Vacuum band filter is more suitable for suspension filtration scenarios that have large processing capacity and require continuous operation. It takes the crawler belt as the transmission carrier, combines with vacuum suction to realize dynamic power, and can efficiently complete the whole process of feeding, filtering, washing, dewatering, discharging, etc. It can carry out multi-stage filtration and washing for materials in Europe, greatly improve the efficiency of solid-liquid separation and filtrate purity, and is one of the key equipments for realizing cleaner production and resource recycling in the modern industry.

Working Principle

The working principle of Vacuum band filter is mainly to utilize the pressure difference produced by the vacuum negative pressure, combined with the continuous transmission of the filter belt, to realize the dynamic solid-liquid separation of the suspension, which can be specifically divided into five key links.

 

Feeding：The suspension to be filtered is evenly spread on the filter belt through the feeding device, and the belt is driven forward by the drive roller.

Vacuum filtration：The vacuum box below the filter belt forms a negative pressure, under the difference between the atmosphere and the negative pressure, the filtrate enters the vacuum box through the filter cloth and filter belt, and the solid particles are retained to form the filter cake.

Washing(Optional)：According to the process requirements, the washing device sprays washing liquid to the filter cake, and the washing liquid is pumped away with the help of vacuum, so as to remove the soluble impurities from the filter cake.

Drying: the filter cake enters the subsequent vacuum area with the filter belt, and the residual water is discharged under negative pressure to reduce the water content.

Discharge: The dry cake reaches the end of the filter belt, and is separated from the filter belt by the discharge roller or scraper to complete the filtration cycle.

The whole process is continuous and uninterrupted, the speed of filter belt, vacuum and other parameters can be flexibly adjusted by the control system to suit different materials.

Core accessories of vacuum band filter: 

· Filter belt: as the core filtration parts, there are polyester mesh, polypropylene mesh lamp material, and it can choose acid and alkali resistance, high temperature resistance, or food-grade material according to the characteristics of materials.

· Vacuum system: vacuum box, water cup type, rotary vane light vacuum pump, and vacuum pipeline and valve covering the filter belt contact to generate negative pressure.

· Transmission system: It consists of driving roller, guiding roller, tensioning roller for adjusting the tension of filter belt, as well as transmission motor and reducer.

· Feeding and washing device: there is a feeding hopper with a fabricator to make the material uniformly distributed, multiple washing nozzles to realize multi-stage washing, and washing pump.

· Auxiliary devices: filter belt correcting device, filter belt cleaning device, discharging scraper, frame and guardrail.

Technical features：

· Continuous and automation: continuous operation design, together with PLC control system, it can realize fully automatic operation of feeding, filtering, washing and discharging, reducing manual intervention and stabilizing production efficiency; 

· High-precision filtration: the filter belt is made of a variety of materials (e.g. polyester, polypropylene, etc.), and the appropriate aperture can be selected according to the size of material particles to ensure the clarification of the filtrate. High-· Precision filtration: the filter belt is made of various materials (e.g. polyester, polypropylene, etc.), and the appropriate pore size can be selected according to the particle size of the material to ensure the clarification of the filtrate, meanwhile, it supports multi-stage washing, which can greatly reduce the residual impurities in the filter cake. 

· Strongly Adjustable Parameters: the key parameters such as the speed of the filter belt (usually 0.5-5m/min), the vacuum degree (usually - 0.04 to - 0.08MPa), and the amount of water for washing can be adjusted flexibly to adapt to the different viscosity and granularity of the materials (e.g. sludge, crystals, slurry) Modular structure: it is composed of filtration section, washing section, drying section, etc. Modules can be added or subtracted according to the process demand, for example, increasing the washing section to improve the purification effect, or extending the drying section to reduce the water content of the filter cake. 

· Energy-saving and environmentally friendly: the vacuum system adopts high-efficiency vacuum pumps, with energy consumption lower than that of the traditional pressurized filtration equipment; the belt can be reused repeatedly, and the washing water can be recycled (part of it is recycled). The filter belt can be used repeatedly, and the washing water can be recycled (in some scenarios), reducing the waste of resources. 

Maintenance

The use of any equipment can not be separated from the daily maintenance and maintenance, do a good job of routine maintenance, in order to make the use of equipment for a longer period of time.

Daily Maintenance: 

· Keep an eye on the status of the filter belt to see if there is any breakage or deviation, if there is, you need to adjust the deviation correction device or change the new filter belt.

· Clean up the debris in the vacuum box to ensure smooth vacuum pipeline and maintain the stability of the vacuum degree.

· Check the chains and gears of the transmission system, tighten them in time and add lubricant if they are loose.

· Clean the nozzle of the filter belt cleaning device to prevent clogging and affect cleaning.

Regular maintenance: 

· Check the tension of the filter belt every week and adjust it with the tension roller to prevent too loose affecting filtration or too tight damaging the filter belt.

· Check the working condition of the vacuum pump every month, change the oil of the rotary vane type and replenish the circulating water of the water ring type.

· Quarterly dismantle the vacuum box to check the seals, and replace them in time for serious wear and tear to prevent air leakage.

· Maintain the transmission motor and reducer every year, check the bearings and replace them if necessary.

Special maintenance: 

· After handling corrosive materials, flush the inside of the equipment with water to prevent parts times corrosion.

· Before long-term shutdown, clean and dry the filter belt, loosen the tension of the filter belt, turn off the power supply and vacuum system, and do a good job of dust protection.

· Standardized maintenance can prolong the life of the equipment and guarantee stable filtration efficiency.

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