SU1521336A1 - Centrifugal working member for spreading fertilizers - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to agricultural machinery. The purpose of the invention is to increase the operational reliability of the working body. The centrifugal working body includes a disk 1 with blades 2 grooved profile. The working edge 3 of each blade is pointed in the form of a dihedral angle β, the upper face 4 of which forms an acute angle α with the horizontal. The angle β of the sharpening of the working edge is made increasing towards the periphery of the disc. 4 il.

Description

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The invention relates to agricultural machinery, in particular to fertilizer spreaders with centrifugal discs.

The purpose of the invention is to increase the operational reliability of the working body.

FIG. 1 schematically shows the proposed working body, top view; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. I.

The tool includes a disk 1 with blades 2 of the grooved profile installed on it. Each blade 2 in the upper part has a tapering of the working edge 3 in the form of a dihedral acute angle p. Top 4, the face of the angle p forms with the horizontal 5 an acute angle a. The angle p is made increasing along the edge 3 of the blade 2 in the direction from the center of the disk 1 to its periphery due to a decrease in the angle a, i.e. due to the fact that, since (cti + pi) () (af P): The limiting value of the angle a can be determined by the formula

a arctg (v ,, / ve),

where Vn is the speed of fertilizers fed to the disk, m / s;

Ve is the circumferential velocity of the edge point 3 of the blade 2, for which the value of a, m / s is determined.

The working body works as follows.

When the disk i rotates, the fertilizers fed to the working member are divided into portions by the sharp edges of the 3 blades 2. Each portion of the fertilizers, moving under the action of centrifugal forces along the groove of the blades 2, flies from its end and is distributed throughout the field. At the same time, the reflection of fertilizers in the place of their supply to the working member is minimal, since each blade 2 in the upper part has an edge 3, and the upper side 4 of the angle p forms

-t1

with horizontal 5 acute angle a. The value of the angle a is chosen from the condition that the fertilizers are not reflected when feeding them to the centrifugal tool.

from the top side of the 4 corner p.

Edge 3 areas located at unequal distances from the center O of disk 1 experience various shock loads from meeting fertilizers fed to the centrifugal working body: they are the smallest near the center O of disk 1, and at their periphery maximum. It has been established that for a centrifugal working body intended for sowing mineral fertilizers, the maximum value of the sum of the angles a and p should not exceed 35 °. Otherwise, there is an increase in the mass fraction of fertilizers, reflected from the lower side of the angle p of the sharpening point.

Increasing the angle of sharpening of the working edges of the blades at the periphery of the disc, i.e., where the edges are most worn out, provides stabilization of the sieving width of fertilizers with a high quality of their application. In addition, the working

time to sharpen the upper edges of the blades, which facilitates the maintenance of the machine and improves its performance.

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Claims (1)

Invention Formula A centrifugal working device for spreading fertilizers, a swiveling blade disc with a grooved profile with a pointed working edge in the form of a sharp dihedral angle, the upper face of which forms an acute angle with the horizontal, characterized by the increasing angle of the working blade edge. along the KpOMKi blade to the periphery of the disk. (pus.i (rig.E 8 in srigL