Automatic cleaning type high-pressure plate-and-frame filter press

Abstract

The utility model discloses an automatic cleaning type high-pressure plate-and-frame filter press which comprises a rack, a filter pressing chamber, an automatic cleaning device and a filter pressing device, the filter plate assembly is movably mounted in the filter pressing chamber; the feeding system is communicated with the filter pressing chamber; the hydraulic system is connected with the filter plate assembly; and the cleaning system is arranged in the filter pressing chamber. By integrating the movable filter plate assembly, the automatic cleaning system and the sealing device in the filter pressing chamber and combining the cooperative work of the hydraulic system, the feeding system and the discharging system, the automation and high efficiency of the filter pressing process are realized. Meanwhile, the filter plate design of combining the fixed plate and the movable plate is adopted, and a cleaning system of a top spraying device is matched, so that the cleaning efficiency is remarkably improved, the service life of the filter plate is remarkably prolonged, the overall performance and the working efficiency of the filter press are improved, and the operation difficulty and the maintenance cost are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter press technical field especially is involved in a kind of automatic cleaning formula high-pressure plate-and-frame filter press. BACKGROUND

[0002] With the increasing of industrial wastewater treatment capacity, the traditional plate-and-frame filter press is faced with the problem of low treatment efficiency when treating high-concentration and high-viscosity wastewater. By optimizing the high-pressure plate-and-frame system, the filtration speed and dewatering rate can be improved, thereby significantly improving the overall treatment efficiency. Moreover, the wastewater produced by different industries has different properties, and the optimized high-pressure plate-and-frame system can better adapt to the treatment requirements of various complex wastewater and improve the flexibility and adaptability of wastewater treatment.

[0003] For example, a filter press with cleaning function disclosed in Chinese patent document, application number "CN201810255636.9", the outlet end of the extrusion box is connected with the inlet end of the first filter channel and the second filter channel, 4-8 filter plates are arranged in the first filter channel and the second filter channel, and the filter plates are separated into several filter zones, a water outlet pipe is connected to the side wall of each filter zone, the water outlet pipe of the first filter channel is connected with a first sewage tank, and the water outlet pipe of the second filter channel is connected with a second sewage tank, a first water supply pipe and a second water supply pipe are connected to the water storage tank, the first water supply pipe is connected to the inlet end of the first filter channel, and the second water supply pipe is connected to the inlet end of the second filter channel.

[0004] The above-mentioned scheme has two filter channels and has cleaning function. When the impurities on the filter plates in one filter channel are too much, it is necessary to stop running for cleaning, without stopping the work of the whole filter press, and the other filter channel continues to work, so that the filter pressing work is carried out continuously, thereby improving the production efficiency of the filter press. However, when treating high-turbidity sewage, the dosage of reagent is large, and the treatment effect is still not good, so the device needs to be optimized. UTILITY MODEL CONTENT

[0005] In view of the problems of low cleaning efficiency, complex operation and poor sealing performance of the existing technology mentioned in the background art, by integrating a movable filter plate assembly, an automatic cleaning system and a sealing device in the filter chamber, and by the coordinated work of the hydraulic system, the feeding system and the discharging system, the automation and efficiency of the filter pressing process are realized.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] The application discloses an automatic cleaning type high-pressure plate-and-frame filter, which comprises a rack, a filter chamber arranged on the rack, a filter plate assembly movably arranged in the filter chamber, a feeding system communicating with the filter chamber, a hydraulic system connected with the filter plate assembly and a cleaning system arranged in the filter chamber.

[0008] The rack serves as an overall support structure and provides a stable mounting base for various functional modules; the movable filter plate assembly arranged in the filter chamber realizes dynamic adjustment in the filter pressing process; the communication between the feeding system and the filter chamber ensures continuous feeding of materials; the connection between the hydraulic system and the filter plate assembly makes pressure control more accurate, thereby improving filter pressing efficiency; and the cleaning system arranged in the filter chamber can directly clean the filter plate, thereby reducing the time and labor cost for dismounting and cleaning.

