Vibrating dewatering and spreading table
Vibrating de-watering and spreading tables are the first machines used in the sorting chain. They are used to drain the grapes, distribute them evenly and, in some cases, sift out particles smaller than the berries. Thanks to vibrations produced by two motors, the grapes are moved along an inclined stainless steel plate. These tables can also be used for manual sorting and include options such as magnetic sorting to remove metallic elements. They are designed for easy cleaning and comply with safety standards.
Draining and spreading vibrating table
Draining and spreading vibrating tables are the first element in the sorting chain. They have two or three functions, depending on the options:
They can also be used as a small manual sorting table, either before or after the destemmer, to complete the manual cleaning of the harvest.
- Draining the harvest before it goes into the destemmer or onto a manual sorting table.
- Spreading out the harvest before it passes over a manual sorting table.
- Selective sieving of particles smaller than the grape berries.
They can also be used as a small manual sorting table, either before or after the destemmer, to complete the manual cleaning of the harvest.
Diagram of a vibrating sorting, draining and spreading table
Operating principle
The operating principle consists of setting up an assembly in resonance by means of two motors rotating at an identical frequency. The amplitude of the vibration generated enables the grapes to be spread out and moved forward on a slightly inclined plate.The throughputs authorised by this technique, which is also used for reception bins, do not exceed 30 t/h.
The smallest models have a throughput of around 5 t/h.
The main factors
The main criteria to be taken into account areThe vibrating plate
Made of stainless steel, the fine perforations allow the juice to pass through. The vibrations allow the drained harvest to be conveyed to a linear or vibrating sorting table or any other harvest transfer device (conveyor belt, pump, etc.).
The juice collection tank
Vibration allows the grapes to be drained more efficiently than static draining.
The result is a material that is easy to sort, consisting only of solid parts.
The juice can be reincorporated into the pump before vatting to facilitate the transit of the harvest.
The result is a material that is easy to sort, consisting only of solid parts.
The juice can be reincorporated into the pump before vatting to facilitate the transit of the harvest.
Vibration frequency and motorisation
The draining and spreading plate is fixed to the chassis by several 'silentblocks' that absorb the vibrations created by the motorisation.The chassis remains stable on the work surface, with only the upper plate vibrating and setting the harvest in motion.
Draining and spreading the harvest
At the entrance to the table, there is an area for draining the harvest, comprising a spreading arm and a draining grid. The juice is collected in the pump located under the table and the destemmed harvest is guided towards the perforated vibrating plate.Magnetic sorting
To protect downstream equipment, one manufacturer offers a magnetic separator as an option. This consists of a magnetised bar located above the passage of the harvest, whose role is to retain the metallic elements present in the harvest.
Screening using adjustable bars
Recent models now incorporate adjustable bar sieving to eliminate some of the undesirable waste in the vatted harvest, such as petioles, millerandage berries and pips.A grid placed under the bars filters this waste, and the juice is collected under this grid in a box.
The bars can be adjusted to suitthe size of the particles to be rejected.