Filter cloth deep cleaning device and method for filter cloth walking type full-automatic filter press

Abstract

The invention discloses a filter cloth walking type full-automatic filter press filter cloth deep cleaning device and method, and relates to the technical field of filter press filter cloth cleaning, the filter cloth walking type full-automatic filter press filter cloth deep cleaning device comprises a filter press main body and a plurality of filter plates mounted on the filter press main body, each filter plate is provided with an underneath type flushing pipe, each flushing pipe is provided with a plurality of nozzles, each filter plate is provided with filter cloth, and the nozzles are arranged on the filter cloth. The filter cloth is driven by a filter cloth motor arranged on the filter plate to walk; a water collecting tank is arranged on the cleaning frame in a lifting mode through a lifting device, an ultrasonic generating device and a heating device are arranged in the water collecting tank, and a conveyor is arranged at the bottom of the water collecting tank; parallel pull rod mechanisms are arranged at the bottoms of the filter plates, are connected with the flushing pipes on the plurality of filter plates and are used for driving the plurality of flushing pipes to rotate. Therefore, the problems existing in the filter cloth of the existing plate-and-frame filter press are solved, and blockage and replacement caused by insufficient cleaning strength of filter cloth consumables of the plate-and-frame filter press are avoided, so that the actual service life of the filter cloth is prolonged.

Description

Technical Field

[0001] This application relates to the field of filter cloth cleaning technology for filter presses, and in particular to a fully automatic filter cloth deep cleaning device and method for filter cloth walking type filter press. Background Technology

[0002] Diaphragm plate and frame filter presses, which use filter cloths made of materials such as polypropylene, polyester, or nylon as retention filters, are widely used in processes such as deep dewatering of municipal sludge, deep dewatering of industrial sludge, and filtration of intermediate materials in chemical production. Because they employ a physical retention filtration method, the non-uniformly distributed pore diameter on the filter cloth, using plain weave, twill weave, or satin weave, must be much smaller than the equivalent diameter of the filtered material to ensure efficient material retention and separation. As the core retention filtration component, the filter cloth is prone to clogging due to prolonged exposure to filtration, retention, and secondary high-pressure pressing, resulting in a significant reduction in filtration efficiency and a substantial decrease in its actual service life.

[0003] Due to efficiency issues, traditional diaphragm plate and frame filter presses only wash the filter cloth after the daily filtration and pressing operations. The washing time for a single batch of filter cloth is generally 2-3 hours, and the filter cloth can only be washed with high-pressure water provided by the machine's own washing cart. As a result, the filter cloth is very prone to clogging, and its service life is only about 800 batches. At this point, although there is no physical damage to the filter cloth, the filter pores are completely blocked by the filtered material or crystals formed by precipitates in the filtered material due to untimely and incomplete cleaning, making it impossible to effectively perform solid-liquid separation and requiring replacement.

[0004] Although the filter cloth walking fully automatic filter press has improved the filter cloth washing device compared to the traditional diaphragm plate and frame filter press, enabling timely washing after each batch of filtration, the filter cloth movement is driven by a motor through transmission gears. The filter cloth has a greater tensile strength than the fixed filter cloth of the traditional diaphragm plate and frame filter press. Therefore, when selecting filter cloth, the requirement for the basis weight per unit area is greater, generally 3 to 4 times that of the filter cloth of the traditional diaphragm plate and frame filter press. The greater weaving density also results in smaller filter cloth pore size, making it more prone to clogging.

[0005] To address this, an ultrasonic cleaning device and method for filter cloths in fully automatic filter presses with walking filter cloths were developed. This device can selectively perform ultrasonic cleaning on the filter cloths of fully automatic filter presses with walking filter cloths, minimizing the clogging process of the filter cloths, extending their service life, promoting the greening of plate and frame filter presses, and reducing the daily operating costs of plate and frame filter presses. Summary of the Invention

[0006] To address the existing problems with filter cloths in plate and frame filter presses and avoid clogging and replacement due to insufficient cleaning intensity of filter cloth consumables, thereby extending the actual service life of the filter cloth, this application provides a fully automatic filter cloth deep cleaning device and method for filter cloth walking type.

[0007] The technical solution provided in this application for a filter cloth walking fully automatic filter press filter cloth deep cleaning device and method adopts the following technical solution.

