A high-efficiency dewatering device for fly ash water washing slurry

Abstract

The application relates to the technical field of filter pressing dewatering, and provides a high-efficiency dewatering device for fly ash water washing slurry, which comprises a primary filter pressing bin, a primary filter pressing mechanism, a secondary filter pressing bin and a filter water bin arranged below the secondary filter pressing bin, a plurality of secondary filter pressing bins are connected to the outer side of the upper portion of the primary filter pressing bin, the secondary filter pressing bin is provided with a feeding port in communication with the interior of the primary filter pressing bin, the feeding port is provided with a second feeding door capable of being opened and closed, the bottom of the secondary filter pressing bin is formed with a fixed filter pressing plate, the fixed filter pressing plate is provided with a plurality of second water passing holes, the secondary filter pressing bin and the filter water bin are in communication through the second water passing holes, and the high-efficiency dewatering device can realize fine and efficient filter pressing of slurry.

Description

Technical Field

[0001] This application relates to the field of filter press dewatering technology, and more specifically, to a high-efficiency dewatering device for fly ash washing slurry. Background Technology

[0002] Currently, fly ash produced during municipal solid waste incineration can be used to prepare foamed ceramic materials. The calcium oxide, silicon dioxide, and aluminum oxide components in the fly ash can enhance the strength and durability of ceramic products during high-temperature firing, providing a potential source of raw materials for the production of foamed ceramics.

[0003] Although fly ash has certain application potential in ceramic preparation, its high chloride ion content directly affects the quality of ceramic products, potentially leading to porous structure, reduced strength, and decreased durability. Therefore, in the process of preparing foamed materials using fly ash, the water washing and dechlorination process for mortar preparation is a crucial step. Currently, the common water washing and dechlorination process for mortar preparation involves using clean water or circulating filtrate as washing water, mixing fly ash with the washing liquid in a certain proportion, soaking the mixture, and then stirring to promote the dissolution of chloride ions and heavy metals, thus producing a mortar that meets the requirements.

[0004] In the process of preparing foamed ceramic materials, slurry also needs to be dewatered by pressure filtration. Existing filter presses for slurry often simply use a movable filter plate to filter the slurry in a large filter chamber. A large amount of slurry is filtered in the filter chamber, and the later stage of the filter press requires a large driving force to push the movable filter plate to filter. Usually, the problem of poor slurry filtration effect may occur due to insufficient driving force of the movable filter plate of the filter press. This results in a large amount of water still remaining in the slurry after filtration. Summary of the Invention

[0005] In view of this, this application provides a high-efficiency dewatering device for fly ash washing slurry to solve the technical problem of poor filtration effect of existing filter presses for slurry.

[0006] This application provides a high-efficiency dewatering device for fly ash washed slurry, wherein the high-efficiency dewatering device for fly ash washed slurry includes:

[0007] A primary filter press chamber, the top of which is provided with a top cover, the top cover being provided with a slurry inlet leading to the interior of the primary filter press chamber, and the slurry inlet being provided with a first feed door that can be opened and closed;

[0008] A primary filter press mechanism includes a lifting drive mechanism and a movable filter press plate. The lifting drive mechanism includes a fixed part disposed on the top cover and a telescopic part that is vertically connected to the fixed part. The telescopic part penetrates the top cover and extends into the interior of the primary filter press chamber. The movable filter press plate has a plurality of first water passage holes. The movable filter press plate is located inside the primary filter press chamber and is sealed to the inner side wall of the primary filter press chamber. The movable filter press plate is connected to the telescopic part.

[0009] The filter press includes a secondary filter chamber and a water filter chamber located below the secondary filter chamber. Multiple secondary filter chambers are connected to the upper outer side of the primary filter chamber. Each secondary filter chamber has a feed port that communicates with the interior of the primary filter chamber. The feed port is equipped with a second feed door that can be opened and closed. A fixed filter plate is formed at the bottom of the secondary filter chamber. The fixed filter plate has multiple second water passage holes. The secondary filter chamber and the water filter chamber communicate with each other through the second water passage holes.

[0010] The secondary filter press mechanism includes a pressure plate that can be lifted and lowered within the secondary filter press chamber.

