connecting post 27 is provided at the middle position of the mounting plate 24. The connecting post 27 is fixedly installed on the mounting plate 24 and is hinged to the first rod 25. One end of the second rod 26 is hinged to the first filter plate 22, and the other end of the second rod 26 is hinged to the second filter plate 23. The first rod 25 and the second rod 26 are arranged in parallel. The intersection of the third connecting rod 311 and the fourth connecting rod 312 is hinged to the connecting post 27.

[0029] In this embodiment, the filter press 2 consists of a sliding table 21, a first filter plate 22, and a second filter plate 23. A mounting plate 24 is fixedly installed on the sliding table 21. One end of the mounting plate 24 is hinged to the first filter plate 22, and the other end is hinged to the second filter plate 23. The first filter plate 22 and the second filter plate 23 are always arranged in parallel. To achieve synchronization between the first filter plate 22 and the second filter plate 23, a first rod 25 and several parallel second rods 26 are provided between them. A connecting post 27 is provided in the middle of the mounting plate 24. This connecting post 27 is hinged to the first rod 25 and also hinged to the intersection of the aforementioned third connecting rod 311 and fourth connecting rod 312, thereby transmitting the movement of the cross frame 31 to the filter press 2 and achieving the deformation of the filter press 2.

[0030] In one possible implementation, the connecting column 27 is configured to be slidably mounted on the mounting plate 24. In the scheme where the connecting column 27 is fixedly mounted on the mounting plate 24, the tolerances of the positions of all hinge points may accumulate, which may cause additional bending moments when the cross frame 31 moves, but will not interfere. After the connecting column 27 is slidably mounted, its position can be automatically adjusted within a certain range (e.g., sliding along the longitudinal direction of the mounting plate 24) to compensate for the length errors of each member, the deviation of the hinge hole positions, and the straightness errors of the guide rail of the sliding table 21, making the movement of the entire scissor lift mechanism smoother, reducing the risk of jamming and abnormal noise, and improving reliability.

[0031] In a preferred embodiment, a drive rod 4 is also included. One end of the drive rod 4 is hinged to the second end of the second connecting rod 322, and the other end of the drive rod 4 is hinged to one of the second rod bodies 26. Further, the first filter plate 22 and the second filter plate 23 have the same structure; the first filter plate 22 includes a plurality of filter plate bodies 5, adjacent filter plate bodies 5 are interconnected, wherein the filter plate body 5 located at the end face is hinged to the mounting plate 24.

[0032] In this embodiment, when the drive unit drives each filter plate 2 to switch from the first state to the second state, the second connecting rod 322 rotates around its hinge point with the fixed plate 1, and its second end drives the drive rod 4 to move. The drive rod 4 then pushes the second rod body 26, which is hinged to it, to rotate around the hinge point, thereby actively pulling the first filter plate 22 and the second filter plate 23 to retract. In order to further reduce the area of ​​the filter surface during the retraction process and adapt to the cake unloading requirements under the inclined posture, the first filter plate 22 and the second filter plate 23 adopt the same segmented structure. Each filter plate is composed of several filter plate bodies 5 connected in sequence. Adjacent filter plate bodies 5 can rotate relative to each other, and the filter plate body 5 located at the end face is hinged to the mounting plate 24. When the second rod body 26 rotates and drives the first filter plate 22 and the second filter plate 23 to retract inward, the whole rotates around the hinge point of the mounting plate 24 from the vertical state to the inclined state.

[0033] Furthermore, the filter plate body 5 includes a first plate body 51 and a second plate body 52. ​​The first plate body 51 has a pressure chamber 53, and the second plate body 52 is slidably connected to the pressure chamber 53. The first plate body 51 has a plurality of exhaust holes 54, which are connected to the pressure chamber 53. Each exhaust hole 54 is provided with a first one-way valve diaphragm. The first plate body 51 has an air inlet hole 55, which is connected to the pressure chamber 53. A second one-way valve diaphragm is provided at the air inlet hole 55. The filter plate body 56 also includes an air inlet pipe 56, which is connected to a plurality of branch air pipes 57. Each branch air pipe 57 is connected to a corresponding air inlet hole 55. The air inlet pipe 56 is connected to a high-pressure air source.

