Plate and frame filter

Abstract

The utility model discloses a plate frame filter which comprises a support frame body, a plurality of filter units and a pressing mechanism, the plurality of filter units are arranged on the support frame body at intervals, a filter chamber is formed between every two adjacent filter units, the support frame body is provided with a main feeding channel communicated with each filter chamber, the pressing mechanism is arranged on the support frame body, and the main feeding channel is communicated with the main feeding channel. The main feeding channel is communicated with the filter units and used for pressing the filter units, the chemical feeding channel is communicated with the main feeding channel and used for conveying chemicals for promoting filter cake forming to all the filter cavities, and the gas feeding channel is communicated with the main feeding channel and used for conveying gas to all the filter cavities so as to promote filter cake drying and forming. A filter cake receiving tank used for receiving filter cakes is arranged on the supporting frame body, and a spiral conveyor is further arranged in the filter cake receiving tank; the device has the advantages of improving the filter cake forming efficiency, reducing the water content, and reducing the equipment maintenance cost and the labor intensity.

Description

Technical Field

[0001] The utility model relates to a filter, in particular to a plate-frame filter. Background Art

[0002] As a highly efficient solid-liquid separation equipment, the plate and frame filter is widely used in many industrial fields such as chemical industry, pharmaceutical industry, environmental protection, metallurgy, food, etc. The device can effectively treat liquids with high suspended solids content, intercept solid particles to form filter cakes, and produce clarified filtrate to achieve the purpose of solid-liquid separation. Especially in the process of sludge dewatering, industrial wastewater treatment and product refining, the plate and frame filter has become an indispensable key equipment due to its simple structure, strong adaptability and high separation efficiency. It is of great significance to ensure production safety, improve product quality and reduce environmental pollution.

[0003] The traditional plate and frame filter is mainly composed of filter plates, filter frames, filter cloths and clamping devices. Its working principle is to pump the suspension to be filtered into each filter chamber through the feed channel. Under the action of pressure, the liquid passes through the filter cloth to form filtrate and is discharged through the drainage channel on the filter plate, while the solid particles are trapped on the surface of the filter cloth to form filter cakes. When the filter cake accumulates to a certain thickness, stop the filtering operation, release the clamping device, separate the filter plate and filter frame, take out the formed filter cake, and complete a filtering cycle.

[0004] However, the traditional plate and frame filter has the following problems in actual operation: due to the lack of effective water quality adjustment means, when the inlet water quality fluctuates greatly, the quality of the filter cake formed varies significantly. These problems are more prominent when dealing with suspensions with strong viscosity or high water content. The filter cake often adheres to the surface of the filter cloth and is difficult to fall off automatically. Manual intervention or mechanical vibration is required to assist in removal, which greatly reduces the filtration efficiency and increases the equipment maintenance cost and labor intensity. In addition, the moisture content of the treated filter cake is usually high, which is not conducive to subsequent sludge treatment and disposal, and increases transportation and treatment costs.

[0005] In view of the above problems, it is urgent to develop a new type of plate and frame filter that can effectively solve the problems of difficult filter cake shedding, high water content, low filtration efficiency, etc., to achieve good forming, drying and automatic shedding of filter cake in the sewage treatment process, improve equipment operation efficiency and reduce operation costs. Utility Model Content

[0006] The utility model aims to provide a plate-frame filter, which can improve the filter cake forming efficiency and reduce the water content, thereby reducing the equipment maintenance cost and labor intensity.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a plate and frame filter, comprising a supporting frame, a plurality of filter units and a pressing mechanism, wherein the plurality of filter units are arranged on the supporting frame at intervals, and filter chambers are formed between adjacent filter units, the supporting frame is provided with a main feed channel connected to each of the filter chambers, the pressing mechanism is arranged on the supporting frame and is used to press the plurality of filter units, and also includes a drug adding channel and an air adding channel, the drug adding channel is connected to the main feed channel, and is used to convey a drug that promotes filter cake formation to each of the filter chambers, the air adding channel is connected to the main feed channel, and is used to convey gas to each of the filter chambers to promote filter cake drying and forming, the supporting frame is provided with a filter cake receiving groove for receiving filter cakes, a screw conveyor is also provided in the filter cake receiving groove, a drainage channel is also provided on one side of each filter unit, and a liquid collecting groove for collecting filtrate discharged from the drainage channel is fixed on one side of the supporting frame.