[0011] Furthermore, the top of the secondary filter press chamber is provided with a downwardly protruding stop structure near the feed port. The middle part of the second feed door in the height direction is rotatably mounted on the inner wall of the secondary filter press chamber via a rotating shaft. A torsion spring is provided on the rotating shaft. The torsion spring applies an elastic force to the second feed door to press the upper end of the second feed door against the stop structure, so as to close the second feed door. When the movable filter press plate moves upward, it can drive the slurry on it towards the secondary filter press chamber, pushing the lower part of the second feed door towards the interior of the secondary filter press chamber, so as to open the second feed door.

[0012] Furthermore, an annular vertical plate is provided on the outer edge of the movable filter press plate. During the upward movement of the movable filter press plate, the annular vertical plate can press against the upper part of the second feed door towards the secondary filter press chamber to close the second feed door.

[0013] Furthermore, the pressure plate is connected to the top of the secondary filter press chamber via an elastic element. A guide rod penetrating the top of the secondary filter press chamber is connected to the upper end of the pressure plate. A convex ring platform is provided on the section of the guide rod above the secondary filter press chamber. A lifting arm is connected to the section of the telescopic part above the top cover. The lifting arm is sleeved on the guide rod and located above the convex ring platform. When the lifting arm descends, it can press down on the convex ring platform, causing the guide rod to drive the pressure plate to move downward against the elastic force of the elastic element. When the lifting arm contacts the convex ring platform, the upper end face of the annular vertical plate is lower than the lower end face of the feed port.

[0014] Furthermore, the bottom of the water filtration chamber is connected to the bottom of the primary filter press chamber via a water inlet pipe.

[0015] Furthermore, the upper outer ring of the primary filter press chamber is provided with at least 8 secondary filter press chambers.

[0016] Furthermore, a drain pipe is provided on the outer side of the bottom of the primary filter press chamber, and the drain pipe leads to the interior of the primary filter press chamber.

[0017] Furthermore, the outer wall of the primary filter press chamber is connected to a discharge pipe, which leads to the interior of the primary filter press chamber.

[0018] Furthermore, the secondary filter press chamber is provided with a discharge port at the end away from the primary filter press chamber, and the discharge port is provided with a discharge gate that can be opened and closed.

[0019] Furthermore, the lifting drive mechanism is a hydraulic cylinder, the fixed part of the lifting drive mechanism is the cylinder body of the hydraulic cylinder, and the telescopic part of the lifting drive mechanism is the piston rod of the hydraulic cylinder.

[0020] The beneficial effects of the high-efficiency dewatering device for fly ash washed slurry provided by the present invention are as follows:

[0021] Compared to existing technologies, the efficient dewatering device for fly ash washing slurry provided by this invention includes a primary filter press chamber, a primary filter press mechanism, a secondary filter press chamber, and a secondary filter press mechanism. Multiple secondary filter press chambers are connected to the upper outer side of the primary filter press chamber. When the dewatered and dried slurry enters the primary filter press chamber through the slurry inlet and is supported on the upper part of the movable filter plate, due to the gravity of the water in the slurry, some water flows through the first water passage of the movable filter plate to the area below the movable filter plate. At this time, the second feed gate is opened, and the movable filter plate is driven upward by the lifting drive mechanism. On the one hand, the slurry on the movable filter plate is squeezed between the top cover and the movable filter plate, causing water to flow through the first water passage of the movable filter plate to the area below the movable filter plate. On the other hand, as the slurry on the movable filter plate is gradually pressed into the secondary filter press chamber, the second feed gate can be closed, and the pressure plate in the secondary filter press mechanism moves downward to compress the secondary filter press chamber. In the slurry, the water in the slurry in the secondary filter press chamber is filtered out and flows into the filter chamber through the second water passage. Therefore, the whole slurry flow supported on the movable filter plate in the original primary filter press chamber first undergoes primary filtration in the primary filter press chamber. During the filtration process, it is gradually broken into multiple smaller slurry flows that enter the secondary filter press chamber. This eliminates the need to apply a large driving force to the movable filter plate. Then, the whole slurry is broken into multiple smaller slurry flows that enter the secondary filter press chamber for secondary filtration. The pressure required for each pressure plate to apply pressure during the secondary filtration process is much less than the pressure required to filter the whole slurry flow together. This allows for more effective individual filtration of the whole slurry flow. Multiple secondary filter press chambers achieve independent filtration of smaller slurry flows, which can greatly reduce the force required to filter the slurry. Therefore, the high-efficiency dewatering device provided by this invention can achieve fine and efficient filtration of slurry through multiple secondary filter press chambers and secondary filtration mechanisms. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a three-dimensional schematic diagram showing a portion of the structure of a high-efficiency dewatering device for fly ash washing slurry according to an embodiment of this application.