[0009] Further, the filter plate assembly comprises a plurality of filter plates, and filter chambers are formed between adjacent filter plates. When the filter plates are tightly pressed, the pressure in the filter chambers can reach 5-30 MPa, which is much higher than that of conventional filter equipment. Under high pressure, liquid is forced to pass through micropores on the filter plates, and solid particles are trapped in the filter chambers. By increasing the filter area through a plurality of filter chambers, the filter efficiency can be theoretically improved by 3-5 times. Meanwhile, the number of filter chambers can be flexibly adjusted according to actual requirements, thereby adapting to production requirements of different scales. Compared with a single large filter chamber, the multi-filter chamber design can more evenly disperse pressure, reduce the risk of filter plate deformation and prolong the service life of the equipment. In addition, when cleaning or maintenance is required, only part of the filter chambers can be opened, without affecting the continuous work of other filter chambers, thereby greatly improving the availability and production efficiency of the equipment.

[0010] Further, the filter plate comprises a fixed plate and a movable plate, the fixed plate is fixedly connected with the rack, and the movable plate is connected with the hydraulic system. The combination of the fixed plate and the movable plate can improve the operation flexibility and filter pressing efficiency of the filter press, the fixed plate is fixedly connected with the rack to provide stable support for the entire filter plate assembly and ensure the structural integrity under high pressure, and the movable plate is connected with the hydraulic system to realize accurate pressure control and position adjustment. Specifically, the spacing between adjacent filter plates is dynamically adjusted within the range of 0.5-5 cm, which can adapt to different material characteristics and filtration requirements. The hydraulic system can provide a pressure of up to 40 MPa, so that the filter chambers between the filter plates can be highly sealed, thereby greatly improving the filtration efficiency. Compared with the fixed filter plate, the present application not only simplifies the filter cake unloading process, but also optimizes the filtration effect by adjusting the pressure distribution, and the filtration speed can be increased by 30-50%. In addition, the movable plate is convenient to maintain and replace, thereby significantly reducing the downtime and maintenance cost of the equipment.

[0011] Further, the cleaning system comprises a spraying device and a high-pressure water pump. The spraying device is arranged at the top of the filter chamber, and the high-pressure water pump provides a cleaning pressure of 15-20 MPa. The combination of the spraying device and the high-pressure water pump greatly improves the cleaning efficiency and quality. The spraying device is arranged at the top of the filter chamber to ensure uniform distribution of the cleaning liquid. The high-pressure water pump provides a cleaning pressure of 15-20 MPa, which is a pressure range that has been accurately calculated to effectively remove stubborn dirt on the filter plate surface without damaging the filter cloth. At this pressure, the water flow speed can reach 150-170 m / s, and the impact force generated is sufficient to remove 99% of common filter cake residues. Compared with low-pressure cleaning (usually 0.5-1 MPa), the cleaning time of the system can be shortened by 60-70%, and the water consumption can be reduced by about 40%. In addition, high-pressure cleaning can also penetrate into the gap between the filter cloth fibers, effectively preventing filter cloth pore blockage and extending the service life of the filter cloth by about 30%.

[0012] Further, the spraying device comprises a plurality of rotatable nozzles arranged at intervals of 50-100 mm along the length direction of the filter plate assembly, and the spray angle of the nozzles can be adjusted. One nozzle is arranged every 50-100 mm along the length direction of the filter plate assembly. This spacing ensures that the cleaning liquid covers the entire filter plate surface without dead angles. The rotatable nozzles can be adjusted within a range of 0-180 degrees to adapt to different filter plate shapes and dirt distribution. The vortex effect generated by the rotating nozzles can enhance the scouring force of the cleaning liquid, and the cleaning efficiency is improved by 30-40%. At the same time, the adjustable angle allows the cleaning liquid to impact the filter plate surface at the optimal incident angle. According to experimental data, an incident angle of 45-60 degrees can improve the cleaning effect by 20-25%. This not only improves the cleaning quality but also reduces water waste, and it is expected to save water by 15-20%.

