Screw press with radial gate valve and supported screw shaft

Details Screw press with radial gate valve and supported screw shaft Screw press with radial gate valve and supported screw shaft

2006-12-26

2006-12-26

Larson, Lowell A. (Department: 3725)

Presses

With drain means for expressed liquid

Drainage through or along pressure surface

C100S126000, C100S148000, C100S150000

Reexamination Certificate

active

07152522

ABSTRACT:
A screw press is provided having a radial gate valve and supported longitudinally-extending screw shaft. The screw shaft includes a central shaft and helical threads which is driven by a drive package. The screw shaft is encapsulated within a housing including a hopper portion, transition portion, bearing portion and screen portion. A transition portion includes a radial gate valve which is angled such that the radial gate valve's axis of rotation is substantially parallel to the screw shaft threads. In addition, the screw shaft is supported by a first support at its proximal extremity and a second support towards its distal extremity. The support at its distal extremity includes one or more wear bearings which concentrically support the threads of the screw shaft in a frictional engagement manner. In operation, semi-solid materials are introduced to the screw press through the hopper portion inlet. Material is conveyed through the housing by rotation of the screw shaft until material collects within the screen portion. Material within the screen portion is compressed to force liquid through the screen mesh openings. Back flow of material is prevented by a radial gate valve. The angle of the radial gate valve with respect to the screw presses housing provides for greater pressure build up within the screen portion.

REFERENCES:
patent: 178647 (1876-06-01), Lafferty
patent: 1553976 (1925-09-01), Bernot et al.
patent: 4121967 (1978-10-01), Reinhall
patent: 4395331 (1983-07-01), Andersson
patent: 5012731 (1991-05-01), Maisonneuve
patent: 5715747 (1998-02-01), Fedon

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