Filter unit, filter press and method for purging the feed channel

Abstract

The application provides a filter unit, a filter press and a blow-sweeping method of a pulp inlet channel, and relates to the field of solid-liquid separation.The filter unit comprises a filter unit main body, a thrust plate, a movable pressing plate and a plurality of filter plates which are matched with the filter press; two material guide pipes; a pulp inlet pipe which is connected to one of the material guide pipes; a blow-sweeping assembly which comprises a blowing pipe, a pulp discharge pipe, a first gate valve, and a second gate valve and a third gate valve which are respectively arranged on the blowing pipe and the pulp discharge pipe.The filter unit can blow and sweep the back-shaped guide channel in a directional manner by using compressed air without disassembling the filter plates and interrupting the pressing state, so that residual pulp liquid can be removed.In addition, the application also provides a filter press which comprises the filter unit and a rack assembly, a hydraulic pressing mechanism, a filter liquid discharge mechanism, an automatic plate pulling and discharging mechanism, a pipeline auxiliary mechanism and an electrical control mechanism.The filter press can effectively avoid channel deposition and blockage, improve the blow-drying efficiency and reduce the manual cleaning intensity without disassembling the filter plates.

Description

Technical Field

[0001] This invention relates to the field of solid-liquid separation technology, and more specifically, to a filtration unit, a filter press, and a purging method for the slurry inlet channel. Background Technology

[0002] Filter presses, as typical pressure filtration equipment, are one of the mainstream models in the field of solid-liquid separation. They use pressure as the driving force, causing solid particles in the suspension to be trapped on the surface of the filter cloth and gradually accumulate to form a filter cake, while the liquid phase passes through the filter cloth and is discharged, thus achieving efficient dewatering of the slurry. This type of equipment has significant advantages such as low filter cake moisture content and high solid phase recovery rate, and is therefore widely used in many industries including wastewater treatment, chemical production, mineral processing, food processing, sludge dewatering, sand washing operations, and electroplating sludge treatment.

[0003] In existing technologies, filter presses typically consist of a thrust plate, a pressure plate, and multiple filter plates arranged in a series. These filter plates work together under pressure, forming closed filter chambers between adjacent plates to sequentially complete processes such as feeding, pressing, drying, and cake discharge. Chamber filter presses are particularly common due to their compact structure and large filtration area. Their filter plates have feed inlets connecting the various filter chambers. When the filter plates are joined and pressed together, these inlets become interconnected, forming a slurry inlet channel that runs through the entire filter plate assembly. During filtration, the slurry is pumped into this channel and then distributed to each filter chamber for pressing.

[0004] However, even after the feeding process is completed and the feed pump and valve are shut off, a large amount of undischarged slurry remains inside the feed channel. This residual slurry gradually dehydrates and deposits during subsequent pressing, leading to channel blockage. Simultaneously, the deposits occupy the effective space of the channel, making it difficult for compressed air used for subsequent filter cake drying to smoothly enter each filter chamber, severely reducing drying efficiency. Furthermore, cleaning the residue inside the channel is extremely inconvenient. Traditional methods typically require manual cleaning after opening the plates or high-pressure water rinsing, which is not only time-consuming and labor-intensive but also has limited cleaning effectiveness and adversely affects the final moisture content of the filter cake. Summary of the Invention

[0005] The purpose of this invention is to provide a purging method for a filtration unit, a filter press, and a slurry inlet channel, in order to solve the technical problems mentioned in the background art.

[0006] The embodiments of the present invention are implemented as follows: In a first aspect, embodiments of this application provide a filtration unit, including a filtration unit body, which includes a thrust plate, a movable pressure plate, and a plurality of filter plates for pressure filtration. Each of the filter plates is provided with two feed inlets, so that when the filtration unit body is in a compressed state, the feed inlets form two slurry inlet channels; two guide pipes are respectively disposed on the thrust plate side and the movable pressure plate side of the filtration unit body, and the two guide pipes are used to form a loop-shaped guide channel together with the two slurry inlet channels when the filtration unit body is in a compressed state; a slurry inlet pipe is connected to one of the guide pipes; and a purging assembly, which includes an air blowing pipe and a slurry discharge pipe, both of which are connected to the guide pipe provided with the slurry inlet pipe, and the air blowing pipe and the slurry discharge pipe are respectively located on both sides of the slurry inlet pipe; wherein a first gate valve is provided on the section of the guide pipe located between the slurry inlet pipe and the slurry discharge pipe, and a second gate valve and a third gate valve are respectively provided on the air blowing pipe and the slurry discharge pipe.