[0013] Further, the system also comprises a discharge system arranged at the bottom of the filter chamber, which is composed of a collection tank with an inclination of 15-20° and a screw conveyor. The inclination angle of the collection tank is accurately calculated to ensure that the filter cake can smoothly slide under the action of gravity, while preventing blockage caused by too fast sliding. An inclination of 15-20° is suitable for most common filter cakes and can achieve an automatic discharge rate of more than 95%. The screw conveyor selects appropriate pitch and speed of the screw blade according to the viscosity and particle size of the material, and is usually set to 20-30 rpm to ensure stable and continuous conveying. Not only can it speed up the discharge speed, but it can also significantly reduce the labor intensity and safety risk. At the same time, the closed design reduces dust pollution and improves the working environment, meeting the environmental protection requirements of modern industrial production.

[0014] Further, a control system is also included, which employs a PLC programmable controller electrically connected with the feeding system, hydraulic system and cleaning system to realize automatic control. The PLC can monitor and adjust each subsystem of the filter press in real time. Through electrical connection with the feeding system, hydraulic system and cleaning system, the PLC can accurately control the feeding rate, pressure change and cleaning frequency. For example, according to the material characteristics, the PLC can dynamically adjust the frequency of the feeding pump to realize a feeding rate of 0.5-5 m³ / h; at the same time, the hydraulic system can be accurately controlled according to the filter chamber pressure feedback to keep the pressure in the optimal range of 20-40 MPa. In addition, the PLC can also automatically start the cleaning program according to the filtration period to optimize the cleaning time and water consumption, and through the data acquisition and analysis function, provide a basis for process optimization.

[0015] Further, the feeding system includes a variable frequency speed regulating feeding pump and a pressure-resistant feeding pipeline, which is connected with the filter chamber through a flange. The rotating speed of the variable frequency speed regulating feeding pump is steplessly adjusted in the range of 20-60 Hz, corresponding to a feeding rate of 0.5-5 m³ / h, which can be adjusted in real time according to different material characteristics and filter chamber pressure. This accurate control can optimize the filter cake formation process and improve the solid-liquid separation efficiency by about 20-30%. The pressure-resistant feeding pipeline is made of 304 stainless steel, which has good corrosion resistance and high pressure strength and can withstand a working pressure of up to 40 MPa. The pipeline is connected with the filter chamber through a flange to ensure the sealing and safety in the high-pressure environment.

[0016] Further, the hydraulic system includes a double-acting hydraulic cylinder and a variable plunger pump, the hydraulic cylinder is connected with the filter plate assembly, and the maximum working pressure reaches 40 MPa. The double-acting hydraulic cylinder can realize rapid opening and closing and accurate positioning of the filter plate, and the stroke can reach 500-1000 mm to meet the needs of different specifications of filter plates. The variable plunger pump can continuously adjust the pressure in the range of 0-40 MPa to adapt to the needs of different material characteristics and filtration stages. The maximum working pressure reaches 40 MPa, which is about 30-50% higher than that of the traditional filter press, and can handle higher solid content and more difficult to filter materials. The increase of pressure can significantly improve the filtration rate, and theoretically can increase the filtration efficiency by 40-60%. In the high-pressure environment, the moisture content of the filter cake can be reduced by 5-8 percentage points, improving the subsequent treatment efficiency. This system also has the characteristics of fast response, and the pressure adjustment time is not more than 0.5 seconds, ensuring the stability and continuity of the filter pressing process.

[0017] Therefore, the utility model has the following beneficial effects:

[0018] The high-pressure water pump and the adjustable nozzle can improve the cleaning efficiency and reduce the water consumption, and the high pressure of 15-20 MPa and the adjustable angle nozzle can effectively remove stubborn dirt while saving water by about 40%.

