Conveyors: power-driven – Conveyor section – Thrower
Patent
1996-10-01
1998-09-01
Bidwell, James R.
Conveyors: power-driven
Conveyor section
Thrower
414208, 414301, B65G 3104
Patent
active
057997772
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for the distribution of materials in bulk using a revolving chute with a variable angle of inclination. More particularly, it relates to a device for the distribution of materials in bulk comprising a delivery chute for materials in bulk, a first rotor with a substantially vertical rotation axis, the chute being suspended from the said first rotor so as to be able to pivot around a substantially horizontal pivoting axis; and a second rotor with a rotation axis substantially coaxial with the said first rotor.
Such devices for the distribution of materials in bulk are used for example in charging devices for shaft furnaces, particularly blast furnaces. The chute then provides for the distribution of the charging material over the surface of the charge inside the shaft furnace.
In the device described in the preamble, the first rotor essentially imposes a rotation on the chute about a vertical axis. The second rotor interacts with the chute in such a way as to determine its angle of inclination with respect to the vertical. For this purpose, the second rotor is connected to the chute by a pivoting mechanism transforming a variation in the angular offset between the two rotors into a variation in the angle of inclination of the chute in its vertical pivoting plane.
Different variants in implementation have been proposed for this pivoting mechanism, which generates the moment necessary to pivot the chute around its horizontal pivoting axis and which transmits this moment to the chute.
The document U.S. Pat. No. 3,766,868 proposes a device of the type described in the preamble in which a rod located in the pivoting plane of the chute is articulated with one end on the rear surface of the chute. The other end of this rod is guided in a sinusoidal guide path of the second rotor.
The document U.S. Pat. No. 3,814,403 proposes a device of the type described in the preamble in which the second rotor forms a gear ring coaxial with the vertical rotation axis. This gear ring drives, through a first pinion, an endless screw which acts, through a second pinion, on a toothed sector. The latter is fixed laterally on to a suspension bearing for the chute.
The document U.S. Pat. No. 4,368,813 proposes a device of the type described in the preamble in which the rotor also comprises a gear ring coaxial with the vertical rotation axis of the chute. This gear ring co-operates with an input gear, with vertical axis, of a connecting rod and crank mechanism supported by the first rotor. The connecting rod of this mechanism is contained in the pivoting plane of the chute and is articulated with its free end on the rear surface of the chute.
The document U.S. Pat. No. 4,941,792 proposes two implementations of a device of the type described in the preamble. In a first implementation, a pivoting lever supported by the first rotor is used so that it can pivot in the pivoting plane of the chute. This pivoting lever is connected through a rod with ball and socket joints to the second rotor. The chute comprises two lateral suspension bearings each fitted with a crank. A forked rod (a stirrup) connects the pivoting rod to the two cranks of the chute. In a second implementation the second rotor supports a toothed annular segment which co-operates with a toothed sector attached to a lateral suspension bearing of the chute.
The document U.S. Pat. No. 5,002,806 proposes a device of the type described in the preamble, in which the second rotor is connected to a crank which is attached to a lateral suspension bearing of the chute by means of a rod with ball and socket joints.
The document U.S. Pat. No. 5,022,806 proposes a device of the type described in the preamble, in which the chute comprises a lateral arm which slides in a guide channel with the help of an articulated foot on this arm. This guide channel is defined by a curved element supported by the second rotor. The centre of curvature of the curved element defining the guide channel is located at the point of intersection of the pivoting axis and t
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Bernard Gilbert
Lonardi Emile
Mailliet Pierre
Bidwell James R.
Paul Wurth S.A.
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