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at the start of each shift, pump grease in until it comes out between the cone
bushing and the screw shaft. Then he should open and shut the cone three times
in order to spread the grease.
Rarely, presses are supplied with additional lubrication fittings so that water, in
addition to grease, can be metered to the bushings as a lubricant.
Automatic grease systems are available. These should be the high pressure (900
psi) electric or battery variety. Vincent provides these for critical applications,
especially pulp & paper.
Liquid leaking past the cone bushings drains out the back of the cone (at the air
cylinder end of the press). Almost always it is minimal compared to the flow of
press cake. However, a pan can be provided to collect this liquid and drain it into
the main flow of press liquor.
WING FEEDERS
Sometimes there are blades welded to the outside tips of the last two flights of the
screw. Called "Wing Feeders", these are mounted parallel to the discharge screen
surface. Care must be taken that wing feeders are not made so long that they hit
the face of the cone when the cone is in the closed position.
Wing feeders can serve two purposes. (1) In the case of materials that want to
channel out the discharge of the press, like pineapple and spent brewer's grains,
long wing feeders break up the channeling flow. (2) For abrasive applications,
short knobby wing feeders are provided as sacrificial wear elements.
When certain materials are fed through a screw press, clumps of dry material may
pack in front of the wing feeders. This buildup can cause wear of the screen.
Should the problem occur, grind off the wing feeders.
LONG WING FEEDER KNOBBY WING FEEDER
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