[0019] The inclined trough and screw conveyor discharge system achieves efficient automatic discharge. The 15-20° inclination and the appropriate screw conveyor increase the discharge efficiency by 50-70% and reduce manual intervention.

[0020] The PLC control system enables intelligent management of the entire process, real-time monitoring and automatic adjustment of parameters of each subsystem, improving production efficiency by 30-50% while reducing energy consumption by about 20%.

[0021] The variable frequency speed-regulating feed pump and high-pressure hydraulic system enhance the adaptability of the equipment. The adjustable feed rate of 0.5-5m³ / h and the maximum pressure of 40MPa improve the solid-liquid separation efficiency by 40-60%. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 yes Figure 1 A schematic diagram of the structure of the intermediate filter plate assembly.

[0024] In the diagram: 1. Frame; 2. Filter press chamber; 3. Filter plate assembly; 4. Feeding system; 5. Hydraulic system; 6. Cleaning system; 7. Filter plate; 8. Fixed plate; 9. Movable plate; 10. Spraying device; 11. High-pressure water pump; 12. Nozzle; 13. Discharge system; 14. Collection trough; 15. Screw conveyor; 16. Variable frequency speed control feed pump; 17. Pressure-resistant feed pipe; 18. Double-acting hydraulic cylinder; 19. Variable displacement piston pump. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1

[0027] like Figure 1 , 2 As shown, this invention provides an automatic cleaning type high-pressure plate and frame filter press. The filter press mainly consists of a frame 1, a filter chamber 2, filter plate assemblies 3, a feeding system 4, a hydraulic system 5, a cleaning system 6, a discharge system 13, and a control system. The frame 1 serves as the supporting structure for the entire device, and the filter chamber 2 is mounted on it, providing a sealed space for the entire filtration process. The filter plate assembly 3 is movably installed within the filter chamber 2, comprising multiple filter plates 7, with adjacent filter plates 7 forming filter chambers. Each filter plate 7 consists of a fixed plate 8 and a movable plate 9. The fixed plate 8 is fixedly connected to the frame 1, while the movable plate 9 is connected to the hydraulic system 5 to realize the opening and closing action of the filter plate.

[0028] The feeding system 4 is connected to the filter chamber 2 through a variable frequency feeding pump 16 and a pressure-resistant feeding pipeline 17. The variable frequency technology allows the pump speed to be adjusted steplessly within the range of 20-60 Hz, corresponding to a feeding rate of 0.5-5 m³ / h, which can be adjusted in real time according to different material characteristics and filter chamber pressures. The pressure-resistant feeding pipeline 17 is made of 304 stainless steel and can withstand a working pressure of up to 40 MPa. It is connected to the filter chamber 2 through flanges to ensure the sealing and safety in a high-pressure environment.

[0029] The hydraulic system 5 is composed of a double-acting hydraulic cylinder 18 and a variable plunger pump 19 and is connected to the filter plate assembly 3. The stroke of the double-acting hydraulic cylinder 18 can reach 500-1000 mm, meeting the needs of different specifications of filter plates. The variable plunger pump 19 can continuously adjust the pressure within the range of 0-40 MPa, with a maximum working pressure of 40 MPa, which is about 30-50% higher than that of traditional filter presses. This design not only can handle higher solid content and more difficult to filter materials, but also can significantly improve the filtration efficiency. The increase in pressure can significantly improve the filtration rate, and the filtration efficiency can be improved by 40-60%.