[0008] Preferably, the plate and frame filter also includes a four-way pipe, a first interface of the four-way pipe is connected to the main feed channel, a second interface of the four-way pipe is connected to the drug addition channel, a third interface of the four-way pipe is connected to the gas addition channel, and a fourth interface of the four-way pipe is used to connect to an external liquid inlet pipe.

[0009] Preferably, a first flange is provided on the main feed channel, and the first flange is connected to the first interface of the four-way pipe. A second flange is provided on the drug adding channel, and the second flange is connected to the second interface of the four-way pipe. A third flange is provided on the gas adding channel, and the third flange is connected to the third interface of the four-way pipe. A fourth flange is provided on the fourth interface of the four-way pipe, and the fourth flange is used to be connected to an external liquid inlet pipe.

[0010] Preferably, a dosing valve is provided on the dosing channel, and the dosing valve is used to control the opening and closing of the dosing channel. A gas adding valve is provided on the gas adding channel, and the gas adding valve is used to control the opening and closing of the gas adding channel. A main feed valve is provided on the main feed channel, and the main feed valve is used to control the opening and closing of the main feed channel.

[0011] Preferably, the support frame includes a first end plate, a second end plate, four columns and two support rails, the four columns are distributed in a rectangular shape, each of the support rails is fixed between two columns located on the same side, and the two support rails are distributed horizontally and parallel, the first end plate is fixed between the two columns at one end, the second end plate is fixed between the two columns at the other end, and the filter cake receiving groove is connected between the four columns and is located below the filter unit.

[0012] Preferably, each of the filter units includes a filter plate and filter cloths arranged on both sides of the filter plate, the filter plate is a square plate structure, a surface of which is provided with a uniformly distributed microporous array, a through hole connected to the main feed channel is opened at the center, and the surface of the filter plate is also provided with a plurality of supporting bosses in contact with the filter cloth, and the supporting bosses are uniformly distributed around the through hole.

[0013] Preferably, support ears are fixed on both sides of each filter plate, and the lower end of the support ear is provided with a bearing that is in sliding contact with the support guide rail.

[0014] Preferably, the clamping mechanism comprises a hydraulic cylinder and a clamping plate, the hydraulic cylinder is fixed on the second end plate, and the piston rod of the hydraulic cylinder is fixed to the clamping plate.

[0015] Preferably, the plate and frame filter further comprises a dosing system, which comprises a drug storage tank and a dosing pump, wherein the inlet of the dosing pump is connected to the drug storage tank, and the outlet of the dosing pump is connected to the dosing channel via a dosing pipeline.

[0016] Preferably, the plate and frame filter further comprises an air filling system, which comprises an air source device and a booster pump, wherein the inlet of the booster pump is connected to the air source device, and the outlet of the booster pump is connected to the air filling channel via a gas pipeline.

[0017] Compared with the prior art, the utility model has the advantages that: the device significantly improves the filtration efficiency and filter cake quality through the three-channel system design. During operation, the suspension to be filtered enters each filter chamber through the main feed channel, and at the same time, the agent that promotes the formation of the filter cake is transported through the drug-adding channel connected to the main feed channel, accelerating the solid-liquid separation process and improving the filter cake structure, and then the gas is transported to the filter chamber through the gas-adding channel to promote the drying and forming of the filter cake, effectively reducing the moisture content of the filter cake; the clamping mechanism ensures that the filter unit fits tightly, prevents leakage, and improves the filtration accuracy; the liquid part is discharged through the drainage channel set on one side of each filter unit, and is collected in the liquid collecting tank fixed on one side of the support frame; and the filter cake formed by the solid part falls into the filter cake receiving tank set on the support frame, and is automatically transported out of the system by the built-in screw conveyor to achieve continuous processing.

