Material or article handling – Static receptacle and means for charging or discharging – or... – Nongravity discharging means
Patent
1991-12-23
1993-05-18
Bucci, David A.
Material or article handling
Static receptacle and means for charging or discharging, or...
Nongravity discharging means
222200, 222404, B65G 6548
Patent
active
052115240
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an apparatus for discharging fine material, such as fiber stock, wood chips or sawdust from a silo or a similar device via an aperture or apertures in the bottom of the silo.
BACKGROUND OF THE INVENTION
Some prior art solutions for discharging material from the bottom of a silo employ a transport screw turning about the center axis of the silo and extending radially from the wall of the silo to a discharge opening in the center of the bottom. The turning movement can be brought about for example, as disclosed in Finnish patent specification no. 51325, by a hydraulic device disposed at the outer end of the transport screw and communicating with a geared step ring provided outside the silo.
Other prior art solutions for discharging material from the bottom of a silo have discharge arms fixed to a drive shaft disposed centrally in the silo which arms are arranged to move material to a discharge opening or openings of the silo while the shaft rotates. The discharge arms are arranged to be rotated continuously to the same direction or to be moved to and fro by a motor or a hydraulic device. An example of this kind of an apparatus is disclosed in Finnish patent specification no. 47328.
Finnish patent application no. FI 881926 discloses a discharge apparatus for a silo, comprising a double-ended discharge arm pivoted in an excentric pin of a drive shaft disposed centrally in the silo. The movement of the discharge arms is controlled by pins provided at the ends of the discharge arms and by pins disposed at the bottom portion of the silo by means of which rollers are caused to move, when the drive shaft rotates, along a substantially epicycloidal path around the pins thus forcing the discharge arm in a slow "sawing" turning movement.
DISCLOSURE OF THE INVENTION
The object of the invention is to provide an improvement in apparatus having a discharge arm or arms disposed rotatable about the center axis and to move along the bottom of a silo.
An apparatus according to the invention is mainly characterized in that the discharge arm is double-ended and that the movement of the discharge arm is guided by means provided in the ends of the arm and by counter surfaces disposed in the silo and by two cylinders acting on the center of the discharge arm and being disposed substantially perpendicular in relation to each other, so as to move the ends of the arm alternately in the peripheral direction.
In a preferred embodiment of the invention the cylinders are arranged to operate alternately in such a way that one of the cylinders is hydraulically locked with the piston arm in the retracted position or in the extended position while the other cylinder performs a pushing or a pulling motion. The ends of the arm are preferably provided with rollers moving at the outer side of projections from one space between the projections to another, the projections being disposed at the bottom edge of a skirt connected to the wall of the silo.
The most important advantage provided by the discharger of the invention is that the drive means of the discharger is remarkably cheaper than the prior art rotating means. As no rotatable drive shaft is needed also the devices required for bearings, lead-through and sealing of the shaft and for transmission of the torque are dispenced with.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in more detail, by way of example, with reference to the accompanying drawings in which
FIG. 1 is a plan view of an embodiment of the invention;
FIG. 2 is a section along line A--A of FIG. 1;
FIG. 3 is a section along line B--B of FIG. 1; and
FIG. 4 is a section along line C--C of FIG. 1.
DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENT
In the figures which illustrate a typical structure according to the invention, the reference numeral 1 refers to a bottom portion of a silo having a cylindrical wall 2 and a planar bottom 3, the bottom having two discharge apertures 4. A skirt 5 is connected to the wall 2 the lower edge of which skirt i
REFERENCES:
patent: 1033854 (1912-07-01), Werk
patent: 1429925 (1922-09-01), Cardlot
patent: 1730784 (1929-10-01), Rogginger
patent: 2471495 (1949-05-01), Pfau
patent: 2755942 (1956-07-01), Broberg
patent: 3197084 (1965-07-01), Von der Lely et al.
patent: 3203703 (1965-08-01), Van der Lely et al.
patent: 3229665 (1966-01-01), Baltz
patent: 3874566 (1975-04-01), Miksitz
patent: 4003481 (1977-01-01), Proctor
patent: 4095703 (1978-06-01), Weaver
patent: 4099633 (1978-07-01), Cantenot
patent: 4979861 (1990-12-01), Kilpelainen et al.
Bucci David A.
Kone Wood Oy
LandOfFree
Discharge apparatus for a silo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Discharge apparatus for a silo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discharge apparatus for a silo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-800230