Pressure belt filters

Belt filter systems

Pressure belt filters (DBF)

Pressure belt filters are often used in the cleaning of cooling lubricants, for example in the metalworking industry. An essential process in metalworking is, among other things, mechanical processing, such as machining or grinding. Due to the friction between the tool and the workpiece, heat is generated during machining and chips and metal particles are produced. Cooling lubricants are used to reduce the heat generated and to remove the chips and metal particles. In order to achieve optimum cooling and lubrication performance during the work process, such working fluids must be thoroughly cleaned. 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 the achievement of better surface qualities during machining as well as to greater cost-benefit efficiency.

The FAUDI pressure belt filter is ideally suited for cleaning cutting, grinding and rolling oils, emulsions and aqueous solutions. This filter can be used universally and can be optimally adapted to the respective conditions thanks to a modular design.

Depending on the material to be machined 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 finenesses of up to 10 μm.

How does a pressure belt filter work?

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 part of the pressure belt filter and is divided from the clean side consisting of the lower box by a slotted screen on which the filter fleece or endless belt rests. Two flap openings are located on the front side of the upper box, which are opened and closed pneumatically via toggle joints. These openings are required for dirt discharge. During filtration, the openings are closed and the filter belt is fixed by an internal lifting beam.

Filtration

Filtration takes place discontinuously via the filter pumps, which feed the upper chamber of the pressure belt filter from the dirt tank of the plant via the connecting pipelines. The contaminated liquid flows through the slotted screen and the filter belt. In the process, dirt particles are separated from the filter belt and a filter cake builds up. This filter cake retains increasingly finer dirt particles. The cleaned medium runs out of the drain at the bottom box in free falls into the clean tank.