Filtering device for a segmental filter press

Abstract

The utility model belongs to filter press technical field discloses a kind of filtering devices for sectional filter press, including both sides fixed support, further including filter assembly, the filter assembly is formed by multiple filter plate and filter cloth of juxtaposition arrangement, filter cloth covers in filter plate surface and forms filter chamber;The feed end of the filter assembly is equipped with pressure regulating assembly for inputting material to filter chamber and providing staged pressure.

Description

Technical Field

[0001] This utility model relates to the field of filter press technology, and in particular to a filtration device for a segmented filter press. Background Technology

[0002] Traditional filter presses use constant pressure filtration, which leads to easy clogging of the filter cloth, high moisture content in the filter cake, and long cycle times. Although there is a staged pressurization design, it lacks dynamic coordination with backflushing technology: the filter cloth deployment state is not optimized in the early low-pressure stage, resulting in low free water separation efficiency; the filter cake structure is not specifically compressed during the mid-stage pressurization; and there is no active unclogging mechanism in the later stage, relying on manual cleaning. Summary of the Invention

[0003] To overcome the technical defects of the existing technology, this utility model provides a filtration device for a segmented filter press, which actively clears blockages with pulse backflushing, extends the filter cloth life, and is sufficient to peel off the filter cake without damaging the filter cloth.

[0004] The technical solution adopted in this utility model is as follows: a filtration device for a segmented filter press, including fixed supports on both sides and a filtration assembly. The filtration assembly consists of multiple filter plates and filter cloths arranged in parallel, with the filter cloths covering the surface of the filter plates to form filtration chambers. The feed end of the filtration assembly is provided with a pressure regulating component for inputting materials into the filtration chambers and providing grading pressure. The pressure regulating component includes a feed pressure control unit and a filter plate squeezing unit. The filtration assembly is provided with a backflushing component, which includes a backflushing pipe that penetrates through the filter plates and extends to the back of the filter cloth. A high-pressure air source is installed on the fixed supports. Each filter plate is equipped with a pulse valve. The high-pressure air source is connected to the air inlet of the pulse valve through a branch pipe on the backflushing main pipe. One end of the backflushing pipe is connected to the air outlet of the pulse valve. A PLC controller is installed on the fixed supports. The PLC controller is signal-connected to the pressure regulating component and the backflushing component. The PLC controller is used to control the filtration pressure and backflushing action in segments.

[0005] Preferably, the backflush pipe has a fan-shaped nozzle at one end on the back of the filter cloth, and the opening of the nozzle is perpendicular to the filter cloth.

[0006] Preferably, the filter plate extrusion unit includes a hydraulic cylinder mounted on a fixed bracket for moving all the filter plates.

[0007] Preferably, the filter plate extrusion unit further includes a hydraulic pump mounted on a fixed bracket, the outlet of the hydraulic pump being connected to a main oil circuit connected to a hydraulic cylinder, and a proportional pressure valve being installed on the main oil circuit.

[0008] Preferably, the feed pressure control unit includes a feed pump mounted on a fixed bracket and a feed pipe connected to the filter chamber via the feed pump outlet, with a proportional feed valve installed on the feed pipe.

[0009] Preferably, each of the filter plates is provided with at least three evenly distributed backflush pipes.

[0010] The beneficial effects of this invention are as follows: The backflush pipe penetrates the filter plate and reaches the back of the filter cloth, achieving precise unclogging; the proportional pressure valve and pulse valve are triggered sequentially by the same PLC controller, forming a segmented closed-loop control. In the early stage of filtration, the PLC controller controls the pressure regulating component to feed at low pressure, and the filter plate operates in a fully expanded state, improving the free water separation efficiency; in the middle stage of filtration, the PLC controller controls the pressure regulating component to feed at high pressure, compressing the filter cake thickness; in the later stage of filtration, the pulse valve of the backflush component is triggered, using a medium-pressure pulsed airflow to reverse-impact the filter cloth, simultaneously achieving filter cloth regeneration and filter cake removal; the pulse backflush actively unclogging, extending the filter cloth life, and is sufficient to remove the filter cake without damaging the filter cloth. Attached Figure Description

[0011] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 For the present utility model Figure 1 Schematic diagram of the structure at point A in the middle;

[0014] Figure 3 This is a cross-sectional view of the connection structure between the filter assembly and the backflush assembly of this utility model.