[0034] In this embodiment, a pressure chamber 53 is formed between the first plate 51 and the second plate 52 constituting the filter plate body 5. The second plate 52 is slidably connected to the pressure chamber 53, and a filter hole 58 is provided on the second plate 52 for filtering water in the slurry. The first plate 51 is provided with exhaust holes 54 that communicate with the pressure chamber 53. Each exhaust hole 54 is provided with a first one-way valve membrane (which only allows gas to be discharged from the pressure chamber 53 to the outside). The first plate 51 is also provided with an air inlet hole 55 with a second one-way valve membrane (which only allows gas to enter the pressure chamber 53 from the outside). All air inlets 55 are connected to the air inlet pipe 56 through a branch air pipe 57. When transitioning from the second state to the first state, the first one-way valve diaphragm closes, the second one-way valve diaphragm opens, and the volume of the pressure chamber 53 gradually increases. External high-pressure gas enters each pressure chamber 53 through the inlet pipe 56, branch pipe 57, inlet hole 55, and the second one-way valve diaphragm, pushing the second plate 52 to slide outward relative to the first plate 51, so that the filter surface is fully expanded to the maximum effective filtration area. At the same time, the pressure chamber 53 is filled with high-pressure gas. When the filtration is completed and the drive unit drives each filter plate 2 to transition from the first state to the second state, the drive rod 4, through the second rod 26, causes the first filter plate 22 and the second filter plate 23 to retract, and the second plate 52 slides into the first plate 51. As the filter press gradually slides into the air pressure chamber 53 of the first plate 51, it compresses the gas inside. Due to the second one-way valve membrane preventing gas backflow, the compressed high-pressure gas can only be ejected outward through the exhaust port 54 via the first one-way valve membrane. These exhaust ports 54 are located on the side of the first plate 51 (i.e., the area where the filter surface contacts the filter cake). The high-speed airflow directly impacts the interface between the filter cake and the filter surface, generating an air cushion peeling effect. At the same time, as the second plate 52 slides inward, its edges scrape off the filter cake adhering to the filter surface. Combined with the overall tilting posture of the filter press 2 and the shrinkage of the filter area, these factors together constitute a triple cake unloading mechanism of tilting self-weight sliding, mechanical scraping, and high-pressure air blowing. Conversely, when the drive unit drives each filter plate 2 to reset from the second state to the first state, the drive rod 4 moves in the opposite direction, and the filter plate body 5 re-unfolds under the drive of the parallelogram mechanism. Without the need for additional power, due to the increased volume of the air pressure chamber 53, the external high-pressure gas can spontaneously re-enter the air pressure chamber 53 through the air inlet pipe 56, branch air pipe 57, and air inlet hole 55, pushing the second plate body 52 to slide outward, restoring the filter surface to its maximum area, and preparing for the next cycle of filtration. By directly linking the sliding compression action of the second plate body 52 with the retraction action of the drive unit, connecting unit 3, and segmented filter plate body 5, this solution can automatically generate gas impact and mechanical scraping at the moment of cake discharge without additional power or separate control commands. It achieves a high degree of integration of structure, motion, and air path, and significantly improves the thoroughness of cake discharge and the level of automation compared with existing filter presses that rely solely on gravity or passive air blowing.

[0035] In a preferred embodiment, a filter chamber is formed between adjacent filter plates 2, and a plurality of filter holes 58 are provided on the second plate 52. A filter channel 59 is formed between the first filter plate 22 and the second filter plate 23. A connecting plate 591 is also included, one end of which is hinged to the first filter plate 22, and the other end of which is hinged to the second filter plate 23.