[0007] Furthermore, based on the aforementioned scheme, the thrust plate is provided with two feeding ports, which are respectively connected to the two slurry inlet channels; the guide pipe on the thrust plate side of the filter unit body is connected to the two slurry inlet channels through the two feeding ports.

[0008] Furthermore, based on the aforementioned scheme, the movable pressure plate is provided with two guide ports, which are respectively connected to the two slurry inlet channels; the guide pipe on the movable pressure plate side of the filter unit body is connected to the two slurry inlet channels through the two guide ports.

[0009] Furthermore, based on the aforementioned scheme, the two aforementioned feeding ports and their corresponding guide pipes, as well as the two aforementioned guide ports and their corresponding guide pipes, are detachably connected via a flange structure.

[0010] Furthermore, based on the aforementioned scheme, the slurry inlet pipe is connected to the middle section of the corresponding feed pipe.

[0011] Furthermore, based on the aforementioned scheme, the air blowing pipe and the slurry discharge pipe are detachably connected to the corresponding material guide pipe.

[0012] Furthermore, based on the aforementioned scheme, a fourth gate valve is provided on the feed pipe on the movable pressure plate side of the main body of the filter unit.

[0013] In a second aspect, this application provides a filter press, comprising: a filter unit as described in the first aspect above; and a frame assembly, a hydraulic pressing mechanism, a filtrate discharge mechanism, an automatic plate unloading mechanism, a pipeline auxiliary mechanism, and an electrical control mechanism adapted to the filter unit.

[0014] Thirdly, this application also provides a purging method for the filter press feed channel based on the second aspect described above, comprising the following steps: Feeding and filtration steps: Open the first gate valve, close the second, third and fourth gate valves, and feed slurry into the two feed channels through the feed pipe. The slurry then enters the filter chamber between the filter plates through each feed channel for filtration. Purging steps: Close the first gate valve, open the second, third and fourth gate valves, keep the filter unit body in a compressed state, and introduce high-pressure gas into the feed pipe with the feed pipe through the air blowing pipe. The high-pressure gas enters through one feed channel connected to the feed pipe, and after passing through another feed pipe, it enters another feed channel. The residual slurry in the two feed channels is discharged from the discharge pipe. Drying step: Keep the first gate valve closed and continuously introduce high-pressure gas into the loop guide channel. The high-pressure gas is diverted through the feed inlet on each of the filter plates and enters each of the filter chambers to dry the filter cake. Unloading steps: Turn off the high-pressure air source, remove the clamping state, and pull open each of the above filter plates in sequence to unload the filter cake.

[0015] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: Regarding the first aspect, in the filter unit provided by this application, during the pressure filtration operation, the first gate valve is opened, and the second and third gate valves are closed. After the slurry is fed into one of the guide pipes through the slurry inlet pipe, the guide pipe is connected to the other guide pipe through the double slurry inlet channel to form a loop-shaped guide channel. The slurry can be simultaneously diverted to the filter chamber between each filter plate through the two slurry inlet channels, achieving efficient and balanced pressure filtration feeding. After the feeding is completed, the first gate valve is closed and the second and third gate valves are opened. At this time, compressed air enters the guide pipe with the slurry inlet pipe through the air blowing pipe. Since the first gate valve has cut off the passage between the slurry inlet pipe and the slurry outlet pipe on the guide pipe, the airflow can only enter through one slurry inlet channel, and after being guided through the other guide pipe, it enters the other slurry inlet channel and is finally discharged from the slurry outlet pipe. During this process, the residual slurry in the two slurry inlet channels is discharged from the slurry outlet pipe along with the airflow. This solution, through a simple switch of the gate valve assembly, allows for directional purging of the U-shaped guide channel using compressed air without disassembling the filter plates or interrupting the pressing state of the filter press. This removes residual slurry from the channel, preventing slurry deposition and clogging from the source, and providing a smooth airflow path for the subsequent drying process. This significantly improves drying efficiency while greatly reducing the frequency and intensity of manual cleaning. It also helps to stably control the final moisture content of the filter cake and has the outstanding advantages of compact structure, simple control, and reliable operation.