[0008] A fully automatic filter press filter cloth deep cleaning device with filter cloth walking type includes a filter press body and multiple filter plates installed on the filter press body. The filter plates are provided with a bottom flushing pipe and a number of nozzles are installed on the flushing pipe. The filter plates are provided with filter cloth. The device also includes: the filter cloth is driven to walk by a filter cloth motor installed on the filter plate. A cleaning rack is provided, on which a water collection tank is raised and lowered via a lifting device. An ultrasonic generator and a heating device are installed inside the water collection tank, and a conveyor is installed at the bottom of the water collection tank. A parallel tie rod mechanism is provided at the bottom of the filter plate, and the parallel tie rod mechanism is connected to the rinsing pipes on several filter plates to drive the rinsing pipes to rotate.

[0009] By adopting the above technical solution, the filter cloth motor drives the filter cloth to move, and at the same time, the flushing pipe and nozzle can flush the filter cloth, realizing the initial cleaning of the filter cloth; by lifting the water collection tank through the lifting device, the filter cloth can be immersed in the water collection tank. By driving the flushing pipe to rotate through the parallel tie rod mechanism, the spray angle of the nozzle can be changed. Then, through the action of the ultrasonic generator and heating device, the cleaning water in the water collection tank is heated and ultrasonically cleaned, realizing the deep cleaning of the filter cloth. In summary, the deep cleaning of the filter cloth is achieved.

[0010] Optionally, the lifting device includes an electric cylinder, which is mounted on the cleaning frame and drives the water collection tank to be raised and lowered.

[0011] By adopting the above technical solutions, electric cylinder technology is mature, easy to control, and stable and reliable.

[0012] Optionally, ultrasonic generators are installed on both sides of the water collection tank, and the heating device is installed at the bottom of the water collection tank.

[0013] By adopting the above technical solution, the ultrasonic generator utilizes the cavitation effect of ultrasound to generate localized high-pressure shock waves through the formation and bursting of microbubbles in the liquid. This removes solid particles and adhering substances from the gaps between filter cloth fibers. Compared to high-pressure water washing, the cleaning is more thorough and causes less damage to the filter cloth fibers. It can effectively alleviate filter cloth clogging problems and extend the service life of the filter cloth. The advantages of ultrasonic cleaning are good cleaning effect, simple operation, and the ability to remix the cleaning water. By setting up a heating device and controlling the temperature, the cleaning effect of ultrasound and chemicals can be further enhanced.

[0014] Optionally, the conveyor includes a chain plate conveyor, and the chain plate of the chain plate conveyor has a plurality of mesh openings.

[0015] By adopting the above technical solution and setting up a chain plate conveyor, the conveying of sludge cake after the filter press can be met. The mesh openings on the chain plate facilitate liquid drop and prevent water accumulation.

[0016] Optionally, a drain pipe is provided at the bottom of the water collection tank, and a drain valve is provided on the drain pipe.

[0017] By adopting the above technical solution, the installation of the drain pipe facilitates the discharge of liquid from the water collection tank, and the installation of the drain valve facilitates the storage and drainage of water in the water collection tank.

[0018] Optionally, it also includes a chemical dosing device for adding chemicals into the water collection tank.

[0019] By adopting the above technical solution and setting up a reagent dosing device, the addition of reagents is beneficial to providing a cleaning effect on the filter cloth.

[0020] Optionally, the parallel tie rod mechanism includes a plurality of tie rods arranged along the filter plate direction, with the ends of the tie rods interlocked, the tie rods spaced apart having the same diameter, and the ends of the plurality of flushing pipes being provided with connecting rods, the plurality of connecting rods being hinged to the tie rods.

[0021] By adopting the above technical solution and setting up a parallel tie rod mechanism, the ends of several tie rods are interlocked, which facilitates the opening and closing of multiple filter plates. When the filter plates are closed, several tie rods are closed together. When the filter plates are opened, the tie rods can also be pulled open at the same time. Through the connecting rod, the user can operate the tie rod downward or upward, which can simultaneously drive multiple connecting rods to swing downward or upward, thereby driving the flushing pipe to rotate and adjusting the spray angle of the nozzle.

