For the simple harmonic motion to cause a mass or
object to move in one direction, its line of action is
pitched upward from the conveying surface, to impart
a trajectory effect. The mass, or object, moves along
the surface in a series of short trajectories, as shown
in Fig. 1. Optimum operating conditions, in terms of
amplitude, frequency and pitching angle, have been
developed for water-quenched ash through trial and
error, and will be described later in this paper.
The differential velocity motion, having different
mean velocities and peak accelerations through each
half of a cycle, through differential friction can cause
movement of the mass or object in the direction of the
lower mean velocity. The line of action may be parallel
to the conveying surface; the mass, or object, will slide
along the surface in a series of "slip-stick" sequences,
as shown in Fig. 2.
All the differences in design and performance between
the vibrating conveyor and the horizontal differential
conveyor stem from the differences in the kind