[0016] Regarding the second aspect, the filter unit and filter press containing it provided in this application form a loop-shaped flow channel through the dual slurry inlet channel and the two side guide pipes. With the switching control of the first, second and third gate valves, balanced feeding can be achieved during filtration. After feeding, compressed air is used to directionally blow the loop-shaped channel to concentrate and discharge the residual slurry. Thus, without disassembling the filter plate, the channel can be effectively prevented from being blocked by sediment, the drying efficiency can be improved and the intensity of manual cleaning can be reduced.

[0017] Regarding the third aspect, the purging method provided in this application uses the aforementioned loop-shaped guide channel as a gas distribution main pipe after it is emptied, so that the high-pressure gas is evenly distributed to each filter chamber. This eliminates the cost of separate drying pipelines and achieves a one-step merging of channel purging and filter cake drying, significantly shortening the drying time and improving the overall operating efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an isometric view of a filtering unit according to an embodiment of the present invention; Figure 2 for Figure 1 A partial schematic diagram; Figure 3 This is a simplified diagram of a filter unit in a compressed state according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the filter plate structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the filter press according to an embodiment of the present invention.

[0020] Icons: 1- Feed guide pipe, 2- Thrust plate, 3- Filter plate, 301- Filter chamber, 302- Feed inlet, 4- Movable pressure plate, 5- Air blowing pipe, 6- Slurry discharge pipe, 7- Slurry inlet pipe, 8- First gate valve, 9- Second gate valve, 10- Third gate valve, 11- Fourth gate valve, 12- Slurry inlet channel. Detailed Implementation

[0021] The embodiments of this application will now be described in detail with reference to the accompanying drawings. Example 1

[0022] Please refer to Figure 1Figure 4 shows an embodiment of this application providing a filtration unit, including a filtration unit body, which includes a thrust plate 2, a movable pressure plate 4, and multiple filter plates 3 for pressure filtration. Each filter plate 3 is provided with two feed inlets 302, so that when the filtration unit body is in a compressed state, the feed inlets 302 form two slurry inlet channels 12; two guide pipes 1 are respectively disposed on the thrust plate 2 side and the movable pressure plate 4 side of the filtration unit body, and the two guide pipes 1 are used to connect with the two slurry inlet channels 12 when the filtration unit body is in a compressed state. 2. Together they form a U-shaped flow channel; a slurry inlet pipe 7, which is connected to one of the aforementioned feed pipes 1; and a purging assembly, which includes an air blowing pipe 5 and a slurry discharge pipe 6, both of which are connected to the feed pipe 1 on which the slurry inlet pipe 7 is provided, and the air blowing pipe 5 and the slurry discharge pipe 6 are respectively located on both sides of the slurry inlet pipe 7; wherein, a first gate valve 8 is provided on the section of the feed pipe 1 located between the slurry inlet pipe 7 and the slurry discharge pipe 6, and a second gate valve 9 and a third gate valve 10 are respectively provided on the air blowing pipe 5 and the slurry discharge pipe 6.

