RU1789304C - Drive of grain cleaning device of grain combine - Google Patents

Abstract

The invention relates to agricultural machinery, in particular to the design of a grain cleaning device for a combine harvester. The purpose of the invention is to reduce grain losses during harvesting of various crops. The goal is achieved by the fact that the connecting rods 12 of the crankshaft 1 are coupled with two-arm cleaning levers 2 with the possibility of changing the position of the connecting rods 12 relative to the middle support 3 of the levers 2, which provides a change in the amplitude of oscillations of the two-arm levers 2 and the associated transport board 4 and sieve mills 5 and 9. In this case, the ends of the connecting rods 12 associated with the levers 2 have axles 13 and rubber bushings 14 mounted on them, and the two-arm levers 2 in their upper part are made with semi-cylindrical recesses 15 and are equipped with any recess secured in the zone approx. 15, the corresponding semi-cylindrical cover 16. The center of curvature of the recess 15 coincides with the center of rotation of the crankshaft 1. 3 ill.

Description

Figs

FIELD OF THE INVENTION This invention relates to agricultural machinery, in particular to a design for cleaning a combine harvester.

The purpose of the invention is to reduce grain losses during harvesting of various crops by changing the amplitude of oscillations of the transport board and sieve mills.

In FIG. 1 is a schematic side view of a drive of a grain cleaning device of a combine harvester; in FIG. 2 - node I in FIG. 1; in FIG. 3 is a section AA in FIG. 2.

The drive of the grain-cleaning device of the combine harvester comprises a crank mechanism with a crankshaft 1 pivotally attached to the frame of the combine (not shown), two-arm levers 2, pivotally mounted by a middle support 3 on the frame of the combine, a transport board 4 and an upper sieve mill 5, pivotally attached to the upper ends two-arm levers 2 through the axis 6 and mounted on the suspensions 7 and 8, the lower sieve mill 9 attached to the lower ends of the two-arm levers using the axis 10 and mounted on the suspensions 11, and the connecting rods 12, articulated binding crankshaft 1 to the upper ends of two-armed levers 2, wherein the connection of each connecting rod with two- lever arm accomplished by provided at the end of the connecting rod 13 and axis ballpen thereon rubber sleeve 14 with its locking elements against axial displacement (not designated). Two shoulders levers 2 in the upper part are made with semi-cylindrical recesses 15 and are equipped with a semi-cylindrical cover 1 b fixed in the zone of any of the recesses, which forms together with the recess

a cylindrical socket for the sleeve 14. To ensure that the initial angular position of the two-arm levers 2 and the suspensions, 8 and 11 remains unchanged, when the ends of the connecting rods 12 are moved from one socket to another, the centers of the recesses 15 are located on an arc of a circle with a center coinciding with the center of rotation of the crankshaft 1.

The drive operates as follows. When the crankshaft 1 is rotated, the connecting rods 12 act on the upper ends of the two-arm levers 2 through the recesses 15 with the help of the axles 13 and the rubber bushings 14 secured in the recesses by the covers 16. As a result, the levers 2 vibrate around the middle support 3 and transmit the vibrations to the transport board 4 and upper sieve mill 5 installed

on the suspensions 7 and 8, and through the axis 10 to the lower sieve mill 9 mounted on the suspensions 11. If necessary, change the oscillation amplitude of the transport board 4 and sieve mills 5 and 9 of the axis 13 s

the rubber bushings 14 are moved to the corresponding recess 15 of the two-arm levers 2, for which the covers 16 are removed, and then, after the rearrangement, they are again fixed at the places where the connecting rods and levers meet.

Thus, the implementation of the grain cleaning device of the combine with the ability to control the amplitude of the vibrations of the transport board and sieve

mills allows you to choose the most optimal variant of the impact of cleaning units on the heap being cleaned, which reduces grain loss immediately from sieves when harvesting a wide variety of crops, including seed plants

herbs.

Claims (1)

SUMMARY OF THE INVENTION A drive of a grain-cleaning device of a combine harvester comprising a crank mechanism with a crankshaft pivotally attached to the frame of the combine, two-arm levers pivotally mounted on the frame and pivotally connected by the ends of the upper arms with the transport board and the upper sieve mill mounted on the suspensions, and the ends with the lower sieve mill, and with connecting rods pivotally connecting the crankshaft with two-arm levers, characterized in that, in order to reduce grain losses during harvesting, p different cultures by changing the amplitude of oscillations of the transport board and sieve mills, each two-arm lever is made with semi-cylindrical recesses and is equipped with any recess secured in the zone the corresponding semi-cylindrical cover, while the centers of the recesses are located on an arc of a circle with a center coinciding with the center of rotation of the crankshaft, and the connection of each connecting rod with a two-shoulder lever is carried out by means of an axis provided at the end of the connecting rod and a rubber sleeve placed on it, placed in a cylindrical socket formed by a recess and a cover. Fi g. 2