[0022] According to the aforementioned filter cloth walking fully automatic filter press filter cloth deep cleaning device, a filter cloth walking fully automatic filter press filter cloth deep cleaning method includes: Step 1: The user operates the parallel lever mechanism to the upper limit position and locks it. The cleaning pump starts working, and high-pressure water is sprayed from the nozzle on the rinsing pipe onto the surface of the filter cloth. The filter cloth motor starts and drives the filter cloth to move downwards and around. The filter cloth motor stops after rinsing is completed. Step 2: Close the drain valve on the drain pipe of the water collection tank. The lifting device will operate to raise the water collection tank to the set position. The user will operate the parallel pull rod mechanism to lock it at the lower limit position. The cleaning pump will start working and high-pressure water will be sprayed into the water collection tank from the nozzle on the flushing pipe. After some cleaning water is injected into the water collection tank, the cleaning pump will stop working. Step 3: Turn on the heating device to heat the cleaning water in the collection tank to the set temperature; Step 4: Start the reagent dosing device and add the filter cloth cleaning agent into the water collection tank; Step 5: Start the cleaning pump. High-pressure water will be sprayed into the water collection tank from the nozzle on the flushing pipe again, so that the cleaning water in the water collection tank reaches the set water level. Step 6: Start the ultrasonic cleaning device; Step 7: Start the filter cloth motor to drive the filter cloth downwards and move around. During the operation, the bottom of the filter cloth is submerged in the cleaning water.

[0023] By adopting the above technical solutions and cleaning methods, the filter cloth can be initially cleaned, i.e., the surface of the filter cloth is rinsed and cleaned, and the filter cloth can also be deeply cleaned, which can effectively alleviate the problem of filter cloth clogging and extend the service life of the filter cloth.

[0024] Optionally, the heating device is equipped with a temperature monitoring probe, and the temperature of the cleaning water can be adjusted within the range of 30~80℃; The filter cloth cleaning agent includes dry powder and liquid, and the components of the filter cloth cleaning agent include alkaline filter cloth cleaning agent and acidic filter cloth cleaning agent; The ultrasonic generator has frequency and power adjustment functions, enabling frequency conversion cleaning from 20 to 80 kHz and power adjustment from 67.5 to 81 kW.

[0025] Optionally, in step seven, the filter cloth can be operated in two ways: The first type is where the continuous downward speed of the filter cloth is less than or equal to 20 mm / min; The second method involves a continuous cycle of filter cloth descending, filter cloth pausing, filter cloth deep cleaning, and filter cloth descending. During operation, a 60cm length of filter cloth is submerged in the cleaning water, and the effective cleaning time of the filter cloth in a single operation is no less than 30 minutes.

[0026] By adopting the above technical solutions and using the two filter cloth descent methods, it can be ensured that 60cm of filter cloth is always submerged in the cleaning water during operation, and the effective cleaning time of the filter cloth in a single operation is not less than 30 minutes. Not less than 30 minutes can ensure the effect of ultrasonic cleaning.

[0027] In summary, this application includes at least the following beneficial effects: 1. The cleaning device and method of this application will not affect the operation of the original unloading and cleaning device of the filter press. The adjustable lifting water collection tank is designed so that during the unloading process, the lifting device is in the initial position, and the filter material in the filter chamber has enough longitudinal space to fall onto the chain plate conveyor at the bottom of the filter press.

[0028] 2. The ultrasonic cleaning device of this application is optional and can be used as a filter cloth regeneration / deep cleaning measure. It is activated after the daily working cycle of the filter press. The ultrasonic generator uses the ultrasonic cavitation effect to generate local high-pressure shock waves through the formation and bursting of microbubbles in the liquid, which peel off solid particles and adhering substances from the gaps between the filter cloth fibers. Compared with high-pressure water washing, the cleaning is more thorough and causes less damage to the filter cloth fibers. It can effectively alleviate the filter cloth clogging problem and extend the service life of the filter cloth.

[0029] 3. The reagent dosing device of this application is optional and can be used as a supplementary measure for filter cloth regeneration / deep cleaning. It can be activated during ultrasonic cleaning. The addition of cleaning agent can further alleviate the filter cloth clogging problem. By selectively adding cleaning agent, the organic / inorganic particles clogging the filter cloth are dissolved, thereby extending the service life of the filter cloth.

[0030] 4. The heating device in this application is optional and can be used as a supplementary measure for filter cloth regeneration / deep cleaning. It can be activated during ultrasonic cleaning and, through temperature control, further enhance the ultrasonic and chemical cleaning effect, reduce the adhesion of blockages in the filter cloth pores, and extend the service life of the filter cloth. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a process flow diagram of a deep cleaning method (conventional cleaning) for filter cloth in a fully automatic filter press with a walking filter cloth.

