| 摘要 |
<p>In a method for compacting a granular, loosely coherent mass, such as moist mortar, to obtain end products such as paving stones, kerbstones and the like, an installation is used which comprises a vibrating table (1) as well as a mould (13) for the mass to be compacted, a stamp (14) for pressing the mass into the mould (13), a hydraulic exciter (3) and a hydraulic pressure (5,6) element connected to vibrating table (1) or stamp (4), drive means plus control means (11) for controlling exciter (3) and pressure element (5,6). The method comprises the following steps: selection of a frequency range with a lower value and an upper value for the excitation frequency, control of the excitation frequency such that it passes through at least part of said frequency range and that the natural frequency of the hydraulic-mechanical mass spring system formed by the movable part (2) of the exciter (3), the vibrating table (1), the mould (13) and the mass (17) to be compacted, as well as the compressible hydraulic medium present between the movable part (2) of the exciter (3) and the drive means concerned (7), is reached. <IMAGE></p> |
