The oscillating frame is supported on dust-protected roller blocks in the side walls of the cooler and driven by the drive cylinder of the fully enclosed hydraulic system, also mounted in a dust-proof casing in the side wall. The centre guidance of the oscillating frame ensures perfectly parallel running.
The grate is driven by cylinders placed on either side of the cooler. The hydraulic drives consist of axial piston pumps with electro hydraulic servo adjustment of the oil flow to the cylinders which have built in linear transducers. The system is controlled by a PLC .The pump units have built in “swash” plates to regulate the oil flow and its direction.
This ensures very smooth operation of the moveable grate rows and perfect grate control. The system is very reliable and maintenance costs are low. If preferred, a conventional mechanical drive can be supplied instead.