Vibrating tables and vibrating table systems are made up of various components such as drives and controls. Here you will find general technical information, a brief summary of the components and an explanation of the theoretical operating principles.
To generate the desired vibration of the vibrating table plate, electric or pneumatic drives are available, which can be individually adapted for vibration generation depending on the application.
There are two main types of drives available for generating the desired motion. In addition to piston vibrators, which usually generate a linear vibration, the use of unbalance motors for vibration generation has proven successful. With the help of the unbalance drives, it is possible to generate both linear and radial vibrations, depending on the arrangement. Compared to piston vibrators, unbalanced vibrators have a much higher power limit, which favors their use in large, heavy-duty applications.
The following is decisive for the choice of the drive system:
- the basic requirements of the application (for example, compaction of concrete or bulk material, test table for components)
- the operating conditions (such as ATEX classification)
- the general conditions (for example, availability of air for the use of a pneumatic drive)
Basically, the use of pneumatic drives is limited by the moving mass. Pneumatic drives are used in areas with low masses; here, the mass including the vibrating table plate must be taken into account. This is due to the significantly lower power density of pneumatic vibration motors in relation to electric drives. Due to their high power density, the electric vibration motors cover a wider range of applications.
General technical information can be obtained from our product portfolio for use on vibrating tables or vibrating systems:
- Electric vibrator or unbalance motor
- Turbine vibrator
- Ball vibrator
- Roller vibrator
In vibration technology, different drives can be used to generate different types of vibrations. Basically, there are two types of vibrations used in vibration technology:
Circular motion of the vibrating table plate
Circular vibrations are generated by the use of individual unbalance motors. Here, configurations in which an opposing arrangement of the unbalance drives is necessary (for example, to generate a linear vibration) are not used. The drives are used to generate a periodic, usually medium- to high-frequency, sinusoidal oscillation with a small amplitude. By using the sinusoidal vibration, it is possible to realize conveying systems, screening systems as well as systems for the compaction of certain materials.
Linear movement of the vibrating table plate
Linear vibration is mainly used in conveying and compaction technology. With the aid of suitable drives, this form of vibration is used for the targeted conveying or compaction of bulk materials. Pneumatic piston vibrators or electric unbalance motors, for example, are used as drives.
When using rotating unbalance motors, a linear movement of the vibrating table plate is achieved by mounting at least two unbalance motors in pairs. These are operated in opposite directions. The unbalance forces generated by the two motors add up perpendicular to the mounting plane. In the plane, the forces balance each other out due to the counter-rotation of the motors. This results in a purely linear movement of the plate.
This functional principle is also used for targeted directional vibrations, for example in trough, pipe or spiral conveyor systems. It can also be used to specify the direction of stress during component testing.