Packed Agritechnica full of innovations CULTIVATION AND TECHNOLOGY MV 13 grades in silence The vibration frequency of the grading screens can be seamlessly adjusted, thanks to a plc frequency regulator. In the Grisnich stand, the new MV 13 precision grading system is humming almost in silence. This is strange for a machine that is a known noise-maker. Gerard Bos can make himself heard without any problem when he explains how it is that the renewed MV 13 can move its grading screens back and fort so silently. First of all, each grading screen is non-concentric, he explains. This means that there are fewer problems with maximum loading than with a concentric screen. The forces of the five grading screens are spread over a full circle of 360 degrees. Because the forces on each of the parts is low, there is not much wear-and-tear in this precision grader. The only things that need replacing every now and then are a few simple rubber dampers, which cost 2 euros each. These are the same basic rubbers as in the well-known Koni shock absorbers, said Bos. Another positive feature is the simple adjustment of the length of the stroke. Loosen the bolt, adjust, tighten the bolt, and two minutes later you’re ready. What is more, Bos calls the MV 13 the very best Spunta grader, the reason being that the vibration frequency of the grading screens can be seamlessly adjusted thanks to a plc frequency regulator. This has two advantages: the capacity increases and the damage is reduced. The maximum grading capacity of this machine is 30 tons per hour. This requires an investment of 35,000 euros, VAT excluded. WM complete with carrier potato harvester again You could say that WM Kartoffeltechnik is back to square one. The stand has the very first drawn carrier harvester by this German manufacturer on show, the first in this century that is. In the 1980s, WM, then known as Wühlmaus, also sold drawn carrier harvesters. These were popular with many farmers in Northern Europe. WM Kartoffeltechnik now hopes to return to that heyday with the introduction of the two-row 1650 L. The version for lifting will be placed straight behind and in line with the tractor. In both versions, the harvesters are long, have a large grading capacity, and are built on the frame of the now successful 8500 bunker lifter. Besides being long, the machine is also light. According to Richard Pubben, this was deliberately done to limit the soil pressure. Many potato growers are fed up with heavy machinery. They want to go back to the lighter lifters, but preferably with a large capacity. The new 1650 L combines this with an open construction, which makes the machine easily accessible for maintenance and repair. Partly due to the application of a portal axle, the machine is not kept free of dragging tare, which also keeps the weight within limits. The carrier potato harvester is expected to reach the market by the end of next year for a price of approx. 100,000 euros. Many potato growers are fed up with heavy machinery. Potato World 2012 • number 1 15 Pagina 14
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