This
type of greasing system constitutes a governing component of our chain-type
fixed weed screen cleaning systems installed at open-source water intakes
of some irrigation pumping stations in Egypt. It handles greasing of
parts well immersed in water. Backed by a proprietary control system,
a self-starting greasing system is used to grease lower sprockets for
a few seconds upon operation of a weed screen cleaning machine. The
greasing interval is entirely adjustable. So as lower sprockets are
greased, a 20-bar greasing pump is used to pump grease through appropriate
tubing to lower sprocket pins having channels leading to helical grooves
on the internal surfaces of copper sleeves. Grease eventually flows
in drain lines to drain cups. As opposed to single machine operation,
starting multiple machines in the automatic mode calls for greasing
of multiple lower sprockets. This is carried out on a consecutive basis
and machines are handled one after another. Having finished the required
greasing cycle, the greasing pump motor is turned-off, solenoid valves
are closed and the cycle is never restarted unless another machine is
manually or automatically operated.