[0018] This structural design not only solves the problems of filter cake being difficult to automatically fall off, high moisture content and low filtration efficiency in traditional plate and frame filters, but also significantly improves the dehydration effect of the filter cake through reagent addition and gas-assisted technology. At the same time, the automated filter cake collection and conveying system greatly reduces the need for manual intervention and improves the continuous operation capability and overall processing efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0021] Figure 2 This is the waterway principle diagram of the utility model;

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the filter unit in the utility model;

[0023] Figure 4 This is the front view of the filter plate in the utility model;

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the pressing mechanism in the utility model;

[0025] In the figure, 1, support frame; 2, filter unit; 3, clamping mechanism; 4, main feed channel; 5, dosing channel; 6, gas channel; 7, filter cake receiving tank; 8, screw conveyor; 9, drainage channel; 10, liquid collecting tank; 11, four-way pipe; 12, first interface; 13, second interface; 14, third interface; 15, fourth interface; 16, first flange; 17, second flange; 18, third flange; 19, fourth flange; 20, dosing valve; 21 , gas filling valve; 22, main feed valve; 23, first end plate; 24, second end plate; 25, column; 26, support rail; 27, filter plate; 28, filter cloth; 29, microporous array; 30, through hole; 31, support boss; 32, support ear; 33, bearing; 34, hydraulic cylinder; 35, clamping plate; 36, piston rod; 37, drug storage tank; 38, dosing pump; 39, dosing pipeline; 40, air source device; 41, booster pump; 42, gas pipeline. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] Embodiment 1: Figure 1-Figure 5As shown, a plate and frame filter comprises a support frame 1, a plurality of filter units 2 and a pressing mechanism 3, wherein the plurality of filter units 2 are arranged on the support frame 1 at intervals, and filter chambers are formed between adjacent filter units 2, and a main feed channel 4 connected to each filter chamber is provided on the support frame 1, and the pressing mechanism 3 is arranged on the support frame 1 and is used to press the plurality of filter units 2, and further comprises a dosing channel 5 and a gas adding channel 6, the dosing channel 5 is connected to the main feed channel 4, and is used to convey a medicament to each filter chamber to promote filter cake formation, the gas adding channel 6 is connected to the main feed channel 4, and is used to convey gas to each filter chamber to promote filter cake drying and formation, a filter cake receiving groove 7 for receiving filter cake is provided on the support frame 1, and a screw conveyor 8 is also provided in the filter cake receiving groove 7, a drainage channel 9 is also provided on one side of each filter unit 2, and a liquid collecting tank 10 for collecting filtrate discharged from the drainage channel 9 is fixed on one side of the support frame 1.

[0028] The working process of the plate and frame filter begins with the input stage of the suspension to be treated. First, the suspension enters the main feed channel 4 through the external feed pipe, and then is diverted to each filter chamber. At this time, the pressing mechanism 3 has pressed the multiple filter units 2 to ensure that the filter chambers are well sealed to prevent leakage and provide a stable filtering pressure. When the suspension enters the filter chamber, under the action of pressure, the liquid part passes through the filter cloth 28 covering both sides of the filter unit 2, while the solid particles are intercepted by the filter cloth 28, and the initial filter layer begins to form on the surface of the filter cloth 28.

[0029] As the filtration process proceeds, agents such as flocculants or filter aids that promote filter cake formation can be added to the main feed channel 4 through the dosing channel 5. These agents are fully mixed with the suspension and enter the filtration chamber, causing the tiny particles in the suspension to aggregate into larger particles, improving the pore structure of the filter cake, and enhancing its permeability, thereby accelerating the solid-liquid separation rate and forming a filter cake layer with a more stable structure. This stage effectively solves the problems of slow filtration rate and frequent blockage caused by fine particles in traditional filters.

