摘要:
The invention relates to an improved compacting device for compacting a granular, loosely coherent mass, such as soil-moist cement, for producing end products such as tiles, kerbstones and the like. The compacting device comprises a vibrating table (1) and a hydraulic exciter device (63) for driving the vibrating table (1). The hydraulic exciter device (63) comprises a plurality of hydraulic exciters (3) and is configured to drive the hydraulic exciters with excitation displacements of mutually substantially the same amplitude and frequency and in phase with one another. The invention furthermore relates to an improved hydraulic exciter for use in the improved compacting device. The invention furthermore relates to the improved compacting device with a single improved exciter of this type.
摘要:
Vibrational energy generated with a pneumatic vibrator (22) is controlled to independently adjust the amplitude and the frequency. A mechanical resonator (14) is used to adjust the frequency. The controlled vibrational energy can be applied to equipment, such as a heat exchanger to mitigate fouling.
摘要:
The air-driven vibrator (10) includes a disc-shaped vibratory element (40) movably received in a disc-shaped working chamber (38). Upon injecting air jets into the chamber (38) through tangential injection ports (46), the element (40) is rotated and oscillated to generate vibration. The feature of the vibrator is that inwardly directed projections (66, 72) are provided on the inner end faces (34, 36) of the chamber (38) to prevent the element (40) from sticking to the end faces (34,36) when the vibrator is not in use. Due to the provision for the projections (66, 72), the edge of the element (40) need not be chamfered. This enables mass production of the elements (40) and increases the production yield of the elements (40).
摘要:
Die Erfindung betrifft eine Vorrichtung und ein Verfahren zum Erzeugen von Schlagimpulsen oder Schwingungen für eine Baumaschine, bei dem ein Kolben in einem Arbeitsraum in einem Gehäuse reversierend zwischen einem ersten Umkehrpunkt und einem zweiten Umkehrpunkt hin und her bewegt wird, wobei zum Erzeugen der Schlagimpulse beziehungsweise der Schwingungen der Kolben mittels eines Druckfluids in eine reversierende Bewegung versetzt wird und das Druckfluid im Bereich des ersten Umkehrpunktes und des zweiten Umkehrpunktes in den Arbeitsraum ein- und ausgeleitet wird. Nach der Erfindung ist vorgesehen, dass die Position des Kolbens mit einer Messeinrichtung erfasst wird, dass eine Steuereinheit abhängig von der erfassten Position des Kolbens mindestens ein steuerbares Ventil steuert, durch welches Druckfluid in den Arbeitsraum ein- und/oder ausgeleitet wird, wobei durch die Steuereinheit die Bewegung des Kolbens gesteuert wird.
摘要:
A positioning drive (3) for positioning tamping tines of a tamping unit (1) has the following features: a) an inner cylinder (10) of the vibration exciter (8) that is arranged coaxially with the cylinder axis (7) is mounted in an outer cylinder (12) so as to be displaceable via sliding surfaces (11) in an axial direction (7), b) an annular depression (13) is provided between two sliding surfaces (11) spaced from one another in the axial direction (7), c) a spacer ring (15) which subdivides the annular depression (13) into two fluid ducts (14) which are spaced from one another with respect to the axial direction (7) is optionally connected to the inner or the outer cylinder (10, 12), d) for vibration excitation, the two fluid ducts (14) can be alternately charged with hydraulic pressure by means of supply lines (16).
摘要:
The invention relates to a vibration damper (1) configured to be provided on a low frequency sound generator, which comprises a feeder unit (2) with a positive feedback system regulated by a reciprocating spring loaded piston (3) and a resonator tube (4). The vibration damper (1) may be positioned outside the resonator tube (4). The vibration damper (1) comprises a first flange (5) connected to the resonator tube (4), a number of springs (6), a second flange (7) and a number of weights (8).