Combines gleaner rotor

[tbran]

The crop enters just as in a conventional combine. The crop is then directed to the left by stationary directional vanes call helical bars. These work like female threads . The cylinder bars also have the majority of the grooves and ridges all pointed in the same direction to assist crop flow. The discharge area works because there are paddles that push the material out the rectangular area and there is either a chopper or discharge impeller to finish powering out the material other than grain.

 

[Ed_Boysun]

If the light conditions in my storage building are favorable, I'll take some pictures this afternoon and see if they help explain the crop flow, thresh, and separation that occurs in a Gleaner rotary. Ed in Montana

 

[boetboer]

thanx alot! some pics would be helpful. this whole concept is very interesting. thanks again!

 

[boetboer]

okay, so the rotation of the drum forces the material into the "threads" which then basically spirals it out of the concave-areaIJ cool. so the crop moves only to one side, i.e. leftIJ or bothIJ and then, under the threshing systemIJ i saw auger-like things on the cutaway: do these spread the grain out over the sievesIJ if the crop only moves to one side, isn't the cleaning-area loaded unevenlyIJ

 

[boetboer]

oh yes, sorry: another thing: i already asked whether the crop enters from the front, which i assume it does. is this from the front+center of the threshing-unit or from one sideIJ pardon the (obvious) questions, but im amazed at how little i know of this seemingly great system. tell me, how does the fuel efficiency, grain quality and such things of these combines compare to other brands, conventional and rotaryIJ THANX guys!

 

[John_W]

The crop enters the right end of the rotor in a manner very similar to the crop entering a regular conventional threshing cylinder (drumIJ). The mat then rotates over the rotor and is forced sideways to the left by the helical bars on the cage and the grooves on the rotor bars. "Natural Flow" I think they used to call it.

 

[John_W]

You have it fairly well figured out. The distribution augers try to spread the grain and chaff evenly to prevent overloading the right side of the shoe. The accelerating rolls then throw or force the grain downwards at a high speed through a high speed blast of air that reduces the chaff loading of the shoe. laverda had a combine several years ago the used a similar to the Gleaner system. However, they had the rotor up front behind the header and then only elevated the grain and chaff to the shoe which was in the normal space. laverda used distrubution augers and acceleration rolls too. The straw was spit out near the left end of the header which was strange.

 

[D_Mayes]

The concaves are open so as soon as the crop starts entering the cylinder grain starts falling out.So most of the grain is realy on the right side and the rest of the cage is doing what the walkers and beaters use to in the older conventional combines.

 

[R_O_M]

I may need correction here, but the I believe the laverda design ie. rotor behind the header, was in the experimental design stage when Deutz bought the agricultural division of a basically bankrupt Allis Chalmers in the late 1980's. Fiat bought the industrial division. Deutz believed they had bought all the Allis combine designs but only discovered after the sale that the new down front rotor _ header system was actually owned by the industrial division of the old Allis Chalmers corporation which Fiat had bought. laverda was owned by Fiat hence that design turned up in a laverda experimental design!

 

[John_W]

I am sure the laverda rotaries were in production for at least a short time. They had two models, and they were big machines with around 300 horsepower engines. I used to have brochures on them that a friend picked up at the big ag show in Paris France. As soon as I saw them I thought this is the Gleaner design with a twist. This was in the Fiat-Agri days before all the buy outs. Although I think Fiat did own Hesston hay equipment in the US about that time. There are laveda combines again now in at least Italy.