[0030] The cleaning system 6 is arranged in the filter chamber 2 and includes a spraying device 10 and a high-pressure water pump 11. The spraying device 10 is located at the top of the filter chamber 2 and is composed of a plurality of rotatable nozzles 12. These nozzles 12 are arranged at intervals of 50-100 mm along the length direction of the filter plate assembly 3, and the spraying angle can be adjusted. The high-pressure water pump 11 provides a cleaning pressure of 15-20 MPa. Under this pressure, the water flow speed can reach 150-170 m / s, and the impact force generated is enough to remove 99% of common filter cake residues. The rotatable design allows the nozzles 12 to adjust the spraying angle within the range of 0-180 degrees, adapting to different filter plate shapes and dirt distribution. According to the principle of fluid mechanics, the vortex effect generated by the rotating nozzles 12 can enhance the scouring force of the cleaning liquid, and theoretically the cleaning efficiency can be improved by 30-40%.

[0031] The discharge system 13 is arranged at the bottom of the filter chamber 2 and is composed of a collection tank 14 with an inclination of 15-20° and a screw conveyor 15. The inclination angle of the collection tank 14 is calculated accurately to ensure that the filter cake can smoothly slide under the action of gravity, while preventing blockage caused by too fast sliding. According to the principle of material mechanics, an inclination of 15-20° is suitable for most common filter cakes and can achieve an automatic discharge rate of more than 95%. The design of the screw conveyor 15 takes into account the viscosity and particle size of the material. The pitch and speed of the screw blades can be adjusted according to different material characteristics, and are usually set to 20-30 rpm to ensure stable and continuous conveying.

[0032] The control system adopts a PLC programmable controller, which is electrically connected with the feeding system 4, the hydraulic system 5, and the cleaning system 6 to realize automatic control. The PLC has high-speed processing capability, and can usually achieve a scanning period of milliseconds, so that it can monitor and adjust each subsystem of the filter press in real time. For example, according to the material characteristics, the PLC can dynamically adjust the frequency of the feeding pump; at the same time, according to the pressure feedback of the filter chamber, the hydraulic system 5 can be accurately controlled to keep the pressure in the optimal range of 20-40 MPa. In addition, the PLC can also automatically start the cleaning program according to the filtration period, so as to optimize the cleaning time and water consumption.

[0033] In this embodiment, the combination of the high-pressure hydraulic system 5 and the variable-frequency feeding pump 16 improves the adaptability of the equipment, which can handle various types of materials and achieve optimal performance in different filtration stages. Secondly, the automatic cleaning system 6 greatly improves the cleaning efficiency and quality, while saving water resources. Thirdly, the automatic discharging system 13 reduces manual intervention, improves production efficiency, and improves the working environment. Finally, the PLC control system realizes intelligent management of the whole process, which not only improves the production efficiency, but also reduces the energy consumption and maintenance cost.

[0034] In this embodiment, the rack 1 is made of Q345B high-strength steel, which has excellent compression and bending resistance. The main frame adopts a box structure with a wall thickness of 15 mm, which is formed as a whole by welding and bolt connection. The surface is sandblasted and coated with an epoxy resin anticorrosive coating with a thickness of not less than 120 μm, ensuring long-term use in corrosive environments. The bottom of the rack 1 is provided with adjustable supporting feet for easy horizontal adjustment of the equipment, and the adjustment range of the supporting feet is ± 50 mm. The filter chamber 2 is made of 304 stainless steel plate with a wall thickness of 10 mm, which has excellent corrosion resistance and strength. The internal space size is 2000 mm x 1500 mm x 1000 mm (length x width x height), which can accommodate 20-30 filter plates. The top and bottom of the filter chamber 2 are provided with sealing grooves, which use high-temperature and acid-alkali resistant fluororubber sealing rings with a hardness of 70±5 Shore A to ensure the sealing performance under high pressure (up to 40 MPa). The filter plate is made of polypropylene (PP) material by injection molding, with a thickness of 50 mm and a surface roughness Ra≤0.8 μm. Each filter plate weighs about 15 kg, which is convenient for manual operation. The filter plate surface is provided with precise grooves with a width of 0.5 mm, a depth of 1 mm, and a pitch of 2 mm, forming a high-efficiency filtration network. The filter cloth is woven from polypropylene monofilament, with a pore size of 10-50 μm, a thickness of 0.6 mm, and a tensile strength of ≥2000 N / 5 cm. The fixed plate 8 is connected with the rack 1 through a stainless steel pin shaft, and the ball joint is used at the connection between the movable plate 9 and the hydraulic cylinder, which allows a deflection angle of ± 2° to ensure uniform stress.

