Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1997-03-19
1998-11-17
Bonck, Rodney H.
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
74 44, 366114, 366116, 2093651, 198766, B06B 114, B65G 2732
Patent
active
058362045
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a balanced vibration generator for resonance-amplified operation of a machine or equipment; and a machine with an integrated vibration generator for resonance enhance operations.
Vibration generators are used in many places within industry where there is need for a well-defined, controlled vibration, e.g. for the operation of vibration troughs, vibration feeders, vibration screens etc.
The known vibration generators can be configured as a vibration motor, i.e. an electromotor with counterweights mounted on the axle journals, as a mechanical vibrator with axles being coupled together and having counterweights, said axles being driven by an external motor, or so-called electromagnetic vibrators where an electromagnet constitutes the driving aggregate in a natural-frequency system.
The known vibration generators are mounted on the object or the machine which is desired to be brought into oscillation. Normally, the machine is connected to a base by means of springs. With the known constructions, particularly with larger vibration machines, undesired vibrations are transferred through the machine support to the base, with consequent disadvantages for the surroundings and undesired loss of energy.
When constructing vibration machines in accordance with the so-called natural-frequency system, it is possible to a large extent to eliminate the transfer of undesired vibration from the machine to the base, while at the same time considerably reducing the energy requirements during operation.
Therefore, extensive efforts are made to configure vibration generators and vibration machines as natural-frequency systems, and the present invention therefore relates also to a natural-frequency system.
Natural-frequency systems are often built up in such a manner that two masses are connected to spring elements and are made counter-oscillatory during operation, whereby the energy periodically migrates from tensioned springs to masses in movement and back again to tensioned springs. A great advantage with natural-frequency systems is that only a modest supply of power is needed when the system has first been made to oscillate close to the resonant frequency. Moreover, it is known that by individual, elastic suspension of each of the counter-oscillating masses, the problems with the transfer of vibrations to the base can be reduced.
From DE publication no. 1.017.530 a method is known for the support of a natural-frequency machine whereby the centers of the two counter-oscillating masses lie on the so-called line of movement, where the two intermediate resonance springs are placed in such a manner in relation to the center of the total mass that each of the masses describes its own translatory movement in relation to the base, and where the elastic connection to the base in the shape of suspension springs is configured with spring constants which are proportional to the relevant mass.
From EP publication no. 512.261 there is known a so-called circular feeder with a vibration generator with counter-oscillating masses, and which is arranged so that the spring constant for the whole spring system can be changed by the adjustment of a handwheel. The springs are secured in a retaining mechanism which comprises a holder extending axially through the spring loops, and at each end comprises a handwheel for the adjustment of the overall length of the springs. It is hereby possible to adjust the resonant or natural frequency of the system. A possible imbalance from the point of view of weight can not immediately be removed by adjusting the mechanism, so that it is avoided that oscillation energy from an imbalance is led to the base or the like.
From U.S. Pat. No. 3,291,289 there is further known a vibrating conveyor where the counter-oscillating masses comprise a natural-frequency system, and where the counter-oscillating masses form a conveyor. All of the spring systems forming part of the vibration system are built up of two springs disposed in series, axially in relation to one anoth
REFERENCES:
patent: 3291289 (1966-12-01), Savage
patent: 4913281 (1990-04-01), Muller
Aktieselskabet Valdemar Skak Dansk Svingningsteknik
Bonck Rodney H.
Joyce William C.
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