Conveyors: power-driven – Conveyor having means specialized for collecting a load from... – Power-driven feed means
Patent
1986-09-26
1988-01-05
McCall, James T.
Conveyors: power-driven
Conveyor having means specialized for collecting a load from...
Power-driven feed means
198662, 198658, B65G 6516
Patent
active
047170140
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a screw conveyor for bulk material. Such screw conveyors have a housing and a conveyor screw mounted therein, said housing and said conveyor screw being relatively rotatable. Usually, the housing is stationary and the conveyor screw is rotatable within the housing. In order to promote the supply of material into the screw conveyor, various types of feeder devices have been proposed. Examples of such feeder devices are those disclosed in U.S. Pat. No. 3,596,751 and European patent specification EP-A-57,167. These devices are of the type in which the screw and the feeder device are rotated in opposite directions. The object of the feeder device is to positively supply the material into the screw, such that the screw can efficiently grab and convey the material through the screw conveyor.
Although the known feeder devices have proved highly efficient, there is room for improvements. Frequently, these devices are such that they cannot operate efficiently if the screw conveyor is inclined relative to the vertical plane. Since such screw conveyors often are included in an unloader for the unloading of, for example, ships, it is essential that the operator be able to incline the conveyor such that it can reach right into the corners and underneath the hatch edges of the ship's hold. At the same time, it should be possible to unload the material as completely as possible also in these difficultly accessible spots, thereby to reduce the need for special equipment to clean these spots and to move the material within reach of the screw conveyor or the unloading device.
The arrangement according to European patent specification EP-A-57,167 comprises a feeder wing in the form of a planar helix, as a result of which the feeder device can operate efficiently only when it is directed exactly vertically so that the planar helix sweeps across the bottom of the hold. The commercially available practical embodiments of the feeder device according to the U.S. Pat. No. 3,596,751 are better in this respect since they function fairly well also when the vertical conveyor is inclined. However, also this type of feeder device has tended to leave material behind and to thump mechanically against the bottom of the hold.
SUMMARY OF THE INVENTION
The present invention aims at providing a screw conveyor which is superior to prior art constructions in that it operates satisfactorily and is subjected to a lesser degree to mechanical strain when the screw conveyor is inclined. To this end, the screw conveyor according to the invention is designed in the manner defined by the appended claims.
The invention will be described in more detail below, reference being had to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1-7 are different views of the feeder device proper of the screw conveyor, FIGS. 1, 2, 3, 5, and 4 in that order being respective views at successive rotation angles of the feeder device, as indicated by arrows I to V in FIG. 6, FIGS. 6 and 7 being views from different tilted angles.
FIG. 8 illustrates an example of a metal plate or sheet in planar form which may be used for making a blade in a screw conveyor feeder device according to the invention.
FIG. 9 illustrates an example of a complete screw conveyor equipped with a feeder device according to the invention.
DESCRIPTION OF PREFERRED EMBODIMENTS
FIG. 9 illustrates a ship unloading device 1, a screw conveyor 2 and feeder device 3 according to the present invention. Generally, the ship unloading device is constructed according to the U.S. Pat. No. 4,020,953. In this patent the ship unloader has a feeder of the type which constitutes the subject matter of U.S. Pat. No. 3,596,751 but which is to be replaced by a feeder device 3 according to FIGS. 1-7 in order to become a screw conveyor according to the present invention. The feeder device 3 according to FIGS. 1-7 has a tubular portion 10 surrounding the outer side of the screw conveyor housing 4, and the conveyor screw (not shown) extends d
REFERENCES:
patent: 2467682 (1949-04-01), Megargee
patent: 2709075 (1955-05-01), August
patent: 3019895 (1962-02-01), Lovenstein et al.
patent: 3596751 (1971-08-01), Siwersson et al.
patent: 3685638 (1972-08-01), Siwersson et al.
patent: 4467910 (1984-08-01), Siwersson et al.
patent: 4492302 (1985-01-01), Svens
AB Siwertell
McCall James T.
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