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Our forum member JOHN.......is excellent on this type of question.......he may be able to guide you.
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I have no direct practical experience of this particular application- but as I understand the requirements the springs will be required to perform two quite different functions.
1)A set of springs to support the static load of the mill and to isolate dynamic loads to the foundations, and for good isolation these springs need to be quite soft. Operating at 1500 rpm springs which compress about 21mm under the static load of the mill will reduce dynamic loads by about 98%.
2)A set of radial locating springs at each end of the drum. As I understand the application the ideal stiffness for these springs would be such that they compress only a small amount (5mm which is equal to the vibrating amplitude), under the dynamic load of the drum at 10g (3000 kg x 10 x 0.5 = 15000 kg), and so these springs would need to be very stiff. ■
Spring Design for a Vibro Finishing Mill
Dear All,
I am new in this forum. Appreciate some help from fellow forum users on the designing of springs for a Vibro Finishing Mill.
The Vibro Finishing Mill is used to finish grind minerals.
It consists of a mild steel cylinder having a outer diameter of 0.5 meter and a length of 2 meter. It is filled up with rod measuring 25mm diameter and 1.95 mtr long.
The total weight of the cylinder along with grinding media and motor is around 3000 kg.
This cylinder is suspended in a hexagonal structure through compression springs.
There are 6 spring on the each lower side of the cylinder and 3 spring on each upper side of the cylinder totalling 18 spring for both the ends.
The unbalance Vibro motor used has a centrifugal force of 90,000 N and vibrates at
25 Hz with an amplitude of around 5 mm.
This centrifugal force produces 10 G force in the vibro finishing mill.
Please advise.
Regards and Thanks
Attachments
vibro finishing mill (JPG)
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