[0030] When the filter cake layer is basically formed, the gas supply channel 6 starts to transport gas (usually compressed air or nitrogen, etc.) to the main feed channel 4. The gas and liquid are mixed and enter the filter chamber to penetrate the formed filter cake layer. The introduction of gas creates a tiny air flow channel, which on the one hand accelerates the discharge of residual liquid, and on the other hand breaks the capillary action in the filter cake, significantly reducing the moisture content of the filter cake. At the same time, the gas flow can also apply slight vibration to the filter cake, which helps to loosen the filter cake that is excessively adhered to the surface of the filter cloth 28, creating conditions for the subsequent filter cake to fall off.

[0031] The filtrate generated during the filtration process is discharged through the liquid discharge channel 9 provided on one side of each filtration unit 2 and converges into the liquid collection tank 10 fixed on one side of the support frame 1 for subsequent treatment or recycling. When the filtration cycle ends, the pressing mechanism 3 releases the pressure, and the pressure between the filtration units 2 is relieved. Under the combined influence of gravity and the previous gas assistance, the formed filter cake automatically falls off the surface of the filter cloth 28 and into the filter cake receiving tank 7 provided below the support frame 1.

[0032] Immediately, the screw conveyor 8 in the filter cake receiving tank 7 starts, conveying the collected filter cake along the tank body to the discharge end to achieve continuous discharge of the filter cake. Due to the addition of medicine and gas treatment, the filter cake falling into the filter cake receiving tank 7 already has a lower moisture content and good structural integrity, facilitating subsequent treatment and transportation. During the whole process, the valves on each channel can be precisely adjusted according to different material characteristics and treatment requirements to achieve precise control of the filtration process.

[0033] Example 2: As Figure 1-Figure 5 shown, different from Example 1, the plate and frame filter further includes a four-way pipe 11. The first interface 12 of the four-way pipe 11 is connected to the main feed channel 4, the second interface 13 of the four-way pipe 11 is connected to the medicine adding channel 5, the third interface 14 of the four-way pipe 11 is connected to the gas adding channel 6, and the fourth interface 15 of the four-way pipe 11 is used to connect to an external liquid inlet pipe.

[0034] The four-way pipe 11 is designed to integrate four functional interfaces into a compact component. Among them, the first interface 12 is connected to the main feed channel 4 to ensure that the suspension to be filtered can be smoothly transported to each filtration chamber; the second interface 13 is connected to the medicine adding channel 5 to enable the precise addition of the medicine promoting the formation of the filter cake and full mixing with the feed liquid; the third interface 14 is connected to the gas adding channel 6 to allow gas to be introduced into the system at an appropriate time to promote the drying and forming of the filter cake; the fourth interface 15 is specifically used to connect to an external liquid inlet pipe to achieve a standardized connection with an external feeding system.

[0035] This design of the four-way pipe 11 not only simplifies the structure of the pipeline system, reduces the connection points and possible leakage risks, but also facilitates installation and maintenance. More importantly, through this centralized connection point, operators can precisely control and adjust the input of three different media at the same position to achieve the proportional mixing of materials, medicines, and gases as needed, and flexibly adjust the process parameters according to different filtration conditions. In addition, the design of the four-way pipe 11 also has strong adaptability, allowing different types of medicines and gases to be replaced or added in the future according to needs to meet diverse filtration requirements and improve the versatility and expandability of the equipment.

[0036] In this embodiment, a first flange 16 is provided on the main feed channel 4, and the first flange 16 is connected to the first interface 12 of the four-way pipe 11. A second flange 17 is provided on the dosing channel 5, and the second flange 17 is connected to the second interface 13 of the four-way pipe 11. A third flange 18 is provided on the gas adding channel 6, and the third flange 18 is connected to the third interface 14 of the four-way pipe 11. A fourth flange 19 is provided on the fourth interface 15 of the four-way pipe 11, and the fourth flange 19 is used to be connected to an external liquid inlet pipe.