[0023] During the filter press operation, the first gate valve 8 is opened and the second gate valve 9 and the third gate valve 10 are closed. The slurry is fed into one of the feed pipes 1 through the feed pipe 7. Since the feed pipe 1 is connected to the other feed pipe 1 through the double feed port 302 to form a loop flow channel, the slurry can be simultaneously diverted to the filter chambers between the filter plates 3 through the two feed channels 12, achieving efficient and balanced filter press feeding. After feeding is completed, the first gate valve 8 is closed and the second gate valve 9 and the third gate valve 10 are opened. At this time, compressed air enters the feed pipe 1 with the feed pipe 7 through the air blowing pipe 5. Since the first gate valve 8 has cut off the passage between the feed pipe 7 and the discharge pipe 6 on the feed pipe 1, the airflow can only enter through one feed channel 12, and after being guided by the other feed pipe 1, it enters the other feed channel 12 and is finally discharged from the discharge pipe 6. During this process, the residual slurry in the two feed channels 12 is discharged from the discharge pipe 6 along with the airflow. This solution, through a simple switch of the gate valve assembly, allows for directional purging of the U-shaped guide channel using compressed air without disassembling filter plate 3 or interrupting the pressing state of the filter press. This removes residual slurry from the channel, preventing slurry deposition and clogging from the source, and providing a smooth airflow path for subsequent drying processes. This significantly improves drying efficiency while greatly reducing the frequency and intensity of manual cleaning. It also helps to stably control the final moisture content of the filter cake and has the outstanding advantages of compact structure, simple control, and reliable operation.

[0024] In a preferred embodiment, the thrust plate 2 is provided with two feeding ports, which are respectively connected to the two slurry inlet channels 12; the guide pipe 1 on the thrust plate 2 side of the filter unit body is connected to the two slurry inlet channels 12 through the two feeding ports.

[0025] In the above embodiment, by setting two feeding ports on the thrust plate 2 and connecting the two feeding ports to the two slurry inlet channels 12 one by one, and connecting the guide pipe 1 on the side of the thrust plate 2 to the two slurry inlet channels 12 through the two feeding ports, the guide pipe 1 on the side of the thrust plate 2 can form a complete docking passage with the two slurry inlet channels 12 when the filter unit body is in a compressed state, ensuring that the slurry is synchronously and evenly distributed to each slurry inlet channel 12 and each filter chamber 301 through the guide pipe 1 and the two feeding ports during the feeding stage.

[0026] It is understandable that the thrust plate 2 and the movable pressure plate 4 are spaced apart, and multiple filter plates 3 are arranged in a straight line between them. The multiple filter plates 3 can be pressed onto the thrust plate 2 in sequence by the movable pressure plate 4. The guide pipe 1 located on the side of the thrust plate 2 is connected to the side of the thrust plate 2 away from the movable pressure plate 4.

[0027] In a preferred embodiment, the movable pressure plate 4 is provided with two feed inlets, which are respectively connected to the two feed channels 12. The feed pipe 1 on the movable pressure plate 4 side of the filter unit body is connected to the two feed channels 12 through the two feed inlets.

[0028] In the above embodiment, by setting two guide ports on the movable pressure plate 4 and connecting the two guide ports to the two slurry inlet channels 12 one by one, and connecting the guide pipe 1 on the side of the movable pressure plate 4 to the two slurry inlet channels 12 through the two guide ports, when the filter unit body is in the compressed state, the guide pipe 1 on the side of the movable pressure plate 4 can form a complete confluence and docking path with the dual slurry inlet channels 12, ensuring that the airflow carrying residual slurry during the purging stage can transition from one slurry inlet channel 12 to the other slurry inlet channel 12 and finally be discharged through the slurry discharge pipe 6, thereby realizing the full-path purging of the loop guide channel, significantly improving the thoroughness of purging and the smoothness of slurry discharge.

[0029] It is understandable that the guide pipe 1 located on the side of the movable pressure plate 4 is connected to the side of the movable pressure plate 4 away from the thrust plate 2.

[0030] In a preferred embodiment, the two feed ports and the corresponding guide pipes 1, as well as the two guide ports and the corresponding guide pipes 1, are detachably connected by a flange structure.

[0031] In the above embodiments, the flange structure enables detachable connection, which facilitates quick assembly and disassembly between the guide pipe 1 and the feed port and guide port, and is beneficial for daily inspection, cleaning and replacement of parts.

[0032] In a preferred embodiment, the slurry inlet pipe 7 is connected to the middle section of the feed pipe 1.