[0033] Figure 2This is a process flow diagram of a deep cleaning method (ultrasonic cleaning) for filter cloth in a fully automatic filter press with a filter cloth walking mechanism.

[0034] Figure 3 This is a schematic diagram of a filter cloth deep cleaning device for a fully automatic filter press with a walking filter cloth design.

[0035] Figure 4 This is a partial structural diagram of the bottom of the filter plate of a fully automatic filter press with a filter cloth walking mechanism.

[0036] Figure 5 This is a partial structural diagram of the top of the filter plate in a fully automatic filter press with a filter cloth walking mechanism.

[0037] Figure 6 This is a table showing the change in air permeability of the filter cloth after high-pressure washing.

[0038] Figure 7 This is a table showing the change in air permeability of the filter cloth after ultrasonic cleaning.

[0039] Explanation of reference numerals in the attached drawings: 1. Filter plate; 2. Filter cloth; 3. Filter cloth motor; 4. Washing pipe; 5. Nozzle; 6. Cleaning rack; 7. Lifting device; 8. Water collection tank; 9. Ultrasonic generator; 10. Heating device; 11. Chain conveyor; 12. Drain pipe; 13. Chemical dosing device; 14. Tie rod; 15. Connecting rod; 16. Arc-shaped sliding plate; 17. Arc-shaped groove. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] The following is in conjunction with the appendix Figures 1 to 7 This application will be described in further detail.

[0042] This application discloses a filter cloth deep cleaning device and method for a fully automatic filter press with a walking filter cloth.

[0043] Example 1 Reference Figure 3 , 4 5. A filter cloth walking type fully automatic filter press filter cloth deep cleaning device, including filter press body and multiple filter plates 1 installed on filter press body.

[0044] The filter plate 1 is equipped with filter cloth 2, and each filter plate 1 is equipped with a filter cloth motor 3 on its top. The filter cloth 2 is a servo motor and a matching reducer. The filter cloth 2 is driven to move by the filter cloth motor 3 on the filter plate 1. The filter cloth motor 3 can achieve up and down movement of the filter cloth 2 from 20mm / min to 1250mm / min. By using frequency conversion speed regulation, the filter cloth 2 with a length of 2500mm can achieve up and down movement of the filter cloth 2 in a single operation within the range of 2 to 60min.

[0045] The filter plate 1 is equipped with a bottom-mounted flushing pipe 4, that is, the flushing pipe 4 is located at the bottom of the filter plate 1, 10~30mm below the filter cloth 2. The distance between the flushing pipe 4 and the filter cloth 2 can be adjusted arbitrarily within the vertical height range of 10~30mm.

[0046] Several nozzles 5 are installed on the flushing pipe 4. These are high-pressure flushing linear nozzles 5, with a width of 1 mm. The flushing pipe 4 is equipped with nozzles spaced 177 mm apart and placed at an angle of 43°. The angles of inclination to the horizontal plane are 33° and 76° clockwise, respectively.

[0047] The cleaning device also includes a cleaning rack 6, on which a water collection tank 8 is mounted via a lifting device 7.

[0048] The lifting device 7 includes an electric cylinder, which is a servo electric cylinder. The electric cylinder is mounted on the cleaning frame 6 and drives the water collection tank 8 to be raised and lowered. The servo electric cylinder technology is mature, easy to control, and stable and reliable.

[0049] Ultrasonic generators 9 are installed on both sides of the water collection tank 8. These generators have frequency and power adjustment functions, enabling frequency conversion cleaning from 20 to 80 kHz and power adjustment from 67.5 to 81 kW. Utilizing the ultrasonic cavitation effect, the generators produce localized high-pressure shock waves through the formation and bursting of microbubbles in the liquid. These shock waves peel away solid particles and adhering substances from the fiber gaps of the filter cloth 2. Compared to high-pressure water rinsing, this method is more thorough and causes less damage to the filter cloth 2 fibers. It effectively alleviates the clogging problem of the filter cloth 2 and extends its service life. The advantages of ultrasonic cleaning are good cleaning effect, simple operation, and the ability to remix the cleaning water.