[0037] In the above structure, the first flange 16 arranged on the main feed channel 4 is connected to the first interface 12 of the four-way pipe 11, ensuring that the suspension to be filtered can be transmitted from the four-way pipe 11 to the main feed channel 4 without leakage and with high efficiency; the second flange 17 on the dosing channel 5 is connected to the second interface 13 of the four-way pipe 11, providing a stable connection channel for the delivery of the medicine; the third flange 18 on the gas adding channel 6 is connected to the third interface 14 of the four-way pipe 11, ensuring that the gas can be safely delivered under the specified pressure; the fourth flange 19 arranged on the fourth interface 15 of the four-way pipe 11 is specifically used for connecting with the external liquid inlet pipeline, providing a standardized external docking interface.

[0038] This all-round flange connection design has multiple advantages: first, the flange connection has excellent sealing performance and can withstand liquid and gas transmission under high-pressure environment without leakage. Second, the standardized flange interface facilitates the installation, disassembly and maintenance of the equipment, and operators can easily clean the pipeline, replace components and overhaul the system. Third, the flange connection provides structural flexibility, allowing components of different materials or specifications to be quickly replaced under different working conditions to meet diverse filtration needs. Fourth, the connection between the flanges is stable and reliable, which can effectively resist the pressure fluctuations and mechanical vibrations that may occur during the filtration process, thereby extending the service life of the equipment.

[0039] In this embodiment, a dosing valve 20 is provided on the dosing channel 5, and the dosing valve 20 is used to control the opening and closing of the dosing channel 5. A gas filling valve 21 is provided on the gas filling channel 6, and the gas filling valve 21 is used to control the opening and closing of the gas filling channel 6. A main feed valve 22 is provided on the main feed channel 4, and the main feed valve 22 is used to control the opening and closing of the main feed channel 4.

[0040] The plate and frame filter has built a reliable fluid control system by setting independent control valves on three key channels, which greatly improves the controllability and flexibility of the filtration process. The main feed valve 22 on the main feed channel 4 can accurately control the input amount and flow rate of the suspension, providing basic flow regulation capability for the filtration process. The dosing valve 20 on the dosing channel 5 enables the operator to accurately control the timing, amount and rate of adding the agent that promotes the formation of the filter cake according to different material characteristics and processing requirements, so as to achieve on-demand adjustment of the flocculation or filtration process. The gas valve 21 on the gas channel 6 is specifically responsible for the opening and closing of gas delivery, so that the gas-assisted drying function can intervene at the best time to improve the dehydration effect of the filter cake.

[0041] This three-valve independent control design enables the filtration system to achieve multi-stage, step-by-step precise operation, adapting to the changing needs of different material characteristics and processing stages. The coordinated work between the valves enables the execution of complex process flows, such as adding materials first and then adding drugs, or alternating between adding drugs and adding gas. In equipment maintenance or emergency situations, the system can be isolated by closing specific valves, greatly improving operational safety.

[0042] Embodiment 3: Figure 1-Figure 5 As shown, different from the second embodiment, the support frame 1 includes a first end plate 23, a second end plate 24, four columns 25 and two support rails 26, the four columns 25 are distributed in a rectangular shape, each support rail 26 is fixed between two columns 25 located on the same side, and the two support rails 26 are distributed horizontally and parallel, the first end plate 23 is fixed between the two columns 25 at one end, the second end plate 24 is fixed between the two columns 25 at the other end, and the filter cake receiving groove 7 is connected between the four columns 25 and is located below the filter unit 2.

[0043] The four columns 25 are arranged in a rectangular shape, forming the basic support frame of the entire system, ensuring that the equipment has sufficient bearing capacity and stability; two horizontally parallel support rails 26 are fixed between the two columns 25 on the same side, providing precise positioning and sliding tracks for the filter unit 2, so that the filter unit 2 can be accurately aligned and convenient for installation and disassembly; the first end plate 23 and the second end plate 24 are respectively fixed between the columns 25 at both ends of the frame, forming a closed boundary of the entire filtration system, and are also important fulcrums for the clamping mechanism 3 to apply force, ensuring that each filter unit 2 can maintain a tight fit during the filtration process; the filter cake receiving groove 7 is connected between the four columns 25 and is located directly below the filter unit 2. The filter cake that falls off from the filter unit 2 is directly collected by the principle of gravity, and the initial collection of the filter cake can be achieved without the need for an additional conveying device.