[0035] In this embodiment, the variable frequency speed control feed pump 16 adopts a double screw pump structure, the main shaft material is 17-4PH stainless steel, the hardness is HRC 40-45. The pump body adopts a double-layer structure, the inner layer is a wear-resistant ceramic coating with a thickness of 0.5mm, and the outer layer is 304 stainless steel. The maximum flow can reach 10m³ / h, and the highest working pressure is 50MPa. The frequency converter adopts vector control technology, the response time is <10ms, and the speed regulation accuracy is ±0.5%. The pressure-resistant feed pipeline 17 is made of 904L super austenitic stainless steel with a wall thickness of 10mm, the inner surface is electrolytically polished, the surface roughness Ra is ≤0.2μm, which reduces the friction loss of the inner wall of the pipeline and improves the conveying efficiency by about 15%. The double-acting hydraulic cylinder 18 adopts a chromium-plated piston rod with a surface hardness of HRC 58-62 and a plating thickness of 30-50μm. The inner wall of the cylinder barrel is treated by honing process with a surface roughness Ra of ≤0.4μm, which ensures the sealing performance and service life. The cylinder diameter is 200mm, the maximum working pressure is 40MPa, and the thrust can reach 1256kN. The variable displacement piston pump 19 adopts a 9-piston design with a displacement of 0-250mL / r, a maximum working pressure of 45MPa, and a volumetric efficiency of ≥98%. The pump body is made of high-strength aluminum alloy material (7075-T6), which reduces the weight and has good heat conductivity, which is beneficial to system heat dissipation. The high-pressure water pump 11 adopts a three-piston structure, the piston material is zirconia ceramic with a hardness of HV 1200-1300 and excellent wear resistance. The pump head is made of bimetallic composite material, the inner layer is Hastelloy C-276, and the outer layer is 304 stainless steel, which has good corrosion resistance and strength. The maximum working pressure is 20MPa, and the flow rate is 0-100L / min. The nozzle 12 is made of sapphire material with a hole diameter of 0.8-1.2mm, and the spray angle can be adjusted within 0-180°. The nozzle 12 spacing is 50-100mm, according to the principle of fluid dynamics, this arrangement can form a uniform impact force field on the filter plate surface, and the cleaning coverage rate is more than 98%. The collecting tank 14 is made of 304 stainless steel with a thickness of 6mm, the surface is polished with a roughness Ra of ≤0.8μm, which reduces the material adhesion. The tank body inclination angle is 15-20°, according to the granular mechanics theory, this angle range can ensure that most of the filter cake (density 1.2-2.5g / cm³) slides smoothly under the action of gravity, while avoiding blockage caused by too fast sliding. The screw conveyor 15 adopts a shaftless screw design, the screw blade is made of wear-resistant alloy steel (Mn13) with a thickness of 8mm and a hardness of HRC 58-62. The screw diameter is 300mm, the pitch is 300mm, the rotation speed can be adjusted within 10-40rpm, and the maximum conveying capacity can reach 20m³ / h.

[0036] In addition, the PLC adopts Siemens S7-1500 series, and the CPU processing speed can reach 1 ns bit operation, with 256 MB working memory and 1 GB storage capacity. The total number of I / O modules can be expanded to 8192 points, meeting the control requirements of complex systems. The human-machine interface adopts a 15-inch touch screen with a resolution of 1024x768 and a response time of <50ms. The system adopts a distributed control architecture and communicates through PROFINET field bus, with a communication rate of up to 100Mbps, ensuring the real-time performance and reliability of the control system.