[0050] A heating device 10 is installed at the bottom of the water collection tank 8. The heating device 10 heats the cleaning water in the water collection tank 8 to a set temperature. The heating device 10 is one or both of the immersion type and external type. The heating device 10 is equipped with a temperature monitoring probe. The temperature of the cleaning water can be adjusted within the range of 30~80℃. Through temperature control, the ultrasonic and chemical cleaning effects are further enhanced.

[0051] A conveyor is installed at the bottom of the water collection tank 8. The conveyor includes a chain plate conveyor 11, and the chain plate conveyor 11 has several mesh holes. The chain plate conveyor 11 can meet the transportation of sludge cake after the filter press is squeezed. The mesh holes on the chain plate facilitate the liquid to fall and avoid water accumulation.

[0052] A drain pipe 12 is provided at the bottom of the water collection tank 8, and a drain valve is provided on the drain pipe 12. The drain pipe 12 facilitates the discharge of liquid in the water collection tank 8, and the drain valve facilitates the water storage and drainage of the water collection tank 8.

[0053] The cleaning device also includes a chemical dosing device 13, which is used to add chemicals into the water collection tank 8. The addition of chemicals by the chemical dosing device 13 helps to provide a cleaning effect on the filter cloth 2.

[0054] A parallel tie rod mechanism is provided at the bottom of the filter plate 1. The parallel tie rod mechanism is connected to the flushing pipes 4 on several filter plates 1 and is used to drive the flushing pipes 4 to rotate. The parallel tie rod mechanism includes several tie rods 14 arranged along the direction of the filter plate 1, and the ends of the tie rods 14 are interlocked. The tie rods 14 with the same diameter are spaced apart. Each end of the flushing pipe 4 is provided with a connecting rod 15, and the connecting rods 15 are hinged to the tie rods 14. Through the setting of the parallel tie rod mechanism, the ends of the tie rods 14 are interlocked, which facilitates the opening and closing of multiple filter plates 1. When the filter plates 1 are closed, the tie rods 14 are closed together. When the filter plates 1 are opened, the tie rods 14 can also be pulled open at the same time. Through the connecting rods 15, the user can operate the tie rods 14 downward or upward, which can simultaneously drive the multiple connecting rods 15 to swing downward or upward, thereby driving the flushing pipes 4 to rotate and adjusting the spray angle of the nozzles 5.

[0055] The parallel lever mechanism also includes an arc-shaped sliding plate 16. The arc-shaped sliding plate 16 is arc-shaped and has an arc-shaped slot 17. Only one arc-shaped sliding plate 16 can be installed. The arc-shaped sliding plate 16 is located on the inner side of the lever 14 near the filter plate and is fixed to the bottom of any filter plate 1. A sliding pin is provided on the lever 14 with a larger diameter. The sliding pin is located in the arc-shaped slot 17 and can slide along the arc-shaped slot 17. When the user operates the lever 14 downward or upward, the connecting rod 15 is hinged to the lever 14. The connecting rod 15 swings around the axis of the flushing pipe 4. At the same time, the lever 14 also moves downward or upward and moves along the axis of the lever 14. Therefore, the sliding pin also swings around the axis of the flushing pipe 4, and its running trajectory is arc-shaped, so it can slide in the arc-shaped slot 17. The curved slide plate 16 and the curved groove 17 can support and guide the sliding pin and the pull rod 14, making the user's operation more stable and reliable. They also serve as a limit, restricting the rotation limit positions of the connecting rod 15 and the flushing pipe 4.

[0056] In this application, the filter cloth motor 3 drives the filter cloth 2 to move, and at the same time, the flushing pipe 4 and the nozzle 5 can flush the filter cloth 2, realizing the initial cleaning (conventional cleaning) of the filter cloth 2; by lifting the water collection tank 8 through the lifting device 7, the filter cloth 2 can be immersed in the water collection tank 8. By driving the flushing pipe 4 to rotate through the parallel pull rod mechanism, the spray angle of the nozzle 5 can be changed. Then, through the action of the ultrasonic generator 9 and the heating device 10, the cleaning water in the water collection tank 8 is heated and ultrasonically cleaned, realizing the deep cleaning of the filter cloth 2. In summary, the deep cleaning of the filter cloth 2 is achieved.

