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Case
study
Dynamic
Balancing
Abstract:
This case study describes the application of two-plane balancing to a
large coal crusher.
Method:
The standard two-plane Influence Coefficient method of balancing was used.
A reference reading was taken before any work was done. Trial weights were
attached in each plane and readings taken. Correction weights were then
calculated and attached to the rotor and a further reading was taken. Trim
weights were calculated and the balance condition checked.
Results:
The results of the balancing were as follows:
A
variation of approximately 0.3 mm/s was observed in the vibration level
and 15° in the phase readings. This indicates that some looseness was
present, probably because the machine was not secured to the floor.
A
total of 2.5 kg was added in plane A (non-drive side) and 3.1 kg in plane
B (drive side). The result indicated in the final run was considered
satisfactory.
Conclusions:
Dynamic balancing reduced the vibration to 30% of its initial value, to a
level where further reduction would have been difficult. The procedure
took less than two hours, and was conducted on the fully assembled machine
in the customers workshop.
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