[0033] In the above embodiment, the slurry inlet pipe 7 is connected to the middle section of the feed pipe 1, which allows the slurry to be evenly distributed from the middle to both sides to the two slurry inlet channels 12 at the same time, thereby ensuring the feeding balance.

[0034] In a preferred embodiment, the air blowing pipe 5 and the slurry discharge pipe 6 are detachably connected to the corresponding material guide pipe 1.

[0035] In the above embodiments, the air blowing pipe 5 and the slurry discharge pipe 6 are detachably connected to the corresponding material guide pipe 1, which facilitates independent disassembly, replacement or cleaning according to actual working conditions, and helps to reduce maintenance difficulty and cost.

[0036] In a preferred embodiment, a fourth gate valve 11 is provided on the feed pipe 1 on the movable pressure plate 4 side of the filter unit body.

[0037] In the above embodiment, by setting a fourth gate valve 11 on the feed pipe 1 on the side of the movable pressure plate 4, closing the valve during filter pressing allows the slurry to be trapped in the two feed channels 12 and fully diverted to each filter chamber 301; opening the valve during purging provides a smooth discharge path for the residual slurry in the channel. Example 2

[0038] Please refer to Figure 5 This application provides a filter press, including: a filter unit as described in Embodiment 1 above; and a frame assembly, a hydraulic pressing mechanism, a filtrate discharge mechanism, an automatic plate unloading mechanism, a pipeline auxiliary mechanism, and an electrical control mechanism adapted to the filter unit.

[0039] The filter unit and filter press containing it provided in this application form a loop-shaped flow channel through the double slurry inlet channel 12 and the two side guide pipes 1. With the switching control of the first, second and third gate valves 10, balanced feeding can be achieved during filtration. After feeding, compressed air is used to directionally blow the loop-shaped channel to concentrate and discharge the residual slurry. Thus, without disassembling the filter plate 3, the channel can be effectively prevented from being blocked by sediment, the drying efficiency can be improved and the intensity of manual cleaning can be reduced. Example 3

[0040] This application embodiment also provides a purging method based on the filter press feed channel 12 in embodiment 2 above, including the following steps: Feeding and filtration steps: Open the first gate valve 8, close the second gate valve 9, the third gate valve 10 and the fourth gate valve 11, and feed the slurry to the two slurry channels 12 through the slurry inlet pipe 7. The slurry then enters the filter chamber 301 between the filter plates 3 through each of the slurry inlet channels 12 for filtration. Purging steps: Close the first gate valve 8, open the second gate valve 9, the third gate valve 10 and the fourth gate valve 11, keep the filter unit body in a compressed state, and introduce high-pressure gas into the feed pipe 1 with the feed pipe 7 through the air blowing pipe 5. The high-pressure gas enters through one feed channel 12 connected to the feed pipe 1, and enters another feed channel 12 after being connected through another feed pipe 1. The residual slurry in the two feed channels 12 is discharged from the discharge pipe 6. Drying step: Keep the first gate valve 8 closed and continuously introduce high-pressure gas into the loop guide channel. The high-pressure gas is diverted through the feed inlet 302 on each of the filter plates 3 and enters each of the filter chambers to dry the filter cake. Unloading steps: Turn off the high-pressure air source, remove the clamping state, and pull open each of the above filter plates 3 in sequence to unload the filter cake.

[0041] The purging method uses the hollowed-out guide channel as a gas distribution main pipe, which allows high-pressure gas to be evenly distributed to each filter chamber. This eliminates the cost of separate drying pipelines and combines channel purging and filter cake drying in one step, significantly shortening the drying time and improving overall operating efficiency.

[0042] Furthermore, unless otherwise explicitly specified or limited, the terms "installation" and "connection" in this application embodiment should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "upper," "lower," "left," "right," "inner," "outer," and "side," etc., are merely for reference to the direction in the accompanying drawings or the usual placement of the product during use. They are only for clearly describing this application and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application. The terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance; "multiple" refers to at least two. In this application embodiment, the limitations on relative positional relationships such as parallel, perpendicular, and aligned are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallel, perpendicular, and aligned are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.

