Portable screening plant with displaceable eccentric
AssigneeOhio Central Steel Company
InventorsDouglas J. Cohen, Mauricio A. Escobar
Life of this patent
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Abstract
A vibration-reducing eccentric weight system mounted to the driveshaft of a screen box in a portable screening plant with the eccentric weight system's center of gravity on the driveshaft's axis of rotation. The eccentric weight system includes a weight that is radially slidably mounted to the driveshaft, but biased so that its center of gravity is spaced from the driveshaft's axis of rotation during slow and no rotation. Upon rotation above a preselected speed, the centrifugal force displaces the weight radially outwardly. This causes a gradually increasing vibration corresponding to gradually increasing distance between the weight's center of gravity and the driveshaft's axis of rotation.
Claims12
A portable screening plant having a screen that screens particulate matter positioned thereon, the screening plant comprising:
- (a) a housing to which the screen is mounted;
- (b) a prime mover mounted to the housing;
- (c) a pair of endless tracks mounted to the housing and having surfaces for seating against a ground upon which the screening plant rests, the tracks being drivingly linked to the prime mover for driving the tracks along the ground;
- (d) a driveshaft drivingly linked to the prime mover and rotatably mounted to the screening plant;
- (e) a weight having its center of gravity spaced from the driveshaft's axis of rotation, said weight being radially movably mounted to the driveshaft for moving radially outwardly under centrifugal force during rotation of the driveshaft at a rate greater than a preselected rate to form an eccentric that causes the driveshaft, and the screen mounted thereto, to vibrate;
- (f) at least one bias connected to the driveshaft and the weight, said bias biasing the weight's center of gravity toward closer proximity to the driveshaft's axis of rotation for returning the weight to a rest position when the driveshaft is rotating is at a rate less than a preselected rate;
- and
- (g) a plate rigidly mounted to the driveshaft and to which the weight is radially movably mounted.
A portable screening plant having a screen that screens particulate matter positioned thereon, the screening plant comprising:
- (a) a housing to which the screen is mounted;
- (b) a prime mover mounted to the housing;
- (c) a pair of endless tracks mounted to the housing and having surfaces for seating against a ground upon which the screening plant rests, the tracks being drivingly linked to the prime mover for driving the tracks along the ground;
- (d) a driveshaft drivingly linked to the motor and rotatably mounted to the screening plant;
- (e) a plate rigidly mounted to the driveshaft;
- (f) a radially displaceable weight having a finger mounted within a radial slot formed in the plate;
- and
- (g) at least one bias mounted to the plate and the weight for biasing the weight's center of gravity toward closer proximity to the driveshaft's axis of rotation;
- wherein an eccentric weight system's center of gravity is aligned substantially along the driveahaft's axis of rotation when the driveshaft is rotating at a rate less than a preselected rate, and is spaced from the driveshaft's axis of rotation when the driveshaft is rotating at a rate greater than a preselected rate.
A portable screening plant having a screen that screens particulate matter positioned thereon, the screening plant comprising:
- (a) a housing to which the screen is mounted;
- (b) a prime mover mounted to the housing;
- (c) means for conveying the screening plant from a first location to a second location;
- (d) a driveshaft drivingly linked to the prime mover and rotatably mounted to the screening plant;
- (e) a weight having its center of gravity spaced from the driveshaft's axis of rotation, said weight being radially movably mounted to the driveshaft for moving radially outwardly under centrifugal force during rotation of the driveshaft at a rate greater than a preselected rate to form an eccentric that causes the driveshaft, and the screen mounted thereto, to vibrate;
- (f) at least one bias connected to the driveshaft and the weight, said bias biasing the weight's center of gravity toward closer proximity to the driveshaft's axis of rotation for returning the weight to a rest position when the driveshaft is rotating at a rate less than a preselected rate;
- and
- (g) a plate rigidly mounted to the driveshaft and to which the weight is radially moveably mounted.
Dependencies are inferred from the claim text.