[0044] This integrated three-dimensional structural design makes the entire filtration system occupy a small area and has high space utilization. The position relationship between the various components of the equipment is fixed and reasonable, which reduces the transmission distance of materials in the system and improves the filtration efficiency.

[0045] In this embodiment, each filter unit 2 includes a filter plate 27 and filter cloth 28 arranged on both sides of the filter plate 27. The filter plate 27 is a square plate structure, and a uniformly distributed microporous array 29 is provided on its surface. A through hole 30 connected to the main feed channel 4 is opened at the center. The surface of the filter plate 27 is also provided with a plurality of supporting bosses 31 in contact with the filter cloth 28, and the supporting bosses 31 are uniformly distributed around the through hole 30.

[0046] The filter plate 27 adopts a square plate structure, and the surface is designed with an evenly distributed micropore array 29. These micropores are the basic channels for the filtrate to pass through, ensuring the maximization of the filtration area and the balance of the filtration flow rate; the through hole 30 opened at the center of the filter plate 27 is connected to the main feed channel 4, so that the suspension can directly enter the filtration chamber to achieve uniform distribution of the material; multiple supporting bosses 31 on the surface of the filter plate 27 are evenly distributed around the central through hole 30, and these bosses are in direct contact with the filter cloth 28, forming a key supporting structure. When pressure is applied during the filtration process, the supporting bosses 31 prevent the filter cloth 28 from completely fitting on the surface of the filter plate 27, and reserve the necessary fluid channel space between the filter cloth 28 and the filter plate 27, so that the filtrate can flow smoothly to the micropores and be discharged. This design avoids the problem of the filter cloth 28 clogging the micropores due to excessive pressure, thereby extending the filtration cycle. At the same time, the uniform distribution of the support bosses 31 ensures the uniform transmission of pressure on the entire surface of the filter plate 27, reduces the local stress of the filter cloth 28, and extends the service life of the filter cloth 28. In addition, the filter cloth 28 can be selected from suitable materials and pore sizes according to different filtration requirements, thereby enhancing the adaptability of the system.

[0047] In this embodiment, support ears 32 are fixed to both sides of each filter plate 27 , and a bearing 33 that is in sliding contact with the support guide rail 26 is disposed at the lower end of the support ear 32 .

[0048] The above design enables the filter plate 27 to be stably suspended on the support rail 26, and the filter plate 27 can slide smoothly through the bearing 33, which greatly reduces the friction resistance and operation difficulty when the filter plate 27 moves. During the installation and removal of the plate and frame filter, the operator only needs to push the filter plate 27 lightly, and the bearing 33 can drive the entire filter plate 27 to move smoothly along the rail, without lifting the heavy filter plate 27, which significantly reduces the labor intensity.

[0049] In this embodiment, the pressing mechanism 3 includes a hydraulic cylinder 34 and a pressing plate 35 . The hydraulic cylinder 34 is fixed on the second end plate 24 , and a piston rod 36 of the hydraulic cylinder 34 is fixed to the pressing plate 35 .

