Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or...
Patent
1991-05-09
1994-04-12
Bushey, Charles S.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
100145, 425149, 425203, 425205, 425208, 4253781, 425461, B29C 4700
Patent
active
053021029
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns equipment defined in the preamble of claim 1 for briqueting plants, especially stalk-plant materials.
BACKGROUND OF THE INVENTION
The German Offenlegungsschrift 34 22 658 discloses straw briqueting equipment with a screw compactor of which the driven, rotating screw evinces an outer contour at its front end, as seen in the direction of advance, determined by two screw coils away from a conical screw core. The conical segment of the otherwise cylindrical screw enters a conical compaction space of a screw housing entered by the cantilevered worm. A hopper feeding the straw to be briqueted is mounted above the cylindrical part of the screw and said straw is compacted by said rotating screw in the conical screw segment and is expelled through a discharge opening at the tapered end of the conical surface of the screw housing. The pressure of the conical screw compactor can be controlled by a tubular, cross-sectionally adjustable punch adjoining the discharge of the conical surface.
The straw to be briqueted is highly compressed by the pressure from the conical screw compactor and heats up in this process and on account of its lignin content cakes into a straw cake which even when hot flows only poorly. Because accumulation may take place especially at the transition from the inner cone of the screw housing to the cavity, whereby the discharge aperture of the conical worm compactor would clog, an axially displaceable plunger is mounted in the screw of the German Offenlegungsschrift 34 22 658 to periodically expel the accumulating compacted straw into the cavity. However it has been found that the straw lignin not only makes possible briqueting, but also bonds the plunger guided displaceably in the screw to this screw until it can no longer move. The known equipment therefore can be operated only during comparatively short intervals before requiring disassembly and cleaning.
The object of the invention is to create equipment of the species in such manner that continuous operation unlikely to incur malfunctions shall be achieved.
This problem is solved by the features of present invention.
SUMMARY OF THE INVENTION
The invention starts with a guide strip mounted on the inside conical surface of the screw housing of the known equipment and projecting toward the screw. In the known equipment, several guide strips are present on the conical inside surface and extend in the axial direction of the screw, to prevent rotation of the straw cake during compaction. The invention deviates from this principle and permits rotation of the straw cake in the conical screw compactor. The guide strip encloses the screw in the form of a conical coil of which the winding direction is opposite the winding direction of the screw, whereby the guide strip drives the rotating straw cake in screwing manner toward the discharge opening of the inner cone of the screw housing and assures uniform evacuation toward the die. The press punch or the like provided in the known equipment therefore may be eliminated.
The expression "guide strip" herein means an elongated component capable of acting like a screw in the direction of conveyance on the rotating stalk materials to be compacted. The component in particular may assume the shape of a rib or a bridge illustratively integrated into the screw housing or being created in it by suitable grooves.
The equipment of the invention is suitable for briqueting plant-materials of all kinds and consistency, in particular also wood wastes such a chips and saw dust; but especially this equipment is used for briqueting stalk plants, especially dry goods such as straw.
As a rule the inner conical surface of the screw housing extends in the direction of conveyance of the screw beyond the screw. In this manner there remains in the screw housing and in front of the screw a tapering chamber through which the screw's pressure must force the already compacted straw. This is substantially facilitated if the guide strip extends as far as the region of the inner conic
REFERENCES:
patent: 1353917 (1920-09-01), Lambert
patent: 1467737 (1923-09-01), Schueler
patent: 1577015 (1926-03-01), Glaze
patent: 2026439 (1935-12-01), Sanial
patent: 2547151 (1951-04-01), Braeseke
patent: 2943012 (1960-06-01), Dunning et al.
patent: 2977873 (1961-04-01), Crane
patent: 2984173 (1961-05-01), Roche
patent: 3034424 (1962-05-01), Zies
patent: 3044391 (1962-07-01), Pellett
patent: 3102716 (1963-09-01), Frenkel
patent: 3126820 (1964-03-01), Upton
patent: 3323444 (1967-06-01), Mark
patent: 3956981 (1976-05-01), Pitt
patent: 4632795 (1986-12-01), Huber et al.
patent: 4698006 (1987-10-01), Ralphs
Patent Abstracts of Japan, vol. 6, No. 210, Oct. 1982.
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