Nederman HD82, Instruction Manual, Page: 13 / 22

HD82
13 QMM001(02)
EN
4 Safety
This chapter contains important information that refer to a potential hazard to
the health and safety of personnel, and how that hazard may be avoided.
• Electrical installations have to be done by qualified personnel only.
• At connection of voltage feed as well as at service and maintenance work
on the centrifuge the circuit breaker must be off.
• Test the emergency stop at installation and always when maintenance and
service have been done.
• The centrifuge must not be operated with the covers removed.
• Materials able to centrifuge are different qualities of steel swarf as well as
brass and cast iron swarf, if any other material please ask Nederman.
• The data sheet from the coolant supplier must be studied as parts from
coolant can cause allergic reactions.
WARNING!
The floor around the centrifuge might get slippery from coolant getting
outside the machine.
5 Description
5.1 Function
The NEDERMAN horizontal centrifuge is a drum centrifuge, which via
rotation movement exposes the supplied material to high G-forces. The solid
particles are separated on the inner periphery of a screen, whilst the liquid
passes through this.
Figure 1 shows the material flow through the centrifuge.
The material fed in through the top inlet hopper ( 1 ), glides down and is fed
directly to the drum walls ( 6 ). On contact with the drum walls the material is
accelerated to the speed of the drum at the periphery. During this acceleration
phase the material moves outwards along the drum until it comes into contact
with the wedge bar screen (
3
) or remaining layer of previously accelerated
material. By building up an additional layer of material over the previous layer
the old material is forced to glide over the screen and out from the centrifuge
via the outlet for dry chips ( 4 ). During the time the material is exposed to the
centrifugal force the liquid is separated from the solid particles. When the
material passes over the screen the liquid goes through this and out from the
centrifuge via the outlet for liquids ( 7 ). This outlet is located immediately
behind the outlet for dry chips.
A conveyor should be connected to remove the solid particles. The liquid
should be drained to a sedimentation tank, which in turn should be equipped
with a drag conveyor.
Your NEDERMAN Swarf Centrifuge is designed to operate at high rpm and
is almost completely vibrationless. Each component in the rotating system
is individually balanced so that all parts are fully replaceable without disturbing
overall balance.