[0057] Reference Figures 1 to 7 A method for deep cleaning filter cloth in a fully automatic filter press with a walking filter cloth system includes: Step 1: The user operates the parallel lever mechanism to the upper limit position and locks it. The cleaning pump starts working. The cleaning pump is a variable frequency pipeline centrifugal pump, which can adjust the output pressure within the range of 6~12 Bar. High-pressure water is sprayed from the nozzle 5 on the flushing pipe 4 onto the surface of the filter cloth 2. The filter cloth motor 3 starts, driving the filter cloth 2 downward to move around, which is used for rapid shallow cleaning of the filter cloth 2 in the sludge / material filtering area. After flushing, the filter cloth motor 3 stops, completing the initial cleaning (routine cleaning) of the filter cloth 2. The applicant's test found that after flushing with 6 kg high-pressure water, after 20 filtration batches per day, the air permeability of the filter cloth 2 decreased by about 0.4% compared with the new filter cloth 2. Moreover, with the extension of the usage time, the rate of decrease in the air permeability of the filter cloth 2 becomes faster and faster, which is a non-linear decay. If deep cleaning (ultrasonic cleaning) is required, step 2 can be performed directly.

[0058] Step 2: Close the drain valve on the drain pipe 12 of the water collection tank 8. The lifting device 7 will operate to raise the water collection tank 8 to the set position. The user will operate the parallel pull rod mechanism to lock the lower limit position. The cleaning pump will start working. High-pressure water will be sprayed into the water collection tank 8 from the nozzle 5 on the flushing pipe 4. After some cleaning water is injected into the water collection tank 8, the water level will reach half of the set liquid level, and then the cleaning pump will stop working.

[0059] Step 3: Start the heating device 10 to heat the cleaning water in the water collection tank 8 to the set temperature.

[0060] Step 4: Start the agent dosing device 13 and add the filter cloth cleaning agent to the water collection tank 8. The filter cloth cleaning agent is one or two of the dry powder or liquid dosing devices. The agent components are one or more of the following: alkaline filter cloth cleaning agent (sodium hydroxide, sodium carbonate, sodium silicate, surfactant (nonionic / anionic)) or acidic filter cloth cleaning agent (hydrochloric acid, oxalic acid, citric acid, aminosulfonic acid, corrosion inhibitor). The appropriate agent can be selected according to the actual situation. Its function is to eliminate the blockages attached to the filter cloth 2.

[0061] Step 5: Start the cleaning pump. The user rotates the flushing pipe 4 by operating the parallel lever mechanism. High-pressure water is sprayed again from the nozzle 5 on the flushing pipe 4 into the water collection tank 8, so that the cleaning water in the water collection tank 8 reaches the set water level. Stir the cleaning agent and make it fully dissolve in the cleaning water. A small amount of cleaning agent that has not been stirred and dissolved will dissolve after the ultrasonic waves are turned on.

[0062] Step 6: Start the ultrasonic cleaning device; the ultrasonic waves are transmitted to the surface of the filter cloth 2 through the cleaning water. The ultrasonic generator can be either an integrated or a split ultrasonic generator, with both frequency and power adjustment functions. It can achieve frequency conversion cleaning of 20~80kHz (fine particles) and power adjustment within the range of 67.5~81kW.

[0063] Step 7: Start the filter cloth motor 3 to drive the filter cloth 2 downwards and around the surface. During operation, the bottom of the filter cloth 2 is submerged in the washing water. There are two ways the filter cloth 2 can descend: The first type is where the continuous downward speed of filter cloth 2 is less than or equal to 20 mm / min; The second method involves a continuous cycle of filter cloth 2 moving downwards, filter cloth 2 pausing, filter cloth 2 undergoing deep cleaning, and filter cloth 2 moving downwards again. During operation, a 60cm length of filter cloth 2 is immersed in the cleaning water, and the effective cleaning time of filter cloth 2 in a single operation is no less than 30 minutes.

[0064] By adopting the above technical solutions and using the two filter cloth descent methods, it can be ensured that a 60cm long filter cloth 2 is always immersed in the cleaning water during operation, and the effective cleaning time of the filter cloth 2 during a single operation is not less than 30 minutes. Not less than 30 minutes can ensure the effect of ultrasonic cleaning.

[0065] After cleaning, the water collection tank 8 descends to reset. The user operates the parallel pull rod mechanism to the upper limit position to lock and reset, and the filter cloth resets after cleaning.

