Patent ID: 6054079
Filing Date: 2000-04-25
Classification: B28B,B30B

Abstract:
Method for the operation of a compacting installation for compacting a granular, loosely coherent mass in order to obtain end products which installation comprises a vibrating table as well as a mold for the mass to be compacted, a stamp for pressing the mass into the mold, a hydraulic exciter and a hydraulic pressure element connected to the vibrating table and the stamp, respectively, and drive and control means for controlling exciter and pressure element, which method comprises the following steps:selection of a frequency range with a lower value and an upper value for the excitation frequency, andcontrol of the excitation frequency such that it passes through at least part of said frequency range and reaches the natural frequency of the hydraulic-mechanical single mass-single spring system having a single mass formed by a movable part of the exciter, the vibrating table, the mold and the mass to be compacted, and a single spring formed by a compressible hydraulic medium present between the movable part of the exciter and the drive means concerned.