[0015] Explanation of reference numerals in the attached figures: 1. Fixed bracket; 2. Filter assembly; 201. Filter plate; 202. Filter cloth; 203. Filter chamber; 3. Pressure regulating assembly; 4. Backflush assembly; 401. Backflush pipe; 402. High-pressure air source; 403. Pulse valve; 404. Backflush main pipe; 405. Nozzle; 5. PLC controller; 6. Feed pressure control unit; 601. Feed pump; 602. Feed pipe; 603. Proportional feed valve; 7. Filter plate extrusion unit; 701. Hydraulic cylinder; 702. Hydraulic pump; 703. Main oil circuit; 704. Proportional pressure valve. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0017] like Figures 1-3 As shown, this embodiment provides a filtration device for a segmented filter press, including fixed supports 1 on both sides and a filter assembly 2. The filter assembly 2 consists of multiple filter plates 201 arranged in parallel and filter cloth 202. The filter cloth 202 covers the surface of the filter plates 201 to form a filter chamber 203. The feed end of the filter assembly 2 is provided with a pressure regulating component 3 for inputting material into the filter chamber 203 and providing grading pressure. The pressure regulating component 3 includes a feed pressure control unit 6 and a filter plate squeezing unit 7. The filter assembly 2 is provided with a backflushing component 4. The backflushing component 4 includes a backflushing pipe 401 that penetrates the filter plates 201 and extends to the back of the filter cloth 202. A high-pressure air source 402 is installed on the fixed supports 1. Each filter plate 201 is equipped with a pulse valve 403. The high-pressure air source 402 is connected to the air inlet of the pulse valve 403 through a branch pipe on the backflushing main pipe 404. One end of the backflushing pipe 401 is connected to the air outlet of the pulse valve 403. A PLC control is installed on the fixed supports 1. The filter element 5 and PLC controller 5 are connected to the pressure regulating component 3 and backflushing component 4 via signal connections. The PLC controller 5 is used to control the filtration pressure and backflushing action in stages. The backflushing pipe 401 passes through the filter plate 201 and reaches the back of the filter cloth 202, achieving precise unclogging. The proportional pressure valve 704 and the pulse valve 403 are triggered sequentially by the same PLC controller 5, forming a segmented closed-loop control. In the early stage of filtration, the PLC controller 5 controls the pressure regulating component 3 to feed at a pressure of 0.2-0.5MPa, and the filter plate 201 operates in a fully expanded state, improving the free water separation efficiency. In the middle stage of filtration, the PLC controller 5 controls the pressure regulating component 3 to feed at a pressure of 0.8-1.2MPa, compressing the filter cake thickness. In the later stage of filtration, the pulse valve 403 of the backflushing component 4 is triggered, and a pulse airflow with a pressure of 0.5-0.8MPa is used to reverse-impact the filter cloth 202, simultaneously achieving filter cloth 202 regeneration and filter cake peeling. The pulse backflushing actively unclogging the filter cloth 202, extending its lifespan, and is sufficient to peel off the filter cake without damaging the filter cloth 202.

[0018] The backflush pipe 401 is provided with a fan-shaped nozzle 405 at one end on the back of the filter cloth 202. The opening direction of the nozzle 405 is set perpendicular to the filter cloth 202 to form a wide impact surface. The coverage of the filter cloth 202 is increased, and the pulse airflow generates shear force instead of vertical impact, reducing the risk of damage to the filter cloth 202.

[0019] The filter plate extrusion unit 7 includes a hydraulic cylinder 701 mounted on a fixed bracket 1 for moving all filter plates 201. The filter plate extrusion unit 7 also includes a hydraulic pump 702 mounted on the fixed bracket 1. The outlet of the hydraulic pump 702 is connected to a main oil circuit 703 connected to the hydraulic cylinder 701. A proportional pressure valve 704 is installed on the main oil circuit 703. The proportional pressure valve 704 dynamically adjusts the output oil pressure of the hydraulic pump 702 and controls the mechanical extrusion force of the hydraulic cylinder 701 on the filter plates 201, mechanically extruding the filter cake, forcibly compressing the particle gaps, and reducing the moisture content of the filter cake.

