Lower guide bearing arrangement for twin screw mixer

Agitating – Rubber or heavy plastic working – Stirrer is through-pass screw conveyor

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308 3R, 308207R, 366100, 366287, 366292, B01F 700, B01F 708, B29B 106

Patent

active

044720602

ABSTRACT:
A lower guide bearing arrangement for twin screw mixer of the nauta-type wherein the mixing chamber is comprised of an inverted, truncated cone housing a pair of screws supported at their upper ends from the ends of a swing or orbit arm which rotates at a relatively slow speed, the lower ends of the screws being received in guide bearing arrangements mounted on a support member which rotates at the same speed as the orbit arm. Means are provided to drive the screws 15 at a relatively high speed depending on the mixing requirements.
Each lower guide bearing arrangement for the screws of the twin screw mixer is comprised of a shaft mounted on the lower support member, the shaft being received within a bearing housing containing a spherical roller bearing. The housing has a driving engagement with a load ring attached to the lower end of the screw. This driving engagement is achieved by means of a linear sleeve bearing manufactured of a nylon-like material.
The bearing housing, load ring and screw all rotate at the same speed, the load ring being fastened to the screw and the bearing housing being driven via the linear bearing sleeve. This arrangement of spherical roller ring and linear sleeve bearing readily accommodates those deflections of the screw, and manifested at the lower end thereof, occasioned by the forces and heat encountered during mixing; the result is a sort of "universal" guide bearing arrangement for the lower end of the screw as guided by the shaft upstanding from the bottom center support.

REFERENCES:
patent: 3612493 (1971-10-01), Nauta

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