[0036] In this embodiment, after the filter press structure is installed on the filter press, a filter chamber is formed between adjacent filter plates 2. The concentrated slurry enters each filter chamber through the feed inlet. Under the action of the filter press pressure, the water in the slurry passes through the multiple filter holes 58 opened on the second plate 52 in sequence and enters the filter channel 59 between the first filter plate 22 and the second filter plate 23. Finally, it is discharged from the end of the filter channel 59 (e.g., the two ends of the frame on the filter press). The solid particles in the slurry are trapped on the filter surfaces of the first plate 51 and the second plate 52, gradually forming a dense slurry cake, which adheres to the filter surfaces of the first filter plate 22 and the second filter plate 23 (i.e., the outer surfaces of the first plate 51 and the second plate 52 of each filter plate body 5). In order to form a closed and structurally stable filtration channel 59, in addition to using an mounting plate 24 to connect one end of the first filter plate 22 and the second filter plate 23, this solution also adds a connecting plate 591. One end of the connecting plate 591 is hinged to the first filter plate 22 and the other end is hinged to the second filter plate 23. The mounting plate 24 and the connecting plate 591 are located on both sides of the filter plate, and together with the first filter plate 22 and the second filter plate 23, they form a frame-type closed filtration channel 59, ensuring that the filtered water can flow smoothly out from both ends of the frame without leaking to the outside of the filtration chamber. When the filter press is complete and cake unloading is required, the drive unit drives each filter press plate 2 to switch from the first state to the second state: First, the drive rod 4 drives the first filter plate 22 and the second filter plate 23 to retract inward through the second rod body 26, reducing the filtration area; Second, the second plate body 52 is pushed into the air pressure chamber 53 of the first plate body 51, compressing the gas in the chamber. The high-pressure gas is ejected through the exhaust holes 54 on both sides of the first plate body 51, directly impacting the interface between the mud cake and the filter surface, forming an air cushion peeling; At the same time, when the second plate body 52 slides into the first plate body 51, the mud cake adhering to the second plate body 52 is detached from the second plate body 52 and scraped off.

[0037] In this embodiment, when the driving unit drives each filter plate 2 to switch from the first state to the second state, the scissor-type connecting unit 3 in the connecting unit 3 synchronously drives the filter plate 2 to tilt as a whole, so that the filter surface forms a certain tilt angle relative to the vertical direction. At the same time, the driving rod 4 and the second rod 26 force the first filter plate 22 and the second filter plate 23 to tilt and retract, so that the effective area of ​​the filter surface is reduced, thereby significantly reducing the contact area and adhesion strength between the mud cake and the filter surface. Based on this, the retraction action also forces the second plate 52 to slide inward along the air pressure chamber 53. On the one hand, it uses its edge to mechanically scrape off the adhering mud cake, and on the other hand, it compresses the high-pressure gas in the air pressure chamber 53, causing the gas to be ejected at high speed through the exhaust hole 54 arranged on the side of the first plate 51, directly impacting the interface between the mud cake and the filter surface, forming an air cushion peeling effect. The reduced adhesion caused by the decrease in filter area, the mechanical scraping of the sliding scraper, and the impact purging of high-pressure gas all work simultaneously and superimpose under the same driving action, so that even high-viscosity, high-moisture mud cakes can be easily and completely removed. After the unloading is completed, the drive unit moves in the opposite direction, the filter plate 2 automatically returns to its vertical position, the filter surface is re-expanded to the maximum area, and the air pressure chamber 53 automatically draws air from the external high-pressure air source to recharge due to the increase in volume, preparing for the next cycle. Apart from the drive unit, the entire process requires no additional control commands or auxiliary power. The structure is highly integrated and the operation is reliable. Compared with the existing filter presses that rely solely on linear pulling and the cake falling off by its own weight, the cake unloading of this invention is more thorough, and the filtration cycle is shortened. This increases the processing capacity of the filter press per unit time, while reducing manual intervention, lowering the labor intensity and maintenance costs of operators, and extending the service life of filter plates and filter cloth. This invention achieves efficient, automatic, and clean operation in high-viscosity slurry dewatering scenarios and has high application value.

[0038] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A variable-position filter plate assembly for a filter press, characterized in that, include: The assembly includes a fixed plate (1), multiple filter plates (2), and a connecting unit (3). The multiple filter plates (2) are disposed on one side of the fixed plate (1). Each filter plate (2) is movably connected to the fixed plate (1) through the connecting unit (3) so that each filter plate (2) can switch between a vertical posture and an inclined posture relative to the fixed plate (1). A driving unit is connected to one of the filter press plates (2) for driving each of the filter press plates (2) to move closer to or further away from each other along their arrangement direction; When the driving unit drives each of the filter plates (2) to approach each other to form a first state, each of the filter plates (2) switches to a vertical posture and the filter surface of each of the filter plates (2) is at the maximum effective filter area. When the driving unit drives each of the filter plates (2) to move away from each other to form a second state, each of the filter plates (2) switches to an inclined posture, the distance between adjacent filter plates (2) increases, and the filter surface of each filter plate (2) is inclined relative to the vertical direction.

