CONCAVE Russian patent published in 2012 - IPC A01F12/24 

FIELD: agriculture.

SUBSTANCE: invention relates to the agricultural industry and may be used to improve the design of the threshing machine of harvesters. The concave consists of a rigid grid made according to the radius and covering the bottom of the drum. The middle part of the concave consists of several rows of curved bars of rectangular cross section. The bars are rigidly fixed on the axes mounted in the side planks of the thresher with the possibility of their rotation by pneumatic or hydraulic cylinders, each of which sets in motion a half of planks. On the lateral surfaces of the planks the rectangular pins are rigidly attached at right angles to them with an equal spacing. In the middle of the concave flush with the side planks the plate is rigidly fixed with a cross-section in the form of an isosceles triangle. The planks of the concave have corresponding triangular grooves with the ability of their entrance to a specified plank.

EFFECT: claimed implementation of the concave enables to reduce the time of its cleaning when clogging, and thereby to improve the performance of the harvester.

5 dwg