[0037] Through component combination, not only the working efficiency and product quality of the filter press can be improved, but also the energy consumption and maintenance cost can be reduced. For example, the efficient cleaning system 6 can reduce downtime and improve equipment utilization; the precise control system can automatically adjust parameters according to different material characteristics, reducing human intervention and misoperation. This scheme fully considers the synergistic effect between components, realizing the optimization of overall performance.

[0038] When operating the filter press, the operator needs to set the initial parameters according to the characteristics of the material to be treated, including feed rate, filter pressure, cleaning cycle, etc. After starting the equipment, the frequency conversion feed pump 16 starts to deliver the material to the filter chamber 2. During the feeding process, the PLC control system monitors the feed pressure and flow rate in real time, and dynamically adjusts the pump speed according to the feedback data to ensure stable and uniform feeding.

[0039] When the material enters the filter chamber 2, the hydraulic system 5 starts to work. The double-acting hydraulic cylinder 18 slowly pushes the movable plate 9, making the filter plate assembly 3 gradually close. This process needs to be controlled accurately, usually at a speed of 0.5-1mm / s, to ensure uniform pressure distribution between the filter plates. During the closing process, the system will monitor the pressure curve, and if abnormal fluctuations are detected, it will immediately stop and alarm to prevent damage to the filter plates.

[0040] After the filter pressing process starts, the variable plunger pump 19 gradually increases the pressure, usually at a rate of 2-3MPa / min, until it reaches the preset working pressure (usually 30-40MPa). During this process, the PLC system will accurately control the pressure change rate according to the feedback of the pressure sensor, to avoid pressure mutation causing filter cake cracking or filter cloth damage. At the same time, the system will monitor the flow rate and turbidity of the filtrate, and when the flow rate drops to less than 10% of the set value or the turbidity reaches the preset standard, it will determine that the filter pressing cycle is complete.

[0041] After the filtration is completed, the discharge phase begins. The hydraulic system 5 first slowly releases the pressure to atmospheric pressure at a rate of about 3-5 MPa / min. Then, the hydraulic cylinder reverses its action to slowly separate the filter plates at a speed of 1-2 mm / s. At the same time, the discharge system 13 starts. The filter cake on the inclined collection tank 14 slides under the action of gravity, and the screw conveyor 15 starts to operate, with an initial speed of 15 rpm, and then automatically adjusts to 20-30 rpm according to the material flow. If an abnormal increase in the conveyor current is detected, the system will automatically reduce the speed or temporarily reverse to prevent blockage.

[0042] After the discharge is completed, the cleaning phase begins. The high-pressure water pump 11 starts, with an initial pressure of 10 MPa, and then gradually increases to 15-20 MPa. The nozzles 12 of the spraying device 10 start to rotate, with a spray angle of 0°, and a change rate of 5° / s, covering a range of 0-180°. The cleaning process lasts for 60-90 seconds, during which the system monitors the turbidity of the drainage, and when the turbidity decreases to a preset value, the cleaning is automatically ended. If the first cleaning is not satisfactory, the system will automatically perform a second round of cleaning, while adjusting the angle of the nozzles 12 and the water pressure to improve the cleaning effect.

[0043] In production applications, the filter press disclosed in this scheme can be used in chemical, metallurgical, environmental protection and other industries. For example, in a sewage treatment plant, it can be used to treat oil-containing sludge. In this application, the speed of the feed pump is usually set at 30-40 Hz, corresponding to a flow rate of about 2-3 m³ / h. The filtration pressure is set at 25-30 MPa, and the filtration time is about 60-90 minutes. The cleaning water pressure is set at 18 MPa, and the cleaning time is 45 seconds. Under this setting, the water content of the sludge can be reduced from the initial 80-85% to 40-45%, greatly reducing the energy consumption of subsequent treatment. In the metallurgical industry, such as bauxite processing, the filter press disclosed in this scheme can be used for the dewatering treatment of red mud. Since red mud has high alkalinity and corrosiveness, the selection of equipment material is particularly important. In this case, the filter plate can consider using a composite material of polypropylene and 20% glass fiber to improve corrosion resistance and strength. The filtration pressure can be increased to 35-40 MPa, and the filtration time can be extended to 120-150 minutes, which can reduce the water content of the red mud from 50-55% to 25-30%, significantly improving the subsequent drying efficiency.