[0024] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0026] Figure 4 This is a perspective view of a high-efficiency dewatering device for fly ash washing slurry according to an embodiment of this application;

[0027] Figure 5 for Figure 4 Enlarged view of point C in the middle;

[0028] Figure 6 This is a three-dimensional schematic diagram of the primary and secondary filter press mechanisms in a high-efficiency dewatering device for fly ash washing slurry according to an embodiment of this application;

[0029] Figure 7 This is a partial schematic diagram of a high-efficiency dewatering device for fly ash washed slurry according to an embodiment of this application, during a secondary pressure filtration operation.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-First feed gate; 2-Filter chamber; 3-Second feed gate; 4-Pressure plate; 5-Rotating shaft; 6-Annular vertical plate; 7-Guide rod; 8-Protruding ring platform; 9-Lifting arm; 10-Water inlet pipe; 11-Drainage pipe; 12-Discharge pipe; 13-Discharge gate; 14-Elastic component; 100-First-stage filter press chamber; 200-Top cover; 201-Slurry inlet; 300-Lifting drive mechanism; 301-Fixing part; 302-Telescopic part; 400-Movable filter press plate; 401-First water passage hole; 500-Second-stage filter press chamber; 501-Feed port; 502-Fixing filter press plate; 503-Second water passage hole; 504-Protruding crossbeam. Detailed Implementation

[0032] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. One or more embodiments of this application are exemplarily shown in the drawings to provide a more accurate and thorough understanding of the technical solutions disclosed herein. However, it should be understood that this application can be implemented in many different forms and is not limited to the embodiments described below.

[0033] In the accompanying drawings of this application, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0034] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0035] It is understood that the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0036] See Figures 1 to 7 This application provides a high-efficiency dewatering device for fly ash washed slurry, wherein the high-efficiency dewatering device for fly ash washed slurry includes:

[0037] The primary filter press chamber 100 has a top cover 200 on its top. The top cover 200 has a slurry inlet 201 leading to the interior of the primary filter press chamber 100. The slurry inlet 201 has a first feed door 1 that can be opened and closed, that is, the first feed door 1 can close the slurry inlet 201 or open the slurry inlet 201.

[0038] The primary filter press mechanism includes a lifting drive mechanism 300 and a movable filter press plate 400. The lifting drive mechanism 300 includes a fixed part 301 disposed on the top cover 200 and a telescopic part 302 that is movably connected to the fixed part 301. The telescopic part 302 penetrates the top cover 200 and extends into the interior of the primary filter press chamber 100. The movable filter press plate 400 has a plurality of first water passage holes 401. The movable filter press plate 400 is located inside the primary filter press chamber 100 and is sealed to the inner side wall of the primary filter press chamber 100. The movable filter press plate 400 is connected to the telescopic part 302. The lifting drive mechanism 300 is, for example, a hydraulic cylinder. The fixed part 301 of the lifting drive mechanism 300 is the cylinder body of the hydraulic cylinder, and the telescopic part 302 of the lifting drive mechanism 300 is the piston rod of the hydraulic cylinder.

[0039] The secondary filter press chamber 500 and the water filter chamber 2 located below the secondary filter press chamber 500 are connected to the upper outer side of the primary filter press chamber 100. The secondary filter press chamber 500 has a feed port 501 that communicates with the interior of the primary filter press chamber 100. A second feed door 3 that can be opened and closed is provided at the feed port 501. A fixed filter plate 502 is formed at the bottom of the secondary filter press chamber 500. The fixed filter plate 502 has multiple second water passage holes 503. The secondary filter press chamber 500 and the water filter chamber 2 are connected through the second water passage holes 503.

[0040] The secondary filter press mechanism includes a pressure plate 4 that is vertically and retractably disposed in the secondary filter press chamber 500.

