Classifying – separating – and assorting solids – Sifting – Plane sifters
Patent
1975-07-31
1978-03-07
Halper, Robert
Classifying, separating, and assorting solids
Sifting
Plane sifters
209319, 2093665, 209363, 209385, 74 87, B07B 138
Patent
active
040778738
ABSTRACT:
A separator of the vibratory type comprising a box assembly of a plurality of planar pan screens resiliently suspended on a support base for vibratory motion thereon by resilient tension springs mounted between the box assembly and surrounding base truss members. The pan screens in the box assembly are formed of cylindrical sleeve frames and a circular screen having an elastomeric ring about its outer periphery with an external rim grooved to receive the lower edge of the superior sleeve frame. The pan screens are assembled into the box assembly by a plurality of tie rods disposed about the outer periphery of the box assembly to axially compress the assembly and screens into position and assure their support of material. The upper edge of each of the sleeve frames is deflected inwardly to telescopically receive the lower edge of the superior pan screen and effect radial deflection of the elastomeric ring of the superior pan screen when the assembly is compressed. The undersurface of the box assembly bears a center column which is positioned within a bearing shell, and the latter is coupled to a prime mover by a gyration isolating coupling which is formed by a pair of plates interconnected by a plurality of elastomeric bands which loop outwardly, radially and axially between the plate and which serve to isolate the horizontal and tilting motions from the drive system. Positioned between the center column and the isolation coupling is a gyration generator that comprises an eccentrically loaded bearing shell that receives the lower end of the center column in upper and lower bearing races and that bears eccentric weights on its outside surface to impart the desired gyration of the box assembly. The eccentricity of the weights on the bearing shell is fixedly adjustable to control the horizontal and vertical components of the gyration of the box assembly. The bearing shell has a bottom closure plate and serves as a lubricant reservoir to function with lubricant circulation system that includes a pitot tube mounted at the bottom inner periphery of the bearing shell to circulate lubricant through the system and lubricate the upper and lower bearing races. Individual pan screens may be provided with upper and under screen sweeps to deblind the screens.
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