Typical drives for process technologies:
The slider-crank drive comprises two components: the connecting rod and the eccentric shaft. The connecting rod is mounted on the eccentric shaft. The connecting rod head is flexibly-mounted to the utility weight or rather the conveyor trough. The eccentric shaft is mounted on the counter-weight, i.e. the foundation.
Variations: Small vibrating machines with slider-crank mechanisms are designed as guided one-mass systems.
Larger vibrating machines have larger dynamic forces and are thus constructed as two-mass systems. These are predominantly designed as so-called resonance systems. This keeps the forces in the connecting rod and elastic coupler element low.
Application: For example, in vibrating conveyor systems with a Schenck Process slider-crank mechanism. They are especially ideal due to the fact that they can smoothly convey bulk materials, from sand to coarse materials. These drives are also used for longer conveying distances. For transporting castings and sand in foundries or transporting slag in waste incineration plants.
Unbalance motors are rotary machines with a shaft to which adjustable weights are fixed. They use the arising centrifugal forces for circular mechanical vibrations.
Application: Unbalance drives are used for vibrating conveyors, vibrating screens, vibrating cleaning equipment, vibrating compressors, vibrating road rollers, vibrating plates or vibrating alarms in mobile phones. Silos for bulk material are fitted, for example, with unbalance motors to improve bulk material flow.
Schenck Process conveying troughs can be driven either by unbalance motors or force exciters. Besides transporting bulk materials, they are also used for collecting and diverting product flows, sorting cast parts and feeding process machines such as screens, coolers, etc.
Rotary force exciter cell
The unbalance masses of the rotary force exciter cell rotate around the exciter cell axis and produce centrifugal forces, the vector of which rotates with operating frequency. The centrifugal force can be varied when stationary by integrating additional masses.
To drive a circular vibrating screen, an exciter cell is flanged to both of the side panels. The two exciter cells are joined together by an intermediate drive shaft.
Both vibrating screen exciter cells are driven by a stationary standard electric motor via a drive shaft.
In the case of circular vibrating screens, screened material can only be conveyed by angling the screen.
Structure: The oil-lubricated exciter cell consists of the bearing housing, two roller bearings, a shaft, two unbalance masses and the seal.
There is much to be said for the rotary force exciter cell: The cells can be easily exchanged for replacement impulse cells thanks to the compact design. The supports do not need be changed on-site. Unlike with shaft drives mounted in the side panels, long production downtimes are avoided.
Frequency inverters can be used to continuously vary the centrifugal force.
Rotary force exciter cells are, for example, used to drive circular vibrating screens. With paired arrangements, linear vibrating screens and separator systems can be operated in foundries.
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