[0020] The feed pressure control unit 6 includes a feed pump 601 mounted on a fixed bracket 1 and a feed pipe 602 connected to the filter chamber 203 via the feed pump 601 outlet. A proportional feed valve 603 is installed on the feed pipe 602. The proportional feed valve 603 adjusts the flow rate and pressure of the feed pump 601 to control the initial filling pressure of the material inside the filter chamber 203, so that the filter plate 201 is fully expanded, increasing the effective filtration area of ​​the filter cloth 202, accelerating the seepage of free water, and improving the separation efficiency.

[0021] Each filter plate 201 is provided with at least three evenly distributed backflushing pipes 401, which evenly cover the back of the filter cloth 202 to eliminate dead corners for cleaning.

[0022] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0023] During operation, the backflushing pipe 401 penetrates the filter plate 201 and reaches the back of the filter cloth 202, achieving precise unclogging. The proportional pressure valve 704 and the pulse valve 403 are triggered sequentially by the same PLC controller 5, forming a segmented closed-loop control. In the early stage of filtration, the PLC controller 5 controls the pressure regulating component 3 to feed at low pressure, and the filter plate 201 operates in a fully expanded state, improving the free water separation efficiency. In the middle stage of filtration, the PLC controller 5 controls the pressure regulating component 3 to feed at high pressure, compressing the filter cake thickness. In the later stage of filtration, the pulse valve 403 of the backflushing component 4 is triggered, and the filter cloth 202 is impacted in reverse with a medium-pressure pulse airflow, simultaneously realizing the regeneration of the filter cloth 202 and the peeling off of the filter cake. The pulse backflushing actively unclogging, extending the life of the filter cloth 202, and is sufficient to peel off the filter cake without damaging the filter cloth 202.

[0024] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A filtration device for a segmented filter press, comprising fixed supports (1) on both sides, characterized in that: It also includes a filter assembly (2), which consists of multiple filter plates (201) arranged in parallel and filter cloth (202). The filter cloth (202) covers the surface of the filter plates (201) to form a filter chamber (203). The feed end of the filter assembly (2) is provided with a pressure regulating assembly (3) for inputting material into the filter chamber (203) and providing grading pressure. The pressure regulating assembly (3) includes a feed pressure control unit (6) and a filter plate squeezing unit (7). The filter assembly (2) is provided with a backflushing assembly (4), which includes components that penetrate the filter plates (201) and extend to the filter cloth (202). The backflush pipe (401) on the back is equipped with a high-pressure air source (402) on the fixed bracket (1). Each filter plate (201) is equipped with a pulse valve (403). The high-pressure air source (402) is connected to the air inlet of the pulse valve (403) through a branch pipe on the backflush main pipe (404). One end of the backflush pipe (401) is connected to the air outlet of the pulse valve (403). A PLC controller (5) is installed on the fixed bracket (1). The PLC controller (5) is connected to the pressure regulating component (3) and the backflush component (4) by signal. The PLC controller (5) is used to control the filtration pressure and backflush action in segments.

2. The filtration device for a segmented filter press according to claim 1, characterized in that: The backflush pipe (401) is provided with a fan-shaped nozzle (405) at one end on the back side of the filter cloth (202), and the opening direction of the nozzle (405) is perpendicular to the filter cloth (202).

3. The filtration device for a segmented filter press according to claim 1, characterized in that: The filter plate extrusion unit (7) includes a hydraulic cylinder (701) mounted on a fixed bracket (1) for moving all the filter plates (201).

4. The filtration device for a segmented filter press according to claim 3, characterized in that: The filter plate extrusion unit (7) also includes a hydraulic pump (702) mounted on a fixed bracket (1). The outlet of the hydraulic pump (702) is connected to a main oil circuit (703) connected to a hydraulic cylinder (701). A proportional pressure valve (704) is installed on the main oil circuit (703).

5. A filtration device for a segmented filter press according to claim 1, characterized in that: The feed pressure control unit (6) includes a feed pump (601) mounted on a fixed bracket (1) and a feed pipe (602) connected to the filter chamber (203) via the feed outlet of the feed pump (601). A proportional feed valve (603) is installed on the feed pipe (602).

6. The filtration device for a segmented filter press according to claim 1, characterized in that: Each of the filter plates (201) is provided with at least three evenly distributed backflush pipes (401).

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