[0066] The above cleaning methods can be used to perform preliminary cleaning of the filter cloth 2, namely rinsing and cleaning of the surface of the filter cloth 2, or to perform deep ultrasonic cleaning of the filter cloth 2, effectively alleviating the clogging problem of the filter cloth 2 and extending the service life of the filter cloth 2.

[0067] Example 2 The sludge produced from the treatment of wastewater from a certain livestock and slaughterhouse is a high-organic-matter, high-nitrogen-phosphorus, easily putrefied and foul-smelling organic sludge. It also contains a small amount of solid impurities such as hair, bone fragments, and grease. The sludge flocs have a small particle size. In industry, the air flotation method is commonly used to separate the sludge. After separation, the sludge enters a filter press for deep dewatering. Because the sludge is mixed with grease and protein in the production process, it is very easy to adhere to the filter cloth 2. At the same time, because the particle size is small, more sludge particles are squeezed and accumulated in the pores of the filter cloth 2 during filtration. This situation is also the main reason for the clogging of the filter cloth 2. Conventional high-pressure washing cannot clean the filter cloth 2 in a timely and effective manner. The service life of the filter cloth 2 is only 1 month.

[0068] After replacing the ultrasonic cleaning device in Example 1 above, the staff performed ultrasonic cleaning (frequency 75kHz, power 70kW) + 60℃ water temperature + 1% NaOH solution once a day, and the air permeability of filter cloth 2 recovered to 145L / (m). 2 ·s) (Initial air permeability is 150L / (m 2 The single-batch plate and frame filtration capacity of the dissolved air flotation sludge increased from 1.0±0.1 cubic meters to 3.5±0.3 cubic meters, and the effective filtration capacity of filter cloth 2 increased by 250% compared with that when it was clogged, effectively saving the replacement cost of filter cloth 2. Example 3 The wastewater sludge produced by a certain chemical plant contains about 10-20% heavy oil. Its disposal cost as hazardous waste is about 1200 yuan / ton. Due to the high content of heavy oil, although the sludge moisture content can be lower than that of a screw filter press when using a plate and frame filter press, the heavy oil in the sludge will directly adhere to the filter cloth 2 because the filter cloth 2 is made of polypropylene, nylon or polyester. In summer, the filter cloth 2 needs to be replaced about once every 30 days. In winter, due to the lower temperature and the reduced fluidity of the heavy oil, the filter cloth 2 needs to be replaced once every 15 days.

[0069] After replacing the ultrasonic cleaning device in Example 1 above, the staff performed ultrasonic cleaning (frequency 30KHz, power 80kw) + 80℃ water temperature + 3% NaOH solution once a day. The air permeability of filter cloth 2 then recovered to 135±5L / (m²). 2 ·s) (Initial air permeability is 150L / (m 2 The replacement frequency of filter cloth 2 is extended to 5 months in summer and 3 months in winter, which significantly reduces the replacement frequency of filter cloth 2 and effectively saves the replacement cost of filter cloth 2.

[0070] In the description of this invention, it should be understood that the terms "both sides," "bottom," "below," "top," "end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise specified and limited, it should be noted that the term "connection" should be interpreted broadly, for example, it can be a mechanical connection or an electrical connection, or it can be a connection within two elements, a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0071] The above are merely preferred embodiments of the invention and are not intended to limit the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A filter cloth walking type fully automatic filter press filter cloth deep cleaning device, comprising a filter press body and multiple filter plates (1) installed on the filter press body, wherein the filter plates (1) are provided with a bottom-mounted flushing pipe (4), the flushing pipe (4) is equipped with a plurality of nozzles (5), and filter cloth (2) is provided on the filter plates (1), characterized in that, Also includes: The filter cloth (2) is driven to move by the filter cloth motor (3) installed on the filter plate (1); A cleaning rack (6) is provided with a water collection tank (8) which is lifted and lowered by a lifting device (7). An ultrasonic generator (9) and a heating device (10) are provided in the water collection tank (8). A conveyor is provided at the bottom of the water collection tank (8). A parallel tie rod mechanism is provided at the bottom of the filter plate (1). The parallel tie rod mechanism is connected to the flushing pipes (4) on several filter plates (1) and is used to drive the several flushing pipes (4) to rotate.

2. The filter cloth walking type fully automatic filter press filter cloth deep cleaning device according to claim 1, characterized in that, The lifting device (7) includes an electric cylinder, which is mounted on the cleaning rack (6) and drives the water collection tank (8) to be raised and lowered.

