61
English
11.5. Machine maintenance
11.5.1. Routine inspection of the blades
Machine performance and shredding speed greatly depend on the condition of the blades.
Enhance your own work comfort by taking the time to check, tighten and sharpen the blades, if
needed, every time you are about to use the machine.
SHARP BLADES = OPTIMAL PERFORMANCE
Pay particular attention to the following: Shredding
green waste with the ELIET shredding system is done
in two steps. The blades first come into contact with
the green waste when it reaches the chopping block.
During this
initial cutting (1)
, wood and leaves are
coarsely chopped into large, irregular chunks. These
large chunks then go into the shredding chamber
where they are finely chopped to produce small chips.
This is the second cutting
(2)
.
Wood chips move through the shredding chamber
until they reach the impeller at the end of the blade
shaft
(3)
. They are then ejected by acceleration
through the blow chute
(4)
.
Each of these cutting actions sets certain criteria that
the blades must meet for optimal shredding efficiency:
• The tips of the blades, in particular, are important
with regard to the initial cutting. Since the blades act
as splitting blades,
the cutting angle
is essential be-
cause this is the part that cleaves through the wood.
The cleaving angle of the cutting edge of the blades
should preferably be 30°. The sharper the blade
edges, the less resistance they will encounter when
splitting wood. This will lead to a smaller impact on
the machine itself. It will create a significant reduc-
tion in vibrations and noise. It will also benefit the
blade shaft and bearings. You should sharpen the
blades at regular intervals in order to maintain an
optimal splitting angle. (see Section 11.5.2, page 62)
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Summary of Contents for Prof 6
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