A harrow/selvedge is agricultural equipment for cutting up lumps of earth after plowing and by course animals or tractors is pulled.
Originally the harrow/selvedge consisted of a tine stand, first of wood, later exclusively of steel (picture). Harrows/selvedges produce a relatively fine soil condition due to a large tine number and were beside the plow the chief work equipment of the farmer.
Today there is a large selection of harrow/selvedge types, depending upon operational area. Harrows/selvedges can in principle be differentiated into such, which of the tractor, which agricultural tractors are propelled by the power-takeoff and others, which are pulled only by the soil.
PTO operations are among other things the Kreiselegge or Kreiselgrubber, as well as the so-called shaking harrow/selvedge.
Harrows/selvedges without drive, thus pulled, and/or soil-propelled harrows/selvedges divided into tine harrows/selvedges and disk harrows.
To the tine harrows/selvedges the so-called rigid tine harrows/selvedges (as above in the picture) belong, as well as the feather/spring tooth harrows/selvedges (cultivators, or seed bed combination mentioned).
The disk harrow, also plate harrow/selvedge mentioned is a special form. Details for this, see below. To the disk harrows also still the spade roll harrow/selvedge belongs.
As the latter still special forms are to be called, like the Netzegge, the tumbling harrow/selvedge and the Wiesenegge.
The word syllable "egg" has the same origin as latin "more acer" for "sharply, cutting".
The Kreiselegge is agricultural equipment for cultivation, particularly to the Saatbettbereitung before the sowing.
The Kreiselegge is usually in the cultivation of three point connected with a tractor, which propels the equipment with the help of a drive shaft. The drive shaft leads to a Winkelgetriebe, which propels a multiplicity of gyroscopes, which are evenly in a row distributed on the tool carrier in distances from 25 cm or also 30 cm again depending upon work width. Each gyroscope is equipped over a vertical wave with a pair of tines, which is fastened to a tine owner. The tines or also gyroscope measurers mentioned, have a length of approx. 25 cm and to work as a function of the kind of fruit in different depth in the soil, which can be sown. The operating speed is with 6 - 10 km/h with approximately 350 - 420 rpm Kreisel.Die Kreiselegge in work widths by 2,5 m - 4.5 m in rigid design is offered, against what the larger work widths to 8 m for transport are hydraulically hinged. On the Kreiselegge also a triple steam engine can be developed, in order to reduce the separate SAE procedure to a processing step, which means a cost saving and a soil indulgence.
The Kreiselgrubber is a heavier variant of the Kreiselegge and consists of a particularly heavy framework with strengthened tines. Often Kreiselgrubber have a single tine stone safety device, with which the equipment can evade to heavy stones in the soil. The substantial technical difference of a Kreiselgrubbers to the Kreiselegge is that the tines do not work on sluggishly but stinging the soil (transmission runs into the opposite direction). There are also devices by a umschalbares transmission the two is. The name Kreiselgrubber for Kreiseleggen with "tines on grasp", which pull themselves into the soil inside and hold the desired operating depth automatically, is used as only manufacturers of AMAZONE.
The shaking harrow/selvedge consists of only 2 tine bars with rigid harrow/selvedge tines, similarly the rigid tine harrow/selvedge, as above in the picture. The two harrow/selvedge bars are brought by a tumbling drive in lateral motion moving in opposite directions by for instance 10cm, whereby this equipment produces a effect similarly for the Kreiselegge. Shaking harrows/selvedges are substantially easier than Kreiseleggen.
The disk harrow (also plate harrow/selvedge called) consists of curved disks, which cut open and mix inclined/slanted rotary the soil similarly the plow. Usually 2 disk bars moving in opposite directions co-operate, in order to cut the whole soil horizon. It offers the advantage to bring so-called loss grain faster to germinating in order to accelerate an accumulating from seeds fallen out when threshing to.
The spade roll harrow/selvedge (also wing harrow/selvedge called) is an easier variant that disk harrow they possesses instead of the disks only individual "spades", quasi disk segments, which only anritzen the soil.
All modern propelled harrows/selvedges have usually a directly installed roller as support, depth guidance and for back solidification.
Sorbi vernacular: Who geeggt with the cat, knows, how she pulls.
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