Vincent Cone Timers (Vct's) - VINCENT CP-12 Operation & Maintenance Manual

useful for applications where long stringy material wraps itself around the screw. The
reversing action will knock free (untie) the stringy material.
Vincent is also more frequently using level controls, particularly in those applications where
the flow to the press can vary substantially. The level controls can be tied to the VFD or a
control system to speed up the press when it reaches a certain level or to gradually increase
screw speed or decrease back pressure to increase press throughput.
Vincent Cone Timer (VCT's)
For some applications a timer is used to periodically open the cone. There are two timer
settings on the cone timer. Timer 1 determines the interval between cone openings. Timer 2
determines how long the cone remains open. Both of these are set by trial and error,
manually opening and closing the cone using the three-position valve and then setting the
timers accordingly to make it automatic.
Cone timers are most frequently used when there is no level sensor. With abrasive materials,
low flow to a press maintained under compression will prematurely wear the screw and
screen at the discharge. As an example, we had a location where flow to the press would
stop for hours and the wood waste material would get completely dry, creating a "Presto
Log". When the flow started again, the presto log would freeze, blowing out the screens and
bending back screw flights.
Alternatively, the cone timer is used with slippery or slimy press cake that cannot be
dewatered to sufficient firmness to force the cone open.
Cone Timer panels are available from Vincent at no charge.
20