[0050] The clamping mechanism 3 of the plate-and-frame filter adopts a hydraulic drive mode, which is composed of a hydraulic cylinder 34 and a clamping plate 35, forming an efficient and reliable pressure control system. The hydraulic cylinder 34 is fixed on the second end plate 24, and its piston rod 36 is fixed to the clamping plate 35, forming a direct path for force transmission. When the filtering operation starts, the hydraulic system provides pressure to the hydraulic cylinder 34, drives the piston rod 36 to extend, pushes the clamping plate 35 to move forward, and applies uniform and strong pressure to the filter unit 2, so that a tightly fitting sealing environment is formed between adjacent filter units 2. This hydraulic drive design can generate pressure far exceeding the manual mechanical clamping method, meet the process requirements of high-pressure filtration, and is particularly suitable for processing difficult-to-filter materials or application scenarios requiring high dehydration. The hydraulic system can accurately control the pressure. The operator only needs to adjust the pressure parameters of the hydraulic pump to easily achieve the adjustment of different pressure requirements without heavy physical labor. The clamping process is stable and smooth, avoiding the uneven pressure and sudden changes that may occur in mechanical screw-type clamping, ensuring the consistency of pressure distribution in the filter chamber, and improving the filtering effect.

[0051] In addition, the combination of the hydraulic cylinder 34 and the clamping plate 35 has the characteristic of rapid response, which can quickly release pressure in an emergency, thereby improving the safety of the equipment. The hydraulic system can also be integrated with the automatic control device to realize programmed control and remote operation of pressure, which greatly improves the automation level and operational convenience of the equipment, reduces the need for manual intervention, and creates conditions for continuous and intelligent production.

[0052] In this embodiment, the plate and frame filter also includes a dosing system, which includes a drug storage tank 37 and a dosing pump 38 . The inlet of the dosing pump 38 is connected to the drug storage tank 37 , and the outlet of the dosing pump 38 is connected to the dosing channel 5 through a dosing pipeline 39 .

[0053] The reagent storage tank 37 is used to store special reagents for promoting the formation of filter cakes. Suitable flocculants, filter aids or modifiers can be selected according to the characteristics of different filter materials. The inlet of the dosing pump 38 is directly connected to the reagent storage tank 37, and the outlet is connected to the dosing channel 5 through a special dosing pipeline 39, thus constructing a complete conveying passage from the reagent storage to the filter chamber. When working, the dosing pump 38 extracts the reagent from the storage tank and pumps it to the dosing channel 5 at a controllable flow rate. Then the reagent enters the main feed channel 4 and is fully mixed with the suspension to be filtered, and finally reaches the filter chamber to participate in the filter cake formation process.

[0054] This design makes the drug addition process highly controllable. The operator can accurately control the amount and rate of drug addition by adjusting the operating parameters of the dosing pump 38, thereby achieving economical and efficient use of the drug. The separation design of the dosing system and the main filtration system allows the replenishment or replacement of the drug without interrupting the filtration operation, thereby improving the continuous operation capacity of the equipment. At the same time, the closed drug delivery link avoids the leakage of harmful drugs and direct contact with operators, thereby improving operational safety.

[0055] In this embodiment, the plate and frame filter also includes a gas filling system, which includes a gas source device 40 and a booster pump 41. The inlet of the booster pump 41 is connected to the gas source device 40, and the outlet of the booster pump 41 is connected to the gas filling channel 6 through a gas pipeline 42.

[0056] The gas source device 40, as the gas source of the system, can provide dry compressed air or specific functional gas, such as nitrogen, etc. The booster pump 41 is connected to the gas source device 40 through its inlet, further pressurizes the gas of the original gas source, and then delivers the high-pressure gas to the gas supply channel 6 through its outlet and the dedicated gas pipeline 42, and finally enters the main feed channel 4 to mix with the suspension and reach the filter chamber. During the filtration process, the gas penetrates the formed filter cake layer, generates a tiny air flow channel, destroys the capillary action in the filter cake, accelerates the discharge of residual liquid, and significantly reduces the moisture content of the filter cake. At the same time, the air flow will also cause slight vibration to the filter cake, which helps to loosen the adhesion between the filter cake and the filter cloth 28, creating conditions for the filter cake to automatically fall off. This gas supply system design allows the gas delivery process to be precisely controlled. The operator can control the gas pressure and flow by adjusting the operating parameters of the booster pump 41 to meet different material characteristics and processing requirements.

