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The grading machine, based on the shaking system, is driven by a three-phase motor equipped with a frequency converter and an electronic controller. This drive ensures that the screening boxes with removable screens make alternating movements. During the high shaking speed, the product will be transported over the riddles. While at the slow shaking speed, the product is allowed to fall through the riddles. With the stop option, the rocking movement is briefly stopped. In this way an optimal separation can be made in the product. The steel or rubberized riddles consist of two parts. After unlocking a clamp construction, the riddles can be slid sideways out or into the riddle boxes. Depending on the chosen version, this can be on the left or right side of the grading machine. Product (especially elongated potatoes) that has gotten into the riddles is pushed upwards by the two riddle cleaners.
| Model | BSM 2116/4 | BSM 2116/5 |
| Capacity | up to 50 tons / hour | up to 50 tons / hour |
| Number of riddle decks | 4 | 5 |
| Riddle dimensions | 1,600 x 1,050 mm | 1,600 x 1,050 mm |
| Riddles per deck | 2 | 2 |
| Machine length | 4,170 mm | 4,170 mm |
| Machine width | 2,240 mm | 2,240 mm |
| Shaking mechanism drive | 3.0 kW | 3.0 kW |
| Screen cleaner drive | 0.37 kW | 0.37 kW |
| Weight | 3,000 kg | 3,000 kg |
