Compressing device for performing compression operations on shaped bodies made of grainy materials

Device for the compaction of granular materials to form mouldings (108) by the introduction of essentially harmonic vibrational forces, with

• an oscillatable mass/spring system (136) with one or more characteristic frequencies, comprising a main system spring (150, 970) for continuous conversion between kinetic energy of the mass/spring system (136) and spring energy, and a mass which has an oscillating table (124), on which the spring force of the main system spring (150, 970) acts, and a mould (106) connected firmly to the oscillating table (124) at least during compaction and intended for receiving the mouldings (108),
• an exciting device (144) which is adjustable in terms of its exciting frequency, with an exciting actuator for exciting the mass/spring system (136) to forced oscillations, from which the vibrational forces can be derived,
• the exciting force generated by the exciting actuator acting on the oscillating table (124), and the exciting frequency for the oscillations being either at the characteristic frequency or in the vicinity of the latter or being adjustable through a frequency range within which at least one characteristic frequency lies,
• a control (190) for controlling or regulating the exciting-device (144),
• a press plate (110) for acting with force upon the mouldings (108) in the mould (106),
• the forces transmitted by the press plate (110), on the one hand, and the forces transmitted by the main system spring (150, 970), on the other hand, being supported relative to a frame (100), through which forces involved in the compaction are led along a closed force-flux path,
• characterized
• in that the exciting actuator (144) and the main system spring (150, 970) are designed to be separate from one another and the force-flux paths of the exciting force and of the spring force run at least partially separately, the system spring (150, 970) being designed as a single mechanical spring or as a resultant spring composed of a plurality of mechanical individual springs.