Agriweld designs balancing system for Haulm Topper
A
Schmitt Europe product story
Edited by the Engineeringtalk editorial team
Dec 17, 2008
Agriweld, a manufacturer of agricultural machinery, recently won a contract to make the Grimme type KS-6000 Three Bed Folding Haulm Topper.
This led Agriweld to develop a dynamic balancing process and to buy a Schmitt Balance Systems (SBS) SB-1700 portable balancer.
The Haulm Topper removes the foliage (haulm) from the top of a potato plant, which stunts growth and matures the tuber before it is picked.
A PTO (Power Take Off) on the back of a tractor drives a high speed rotor inside the topper at 1300RPM, rotating the blade which removes the haulm.
The high rotational velocity, welding operations during manufacture and non-symmetrical geometry of each rotor means they are inherently out of balance, leading to a potential dynamic couple effect when in operation.
This dynamic unbalance can cause excessive vibration of the rotors, leading to early component failure.
With consultation from Schmitt Europe, Agriweld designed and manufactured a bespoke balancing machine to be used with the SB-1700 instrumentation.
This included a machine base, pedestals, a belt driven spindle and an inverter/ motor combination on which to mount and drive each rotor.
Interlocked guarding protects the operator and a quick release system allows rotors to be quickly installed and removed.
Agriweld also developed a process to minimise rotor run-out prior to balancing.
A water purging welding fixture built by Agriweld pumps cold water into a coupling and then through the seamless tube of each rotor.
While this is happening, lugs and shafts are welded on.
This removes heat and minimises distortion during welding, reducing the potential run-out when the rotor is ready for balancing.
This proprietary water purging process has reduced run-out.
The Schmitt SB-1700 portable balancer can measure and correct unbalance in one or two planes and can measure vibration on components rotating from 300 to 60,000RPM.
It uses a laser speed sensor that can measure up to two metres from the rotor.
It also uses two magnetically mounted accelerometers, one placed on each of the pedestals, to pick up vibration on each end of the component.
The speed and vibration inputs and a known test-mass allow the unit to tell Agriweld how much and at which angle weight must be added or removed to compensate for unbalance in the rotors.
In this case, mass is added by welding steel weights to the rotor.
The SB-1700 instrument can be used for balancing most rotating machinery, including fans, impellers, pumps, electric motors, high speed spindles or grinding wheels.
The firmware in the instrument includes calculations for split weight, combine weights, interrupted radius, drill depth calculator and an ISO-1940 limits calculator, which determines the maximum permitted unbalance level when working with ISO standard G grades.
Vibration monitoring and analysis software is also included as standard.
The SB-1700 permits quick measurement of a broadband vibration spectrum, aiding balancing problem solving.
Balancing reports for up to 200 rotors or machines can be saved and uploaded to any PC running MS Windows.
The unit can be powered from the mains or through its built-in Ni-Cad battery pack, which provides up to nine hours of operating life.
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Contact Schmitt Europe
Tel +44 24 7669 7192
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