High viscosity media are often stored in drums and must be retrieved from these for further processing. Since they can be so tough that there is no subsequent flow, special precautions have to be taken to make sure that their drum gets fully voided. Examples include ointments, pastes, greases, resins, silicones and adhesives. In the production of foodstuff highly viscous materials also appear: Peanut butter, tomato paste or dough are typical examples.
For these purposes KNOLL Maschinenbau offers its progressing cavity pump MX as submerged version for easy drainage of drums, mixers, agitators and big bags. The particular advantage of this type of pump is it that it can both transport tough to semisolid media and meter them while emptying the barrel except for very small rests. In addition to that transportation over relatively long distances with at the other end an exact placing in smaller containers is no problem. The MX-Pumps provide the pressure that is necessary in such situations, ranging from no pressure at up to 40 Bar.
The construction of the pump can follow very individual needs. A pneumatic control can be included (or omitted), as well as temperature regulation (heating for very high viscous media). In addition, the entire structure will be adapted to the size of the container to be emptied, so that both, normal 200-liter barrels, as well as smaller containers can be operated.
For the core of the system, the progressing cavity pump MX apply, of course, all the benefits of this series of pumps: Very good cleaning ability with intelligent separation points for easy disassembly and assembly as well as readiness for cleaning-in-place (CIP capability), gentle and low-pulsation conveyance of the cargo and the handling of high pressure due to the EvenWall technology, to name only a few.
In practical use the following plate is placed and fixed directly on the transport medium. Once the pumping starts, the following plate is moved down by using a pneumatic cylinder.
Seals between the plate and tap ensure that the cargo can escape only through the pump. The geometry of the following plate and the setting of the end points an almost complete emptying of the drum is reached. At the end of a discharge process, the follower plate is put back into its original position. It can then be easily cleaned or replaced.
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