As any experienced earthmoving equipment operator knows, production
of any earthmoving machine is dependant on a number of variable parameters.
These parameters range from moisture content, job layout, and plasticity
of material through to operator technique to name just a few.
MISU advocate the most suitable method to determine
an accurate production estimate of a particular material of a required
size
through a particular model MISU unit, is to physically do an onsite
timed production demonstration where practicable.
The first step is to ensure that the correct build of the screening
unit specification is applied, the approved installation to the carrier
machine and fine-tuning of the side rakes produces a finished product
that meets the required specification.
The next step is to cycle the unit noting the average cycle time
and the conservative cubic capacity of the unit.
Theoretical Calculations for MISU Units
As an example, lets assume we have a 1.2 cubic metre capacity
EW140 correctly installed on a nominal 20 tonne excavator. Assuming
we are happy with the finished product we can cycle the unit. Assuming
the unit takes 45 seconds to cycle this is 0.75 of one minute. To
be conservative we allow 1.1 cubic metres per cycle and production
calculations are derived on 50-minute hours. (An average 10-minte
loss is used to cover waiting time, positioning the machine and other
unproductive time).
From the above we can conclude:
- 50 minutes divided by the average cycle of 45 seconds (0.75
of a minute) equals 67 cycles per (50minute) hour.
- 67 cycles multiplied by 1.1 cubic metres give a conservative
average production of 73.7 cubic metres per hour.
 Similarly with the above parameters, productivity for EW100 &
EW180 model excavator screens would be:
EW100: @ 0.6 cubic metre capacity = 40.2 cubic metre's per hour
EW180: @ 1.6 cubic metre conservative capacity = 107.2 cubic metre's
per hour
(The above information is provided as a theoretical guide only)
production estimate guidelines
If an onsite demonstration is not possible we have prepared the
following graph to
assist potential customers to calculate production in a selection
of common materials. This information is offered
based on experience and external parameters may increase
or reduce these estimates.
To open the *.pdf file you will need Adobe Acrobat Reader 6.0
which can be downloaded from here.
Should you wish to discuss any aspect of potential production
of your material please do not hesitate to contact our experienced
operators
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