[0057] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A plate-and-frame filter, comprising a support frame, a plurality of filter units and a pressing mechanism, wherein the plurality of filter units are arranged on the support frame at intervals, filter chambers are formed between adjacent filter units, the support frame is provided with a main feed channel connected to each of the filter chambers, the pressing mechanism is arranged on the support frame and is used to press the plurality of filter units, characterized in that: It also includes a drug adding channel and a gas adding channel. The drug adding channel is connected with the main feed channel and is used to convey a drug that promotes filter cake formation to each of the filter chambers. The gas adding channel is connected with the main feed channel and is used to convey gas to each of the filter chambers to promote filter cake drying and formation. A filter cake receiving groove for receiving filter cakes is provided on the support frame, and a screw conveyor is also provided in the filter cake receiving groove. A drainage channel is also provided on one side of each filter unit, and a liquid collecting groove for collecting filtrate discharged from the drainage channel is fixed on one side of the support frame.

2. A plate-and-frame filter according to claim 1, characterized in that: The plate and frame filter also includes a four-way pipe, a first interface of the four-way pipe is connected to the main feed channel, a second interface of the four-way pipe is connected to the drug addition channel, a third interface of the four-way pipe is connected to the gas addition channel, and a fourth interface of the four-way pipe is used to connect to an external liquid inlet pipeline.

3. A plate-and-frame filter according to claim 2, characterized in that: A first flange is provided on the main feed channel, and the first flange is connected to the first interface of the four-way pipe. A second flange is provided on the drug adding channel, and the second flange is connected to the second interface of the four-way pipe. A third flange is provided on the gas adding channel, and the third flange is connected to the third interface of the four-way pipe. A fourth flange is provided on the fourth interface of the four-way pipe, and the fourth flange is used to be connected to an external liquid inlet pipe.

4. A plate-and-frame filter according to claim 2, characterized in that: The dosing channel is provided with a dosing valve, and the dosing valve is used to control the opening and closing of the dosing channel. The gas adding channel is provided with a gas adding valve, and the gas adding valve is used to control the opening and closing of the gas adding channel. The main feed channel is provided with a main feed valve, and the main feed valve is used to control the opening and closing of the main feed channel.

5. A plate-and-frame filter according to claim 1, characterized in that: The support frame includes a first end plate, a second end plate, four columns and two support rails, the four columns are distributed in a rectangular shape, each of the support rails is fixed between two columns located on the same side, and the two support rails are distributed horizontally and parallel, the first end plate is fixed between the two columns at one end, the second end plate is fixed between the two columns at the other end, and the filter cake receiving groove is connected between the four columns and is located below the filter unit.

6. A plate-and-frame filter according to claim 5, characterized in that: Each of the filter units includes a filter plate and filter cloths arranged on both sides of the filter plate. The filter plate is a square plate structure, and a uniformly distributed microporous array is provided on its surface. A through hole connected to the main feed channel is opened at the center. The filter plate surface is also provided with a plurality of supporting bosses in contact with the filter cloth, and the supporting bosses are uniformly distributed around the through hole.

7. A plate-and-frame filter according to claim 6, characterized in that: Supporting ears are fixed on both sides of each filter plate, and bearings that are in sliding contact with the supporting guide rails are arranged at the lower ends of the supporting ears.

8. A plate-and-frame filter according to claim 5, characterized in that: The clamping mechanism comprises a hydraulic cylinder and a clamping plate. The hydraulic cylinder is fixed on the second end plate, and a piston rod of the hydraulic cylinder is fixed to the clamping plate.

9. A plate-and-frame filter according to claim 1, characterized in that: The plate and frame filter also includes a dosing system, which includes a medicine storage tank and a dosing pump. The inlet of the dosing pump is connected to the medicine storage tank, and the outlet of the dosing pump is connected to the dosing channel through a dosing pipeline.

10. The plate-and-frame filter according to claim 1, characterized in that: The plate-and-frame filter further comprises an air filling system, which comprises an air source device and a booster pump, wherein the inlet of the booster pump is connected to the air source device, and the outlet of the booster pump is connected to the air filling channel via a gas pipeline.

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