Material or article handling – Static receptacle and means for charging or discharging – or... – Nongravity discharging means
Patent
1989-11-30
1992-01-21
Werner, Frank E.
Material or article handling
Static receptacle and means for charging or discharging, or...
Nongravity discharging means
222411, 222413, 198778, 414325, B65G 6540
Patent
active
050824147
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL DOMAIN
The invention relates to a device for extracting a material in particle form, i.e. pulverulent or granular, from a reservoir, particularly a silo.
The technical domain concerned is that of the mechanical extraction of such materials from an extraction member of helicoidal type.
PRIOR ART
The prior art knows two families of such extraction members.
The first family relates to devices comprising at least one rigid screw disposed, at least partially, parallel to the bottom or to the base of a reservoir. The screw is animated by a movement of rotation on itself and by an angular sweeping displacement about an axis, generally perpendicular to the plane of the bottom or the base.
Extraction is effected by entrainment and evacuation of the product in the direction of an outlet occupying, most often, the center of the bottom.
The devices of this family do not give entire satisfaction for different reasons. They are generally expensive to buy and maintain and represent cumbersome structures. The screw constitutes a rigid member comprising a core, of appreciable section, constituting a brake to the progression of angular displacement within the mass of material. The rigid structure of the screw and its section require the application of a driving torque of high value, as soon as rotation starts and, consequently, the employment of expensive high-power motorization means. The means for supporting the screw, necessarily employed, results in the screw being placed at a distance from the bottom or base of the reservoir. The screw is thus incapable of scraping a minimum layer of product which permanently remains on the bottom of the reservoir. Moreover, a rigid screw, due to its structure, does not make it possible to furnish variable dosages below a determined minimum dosage.
The second family concerns devices comprising an extractor member in the form of a helicoidal filiform winding; a winding of a thin, rod-like element. The object of the invention specifically relates to the devices of this second family.
The prior art furnishes several propositions for producing extractor devices relating to this second family.
One of them is taught by Patent FR 1 376 898 providing a storage enclosure comprising, at a distance from the bottom, a rectilinear, helicoidal, filiform winding occupying a fixed position and driven in rotation on its axis. Such a device presents the drawback of not being able to be adapted to reservoirs of cylindrical shape, generally retained for storing pulverulent or granular products or materials. Another drawback of this device resides in the impossibility of extracting all the mass of products or materials from the reservoir, due to the establishment and support of the winding at a distance from the bottom.
Another proposition has been made by Application EP-A-0 016 685 providing to arrange a peripheral annular groove open in the flat bottom of a reservoir. A helicoidal filiform winding is housed in the groove in which it may be animated by a rotation on its axis by a driving member fitted at one of its ends. The filiform winding according to this teaching performs in fact only a function of take-up as the extraction proper is ensured by a scraper rotating in a plane parallel to the bottom of the reservoir.
Such a device employs two distinct scraping/extracting and drawing-off means requiring two means for driving in rotation and two monitoring and servocontrol systems. In addition, such a device has for a drawback to leave on the flat bottom of the reservoir a layer or cake of products or materials whose thickness is equal to the distance separating the bottom from the plane of rotation of the rotating scraper.
Application DE-A- 19 19 698 should also be mentioned, providing extending the truncated bottom of a reservoir by a bent conduit in which is disposed a helicoidal filiform winding moved in rotation on its axis. The terminal part of the winding rises substantially vertically inside the truncated bottom occupied by the product or material in particle form.
Such a device pres
REFERENCES:
patent: 3707224 (1972-12-01), Rastoin
patent: 3817407 (1974-06-01), Cantenot
patent: 4291647 (1981-09-01), Legrain
patent: 4512502 (1985-04-01), Landers
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