3. The filter cloth walking type fully automatic filter press filter cloth deep cleaning device according to claim 1, characterized in that, An ultrasonic generator (9) is installed on both sides of the water collection tank (8), and the heating device (10) is installed at the bottom of the water collection tank (8).

4. The filter cloth walking type fully automatic filter press filter cloth deep cleaning device according to claim 1, characterized in that, The conveyor includes a chain plate conveyor (11), and the chain plate conveyor (11) has a number of mesh holes on its chain plate.

5. The filter cloth walking type fully automatic filter press filter cloth deep cleaning device according to claim 1, characterized in that, The bottom of the water collection tank (8) is provided with a drain pipe (12), and a drain valve is provided on the drain pipe (12).

6. The filter cloth walking type fully automatic filter press filter cloth deep cleaning device according to claim 1, characterized in that, It also includes a chemical dosing device (13) for adding chemicals into the water collection tank (8).

7. The filter cloth walking type fully automatic filter press filter cloth deep cleaning device according to claim 1, characterized in that, The parallel tie rod mechanism includes a plurality of tie rods (14) arranged along the direction of the filter plate (1), and the ends of the plurality of tie rods (14) are inserted into each other. The tie rods (14) spaced apart have the same diameter. The ends of the plurality of flushing pipes (4) are provided with connecting rods (15), and the plurality of connecting rods (15) are hinged to the tie rods (14).

8. The filter cloth walking type fully automatic filter press filter cloth deep cleaning device according to any one of claims 1-7, characterized in that, A method for deep cleaning filter cloth in a fully automatic filter press with a walking filter cloth system includes: Step 1: The user operates the parallel lever mechanism to the upper limit position and locks it. The cleaning pump starts working. High pressure water is sprayed from the nozzle (5) on the flushing pipe (4) onto the surface of the filter cloth (2). The filter cloth motor (3) starts and drives the filter cloth (2) to move downwards and around. After the flushing is completed, the filter cloth motor (3) stops. Step 2: Close the drain valve on the drain pipe (12) of the water collection tank (8). The lifting device (7) will operate to drive the water collection tank (8) to rise to the set position. The user will operate the parallel pull rod mechanism to lock the lower limit position. The cleaning pump will start working. High pressure water will be sprayed into the water collection tank (8) from the nozzle (5) on the flushing pipe (4). After some cleaning water is injected into the water collection tank (8), the cleaning pump will stop working. Step 3: Start the heating device (10) to heat the cleaning water in the water collection tank (8) to the set temperature; Step 4: Start the agent dosing device (13) and add the filter cloth cleaning agent into the water collection tank (8); Step 5: Start the cleaning pump. High-pressure water is sprayed again from the nozzle (5) on the flushing pipe (4) into the water collection tank (8) so that the cleaning water in the water collection tank (8) reaches the set water level. Step 6: Start the ultrasonic cleaning device; Step 7: Start the filter cloth motor (3) to drive the filter cloth (2) downward and around. During the operation, the bottom of the filter cloth (2) is submerged in the cleaning water.

9. A method for deep cleaning of filter cloth in a fully automatic filter press with a walking filter cloth as described in claim 8, characterized in that, The heating device (10) is equipped with a temperature monitoring probe, and the temperature of the cleaning water can be adjusted within the range of 30~80℃; The filter cloth cleaning agent includes dry powder and liquid, and the components of the filter cloth cleaning agent include alkaline filter cloth cleaning agent and acidic filter cloth cleaning agent; The ultrasonic generator has frequency and power adjustment functions, enabling frequency conversion cleaning from 20 to 80 kHz and power adjustment from 67.5 to 81 kW.

10. A method for deep cleaning of filter cloth in a fully automatic filter press with a walking filter cloth mechanism according to claim 8, characterized in that, In step seven, the filter cloth (2) descends in two ways: The first type is a filter cloth (2) with a continuous downward speed of less than or equal to 20 mm / min; The second method involves a continuous cycle of filter cloth (2) moving downwards, filter cloth (2) pausing, filter cloth (2) undergoing deep cleaning, and filter cloth (2) moving downwards again. During operation, a 60cm length of filter cloth (2) is immersed in the cleaning water, and the effective cleaning time of filter cloth (2) during a single operation is not less than 30 minutes.

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