2. The variable posture filter plate assembly for a filter press according to claim 1, characterized in that: The connecting unit (3) includes multiple cross frames (31) and cross rods (32). The cross frames (31) are hinged to the cross rods (32). Each cross frame (31) is installed on a corresponding filter press plate (2). Adjacent cross frames (31) are hinged to each other. The cross rod (32) includes a first connecting rod (321) and a second connecting rod (322), wherein the first end of the first connecting rod (321) and the first end of the second connecting rod (322) are hinged together at the same hinge point on the fixed plate (1); The cross frame (31) includes a third connecting rod (311) and a fourth connecting rod (312). The third connecting rod (311) and the fourth connecting rod (312) are arranged in a cross configuration, and the cross position of the third connecting rod (311) and the fourth connecting rod (312) is hinged to the corresponding filter plate (2). The second end of the first connecting rod (321) is hinged to the first end of the third connecting rod (311), and the second end of the second connecting rod (322) is hinged to the first end of the fourth connecting rod (312). The second end of the third connecting rod (311) is hinged to the first end of the fourth connecting rod (312) on the adjacent cross frame (31), and the second end of the fourth connecting rod (312) is hinged to the first end of the third connecting rod (311) on the adjacent cross frame (31).

3. The variable posture filter plate assembly for a filter press according to claim 2, characterized in that: The filter press (2) includes a sliding table (21), a first filter plate (22) and a second filter plate (23). An mounting plate (24) is fixedly installed on the sliding table (21). One end of the mounting plate (24) is hinged to the first filter plate (22), and the other end of the mounting plate (24) is hinged to the second filter plate (23). The first filter plate (22) and the second filter plate (23) are arranged in parallel.

4. The variable posture filter plate assembly for a filter press according to claim 3, characterized in that: A first rod (25) and several parallel second rods (26) are provided between the first filter plate (22) and the second filter plate (23). A connecting post (27) is provided at the middle position of the mounting plate (24). The connecting post (27) is hinged to the first rod (25). One end of the second rod (26) is hinged to the first filter plate (22), and the other end of the second rod (26) is hinged to the second filter plate (23). The intersection of the third connecting rod (311) and the fourth connecting rod (312) is hinged to the connecting post (27).

5. The variable posture filter plate assembly for a filter press according to claim 4, characterized in that: It also includes a drive rod (4), one end of which is hinged to the second end of the second connecting rod (322), and the other end of which is hinged to one of the second rod bodies (26).

6. The variable posture filter plate assembly for a filter press according to claim 5, characterized in that: The first filter plate (22) and the second filter plate (23) have the same structure; The first filter plate (22) includes a plurality of filter plate bodies (5), and adjacent filter plate bodies (5) are hinged to each other, wherein the filter plate body (5) located at the end face is hinged to the mounting plate (24).

7. The variable posture filter plate assembly for a filter press according to claim 6, characterized in that: The filter plate body (5) includes a first plate body (51) and a second plate body (52). The first plate body (51) has an air pressure chamber (53) inside, and the second plate body (52) is slidably connected to the air pressure chamber (53). The first plate (51) is provided with a plurality of exhaust holes (54), the exhaust holes (54) are connected to the air pressure chamber (53), and each exhaust hole (54) is provided with a first one-way valve diaphragm; The first plate (51) has an air inlet (55) that communicates with the air pressure chamber (53), and the air inlet (55) is provided with a second one-way valve diaphragm that only allows gas to enter the air pressure chamber (53).

8. The variable posture filter plate assembly for a filter press according to claim 7, characterized in that: It also includes an air intake pipe (56), which is connected to a number of branch air pipes (57), each of which is connected to a corresponding air intake hole (55).

9. The variable posture filter plate assembly for a filter press according to claim 8, characterized in that: A filter chamber is formed between adjacent filter plates (2), and a plurality of filter holes (58) are provided on the second plate (52). A filter channel (59) is formed between the first filter plate (22) and the second filter plate (23).

10. The variable posture filter plate assembly for a filter press according to claim 9, characterized in that: It also includes a connecting plate (591), one end of which is hinged to the first filter plate (22), and the other end of which is hinged to the second filter plate (23).

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