Silo discharge problems, a thing of the past
The storage of large quantities of bulk product often leads to the use of large diameter circular storage silos, a rational and economic solution. However though it is easy to fill such a silo it is quite another matter to empty it especially where the storing of fine, cohesive or oily products are concerned and the silo cannot be emptied by opening a simple slide.
For such situations, and where the traditional methods of extraction by multi screw, vibrators or fluidised bottoms prove ineffective, the MORILLON HYDRASCREW planetary discharger offers a more than adequate solution.
The HYDRASCREW is designed to bottom unload circular silos by means of a rotating screw revolving 360 deg. around a central pivot point in the silo base through which the product is discharged into a collecting conveyor or in the case of bulk out loading direct to an IBC or bulk vehicle.
Available in ten models to suit silos from 2.00 m diameter up to 20.00 m diameter with fixed (or variable) discharge rates from 1 to 500 cu/m an hour the HYDRASCREW is capable of discharging a variety of diverse raw materials such as coal, sludge, woodchips, oilseed meal, chemicals, plastic chips, limestone, fly ash, animal and human foodstuffs.
Ideal as a "Bridge breaker" the HYDRASCREW through its planetary action undermines the stored product ensuring the product is discharged on a "first in first out" basis. In applications where the product proves particularly stubborn to move and can become consolidated in the silo, a toothed screw along with the MORILLON patented "booster" unit is incorporated in the system. In the event of overload caused by stubborn to move product, the "booster" will automatically stop both screw rotation and planetary motion and cause a secondary hydraulic cylinder (applying 10 to 15 times normal torque) to ratchet the screw around until the obstruction has been removed after which normal rotary and planetary motion will automatically restart.
The HYDRASCREW is powered by a single hydraulic power pack which ensures the unit is capable of dealing with heavy duty applications. Silos with loads as little as 500 kg of flaked plastic film and as much as 6000 tonnes of fly ash have been successfully discharged by a single HYDRASCREW. If a number of units are installed in a storage complex it is possible to drive these from a single power-pack provided the silos are not required to be discharged simultaneously.
Although the HYDRASCREW was originally designed as a mean of discharging non free flowing materials from large volume circular flat bottomed silos, numerous other applications have since been found for the unit, such as, among others, dosing or feeding units, as shown on the figures annexed.
Moreover, in all the cases, the HYDRASCREW will act as a bridge breaker, will avoid the formation of chimney appearing during gravitary emptying, and will homogenize the product as illustrated by the drawings hereafter. Such an installation in a flat bottomed silo offers in addition to these advantages, an increased storage capacity.
Click here for a diagram of the hydrascrew.
Click here for the standard sketch.