Conveyors: fluid current – With diverse power-driven conveyor – Rotary
Patent
1986-07-21
1989-05-02
Basinger, Sherman D.
Conveyors: fluid current
With diverse power-driven conveyor
Rotary
406 73, 198674, B65G 5308
Patent
active
048263613
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for the transportation of flowable material in powder, particulate, lump, granular or pasty form in a feed pipe by means of a coaxial feeder screw and means for driving said screw which can be moved parallel to its axis in the forward and reverse direction. The forward movement is rotation-free, the return movement is accompanied by a forced rotational movement, as a result of which the material to be transported does not move in the axial direction on the return stroke.
In screw conveyors the impeller is the surface of a screw which is made of sheet, strip steel, or is machined out of solid material (seldom cast material), which is rotated about its axis and pushes the material to be transported forwards in a trough or pipe. Screw conveyors are described for example in the Handbook for Machine Construction by "Dubbel" (1981), pages 1154 and 1155, and also in the literature issued by numerous companies.
Conventional screw conveyors exhibit several disadvantages:
The pipe must not be filled completely, but only approximatively half-filled, otherwise blockage occurs. This means that the conveyance capacity per unit of cross-section is markedly reduced. Further, no difference i n pressure may be applied over the only half-filled screw conveyor.
The forward motion in the screw conveyor can only take place via relative movement between the screw blade and the contents.
Because of the small distance between the screw and the pipe wall, granules of the material being transported are broken.
The material to be transported is continually turned over.
The screw conveyor can be fed only by means of a measured feed facility as it may be no more than half-full.
The German Pat. No. 953 956 describes a screw conveyor for transporting loose material in a stream of counter-flowing fluid. The screw which is mounted such that it can rotate and be moved longitudinally is moved forwards and backwards. During the backward movement it is rotated in the sense of a forward movement of the material.
The desired, maximum possible mixing of the material and the counter flowing fluid is, according to the German Pat. No. 953 956, achieved in that:
the screw blades are interrupted,
bearings are mounted in the stream of flowing material, and
the trough containing the screw conveyor is not completely filled.
Described in U.S. Pat. No. 2,260,824 is likewise a screw conveyor which is mounted such that it can be rotated and moved longitudinally, and on the return movement is forceably rotated. The device is employed as equipment for feeding measured quantities.
The object of the present invention is to develop a device which is a type of screw conveyor that can be moved forwards and backwards and is forceably rotated during the return movement, said conveyor being for the transportation of flowing material, exhibiting a high feed capacity per unit cross section, requiring no measured feed facility and enabling a pressure difference to be produced over the length of the screw on application of a gaseous or liquid propellant.
This objective is achieved by way of the invention in that the feeder screw features no bearings or only bearings outside column of feed stock, the blades on the feeder screw are continuous and the distance of the feeder screw from the inner wall of the feed pipe is on all sides just larger than the average particle or lump size of the material being transported, whereupon in the presence of a pneumatic or hydraulic counter-pressure a compact, homogeneous column of material is produced.
With the feeder screw according to the invention a very dense column of material is produced; this is self-sealing over the whole length of the screw conveyor and also on being advanced in the pipe does not become loose. The counter pressure at the exit opening is usually around 6-8 bar.
The device with the feeder screw can be mounted horizontally, vertically or at any angle of choice. It is aligned automatically by the material in the feed pipe so that normally, thanks to the dense column, no bearings are
REFERENCES:
patent: 2260824 (1941-10-01), Bliss et al.
patent: 2541742 (1951-02-01), Booth
patent: 3310836 (1967-03-01), Nichols
patent: 3975058 (1976-08-01), York
patent: 4286935 (1981-09-01), Okuno et al.
patent: 4391561 (1983-06-01), Smith et al.
patent: 4473327 (1984-09-01), Delfs
Basinger Sherman D.
Salmon Paul E.
Swiss Aluminium Ltd.
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