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some KP-10’s used on dairy manure may use a 5' extension arm with a hundred
pounds of weight.
With some feed materials, the press can be operated with the discharge cone in
the withdrawn position. The screw alone may do enough compressing and
dewatering to produce a cake at the discharge.
It is acceptable to open the discharge cone, in most cases, during normal operating
conditions. This allows inspection, while in operation, of the discharge end of the
screw and screen. This will give the operator a chance to observe operation with
minimum dewatering and maximum throughput. It is also a good technique for
purging bad material i.e., either jammed or spoiled material, from the press. (Do
not try this trick if you are pressing hot or chemically aggressive materials.)
Where very low air pressure is required for proper operation, it may be practical to
put the 4-way valve in a neutral position, half way between open and closed. A
press can not be left permanently in this condition: keep in mind that a slug of cake
will push the cone open, and it will not re-close on its own afterwards.
An unusual technique is to set the air pressure so that the cone normally stays
completely shut. A timer is used to periodically open the cone. The closed period
is determined by the amount to time required for press cake to accumulate in the
press. This type of operation is used with slippery or slimy press cake that cannot
be dewatered to sufficient firmness to force the cone open. The duration of the
"cone open" period is long enough to dump the press cake that has been formed.
Cone Timer panels are available from Vincent at no charge.
Once through start-up, the cone is almost always left in the closed position at
whatever air pressure had been found to be effective. A plug of cake will be left
around the cone whenever the press is turned off; this will clear on its own accord
on restarting the press.
There are a few applications where the air cylinder Is removed and replaced with a
jacking bolt. This is used if the cone pushes completely closed even with the
lowest air pressure. It results in operating the press with a fixed discharge annulus.
Air cylinders with linear actuators are available.
ROTATING CONE OPTION
Most KP screw presses are offered with an optional feature which makes the cone
rotate and strip away the press cake. The rotation is driven by two large pins
mounted on the back of the cone. These pins engage with a collar which is clamped
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