New Technology, New Benefits
The Skiold mill is the fruit of several years of research and development. The goal was to find a single mill that was capable of grind all types of cereal, with a low energy consumption, and low noise and dust emissions. During processing, the mill had to be able to vary the particle size of the ground product automatically based on the type of blend required for the various species of animals. In addition there was the goal of creating a compact mill that was easy to install even in already existing systems.
The SKIOLD disc mill satisfies all these requirements, and the quality and reliability make the SKIOLD mill the best solution for all the requirements of many farms and feed industries.
The grinding occurs between 2 opposite discs equipped with tungsten carbide plates, the same material used to produce cutting tools for the industry. The quality and excellent production offered by the SKIOLD disc mill meets all the requirements of the very largest feed producers and breeders.
High Productivity, Low Power Consumption
The mill is available in 4 models.
The SK2500 with 5.5 kW or 7.5 kW electric motor; the SK5000 with 15 – 22 – 30 kW electric motor; the SK10T with 55 kW or 75 kW electric motor and finally the SK780 with 160 kW or 200 kW electric motor.
When you grind grain, production ranges from 1000 to 12,000 kg/h depending on the size of the mill and the particle size of the ground product. The average power consumption is only 5 kWh per tonne. The engine is mounted directly on the rotating disc, thus leveraging the full power for the milling process. Production varies depending on the different types of cereals and of particle size desired.
Exceptional Duration of Consumable Parts
The grinding takes place in 2 phases: The cereal is sent at the centre between the two discs and passes through a first pair of rings by centrifugal force which causes the first break of the product. The final grinding takes place between the pair of outer discs. The discs consist of a number of plates with a hardness of 1700HV, while the hardness of a hammer on a traditional mill is just 600HV after hardening treatment. In normal milling conditions, with clean grain, the service life of a set of discs on a smaller mill is above 5000 tonnes, 10,000 tonnes for an average size mill and greater than 20,000 tonnes for the largest model, thus increasing the time intervals between maintenance considerably.
Reduced Dust and Low Noise Level
The grinding occurs without ventilation, this reducing dust emissions. The screw conveyors, elevators or other types of mechanical transport are used to convey the material to and from the mill. CA.RE.DI. SRL is able to provide all these various types of transport. The noise level perceived by the operator is only 80 dB(A), when in a traditional mill, it is 85- 90 dB(A).
The Ground Product
The ideal product is not the same for all animal species or groups within the same species, and therefore different degrees of grinding are required for different types of cereals. It is therefore important to be able to change the particle size even during processing to reach the optimum grind.
The distance between the two grinding disks determines the particle size and the disc mill was built in order to vary the distance between the disks in a simple and effective way. The distance can be changed manually by means of a handle located in the front of the mill or automatically by means of an actuator that receives the command from the plant control system (optional).
Installation and Use
Thanks to its compact form, the mill is easily installable in both new and existing plants. Generally speaking, screw conveyors are used to convey the grain to the mill. Using an inverter in the feed auger ensures optimal supply to the mill. A screw conveyor or other type of transport can be mounted directly to the outlet of the mill in order to convey the ground product to the mixer or the silo.
If the grain contains impurities which increase the wear of the parts, a pre-cleaning is recommended using a vibrating screen. Ca.Re.Di. SRL is able to provide the right vibrating screen required to separate both dust and large impurities from the grain before grinding. As a standard accessory the mill is equipped with a magnetic separator.
The disc mill is ideal for all the most common types of plants, both for pre-milling and for continuous grinding or for the production of “broken” pieces. The mill has been tested and found suitable to grind different types of grains including pellets with a diameter of up to 12 mm.