[0041] Because the efficient dewatering device for fly ash washed slurry provided by the present invention includes a primary filter press 100, a primary filter press mechanism, a secondary filter press 500, and a secondary filter press mechanism, with multiple secondary filter press 500 connected to the upper outer side of the primary filter press 100, when the dewatered and dried slurry enters the primary filter press 100 through the slurry inlet 201 and is supported on the upper part of the movable filter press 400, due to the gravity of the water in the slurry, a portion of the water flows into the movable filter press 400 through the first water passage 401. Below 0, the second feed gate 3 is opened, and the movable filter plate 400 is driven to rise by the lifting drive mechanism 300. On the one hand, the slurry on the movable filter plate 400 is squeezed between the top cover 200 and the movable filter plate 400, causing water to flow through the first water passage 401 of the movable filter plate 400 to the area below the movable filter plate 400. On the other hand, as the slurry on the movable filter plate 400 is gradually pressed into the secondary filter chamber 500, the second feed gate 3 can be closed, and the pressure plate 4 in the secondary filter mechanism moves downward. The slurry in the secondary filter press chamber 500 is compressed by the dynamic pressure. The water in the slurry in the secondary filter press chamber 500 is filtered out and flows into the filter chamber 2 through the second water passage 503. Therefore, the whole slurry flow supported on the movable filter plate 400 in the original primary filter press chamber 100 first undergoes primary filtration in the primary filter press chamber 100. Moreover, during the filtration process, it will be gradually broken into multiple smaller slurry flows that enter the secondary filter press chamber 500. Thus, it is not necessary to apply a large driving force to the movable filter plate 400. Then the whole slurry is broken into multiple smaller volumes. A smaller slurry flow enters the secondary filter press chamber 500 for secondary filtration. During the secondary filtration process, the pressure required for each pressure plate 4 to apply pressure is much less than the pressure required to filter the entire slurry flow together. This allows for more effective individual filtration of the entire slurry flow. Multiple secondary filter press chambers 500 enable independent filtration of smaller slurry flows, which can greatly reduce the force required for slurry filtration. Therefore, the high-efficiency dewatering device provided by this invention can achieve fine and efficient slurry filtration through multiple secondary filter press chambers 500 and a secondary filtration mechanism.

[0042] According to one embodiment of this application, a downwardly protruding stop structure (e.g., a protruding crossbeam 504) is provided on the top of the secondary filter press 500 near the feed port 501. The middle part of the second feed door 3 in the height direction is rotatably mounted on the inner wall of the secondary filter press 500 via a rotating shaft 5. A torsion spring (not shown) is provided on the rotating shaft 5. The torsion spring applies an elastic force to the second feed door 3 to press the upper end of the second feed door 3 against the stop structure, so that the second feed door 3 is closed. When the movable filter press plate 400 moves upward, it can drive the slurry on it toward the secondary filter press 500 and push the lower part of the second feed door 3 toward the interior of the secondary filter press 500, so that the second feed door 3 is opened. In this way, the slurry in the primary filter press 100 gradually enters the secondary filter press 500.

[0043] According to another embodiment of this application, the second feed door 3 can be an automatic door. Specifically, the middle part of the second feed door 3 in the height direction is rotatably installed on the inner wall of the secondary filter press 500 via a rotating shaft 5. The second feed door 3 is fixedly connected to the rotating shaft 5, which is rotatably installed on the inner wall of the secondary filter press 500. The rotating shaft 5 is equipped with a motor, and the output shaft of the motor drives the rotating shaft 5 to rotate, thereby driving the second feed door 3 to rotate to realize the opening and closing action.

[0044] According to one embodiment of this application, an annular vertical plate 6 is provided on the outer edge of the movable filter press plate 400. During the upward movement of the movable filter press plate 400, the annular vertical plate 6 can press against the upper part of the second feed gate 3 towards the secondary filter press chamber 500 to close the second feed gate 3. In specific operation, during the upward movement of the movable filter press plate 400, the space between the movable filter press plate 400 and the top cover 200 becomes smaller and smaller. First, the slurry in the primary filter press chamber 100 is gradually squeezed into the secondary filter press chamber 500. During this process, the movable filter press plate 400 performs a first-stage filtration operation on the slurry supported above it. After the annular vertical plate 6 continues to rise to the height of the corresponding feed port 501, the annular vertical plate 6 presses against the upper part of the second feed gate 3 towards the secondary filter press chamber 500 to close the second feed gate 3. After the second feed gate 3 is closed, the slurry in the secondary filter press chamber 500 can be squeezed downward by the pressure plate 4 in the secondary filter press mechanism to perform a secondary filtration and dewatering effect.

