Pressure filter - in which position and heating of mixer-compactor hovel-blades of improved design is processor controlled

摘要

A pressure filter in which the mixer/compactor shovel-blades are raised or lowered under processor control according to the power required by the mixer/compactor drive unit . If the power requirement of the drive unit exceeds a value stored by the processor and has not fallen back below this value after a set time measured by the processor, the shovel-blades are lifted upwards.Conversely, the shovel-blades are lowered by a similar, but reverse, method the preset power-required level is reached (or the blades are in their lowest position). The heating of the filter housing and particularly the shovel-blades can be controlled by processor. The shovel-blades are shaped to provide maximum transfer of heat from their upper surfaces and minimal drag. The shovel-blade arms can be shaped to cause movement of the filter cake material away from the middle towards the outside of the filter surface. USE/ADVANTAGE - Filters of this type are used mainly in the production of pharmaceuticals. An energy saving is achieved over previous methods using larger motors to overcome resistance met by the shovel-blades in the inspissating product. The controlled heating and improved design of the shovel blades also save energy.