[0043] The above are only some embodiments and implementation methods of this application. The protection scope of this application is not limited thereto. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of this application. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A filter unit, characterized in that, include The filter unit body includes a thrust plate (2) for pressure filtration, a movable pressure plate (4) and a plurality of filter plates (3). Each filter plate (3) is provided with two feed inlets (302) so that when the filter unit body is in a compressed state, each feed inlet (302) forms two slurry inlet channels (12). Two guide pipes (1) are respectively set on the thrust plate (2) side and the movable pressure plate (4) side of the filter unit body, and the two guide pipes (1) are used to form a loop guide channel together with the two slurry inlet channels (12) when the filter unit body is in a compressed state. A slurry inlet pipe (7), which is connected to one of the feed pipes (1); and The purging assembly includes an air blowing pipe (5) and a slurry discharge pipe (6), both of which are connected to the feed pipe (1) provided with the slurry inlet pipe (7), and the air blowing pipe (5) and the slurry discharge pipe (6) are located on both sides of the slurry inlet pipe (7); A first gate valve (8) is provided on the section of the guide pipe (1) located between the slurry inlet pipe (7) and the slurry outlet pipe (6), and a second gate valve (9) and a third gate valve (10) are provided on the air blowing pipe (5) and the slurry outlet pipe (6), respectively.

2. The filter unit according to claim 1, characterized in that, The thrust plate (2) is provided with two feeding ports, which are respectively connected to the two slurry inlet channels (12); The guide pipe (1) on the thrust plate (2) side of the filter unit body is connected to the two slurry inlet channels (12) through the two feed ports.

3. The filter unit according to claim 2, characterized in that, The movable pressure plate (4) is provided with two material guide ports, which are used to connect one-to-one with the two slurry inlet channels (12); The feed pipe (1) on the side of the movable pressure plate (4) of the filter unit body is connected to the two feed channels (12) through the two feed ports.

4. The filter unit according to claim 3, characterized in that, The two feed ports and the corresponding guide pipes (1) are detachably connected by a flange structure.

5. The filter unit according to claim 1, characterized in that, The slurry inlet pipe (7) is connected to the middle section of the corresponding feed pipe (1).

6. The filter unit according to claim 1, characterized in that, The air blowing pipe (5) and the slurry discharge pipe (6) are detachably connected to the corresponding material guide pipe (1).

7. The filter unit according to claim 1, characterized in that, A fourth gate valve (11) is provided on the feed pipe (1) on the side of the movable pressure plate (4) of the filter unit body.

8. A filter press, characterized in that, include: The filtering unit as described in claim 7; as well as The filter unit is equipped with a frame assembly, a hydraulic clamping mechanism, a filtrate discharge mechanism, an automatic plate unloading mechanism, a pipeline auxiliary mechanism, and an electrical control mechanism.

9. A purging method based on the filter press feed channel (12) according to claim 8, characterized in that, Includes the following steps: Feeding and filtration steps: Open the first gate valve (8), close the second gate valve (9), the third gate valve (10) and the fourth gate valve (11), and feed the slurry to the two slurry channels (12) through the slurry inlet pipe (7), and then feed the slurry into the filter chamber (301) between the filter plates (3) through each of the slurry inlet channels (12) for filtration. Purging steps: Close the first gate valve (8), open the second gate valve (9), the third gate valve (10) and the fourth gate valve (11), keep the filter unit body in a compressed state, and introduce high pressure gas into the guide pipe (1) with the slurry inlet pipe (7) through the air blowing pipe (5). The high pressure gas enters through one of the slurry inlet channels (12) connected to the guide pipe (1), and enters another slurry inlet channel (12) after being connected through another guide pipe (1). The residual slurry in the two slurry inlet channels (12) is discharged from the slurry discharge pipe (6). Drying step: Keep the first gate valve (8) closed, and continuously introduce high-pressure gas into the loop guide channel. The high-pressure gas is diverted into each filter chamber through the feed inlet (302) on each filter plate (3) to dry the filter cake. Unloading steps: Turn off the high-pressure air source, remove the compressed state, and pull open each of the filter plates (3) in sequence to remove the filter cake.

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