Belt filter systems: pressure belt filters (dbf)
An essential process in metalworking is, among others, mechanical processing, such as machining or grinding. Due to the friction between the tool and the work piece, heat is generated during machining and chips and metal particles are produced. So-called cooling lubricants are used to reduce the heat generated and to remove the chips and metal particles. Such work fluids must be thoroughly cleaned so that optimum cooling and lubrication performance can be achieved during the work process. Careful cleaning not only decisively extends the service life of the cooling lubricants, but also considerably protects the environment at the same time. In addition, cooling lubricant cleaning contributes to achieving better surface qualities during machining as well as greater cost-benefit efficiency.
The FAUDI pressure belt filter is ideal for the cleaning of cutting, grinding and rolling oils, emulsions and aqueous solutions. This filter is universally applicable and can be optimally adapted to the respective conditions due to its modular design.
Depending on the material which has to be cut and the filter material used, the separation range is between 30 and 100 μm. The optional precoating of the pressure belt filter with additional filter aids enables filter fineness of up to 10 μm.
How does a
The pressure belt filter is a fully automatic cooling lubricant filter, which consists of two chambers; the upper and the lower box. The dirt chamber is the upper section of the pressure belt filter and is divided from the clean side consisting of the bottom box by a slotted sieve on which the filter fleece or endless belt rests. There are two hinged openings on the front sides of the upper box, which are opened and closed pneumatically by toggle joints. These openings are needed for dirt discharge. During filtration, the openings are closed and the filter belt is fixed by an internal lifting bar.
Filtration is performed discontinuously by the filter pumps, which feed the upper chamber of the pressure belt filter from the dirt tank of the plant through the connecting pipelines. The contaminated liquid flows through the slotted sieve and the filter belt. In this process, dirt particles are separated from the filter belt and a filter cake is formed. Through this filter cake, increasingly finer dirt particles are retained. The cleaned medium flows from the drain at the lower box into the clean tank.
Depending on the processing, the regeneration of the filter is activated when the preset differential pressure in the pressure belt filter or a preset filtration time is reached. The filter pump and thus the inflow into the pressure belt filter are stopped and the filter contents are emptied from the pressure belt filter into the clean tank using compressed air. After emptying the pressure belt filter, the filter cake is dried by compressed air in the filter. The side flaps of the pressure belt filter then open and the filter belt with the dried dirt is discharged from the filter. When the dirt is discharged, a beater shaft, a brush and a rinsing device ensure that the filter belt is cleaned and made available for filtration again.
Benefits: Your advantages
at a glance
High throughput capacity
Easy discharge of the filter cake with low residual moisture due to drying before discharge
Short regeneration time
High economic efficiency
Good maintenance possibility
Use of different plastic fabrics possible
New extremely pressure-resistant design
Combination of plastic belt and filter fleece possible
Data and facts
Up to 10 µm
Oils and processing emulsions
Belt and fleece combination, belt
Optionally with filter aid or without filter aid
Filter surface area
4; 5 and 6 m² per Filter
Application areas: How they are used
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References: Projects with pressure belt filters
- Wash water filtration in a high-tech engine plant with FAUDI AFBTo complement the largest single order ever received by FAUDI, an impressive belt filter system, FAUDI type AFB 7.5/1000 in…
- FAUDI vacuum filter systems in the Chinese steel industryFAUDI filtration technology is in demand worldwide - The Chinese steel industry also relies on FAUDI vacuum filter systems made…
- FAUDI pressure belt filters in operation for one of the largest automobile manufacturersComplex engineering: A FAUDI pressure belt filter system in operation in Tianjin, China, for one of the largest German car…
- FAUDI folding belt filters in the production of industrial technologyFAUDI has designed, manufactured and delivered a folding belt filter system for the filtration of oil during the sharpening process…