Fmc Corporation

Robert E Kraft

Arthur L Dean

Kenneth M Marshall

An electromagnetic vibratory exciter having a non-linear elastomeric compression spring mounted in four quadrants around an electromagnet. The spring having curved armature contact surfaces of different heights on laterally opposite adjacent quadrants for providing selectable non-linear stiffening and deflection rates.

Electromagnetic vibratory exciter

An elastomeric compression element for an electromagnetic exciter unit which has a generally semi-circular outer periphery, an elongate inner periphery, end portions merging the inner and outer peripheries, a planar base surface and a contoured contact surface. The central portion of the element is dimensioned to have a height and thickness greater than that at the end portions for providing a non-linear spring action with the reciprocating free mass inside the unit during electromagnetic conduction.

An electromagnetic vibratory exciter for use in vibratory equipment incorporates a free mass housed in an elongate housing having electromagnets mounted inboard at each end of the housing. The free mass is totally enclosed and carries a pair of armatures for cooperation with the electromagnets. An air gap is maintained during operation between the electromagnets and the armatures through the use of compression elements interposed between the electromagnet housing and the armatures of the free mass.

An electromagnetic vibrating exciter for use in vibratory equipment incorporates a free non mass housed in an elongated housing having electromagnets mounted inboard at each end of the housing. The free mass is totally enclosed and carries a pair of armatures for cooperation with the electromagnets. An airgap is maintained during operation between the electromagnet and the armatures through the use of compression elements interposed between the electromagent housing and the armature of the free mass.

A vibrating machine, such as an oscillating conveyor, vibratory feeder, or vibratory screen, is mounted to a plurality of supports by a suspension that isolates machine vibrations from the supports. The suspension includes a plurality of U-shaped stirrups extending transversely beneath the machine at intervals spaced longitudinally of the machine. Each U-shaped stirrup extends between a pair of opposed supports to which the stirrup is mounted for pivotal movement about an axis of rotation that extends transversely of the vibrating machine. This axis of rotation is along or near the axis of the instantaneous center of rotation of the stirrup. The stirrups support the vibrating machine at surfaces spaced below the axis of rotation. These stirrup surfaces are located to intersect an axis passing through the region of the center of percussion of the stirrup about the axis of rotation. Vibrations in a direction longitudinal of the vibrating machine impart a rotational motion to each stirrup. Thus, such vibrations are not transmitted to the supports. In a preferred embodiment, resilient bushings are fitted within the U-shaped stirrups coaxial with their axis of rotation, and vibration dampening resilient means are provided for mounting the vibrating machine upon the stirrups.

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Indiana, PA, United States of America

Robert E Kraft