[0045] According to a preferred embodiment of this application, the pressure plate 4 is connected to the top of the secondary filter press chamber 500 by an elastic element 14 (e.g., a spring). The upper end of the pressure plate 4 is connected to a guide rod 7 that penetrates the top of the secondary filter press chamber 500. A convex ring platform 8 is provided on the section of the guide rod 7 above the secondary filter press chamber 500. A lifting arm 9 is connected to the section of the telescopic part 302 above the top cover 200. The lifting arm 9 is sleeved on the guide rod 7 and located above the convex ring platform 8. The lifting arm 9 can slide up and down along the guide rod 7. When the lifting arm 9 descends, it can press down on the convex ring. Platform 8, causing guide rod 7 to drive pressure plate 4 to move downwards against the elastic force of elastic element. When lifting arm 9 contacts convex ring platform 8, the upper end face of annular vertical plate 6 is lower than the lower end face of feed port 501. In specific operation, as movable filter press plate 400 rises from its initial position (at which time lifting arm 9 is still above convex ring platform 8), the space between movable filter press plate 400 and top cover 200 becomes smaller and smaller. First, the slurry in primary filter press chamber 100 is gradually squeezed into secondary filter press chamber 500, and during this process, movable filter press plate 400 supports the upper part of it. After the slurry undergoes a first-stage filtration operation, the annular vertical plate 6 continues to rise to the height of the corresponding feed port 501. Then, the annular vertical plate 6 presses against the upper part of the second feed gate 3 towards the secondary filter press chamber 500, causing the second feed gate 3 to close. After the second feed gate 3 closes, the movable filter press plate 400 is driven down to a position lower than the initial position by the lifting drive mechanism 300. The movable filter press plate 400 continues to descend, and the lifting arm 9 continues to descend, touching and pressing down on the convex ring platform 8. This allows the pressure plate 4 to move downwards and compress the secondary filter press chamber 500 via the guide rod 7. The slurry in 00 undergoes secondary pressure filtration and dewatering. During this process, the torsion spring applies an elastic force to the second inlet gate 3 to press the upper end of the second inlet gate 3 against the stop structure. Therefore, the force generated by the secondary filter chamber 500 on the second inlet gate 3, combined with the force of the torsion spring, still keeps the upper end of the second inlet gate 3 pressed against the stop structure, thus keeping the second inlet gate 3 closed. The advantage of this embodiment is that the secondary filter mechanism cleverly utilizes the driving force of the lifting drive mechanism 300 in the primary filter mechanism, which greatly simplifies the number of power components and improves space utilization.

[0046] According to one embodiment of this application, the bottom of the filter chamber 2 is connected to the bottom of the primary filter chamber 100 via a water inlet pipe 10, so that the water filtered by the secondary filter chamber 500 eventually flows back to the bottom of the primary filter chamber 100.

[0047] In another embodiment, the water in the filter chamber 2 can be discharged directly without flowing back to the bottom of the primary filter press chamber 100.

[0048] According to a preferred embodiment of this application, the upper outer ring of the primary filter press 100 is provided with at least 8 secondary filter press 500, such as 8, 10 or more secondary filter press 500. More secondary filter press 500 are beneficial to splitting the overall slurry flow in the primary filter press 100 into more parts for independent splitting and filtration, which greatly improves the ability to finely and efficiently filter the slurry.

[0049] According to a specific embodiment of this application, a drain pipe 11 is provided on the outer side of the bottom of the primary filter press chamber 100. The drain pipe 11 leads to the interior of the primary filter press chamber 100, and a valve can be installed on the drain pipe 11. In addition, the outer wall of the primary filter press 100 is connected to a discharge pipe 12, which leads to the interior of the primary filter press 100. A discharge valve can be installed on the discharge pipe 12. The secondary filter press 500 is provided with a discharge port at the end away from the primary filter press 100. A discharge gate 13 that can be opened and closed is provided at the discharge port. The discharge pipe 12 is used to discharge the dewatered slurry that may remain in the primary filter press 100 after filtration. However, in the high-efficiency dewatering device for fly ash washing slurry provided in this application, the core filtration process is in the secondary filter press 500. The overall slurry flow in the primary filter press 100 is basically divided into multiple parts and enters the secondary filter press 500. Therefore, the final large amount of dewatered slurry is mainly discharged after the discharge gate 13 of the secondary filter press 500 is opened.

[0050] It should be noted that the above embodiments only illustrate preferred embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting this application. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of this application, such as combining different features in various embodiments, and these should all fall within the protection scope of this application.