[0044] Example 2

[0045] Some technical solutions are additionally proposed in this embodiment based on Embodiment 1. For example, a vibrating device can be added to the filter plate to further improve the filtering efficiency and cleaning effect by using micro-vibration technology. In addition, ultrasonic cleaning technology can be considered to replace or assist high-pressure water cleaning, which can further improve the cleaning effect, especially for some difficult-to-remove dirt. In terms of the discharge system 13, a pneumatic conveying device can be considered to replace the screw conveyor 15, which can be more suitable for the conveying of some special materials. In addition, online monitoring devices such as turbidity sensors and pressure sensors can also be considered to be added to the system to achieve more accurate process control and quality monitoring.

[0046] Another optimization scheme in this embodiment is to add a pneumatic auxiliary device in the discharge system 13. The pneumatic auxiliary device introduces compressed air (pressure 0.5-0.8 MPa) into the filter chamber while the filter plate is separated, which can help the filter cake to be separated from the filter cloth more quickly and completely, and is suitable for materials with higher viscosity, which can reduce the residual rate by more than 50%.

Claims

1. An automatic washing type high pressure plate-and-frame filter, characterized by, The utility model relates to a kind of filter press, including: Frame, filter chamber is arranged on the frame; Filter plate assembly, the filter plate assembly is movably installed in the filter chamber; Feed system, the feed system is communicated with the filter chamber; Hydraulic system, the hydraulic system is connected with the filter plate assembly; Washing system, the washing system is arranged in the filter chamber.

2. The self-cleaning high pressure plate and frame filter press according to claim 1, characterized in that, The filter plate assembly includes a plurality of filter plates, and filter chambers are formed between adjacent filter plates.

3. The self-cleaning high pressure plate and frame filter press according to claim 2, characterized in that, The filter plate includes a fixed plate and a movable plate, the fixed plate is fixedly connected with the frame, and the movable plate is connected with the hydraulic system.

4. The self-cleaning high pressure plate and frame filter press according to claim 1, characterized in that, The washing system includes a spraying device and a high-pressure water pump, the spraying device is arranged at the top of the filter chamber, and a cleaning pressure of 15-20 MPa is provided by the high-pressure water pump.

5. The self-cleaning high pressure plate and frame filter press according to claim 4, characterized in that, The spraying device includes a plurality of rotatable nozzles, the nozzles are arranged at intervals of 50-100 mm along the length direction of the filter plate assembly, and the nozzle spray angle is adjustable.

6. The self-cleaning high-pressure plate-and-frame filter press according to any one of claims 1 to 5, characterized in that It also includes a discharge system, which is arranged at the bottom of the filter chamber and consists of a collection tank with an inclination of 15-20° and a screw conveyor.

7. The self-cleaning high pressure plate-and-frame filter according to any one of claims 1 to 5, characterized in that It also includes a control system, which uses a PLC programmable controller and is electrically connected with the feed system, hydraulic system and washing system to achieve automatic control.

8. The self-cleaning high pressure plate and frame filter press of claim 1, wherein, The feed system includes a variable frequency speed regulation feed pump and a pressure-resistant feed pipeline, and the feed pipeline is connected with the filter chamber through a flange.

9. The self-cleaning high pressure plate and frame filter press of claim 1, wherein, The hydraulic system includes a double-acting hydraulic cylinder and a variable displacement piston pump, the double-acting hydraulic cylinder is connected with the filter plate assembly, and the maximum working pressure reaches 40 MPa.

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