Claims

1. A high-efficiency dewatering device for fly ash washed slurry, characterized in that, The high-efficiency dewatering device for the fly ash washed slurry includes: A primary filter press chamber, the top of which is provided with a top cover, the top cover being provided with a slurry inlet leading to the interior of the primary filter press chamber, and the slurry inlet being provided with a first feed door that can be opened and closed; A primary filter press mechanism includes a lifting drive mechanism and a movable filter press plate. The lifting drive mechanism includes a fixed part disposed on the top cover and a telescopic part that is vertically connected to the fixed part. The telescopic part penetrates the top cover and extends into the interior of the primary filter press chamber. The movable filter press plate has a plurality of first water passage holes. The movable filter press plate is located inside the primary filter press chamber and is sealed to the inner side wall of the primary filter press chamber. The movable filter press plate is connected to the telescopic part. The filter press includes a secondary filter chamber and a water filter chamber located below the secondary filter chamber. Multiple secondary filter chambers are connected to the upper outer side of the primary filter chamber. Each secondary filter chamber has a feed port that communicates with the interior of the primary filter chamber. The feed port is equipped with a second feed door that can be opened and closed. A fixed filter plate is formed at the bottom of the secondary filter chamber. The fixed filter plate has multiple second water passage holes. The secondary filter chamber and the water filter chamber communicate with each other through the second water passage holes. A secondary filter press mechanism includes a pressure plate that is vertically and flexibly disposed in the secondary filter press chamber; the top of the secondary filter press chamber has a downwardly protruding stop structure near the feed port; the middle part of the second feed door in the height direction is rotatably mounted on the inner wall of the secondary filter press chamber via a rotating shaft; a torsion spring is disposed on the rotating shaft; the torsion spring applies an elastic force to the second feed door to press the upper end of the second feed door against the stop structure, thereby closing the second feed door; when the movable filter press plate moves upward, it can drive the slurry on it towards the secondary filter press chamber, pushing the lower part of the second feed door towards the interior of the secondary filter press chamber, thereby opening the second feed door; an annular vertical plate is disposed on the outer edge of the movable filter press plate; during the upward movement of the movable filter press plate, the annular vertical plate can press against the upper part of the second feed door towards the secondary filter press chamber, thereby closing the second feed door; The upper outer ring of the primary filter press chamber is provided with at least 8 secondary filter press chambers.

2. The high-efficiency dewatering device for fly ash washing slurry according to claim 1, characterized in that, The pressure plate is connected to the top of the secondary filter press chamber via an elastic element. A guide rod penetrating the top of the secondary filter press chamber is connected to the upper end of the pressure plate. A convex ring platform is provided on the section of the guide rod above the secondary filter press chamber. A lifting arm is connected to the section of the telescopic part above the top cover. The lifting arm is sleeved on the guide rod and located above the convex ring platform. When the lifting arm descends, it can press down on the convex ring platform, causing the guide rod to drive the pressure plate to move downward against the elastic force of the elastic element. When the lifting arm contacts the convex ring platform, the upper end face of the annular vertical plate is lower than the lower end face of the feed port.

3. The high-efficiency dewatering device for fly ash washing slurry according to claim 1 or 2, characterized in that, The bottom of the filter chamber is connected to the bottom of the primary filter press chamber via a water inlet pipe.

4. The high-efficiency dewatering device for fly ash washing slurry according to claim 1 or 2, characterized in that, A drain pipe is provided on the outer side of the bottom of the primary filter press chamber, and the drain pipe leads to the interior of the primary filter press chamber.

5. The high-efficiency dewatering device for fly ash washing slurry according to claim 1 or 2, characterized in that, The outer wall of the primary filter press chamber is connected to a discharge pipe, which leads to the interior of the primary filter press chamber.

6. The high-efficiency dewatering device for fly ash washing slurry according to claim 1 or 2, characterized in that, The secondary filter press chamber is provided with a discharge port at the end away from the primary filter press chamber, and the discharge port is provided with a discharge gate that can be opened and closed.

7. The high-efficiency dewatering device for fly ash washing slurry according to claim 1 or 2, characterized in that, The lifting drive mechanism is a hydraulic cylinder, the fixed part of the lifting drive mechanism is the cylinder body of the hydraulic cylinder, and the telescopic part of the lifting drive mechanism is the piston rod of the hydraulic cylinder.

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